Touch Display Upper Electrode Integration
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Solution Overview
Problem
The existing touch display apparatuses face complexity in forming touch structures, which complicates the process of sensing user or tool touches due to the intricate arrangement of touch electrodes and light-emitting devices.
Innovation Solution
A touch display apparatus design featuring a device substrate with a pixel electrode, bank insulating layer, light-emitting layer, and upper electrode with separate electrode regions, where the touch wire overlaps with the second electrode region, simplifying the formation process by using link wires and encapsulating elements to enable touch sensing without additional patterning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If touch electrodes are disposed side by side on encapsulating element covering light-emitting devices, then touch sensing capability is achieved, but the process of forming touch structure becomes complicated
Solution Approach 1:
The patent combines the upper electrode of the light-emitting device with the touch electrode into a single integrated structure. The upper electrode serves dual functions: as the cathode for the organic light-emitting diode and as the touch sensing electrode. This merging eliminates the need for separate touch electrode formation processes and reduces the number of manufacturing steps while maintaining both display and touch sensing functionalities.
Solution Approach 2:
The upper electrode is designed to perform multiple functions simultaneously: it acts as the cathode for light emission in the OLED structure and as the sensing electrode for touch detection. This multi-functional design allows the same component to serve both display and interaction purposes, simplifying the overall device architecture and reducing process complexity.
2Measurement precision
If touch structure is independently controlled with light-emitting devices, then touch sensing accuracy is improved, but manufacturing process becomes more complex
Solution Approach 1:
The patent integrates the touch sensing function directly into the light-emitting device structure by using the upper electrode as the touch electrode. This combination maintains independent control capability for touch sensing while eliminating the need for separate touch sensor manufacturing processes, thereby improving ease of manufacture without sacrificing touch sensing accuracy.
Data Source
AI summary
A touch display apparatus senses a touch of a user, a tool or both. In the touch display apparatus, an upper electrode of a light-emitting device includes a first electrode portion overlapping an emission area, and a second electrode region spaced away from the first electrode region. A touch wire is disposed on an encapsulating element covering the light-emitting device. The touch wire includes a portion overlapping the second electrode region. Thus, in the touch display apparatus, a process of forming components for sensing the touch may be simplified.