Display Panel Touch Electrode Recesses to Reduce Off-Axis Color Shift
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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 with a touch electrode recessed in a specific direction overlapping non-emission areas between emission areas, utilizing a first and second recess in the touch electrode and insulating layers, formed through chemical vapor deposition and photolithography methods, to enhance viewing angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If touch sensing elements are incorporated into the display device, then touch functionality is provided, but color shift at off-center angles occurs reducing image quality
Solution Approach 1:
The touch electrode is divided into multiple segments (first touch electrode, second touch electrode, third touch electrode) that are selectively positioned over different emission areas. This segmentation allows the touch functionality to be maintained while reducing the negative impact on viewing angles by not having a continuous electrode structure that causes color shift.
Solution Approach 2:
Different regions of the display have different electrode configurations. The first emission area has a touch electrode that may cause color shift, while the second and third emission areas have touch electrodes positioned to minimize color shift. This local differentiation allows touch functionality to be provided while maintaining image quality in critical viewing regions.
2Area of stationary object
If a continuous touch electrode is formed over the display panel, then touch sensing coverage is maximized, but color shift at off-center angles increases
Solution Approach 1:
The continuous touch electrode is segmented into multiple discrete electrode regions (first, second, and third touch electrodes) positioned over different emission areas. This segmentation reduces the overall area of the touch electrode structure that causes color shift while maintaining touch sensing functionality across the display.
Solution Approach 2:
Different electrode structures are applied to different emission areas based on their specific requirements. The first emission area receives a touch electrode configuration optimized for its function, while the second and third emission areas receive configurations optimized to minimize color shift, achieving local optimization of both touch coverage and image quality.
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 reducing color shift at off-center angles through the strategic design of the touch electrode and insulating layers, enhancing the display device's viewing angles.
Implementation Method 1
Some display devices suffer from color shift at off-center angles thereby reducing perceived image quality
Implementation Method 2
The touch electrode may be formed by chemical vapor deposition (CVD) on the first insulating layer
Implementation Method 3
The trench may be formed by removing a portion of the first insulating layer using a photolithography method
Data Source
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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.