Display method based on backlight partition color adjustment Local color

Abstract

The present invention discloses a display method based on backlight partition color adjustment Local Color, which adopts a high refresh rate liquid crystal OC to skip CF assembly, and cooperates with independent RGB backlight partitions to adjust the color for liquid crystal display. The independent RGB backlight partitions are isolated by partition isolation grids. The cascade circuit between the TCON IC and the Gate driver of the liquid crystal OC outputs the CLK / STV signal and performs synchronous calibration with the external backlight controller to determine the position of the liquid crystal OC up scan line at any time. After the synchronous calibration is completed, the external backlight controller predicts the position of the liquid crystal OC up scan line and performs synchronous control on the corresponding RGB backlight partitions. The present invention reduces the cost of liquid crystal OC based on the partition color adjustment technology, while increasing the resolution and achieving the technical effect of energy saving and brightening, thereby providing display performance of the liquid crystal panel.

Description

Technical Field

[0001] The present invention relates to the field of liquid crystal display technology, and in particular to a display method based on backlight local color adjustment. Background Art

[0002] Temporal color mixing differs from area color mixing. Area color mixing involves arranging basic colors (typically red, green, and blue) in order of area distribution within the same plane. At sufficient distance, the human eye cannot distinguish between them, and only perceives the resulting mixed color. Temporal color mixing involves arranging basic colors (typically red, green, and blue) in time order. When the switching time is short enough, the human eye cannot distinguish between them, and only perceives the resulting mixed color.

[0003] Field Sequential Color (FSC) technology uses the principle of temporal color mixing, activating the backlight in red, green, and blue order, and overlaying the colorless grayscale image on the LCD panel to create a final color image. At any given time, the backlight in FSC technology is fixed at one of the three colors: red, green, and blue. FSC technology requires three consecutive frames to create any image.

[0004] FSC (Field Sequential Color) technology has two drawbacks. One is that when the LCD OC refreshes the display, the image above the scan line must match the current frame's color, and the image below the scan line must match the previous frame's color. These different color requirements cause color confusion. Another is that the backlight is turned off while the LCD panel refreshes the display, and turned on after the refresh is complete. Because the image refresh time and retrace time are 9:1, this will result in a black screen interval of approximately 90%. In the case of long black screens and short sudden displays, the human eye needs to frequently reposition and refocus, resulting in problems such as color separation and flickering. Summary of the Invention

[0005] The object of the present invention is to provide a display method based on backlight local color adjustment.

[0006] The technical solution adopted in the present invention is:

[0007] A display method based on backlight partition color adjustment Local color, when producing color LCD panels, skips the process of assembling CF color filter film to obtain a color filter-free LCD panel, and the backlight of the LCD panel is divided into several rows of backlight partitions, each row of backlight partitions contains several rectangular backlight sub-partitions; the light source in the backlight sub-partition is a three-primary color or four-primary color light source, and the backlight sub-partitions individually adjust the primary color brightness to mix colors; the LCD panel uses high refresh rate scanning to refresh the display, and the backlight sub-partitions quickly and independently use different color light sources in turn according to the LCD panel row scanning order to illuminate the monochrome grayscale picture separated from the original color picture corresponding to the backlight sub-partition, the sub-partition color light source and the grayscale picture are superimposed to synthesize the corresponding color sub-picture, and the color sub-pictures of all sub-partitions are combined to display the original color picture; the backlight of the LCD panel is isolated and partitioned by a partition isolation grid; when the picture is refreshed and displayed, During the retrace period after the beam, the CLK / STV signal output by the cascade circuit between the TCON timing control IC of the LCD panel and the Gate row scan driver IC is used as the synchronization calibration signal of the backlight controller to calculate and determine the position of the LCD panel's upstream scan line at any time in the next frame; the backlight controller turns off the backlight sub-partition light source of the corresponding row before calculating that the LCD panel's upstream scan line reaches the backlight sub-partition of the corresponding row; after calculating that the LCD panel's upstream scan line passes through the backlight sub-partition of the corresponding row, the backlight controller turns on the backlight sub-partition light source of the corresponding row according to the new color value and brightness value; different sub-partitions use different color light sources and grayscale image superposition synthesis methods, which can be arranged and combined to simultaneously exist in single-frame synthesis, double-frame synthesis, and triple-frame synthesis. At any time, each backlight sub-partition independently controls different color values ​​and brightness values, and there are no color restrictions.

[0008] Furthermore, the LCD panel skips the process of assembling CF color filter film and uses high refresh rate scanning to refresh the display. The color function is realized by the backlight partition color adjustment Local color according to the time sequence color mixing principle.

[0009] Furthermore, the color image to be displayed is first decomposed into color sub-images corresponding to the size of the backlight sub-partitions, and then the color sub-images are separated to obtain one or more monochrome grayscale images; the single monochrome grayscale image is converted into a colorless grayscale image for display on a colorless filter liquid crystal panel and color values ​​and brightness values ​​for backlight sub-partition color mixing.

[0010] Furthermore, the partition isolation grid is aligned with the non-display black matrix of the liquid crystal panel, and the positioning accuracy is ensured by the grooves on the partition isolation grid corresponding to the liquid crystal panel; the thermal expansion coefficient of the material of the partition isolation grid is close to the thermal expansion coefficient of glass to ensure accuracy at different temperatures.

[0011] Furthermore, when the backlight controller and the TCON timing circuit of the liquid crystal panel perform synchronous calibration to calculate the relationship between the position and time of the row scan line of the next frame, the synchronous calibration is performed during the retrace period of each frame or several frames after the screen refresh display is completed; the synchronous calibration signal is the Gate STV signal and Gate CLK signal sent by the TCON timing control IC of the liquid crystal panel to the cascaded Gate row scan driver IC; the synchronous calibration method is that after the backlight controller receives the Gate STV signal, it is spaced by several Gate CLK signals, that is, several row positions of the row scan line.

[0012] Furthermore, the sub-partitions within each row of backlight partitions and their adjacent sub-partitions in the same row and adjacent sub-partitions in different rows, the sub-partition colored light sources and the grayscale images are superimposed to synthesize corresponding colored sub-images, and the number of superimposed synthesis frames is the same or different, and the minimum number of superimposed synthesis times is one frame.

[0013] Furthermore, at any time, the color values ​​and brightness values ​​of the colored light sources of the sub-partitions within each row of the backlight partition and its adjacent sub-partitions in the same row or adjacent sub-partitions in different rows are the same or different, without any color restrictions.

[0014] The present invention adopts the above technical solution, uses a high refresh rate liquid crystal OC to skip CF assembly, and cooperates with independent RGB backlight partitions to adjust the color for liquid crystal display. The independent RGB backlight partitions are isolated by partition isolation grids. The cascade circuit between the TCONIC and Gate driver of the liquid crystal OC outputs the CLK / STV signal and performs synchronous calibration with the external backlight controller to determine the position of the liquid crystal OC up scan line at any time. After the synchronous calibration is completed, the external backlight controller predicts the position of the liquid crystal OC up scan line and performs synchronous control on the corresponding RGB backlight partitions. The partition color adjustment (Local Color) technology can reduce the cost of liquid crystal OC while improving the display performance of the liquid crystal panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments;

[0016] Figure 1 Schematic diagram of the pixel arrangement structure of a conventional liquid crystal display;

[0017] Figure 2 Schematic diagram of the pixel structure of the backlight sub-partition of a liquid crystal panel without a color filter film. Implementation Method

[0018] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0019] like Figure 1 Or as shown in 2, when producing a color LCD panel, the process of assembling a CF color filter film is skipped to obtain a color filter-free LCD panel. The backlight of the LCD panel is divided into several rows of backlight sub-partitions, and each row of backlight sub-partitions contains several rectangular backlight sub-partitions; the light source in the backlight sub-partition is a three-primary color or four-primary color light source, and the backlight sub-partition separately adjusts its primary color brightness for color mixing; the LCD panel uses a high refresh rate scan to refresh the display, and the backlight sub-partitions take turns quickly and independently in the order of the LCD panel row scan to illuminate the monochrome grayscale picture separated from the backlight sub-partition corresponding to the original color picture, and the sub-partition color light source and the grayscale picture are superimposed to synthesize the corresponding color sub-picture, and the color sub-pictures of all sub-partitions are combined to display the original color picture.

[0020] Furthermore, the LCD panel of the present invention skips the process of assembling CF color filters and utilizes a high-refresh rate scanning refresh display. Color functionality is achieved through backlight sub-regional color mixing using a time-sequential color mixing principle. The color image to be displayed is first decomposed into sub-images corresponding to the size of the backlight sub-regions. These sub-images are then separated to produce one or more monochrome grayscale images. The individual monochrome grayscale images are then converted into a colorless grayscale image for display on the LCD panel without a color filter, as well as color values ​​and brightness values ​​for backlight sub-region color mixing.

[0021] If the color image of the sub-partition is a yellow star, use the yellow light source of the backlight sub-partition to illuminate the colorless star grayscale pattern on the corresponding sub-partition on the LCD panel, which is called single-frame synthesis. If you want the yellow star to have purple eyes, after the first frame is completed, use the purple light source of the backlight sub-partition to illuminate the colorless eye grayscale pattern on the corresponding sub-partition on the LCD panel in the second frame, which is called double-frame synthesis. According to the FSC method, a three-primary color light source is used to continuously illuminate different colorless grayscale patterns on the corresponding sub-partitions on the LCD panel within three frames, which is called three-frame synthesis. The backlight of FSC technology is fixed to one of the three colors of red, green and blue, while the partition color adjustment (LocalColor) technology allows single-frame synthesis, double-frame synthesis, and triple-frame synthesis to exist at the same time without color restrictions.

[0022] Specifically, at any given time, the backlighting with Local Color technology is not fixed to a specific color. Different backlight sub-zones can have different colors, not limited to a few basic colors. For any scene, the backlighting with Local Color technology has no fixed number of composite frames, allowing different sub-zones to simultaneously have single-frame, dual-frame, or triple-frame composites.

[0023] Furthermore, the backlight of the liquid crystal panel of the present invention is isolated and partitioned by partition isolation grids; during the retrace period after the screen refresh display is completed, the CLK / STV signal output by the cascade circuit between the TCON timing control IC and the Gate row scan driver IC of the liquid crystal panel is used as the synchronization calibration signal of the backlight controller to calculate and determine the position of the liquid crystal panel's upstream scan line at any time in the next frame; the backlight controller turns off the backlight sub-partition light source of the corresponding row before calculating that the upstream scan line of the liquid crystal panel reaches the backlight sub-partition of the corresponding row; after calculating that the upstream scan line of the liquid crystal panel passes through the backlight sub-partition of the corresponding row, the backlight controller turns on the backlight sub-partition light source of the corresponding row according to the new color value and brightness value; different sub-partitions use different color light sources and grayscale image superposition synthesis methods, and can be arranged and combined to simultaneously exist in single-frame synthesis, double-frame synthesis, and triple-frame synthesis. At any time, each backlight sub-partition independently controls different color values ​​and brightness values, and there are no color limitation requirements.

[0024] Furthermore, the partition isolation grid is aligned with the non-display black matrix of the liquid crystal panel, and the positioning accuracy is ensured by the grooves on the partition isolation grid corresponding to the liquid crystal panel; the thermal expansion coefficient of the material of the partition isolation grid is close to the thermal expansion coefficient of glass to ensure accuracy at different temperatures.

[0025] Furthermore, when the backlight controller and the TCON timing circuit of the liquid crystal panel perform synchronous calibration to calculate the relationship between the position and time of the row scan line of the next frame, the synchronous calibration is performed during the retrace period of each frame or several frames after the screen refresh display is completed; the synchronous calibration signal is the Gate STV signal and Gate CLK signal sent by the TCON timing control IC of the liquid crystal panel to the cascaded Gate row scan driver IC; the synchronous calibration method is that after the backlight controller receives the Gate STV signal, it is spaced by several Gate CLK signals, that is, several row positions of the row scan line.

[0026] Furthermore, different sub-partitions use different methods of superimposing and synthesizing colored light sources and grayscale images, and the three synthesis methods of single-frame synthesis, double-frame synthesis, and triple-frame synthesis can be arranged and combined to exist simultaneously; the sub-partitions within each row of the backlight partition and the adjacent sub-partitions in the same row and the adjacent sub-partitions in different rows, the sub-partition colored light sources and grayscale images are superimposed to synthesize the corresponding colored sub-images, and the number of superimposed synthesis frames is the same or different, and the minimum number of superimposed synthesis times is one frame.

[0027] Furthermore, at any time, the color values ​​and brightness values ​​of the colored light sources of the sub-partitions within each row of the backlight partition and its adjacent sub-partitions in the same row or adjacent sub-partitions in different rows are the same or different, without any color restrictions.

[0028] In summary, the local color technology of the present invention does not have the two defects of the FSC technology. (1) When the liquid crystal OC refreshes the display screen, the screen above the row scan line needs to match the current frame color, and the screen below the row scan line needs to match the previous frame color. Different color requirements cause color confusion. The local color technology of the present invention turns off the corresponding backlight sub-partition light source before the row scan line on the liquid crystal panel reaches the backlight sub-partition; waits for the row scan line on the liquid crystal panel to pass through the backlight sub-partition, and then uses the new color to turn on the corresponding backlight sub-partition light source. The local color technology does not have the color confusion phenomenon of the FSC technology. (2) The FSC technology turns off the backlight during the liquid crystal OC refresh display screen, and turns on the backlight after the refresh display of the entire screen is completed, which will cause a black screen interval of about 90%, resulting in color separation, flickering and other problems. The local color technology of the present invention controls the corresponding backlight sub-partition line by line. If the resolution of the LCD panel is 1920*1080 and 2304 backlight sub-partitions are set up, the light source of each backlight sub-partition is turned off for about 3% of the time, while the backlight off time of FSC technology is as high as about 90%. When long-term display is combined with short-term black screen, the human eye does not need to reposition and focus, and there will be no problems such as color separation and flickering.

[0029] The present invention adopts the above technical solution, uses a high refresh rate liquid crystal OC to skip CF assembly, and cooperates with independent RGB backlight partitions to adjust the color for liquid crystal display. The independent RGB backlight partitions are isolated by partition isolation grids. The cascade circuit between the TCONIC and Gate driver of the liquid crystal OC outputs the CLK / STV signal and performs synchronous calibration with the external backlight controller to determine the position of the liquid crystal OC up scan line at any time. After the synchronous calibration is completed, the external backlight controller predicts the position of the liquid crystal OC up scan line and performs synchronous control on the corresponding RGB backlight partitions. The partition color adjustment (Local Color) technology can reduce the cost of liquid crystal OC while improving the display performance of the liquid crystal panel.

Claims

1. Based on the local color display method of backlight partitioning, the process of assembling CF color filter film is skipped during the production of color LCD panels to obtain a color filter-free LCD panel. The backlight of the LCD panel is divided into several rows of backlight partitions, and each row of backlight partitions contains several rectangular backlight sub-partitions; The light source in the backlight sub-partition is a three-primary color or four-primary color light source, and the backlight sub-partition independently adjusts the brightness of its primary color to mix colors; the liquid crystal panel uses a high refresh rate scan to refresh the display, and the backlight sub-partitions quickly and independently use different color light sources in turn according to the LCD panel row scanning order to illuminate the monochrome grayscale picture separated from the backlight sub-partition corresponding to the original color picture. The sub-partition color light source and the grayscale picture are superimposed to synthesize the corresponding color sub-picture, and the color sub-pictures of all sub-partitions are combined to display the original color picture; it is characterized in that: the backlight of the liquid crystal panel is isolated and partitioned by a partition isolation grid; during the retrace period after the picture refresh display is completed, the cascade connection between the TCON timing control IC of the liquid crystal panel and the Gate row scan driver IC is used The CLK / STV signal output by the circuit serves as the synchronization calibration signal of the backlight controller, and calculates and determines the position of the upstream scan line of the LCD panel at any time in the next frame; before calculating that the upstream scan line of the LCD panel reaches the backlight sub-partition of the corresponding row, the backlight controller turns off the backlight sub-partition light source of the corresponding row; after calculating that the upstream scan line of the LCD panel passes through the backlight sub-partition of the corresponding row, the backlight controller turns on the backlight sub-partition light source of the corresponding row according to the new color value and brightness value; different sub-partitions use different color light sources and grayscale image superposition synthesis methods, which can be arranged and combined to simultaneously exist in single-frame synthesis, double-frame synthesis, and triple-frame synthesis. At any time, each backlight sub-partition is independently controlled and has different color values ​​and brightness values, and there are no color restrictions.

2. The display method based on backlight local color matching according to claim 1, characterized in that: The LCD panel skips the process of assembling CF color filter film and uses high refresh rate scanning to refresh the display. The color function is realized by the backlight partition color adjustment Local color according to the time sequence color mixing principle.

3. The display method based on backlight local color matching according to claim 1, characterized in that: First, the color image to be displayed is decomposed into color sub-images corresponding to the size of the backlight sub-partition, and then the color sub-images are separated to obtain one or more monochrome grayscale images; the single monochrome grayscale image is converted into a colorless grayscale image for display on a color filter-free liquid crystal panel and color values ​​and brightness values ​​for backlight sub-partition color mixing.

4. The display method based on backlight local color matching according to claim 1, characterized in that: The partition isolation grid is aligned with the non-display black matrix of the liquid crystal panel, and the positioning accuracy is ensured by the grooves on the partition isolation grid corresponding to the liquid crystal panel; the thermal expansion coefficient of the material of the partition isolation grid is close to the thermal expansion coefficient of glass to ensure accuracy at different temperatures.

5. The display method based on backlight local color matching according to claim 1, characterized in that: When the backlight controller and the TCON timing circuit of the LCD panel are synchronized and calibrated to calculate the relationship between the position and time of the row scan line of the next frame, the synchronization calibration is performed during the retrace period of each frame or several frames after the screen refresh display is completed; the synchronization calibration signal is the Gate STV signal and Gate CLK signal sent by the TCON timing control IC of the LCD panel to the cascaded Gate row scan driver IC; the synchronization calibration method is that after the backlight controller receives the Gate STV signal, it is separated by several Gate CLK signals, that is, several row scan line positions.

6. The display method based on backlight local color matching according to claim 1, characterized in that: The sub-partitions in each row of backlight partitions are the same or different from the adjacent sub-partitions in the same row, the sub-partition color light sources of the adjacent sub-partitions in different rows, the corresponding color sub-pictures of the grayscale picture superposition synthesis, and the number of superposition synthesis frames. The minimum number of superposition synthesis times is one frame.

7. The display method based on backlight local color matching according to claim 1, characterized in that: At any time, the color values ​​and brightness values ​​of the colored light sources of the sub-partitions in each row of backlight partitions are the same or different from those of the adjacent sub-partitions in the same row and the adjacent sub-partitions in different rows, without any color restrictions.

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