Organic Light-Emitting Display Touch Sensor Integration
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Solution Overview
Problem
The complexity and increased manufacturing costs of integrating a touchscreen into organic light-emitting display devices due to the need for a separate attachment process and additional components.
Innovation Solution
An organic light-emitting display device with a touch sensor featuring a single-layer structure where first and second bridges and touch electrodes are formed of the same material and disposed on a touch insulating film overlapping an encapsulation unit, simplifying the structure and eliminating the need for a separate adhesion process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a touchscreen is separately manufactured and attached to the front surface of the display panel, then the touch sensor can be independently optimized, but the overall process becomes complicated and manufacturing costs are increased
Solution Approach 1:
The patent merges the touch sensor and display panel into a single integrated structure. The touch sensor is formed directly on the front surface of the display panel using the same substrate and encapsulation layers, eliminating the need for separate manufacturing and attachment processes. This integration maintains touch sensor functionality while simplifying the overall manufacturing process and reducing complexity.
2Reliability
If a touchscreen is separately manufactured and attached to the front surface of the display panel, then the touch sensor can be independently optimized, but manufacturing costs are increased
Solution Approach 1:
The patent combines the touch sensor and display panel manufacturing into a single process flow. By forming the touch sensor electrodes and insulating layers during the same manufacturing steps as the display panel, the patent eliminates additional material costs and processing expenses associated with separate touchscreen production and attachment.
3Reliability
If touch electrodes and bridges are formed in different layers, then electrical connection is ensured, but the structure becomes complex and additional manufacturing steps are required
Solution Approach 1:
The patent resolves the electrical connection challenge by transitioning from a vertical stacking approach to a planar arrangement. Both touch electrodes and bridges are formed in the same layer but positioned at different horizontal locations, with insulating layers strategically placed to provide electrical isolation where needed while maintaining connectivity where required. This dimensional reorganization simplifies the structure while ensuring proper electrical connections.
Data Source
AI summary
An organic light-emitting display device can include a light-emitting element on a substrate; an encapsulation unit on the light-emitting element and including first and second inorganic encapsulation films, and an organic encapsulation film; a touch insulating film on the second inorganic encapsulation film; a touch sensor including first and second touch electrodes; a routing line; a touch pad; and a plurality of connection electrodes electrically connecting the routing line with the touch pad, in which the first touch electrodes are connected via first bridges, the second touch electrodes are connected via second bridges, and the first and second bridges and the first and second touch electrodes are formed of a same material as each other in a same plane.