Shared Electrode Touch Panel Reduces Wiring Density
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Solution Overview
Problem
In touch display devices, the increasing screen-to-body ratio of intelligent mobile terminals reduces space for fingerprint identification modules, leading to dense wiring between touch and fingerprint identification film layers, which blocks light emission from the touch panel.
Innovation Solution
A touch panel design with a first electrode, second electrode, and third electrode, where the first and second electrodes form a touch film layer, and the second and third electrodes form a fingerprint identification film layer, sharing a common electrode to reduce wiring density and prevent light blocking, allowing for both touch and fingerprint identification functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the fingerprint identification module is arranged in the touch display area, then the screen-to-body ratio is improved, but the wiring density increases and light blocking occurs
Solution Approach 1:
The patent merges the touch film layer and fingerprint identification film layer into a single integrated structure. The first electrode and second electrode are crosswise arranged to form a touch film layer, while the second electrode and third electrode are crosswise arranged to form a fingerprint identification film layer. This merging reduces the number of separate wiring systems and decreases overall wiring density in the display area.
Solution Approach 2:
The second electrode serves dual purposes: it functions as part of the touch film layer (crossed with the first electrode) and as part of the fingerprint identification film layer (crossed with the third electrode). This multi-functionality reduces the total number of electrodes and wirings needed, thereby reducing wiring density and light blocking while maintaining both touch and fingerprint identification capabilities.
2Reliability
If separate wiring is used for touch film layer and fingerprint identification film layer, then functional independence is maintained, but wiring density increases and light blocking occurs
Solution Approach 1:
The patent combines the wiring structures of the touch and fingerprint identification systems into a shared electrode arrangement. The second electrode is commonly used in both the touch film layer and fingerprint identification film layer, reducing redundant wirings and minimizing light blocking while preserving functional independence through separate signal processing paths.
Solution Approach 2:
The second electrode is designed to serve multiple functions simultaneously: it participates in both touch detection (crossed with the first electrode) and fingerprint identification (crossed with the third electrode). This universal usage reduces the total wiring required and minimizes light blocking, while the system maintains functional independence by processing touch and fingerprint signals separately.
Data Source
AI summary
The disclosure is provided with a touch panel and driving control method thereof, and a touch display device. The touch panel includes: a first electrode, a second electrode, and a third electrode. The first electrode, the second electrode, and the third electrode are insulated from each other. The first electrode and the second electrode are crosswise arranged to form a touch film layer, and the second electrode and the third electrode are crosswise arranged to form a fingerprint identification film layer.