Touch Display Device with Single-Plane Electrode Integration
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Solution Overview
Problem
Conventional capacitive touch display devices have increased thickness due to separate layers for touch driving and sensing electrodes, which limits their design and functionality.
Innovation Solution
The touch display device integrates a touch sensing layer with a first and second touch electrode layer, where the polarizer serves as a growth substrate for the first electrode layer and the covering layer for the second, allowing for a reduced thickness configuration while maintaining effective touch position determination through mutual-capacitive sensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate layers for touch driving and sensing electrodes are used, then effective touch sensing is achieved, but the touch panel thickness increases
Solution Approach 1:
The patent merges the touch driving electrode and touch sensing electrode into a single plane structure, where both electrodes are formed on the same substrate layer rather than using separate stacked layers. This integration maintains the mutual capacitive sensing functionality while significantly reducing the overall touch panel thickness by eliminating the need for multiple electrode layers and their associated insulating layers.
Solution Approach 2:
The single-plane electrode structure serves dual functions: it acts as both the touch driving electrode and the touch sensing electrode simultaneously. The electrode pattern is designed to perform both driving and sensing operations within the same physical layer, thereby achieving multi-functionality and reducing structural complexity.
2Measurement precision
If multiple electrode layers are stacked, then touch detection accuracy is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple electrode functions into a single-plane structure, reducing the number of separate layers and components. This merging approach maintains touch detection accuracy through proper electrode patterning while significantly simplifying the overall device structure and reducing manufacturing complexity.
3Length of stationary object
If reduced thickness configuration is implemented, then device design flexibility is improved, but manufacturing precision requirements increase
Solution Approach 1:
By merging the driving and sensing electrodes into a single-plane structure, the patent reduces the number of deposition and patterning steps required. This integration lowers the cumulative precision requirements compared to stacking multiple separate electrode layers, as fewer manufacturing steps are needed to achieve the same functional result.
Solution Approach 2:
The patent employs low-temperature deposition processes to form the electrode pattern on the single-plane structure. This parameter change in the manufacturing process allows for precise electrode formation at lower temperatures, reducing thermal stress and distortion while maintaining the required precision for the thin-profile design.
Data Source
AI summary
A touch display device includes a display panel, a covering layer on the display panel and configured for covering the display panel, a touch sensing layer on a side of covering layer away from the display panel, and a polarizer on a side of covering layer away from the display panel. The touch sensing layer includes a first touch electrode layer and a second touch electrode layer electrically insulated from the first touch electrode layer. The first touch electrode layer is on and in direct contact with the polarizer; the second touch electrode layer is on and in direct contact with the covering layer.