Shift Register Denoising Module for In-Cell Touch Display Interference
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Solution Overview
Problem
In in-cell touch control display devices, the touch control function is affected by the driving signal output from the gate driver, leading to interference issues.
Innovation Solution
A shift register with a pre-charge module, pull-up control module, denoising module, and reset module is used, where the denoising module denoises the output terminal in the touch control phase to prevent interference, and a compensation module charges the pull-up node to maintain voltage levels, ensuring stable signal output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the gate driver outputs driving signals to control gate lines, then the display device achieves high resolution and narrow frame, but the driving signals interfere with touch control functions
Solution Approach 1:
The patent segments the gate driver into multiple independent drive units, each capable of driving individual gate lines. This segmentation allows the system to isolate and control signal paths, preventing interference between display driving signals and touch control signals while maintaining high resolution display performance
Solution Approach 2:
The patent introduces an intermediary circuit structure between the gate driver and the gate lines, which acts as a buffer and isolator. This intermediary component filters and separates the driving signals from touch control signals, eliminating harmful interference while preserving the display quality
2Reliability
If the shift register outputs driving signals, then the gate driving circuit functions properly, but the output terminal becomes noisy during touch control phase
Solution Approach 1:
The patent implements periodic action by switching the shift register between different operational modes (display mode and touch control mode). During touch control phase, the shift register stops outputting driving signals and enters a quiet mode, periodically alternating between active driving and inactive states to prevent noise generation during touch sensing
Solution Approach 2:
The patent extracts and removes the signal generation function from the shift register during touch control phase. By taking out the driving signal output capability when not needed, the system eliminates the source of noise while preserving the gate driving function during display phases
3Device complexity
If the pull-up node is not properly charged, then the circuit structure remains simple, but the output signal voltage becomes unstable or insufficient
Solution Approach 1:
The patent applies preliminary action by adding a dedicated pull-up charging circuit that pre-charges the pull-up node before the shift register operates. This preliminary charging ensures the pull-up node reaches the required voltage level in advance, stabilizing the output signal voltage while maintaining relatively simple circuit structure through efficient use of existing power supply nodes
Data Source
AI summary
A shift register and a driving method thereof, a gate driving circuit and a display device are provided. The shift register includes: a pre-charge module, connected to a pull-up node and configured to charge the pull-up node in a pre-charge phase; a pull-up control module, connected to the pull-up node and an output terminal and configured to pull up a potential of the pull-up node in an output phase and output a driving signal through an output terminal; a denoising module, connected to the pull-up control module and the output terminal and configured to denoise the output terminal in a touch control phase; a reset module, connected to the pre-charge module, the pull-up node, the denoising module and the output terminal and configured to reset the pull-up node and the output terminal in a reset phase and denoise the pull-up node and the output terminal in a denoising phase.