Touch Display Electrode Bending Patterns to Suppress Moire
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Solution Overview
Problem
Capacitive touch display apparatuses often suffer from moire patterns due to overlapping touch electrodes and pixel areas, which degrade the user experience.
Innovation Solution
The touch display apparatus features touch electrodes with bending patterns arranged at specific pitches and angles relative to the pixel areas, ensuring that the pixel pitch, first touch electrode pitch, and second touch electrode pitch satisfy specific ratios to effectively suppress moire pattern generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If touch electrodes are disposed above the display panel with periodic arrangement, then touch sensing function is achieved, but moire patterns are generated due to overlap with pixel areas
Solution Approach 1:
The patent introduces asymmetric bending patterns to the touch electrodes, where each bending pattern includes multiple line segments with different orientations. Specifically, the bending patterns contain first line segments extending in a first direction and second line segments extending in a second direction that is different from the first direction. This asymmetric configuration breaks the periodic symmetry between touch electrodes and pixel areas, thereby suppressing moire pattern generation while maintaining touch sensing functionality.
Solution Approach 2:
The patent applies curvature by designing the touch electrodes with bending patterns instead of straight lines. Each bending pattern consists of multiple line segments connected at angles, creating a curved or zigzag geometry. This curvature disrupts the regular periodic arrangement of touch electrodes, preventing the formation of moire patterns when overlapped with the periodic pixel areas of the display panel.
2Ease of manufacture
If touch electrodes are arranged with standard pitch, then manufacturing is simplified, but moire patterns occur due to alignment with pixel pitch
Solution Approach 1:
The patent changes the geometric parameters of the touch electrode arrangement by introducing bending patterns with specific angular relationships. The bending patterns include line segments oriented at different angles, and the pitch between adjacent bending patterns is controlled within specific ranges (e.g., 0.05Ppx to 0.2Ppx where Ppx is the pixel pitch). These parameter changes disrupt the harmful periodic alignment while maintaining manufacturability through standardized fabrication processes.
Data Source
AI summary
A touch display apparatus includes a display panel having pixel areas and touch electrodes disposed above the display panel. The pixel areas are arranged with a pixel pitch Ppx in a first direction. The touch electrodes have bending patterns arranged with a first touch electrode pitch Ptx in the first direction. Each bending pattern includes repeating portions connected with one another. The repeating portions are arranged with a second touch electrode pitch Pty in a second direction intersecting the first direction. Each repeating portion has a first line segment inclined with respect to the first direction and the second direction. An angle a is included between the first line segment and the second direction, and 10°≤α≤45°. The pixel pitch, the first touch electrode pitch and the second touch electrode pitch satisfy 1.5Ppx≤Ptx≤2Ppx and 1.63Ppx≤0.5Pty≤9.94Ppx.