Touch Display Panel Mesh-Hole Layout for Cross-Color Reduction
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Solution Overview
Problem
Existing touch display panels face issues with metal lines in the metal mesh affecting display functions, such as blocking light and causing cross-color effects due to non-uniform sub-pixel intervals, particularly when sub-pixels emit the same color.
Innovation Solution
The solution involves arranging metal lines outside pixel opening regions and sharing mesh holes between sub-pixels emitting the same color, ensuring sufficient distance from pixel openings, and optimizing metal line widths and gaps to prevent interference with light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If metal lines are arranged in the pixel opening regions, then the touch electrode structure can be simplified, but light is blocked and cross-color effects occur
Solution Approach 1:
The patent extracts the metal lines from the pixel opening regions and relocates them to the pixel spacing regions. This separation removes the harmful effect of light blocking while preserving the touch electrode functionality. The metal lines are taken out from where they cause harm (pixel openings) and placed in a safe location (pixel spacing regions).
Solution Approach 2:
The patent utilizes the spatial dimension by arranging metal lines in the pixel spacing regions rather than within pixel opening regions. This dimensional repositioning allows the touch electrode structure to coexist with the light-emitting sub-pixels without interference, solving the contradiction between structural simplification and light emission quality.
2Manufacturing precision
If sub-pixels emitting the same color are placed closer together, then the display resolution is improved, but metal lines cause cross-color effects
Solution Approach 1:
The patent extracts the metal lines from the pixel opening regions where they cause cross-color effects, and relocates them to the pixel spacing regions. This removal from the harmful location eliminates the cross-color interference while allowing sub-pixels to be arranged closely for high resolution.
Solution Approach 2:
The patent applies different spatial arrangements to different regions: metal lines are placed in pixel spacing regions while sub-pixels are arranged in pixel opening regions. This local differentiation allows close sub-pixel spacing for high resolution without the harmful effect of metal lines causing cross-color effects.
3Reliability
If metal line width is increased to improve touch sensitivity, then touch detection is enhanced, but light blocking and cross-color issues worsen
Solution Approach 1:
The patent extracts the metal lines from the pixel opening regions and places them in the pixel spacing regions. This allows the metal lines to be made wider for improved touch sensitivity without blocking light from the sub-pixels, as they are now located in regions where they cannot interfere with light emission.
4Illumination intensity
If different metal line arrangements are used for each sub-pixel color, then display quality is improved, but manufacturing complexity increases
Solution Approach 1:
The patent merges the metal line arrangement strategy by placing all metal lines in the pixel spacing regions regardless of sub-pixel color. This unified approach simplifies manufacturing while still achieving high display quality, as the metal lines are positioned in a location that does not interfere with any sub-pixel's light emission.
Data Source
Figure 1A
Figure 1B
Figure 1C~1D
AI summary
A touch display panel, includes: a base substrate, and a display structure and a touch structure that are stacked on the base substrate, the touch structure includes a first metal mesh layer, an orthographic projection of a mesh hole of at least one first metal mesh of the first metal mesh layer on the base substrate covers orthographic projections of two pixel opening regions of two adjacent sub-pixels on the base substrate, and the two adjacent sub-pixels are configured to emit light of a first primary color; and a center distance between two pixel opening regions is smaller than a center distance between two pixel opening regions of two sub-pixels emitting light of same one other primary color, which is different to the first primary color. The touch display panel has a good display effect.