Reset Circuit for Touch Display Gate Scanning Leakage
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Solution Overview
Problem
In conventional in-cell touch display technologies, the long touch detection process leads to electrical leakage at the node PU, preventing normal output of gate scanning signals due to the prolonged high level required for touch detection.
Innovation Solution
A reset circuit with a reset unit and control unit is introduced, which includes multiple input terminals and transistors to manage electrical levels, ensuring the node PU is maintained at the required level for normal scanning signal output by coupling input terminals during different stages of the scanning process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the touch detection process is performed between scanning of every two adjacent gate lines, then the touch detection function is achieved, but electrical leakage occurs at the node PU due to the prolonged high level maintenance, causing gate scanning signals to be unable to be normally output
Solution Approach 1:
The patent divides the operation into distinct stages: a first stage (touch detection) and a second stage (gate scanning). During the first stage, the node PU is maintained at a high level for touch detection. During the second stage, a reset circuit is activated to reset the node PU, enabling normal gate scanning signal output. This temporal segmentation allows both touch detection and gate scanning to function properly without interference.
Solution Approach 2:
The reset circuit is configured to reset the node PU in advance before the gate scanning process begins. By performing the reset action preliminarily, the circuit ensures that the node PU is in the correct state for gate scanning, preventing electrical leakage issues from affecting the scanning signal output.
2Duration of action of moving object
If a high level is maintained at the node PU during the touch detection process, then the touch detection can be completed, but electrical leakage occurs preventing normal output of gate scanning signals afterward
Solution Approach 1:
The patent extracts the reset function into a separate reset circuit that operates independently from the main touch detection and gate scanning circuits. This reset circuit is specifically designed to address the electrical leakage issue by resetting the node PU after touch detection, thereby separating the harmful effect (electrical leakage) from the useful function (touch detection).
Data Source
AI summary
A reset circuit for compensating a level reduction at a first node during a first stage without affecting levels during a second stage includes a reset portion, a reset control portion, and at least three input terminals. The reset portion is coupled to the first and second input terminals, and a second node, and is configured to be turned on if the second node is at a first level, to electrically couple the second and first input terminals. The reset control portion is coupled to the first, second, and third input terminals, and the second node, and is configured to electrically couple the second input terminal with the second node if the first input terminal is at the first level, and to electrically couple the second node with the third input terminal if the second input terminal is at a second level.