Liquid Crystal Display Panel Sub-Pixel Color Resist Design
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Solution Overview
Problem
Color shift in liquid crystal display panels due to different materials of color resists causing varying offsets in thin film transistors under high temperature and humidity conditions, leading to reddish/greenish color distortion.
Innovation Solution
A liquid crystal display panel design with each pixel area having three sub-pixel areas, each equipped with a light-emitting area and a circuit area, using sub-color resists where the secondary color resists are the same across all sub-pixel areas of a pixel, covering both the light-emitting and thin film transistor areas, to minimize characteristic offset differences and prevent color shift.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If different color resists are used for different sub-pixel areas, then color filtering function is achieved, but thin film transistor characteristic offsets occur under high temperature and humidity conditions
Solution Approach 1:
The color resist is divided into two functional segments: a first color resist covering the light-emitting area for color filtering, and a second color resist covering the circuit area for protecting thin film transistors. This segmentation allows each segment to serve its specific function independently, preventing the second color resist from causing characteristic offsets in the thin film transistors while maintaining the color filtering function of the first color resist.
Solution Approach 2:
Different regions of the display panel are assigned different color resist materials based on their specific requirements. The light-emitting area uses color resist optimized for color filtering performance, while the circuit area uses color resist optimized for minimizing impact on thin film transistor characteristics. This local optimization resolves the contradiction between color filtering effectiveness and transistor reliability.
2Ease of operation
If color resists are used to provide backlight and spatial color mixing, then display function is achieved, but color shift occurs under high temperature and humidity conditions
Solution Approach 1:
The color resist structure is segmented into a first color resist for color filtering in the light-emitting area and a second color resist for circuit protection in the circuit area. This segmentation ensures that the color filtering function is maintained for display performance while the second color resist is specifically designed not to cause characteristic offsets that would lead to color shift under high temperature and humidity conditions.
Solution Approach 2:
The patent changes the material parameters of the color resist in the circuit area to have different properties compared to conventional color resists. The second color resist is specifically formulated to minimize its impact on thin film transistor electrical characteristics, thereby preventing the characteristic offsets and subsequent color shift that would otherwise occur under high temperature and humidity conditions while maintaining normal display function.
Data Source
AI summary
The present application discloses a liquid crystal display panel and a display device. In the liquid crystal display panel, a sub-pixel area includes a light-emitting area and a circuit area connected to the light-emitting area. Each of sub-pixel driving circuits is correspondingly disposed in a circuit area, and each of the sub-pixel driving circuits includes at least one thin film transistor. At least three sub-color resists of a same color resist are respectively arranged in at least three sub-pixel areas of a same pixel area. Colors of secondary color resists of the at least three sub-color resists arranged in the same pixel area are same.