Method for changing display mode of liquid crystal screen and LCD projection device using the method

Abstract

The present disclosure discloses a method for changing a landscape signal of a liquid crystal screen to a portrait mode. The method comprises: adjusting the setting of a built-in driving TCON (time controller) IC (chipset) of the LCD so as to change the input signal interface of the LCD from an MIPI (mobile industry processor interface) to a TTL (transistor-transistor level) data/timing interface+SPI (serial peripheral interface) command control interface; controlling the initialization, turning-on and turning-off of the driving TCON IC via the SPI interface, and realizing the switching among four projection modes, desktop front projection, desktop rear projection, ceiling front projection, and ceiling rear projection, by adjusting the up, down, left and right display directions of a screen output image; receiving, in real time, the landscape image outputted by a front-end video processing chip through the TTL data interface, and then displaying same in real time.

Claims

1. A method for changing display mode of a liquid crystal screen including a liquid crystal display (LCD) terminal, the method comprising: (1) adjusting a setting of a built-in driving time controller (TCON) chipset (IC) of LCD to change an input signal interface of the LCD from a mobile industry processor interface (MIPI) to a transistor-transistor level (TTL) data interface+serial peripheral interface (SPI) command control interface; (2) controlling initialization, turning-on and turning-off of the driving TCON IC) via the SPI, and realizing switching among four projection modes including desktop front projection, desktop rear projection, ceiling front projection, and ceiling rear projection, by adjusting up, down, left and right display directions of a screen output image; (3) receiving, in real time, a landscape image outputted by a front-end video processing chip through the TTL data interface, and then displaying same in real time.

2. The method for changing display mode of a liquid crystal screen according to claim 1, further comprises an algorithm correction step for the diagonal tangent line abnormality display, the step comprising: adjusting a signal synchronization control of a TCON driving chipset IC of the LCD screen and a synchronization and effective transmission time of an image outputted by a video processing single chip microcomputer, forcibly separating an image data writing time and a reading display time of an internal data storage random access memory (RAM) of the TCON driving IC, when the image outputted by the video processing single chip microcomputer becomes a complete field of image, stopping image data writing, letting the screen start reading and displaying, and upon the completion of the displaying of the complete field of image, starting writing of a new field of image, repeating the above steps.

3. The method for changing display mode of a liquid crystal screen according to claim 1, further comprises an algorithm correction step for image interference and flickering abnormality display, the step comprising: reducing a vertical refresh frequency of the image outputted by the video processing chip, reducing a data transmission rate to satisfy a rate bandwidth limit condition of a TTL signal line, avoiding the image interference and flickering caused by data errors during image data transmission.

4. The method for changing display mode of a liquid crystal screen according to any one of claim 1, wherein the step (1) comprises: setting a configuration pin IM2-0 of the driving IC to 100, configuring the interface to be a Red-Green-Blue (RGB)+SPI interface, instead of the corresponding MIPI in the case of 110, changing the input signal interface of the LCD from the MIPI to the TTL data interface+SPI command control interface.

5. The method for changing display mode of a liquid crystal screen according to any one of claim 1, wherein the step (2) comprises: controlling the initialization, turning-on and turning-off of the TCON IC by means of the SPI interface, that is, initializing the screen state at a time of booting; after the initialization is completed, waiting until a front-end input image signal is normal and stable, turning on the displaying of the screen; when shutting down, first turning off the image display, thereafter turning off the screen, and then realizing the switching among the four projection modes including the desktop front projection, the desktop rear projection, the ceiling front projection, and the ceiling rear projection, by adjusting the up, down, left and right display directions of the screen output image, that is, controlling, by means of MX and MY data bits on the register 0x36H of the driving IC, a data writing order in horizontal and vertical directions of the screen, and controlling the flipping of the projection direction as follows: when the MX value is 0, displaying in a positive order in a horizontal direction; when the MX value is 1, displaying in an inverted order in a horizontal direction; when the MY value is 0, displaying in a positive order in a vertical direction; when the MY value is 1, displaying in an inverted order in a vertical direction.

6. A liquid crystal display (LCD) projection device including a LCD terminal, wherein the LCD terminal comprises: a first unit for adjusting a setting of a built-in driving time controller (TCON) chipset (IC) of the LCD to change an input signal interface of the LCD from a mobile industry processor interface (MIPI) to a transistor-transistor level (TTL) data interface+serial peripheral interface (SPI) command control interface; a second unit for controlling initialization, turning-on and turning-off of the driving TCON IC via the SPI command control interface, and realizing switching among four projection modes including desktop front projection, desktop rear projection, ceiling front projection, and ceiling rear projection, by adjusting up, down, left and right display directions of a screen output image; and a third unit for receiving, in real time, a landscape image outputted by a front-end video processing chip through the TTL data interface, and then displaying same in real time.

7. The LCD projection device according to claim 6, further comprises a correction unit for a diagonal tangent line abnormality display.

8. The LCD projection device according to claim 6, further comprises a correction unit for image interference and flickering abnormality display.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a diagram of parameters before and after the modification of the settings of the driving TCON IC described in the present disclosure.

DETAILED DESCRIPTION OF THE EMBODIMENTS

(2) The present disclosure will be further described in detail below in conjunction with experimental examples and specific embodiments. However, it should not be understood that the scope of the above subject matter of the present disclosure is limited to the following embodiments, and any technology implemented based on the content of the present disclosure falls within the scope of the present disclosure.

Embodiment 1

(3) A method for changing the display mode of a liquid crystal screen, including an LCD terminal, comprising the following steps:

(4) (1) adjusting the setting of a built-in driving TCON IC of the LCD so as to change the input signal interface of the LCD from the MIPI to the TTL data/timing+SPI command control interface;

(5) (2) controlling the initialization, turning-on and turning-off of the driving TCON IC via the SPI, and realizing the switching among four projection modes, desktop front projection, desktop rear projection, ceiling front projection, and ceiling rear projection, by adjusting the up, down, left and right display directions of a screen output image;

(6) (3) receiving, in real time, the landscape image outputted by a front-end video processing chip through the TTL data interface, and then displaying same in real time.

Embodiment 2

(7) A method for changing the display mode of a liquid crystal screen, including an LCD terminal, comprising the following steps:

(8) (1) adjusting the setting of a built-in driving TCON IC of the LCD so as to change the input signal interface of the LCD from the MIPI to the TTL data/timing+SPI command control interface;

(9) (2) controlling the initialization, turning-on and turning-off of the driving TCON IC via the SPI, and realizing the switching among four projection modes, desktop front projection, desktop rear projection, ceiling front projection, and ceiling rear projection, by adjusting the up, down, left and right display directions of a screen output image;

(10) (3) receiving, in real time, the landscape image outputted by a front-end video processing chip through the TTL data interface, and then displaying same in real time.

(11) The method of the present disclosure further includes an algorithm correction step for diagonal tangent line abnormality display, the step being specifically as follows:

(12) adjusting the signal synchronization control of the TCON driving IC of the LCD screen and the synchronization and effective transmission time of the image outputted by the video processing single chip microcomputer, forcibly separating the image data writing time and reading display time of the internal data storage RAM of the screen driving IC, when the image outputted by the video processing single chip microcomputer becomes a complete field of image, stopping image data writing, letting the screen start reading and displaying, and upon the completion of the displaying of a field of image, starting the writing of a new field of image, performing the cycle.

(13) As the arrangement of the data of the received image when written into the internal data storage RAM of the TCON driving IC of the LCD screen has been changed, the original landscape image is converted into a portrait image, which will cause the problem that image data is not synchronized in sequence among being written, read out and displayed, thereby resulting in the case when a motion picture is currently displayed, a part of the picture is still a previous field of image while the other part is the new field of image, and the difference between the two fields of image will lead to an obvious boundary which appears as a diagonal tangent line. By changing the signal synchronization control of the TCON driving IC of the LCD screen and the synchronization and effective transmission time setting of the image outputted by the video processing single chip microcomputer, the image data writing time and reading display time of the internal data storage RAM of the screen driving IC are forcibly separated. When the image outputted by the video processing microcomputer becomes a complete field image, the image data writing is stopped, the screen starts reading and displaying, and upon the completion of the displaying of a field of image, the writing of a new field of image starts, and the cycle goes on. The integrity of the displayed image is guaranteed, avoiding the diagonal tangent line phenomenon which is caused when displaying a motion picture due to the unsynchronized data writing and reading.

(14) The method of the present disclosure further includes an algorithm correction step for image interference and flickering abnormality display, the step being as follows:

(15) reducing the vertical refresh frequency of the image outputted by the video processing chip, reducing the data transmission rate, so as to satisfy the rate bandwidth limit condition of a TTL signal line, avoiding the display image interference and flicker caused by data errors during image data transmission.

(16) As the originally synchronized image output by the video processing single chip microcomputer and image display on the screen are forcibly separated chronologically, the transmission rate of the image data being transmitted on the TTL data transmission line is more than doubled, while the data transmission rate supported by the TTL signal line itself is relatively low, and because the forced modification reduces the vertical refresh frequency of the image outputted by the video processing chip (VSync) and reduces the data transmission rate, so as to satisfy the rate bandwidth limit conditions of the TTL signal line, the display image interference and flicker caused due to data errors during image data transmission are avoided.

(17) The step (1) of the present disclosure is specifically as follows: setting the configuration pin IM2-0 of the driving IC to 100, configuring the interface to be the RGB+ SPI, instead of the corresponding MIPI in the case of 110, thereby changing the input signal interface of the LCD from the MIPI interface to the TTL data/timing+SPI command control interface.

(18) The step (2) of the present disclosure is specifically as follows: controlling the initialization, turning-on and turning-off of the driving TCON IC by means of the SPI interface, that is, initializing the screen state at the time of booting; after the initialization is completed, waiting until the front-end input image signal is normal and stable, turning on the displaying of the screen; when shutting down, first turning off the image display, thereafter turning off the screen, and then realizing the switching among four projection modes, desktop front projection, desktop rear projection, ceiling front projection, and ceiling rear projection, by adjusting the up, down, left and right display directions of the screen output image; that is, controlling, by means of the MX and MY data bits on the register 0x36H of the driving IC, the data writing order in horizontal and vertical directions of the screen, and controlling the flipping of the projection direction, specifically as follows: when the MX value is 0, displaying in a positive order in a horizontal direction; when the MX value is 1, displaying in a reverse order in a horizontal direction; when the MY value is 0, displaying in a positive order in a vertical direction; when the MY value is 1, displaying in a reverse order in a vertical direction.

Embodiment 3

(19) An LCD projection device comprising an LCD terminal, the LCD terminal comprising:

(20) a first unit for adjusting the LCD input interface in the manner of the step (1) of the method in Embodiment 1; a second unit for controlling the driving TCON IC in the manner of the step (2) of the method in Embodiment 2 so as to implement the switching of the projection modes; and a third unit for outputting the image in the manner of the step (3) of the method in Embodiment 1.

(21) The device according to the present disclosure further includes a correction unit for a diagonal tangent line abnormality display.

(22) The device of the present disclosure further includes a correction unit for image interference and flickering abnormality display.

(23) The foregoing descriptions are merely embodiments of the present disclosure and are not intended to limit the present disclosure. Any modification, equivalent replacement and improvement made within the spirit and principle of the present disclosure shall be included in the protection of the present disclosure.