Shift Register Output Switching for Touch-Safe GOA Scanning
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Solution Overview
Problem
Traditional gate driving circuits in liquid crystal displays (LCDs) with integrated touch functionality face interference between touch signals and panel signals, affecting touch functionality and leading to noise and yield issues.
Innovation Solution
A new circuit design for a shift register unit that allows for GOA signal storage and continuous scanning by line during touch signal transmission, preventing interference between touch and panel signals, and enabling a switch between touch and traditional GOA functions while maintaining a high potential for noise reduction and yield improvement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional GOA design is used for LCD display, then gate driving function is achieved, but touch signal and panel signal interfere with each other affecting touch functionality
Solution Approach 1:
The patent implements dynamic control of the output sub-circuit through control signal GHG, which can switch between different operational states (outputting clock signal or high impedance) based on whether touch signal transmission is occurring. This dynamic switching prevents signal interference while maintaining both touch and display functions
Solution Approach 2:
The control signal GHG acts as an intermediary that coordinates between touch signal transmission and panel scanning operations. By using GHG to control the output sub-circuit's operational state, the patent mediates the interaction between touch and display signals, preventing interference while enabling both functions to operate reliably
2Reliability
If GOA signal continuously scans by line, then gate driving is maintained, but touch signal transmission is interfered with
Solution Approach 1:
The patent implements periodic alternation between two operational modes: during touch signal transmission periods, the output sub-circuit is controlled to be in high impedance state (storing GOA signal by line); during normal display periods, continuous line scanning is maintained. This periodic switching ensures both touch signal integrity and gate driving functionality
Solution Approach 2:
Before touch signal transmission begins, the system switches the output sub-circuit to high impedance state in advance, preparing the circuit to store GOA signals without interference. This preliminary action prevents potential signal conflicts before they occur, ensuring clean touch signal transmission
3Adaptability or versatility
If touch in cell function is integrated, then usability is improved, but signal interference and yield issues occur
Solution Approach 1:
The shift register unit is designed with multi-functionality, capable of operating in different modes (continuous scanning for display, signal storage for touch) controlled by GHG. This universal design allows the same circuit to reliably support both traditional GOA display driving and touch signal transmission without interference, improving overall system reliability
Data Source
AI summary
A shift register unit, drive method thereof, gate drive device and display device. The shift register unit includes: an input subcircuit; a reset subcircuit; an output subcircuit configured to provide a clock signal at a clock signal end to a current stage shift register unit output end in response to a voltage signal at the pull-up node and a control signal having a first voltage level, and to disable an output at the current stage output end in response to the control signal having a second voltage level; a pull down control subcircuit configured to provide a second voltage signal having a low voltage level to a pull-down node in response to the voltage signal at the pull-up node, and to provide the voltage signal having a high voltage level to the pull-down node in response to the voltage signal having a high voltage level; and a pull down subcircuit.