Flexible AMOLED Touch Panel Metal Grid Integration
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Solution Overview
Problem
Current touch technologies for AMOLED display panels, such as external touch film bonding and glass On-Cell solutions, result in increased thickness, which hinders the development of thin, flexible, and narrow frame designs.
Innovation Solution
A touch panel with intersecting first and second touch electrode strings, an insulating layer, and a metal bridge with through holes, allowing for flexible touch control by forming a metal grid touch sensing line on the encapsulation layer of the AMOLED display panel, reducing the need for transparent optical adhesives and minimizing thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If external touch film bonding solution is used, then touch control function is achieved, but product thickness increases
Solution Approach 1:
The patent merges the touch control function with the display panel structure by fabricating touch sensing lines and control lines directly on the packaged glass substrate. This integration eliminates the need for separate external touch film layers, achieving touch control while reducing overall product thickness.
Solution Approach 2:
The packaged glass substrate serves multiple functions: it provides structural support, protects the OLED layer, and acts as the substrate for fabricating touch sensing circuits. This multi-functionality reduces the need for additional separate components and layers.
2Reliability
If glass packaged On-Cell touch technology is used, then touch control function is achieved, but product thickness increases
Solution Approach 1:
The patent combines the touch sensing circuit fabrication with the existing packaged glass substrate process. By using the packaged glass as the base for touch electrode patterns, it eliminates the need for separate On-Cell touch panel layers, achieving touch functionality with reduced thickness.
3Stability of the object's composition
If multiple bonding layers are used, then structural integrity is maintained, but manufacturing precision requirements increase
Solution Approach 1:
The patent extracts and eliminates unnecessary intermediate bonding layers by directly fabricating touch sensing lines on the packaged glass substrate. This reduction in layer count decreases the cumulative bonding tolerance requirements while maintaining structural integrity through the integrated design.
Data Source
AI summary
Disclosed are a touch panel and a corresponding organic light emitting diode display panel. A metal grid touch line is fabricated on an encapsulation layer of a flexible organic light emitting diode display panel, and is not positioned in a light emitting area of a pixel point, and traced in a middle of adjacent pixel points. At least one electrode of a driving electrode and a sensing electrode is conducted with a metal grid bridge (bridge metal) thereunder, to realize a flexible touch panel and to reduce a thickness of a film by reducing use of transparent optical adhesive.