Display device

Abstract

Disclosed herein is a display device, including: a display panel having a display area having a plurality of pixels each composed of one or more sub-pixels, a first image and a second image being alternately displayed adjacent to each other in the sub-pixels, the first image and the second image being displayed in visual directions different from each other so as to be adapted to be discriminated from each other; and a crosstalk correcting portion having a crosstalk correcting table, configured to carry out crosstalk correction for images different from one another by using the crosstalk correcting table; wherein the display area is divided into a plurality of areas, and gamma correction which differs so as to correspond to the plurality of areas obtained through the division, respectively, is carried out for an image as an object of the crosstalk correction.

Claims

1. A display device, comprising: display panel having a display area having a plurality of pixels that are disposed in a matrix and each are composed of one or more sub-pixels, wherein the display area is divided into a plurality of division areas, at least one of the division areas is non-rectangular and includes a plurality of extending portions, a shape of a border of at least one of the division areas is zigzag.

2. The display device according to claim 1, wherein a gamma correction which differs so as to correspond to the division areas, respectively, is carried out for an image.

3. The display device according to claim 2, wherein a first image and a second image being alternately displayed adjacent to each other in the sub-pixels, the first image and the second image being displayed in visual directions different from each other so as to be adapted to be discriminated from each other.

4. The display device according to claim 2, wherein the gamma correction is carried out for the image as an object of a cross talk correction, the display device further comprising crosstalk correcting portion having a crosstalk correcting table, configured to carry out the crosstalk correction for images different from one another by using the crosstalk correcting table, and the crosstalk correcting table is composed of a plurality of crosstalk correcting tables corresponding to the plurality of the division areas, respectively.

5. The display device according to claim 4, wherein the crosstalk correcting portion carries out the crosstalk correction of K (K is an integral number) gradations for N1 (N1 is a positive integral number of smaller than N) in N (N is a positive integral number of equal to or larger than 2) frames, and carries out the crosstalk correction of the (K+1) gradations for the (NN1) frames.

6. The display device according to claim 3, wherein the display panel includes slits of a light blocking layer with which the first image and the second image are made to be adapted to be discriminated from each other in different visual directions, respectively.

7. The display device according to claim 4, wherein the crosstalk correcting table contains correction data corresponding to gradations of object sub-pixels each as an object of the correction, and gradations of first adjacent sub-pixels that are adjacent to the object sub-pixels.

8. The display device according to claim 4, wherein the one pixel is composed of sub-pixels having colors different from one another, and the crosstalk correcting table contains therein data corresponding to gradations of the object sub-pixels each as an object of the correction, and gradations of second adjacent sub-pixels that are adjacent to the object sub-pixels and have the same color as the object sub-pixels.

9. The display device according to claim 7, wherein the crosstalk correcting table has a white reference, and correction data is zero when each of the gradations of the first adjacent sub-pixels is the 63-th gradation corresponding to white.

10. The display device according to claim 8, wherein the crosstalk correcting table has a white reference, and correction data is zero when each of the gradations of the second adjacent sub-pixels is the 63-th gradation corresponding to white.

11. The display device according to claim 7, wherein the crosstalk correcting table has an auto-reference that refers to a state independent on other sub-pixels than the object sub-pixels, and correction data is zero when the gradations of the object sub-pixels and the first adjacent subpixels are equal.

12. The display device according to claim 8, wherein the crosstalk correcting table has an auto-reference that refers to a state independent on other sub-pixels than the object sub-pixels, and correction data is zero when each of the gradations of the second adjacent sub-pixels is the 0-th gradation corresponding to black with no light leakage.

13. The display device according to claim 7, wherein the crosstalk correcting table has a black reference, and correction data is zero when each of the gradations of the first adjacent sub-pixels is the 0-th gradation corresponding to black.

14. The display device according to claim 8, wherein the crosstalk correcting table has a black reference, and the correction data is zero when each of the gradations of the second adjacent sub-pixels is the 0-th gradation corresponding to black.

Description

BRIEF DESCRIPTION OF THE FIGURES

(1) FIG. 1 is a diagram showing disposition of pixels in a liquid crystal display panel;

(2) FIG. 2 is a diagram showing synthesis of two pictures;

(3) FIGS. 3A and 3B are respectively a cross sectional view showing the principle of image separation of two pictures, and a top plan view showing a light blocking pattern of a light blocking layer;

(4) FIGS. 4A and 4B are respectively a top plan view showing generation of crosstalk, and a cross sectional view showing the generation of the crosstalk;

(5) FIG. 5 is a block diagram showing an outline of a display device of the present application;

(6) FIG. 6 is a top plan view showing division of a display area;

(7) FIGS. 7A and 7B are respectively a block diagram showing an outline of a crosstalk correcting portion in a display device according to a first embodiment, and a block diagram showing an outline of a crosstalk correcting portion in a display device according to a second embodiment;

(8) FIGS. 8A to 8C are respectively a diagram showing an LUT having an auto-reference, a diagram showing an LUT having a white reference, and a diagram showing an LUT having a black reference;

(9) FIGS. 9A and 9B are respectively a diagram showing an example of disposition of sub-pixels based on an FRC with four frames as one cycle and a table showing correction values for the sub-pixels of the FRC shown in FIG. 9A;

(10) FIG. 10 is a graph showing a gamma correction; and

(11) FIGS. 11A and 11B are respectively a diagram showing visual angle deviation of a position shifted from a center on a display area, and a graph explaining the visual angle deviation shown in FIG. 11A.

DETAILED DESCRIPTION

First Embodiment

(12) Although the preferred embodiments of the present application will be described in detail hereinafter with reference to the accompanying drawings, the preferred embodiments which will be shown below are not intended to limit the present application to the description. Thus, the present application can be equally applied to various kinds of changes which are made without departing from the technical idea shown in the appended claims. It is noted that in the drawings used for the descriptions in this specification, for the purpose of making layers and members have such sizes that they can be recognized on the drawings, the scale size is shown so as to be made to differ every layer and member, and thus is not necessarily shown in proportion to the actual size.

(13) A display device 10 according to a first embodiment is a display device for displaying a navigation image and a DVD-reproduced image in a driver's seat direction and in a passenger seat direction so as to allow the navigation image and the DVD-reproduced image to be discriminated from each other. Firstly, a structure of a display area 12 of a liquid crystal display panel 11 of the display device 10 will be described below. FIG. 1 is a diagram showing pixels in the display area 12. The display area 12 is composes of 1,440 pixels in an extension direction (in a transverse direction) of each of scanning lines (not shown), and 540 pixels in an extension direction (in a longitudinal direction) of each of signal lines (not shown). One pixel is composed of three sub-pixels of R(red), G(green) and B(blue) which are transversely disposed, and has approximately a square shape. Also, a color of one pixel is a mixed color of R, G and B of the sub-pixels. As shown in FIG. 2, an image displayed on the display area 12 is a synthetic image obtained by sorting out a first image displayed in the driver's seat direction in a car with the steering wheel on the right side, and a second image displayed in the passenger seat direction in the car with the steering wheel on the right side in units of sub-pixels in a checkered pattern (a black and white pattern in a chess).

(14) As shown in FIG. 3A, a light blocking barrier 13 is deposited on a display surface side in the liquid crystal display panel 11. Also, as shown in FIG. 3B, a light blocking pattern of a checkered pattern-like slits 14 is formed in the light blocking barrier 13. As shown in FIG. 3A, with regard to the sub-pixels of the first image, and the sub-pixels of the second image, the first image and the second image being alternately displayed adjacent to each other, in the driver's seat direction, the second image cannot be usually recognized, but only the first image is visually recognized. On the other hand, in the passenger seat direction, the first image cannot be visually recognized, but only the second image is visually recognized. For example, in the driver's seat direction, only the navigation picture is visually recognized, and in the passenger seat direction, only the DVD picture is visually recognized. The light blocking barrier 13 is formed in such a way that the luminance of the first image, and the luminance of the second image each become highest when the driver's seat direction and the passenger seat direction correspond to angles which are inclined in a counterclockwise fashion and in a clockwise fashion by 30 with respect to a perpendicular line to the display surface of the liquid crystal display panel 11, respectively.

(15) In the synthetic image in which different images are adjacent to one another as shown in FIG. 2, the voltages corresponding to different gradations are applied to the adjacent sub-pixels, respectively, in many cases as compared with the case of the images not synthesized. When the voltages corresponding to different gradations are applied to the adjacent sub-pixels, respectively, the electrical crosstalk becomes easy to generate. With regard to the cause of the electrical crosstalk, it is thought that the spike which is generated along with the switching of the voltage of the scanning line fluctuates an effective value of the voltage being applied to the pixel. For example, as shown in FIG. 4A, when in an image in left-hand side visual direction, a center of a halftone gray background is black, and an image in the right-hand side visual direction is halftone gray solid, the center of the image in the right-hand side visual direction is displayed so as to be colored with the slightly deep halftone gray because a voltage in the center of the image in the right-hand side visual direction is fluctuated by the electrical crosstalk (indicated by E-XT of FIG. 4B). The electrical crosstalk is generated when the gradations of the adjacent sub-pixels are different from each other in addition to the case of the synthetic image described above. In particular, since the sub-pixels of the different images are adjacent to each other in the synthetic image, the very large crosstalk is generated. For this reason, in the display device 10, the electrical crosstalk needs to be corrected. In addition, as shown in FIG. 4B, a light is diffracted in a slit 14 of the light blocking barrier 13, and thus lights leak from the sub-pixels, having the same color, in the adjacent pixels. This optical crosstalk (indicated by O-XT of FIG. 4B) also needs to be corrected.

(16) FIG. 5 is a block diagram showing the display device 10 including a crosstalk correcting portion for correcting both the electrical crosstalk and the optical crosstalk. The display device 10 includes a navigation portion 15, a DVD reproducing portion 16, a selecting portion 17, a two-picture synthesizing portion 18, an EEPROM 19, an EEPROM controller 20, a crosstalk correcting portion 21, an output signal creating portion 22, and a liquid crystal display portion 23. The navigation portion 15 outputs a navigation image before being synthesized, and the DVD reproducing portion 16 outputs a DVD-reproduced image before being synthesized. The selecting portion 17 selects either the navigation image outputted from the navigation portion 15 or the DVD-reproduced image outputted from the DVD reproducing portion 16 as the first image before being synthesized as shown in FIG. 2. Also, the selecting portion 17 selects either the navigation image outputted from the navigation portion 15 or the DVD-reproduced image outputted from the DVD reproducing portion 16 as the second image. For example, while the vehicle is stopped, the selecting portion selects the DVD-reproduced image as the second image as well as the first image, and while the vehicle is traveled, the selecting portion 17 selects the navigation image as the first image, and selects the DVD-reproduced image as the second image.

(17) The two-picture synthesizing portion 18 sorts out the first image and the second image both selected by the selecting portion 17 in the checkered pattern as shown in FIG. 2, thereby synthesizing both the first image and the second image. Electrical correction tables of R, G and B, and optical correction tables of R, G and B are stored in the EEPROM 19. Electrical correction data on the gradations of all the adjacent sub-pixels for all the gradations of the sub-pixels each as an object of correction is stored in the electrical correction tables. Also, optical correction data on all the gradations of the sub-pixels, having the same color, in the adjacent pixels for all the gradations of the sub-pixels each as an object of the correction is stored in the optical correction tables. The correction data is values obtained from the experiments. The EEPROM controller 20 controls an operation for inputting/outputting the correction data to/from the EEPROM 19. The crosstalk correcting portion 21 carries out the crosstalk corrections by using the various kinds of LUTs. The output signal creating portion 22 controls a polarity and a timing for the signals which have been corrected in the crosstalk correcting portion 21 so that the signals which have been corrected in the crosstalk correcting portion 21 can be displayed in the form of the image corresponding thereto on the liquid crystal display portion 23. The liquid crystal display portion 23 includes a liquid crystal display panel 11, and a backlight, a gate driver, and a source driver (each not shown), and the like. In this case, the liquid crystal display panel 11 includes a light blocking barrier, displays thereon the synthetic image, and allows the first image and the second image to be discriminated from each other in the different visual directions, respectively. Also, the liquid crystal display portion 23 displays the data of R, G and B from the output signal creating portion 22 in the form of an image corresponding thereto in the internal liquid crystal display panel 11.

(18) FIG. 7A is a detailed block diagram of the crosstalk correcting portion 21A. The crosstalk correcting portion 21A includes a preprocessing portion 24, an R processing circuit 25, a G processing circuit 26, and a B processing circuit 27. The preprocessing portion 24 sends necessary data among the synthetic image which is sent from the two-picture synthesizing portion 18 to the R processing circuit 25, the G processing circuit 26, and the B processing circuit 27 synchronously with a synchronous signal. The R processing circuit 25, the G processing circuit 26, and the B processing circuit 27 carry out the crosstalk corrections for the data of R, G and B, respectively.

(19) Firstly, a description will be given with respect to division for the display area 12, and the LUT for carrying out the crosstalk correction. As shown in FIGS. 11A and 11B, the visual angle differs depending on the positions on the display area 12. Therefore, not only the crosstalk due to the adjacent sub-pixels, but also the crosstalk due to the sub-pixels, having the same color, in the adjacent pixels differ in amount of crosstalk thereof depending on the positions on the display area. For this reason, in the first embodiment, as shown in FIG. 6, the display area 12 is divided into 12 parts, i.e., division areas D1 to D12, and gamma corrections corresponding to the division areas D1 to D12, respectively, are carried out. The division is carried out in units of pixels, and a delimiter of 120 pixels which are obtained by dividing 1,440 pixels in the transverse direction as the extension direction of each of the scanning lines into 12 parts is set as a reference line B for the division. If the division is carried out with the reference line B, it is feared that a difference between the luminances due to the difference between the gamma corrections for the right-hand and left-hand sides of the reference line B appears in the form of a straight line. In order to cope with this situation, in the first embodiment, the boundary lines are made not to be clearly understandable in such a way that each of the boundary lines among the division areas D1 to D12 does not become a straight line, that is, each of the shapes of the division areas D1 to D12 does not become rectangular. Specifically, as shown in FIG. 6, each of the boundary lines is made zigzag with the reference line B approximately as a center. Although an enlarged diagram is shown only between the division areas D1 and D2 in FIG. 6, the boundary lines among other division areas D2 to D12 are each similarly zigzag. It is noted that a position of the zigzag is gradually changed by an FRC which will be described later, thereby making it also possible to further have difficulty seeing.

(20) Gradation data on the sub-pixel in the first embodiment is 6 bits of a normal black mode, and each of the luminances of R, G and B becomes 64 kinds from 0-th gradation to 63-th gradation. In addition, the display device 10 of the first embodiment has the normal black mode, and thus the 0-th gradation corresponds to black, and the 63-th gradation corresponds to white. Then, the electrical LUT as the correction table for the electrical crosstalk is a table of correction values which are obtained based on the 0-th to 63-th gradations of the sub-pixels each as an object of the correction, and the 0-th to 63-th gradations of the adjacent sub-pixels on the right-hand side of those sub-pixels. The optical LUT as the correction table for the optical crosstalk is a table of correction values which are obtained based on the 0-th to 63-th gradations of the sub-pixels each as an object of the correction, and the 0-th to 63-th gradations of the sub-pixels, having the same color, in the adjacent pixels on the right-hand side thereof.

(21) A plurality kind of electrical LUTs and optical LUTs are provided depending on the position where the reference of the gradation with which the correction data is made zero is set. For example, FIG. 8A shows the electrical LUT and the optical LUT each having a white reference. In this case, in the electrical LUT, the correction data is made zero when each of the gradations of the adjacent sub-pixels is the 63-th gradation corresponding to white, and in the optical LUT, the correction data is made zero when each of the gradations of the sub-pixels, having the same color, in the adjacent pixels on the right-hand side is the 63-th gradation corresponding to white. FIG. 8B shows the electrical LUT and the optical LUT each having an auto-reference in which a state not influenced from any of other sub-pixels is made another reference. In this case, in the electrical LUT, the correction value is made zero when both the gradations are equal to each other, and in the optical LUT, the correction data is made zero when each of the gradations of the sub-pixels, having the same color, in the adjacent pixels is the 0-th gradation corresponding to black free from the light leakage. FIG. 8C shows the electrical LUT and the optical LUT each having the black reference. In this case, in the electrical LUT, the correction value is made zero when each of the gradations of the adjacent sub-pixels is the 0-th gradation corresponding to black, and in the optical LUT, the correction data is made zero when each of the gradations of the sub-pixels, having the same color, in the adjacent pixels on the right-hand side is the 0-th gradation corresponding to black. The LUT having the white reference has such an advantage that the gradation in a low-luminance portion in which the difference between each adjacent two gradations is noticeable can be widely corrected as compared with the case of the LUT having the auto-reference. The LUT having the auto-reference has such an advantage that the contract is high.

(22) Referring now to FIG. 7A, an R processing circuit 25 includes R gamma correcting circuits-1 to 12 each designated by reference numeral 35, a pixel counter 30, a gamma correcting circuit selecting portion 37, an R electrical LUT 38, an R optical LUT 39, an arithmetically operating portion 33, and an FRC processing circuit 34. In this case, the R gamma correcting circuits-1 to 12 (35) carries out the gamma corrections corresponding to the division areas D1 to D12, respectively. Also, the R gamma correcting circuits-1 to 12 (35) gamma-corrects the R data, of the sub-pixel as an object of the correction, sent from the preprocessing portion 24. The gamma correction values of the R gamma correcting circuits-1 to 12 (35) corresponding to the division areas D1 to D12 are obtained from the experiments on the division areas D1 to D12, respectively. For example, when the crosstalk obtained by combining the electrical crosstalk and the optical crosstalk in the division area D12 with each other is larger than that at the center of the display area 12, as shown in FIG. 10, the gamma correction is carried out in such a way that a gamma curve (gradation vs. luminance) is moved from a point A having gamma of 2.2 to a point B at which the luminance is reduced. The inventor found out that a method of taking measures to cope with the problem that the crosstalk differs depending on the difference in visual angle can be made collectively with the gamma corrections corresponding to the division areas D1 to D12, respectively, even when both the electrical crosstalk corrections and the optical crosstalk corrections corresponding to the division areas D1 to D12, respectively, are not carried out from the experiments and the studies. As a result, a simple configuration is obtained.

(23) The gamma correcting circuit selecting portion 37 extracts any one, of the gamma correcting circuits-1 to 12 (35), corresponding to the division areas D1 to D12, respectively, to which the sub-pixel as an object of the correction from the 12 gamma correcting circuits-1 to 12 (35) in accordance with an operation of the pixel center 30. The R electrical LUT 38 receives as it inputs the data on the gradations of the sub-pixels each as an object of the correction from the gamma correcting circuit selecting portion 37, and the data on the gradations of the right-hand side sub-pixels from the preprocessing portion 24, and extracts the electrical correction data from the correction table in which the electrical correction data has been transferred from the EEPROM 19 to be stored. The R optical LUT 39 receives as its inputs the data on the gradations of the sub-pixels each as an object of the correction from the gamma correcting circuit selecting portion 37, and the data on the gradations of the sub-pixels, having the same color, in the right-hand side pixels from the preprocessing portion 24, and extracts the optical correction data from the correction table in which the optical correction data has been transferred from the EEPROM 19 to be stored. The arithmetically operating portion 33 adds the correction data from the electrical LUT 38, and the correction data from the optical LUT 39 to each other.

(24) A Frame Rate Control (FRC) processing circuit 34 adds the correction data summed up in the arithmetically operating portion 33 to the data on the gradations of the sub-pixels each as an object of the correction from the preprocessing portion 24. Also, the FRC processing circuit 34 carries out the FRC with four frames as one cycle for the data of R inputted thereto from the arithmetically operating portion 33 and outputs the resulting data of R to the output signal creating portion 22. FIG. 9A is a diagram showing an example of disposition of the sub-pixels of the FRC. Also, FIG. 9B shows correction values for the sub-pixels of the FRC shown in FIG. 9A. The driving control for the luminances of the liquid crystal display panel 11 is carried out in units of one gradation. That is to say, it may be impossible to specify any of the gradations each not an integral number. However, a cycle of one picture (1,440 pixels540 pixels), that is, a frame cycle is as large as 60 Hz. Thus, as shown in FIG. 9B, by utilizing the residual image, four frames are set as one cycle, and the frames in each of which the increase is made by one gradation during one cycle are set as one frame, and thus 0.25 gradations are seemingly as one unit. The FRC is carried out in such a manner. For example, when during the time period of the 1.75 gradations, of four frames of one cycle, one frame is set as one gradation, and the remaining three frames are set as two gradations, the gradations appear as 1.75 gradations by the residual gradation. In addition, for the purpose of reducing a flicker as shown in FIG. 9A, the positions of the sub-pixels in each of which the increase is made by one gradation are scattered by changing the position of the frame. Each of the G processing circuit 26 and the B processing circuit 27 has the same configuration as that of the R processing circuit 25, and the G processing circuit 26 and the B processing circuit 27 carry out the crosstalk corrections for the G data and the B data from the preprocessing circuit 24 by using the LUTs corresponding to the division areas, respectively, and output the resulting G data and B data to the output signal creating portion 22. In such a manner, since the FRC processing is executed, there are also offered such effects that not only the delicate display can be carried out, but also any of the boundary lines among the division areas D1 to D12 come to have difficulty seeing.

(25) Next, a description will be given below with respect to image processing in the display device 10 having the configuration described above with reference to FIG. 5. When a power source switch (not shown) of the display device 10 is turned ON, the EEPROM controller 20 transfers the electrical correction tables and the optical correction tables of R, G and B in the EEPROM 19 to the crosstalk correcting portion 21. As shown in FIG. 5, the selecting portion 17 selects either the navigation image outputted from the navigation portion 15 or the DVD-reproduced image outputted from the DVD reproducing portion 16 as the first image. Also, the selecting portion 17 selects either the navigation image outputted from the navigation portion 15 or the DVD-reproduced image outputted from the DVD reproducing portion 16 as the second image. The two-picture synthesizing portion 18 sorts out the first image (1,440 pixels540 pixels) and the second image (1,440 pixels540 pixels) which are inputted thereto from the selecting portion 17 in a checkered pattern of the sub-pixels, thereby synthesizing the first image and the second image into one image (1,440 pixels540 pixels).

(26) The preprocessing portion 24 of the crosstalk correcting portion 21 sends the necessary data which is sent from the synthetic image inputted thereto from the two-picture synthesizing portion 18 to the R processing circuit 25, the G processing circuit 26, and the B processing circuit 27 synchronously with the synchronous signal. In the R processing circuit 25, the R gamma correcting circuits-1 to 12 (35) carry out the gamma correction for the R data of the sub-pixels each as an object of the correction from the preprocessing portion 24. The gamma correcting circuit selecting portion 37 extracts any one, of the 12 gamma correcting circuits-1 to 12 (35) corresponding to the division areas D1 to D12, respectively, to which the sub-pixels each as an object of the correction belong from the 12 gamma correcting circuits-1 to 12 (35). The R electrical LUT 38 receives as its inputs the data on the gradations of the sub-pixels each as an object of the correction from the gamma correcting circuit selecting portion 37, and the data on the gradations of the right-hand side sub-pixels from the preprocessing portion 24. Also, the R electrical LUT 38 extracts the electrical correction data from the correction table in which the electrical correction data has been transferred from the EEPROM 19 to be stored. The R optical LUT 39 receives as its inputs the data on the gradations of the sub-pixels each as an object of the correction from the gamma correcting circuit selecting portion 37, and the data on the gradations of the sub-pixels, having the same color, in the right-hand side pixels from the preprocessing portion 24. Also, the R optical LUT 39 extracts the optical correction data from the correction table in which the optical correction data has been transferred from the EEPROM 19 to be stored. The arithmetically operating portion 33 adds the correction data from the electrical LUT 38, and the correction data from the optical LUT 39 to each other. The FRC processing circuit 34 adds the correction data summed up in the arithmetically operating portion 33 to the data on the gradations of the sub-pixels each as an object of the correction from the preprocessing portion 24. Also, the FRC processing circuit 34 carries out the FRC with four frames as one cycle for the data of R inputted thereto from the arithmetically operating portion 33 and outputs the data of R to the output signal creating portion 22.

(27) Each of the G processing circuit 26 and the B processing circuit 27 executes the same processing as that executed by the R processing circuit 25. Also, after the G processing circuit 26 and the B processing circuit 27 carry out the gamma corrections corresponding to the respective division areas for the G data and the B data from the preprocessing circuit 24, respectively, the G processing circuit 26 and the B processing circuit 27 carry out the crosstalk corrections for the resulting G data and B data, respectively, and output the resulting G data and B data to the output signal creating portion 22. The output signal creating portion 22 controls the polarity and the timing for the signals which have been corrected in the crosstalk correcting portion 21 so that the signals which have been corrected in the crosstalk correcting portion 21 can be displayed in the form of the image on the liquid crystal display portion 23. The liquid crystal display portion 23 displays the image corresponding to the data of R, G and B from the output signal creating portion 22 on the internal liquid crystal panel 11.

(28) As has been described, according to the first embodiment, after the display area 12 is divided into the division areas D1 to D12, and the gamma corrections corresponding to the division areas D1 to D12, respectively, are carried out, the crosstalk corrections are carried out. As a result, it is possible to reduce the problem that the difference in visual angle is caused depending on the positions on the display area, so that the amount of crosstalk differs depending on the positions on the display area.

Second Embodiment

(29) Although a second embodiment will be described hereinafter with reference to corresponding ones of the accompanying drawings by focusing on a difference from the first embodiment, the second embodiment which will be shown below are not intended to limit the present application to the description. Thus, the present application can be equally applied to various kinds of changes which are made without departing from the technical idea shown in the appended claims. It is noted that in the drawings used for the descriptions in this specification, for the purpose of making layers and members have such sizes that they can be recognized on the drawings, the scale size is shown so as to be made to differ every layer and member, and thus is not necessarily shown in proportion to the actual size.

(30) The electrical correction tables of R, G and B, and the optical correction tables of R, G and B which correspond to the division areas D1 to D12 which will be described later, respectively, are stored in the EEPROM 19. The electrical correction data on the gradations of all the adjacent sub-pixels for all the gradations of the sub-pixels each as an object of correction is stored in the electrical correction table. Also, the optical correction data on all the gradations of the sub-pixels, having the same color, in the adjacent pixels for all the gradations of the sub-pixels each as an object of the correction is stored in the optical correction tables. The correction data is the values obtained from the experiments. The EEPROM controller 20 controls the operation for inputting/outputting the correction data to/from the EEPROM 19. The crosstalk correcting portion 21 carries out the crosstalk corrections by using the various kinds of LUTs stored in the EEPROM 19. The output signal creating portion 22 controls the polarity and the timing for the signals which have been corrected in the crosstalk correcting portion 21 so that the signals which have been corrected in the crosstalk correcting portion 21 can be displayed in the form of the image corresponding thereto on the liquid crystal display portion 23. The liquid crystal display portion 23 includes the liquid crystal display panel 11, and the backlight, the gate driver, and the source driver (each not shown), and the like. In this case, the liquid crystal display panel 11 includes the light blocking barrier, displays thereon the synthetic image, and allows the first image and the second image to be discriminated from each other in the different visual directions, respectively. Also, the liquid crystal display portion 23 displays the data of R, G and B from the output signal creating portion 22 in the form of the image corresponding thereto in the internal liquid crystal display panel 11.

(31) FIG. 7B is a detailed block diagram of the crosstalk correcting portion 21B. The crosstalk correcting portion 21B includes the preprocessing portion 24, the R processing circuit 25, the G processing circuit 26, and the B processing circuit 27. The preprocessing portion 24 sends the necessary data among the synthetic image which is from the two-picture synthesizing portion 18 to the R processing circuit 25, the G processing circuit 26, and the B processing circuit 27 synchronously with the synchronous signal. The R processing circuit 25, the G processing circuit 26, and the B processing circuit 27 carry out the crosstalk corrections for the data of R, G and B, respectively.

(32) Firstly, a description will be given with respect to the LUT for carrying out the crosstalk correction. As shown in FIGS. 11A and 11B, the visual angle differs depending on the positions on the display area 12. Therefore, not only the crosstalk due to the adjacent sub-pixels, but also the crosstalk due to the sub-pixels, having the same color, in the adjacent pixels differ in amount of crosstalk thereof depending on the positions on the display area. For this reason, in the second embodiment, as shown in FIG. 6, the display area 12 is divided into the 12 parts, i.e., the division areas D1 to D12, and the LUTs corresponding to the division areas D1 to D12, respectively, are provided as shown in FIG. 6. The division is carried out in units of pixels, and the delimiter of the 120 pixels which are obtained by dividing the 1,440 pixels in the transverse direction as the extension direction of the scanning lines into the 12 parts is set as the reference line B for the division. If the division is carried out with the reference line B, it is feared that the difference between the luminances due to the difference between the LUTs on the right-hand and left-hand sides of the reference line B appears in the form of the straight line. In order to cope with this situation, in the second embodiment, the boundary lines are made not to be clearly understandable in such a way that each of the boundary lines among the division areas D1 to D12 does not become a straight line, that is, each of the shapes of the division areas D1 to D12 does not become rectangular. Specifically, as shown in FIG. 6, each of the boundary lines is made zigzag with the reference line B approximately as a center. Although an enlarged diagram is shown only between the division areas D1 and D2 in FIG. 6, the boundary lines among other division areas D2 to D12 are each similarly zigzag. It is noted that a position of the zigzag is gradually changed by the FRC which will be described later, thereby making it also possible to further have difficulty seeing.

(33) The gradation data on the sub-pixel in the second embodiment is 6 bits of the normal black mode, and each of the luminances of R, G and B becomes 64 kinds from the 0-th gradation to the 63-th gradation. In addition, the display device 10 of the second embodiment has the normal black mode, and thus the 0-th gradation corresponds to black, and the 63-th gradation corresponds to white. Then, the electrical LUT as the correction table for the electrical crosstalk is the table of the correction values which are obtained based on the 0-th to 63-th gradations of the sub-pixels each as an object of the correction, and the 0-th to 63-th gradations of the adjacent sub-pixels on the right-hand side of those sub-pixels. The optical LUT as the correction table for the optical crosstalk is the table of the correction values which are obtained based on the 0-th to 63-th gradations of the sub-pixels each as an object of the correction, and the 0-th to 63-th gradations of the sub-pixels, having the same color, in the adjacent pixels on the right-hand side thereof.

(34) A plurality kind of electrical LUTs and optical LUTs are provided depending on the position where the reference of the gradation with which the correction data is made zero is set. For example, FIG. 8A shows the electrical LUT and the optical LUT each having the white reference. In this case, in the electrical LUT, the correction data is made zero when each of the gradations of the adjacent sub-pixels is the 63-th gradation corresponding to white, and in the optical LUT, the correction data is made zero when each of the gradations of the sub-pixels, having the same color, in the adjacent pixels on the right-hand side is the 63-th gradation corresponding to white. FIG. 8B shows the electrical LUT and the optical LUT each having the auto-reference in which the state not influenced from any of other sub-pixels is made another reference. In this case, in the electrical LUT, the correction value is made zero when both the gradations are equal to each other, and in the optical LUT, the correction data is made zero when each of the gradations of the sub-pixels, having the same color, in the adjacent pixels is the 0-th gradation corresponding to black free from the light leakage. FIG. 8C shows the electrical LUT and the optical LUT each having the black reference. In this case, in the electrical LUT, the correction value is made zero when each of the gradations of the adjacent sub-pixels is the 0-th gradation corresponding to black, and in the optical LUT, the correction data is made zero when each of the gradations of the sub-pixels, having the same color, in the adjacent pixels on the right-hand side is the 0-th gradation corresponding to black. The LUT having the white reference has the advantage such that the gradation in the low-luminance portion in which the difference between each adjacent two gradations is noticeable can be widely corrected as compared with the case of the LUT having the auto-reference. The LUT having the auto-reference has the advantage that the contract is high.

(35) The R processing circuit 25 includes the R electrical LUTs-1 to 12 each designated by reference numeral 28, the R optical LUTs-1 to 12 each designated by reference numeral 29, the pixel counter 30, the electrical LUT selecting portion 31, the optical LUT selecting portion 32, the arithmetically operating portion 33, and the FRC processing circuit 34. In this case, the R optical LUTs-1 to 12 (28) store therein the electrical correction tables for the R data corresponding to the division areas D1 to D12, respectively. Also, the R optical LUTs-1 to 12 (29) store therein the optical correction tables for the R data corresponding to the division areas D1 to D12, respectively. The R electrical LUTs-1 to 12 (28) receive as their inputs the data on the gradations of the sub-pixels each as an object of the correction, and the data on the sub-pixels on the right-hand side thereof which are sent from the preprocessing portion 24. Also, the R electrical LUTs-1 to 12 (28) extract the electrical correction data from the correction tables in which the electrical correction data has been transferred from the EEPROM 19 to be stored. The R optical LUTs-1 to 12 (29) receive as their inputs the data on the gradations of the sub-pixels each as an object of the correction, and the data on the gradations of the sub-pixels, having the same color, in the pixels on the right-hand side thereof both of which are sent from the preprocessing portion 24. Also, the R optical LUTs-1 to 12 (29) extract the optical correction data from the correction tables in which the optical correction data has been transferred from the EEPROM 19 to be stored. The connection tables of the R electrical LUTs-1 to 12 (28), and the R optical LUTs-1 to 12 (29) are respectively tables in which the correction data at the central portions of the division areas D1 to D12 corresponding thereto, respectively, is obtained from the experiments. For example, when an amount of optical crosstalk becomes large from the division area D7 approximately at the center toward the division area D12 at the edge portion, in any of the white reference, the auto-reference, and the black reference, an amount of correction in the correction table (an absolute value of the correction data) is gradually increased from the R optical LUT-7 toward the R optical LUT-12. For example, in the case where each of the gradations of the sub-pixels each as an object of the correction is taken to be i (i=0 to 63) and each of the gradations of the sub-pixels, having the same color, in the adjacent pixels is taken to be j (j=0 to 63), when the correction data in the optical crosstalk correction table for the n-th (n=1 to 12) division area Dn is taken to be Dn(i, j), a relationship of |D7(i, j)||D8((i, j)||D9(i, j)||D10(i, j)||D11(i, j)||D12(i, j)| is established.

(36) The electrical LUT selecting portion 31 extracts any one, of the 12 R electrical LUTs-1 to 12 (28) corresponding to the division areas D1 to D12, respectively, to which the sub-pixels each as an object of the correction belong from the 12 R electrical LUTs-1 to 12 (28) in accordance with the operation of the pixel counter 30. The optical LUT selecting portion 32 extracts any one, of the 12 R optical LUTs-1 to 12 (29) corresponding to the division areas D1 to D12, respectively, to which the sub-pixels each as an object of the correction belong from the 12 R optical LUTs-1 to 12 (29) in accordance with the operation of the pixel counter 30. The arithmetically operating portion 33 adds the correction data from the electrical LUT selecting portion 31, and the correction data from the optical LUT selecting portion 32 to each other.

(37) The FRC processing circuit 34 adds the correction data summed up in the arithmetically operating portion 33 to the data on the gradations of the sub-pixels each as an object of the correction from the preprocessing portion 24. Also, the FRC processing circuit 34 carries out the FRC with four frames as one cycle for the data of R inputted thereto from the arithmetically operating portion 33 and outputs the resulting data of R to the output signal creating portion 22. FIG. 9A is the diagram showing the example of disposition of the sub-pixels of the FRC. Also, FIG. 9B shows the correction values for the sub-pixels of the FRC shown in FIG. 9A. The driving control for the luminances of the liquid crystal display panel 11 is carried out in units of one gradation. That is to say, it may be impossible to specify any of the gradations each not an integral number. However, the cycle of one picture (1,440 pixels540 pixels), that is, the frame cycle is as larger as 60 Hz. Thus, as shown in FIG. 9B, by utilizing the residual image, four frames are set as one cycle, and the frames in each of which the increase is made by one gradation during one cycle are set as one frame, and thus the 0.25 gradations is seemingly as one unit. The FRC is carried out in such a manner. For example, when during the time period of the 1.75 gradations, of four frames of one cycle, one frame is set as one gradation, and the remaining three frames are set as two gradations, the gradations appear as the 1.75 gradations by the residual gradation. In addition, for the purpose of reducing the flicker, as shown in FIG. 9A, the positions of the sub-pixels in each of which the increase is made by 1 gradation are scattered by changing the position of the frame. Each of the G processing circuit 26 and the B processing circuit 27 has the same configuration as that of the R processing circuit 25, and the G processing circuit 26 and the B processing circuit 27 carry out the crosstalk corrections for the G data and the B data from the preprocessing circuit 24 by using the LUTs corresponding to the division areas, respectively, and output the resulting G data and B data to the output signal creating portion 22. In such a manner, since the FRC processing is executed, there are also offered the effects such that not only the delicate display can be carried out, but also any of the boundary lines among the division areas D1 to D12 come to have difficulty seeing.

(38) Next, a description will be given below with respect to the image processing in the display device 10 having the configuration described above with reference to FIG. 5. When the power source switch (not shown) of the display device 10 is turned ON, the EEPROM controller 20 transfers the electrical correction tables and the optical correction tables of R, G and B in the EEPROM 19 corresponding to the respective division areas to the crosstalk correcting portion 21. As shown in FIG. 5, the selecting portion 17 selects either the navigation image outputted from the navigation portion 15 or the DVD-reproduced image outputted from the DVD reproducing portion 16 as the first image. Also, the selecting portion 17 selects either the navigation image outputted from the navigation portion 15 or the DVD-reproduced image outputted from the DVD reproducing portion 16 as the second image. The two-picture synthesizing portion 18 sorts out the first image (1,440 pixels540 pixels) and the second image (1,440 pixels540 pixels) which are inputted thereto from the selecting portion 17 in the checkered pattern of the sub-pixels, thereby synthesizing the first image and the second image into one image (1,440 pixels540 pixels).

(39) The preprocessing portion 24 of the crosstalk correcting portion 21 sends the necessary data which is sent from the synthetic image inputted thereto from the two-picture synthesizing portion 18 to the R processing circuit 25, the G processing circuit 26, and the B processing circuit 27 synchronously with the synchronous signal. In the R processing circuit 25, the R electrical LUTs-1 to 12 (28) receive their inputs the data on the gradations of the sub-pixels each as an object of the correction, and the data on the gradations of the sub-pixels on the right-hand side thereof from the preprocessing portion 24. Also, the R electrical LUTs-1 to 12 (28) extract the electrical correction data from the respective correction tables in which the electrical correction data has been transferred from the EEPROM 19 to be stored. In addition, the R optical LUTs-1 to 12 (29) receive as their inputs the data on the gradations of the sub-pixels each as an object of the correction, and the data on the gradations of the sub-pixels, having the same color, on the right-hand side thereof from the preprocessing portion 24. Also, the R optical LUTs-1 to 12 (29) extract the optical correction data from the respective correction tables in which the optical correction data has been transferred from the EEPROM 19 to be stored. The electrical LUT selecting portion 31 extracts any one, of the 12 R electrical LUTs-1 to 12 (28) corresponding to the division areas D1 to D12, respectively, to which the sub-pixels each as an object of the correction belong from the 12 R electrical LUTs-1 to 12 (28) in accordance with the operation of the pixel counter 30. The optical LUT selecting portion 32 extracts any one, of the 12 R optical LUTs-1 to 12 (29) corresponding to the division areas D1 to D12, respectively, to which the sub-pixels each as an object of the correction belong from the 12 R optical LUTs-1 to 12 (29) in accordance with the operation of the pixel counter 30. The arithmetically operating portion 33 adds the correction data from the electrical LUT selecting portion 31, and the correction data from the optical LUT selecting portion 32 to each other. The FRC processing portion 34 adds the correction data summed up in the arithmetically operating portion 33 to the data on the gradations of the sub-pixels each as an object of the correction from the preprocessing portion 24. Also, the FRC processing portion 34 carries out the FRC, with four frames as one cycle, for the R data inputted from the arithmetically operating portion 33, and outputs the resulting R data to the output signal creating portion 22 in accordance with the operation of the pixel counter 30.

(40) Each of the G processing circuit 26 and the B processing circuit 27 executes the same processing as that executed in the R processing circuit 25. Also, the G processing circuit 26 and the B processing circuit 27 carry out the crosstalk correction for the G data and the B data which have been sent from the preprocessing circuit 24 by using the LUTs corresponding to the respective division areas, and output the resulting G data and B data to the output signal creating portion 22. The output signal creating portion 22 controls the polarity and the timing for the signals which have been corrected in the crosstalk correcting portion 21 so that the signals which have been corrected in the crosstalk correcting portion 21 can be displayed in the form of the image on the liquid crystal display portion 23. The liquid crystal display portion 23 displays the image corresponding to the data of R, G and B from the output signal creating portion 22 on the internal liquid crystal panel 11.

(41) As has been described, according to the second embodiment, after the display area 12 is divided into the division areas D1 to D12, and the crosstalk corrections corresponding to the positions on the display areas, respectively, are carried out by using the crosstalk correction tables corresponding to the division areas D1 to D12, respectively. As a result, it is possible to reduce the problem such that the difference in visual angle is caused depending on the positions on the display area, so that the amount of crosstalk differs depending on the positions on the display area.

(42) In each of the first and second embodiments of the present application, the display area is divided in the extension direction (in the transverse direction) of each of the scanning lines, thereby coping with the difference in amount of crosstalk in the extension direction (in the transverse direction) of each of the scanning lines. However, since the difference in visual angle is caused in the extension direction (in the longitudinal direction) as well of each of the signal lines, and thus an amount of crosstalk differs, the display area may be divided into division areas in the extension direction as well of each of the signal lines, and crosstalk correction tables corresponding to the division areas, respectively, may be used. In addition, the technique of each of the first and second embodiments for displaying the different images in the different visual directions, respectively, so as to allow the different images to be discriminated from each other is based on the slits having the checkered pattern of the light blocking barrier. However, the present application can also be applied to the display device using any other suitable method based on a light blocking pattern of a liquid crystal shutter, a lenticular lens or the like. In addition, although the display panel of each of the first and second embodiments is the liquid crystal display panel, the present application can also be applied to any other suitable display panel such as an organic EL. In addition, the present application can also be applied to the display device for monochrome display or monochrome color in which one pixel is composed of one sub-pixel.

(43) It should be understood that various changes and modifications to the presently preferred embodiments described herein will be apparent to those skilled in the art. Such changes and modifications can be made without departing from the spirit and scope and without diminishing its intended advantages. It is therefore intended that such changes and modifications be covered by the appended claims.