Touch Electrode Mesh Layout for OLED Shadow Elimination
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Solution Overview
Problem
Existing touch electrode structures in display panels, particularly in OLED displays, suffer from issues such as cross-color interference and reduced pixel aperture ratio due to non-uniform sub-pixel spacing, which affects display quality and manufacturing complexity.
Innovation Solution
A touch display panel design where adjacent sub-pixels with the same color share a mesh hole, ensuring metal lines are outside pixel opening regions, and the metal mesh is arranged to maintain sufficient distance from pixel openings, thereby avoiding cross-color interference and improving display quality while simplifying manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal lines are placed to cover pixel opening regions, then touch electrode coverage is improved, but light emission is obstructed and display quality deteriorates
Solution Approach 1:
The pixel opening regions are segmented by color (red, green, blue sub-pixels), and metal lines are selectively arranged to cover only specific color regions (e.g., metal lines for red sub-pixels do not cover green or blue sub-pixel opening regions). This segmentation allows the touch electrode structure to maintain coverage while preventing cross-color interference and preserving light emission for each sub-pixel.
2Manufacturing precision
If sub-pixel spacing is reduced to increase pixel density, then display resolution is improved, but manufacturing precision requirements increase and complexity increases
Solution Approach 1:
Different spacing intervals are applied to different color sub-pixels. Specifically, first sub-pixels of the same color (e.g., red sub-pixels) are spaced at a first interval, while sub-pixels of different colors (e.g., red and green) are spaced at a second interval that is larger than the first. This local quality approach allows increased pixel density for same-color sub-pixels while maintaining sufficient spacing for manufacturing precision across different colors.
3Reliability
If metal mesh density is increased to improve touch sensitivity, then touch sensitivity is improved, but cross-color interference increases and display quality deteriorates
Solution Approach 1:
The metal mesh is segmented by color channels, where metal lines associated with red sub-pixels are positioned to avoid green and blue sub-pixel opening regions, and vice versa. This segmentation enables high mesh density for improved touch sensitivity while preventing cross-color interference by ensuring that metal lines for one color do not obstruct light emission from other color sub-pixels.
Data Source
Figure 1A
Figure 1B
Figure 1C~1D
AI summary
A touch structure, a touch display panel and an electronic device are provided. The touch structure includes multiple first touch sub-electrodes and second touch sub-electrodes. Multiple first metal lines in a boundary region between adjacent first and second touch sub-electrodes respectively include multiple spaces; each space divides a first metal line, where it is located, into two first metal line segments to insulate the adjacent first and second touch sub-electrodes. The spaces include multiple first spaces which are in a first line and respectively on multiple first metal lines intersecting with the first line that is substantially extended along a certain direction. Between at least two first spaces is provided with at least one first metal line intersecting the first straight line, and no space is at an intersection of the each one first metal line and the first line. The touch structure has a good effect of shadow elimination.