Optical isolation partition-based energy-saving display method for synchronously adjusting segmented backlight and gray scale pattern

Abstract

An optical isolation partition-based energy-saving display method for synchronously adjusting a segmented backlight and a gray scale pattern. Firstly, by using an optical isolation partition method, the color and brightness of a color light source in a partition can be independently adjusted, and other adjacent partitions are not affected. Then, the upper limit of the gray scale range is divided by the maximum value of the gray scale levels of the sub-pixels in the optical isolation partitions corresponding to three segmented backlights. Finally, the sub-light sources of the three segmented backlights respectively reduce the luminous intensity according to corresponding multipliers, and the gray scale levels of all the sub-pixels corresponding to the basic colors in the light isolation partition range are increased according to the corresponding multipliers, so that synchronous adjustment of the segmented backlight and the gray scale pattern is achieved.

Description

An energy-saving display method based on synchronous adjustment of color separation backlight and grayscale pattern based on optical isolation partition Technical Field

[0001] The present invention relates to the field of liquid crystal display technology, and in particular to an energy-saving display method based on synchronous adjustment of color separation backlight and grayscale pattern of optical isolation partitions. Background Art

[0002] Conventional liquid crystal displays use a backlight source to illuminate the entire display area of ​​the liquid crystal panel. Technical issues

[0003] When the display screen has both bright and dark areas, the overall backlight brightness must be set high enough to ensure the display effect of the bright areas. In this case, because the backlight source is used to illuminate the entire display area of ​​the LCD panel, the backlight brightness corresponding to the dark areas is the same as the backlight brightness corresponding to the bright areas, which will cause the dark areas to be too bright and the display to be white.

[0004] Using a high-brightness backlight to illuminate a low-grayscale dark image is compared to using a low-brightness backlight to illuminate a high-grayscale bright image. Although the final display results are the same, the former has the defect of wasting energy. Technical Solutions

[0005] The present invention aims to provide an energy-saving display method that synchronizes color backlighting and grayscale patterns based on optical isolation and zoning. With optical isolation and zoning, the simultaneous bright and dark portions of the displayed image can be processed separately without affecting each other. This synchronized adjustment of color backlighting and grayscale patterns can address the drawbacks of using a single backlight source to illuminate the entire display area of ​​a liquid crystal panel.

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

[0007] (1) First, an anti-scattering grid or a reflective cup array plate is installed on the array color backlight panel, and then an optical film and a liquid crystal panel are installed thereon to partition the liquid crystal display area, wherein any partition is optically isolated from other partitions; through 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.

[0008] (2) Then, when displaying the current partition, for the three basic colors of the colored light source within the optical isolation partition, find the maximum value of the grayscale level of all sub-pixels corresponding to this basic color within the optical isolation partition range, and divide the upper limit of the grayscale range of the LCD panel by the maximum value of the three above-mentioned sub-pixel grayscale levels to obtain three magnifications.

[0009] (3) Finally, the luminous intensity of the three color-separated backlight sub-light sources is reduced by the corresponding ratio, and at the same time, the grayscale level of all sub-pixels corresponding to the basic color within the light isolation partition is increased by the corresponding ratio. Because the color-separated backlight reduces the luminous intensity, energy consumption is saved. Beneficial effects

[0010] The technical effect of the present invention is that, by adopting the method of synchronously adjusting the color separation backlight and the grayscale pattern of the present invention, energy saving can be achieved without changing the display. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The accompanying figure shows a comparison of energy savings before and after using the method of synchronously adjusting the color separation backlight and grayscale pattern.

[0012] On the left is the method before using the color separation backlight and grayscale pattern synchronous adjustment. The sub-pixel grayscale level in the grayscale pattern of the LCD panel is low, but the backlight brightness of the three colors is very high.

[0013] The right side shows the method of using color separation backlight and grayscale pattern synchronous adjustment. The grayscale level of the sub-pixel in the grayscale pattern of the LCD panel is high, but the backlight brightness of the three colors is very low, achieving energy saving effect.

[0014] Reference numerals: 1: Grayscale scale value. 2: Sub-pixel grayscale distribution corresponding to the red sub-light source. 3: Sub-pixel grayscale distribution corresponding to the green sub-light source. 4: Sub-pixel grayscale distribution corresponding to the blue sub-light source. 5: Red sub-light source. 6: Green sub-light source. 7: Blue sub-light source. Best Mode for Carrying Out the Invention

[0015] Example 1:

[0016] 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.

[0017] (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.

[0018] (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.

[0019] (3) By collecting the VSYNC frame synchronization signal or the DE display data enable signal generated by the display video signal, the backlight control counter is triggered to record the video signal CLK clock cycle, which continues until the first row scan line of the next frame starts to update the display. The delay time is calculated based on the total number of video signal CLK clocks recorded during this period, the row scan line position is determined, and the color and brightness of the color light source in the corresponding optical isolation partition are updated.

[0020] (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.

[0021] (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

[0022] Example 2:

[0023] 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.

[0024] (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.

[0025] (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.

[0026] (3) Hardware low blue light is achieved by using blue LED chips with a main wavelength of 460nm.

[0027] (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.

[0028] (5) Use several backlight micro units to arrange into a complete color backlight.

[0029] (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%. Example

[0030] 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.

[0031] (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.

[0032] (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.

[0033] (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.

[0034] (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.

[0035] (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.

[0036] (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.

[0037] 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. Example

[0038] 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.

[0039] (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.

[0040] (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.

[0041] (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.

[0042] (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.

[0043] (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

[0044] The present invention resets the backlight brightness on the backlight panels at different positions and the corresponding pixel grayscale values ​​on the liquid crystal panel through a software algorithm, thereby achieving energy saving without changing the display. Sequence Listing Free Content

[0045] Unordered list.

Claims

1. An energy-saving display method based on light-isolated partitioning and synchronous adjustment of color backlight and grayscale pattern, 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 color backlight panel, and then an optical film and a liquid crystal panel are installed thereon to partition the liquid crystal display area, wherein any partition is optically isolated from other partitions. Through the optical isolation partition method, the color and brightness of the color light source in the partition can be adjusted independently without affecting other adjacent partitions. Then, when displaying the current partition, for the three basic colors of the color light source in the optical isolation partition, the maximum value of the grayscale level of all sub-pixels corresponding to this basic color within the optical isolation partition range is found, and the upper limit of the grayscale range of the liquid crystal panel is divided by the maximum value of the grayscale level of the three sub-pixels mentioned above to obtain three magnifications. Finally, the luminous intensity of the three color separation backlight sub-light sources is reduced according to the corresponding magnifications, and the grayscale level of all sub-pixels corresponding to this basic color within the optical isolation partition range is increased according to the corresponding magnifications. The color separation backlight and the grayscale pattern are adjusted synchronously to achieve the effect of energy saving without changing the display.

2. The method according to claim 1, characterized in that The colored light source is the three basic colors of red, green and blue, or the three basic colors of orange, green and blue, or the four basic colors of red, green, blue and orange.

3. The method according to claim 1, characterized in that The light isolation partition including the color light source and the isolation grid can be integrally manufactured on a silicon or glass substrate.

4. The method according to claim 1, characterized in that You can use white backlight without color separation, and use a magnification to adjust the backlight and grayscale pattern synchronously to achieve energy saving.

5. The method according to claim 1, characterized in that The ratio of synchronous adjustment of the color separation backlight and grayscale pattern within the current light isolation partition range can be smaller than the ratio calculated by dividing the upper limit of the grayscale range of the LCD panel by the maximum grayscale level of all sub-pixels corresponding to this basic color within the current light isolation partition range.

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