Blue Sub-Pixel Charging Rate Adjustment for LCD Color Shift
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Solution Overview
Problem
Liquid-Crystal-Display (LCD) panels using the vertical alignment mode suffer from significant color shift and yellowish picture issues due to differences in birefringence of liquid crystal molecules, particularly caused by lower brightness of blue sub-pixels leading to uneven color representation.
Innovation Solution
The display panel design includes a grid arrangement of scan lines and data lines with blue sub-pixels having a higher charging rate than red and green sub-pixels, utilizing two data lines for blue sub-pixels to enhance data signal reception and improve brightness, thereby addressing the color shift and brightness issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If vertically rotating liquid crystal is adopted in the vertical alignment mode, then high contrast and wide viewing angle are achieved, but color shift and yellowish picture occur due to large birefringence difference
Solution Approach 1:
The patent applies local quality by differentiating the charging rates for different color sub-pixels. Specifically, the blue sub-pixel is configured with a higher charging rate than the red and green sub-pixels, compensating for the inherently lower brightness of blue sub-pixels in vertical alignment mode LCDs. This localized parameter adjustment ensures uniform color output across all sub-pixels without requiring complex manufacturing process changes.
2Ease of manufacture
If blue sub-pixels have lower brightness due to birefringence differences, then vertical alignment mode can be used, but color shift and yellowish picture occur
Solution Approach 1:
The patent employs parameter changes by adjusting the charging rate parameter specifically for blue sub-pixels. The charging rate of blue sub-pixels is increased relative to red and green sub-pixels, which compensates for the lower brightness caused by birefringence differences in vertical alignment mode. This parameter adjustment is implemented through the display driver circuit, allowing the system to maintain the simplicity of vertical alignment mode while achieving uniform color brightness.
3Device complexity
If uniform charging rate is applied to all sub-pixels, then manufacturing is simplified, but blue sub-pixel brightness remains insufficient causing color shift
Solution Approach 1:
The patent implements local quality by assigning different charging rates to different color sub-pixels based on their specific brightness characteristics. The blue sub-pixel is configured with a higher charging rate to compensate for its lower inherent brightness, while red and green sub-pixels use a standard charging rate. This differentiated approach maintains relatively simple device structure while effectively solving the blue sub-pixel brightness deficiency and resulting color shift issues.
Data Source
AI summary
A display panel, a display module, and a display device are provided. The display panel includes multiple pixel units arranged in an array. Each of the multiple pixel units includes sub-pixels emitting lights of three colors. Multiple sub-pixels are arranged in rows in a first direction, and sub-pixels emitting lights of a same color are arranged in columns. In any pixel unit of the array, the third-color sub-pixel has a charging rate higher than each of the first-color sub-pixel and the second-color sub-pixel.