Touch Electrode Angles Prevent Moire Patterns in High PPI Displays
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Solution Overview
Problem
As display panels with higher PPI (Pixels Per Inch) are developed, the size of sub-pixel units decreases, leading to interference from common touch electrode patterns that generate moire patterns, affecting the yield of the display panel.
Innovation Solution
A touch electrode structure is designed with first and second touch electrodes forming angles of 20 to 25 degrees with their respective directions, avoiding interference with sub-pixel unit arrays and eliminating moire patterns by optimizing both electrical and optical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If common touch electrode patterns are used, then touch functionality is achieved, but moire patterns are generated affecting display quality
Solution Approach 1:
The patent applies asymmetry by designing touch electrode edges with specific asymmetric angles (20-25 degrees) relative to the display scanning direction. This asymmetric angular configuration prevents the periodic interference that causes moire patterns, while still maintaining the electrode's ability to detect touch input. The asymmetric design breaks the symmetry between electrode patterns and display pixel arrays, eliminating the harmful interference effect.
Solution Approach 2:
The patent changes the angular parameter of touch electrode edges from conventional orientations (such as 0, 45, or 90 degrees) to a specific range of 20-25 degrees. This parameter modification optimizes the electrode pattern to avoid resonance with the display's pixel structure, thereby preventing moire patterns while preserving touch detection functionality.
2Manufacturing precision
If high PPI display panels are developed, then display resolution is improved, but interference from touch electrode patterns increases
Solution Approach 1:
As display PPI increases, the pixel structure becomes more refined and susceptible to interference. The patent applies asymmetry by setting electrode edge angles at 20-25 degrees, which creates an asymmetric relationship between the electrode pattern and the high-density pixel array. This asymmetric configuration prevents periodic interference even at high PPI levels, allowing both high display resolution and clean visual output.
Solution Approach 2:
The patent modifies the angular parameter of electrode edges to fall within 20-25 degrees, which is specifically optimized for high PPI displays. This parameter change ensures that the electrode pattern does not align with or interfere with the finer pixel structures in high-resolution displays, enabling both high manufacturing precision and minimal interference.
3Ease of manufacture
If touch electrode edges are aligned with sub-pixel unit arrays, then manufacturing is simplified, but moire patterns are generated
Solution Approach 1:
The patent applies asymmetry by deliberately misaligning electrode edges with the sub-pixel unit arrays at specific asymmetric angles (20-25 degrees). This asymmetric angular relationship prevents the electrodes from aligning with the pixel grid, thereby eliminating moire patterns while still allowing for simplified manufacturing through standardized angular specifications.
Solution Approach 2:
The patent changes the alignment parameter from conventional aligned orientations (0 degrees with pixel rows/columns) to a specific angular range of 20-25 degrees. This parameter modification prevents alignment between electrode edges and sub-pixel units, eliminating moire patterns while maintaining ease of manufacture through well-defined angular parameters that can be implemented using standard fabrication processes.
Data Source
AI summary
A touch electrode structure and a touch display panel are provided. The touch electrode structure includes a plurality of first touch electrodes and a plurality of second touch electrodes. The plurality of first touch electrodes are extending along a first direction, each of the first touch electrodes has a shape of a polygon and includes a plurality of first edges, a range of an angle between an extension direction of each of the first edges and the first direction is 20 to 25 degrees; the plurality of second touch electrodes are extending along a second direction, each of the second touch electrodes has a shape of a polygon and includes a plurality of second edges, a range of an angle of an extension direction of each of the second edges and the second direction is 20 to 25 degrees.