Liquid crystal display method based on optical isolation partition and temporal color mixing principle

Abstract

Disclosed in the present invention is a liquid crystal display method based on an optical isolation partition and a temporal color mixing principle. A VSYNC frame synchronization signal or a DE display data enable signal which is generated by displaying a video signal is collected, a counter is triggered to record a delay time to the start of a first row scanning line of the next frame, the position of the row scanning line is determined, the color and brightness of a color light source in a corresponding optical isolation partition are updated, so that the defect of a backlight light source and a display pattern being mismatched in FSC technology is solved in cooperation with an optical isolation partition. The present invention includes three other methods: a method for realizing balanced emission of color backlight and improving a luminous intensity, which method improves the luminous intensity; an energy-saving display method for synchronously adjusting color-separated backlight and a grayscale pattern on the basis of an optical isolation partition, which method performs energy-saving optimization; and a display method for pre-light-compensation frame-reducing image synthesis based on a temporal color mixing principle, which method can reproduce an original color image just by using one or two frames.

Description

A liquid crystal display method based on the principle of optical isolation partitioning and time color mixing Technical Field

[0001] The present invention relates to the technical field of liquid crystal display, and in particular to a liquid crystal display method based on the principles of optical isolation, partitioning and time color mixing. Background Art

[0002] Temporal color mixing is a display technology that displays monochrome images in a time-sequential, high-speed sequence, overlaying three consecutive red, green, and blue monochrome images to create a color image. One such technology, called Field Sequential Color (FSC), implements this by first turning on all red backlights to illuminate the corresponding grayscale pattern, then turning on all green backlights to illuminate the corresponding grayscale pattern, and finally turning on all blue backlights to illuminate the corresponding grayscale pattern. The three consecutively displayed red, green, and blue monochrome images are then superimposed to create the final color image. Technical issues

[0003] At any given time, the backlight of FSC technology is fixed to one of the three colors: red, green, and blue. For any image, FSC technology requires three consecutive frames to synthesize. This has the disadvantages of fixed colors and a high number of frames required for synthesis.

[0004] When using FSC technology, when the LCD panel refreshes the display, the image above the scan line represents the updated current frame and requires backlighting with the current frame's color. The image below the scan line represents the previous frame, which has not yet been updated and requires backlighting with the previous frame's color. Regardless of the backlight color used, it is impossible to simultaneously match the images above and below the scan line, resulting in a mismatch between the backlight source and the displayed pattern. Technical Solutions

[0005] The present invention aims to provide a liquid crystal display method based on the principles of optical isolation and temporal color mixing. By collecting display video synchronization signals, using them to trigger a counter and then calculate a fixed delay, the position of the display row scan line is determined, and the color and brightness of the colored light sources within the optical isolation partitions it passes through are updated. This, combined with the optical isolation and partitioning, addresses the mismatch between the backlight source and the display pattern, a drawback of FSC technology.

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

[0007] (1) First, an anti-scattering grid or reflective cup array is installed on the array color backlight panel, and then an optical film and a high refresh rate non-color filter liquid crystal panel are installed thereon to partition the liquid crystal display area, wherein any partition is optically isolated from the other partitions. By using the optical isolation partition method, the color and brightness of the color light source in the partition can be independently adjusted without affecting other adjacent partitions. For the use of the color backlight in the optical isolation partition, a method for achieving color backlight luminescence balance and improving luminous intensity is set.

[0008] (2) Then, by collecting the display video synchronization signal to trigger the counter and then calculating the fixed delay, the position of the display row scan line is determined, and the color and brightness of the color light source in the optical isolation partition through which it passes are updated. For the color backlight source in the optical isolation partition and the high refresh rate non-color filter liquid crystal panel, an energy-saving display method based on the synchronous adjustment of the color backlight and grayscale pattern of the optical isolation partition is used to optimize energy saving.

[0009] (3) Finally, a display method of pre-fill light subtraction image synthesis based on the principle of time color mixing is used to complete the final color picture display. Beneficial effects

[0010] The technical effects of the present invention are: for a color LED backlight array panel, a method for achieving color backlight luminescence balance and improving luminous intensity is used for setting, thereby improving luminous intensity; for a color backlight source within a light-isolated partition and a high-refresh rate color filter-free liquid crystal panel, an energy-saving display method based on synchronous adjustment of the color separation backlight and grayscale pattern of the light-isolated partition is used for energy-saving optimization; a display method for pre-fill light subtraction frame image synthesis based on the principle of time mixing is adopted, which can reduce the method of reproducing the original color image by using the principle of time mixing to display three subframes in a fixed cycle continuously to only 1-2 frames to reproduce the original color image. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] No attached pictures Best Mode for Carrying Out the Invention

[0012] Embodiment 1 of the present invention provides a liquid crystal display method based on the principles of optical isolation and partitioning and temporal color mixing, which is described by taking a specific implementation as an example.

[0013] (1) When selecting a 1600*1200 resolution, high refresh rate, color filter-free LCD panel, a reflective cup array plate with 25 horizontal and 19 vertical reflective cups is molded out of an iron-nickel-cobalt Kovar alloy sheet with a thermal expansion coefficient close to that of the LCD panel. The reflective cup array plate is mounted on a color LED backlight array plate. Each individual rectangular reflective cup in the reflective cup array plate covers a display area of ​​64*64 pixels. The color LED backlight array plate is configured using a method for achieving color backlight luminescence balance and improving luminous intensity, which is implemented as step A.

[0014] (2) Optical films such as diffusion films, BEF prism films, and DBEF birefringent films with light-homogenizing and brightness-enhancing effects are installed on the molded reflective cup array board. Finally, a high-refresh rate, color-filter-free liquid crystal panel is installed on the optical film. The reflective cup array board can be used to partition the liquid crystal display area, and any partition is optically isolated from the other partitions. By using the optical isolation partitioning method, the color and brightness of the color light source in the partition can be independently adjusted without affecting other adjacent partitions.

[0015] (3) The initial time is determined by triggering the frame synchronization signal generated by the acquisition display video signal, and the time of each row of scanning lines is calculated according to the display resolution and refresh rate. The position of the row of scanning lines is determined by calculating the difference between the current time and the initial time, and the color and brightness of the color light source in the corresponding optical isolation partition are updated.

[0016] (4) For the color backlight source and the high refresh rate color filter-free liquid crystal panel in the optical isolation partition, an energy-saving display method based on the synchronous adjustment of the color backlight and grayscale pattern of the optical isolation partition is used to perform energy-saving optimization, which is implemented as step B.

[0017] (5) A display method of pre-fill light subtraction image synthesis based on the principle of time color mixing is used as step C to complete the final color picture display. Modes for Carrying Out the Invention

[0018] Example 2:

[0019] A second embodiment of the present invention provides a method for achieving balanced color backlighting and increasing luminous intensity. This method can be applied to the liquid crystal display method based on optical isolation, zoning, and temporal color mixing principles provided in the first embodiment, as a specific implementation of step A. Furthermore, this method for achieving balanced color backlighting and increasing luminous intensity can also be performed independently to increase the driving current share of the green and blue sub-light sources, significantly improving the average driving current and luminous intensity of the sub-light sources. This embodiment uses the independent implementation as an example for illustration.

[0020] (1) Select a 3030 packaged RGB-LED lamp as the red, green, and blue light source, and replace the blue LED chip with a red LED chip as the red, green, and red light source. The maximum current limit for each chip is 20mA. When the red chip is supplied with 18mA, the green chip with 13.5mA, and the blue chip with 4.5mA, the RGB-LED lamp emits white light with a color temperature of 6500K. The average current per chip is 12mA, and the average luminous intensity of each LED lamp is 2.85cd.

[0021] (2) The backlight micro unit is composed of two red, green and blue light sources and two red, green and red light sources arranged alternately, where the ratio of blue: green: red LED chips is 1:2:3.

[0022] (3) Hardware low blue light is achieved by using blue LED chips with a main wavelength of 460nm.

[0023] (4) All red sub-light sources in the backlight micro-unit are connected in series and driven individually, all green sub-light sources in the backlight micro-unit are connected in series and driven individually, and all blue sub-light sources in the backlight micro-unit are connected in series and driven individually.

[0024] (5) Use several backlight micro units to arrange into a complete color backlight.

[0025] (6) In the process of achieving color backlight luminescence balance, when the target is standard white light with a color temperature of 6500K, according to the method of using all red, green and blue light sources, the solution of 4 RGB-LED lights in a single backlight micro-unit has an average current of 12mA per chip and a luminous intensity of 11.4cd per backlight micro-unit; using the solution of 2 red, green and blue light sources and 2 red, green and red light sources in a single backlight micro-unit, the red chip has an 18mA current, the green chip has a 20mA current, and the blue chip has a 13.5mA current, with an average current of 18mA per chip and a luminous intensity of 17.1cd per backlight micro-unit; experiments have shown that using this method to achieve color backlight luminescence balance and improve luminous intensity can increase the average current of the sub-light source by 50% under the same maximum driving current limit of the sub-light source, thereby increasing the luminous intensity by 50%.

[0026] Example 3:

[0027] A third embodiment of the present invention provides an energy-saving display method for synchronously adjusting a color-separated backlight and a grayscale pattern based on optically isolated zoning. This method can be applied to the liquid crystal display method based on optically isolated zoning and temporal color mixing principles provided in the first embodiment, as a specific implementation of step B. Furthermore, this energy-saving display method for synchronously adjusting a color-separated backlight and a grayscale pattern based on optically isolated zoning can also be performed independently. By synchronously adjusting the color-separated backlight and the grayscale pattern, energy savings can be achieved while maintaining the same display. This embodiment uses the independent method as an example for illustration.

[0028] (1) When selecting a 1600*1200 resolution LCD panel, a reflective cup array plate with 25 horizontal and 19 vertical reflective cups is molded out of an iron-nickel-cobalt Kovar alloy sheet with a thermal expansion coefficient close to that of the LCD panel. The reflective cup array plate is then mounted on a color LED backlight array panel. Each individual rectangular reflective cup in the reflective cup array plate covers a display area of ​​64*64 pixels. Then, optical films such as a diffusion film, a BEF prism sheet, and a DBEF birefringent sheet with light-homogenizing and brightening effects are mounted on the molded reflective cup array plate. Finally, the LCD panel is mounted on the optical film. The reflective cup array plate can be used to partition the LCD display area, and any partition is optically isolated from the other partitions. By using the optical isolation partitioning method, the color and brightness of the color light source in the partition can be independently adjusted without affecting other adjacent partitions.

[0029] (2) The main controller inside the display decodes the video signal sent by the host computer to the display and separates the 64*64 pixel color display image corresponding to each reflector cup in the next frame. It then searches for the maximum grayscale level of the sub-pixel corresponding to the sub-light source within the optical isolation partition. The maximum grayscale level of the sub-pixel corresponding to the red sub-light source is 127; the maximum grayscale level of the sub-pixel corresponding to the green sub-light source is 63; and the maximum grayscale level of the sub-pixel corresponding to the blue sub-light source is 192.

[0030] (3) Because the grayscale range displayed by the LCD panel is 0-255, the upper limit of the grayscale range of the LCD panel is divided by the maximum value of the grayscale levels of the three sub-pixels, and the magnification corresponding to red is 2 times, the magnification corresponding to green is 4 times, and the magnification corresponding to blue is 1.33 times.

[0031] (4) The grayscale levels of all sub-pixels corresponding to the red sub-light source in the optical isolation partition are increased to 2 times, and the luminous intensity of the red sub-light source is reduced to 1 / 2. The 64*64 grayscale pattern with a grayscale level of 0-127 is illuminated by a 100% brightness backlight. The display effect is the same as that of the 64*64 grayscale pattern with a grayscale level of 0-255 using a 50% brightness backlight. Therefore, by synchronously adjusting the color separation backlight and the grayscale pattern, a 50% energy saving effect can be achieved without changing the display.

[0032] (5) Similarly, the grayscale levels of all sub-pixels corresponding to the green sub-light source in the optical isolation partition are increased to 4 times, and the luminous intensity of the green sub-light source is reduced to 1 / 4. A 100% brightness backlight is used to illuminate a 64*64 grayscale pattern with a grayscale level of 0-63. The display effect is the same as that of a 25% brightness backlight to illuminate a 64*64 grayscale pattern with a grayscale level of 0-255. By synchronously adjusting the color separation backlight and the grayscale pattern, a 75% energy saving effect can be achieved without changing the display.

[0033] (6) Similarly, the grayscale levels of all sub-pixels corresponding to the blue sub-light source in the optical isolation partition are increased to 1.33 times, and the luminous intensity of the blue sub-light source is reduced to 75%. The 64*64 grayscale pattern with a grayscale level of 0-192 is illuminated by a 100% brightness backlight. The display effect is the same as that of the 64*64 grayscale pattern with a grayscale level of 0-255 using a 75% brightness backlight. By synchronously adjusting the color separation backlight and the grayscale pattern, a 25% energy saving effect is achieved without changing the display.

[0034] Taking various situations into consideration, the use of this energy-saving display method based on optical isolation partitioning, color backlight and grayscale pattern synchronous adjustment can save an average of about 50% energy while keeping the display unchanged.

[0035] Example 4:

[0036] A fourth embodiment of the present invention provides a display method for pre-fill light subtraction frame image synthesis based on the principle of temporal color mixing. This method can be applied to the liquid crystal display method based on optical isolation and zoning and temporal color mixing provided in the first embodiment, as a specific implementation of step C. Furthermore, this display method for pre-fill light subtraction frame image synthesis based on the principle of temporal color mixing can also be performed independently, reducing the original color image reproduction method using the principle of temporal color mixing, which requires a fixed, continuous display of three subframes in a cycle, to only one or two frames. This embodiment uses the independent method as an example for illustration.

[0037] (1) The main controller inside the display decodes the video signal sent by the host computer to the display and separates the next frame of 64*64 pixel color display image. The image content is the image of a golden sun with purple eyes.

[0038] (2) Decompose a single color image into three monochrome images of red, green and blue. The three monochrome images are rearranged in a fixed order of green-red-blue according to their influence on the color image.

[0039] (3) The three monochrome images are further decomposed into a grayscale pattern in the shape of a sun illuminated by green light, a grayscale pattern in the shape of a sun with eyes illuminated by red light, and a grayscale pattern in the shape of an eye illuminated by blue light.

[0040] (4) Using the pre-fill light frame-reduction image synthesis method of the present invention, in the first subframe of the current display cycle, 100% green light is used to illuminate the sun-shaped grayscale pattern, and the entire green monochrome image is displayed. At the same time, 100% red light is used for pre-fill light, illuminating the sun-shaped grayscale pattern, and partially displaying the red monochrome image. At the same time, the calculation results show that the sun-shaped grayscale pattern has nothing to do with blue, and the blue light brightness is 0 and no pre-fill light is performed. Assuming that the image content is a golden sun image, to display the golden sun, it is only necessary to illuminate the sun-shaped grayscale pattern with (green light + red light), and the original golden sun image can be reproduced with only one subframe.

[0041] (5) Using the pre-fill light and frame-subtraction image synthesis method of the present invention, in the second subframe of the current display cycle, 100% red light is used to illuminate the eye-shaped grayscale pattern. Together with the sun-shaped grayscale pattern already displayed in the first subframe, the red monochrome image is fully displayed. At the same time, 100% blue light is used for pre-fill light to illuminate the eye-shaped grayscale pattern, displaying a blue monochrome image. The first subframe already displays a golden sun. To further display a golden sun with purple eyes, it is only necessary to use (red light + blue light) to illuminate the eye-shaped grayscale pattern in the second subframe. The original golden sun image with purple eyes can be reproduced using only two subframes. Industrial Applicability

[0042] Using a color filter-free LCD panel reduces LCD panel costs by 20%. Instead of three sub-pixels displaying one image point, three sub-pixels display three image points, tripling resolution. Conventional continuous spectrum color light loses only one-third of its energy after passing through a color filter, while a color filter-free panel can increase brightness by three times. Sequence Listing Free Content

[0043] Unordered list.

Claims

1. [Corrected 21.09.2024 in accordance with Rule 91] A liquid crystal display method based on the principle of light isolation partitioning and time mixing, characterized in that: The method comprises the following steps: First, an anti-scattering grid or a reflective cup array plate is installed on an array-type color backlight panel, and then an optical film and a high refresh rate non-color filter film liquid crystal panel are installed thereon to partition the liquid crystal display area, wherein any partition is optically isolated from other partitions. By means of the optical isolation partition method, the color and brightness of the color light source in the partition can be independently adjusted without affecting other adjacent partitions. For the color backlight in the optical isolation partition, a method for achieving color backlight luminescence balance and improving luminous intensity is set. Then, by collecting the display video synchronization signal to trigger the counter and then calculate the fixed delay, the position of the display row scan line is determined, and the color and brightness of the color light source in the optical isolation partition through which it passes is updated. For the color backlight source in the optical isolation partition and the high refresh rate non-color filter film liquid crystal panel, an energy-saving display method based on the synchronous adjustment of the color separation backlight and the grayscale pattern of the optical isolation partition is used to perform energy-saving optimization. Finally, a display method of pre-filling light subtraction frame image synthesis based on the principle of time color mixing is used to complete the final color picture display.

2. [Corrected 21.09.2024 in accordance with Rule 91] The method according to claim 1, characterized in that The use of a color filter-free LCD panel reduces the cost of the LCD panel by 20%. The original three sub-pixels displaying one image point together become three sub-pixels displaying three image points, and the resolution is increased by 3 times. After the continuous spectrum color light passes through the color filter, only 1 / 3 of the light energy is left, and the color filter-free can increase the brightness by 3 times.

3. [Corrected 21.09.2024 in accordance with Rule 91] The method according to claim 1, characterized in that A method for achieving color backlight luminescence balance and improving luminous intensity is adopted to achieve luminescence balance and improve luminous intensity. By selecting the wavelength of the blue sub-light source, a hardware low blue light solution is realized, which can increase the display brightness compared with the software low blue light solution that adjusts the blue grayscale level of the image. By simply increasing the current of the blue sub-light source, the luminous intensity of the blue sub-light source can be increased, and the hardware adjustment of the display color temperature can be achieved, which can increase the display brightness compared with the software adjustment of the display color temperature that adjusts the blue grayscale level of the image.

4. [Corrected 21.09.2024 in accordance with Rule 91] The method according to claim 1, characterized in that An energy-saving display method based on light-isolated partitioning and synchronous adjustment of color backlight and grayscale pattern is adopted to achieve energy-saving effect without changing the display.

5. [Corrected 21.09.2024 in accordance with Rule 91] The method according to claim 1, characterized in that A display method of pre-fill light subtraction frame image synthesis based on the principle of time color mixing can reduce the original method of using the time color mixing principle to continuously display three sub-frames in a cycle to reproduce the original color image to only 1-2 frames.

6. [Corrected 21.09.2024 in accordance with Rule 91] The method according to claim 1, characterized in that By collecting the display video synchronization signal to trigger the counter and then calculate the fixed delay, the position of the display row scan line is determined, and the color and brightness of the color light source in the optical isolation partition through which it passes are updated. The display video synchronization signal refers to the frame synchronization signal, the line synchronization signal, the display data enable signal, the display data clock signal, and any combination and arrangement of one or more of these signals. The display video synchronization signal can be located before the TCON timing control circuit or after the TCON timing control circuit. To calculate the fixed delay, you can calculate in advance according to the display resolution and refresh rate to obtain the time of each row of scan lines; or collect and obtain the line synchronization signal.