In-Cell Touch Electrode Layout Using Spacer-Overlapped Bridge Parts
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Solution Overview
Problem
In-cell type touch display panels face a challenge in balancing low resistance for touch electrodes with minimal light shielding to maintain brightness, as materials with low resistance rates can obstruct light emission areas.
Innovation Solution
The touch display panel design includes a first touch electrode with a bridge part that has a low resistance rate, electrically connected to sensing parts, and is positioned on a spacer or protrusion outside the light emitting area, reducing overall resistance while minimizing light shielding effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the bridge part is formed of a material having a low resistance rate, then the resistance of the touch electrode is reduced, but the light emitting area is blocked and brightness is affected
Solution Approach 1:
The bridge part is positioned in the thickness direction (z-axis) of the display panel, overlapping with the spacer, rather than being arranged in the planar direction. This vertical stacking allows the low-resistance bridge part to connect sensing parts without occupying the light emitting area in the x-y plane, thus resolving the contradiction between touch performance and brightness.
Solution Approach 2:
The bridge part is nested within or aligned with the spacer structure in the thickness direction. This nesting arrangement allows the bridge part to be integrated into the existing spacer region, utilizing the same vertical space without adding lateral complexity or blocking light in the display area.
2Illumination intensity
If the bridge part is positioned outside the light emitting area, then brightness is maintained, but the resistance reduction effect may be limited
Solution Approach 1:
By transitioning the bridge part arrangement from a planar configuration to a vertical stacking configuration overlapping with the spacer, the design achieves both low resistance (through direct vertical connection) and high brightness (by avoiding lateral occupation of light emitting area).
Data Source
AI summary
The electronic device of the disclosure includes a substrate, a spacer, a sensing electrode, a first electrode, a second electrode and a transistor. The spacer is disposed on the substrate. The sensing electrode disposed on the substrate, wherein a portion of the sensing electrode is overlapped with the spacer. The first electrode is disposed on the spacer. The second electrode is disposed on the substrate, wherein the spacer is disposed between the second electrode and the first electrode. The transistor is disposed on the substrate and electrically connected to the second electrode, and the spacer is overlapped with a portion of the transistor.