Energy-saving display method for synchronous adjustment of color separation backlight and gray scale pattern based on light isolation partition

Abstract

The invention discloses an energy-saving display method for synchronous adjustment of color separation backlight and gray scale patterns based on light isolation partition. The light isolation subareas are used, so that the colors and the brightness of the color light sources in the subareas can be independently adjusted, and other adjacent subareas are not influenced; dividing the upper limit of the gray scale range by the maximum values of the gray levels of the sub-pixels in the light isolation partitions corresponding to the three color separation backlights to obtain three multiplying powers; the luminous intensity of the three color separation backlight photon light sources is reduced according to corresponding multiplying power, and meanwhile, the gray levels of all sub-pixels corresponding to the basic color in the light isolation partition range are increased according to corresponding multiplying power, so that synchronous adjustment of color separation backlight and gray-scale patterns is realized; and the energy-saving effect can be achieved under the condition that the display is not changed.

Description

Technical Field

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

[0002] Conventional liquid crystal display is a display method that uses a backlight source to illuminate the entire display area on the liquid crystal panel.

[0003] When the display screen has both bright and dark parts, in order to ensure the display effect of the bright part, the overall backlight brightness must be set large enough. At this time, because the backlight source is used to illuminate the entire display area on the LCD panel, the backlight brightness corresponding to the dark part is the same as the backlight brightness corresponding to the bright part, which will cause the dark part 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. Summary of the invention

[0005] The purpose of the present invention is to provide an energy-saving display method based on light isolation partitioning and synchronous adjustment of color separation backlight and grayscale pattern. After adopting light isolation partitioning, the bright part and dark part of the display screen that exist simultaneously can be processed separately without affecting each other. The method of synchronous adjustment of color separation backlight and grayscale pattern can solve the defect caused by the backlight light source irradiating the entire display area on the liquid crystal panel as a whole.

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

[0007] (1) First, an anti-scattering grid or a reflective cup array plate is installed on an array-type color backlight plate, 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 grayscale level of all sub-pixels corresponding to this basic color within the optical isolation partition, and divide the upper limit of the grayscale range of the LCD panel by the maximum grayscale levels of the three sub-pixels mentioned above to obtain three multipliers.

[0009] (3) Finally, the luminous intensity of the three color-separated backlight sub-light sources is reduced by the corresponding ratio, and 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.

[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] Attached Figure 1 The figure shows the energy saving comparison before and after using the method of synchronously adjusting the color separation backlight and grayscale pattern.

[0012] On the left is 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 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 value; 2: grayscale distribution of sub-pixels corresponding to the red sub-light source; 3: grayscale distribution of sub-pixels corresponding to the green sub-light source; 4: grayscale distribution of sub-pixels corresponding to the blue sub-light source; 5: red sub-light source; 6: green sub-light source; 7: blue sub-light source; DETAILED DESCRIPTION

[0015] Embodiment 1:

[0016] Embodiment 1 of the present invention provides a liquid crystal display method based on the principles of optical isolation and partitioning and time color mixing, which is described by taking a specific implementation as an example.

[0017] (1) When a 1600*1200 resolution, high refresh rate, non-color filter LCD panel is selected, a reflector array plate with 25 horizontal and 19 vertical reflectors is molded out using an iron-nickel-cobalt Kovar alloy plate having a thermal expansion coefficient close to that of the LCD panel, and is installed on a color LED backlight array plate, wherein each individual rectangular reflector in the reflector 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 luminescence 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 plate, and finally a high-refresh rate non-color filter liquid crystal panel is installed on the optical film. The liquid crystal display area can be partitioned by the reflective cup array plate, and any partition is optically isolated from other partitions. By using 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.

[0019] (3) By collecting the VSYNC frame synchronization signal or 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 frame image synthesis based on the principle of time color mixing is used as step C to complete the final color image display.

[0022] Embodiment 2:

[0023] Embodiment 2 of the present invention provides a method for achieving color backlight luminescence balance and improving luminous intensity, which can be applied to a liquid crystal display method based on the principle of light isolation partitioning and time color mixing provided in Embodiment 1 as a specific implementation of step A. In addition, this method for achieving color backlight luminescence balance and improving luminous intensity can also be performed independently to achieve the effect of increasing the driving current proportion of green and blue sub-light sources, and significantly improving the average driving current and luminous intensity of the sub-light sources. In this embodiment, the independent case is used as an example for description.

[0024] (1) Select 3030 packaged RGB-LED lamp as the red, green and blue light source, and use red LED chips to replace the blue LED chips as the red, green and red light sources. The maximum current limit of each chip is 20mA. When the red chip is given 18mA current, the green chip is given 13.5mA current, and the blue chip is given 4.5mA current, the RGB-LED lamp emits white light with a color temperature of 6500K, with an average current of 12mA per chip and an average luminous intensity of 2.85cd per LED lamp.

[0025] (2) A backlight micro-unit is composed of two red, green and blue light sources and two red, green and red light sources arranged alternately, wherein the ratio of the number 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, in accordance with the method of using all red, green and blue light sources, a single backlight micro-unit with 4 RGB-LED lamps has an average current of 12mA per chip and a luminous intensity of 11.4cd per backlight micro-unit; in a single backlight micro-unit with 2 red, green and blue light sources and 2 red, green and red light sources, the red chip has an 18mA current, the green chip has a 20mA current and the blue chip has a 13.5mA current, the average current per chip is 18mA and the luminous intensity of 17.1cd per backlight micro-unit; experiments have shown that this method of achieving color backlight luminescence balance and improving 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%.

[0030] Embodiment three:

[0031] Embodiment 3 of the present invention provides an energy-saving display method for synchronously adjusting the color separation backlight and grayscale pattern based on optical isolation partitions, which can be applied to a liquid crystal display method based on optical isolation partitions and time mixing principles provided in Embodiment 1 as a specific implementation of step B. In addition, this energy-saving display method for synchronously adjusting the color separation backlight and grayscale pattern based on optical isolation partitions can also be performed independently, and the color separation backlight and grayscale pattern are synchronously adjusted to achieve energy saving without changing the display. In this embodiment, the independent case is used as an example for explanation.

[0032] (1) When selecting a 1600*1200 resolution LCD panel, use an iron-nickel-cobalt Kovar alloy sheet with a thermal expansion coefficient close to that of the LCD panel to mold a reflective cup array board with 25 horizontal and 19 vertical reflective cups, which are installed on the color LED backlight array board. Each individual rectangular reflective cup in the reflective cup array board covers a display area of ​​64*64 pixels. Then install optical films such as diffusion films, BEF prism films, DBEF birefringent films, etc. with light-homogenizing and brightening effects on the molded reflective cup array board, and finally install the LCD panel on the optical film. The LCD display area can be partitioned by the reflective cup array board, and any partition is optically isolated from other partitions. By using 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.

[0033] (2) The main controller inside the display decodes the video signal sent by the host to the display and separates the 64*64 pixel color display image corresponding to each reflector cup in the next frame. Then the maximum grayscale level of the sub-pixel corresponding to the sub-light source in the optical isolation partition is found. 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.

[0034] (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.

[0035] (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. A 100% brightness backlight is used to illuminate a 64*64 grayscale pattern with a grayscale level of 0-127. The display effect is the same as that of a 50% brightness backlight to illuminate a 64*64 grayscale pattern with a grayscale level of 0-255. Therefore, by synchronously adjusting the color separation backlight and the grayscale pattern, a 50% energy saving effect can be achieved without changing the display.

[0036] (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.

[0037] (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%. A 100% brightness backlight is used to illuminate a 64*64 grayscale pattern with a grayscale level of 0-192. The display effect is the same as that of a 75% 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 25% energy saving effect can be achieved without changing the display.

[0038] Taking various situations into consideration, the use of this energy-saving display method based on light-isolated partitioning, color-separated backlight and synchronous adjustment of grayscale patterns can save energy by an average of about 50% while maintaining the display unchanged.

[0039] Embodiment 4:

[0040] Embodiment 4 of the present invention provides a display method for pre-filled light subtraction frame image synthesis based on the principle of time color mixing, which can be applied to a liquid crystal display method based on light isolation partition and time color mixing principle provided in embodiment 1 as a specific implementation of step C. In addition, this display method for pre-filled light subtraction frame image synthesis based on the principle of time color mixing can also be performed independently, so that the original method of using the principle of time color mixing to continuously display three subframes in a cycle to reproduce the original color image can be reduced to only 1-2 frames to reproduce the original color image. In this embodiment, the independent case is taken as an example for explanation.

[0041] (1) The main controller inside the display decodes the video signal sent by the host to the display and separates the next frame of 64*64 pixel color display. The image content is a golden sun with purple eyes.

[0042] (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.

[0043] (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.

[0044] (4) The pre-fill light frame-reduction image synthesis method of the present invention is adopted. In the first subframe of the current display cycle, 100% green light is used to illuminate the sun-shaped grayscale pattern, and the green monochrome image is fully displayed. At the same time, 100% red light is used for pre-fill light, illuminating the sun-shaped grayscale pattern, and part of the red monochrome image is displayed. At the same time, the calculation result shows that the sun-shaped grayscale pattern is independent of blue, and the blue light brightness is 0 and no pre-fill light is performed. Assuming that the content of the picture is a golden sun image, it is only necessary to illuminate the sun-shaped grayscale pattern with (green light + red light) to display the golden sun, and the original golden sun image can be reproduced with only one subframe. (5) The pre-fill light frame-reduction image synthesis method of the present invention is adopted. In the second subframe of the current display cycle, 100% red light is used to illuminate the eye-shaped grayscale pattern, and the red monochrome image is fully displayed together with the sun-shaped grayscale pattern already displayed in the first subframe. At the same time, 100% blue light is used for pre-fill light, illuminating the eye-shaped grayscale pattern, and a blue monochrome image is displayed. The first subframe has already displayed a golden sun. To further display a golden sun with purple eyes, one only needs to use (red light + blue light) in the second subframe to illuminate the eye-shaped grayscale pattern. The original golden sun image with purple eyes can be reproduced using only two subframes.

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-type color backlight plate, and then an optical film and a liquid crystal panel are installed thereon, so as 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; 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 the 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 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 the basic color within the optical isolation partition range is increased according to the corresponding magnifications, and 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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