Method for improving brightness of liquid crystal projector

Abstract

The invention discloses a method for improving the brightness of a liquid crystal projector, and the method specifically comprises the following steps: 1, enabling a pixel point to be composed of three sub-pixel points, increasing the area proportion of a green light sub-pixel in the pixel, and reducing the area proportion of a red light sub-pixel and a blue light sub-pixel; step 2, reducing the ratio of green light in the light source and increasing the ratio of red light and blue light in the light source under the condition that the illumination light source does not accord with the RGB ratio of white light and the total light energy is not changed; and 3, respectively multiplying the RGB proportions by the corresponding sub-pixel areas to obtain a result which accords with the RGB proportions during white balance. According to the invention, by changing the luminosity of the pixel points and the RGB, more light rays can penetrate under the condition of the same light energy density, so that the method becomes an important method for improving the brightness of the liquid crystal projector.

Description

Technical Field

[0001] The invention relates to the field of projectors, and in particular to a method for improving the brightness of a liquid crystal projector. Background Art

[0002] Brightness is an important parameter of a projector. Due to the low transmittance of LCD screens, most of the light is converted into heat energy, and the temperature resistance of LCD screens is poor, which limits the energy density of the light on the LCD screen. Therefore, under the same light energy density, being able to transmit more light becomes an important method to increase the brightness of LCD projectors. A pixel of a conventional LCD screen is composed of three sub-pixels. The color temperature of white light is 7000K, and the composition of its RGB three-color light is B 5.8%, G 73.3%, and R 20.9%. Figure 1 As shown, a pixel of a conventional LCD screen is composed of three sub-pixels, such as Figure 2 As shown, the area of ​​each sub-pixel is the same. Each sub-pixel can only transmit light of the corresponding color. Without considering other factors, the light transmitted by each pixel is equal to the sum of the light transmitted by the three sub-pixels, which satisfies the following formula Pixel transmittance = B sub-pixel area (1 / 3) * B light proportion (5.8%) + G sub-pixel area (1 / 3) * G light proportion (73.3%) + R sub-pixel area (1 / 3) * R light proportion (20.9%) = 33.33%. Summary of the invention

[0003] The technical problem to be solved by the present invention is a method for improving the brightness of a liquid crystal projector. By changing the luminance of pixels and RGB, more light can be transmitted under the same light energy density, which becomes an important method for improving the brightness of a liquid crystal projector. The present invention is realized by the following technical scheme: a method for improving the brightness of a liquid crystal projector, specifically comprising the following steps: Step 1: One pixel is composed of three sub-pixels, increasing the area ratio of the green sub-pixel in the pixel and reducing the area ratio of the red and blue sub-pixels; Step 2: The lighting source does not follow the RGB ratio of white light. When the total light energy remains unchanged, the proportion of green light in the light source is reduced, and the proportion of red light and blue light in the light source is increased; Step 3: Multiply the RGB ratio by the corresponding sub-pixel area, and the result is consistent with the RGB ratio during white balance. As a preferred technical solution, the proportion of red light is reduced to increase brightness while allowing for a reduction in image quality. As a preferred technical solution, under the condition that the image quality can be further reduced, sub-pixel merging is performed, and the sub-pixels are arranged in the order of GR GB GR GB. As a preferred technical solution, when merging sub-pixels, in the first frame, odd-numbered pixels display three sub-pixels of RGB, and even-numbered pixels only display one sub-pixel of G. In the second frame, odd-numbered pixels display only one sub-pixel of G, and even-numbered pixels display only three sub-pixels of RGB, and so on. The beneficial effect of the present invention is that the present invention can transmit more light by changing the luminance of pixel points and RGB under the condition of the same light energy density, and becomes an important method for improving the brightness of liquid crystal projectors. BRIEF DESCRIPTION OF THE DRAWINGS

[0004] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work. Figure 1 This is a light proportion diagram of conventional RGB three-color light in the prior art; Figure 2 is a ratio diagram of sub-pixels in the prior art; Figure 3 This is a sub-pixel ratio diagram after improvement of the present invention; Figure 4 This is a diagram showing the proportion of the RGB three-color light after improvement of the present invention. DETAILED DESCRIPTION

[0005] All features disclosed in this specification, or steps in all methods or processes disclosed, except mutually exclusive features and / or steps, can be combined in any manner. Any feature disclosed in this specification (including any additional claims, abstract and drawings), unless otherwise stated, may be replaced by other equivalent or alternative features with similar purposes. That is, unless otherwise stated, each feature is only an example of a series of equivalent or similar features. Example 1 like Figure 1 As shown, a method of improving the brightness of a liquid crystal projector of the present invention increases the area proportion of green light sub-pixels in pixels, reduces the area proportions of red and blue light sub-pixels, and simultaneously reduces the area proportion of green light in the light source and increases the area proportions of red and blue light in the light source. For example: increase the green light sub-pixel area to 2 / 3 of the pixel area, and reduce the red and blue light areas to 1 / 6 of the pixel area. Figure 3As shown, adjust the light source composition at the same time, double the proportion of red and blue, such as: red accounts for 41.8%, green accounts for 46.6%, and blue accounts for 11.6%. Figure 4 shown. Then the transmittance of the total new pixel = 1 / 6*11.6%+2 / 3*46.6%+1 / 6*41.8%=39.96%, the ratio of each color light passing through the LCD screen remains: 5.8:73.3:20.9, and the color temperature remains unchanged. Transmittance: New pixel / conventional pixel = 39.96% / 33.33% = 120%, the transmittance increased by 20%. Example 2 Furthermore, because human vision is less sensitive to red, the lack of red has little effect on the image quality and only affects the color rendering index. Therefore, in areas where color reproduction is not required, the brightness can be further improved by sacrificing the red image quality. Because the eyes are sensitive to green but not red, under the same brightness, the color temperature of the picture will increase and the visual perception will be brighter. For example: the proportion of red is reduced from 41.8% to 20.9%, the composition of RGB is B 15.89%, G 63.92%, R 20.9%, the total transmittance of the new pixel = 1 / 6*15.89%+2 / 3*63.92%+1 / 6*20.9%=48.75%; Transmittance: New pixel / conventional pixel=48.75%% / 33.33%=162.5%. Transmittance increased by 62.5%. Example 3 Furthermore, in human vision, green light is the most sensitive, and the sensitivity to red light and blue light is much lower. Therefore, the actual resolution is determined by the number of green sub-pixels. The effects of red light and blue light are mainly reflected in color. Therefore, as long as the number of green sub-pixels is guaranteed, the resolution is basically guaranteed. The sub-pixel arrangement order of conventional LCD screens is: RGB RGB RGB RGB in sequence. The sub-pixel arrangement order of the LCD screen of the present invention is: RGB BGR RGB BGR. Because the R or B sub-pixel is the same as the adjacent pixel, it can be merged when the image quality requirement is not particularly high. After merging, it is GB GR GB GR, and the number of sub-pixels is reduced by 1 / 3. Because the wires and TFT structures in the LCD screen occupy about 45% of the area of ​​the LCD screen, and the wires and TFT structures are opaque, if 1 / 3 of the sub-pixels are reduced, the opaque area can be reduced by 1 / 3*45%=15%. The corresponding light-transmitting area will increase from 55% to 70%, and the transmittance will increase: 70% / 55%=127.27%. By superimposing Example 1, the transmittance is increased to 120%*127.27%=152.72%, and the transmittance is increased by 52.72%; Superimposed with Example 2, the transmittance is increased to 152.72%*127.27%=206.81%, and the transmittance is increased by 106.81%. The display method of two adjacent pixels of the conventional LCD screen is: RGB RGB RGB in the first frame, and RGB RGB RGB in the second frame. The display method of two adjacent pixels after merging the RB sub-pixels is: RGB G RGB G in the first frame, and G BGR G BRG in the second frame. That is, in the first frame, the odd-numbered pixels have three sub-pixels of RGB, and the even-numbered pixels only display one sub-pixel of G. In the second frame, the odd-numbered pixels have one sub-pixel of G, and the even-numbered pixels only display three sub-pixels of RGB, and so on. The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that are not conceived through creative work should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope defined in the claims.

Claims

1. A method for improving the brightness of a liquid crystal projector, characterized in that: The specific steps include the following: Step 1: One pixel is composed of three sub-pixels, increasing the area ratio of the green sub-pixel in the pixel and reducing the area ratio of the red and blue sub-pixels; Step 2: The lighting source does not follow the RGB ratio of white light. When the total light energy remains unchanged, the proportion of green light in the light source is reduced, and the proportion of red light and blue light in the light source is increased; Step 3: Multiply the RGB ratio by the corresponding sub-pixel area, and the result is consistent with the RGB ratio during white balance.

2. The method for improving the brightness of a liquid crystal projector according to claim 1, characterized in that: While allowing for reduced image quality, reduce the proportion of red light to increase brightness.

3. The method for improving the brightness of a liquid crystal projector according to claim 1, characterized in that: In the case where the image quality is further allowed to be reduced, sub-pixel merging is performed, and the sub-pixels are arranged in the order of GR GB GR GB.

4. The method for improving the brightness of a liquid crystal projector according to claim 3, characterized in that: In the case of merging sub-pixels, in the first frame, odd-numbered pixels display three sub-pixels of RGB, and even-numbered pixels only display one sub-pixel of G. In the second frame, odd-numbered pixels display only one sub-pixel of G, and even-numbered pixels display only three sub-pixels of RGB, and so on.

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