Touch Electrode Patterning to Reduce Display Visibility
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Solution Overview
Problem
Touch electrodes on display panels are visually recognizable, leading to deteriorated display quality.
Innovation Solution
The touch electrodes are designed with irregular or regular patterns and dummy metals to reduce visibility, and are divided by cutting patterns, improving touch sensing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If touch electrodes are disposed on the display panel to provide touch sensing function, then touch sensing capability is improved, but display quality deteriorates due to visual recognition of touch electrodes
Solution Approach 1:
The touch electrode is divided into multiple segments with different widths arranged in a specific pattern. This segmentation allows the electrode to provide sufficient touch sensing area while creating visual gaps that reduce visibility and improve display quality.
Solution Approach 2:
Different portions of the touch electrode have different widths, creating varying levels of transparency and visual presence. The narrower segments reduce visual impact in critical display areas while wider segments maintain touch sensing effectiveness in less critical areas.
2Measurement precision
If touch electrode width is increased to improve touch sensing performance, then touch sensitivity is improved, but visual visibility of the electrode increases
Solution Approach 1:
The electrode is segmented into multiple sections of varying widths. The total sensing area is maintained through the cumulative effect of all segments, while individual narrow segments minimize visual visibility. This allows high touch sensitivity without the continuous wide structure that would cause visibility issues.
Solution Approach 2:
Instead of increasing width in one dimension, the electrode uses a multi-dimensional pattern arrangement where segments are distributed across the surface. This maintains effective sensing area through spatial distribution rather than uniform width expansion, reducing visual impact.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively minimizes the visual recognition of touch electrodes while enhancing touch sensing performance.
Implementation Method 1
the display devices can sense a touch of the user to the display panel by detecting a change of a capacitance occurred by the touch of the user
Data Source
AI summary
A touch display device can include a substrate, at least one transistor on the substrate, an organic light-emitting diode on the at least one transistor, an encapsulation layer on the organic light-emitting diode, a color filter and a black matrix on the encapsulation layer, a touch electrode disposed on the encapsulation layer, the touch electrode overlapped with the black matrix in a vertical direction; an overcoat layer on the color filter, and at least one touch routing line including a first touch routing line and a second touch routing line, the first touch routing line and the second touch routing line connected through a plurality of contact holes. Also, the touch electrode includes a plurality of openings, the first touch routing line is overlapped with the at least of a part of the openings in a vertical direction.