Touch Display Gate Driver Frequency Control
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Solution Overview
Problem
Current touch display technologies face challenges in reducing noise interference and enhancing touch efficiency, particularly in On-Cell and Out-Cell structures, where signal transmission is affected by display panel noise, and In-Cell structures face insufficient pixel charge rates due to separate operation of touch and display driver circuits.
Innovation Solution
A touch display method and device that includes a gate driver circuit, touch sensor module, and display panel, where the gate driver circuit outputs first gate signals at a higher frequency when no touch input is detected and second gate signals at a lower frequency when a touch input is detected, reducing noise and signal variance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the gate driver circuit operates at high frequency to maintain display performance, then the display refresh rate is improved, but noise interference increases and affects touch signal detection
Solution Approach 1:
The gate driver circuit dynamically adjusts its operating frequency based on touch detection state. During touch detection periods, the frequency is reduced to minimize noise interference with touch signals. During non-touch periods, the frequency returns to normal to maintain display performance. This dynamic frequency adjustment resolves the contradiction between display refresh rate and noise interference.
Solution Approach 2:
The system implements periodic touch detection intervals where the gate driver circuit operates at reduced frequency only during these specific periods. Between detection periods, normal display operation continues at full frequency. This periodic modulation allows the system to achieve both high display performance and effective touch detection by confining low-frequency operation to necessary time windows.
2Object-affected harmful factors
If the touch circuit and display driver circuit are operated separately to reduce noise, then noise interference is reduced, but pixel charge rate becomes insufficient
Solution Approach 1:
The touch detection function and display driving function are merged into a single gate driver circuit. This unified circuit can coordinate touch detection and display updating operations, allowing pixel charging to occur during periods when touch detection is not active. By merging rather than separating the functions, the system maintains sufficient pixel charge rates while still achieving noise reduction through temporal separation of operations.
Solution Approach 2:
The gate driver circuit performs preliminary charging of pixel electrodes before touch detection periods begin. This ensures that pixels are fully charged and stabilized before the low-frequency touch detection phase starts, preventing charge rate insufficiency. The preliminary action of charging occurs at normal frequency, then frequency is reduced for touch detection, resolving the contradiction between separate operation and adequate charging.
Data Source
AI summary
A touch display and method for controlling the same are provided. The touch display includes a gate driver circuit, a touch sensor and a display panel. The method includes: when the touch sensor detects no touch input signal, the gate driver circuit outputs a plurality of first gate signals to the display panel at a first frequency; and when the touch sensor detects a touch input signal, the gate driver circuit outputs a plurality of second gate signals to the display panel at a second frequency. The second frequency is smaller than the first frequency.