Method and device for improving LCD large viewing angle display effect

Abstract

Disclosed are a method and a device for improving an LCD large viewing angle display effect. The method includes: detecting an input RGB gray-scale voltage, when the input RGB gray-scale voltage meets a given preset condition, performing by a display panel an H/L switching display of two frames, and when the input RGB gray-scale voltage does not meet the given preset condition, performing by the display panel a normal display of two frames, wherein the given preset condition is: 80%*R.sub.specificationR120%*R.sub.specification, 80%*G.sub.specificationG120%*G.sub.specification or 80%*B.sub.specificationB120%*B.sub.specification.

Claims

1. A method for improving an LCD large viewing angle display effect, comprising steps of: detecting an input RGB gray-scale voltage, when the input RGB gray-scale voltage meets a given preset condition, performing by a display panel an H/L switching display of two frames, and when the input RGB gray-scale voltage does not meet the given preset condition, performing by the display panel a normal display of two frames, wherein the given preset condition is: any one of 80%*R.sub.specificationR0.120*R.sub.specification, 80%*G.sub.specificationG120%*G.sub.specification and 80%*B.sub.specificationB120%*B.sub.specification constitutes a first preset mode, wherein, R.sub.specification is a preset red gray-scale voltage threshold; G.sub.specification is a preset green gray-scale voltage threshold; B.sub.specification is a preset blue gray-scale voltage threshold; R is an input red gray-scale voltage; G is an input green gray-scale voltage; and B is an input blue gray-scale voltage, wherein the given preset condition is: 80%*R.sub.specificationR120%*R.sub.specification and 80%*G.sub.specificationG0.120%*G.sub.specification and 80%*B.sub.specificationB120%*B.sub.specification constitute a second preset mode.

2. A device for improving an LCD large viewing angle display effect, comprising: a voltage detecting unit, configured to detect an input RGB gray-scale voltage; and a switching display determination unit, configured to determine the input RGB gray-scale voltage so that when the input RGB gray-scale voltage meets a given preset condition, a display panel performs an H/L switching display of two frames, and when the input RGB gray-scale voltage does not meet the given preset condition, the display panel performs a normal display of two frames, wherein the given preset condition is: any one of 80%*R.sub.specificationR0.120*R.sub.specification, 80%*G.sub.specificationG120%*G.sub.specification and 80%*B.sub.specificationB120%*B.sub.specification constitutes a first preset mode, wherein, R.sub.specification is a preset red gray-scale voltage threshold; G.sub.specification is a preset green gray-scale voltage threshold; B.sub.specification is a preset blue gray-scale voltage threshold; R is an input red gray-scale voltage; G is an input green gray-scale voltage; and B is an input blue gray-scale voltage, wherein the given preset condition is: 80%*R.sub.specificationR120%*R.sub.specification and 80%*G.sub.specificationG0.120%*G.sub.specification and 80%*B.sub.specificationB120%*B.sub.specification constitute a second preset mode.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The present disclosure will be described in a more detailed way below based on embodiments and with reference to the accompanying drawings, in the drawings:

(2) FIG. 1 is a flow chart of a method for improving an LCD large viewing angle display effect according to the present disclosure;

(3) FIG. 2 is a sub-pixel signal design method for a frame switching, wherein 1 represents one frame signal; 2 represents another frame signal; H represents a high gray scale; and L represents a low gray scale;

(4) FIG. 3 is a general distribution form of H/L signals; reference sign A represents brightness corresponding to the high gray scale; reference sign B represents brightness corresponding to the low gray scale; and

(5) FIGS. 4-10 are all flow charts of a method for improving an LCD large viewing angle display effect according to the present disclosure.

(6) In the accompanying drawings, same components use same reference signs. The accompanying drawings are not drawn according to actual proportions.

DETAILED DESCRIPTION OF THE EMBODIMENTS

(7) The prior art discloses that sub-pixels in a predetermined region of a liquid crystal panel are driven by a cycle of M successive frames, wherein the polarities of the sub-pixel driving voltages of the successive first predetermined number of frames in the M frames are same, and the polarity of the sub-pixel driving voltage of each frame other than the first predetermined number of frames in the M frames is opposite to the polarity of the sub-pixel driving voltage of an adjacent frame.

(8) The present disclosure describes a method for improving an LCD large viewing angle display effect. This method combines the LCS transformations of time and space signal processing to achieve a good large viewing angle improvement effect in 4 domains. However, due to the reasons that the drive frequency is not high enough (120 to 240 Hz), the liquid crystal response is not fast enough, and the gray-scale difference between two frames during switching is too large, and so on, the flicker phenomenon is sometimes observed in the picture. Thus, in the prior art, it is known that the large viewing angle display effect can be improved by time signal transformation. That is, at a higher frequency, one frame displays the signal of BL (GL/RL), and the other frame displays the signal of BH (RH/GH).

(9) However, during the design of the time and space mixed 4 domains to alleviate the color shift at a large viewing angle, there are two problems that cannot be avoided, i.e.,

(10) (1) the problem that the decrease of a spatial resolution leads to the loss of the resolution in the details of the picture;

(11) (2) the problem that the decrease of a time resolution leads to the flicker in switching of light and dark pictures (referring to FIG. 2 for detail).

(12) In actual situation, if the brightness difference between two frames of one same sub-pixel is too large, the possibility of generating a flicker phenomenon will be increased. Considering that the general distribution form of H/L signals is generally roughly like the contour of the curve as shown in FIG. 3, the maximum gray-scale difference position of H/L is in the vicinity of 150-170 gray scales, while the maximum brightness difference position has a slightly higher gray scale than the maximum gray-scale difference position.

(13) In order to avoid the flicker phenomenon that may occur when brightness difference between two frames is large, the input images are distinguished. The present disclosure proposes the following solution.

(14) Firstly, it proposes an image pattern, in which front viewing and side viewing will lead to great subjective difference perceptions obviously, and a series of matching values of their gray-scale R/G/B are listed, such as a 9 chromaticity viewing angle pattern in the national standard and a skin color pattern. The 9 chromaticity viewing angle pattern is shown in Table 1, and meanwhile it also includes other matching situations of R/G/B individually defined by the designer.

(15) TABLE-US-00001 TABLE 1 a) 0-255 b) 16-235 Range Setting Range Setting Occasion (Analog Occasion (Digital Serial Interface Input) Interface Input) Color Number R G B R G B Sample 1 115 82 68 115 87 74 Dark Skin 2 194 150 130 183 145 128 Skin Light 3 56 61 150 64 69 145 Blue 4 70 148 73 76 143 79 Green 5 175 54 60 166 62 68 Red 6 231 199 31 214 187 43 Yellow 7 187 86 149 177 90 143 Magenta 8 8 133 161 23 130 154 Cyan 9 122 122 121 121 121 120 Gray

(16) Thus, for the above pattern, there are a series of specifications of R/G/B gray-scale matching, and in the input image signals,
80%*R.sub.specificationR120%*R.sub.specification(1),
80%*G.sub.specificationG120%*G.sub.specification(2),
80%*B.sub.specificationB120%*B.sub.specification(3),

(17) when any one, any two or three of the above formulas (1), (2) and (3) are satisfied, the logic of the H/L switching is defined as True, that is, the display panel performs an H/L switching display of two frames; otherwise, it is defined as False, that is, the display panel performs a normal display of two frames.

(18) For a display device with 120 Hz or a higher drive frequency, when in the time and space mixed or time H/L switching, by distinguishing the input signal of each sub-pixel, it is possible to effectively discriminate between the pattern that needs to be switched and the pattern that does not need to be switched, and to alleviate the flicker phenomenon appearing on part of the picture.

(19) The method provided by the present disclosure can be applied to the design of a blue laser communication system, and can also be applied to the design of a single or combined H/L switching of R/G/B display device.

(20) The method can also effectively avoid the loss of the resolution caused by the space H/L switching technology, and can also alleviate the flicker caused by the time H/L switching.

(21) The present disclosure will be further described below in combination with the accompanying drawings.

(22) In FIG. 4, a method for improving an LCD large viewing angle display effect is introduced. The method comprises the following steps.

(23) In step S400, an input RGB gray-scale voltage is detected.

(24) In step S401, when the input RGB gray-scale voltage meets any preset condition, a display panel performs an H/L switching display of two frames, wherein the preset condition is:
80%*R.sub.specificationR120%*R.sub.specification,

(25) where, R.sub.specification is a preset red gray-scale voltage threshold.

(26) In step S402, when the input RGB gray-scale voltage does not meet the preset condition, the display panel performs a normal display of two frames, wherein the preset condition is:
80%*R.sub.specificationR120%*R.sub.specification,

(27) where, R.sub.specification is a preset red gray-scale voltage threshold.

(28) In FIG. 5, a method for improving an LCD large viewing angle display effect is introduced. The method comprises the following steps.

(29) In step S500, an input RGB gray-scale voltage is detected.

(30) In step S501, when the input RGB gray-scale voltage meets any preset condition, a display panel performs an H/L switching display of two frames, wherein the preset condition is:
80%*G.sub.specificationG120%*G.sub.specification,

(31) where, G.sub.specification is a preset green gray-scale voltage threshold.

(32) In step S502, when the input RGB gray-scale voltage does not meet the preset condition, the display panel performs a normal display of two frames, wherein the preset condition is:
80%*G.sub.specificationG120%*G.sub.specification,

(33) where, G.sub.specification is a preset green gray-scale voltage threshold.

(34) In FIG. 6, a method for improving an LCD large viewing angle display effect is introduced. The method comprises the following steps.

(35) In step S600, an input RGB gray-scale voltage is detected.

(36) In step S601, when the input RGB gray-scale voltage meets any preset condition, a display panel performs an H/L switching display of two frames, wherein the preset condition is:
80%*B.sub.specificationB120%*B.sub.specification,

(37) where, B.sub.specification is a preset blue gray-scale voltage threshold.

(38) In step S602, when the input RGB gray-scale voltage does not meet the preset condition, the display panel performs a normal display of two frames, wherein the preset condition is:
80%*B.sub.specificationB120%*B.sub.specification,

(39) where, B.sub.specification is a preset blue gray-scale voltage threshold.

(40) In FIG. 7, a method for improving an LCD large viewing angle display effect is introduced. The method comprises the following steps.

(41) In step S700, an input RGB gray-scale voltage is detected.

(42) In step S701, when the input RGB gray-scale voltage meets any preset condition, a display panel performs an H/L switching display of two frames, wherein the preset condition is:
80%*R.sub.specificationR120%*R.sub.specification and 80%*G.sub.specificationG120*G.sub.specification,

(43) where, R.sub.specification is a preset red gray-scale voltage threshold; and G.sub.specification is a preset green gray-scale voltage threshold;

(44) In step S702: when the input RGB gray-scale voltage does not meet the preset condition, the display panel performs a normal display of two frames, wherein the preset condition is:
80%*R.sub.specificationR120%*R.sub.specification and 80%*G.sub.specificationG120*G.sub.specification,

(45) where, R.sub.specification is a preset red gray-scale voltage threshold; and G.sub.specification is a preset green gray-scale voltage threshold.

(46) In FIG. 8, a method for improving an LCD large viewing angle display effect is introduced. The method comprises the following steps.

(47) In step S800, an input RGB gray-scale voltage is detected.

(48) In step S801, when the input RGB gray-scale voltage meets any preset condition, a display panel performs an H/L switching display of two frames, wherein the preset condition is:
80%*R.sub.specificationR120%*R.sub.specification and 80%*B.sub.specificationB120*B.sub.specification,

(49) where, R.sub.specification is a preset red gray-scale voltage threshold; and B.sub.specification is a preset blue gray-scale voltage threshold;

(50) In step S802, when the input RGB gray-scale voltage does not meet the preset condition, the display panel performs a normal display of two frames, wherein the preset condition is:
80%*R.sub.specificationR120%*R.sub.specification and 80%*B.sub.specificationB120*B.sub.specification,

(51) where, R.sub.specification is a preset red gray-scale voltage threshold; and B.sub.specification is a preset blue gray-scale voltage threshold.

(52) In FIG. 9, a method for improving an LCD large viewing angle display effect is to introduced. The method comprises the following steps.

(53) In step S900, an input RGB gray-scale voltage is detected.

(54) In step S901, when the input RGB gray-scale voltage meets any preset condition, a display panel performs an H/L switching display of two frames, wherein the preset condition is:
80%*G.sub.specificationG120%*G.sub.specification and 80%*B.sub.specificationB120%*B.sub.specification,

(55) where, G.sub.specification is a preset green gray-scale voltage threshold; and B.sub.specification is a preset blue gray-scale voltage threshold;

(56) In step S902, when the input RGB gray-scale voltage does not meet the preset condition, the display panel performs a normal display of two frames, wherein the preset condition is:
80%*G.sub.specificationG120%*G.sub.specification and 80%*B.sub.specificationB120%*B.sub.specification,

(57) where, G.sub.specification is a preset green gray-scale voltage threshold; and B.sub.specification is a preset blue gray-scale voltage threshold.

(58) In FIG. 10, a method for improving an LCD large viewing angle display effect is introduced. The method comprises the following steps.

(59) In step S1000, an input RGB gray-scale voltage is detected.

(60) In step S1001, when the input RGB gray-scale voltage meets any preset condition, a display panel performs an H/L switching display of two frames, wherein the preset condition is:
80%*R.sub.specificationR120%*R.sub.specification,80%*G.sub.specificationG120%*G.sub.specification and 80%*B.sub.specificationB120%*B.sub.specification,

(61) where, R.sub.specification is a preset red gray-scale voltage threshold; G.sub.specification is a preset green gray-scale voltage threshold; and B.sub.specification is a preset blue gray-scale voltage threshold;

(62) In step S1002, when the input RGB gray-scale voltage does not meet the preset condition, the display panel performs a normal display of two frames, wherein the preset condition is:
80%*R.sub.specificationR120%*R.sub.specification,80%*G.sub.specificationG120%*G.sub.specification and 80%*B.sub.specificationB120%*B.sub.specification,

(63) where, R.sub.specification is a preset red gray-scale voltage threshold; G.sub.specification is a preset green gray-scale voltage threshold; and B.sub.specification is a preset blue gray-scale voltage threshold.

(64) Although the present disclosure has been described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the present disclosure. It should therefore be understood that numerous modifications may be made to the exemplary embodiments and that other arrangements may be designed as long as they do not deviate from the spirit and scope of the present disclosure as defined by the appended claims. It should be understood that, different dependent claims and the features described herein can be combined in a manner different from that described in the original claims. It is also understandable that the features described in connection with the individual embodiments may be used in other embodiments.