Display Panel Signal Line Spacing for Color Shift and Light Leakage
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Solution Overview
Problem
Touchscreen technologies in display panels suffer from issues such as color shift, light leakage in a dark state, and contrast ratio degradation at front and lateral viewing angles due to signal lines disposed in the pixel array layer.
Innovation Solution
A display panel design with a specific configuration of signal lines and color resists, where signal lines are not disposed at every color resist boundary, and intervals between signal lines correspond to a specific number of color resists, avoiding reflection-related issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If signal lines are disposed in the pixel array layer at every color resist boundary, then touch sensor functionality is achieved, but color shift occurs at lateral viewing angles due to reflections from the signal lines
Solution Approach 1:
The patent extracts the harmful signal lines from their conventional positions at every color resist boundary. Specifically, signal lines are removed from positions where they would cause harmful reflections, while maintaining necessary touch sensor functionality through alternative signal line configurations that do not intersect with color resist boundaries in problematic ways.
Solution Approach 2:
The patent applies different arrangements of signal lines in different regions of the display panel. Instead of uniform signal line placement, the design uses local variations in signal line positioning and spacing to optimize both touch functionality and optical performance, avoiding reflections that cause color shift while maintaining sensor capability.
2Adaptability or versatility
If signal lines are disposed in the pixel array layer, then touch sensor functionality is achieved, but light leakage occurs in dark state and contrast ratio degrades at front and lateral viewing angles
Solution Approach 1:
The patent removes signal lines from positions where they generate harmful light leakage and contrast degradation. By extracting signal lines from specific locations in the pixel array layer, the design eliminates the source of these harmful effects while preserving touch sensor functionality through reconfigured signal line paths.
Solution Approach 2:
The patent repositions signal lines in the vertical dimension (different layers or depths) or changes their spatial arrangement in ways that move them away from problematic intersections with color resists and pixel boundaries, thereby reducing optical interference while maintaining electrical functionality.
3Adaptability or versatility
If signal line density is increased to improve touch sensor resolution, then touch functionality is enhanced, but color shift and light leakage problems worsen
Solution Approach 1:
The patent uses non-uniform signal line spacing and positioning to achieve high touch resolution without causing harmful reflections. By concentrating signal lines in certain areas and spacing them out in others, the design maintains sensor resolution while avoiding the specific configurations that cause color shift and light leakage.
Solution Approach 2:
The patent employs asymmetric signal line arrangements that break the symmetry of conventional grids. This asymmetric positioning prevents regular reflection patterns that cause color shift, while still providing sufficient signal line density for high-resolution touch sensing through strategic placement rather than uniform distribution.
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
The design prevents color shift and light leakage, enhancing contrast ratio by reducing signal line density, resulting in improved performance at both front and lateral viewing angles.
Implementation Method 1
The color resist layer is disposed on the pixel array layer and includes a plurality of pixel units. Each of the plurality of pixel units includes a plurality of color resists. The first color resist, the second color resist, and the third color resist are different in color.
Data Source
AI summary
A display panel including a pixel array layer and a color resist layer. The pixel array layer is disposed on a substrate and includes a plurality of signal lines arranged along a direction. The color resist layer includes a plurality of pixel units. The pixel units are sequentially arranged along the direction, and each pixel unit includes a first color resist, a second color resist and a third color resist. Each signal line corresponds to a boundary between the first color resist and the second color resist, a boundary between the second color resist and the third color resist, or a boundary between the third color resist and the first color resist. An interval between two adjacent signal lines corresponds to N color resists, wherein N is a positive integer greater than 1 and is not a multiple of 3.