Shift Register Turn-Off Restoring Module Parasitic Capacitance
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Solution Overview
Problem
Existing self-capacitive touch display devices suffer from poor touch performance due to parasitic capacitance between the touch electrode and the gate line, increasing the load on the touch electrode and affecting accuracy.
Innovation Solution
A shift register with a turn-off restoring module and touch control module is used to output a touch scan signal to the gate line during the touch scan phase, ensuring identical signals are applied to both the gate line and touch electrode, reducing parasitic capacitance and enhancing touch performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate touch electrode leads are used to provide touch sensing signals, then touch control function is achieved, but parasitic capacitance between gate line and touch electrode increases
Solution Approach 1:
The patent merges the touch electrode lead with the gate line by making them share a common conductive structure. The gate line serves dual purposes: driving the display panel and providing touch sensing signals. This integration eliminates separate touch electrode leads and reduces parasitic capacitance by aligning the signal paths of the gate line and touch electrode.
Solution Approach 2:
The gate line is designed to perform multiple functions simultaneously: it acts as both a display driving signal line and a touch sensing signal line. By making the gate line universal, the patent eliminates the need for separate dedicated touch electrode leads, thereby reducing parasitic capacitance while maintaining touch control functionality.
2Adaptability or versatility
If separate touch electrode leads are used to provide display driving voltages, then display function is achieved, but load on touch electrode increases
Solution Approach 1:
The patent combines the display driving signal path and touch electrode signal path into a single shared path through the gate line. This merging reduces the total number of separate connections and reduces the overall load on the touch electrode by eliminating redundant separate leads.
Solution Approach 2:
The gate line is designed as a universal conductor that carries both display driving voltages and touch sensing signals. This multi-functionality reduces the load on the touch electrode by consolidating multiple signal transmission functions into a single low-capacitance path.
3Adaptability or versatility
If common electrode layer is divided into multiple separate common electrodes, then time-division driving is enabled, but device complexity increases
Solution Approach 1:
The common electrode layer is divided into multiple separate common electrodes that can be independently controlled during time-division driving. This segmentation enables different regions to be activated at different times for touch sensing versus display driving,实现ing flexible time-division multiplexing while maintaining manageable structural complexity.
Data Source
AI summary
A shift register, a driving method, a gate driving circuit and a display device are provided. The shift register includes a scan control module, an output module, a pull-down module, a turn-off restoring module and a touch control module. The turn-off restoring module is electronically connected to the scan control module at a first node and electronically connected to the touch control module and the output module at a second node. The turn-off restoring module controls the first node to be electrically insulated from the second node during a touch scan phase, and restores a potential of the second node to a potential at a time instant before the touch scan phase when the touch scan phase is finished. The touch control module controls the output module to output a touch scan signal to an output terminal of the shift register during the touch scan phase.