OLED Touch Metal Mesh Electrodes in Emission Gaps
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Solution Overview
Problem
In OLED display touch panels, metal mesh structures used in On-cell technology can block the display screen and affect visibility at certain angles, compromising display quality.
Innovation Solution
A touch structure with a metal mesh electrode layer, insulation layer, and bridge layer is implemented, where driving and sensing electrodes are arranged within the gaps of the OLED emission layer, forming specific angles and connections to avoid blocking the display while enabling touch functionality without obstructing the screen.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If metal mesh structure is used in On-cell technology, then touch functionality is enabled, but display screen is blocked and visibility is affected at certain angles
Solution Approach 1:
The patent transitions from traditional planar touch electrode arrangements to a three-dimensional configuration where electrodes are positioned within the gaps of the OLED emission layer. This spatial repositioning allows touch functionality to be achieved without blocking the display surface, as electrodes are embedded in the vertical dimension rather than occupying the horizontal display plane.
Solution Approach 2:
The touch electrode structure is nested within the OLED emission layer gaps. The driving and sensing electrodes are positioned inside the vertical structure of the OLED, specifically within the gaps between emission layers, allowing the touch function to be integrated without adding external blocking elements to the display surface.
2Length of stationary object
If In-cell technology is adopted to reduce thickness, then display device becomes thinner, but touch performance and noise processing become more challenging
Solution Approach 1:
The patent applies different electrode configurations in different regions: driving electrodes are positioned along a first direction while sensing electrodes are positioned along a second direction, with bridge wires connecting adjacent sensing electrodes. This localized differentiation optimizes both touch sensitivity and noise rejection specifically for the In-cell thin-form-factor application.
Solution Approach 2:
The touch structure employs a composite arrangement combining metal mesh electrodes with insulation layers and bridge wire connections. This composite structure integrates multiple functional elements (conductive pathways, insulating barriers, and connecting bridges) into a unified thin-film system that maintains touch performance while achieving reduced thickness.
Data Source
AI summary
The present disclosure relates to a touch structure for OLED structure. The touch structure includes an electrode layer, an insulation layer, and a bridge layer stacked in sequence. The electrode layer is of a metal mesh structure having a plurality of driving electrodes along a first direction and a plurality of sensing electrodes along a second direction. The driving electrodes and the sensing electrodes are disposed within gaps of an emission layer of the OLED. The first direction and the second direction forming a first angle. Two adjacent driving electrodes along the first direction are connected. The bridge layer are configured with bridge wires. The insulation layer is configured with openings. The bridge wires connect to two adjacent sensing electrodes along the second direction via the openings.