Recessed Touch Electrodes in Non-Emission Areas for Color Stability
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Solution Overview
Problem
Display devices suffer from color shift at off-center angles, reducing perceived image quality due to the incorporation of touch sensing elements.
Innovation Solution
A display device design featuring a touch electrode with recessed areas and a specific arrangement of sub-pixels, including a first and second recess in the touch electrode overlapping non-emission areas between emission areas, and the use of insulating layers with trenches formed by photolithography, enhancing the visibility of touch sensing units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If touch sensing elements are incorporated into the display device, then touch sensing capability is provided, but color shift at off-center angles occurs reducing image quality
Solution Approach 1:
The touch electrode is extracted from the flat surface and formed with recesses that extend downward into the insulating layer. This extraction creates depth variation that allows light to pass through more effectively at off-center angles, reducing color shift while preserving touch sensing functionality.
Solution Approach 2:
The touch electrode transitions from a two-dimensional flat structure to a three-dimensional structure with recesses having depth in the vertical dimension. This dimensional change enables the electrode to maintain touch sensitivity while allowing improved light transmission at various viewing angles, thereby reducing color shift.
2Ease of manufacture
If a flat touch electrode is used, then manufacturing is simple, but touch sensing unit visibility is reduced
Solution Approach 1:
The touch electrode incorporates curved recesses with rounded bottom surfaces rather than sharp corners. This curvature design improves light scattering and reflection properties, enhancing the visibility of the touch sensing unit while maintaining compatibility with standard manufacturing processes.
3Measurement precision
If the touch electrode is formed closer to the emission areas, then touch sensitivity is improved, but color shift increases
Solution Approach 1:
The touch electrode features localized recesses positioned specifically in regions where they can enhance touch sensitivity without interfering with light emission. The recesses are strategically placed to create optimal touch detection zones while allowing light to pass through unaffected, thus improving touch sensitivity without increasing color shift.
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
Improves image quality by minimizing color shift at off-center angles while maintaining effective touch sensing capabilities.
Implementation Method 1
The trench may be formed by removing a portion of the first insulating layer using a photolithography method.
Implementation Method 2
The touch electrode may be formed by chemical vapor deposition (CVD) on the first insulating layer.
Data Source
AI summary
A display device includes a display panel including a plurality of sub-pixels including emission areas, and a touch electrode formed on the display panel and overlapping a non-emission area adjacent to the emission areas. The touch electrode includes a first recess that is recessed in a first direction facing the display panel and overlaps a portion of the non-emission area disposed between first and second emission areas adjacent to each other among the emission areas.