Touch Electrode Mesh Openings for Display Image Quality
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Solution Overview
Problem
Existing display devices with touch sensors face challenges in efficiently integrating touch functionality with light-emitting sub-pixels, particularly in maintaining image quality and responsiveness while minimizing visual detection of touch electrodes and reducing parasitic capacitance.
Innovation Solution
A display device structure featuring a first layer with light-emitting sub-pixels and a second layer containing intersecting touch electrodes, where the touch electrodes are formed as mesh wirings with openings, overlapping with partition walls and interlayer insulating films to reduce visual detection and enhance capacitance sensing, and a sealing film to minimize parasitic capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If touch electrodes are integrated over the display region to enable touch input, then touch sensing functionality is achieved, but the touch electrodes become visually detectable and reduce image quality
Solution Approach 1:
The touch electrodes are segmented into mesh-like patterns with multiple openings rather than continuous structures. This segmentation allows light to pass through the openings, reducing the visual detectability of the electrodes while maintaining touch sensing functionality across the display surface.
Solution Approach 2:
The touch electrodes are strategically positioned to overlap with partition walls rather than directly over sub-pixels. This local positioning places the electrodes in regions where they are less visually prominent, thereby maintaining image quality in the critical sub-pixel areas while preserving touch sensitivity.
2Device complexity
If touch electrodes are positioned to overlap with sub-pixels for compact integration, then device complexity is reduced, but parasitic capacitance increases and affects touch sensing accuracy
Solution Approach 1:
The touch electrodes are positioned to overlap with partition walls rather than sub-pixels, creating locally optimized zones. This positioning reduces parasitic capacitance in the sub-pixel regions while maintaining compact overall integration, thereby improving touch sensing accuracy without significantly increasing device complexity.
3Speed
If touch electrodes are made continuous to improve electrical conductivity, then sensing responsiveness is enhanced, but visual detectability increases and image quality deteriorates
Solution Approach 1:
The continuous touch electrode structure is segmented into mesh patterns with multiple openings. This segmentation reduces visual detectability by allowing light transmission through the openings while maintaining sufficient electrical conductivity through the interconnected electrode segments, thus balancing image quality and sensing responsiveness.
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 improves the responsiveness and accuracy of touch sensing while maintaining high image quality by reducing the visibility of touch electrodes and minimizing parasitic capacitance, thus enhancing the overall user experience and display performance.
Implementation Method 1
a plurality of first sub-pixels configured to emit first light; a plurality of second sub-pixels configured to emit second light; a plurality of third sub-pixels configured to emit third light
Implementation Method 2
a first touch electrode overlapping with the partition wall and arranged along the partition wall; and a second touch electrode overlapping with the partition wall, arranged along the partition wall, and intersecting the first touch electrode
Data Source
AI summary
Disclosed is a display device having a first layer and a second layer over the second layer. The first layer possesses a display region including: a plurality of first sub-pixels; a plurality of second sub-pixels; a plurality of third sub-pixels; a partition wall sandwiched by two adjacent sub-pixels; and a sealing film thereover. The second layer includes: a first touch electrode overlapping with the partition wall and arranged along the partition wall; and a second touch electrode overlapping with the partition wall, arranged along the partition wall, and intersecting the first touch electrode. The first touch electrode and the second touch electrode exist in the same layer. The first touch electrode and the second touch electrode each have a plurality of openings. Among the number of the first sub-pixels, the number of the second sub-pixels, and the number of the third sub-pixels, one is different from the other two.