Liquid Crystal Display Luminance Control via Color Mixing
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Solution Overview
Problem
Liquid crystal display devices face challenges in maintaining contrast and reducing power consumption, especially in high-illuminance environments, as existing solutions either increase power consumption or limit image quality and pixel definition.
Innovation Solution
The method involves sensing outdoor light illuminance and converting image signals to increase luminance by mixing other colors with predetermined colors, allowing for enhanced contrast and reduced power consumption without increasing pixel area, using a liquid crystal display panel with a TFT substrate and counter substrate, and an IC driver to adjust luminance and chromaticity data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the brightness of backlight is increased to create visible contrast in high-illuminance environments, then the contrast is improved, but the power consumption increases
Solution Approach 1:
The patent changes the chromaticity parameters of the backlight by mixing multiple color filters (red, green, blue) in specific ratios to create a yellowish-white light with higher luminance. This parameter change allows the backlight to achieve better visibility and contrast in high-illuminance environments without increasing power consumption, as the mixed color composition provides higher luminance efficiency
2Illumination intensity
If white pixel is added to red, green and blue pixels to increase luminance, then the luminance is improved, but the area of unit pixel increases
Solution Approach 1:
The patent merges multiple color filters (red, green, blue) within a single pixel structure to create a multi-color pixel that can emit yellowish-white light. Instead of adding a separate white pixel, the invention combines the functionality of multiple color filters to achieve both color reproduction and high luminance output from the same pixel area, thus avoiding the increase in unit pixel area
3Illumination intensity
If first color filter with high color purity and second color filter with high transmittance are arranged side by side, then the color purity and transmittance are improved, but the pixel definition is limited
Solution Approach 1:
The patent segments the color filter structure into multiple independent color filter regions (red, green, blue) within a single pixel, each with optimized properties. By controlling the area ratios of these segmented color filters, the invention achieves both high color purity and high transmittance while maintaining sharp pixel definition, as each segment can be precisely controlled during manufacturing
Data Source
AI summary
Under a normal environment, when red, green and blue displays are to be performed, the displays are performed singly by a red pixel, a green pixel and a blue pixel respectively, and under a high-illuminance environment, when the red display is to be performed, the display is performed by also shining the pixels other than the red pixel simultaneously, when the green display is to be performed, the display is performed by also shining the pixels other than the green pixel simultaneously, and when the blue display is to be performed, the display is performed by also shining the pixels other than the blue pixel simultaneously, thereby increasing the luminance of a screen. In this case, although the chromaticity of each color is lowered, since the luminance works more predominantly on the image quality under the high-illuminance environment than the chromaticity, image quality degradation does not occur.