OLED Display Touch Panel Routing Line Connection Structure
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Solution Overview
Problem
In organic light emitting diode (OLED) display devices with built-in touch panels, connection defects between the touch panel and OLED array lead to degraded contact properties and increased bezel regions, reducing display area and reliability due to exposure of connection pads and sealants, which are prone to moisture and stress-induced separation.
Innovation Solution
The implementation of a connection line that electrically connects the OLED array and touch panel through an exposed routing line, eliminating the need for upper and lower connection pads and using a support substrate with a connection hole, bridge electrodes, and insulating films to enhance connection properties and reduce the bezel region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If connection pads and sealants are used to connect the touch panel and OLED array, then electrical connection is achieved, but the bezel region width increases and display area decreases
Solution Approach 1:
The invention extracts and eliminates the connection pads and sealants from the connection structure. Instead of using traditional connection pads that require sealant for connection, the patent uses routing lines that extend directly from the touch panel through connection holes to contact the OLED array, removing the need for separate connection pads and sealant layers, thus reducing the bezel region width.
Solution Approach 2:
The invention changes the connection approach from a planar connection method (using connection pads on the surface) to a three-dimensional routing method where routing lines pass through connection holes vertically from the touch panel to the OLED array, enabling more efficient space utilization and reduced bezel width.
2Device complexity
If connection pads and sealants are exposed to the outside, then connection structure is simplified, but contact properties degrade due to moisture and stress
Solution Approach 1:
The invention introduces an insulating film as an intermediary layer that covers the routing lines and connection holes. This insulating film acts as a protective barrier that prevents moisture and external stress from directly contacting the electrical connection elements, thereby maintaining contact properties while keeping the connection structure relatively simple.
Solution Approach 2:
The invention uses thin film structures (routing lines and insulating films) to create a protected connection path. The insulating film serves as a protective shell that shields the electrical connections from environmental factors, ensuring reliable contact properties without requiring complex sealing structures.
3Reliability
If upper and lower connection pads are used for connection, then electrical connection is established, but manufacturing precision requirements increase due to alignment needs
Solution Approach 1:
The invention removes the lower connection pad from the OLED array structure, eliminating the need for precise alignment between upper and lower connection pads. The routing line on the touch panel directly contacts the OLED array through the connection hole, reducing the number of alignment-critical interfaces from two (upper and lower pads) to one (routing line to OLED array contact point).
Data Source
AI summary
Disclosed is an organic light emitting diode (OLED) display device which includes an OLED array formed on a lower substrate; a touch panel attached to the lower substrate and including first and second sensor electrodes for sensing a touch and a routing line electrically connected to at least one of the first and second sensor electrodes and exposed to an upper surface of the touch panel; and a connection line electrically connecting the OLED array and the touch panel through an exposed portion of the routing line.