Touch Display Panel Metal Mesh Holes for Cross-Color Control
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Solution Overview
Problem
Existing touch display panels face issues with non-uniform sub-pixel intervals leading to metal lines obstructing light emission, causing cross-color effects and display defects, particularly when sub-pixels with close intervals are adjacent.
Innovation Solution
The design includes a touch display panel with a base substrate and a touch structure where the orthographic projection of mesh holes of metal meshes cover adjacent sub-pixels, ensuring sufficient distance from pixel opening regions, particularly for sub-pixels emitting the same color, thereby avoiding display interference and simplifying manufacturing through shared light-emitting layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal lines are arranged to connect sub-pixels with close intervals, then touch electrode connectivity is improved, but light emission is obstructed causing cross-color effects and display defects
Solution Approach 1:
The touch electrode is segmented into multiple metal meshes with mesh holes positioned at sub-pixel locations. This segmentation allows light to pass through the mesh holes while maintaining electrode connectivity through the metal mesh structure, resolving the conflict between connectivity and light emission.
Solution Approach 2:
The mesh hole structure acts as an intermediary element between the metal line and the sub-pixel opening. It allows the metal line to maintain its connectivity function while permitting light to pass through, thereby eliminating the cross-color effect caused by direct metal line obstruction.
2Adaptability or versatility
If sub-pixels are arranged with non-uniform intervals to optimize display, then display flexibility is improved, but metal lines must pass close to pixel openings causing display defects
Solution Approach 1:
By segmenting the continuous metal line into a mesh structure with holes at sub-pixel positions, the design maintains adaptability to non-uniform sub-pixel intervals while eliminating light obstruction. The mesh structure can be flexibly configured to match various sub-pixel arrangements without causing cross-color effects.
Solution Approach 2:
The mesh structure provides different local properties: solid metal regions for electrical connectivity and hollow mesh holes for light transmission. This local differentiation allows the electrode structure to adapt to non-uniform sub-pixel intervals while maintaining both connectivity and preventing light obstruction.
3Illumination intensity
If metal lines are positioned outside pixel opening regions, then light emission is improved, but touch electrode coverage and sensitivity are reduced
Solution Approach 1:
The touch electrode transitions from a two-dimensional planar metal line to a three-dimensional mesh structure with vertical holes. This dimensional change allows the electrode to cover the entire sub-pixel area while maintaining light transmission through the holes, thereby improving both light emission quality and electrode coverage simultaneously.
Solution Approach 2:
The mesh structure functions as a porous electrode material that allows light to pass through while maintaining electrical conductivity. The porous structure enables the electrode to cover the full sub-pixel area without obstructing light emission, resolving the trade-off between coverage and light quality.
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.