Array Substrate Touch Signal Terminal Sharing for Narrow Bezel
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Solution Overview
Problem
Existing display panels face challenges in achieving a narrow bezel design due to the large number of traces in the frame area, which increases the width of the frame and hinders touch detection accuracy.
Innovation Solution
The array substrate incorporates M second switch control lines, second switch device groups, and touch signal terminal groups in the non-display area, allowing touch signal terminals to share among multiple electrode columns, reducing the number of touch signal terminals and traces, and using pulse signals with the same waveform as touch detection signals to enhance touch detection performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If each electrode column is connected to a separate touch signal terminal, then touch detection accuracy is maintained, but the number of traces in the frame area increases, causing increased frame width
Solution Approach 1:
Multiple electrode columns (M columns) share a common touch signal terminal through a switch device group. The switch devices selectively connect the common terminal to different electrode columns based on control signals, reducing the total number of touch signal terminals from M to 1 while maintaining individual access to each electrode column
Solution Approach 2:
The patent introduces switch devices that dynamically connect or disconnect electrode columns from the common touch signal terminal based on control signals. This dynamic switching allows the same physical terminal to serve multiple electrode columns at different time periods, resolving the contradiction between reducing terminal数量 and maintaining detection accuracy
2Length of stationary object
If the number of touch signal terminals is reduced, then frame width is narrowed, but the complexity of signal routing and switch control increases
Solution Approach 1:
The patent divides the electrode columns into groups and uses switch device groups with specific connection patterns. Each switch device group handles a subset of electrode columns, and the switching is controlled in a systematic manner, making the complex routing manageable through modular organization
Solution Approach 2:
The common touch signal terminal serves multiple electrode columns through the switch devices, making it a universal interface. The same terminal and switch infrastructure can handle signals for M different electrode columns, reducing overall system complexity despite the dynamic switching requirements
3Measurement precision
If pulse signals are applied to non-touch electrode columns during touch detection, then touch detection accuracy is improved by reducing interference, but signal timing and waveform synchronization complexity increases
Solution Approach 1:
The patent applies pulse signals to non-touch electrode columns before or during the touch detection process to preemptively counteract potential interference. By activating these columns with the same waveform as the touch detection signal, the system prevents capacitive coupling effects from degrading the detection accuracy
Solution Approach 2:
The patent uses periodic pulse signals with the same waveform characteristics as the touch detection signals. This periodic activation of non-touch columns creates a synchronized pattern that maintains signal integrity while allowing for systematic timing control through the switching mechanism
Data Source
AI summary
Disclosed are an array substrate and a driving method, a display panel and a touch display device. The array substrate includes: electrode column groups each including M adjacent electrode columns; touch signal lines each including a first signal line and a second signal line electrically connected to each other; M common voltage lines, M first switch control lines and first switch device groups; and M second switch control lines, second switch device groups and touch signal terminal groups. Each second switch device group includes M sub-switch device groups, each of which includes N second switch devices, and each touch signal terminal group includes N touch signal terminals. N touch signal terminals in the same touch signal terminal group are respectively electrically connected to the second terminals of N second switch devices in any sub-switch device group in the same second switch device group in a one-to-one manner.