Counter Electrode Wiring for In-Cell Touch Short-Circuit Detection
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Solution Overview
Problem
Existing in-cell touch panel display devices face issues with accurate touch detection due to short-circuits between adjacent common electrodes, which affect both display and touch sensor functionality.
Innovation Solution
The display device incorporates a configuration where counter electrode wiring lines connected to adjacent counter electrodes are connected to different common voltage wiring lines, allowing for the detection of short-circuits and reducing parasitic capacitance variations, thereby enhancing touch position detection and minimizing luminance unevenness during image display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If common electrodes are used for both display and touch sensor functions, then device functionality is improved, but short-circuit detection capability deteriorates
Solution Approach 1:
The patent segments the common electrodes into multiple groups (first common electrodes and second common electrodes) with different wiring connections. Each group is connected to different sensor lines, allowing independent detection of short-circuits while maintaining dual functionality for display and touch sensing.
2Device complexity
If adjacent counter electrodes are connected to the same common voltage wiring line, then wiring complexity is reduced, but short-circuit detection capability is lost
Solution Approach 1:
Adjacent counter electrodes are segmented into different groups connected to different common voltage wiring lines. This segmentation enables short-circuit detection by comparing voltages across different wiring lines while keeping the overall wiring structure manageable.
Solution Approach 2:
The patent introduces switching elements as intermediaries between the common voltage wiring lines and counter electrodes. These switching elements enable selective connection and voltage application, facilitating short-circuit detection without requiring permanent complex wiring changes.
3Reliability
If counter electrodes are connected to different common voltage wiring lines, then short-circuit detection capability is improved, but parasitic capacitance variations increase
Solution Approach 1:
The patent applies the same common voltage to multiple common voltage wiring lines simultaneously, creating equipotential conditions. This approach enables short-circuit detection through voltage comparison while minimizing parasitic capacitance variations by ensuring uniform voltage distribution across all wiring lines.
Data Source
AI summary
The display device includes, on a substrate, a plurality of pixel electrodes, M (M is a natural number equal to or greater than three) counter electrodes disposed opposite the plurality of pixel electrodes, M counter electrode wiring lines connected with M counter electrodes, and N (N is a natural number and 2≤N<M) common voltage wiring lines connected to the M counter electrode wiring lines. Counter electrode wiring lines connected to counter electrodes adjacent to each other are connected to common voltage wiring lines that are different from each other.