Touch Display Panel Multi-Channel Gating for Fan-Out Short Detection
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Solution Overview
Problem
Existing touch display panels cannot detect short circuits in touch fan-out lines during visual testing, leading to reduced reliability of touch detection.
Innovation Solution
A touch display panel design with a multi-channel gating circuit architecture and separate control circuits for adjacent touch electrode groups, allowing for different common signals to be applied to adjacent electrodes, creating a checkerboard pattern for short-circuit detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional touch display panel structure is used with standard touch detection methods, then the structure is simple and easy to manufacture, but short circuits in touch fan-out lines cannot be detected, reducing detection reliability
Solution Approach 1:
The touch electrode array is divided into multiple touch electrode groups, with adjacent groups connected to different common signal lines through separate control switches. This segmentation enables independent control of different electrode groups, allowing short circuit detection in touch fan-out lines by comparing patterns across groups while maintaining manageable circuit complexity
Solution Approach 2:
Separate control switches and common signal lines are introduced as intermediary elements between the touch electrodes and the signal source. These intermediaries enable the application of different common signals to adjacent electrode groups, creating detectable patterns that reveal short circuits without requiring complete redesign of the touch detection system
2Measurement precision
If different common signals are applied to adjacent touch electrodes through separate control circuits, then short circuits in touch fan-out lines can be detected, but the control circuit structure becomes more complex
Solution Approach 1:
The control circuit is segmented into separate control switches for adjacent touch electrode groups, with each switch independently controllable through separate switch control lines. This segmentation enables precise detection of short circuits by allowing different common signals to be applied to different groups, improving measurement precision while keeping each control module relatively simple
Solution Approach 2:
Different common signal lines are assigned to different touch electrode groups based on their spatial location and connection to specific fan-out lines. This local differentiation enables targeted short circuit detection for each fan-out line while maintaining a systematic and organized control circuit structure that is easier to manage than a fully centralized approach
Data Source
AI summary
A touch display panel includes multiple touch electrodes arranged in an array; M adjacent touch electrodes form a touch electrode group. The touch display panel further includes a first control circuit, a second control circuit, multiple gating control lines, multiple common signal lines, multiple switch control lines, and multiple touch fan-out lines. The first control circuit includes multiple multi-channel gating circuits. The second control circuit includes multiple control switches. Control terminals of the control switches are electrically connected to the switch control lines, input terminals of the control switches are electrically connected to the common signal lines, and output terminals of the control switches are electrically connected to the touch electrodes respectively. Control switches electrically connected to adjacent touch electrodes in different touch electrode groups are electrically connected to different common signal lines and different switch control lines respectively.