Touch Drive Unit Noise Filtering via Segmented Shift Register
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Solution Overview
Problem
Mutual capacitive touch panels face noise interference in their touch drive signals, which degrades the transmission quality and affects the accuracy of touch position detection.
Innovation Solution
A touch drive unit comprising a shift register sub-unit and a gate sub-unit with specific circuits and transistors that manage and filter touch drive signals, including pull-up and pull-down control circuits, capacitors, and transistors to reduce noise and improve signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional touch drive circuits are used, then the device complexity is low, but noise interference in touch drive signals degrades transmission quality and affects touch position detection accuracy
Solution Approach 1:
The touch drive circuit is divided into multiple independent functional modules: shift register unit for signal generation, pull-up control circuit for voltage regulation, pull-down control circuit for noise filtering, and selection circuit for signal routing. Each module performs a specific function, allowing the system to reduce noise while maintaining manageable complexity through modular design.
Solution Approach 2:
The patent introduces intermediate control circuits (pull-up control circuit and pull-down control circuit) that act as mediators between the shift register and the touch drive electrode. These intermediary circuits filter and condition the drive signals before they reach the electrode, effectively reducing noise interference while preserving signal integrity for accurate touch detection.
2Reliability
If noise reduction circuits are added to improve signal transmission quality, then the transmission quality improves, but the device complexity increases
Solution Approach 1:
The patent combines multiple control functions into integrated circuit blocks. The pull-up control circuit and pull-down control circuit are merged with the shift register unit to form a cohesive touch drive circuit. This integration allows noise reduction functionality to be added without proportionally increasing overall device complexity, as the control circuits share common structural elements and control signals.
Solution Approach 2:
The patent employs dynamic parameter adjustment through controlled voltage levels and timing sequences. The pull-up control circuit adjusts voltage parameters to optimize signal levels, while the pull-down control circuit dynamically switches between different impedance states to filter noise. These parameter changes improve signal transmission quality without requiring additional hardware components.
Data Source
AI summary
A touch drive unit and a driving method thereof, a touch drive circuit and a touch device are disclosed. The touch drive unit includes a shift register sub-unit, a gate sub-unit. The shift register sub-unit includes a shift signal output terminal and is configured to output a shift signal to the gate sub-unit by the shift signal output terminal; the gate sub-unit includes a first input circuit, a first pull-up circuit, a first pull-down control circuit, and a first pull-down circuit; the first pull-up circuit is electrically connected to a touch drive signal terminal, a first pull-up node and a touch signal output terminal, and is configured to output a touch drive signal that is input from the touch drive signal terminal to the touch signal output terminal under a control of an electrical potential of the first pull-up node.