FFS Display Panel Sub-Pixel Layout for White Point Balance
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Solution Overview
Problem
In conventional liquid crystal display panels of Fringe Field Switching (FFS) mode, the transmittance decreases when Δnd<340 nm, leading to a bluish appearance on the white picture due to the lower transmittance of blue sub-pixels.
Innovation Solution
The transmissive area of the blue sub-pixel is reduced, while the transmissive areas of the red and/or green sub-pixels are increased, maintaining the same pixel area, to reduce the bluish appearance and enhance overall transmittance by adjusting the pixel electrode widths and branch electrode spacings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the transmittance of blue sub-pixels is reduced to achieve standard white point, then the bluish appearance is reduced, but the overall transmittance of the display panel decreases
Solution Approach 1:
The patent applies local quality by differentiating the transmissive area of blue sub-pixels from red and green sub-pixels. Specifically, the blue sub-pixel transmissive area is set to be smaller than the average transmissive area of all sub-pixels, while red and green sub-pixels have larger transmissive areas. This local differentiation compensates for the lower transmittance of blue sub-pixels and achieves the standard white point without significantly reducing overall transmittance.
Solution Approach 2:
The patent changes the parameter of transmissive area for different sub-pixel colors. By adjusting the transmissive area parameter - making blue sub-pixels smaller and red/green sub-pixels larger - the patent optimizes the color balance and achieves standard white point while maintaining acceptable overall transmittance.
2Ease of manufacture
If the transmissive area of blue sub-pixels is reduced to achieve standard white point, then the bluish appearance is reduced, but the pixel area allocation becomes asymmetric
Solution Approach 1:
The patent applies local quality by differentiating the transmissive area of blue sub-pixels from red and green sub-pixels. Specifically, the blue sub-pixel transmissive area is set to be smaller than the average transmissive area of all sub-pixels, while red and green sub-pixels have larger transmissive areas. This local differentiation compensates for the lower transmittance of blue sub-pixels and achieves the standard white point without significantly reducing overall transmittance.
Solution Approach 2:
The patent intentionally introduces asymmetry in sub-pixel transmissive area allocation. By making blue sub-pixels smaller and red/green sub-pixels larger, the patent accepts asymmetric area distribution as a necessary trade-off to achieve accurate white point, rather than maintaining symmetric area allocation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively reduces the risk of bluish appearance and enhances the overall transmittance of the display panel by optimizing the transmissive areas of the sub-pixels to achieve the standard white point.
Implementation Method 1
Δnd represents the multiplication result of the birefringence of the liquid crystal molecules and the thickness of the liquid crystal layer
Data Source
AI summary
A display panel includes a red sub-pixel, a green sub-pixel, and a blue sub-pixel. The transmittance of the blue sub-pixel is lower than that of the red sub-pixel and that of the green sub-pixel respectively. An average transmissive area is defined as an average value of the sum of the transmissive areas of the blue, red, and green sub-pixels. The transmissive area of the blue sub-pixel is less than the average transmissive area, the transmissive areas of the red and green sub-pixels are greater than or equal to the average transmissive area. The transmissive area of the red and the transmissive area of green sub-pixels are not simultaneously equal to the average transmissive area.