OLED Touch Sensor Layout With Composite Dielectric Overlap
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Solution Overview
Problem
The existing process of manufacturing touchscreen display devices is complex and costly due to the separate manufacturing and attachment of touchscreens to display panels, which involves additional steps and increases expenses.
Innovation Solution
An organic light-emitting display device with touch sensors where touch-sensing and touch-driving lines are integrated on an encapsulation stack, overlapping each other with both organic and inorganic dielectric films to prevent damage and spot generation, thus eliminating the need for an additional bonding process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the touchscreen is separately manufactured and attached to the display panel using adhesive, then the touch sensor can be independently produced and tested, but the manufacturing process becomes complicated and costs increase due to additional attaching steps
Solution Approach 1:
The patent combines the touch sensor and display panel into a single integrated structure where the touch sensor is formed directly on the display panel substrate. The touch sensing electrodes and display electrodes are patterned on the same substrate, eliminating the need for separate touchscreen manufacturing and adhesive bonding processes.
2Reliability
If the touchscreen is separately manufactured and attached to the display panel, then quality control can be performed independently, but the manufacturing costs increase due to additional attaching steps
Solution Approach 1:
The integration of touch sensor and display panel allows for unified manufacturing processes, reducing the number of production steps and associated costs. The touch sensor electrodes are formed using the same thin-film deposition and patterning processes as the display electrodes, eliminating separate touchscreen fabrication and assembly costs.
3Device complexity
If the touch-sensing line and touch-driving line overlap with only an organic dielectric film between them, then the manufacturing process is simplified, but spots are generated in the event of degeneration of the organic dielectric film
Solution Approach 1:
The patent employs a composite dielectric structure consisting of both organic and inorganic dielectric films between the touch-sensing line and touch-driving line. The inorganic dielectric film provides superior stability and resistance to degradation, preventing spot formation while maintaining electrical insulation properties.
4Ease of manufacture
If the organic touch dielectric film is used alone between the touch lines, then the manufacturing process is simplified, but the organic touch dielectric film is damaged
Solution Approach 1:
The patent creates a composite dielectric system where an inorganic dielectric film is deposited over the organic dielectric film. This protective inorganic layer prevents damage to the organic film during subsequent manufacturing processes while maintaining the benefits of the organic film's deposition simplicity.
Data Source
AI summary
Various embodiments provide a thin and lightweight organic light-emitting display device having a touch sensor. The organic light-emitting display device having a touch sensor includes a touch-sensing line and a touch-driving line disposed on an encapsulation stack so as to overlap each other. The touch-sensing line and the touch-driving line overlap each other in a location in which an organic touch dielectric film and an inorganic touch dielectric film are disposed therebetween, thereby preventing the generation of spots in the event of degeneration of the organic touch dielectric film and preventing damage to the organic touch dielectric film.