Auxiliary Driver Circuit for Rapid Touch Detection on High-Resolution Displays
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Solution Overview
Problem
As display panels increase in precision and size, the time available for touch detection decreases, leading to a challenge in maintaining touch detection accuracy while performing touch detection operations quickly.
Innovation Solution
A display panel design incorporating plural drive electrodes, touch detecting electrodes, a main driver unit, and an auxiliary driver unit that exchanges electric charges between a capacitive element and the drive electrodes in synchronization with a pulse part of the basic drive signal, allowing for efficient touch detection without compromising accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the display panel increases in precision or size, then the display quality is improved, but the time available for touch detection decreases
Solution Approach 1:
The auxiliary driver unit performs charge exchange operations in advance during the pulse part of the drive signal, preparing the capacitive element before the main touch detection phase. This preliminary action ensures that the system is ready for rapid touch detection without compromising accuracy, even when the overall detection time window is reduced due to higher display precision requirements
2Measurement precision
If the number of horizontal lines increases, then the display resolution is improved, but the writing period ratio increases and touch detection time decreases
Solution Approach 1:
The auxiliary driver unit performs periodic charge exchange operations synchronized with the pulse part of the drive signal. This periodic action occurs at specific intervals during the display refresh cycle, allowing the system to maintain touch detection capability across multiple horizontal lines without requiring continuous detection time, thus supporting higher resolution displays
Solution Approach 2:
Charge exchange is performed in advance during the pulse part before the main touch detection phase, preparing the capacitive element for rapid response. This preliminary charging/discharging action ensures that when touch detection occurs, the system can quickly respond even with reduced time windows imposed by high-resolution displays with many horizontal lines
3Speed
If touch detection is performed quickly, then the response time is improved, but the touch detection accuracy may decrease
Solution Approach 1:
The auxiliary driver unit performs preliminary charge exchange during the pulse part of the drive signal, preparing the capacitive element in advance. This preliminary action ensures that when touch detection occurs rapidly, the system maintains sufficient signal strength and stability for accurate measurement, resolving the trade-off between speed and accuracy
Solution Approach 2:
The capacitive element acts as an intermediary between the drive electrode and the touch detecting electrode. By mediating the charge exchange process, it amplifies the touch signal while allowing rapid detection, thus maintaining accuracy even at high detection speeds
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables rapid touch detection while maintaining high accuracy, even with increased precision or size of the display panel, by shortening the transition time of the drive signal and reducing the possibility of waveform collapse.
Implementation Method 1
the one or more touch detecting electrodes form a capacitor along with the corresponding drive electrode
Implementation Method 2
exchanges electric charges between the capacitive element and the drive electrodes in synchronization with the pulse part
Data Source
AI summary
A display panel includes: display elements; a plurality of drive electrodes; one or more touch detecting electrodes that form a capacitor along with the corresponding drive electrode; a main driver unit that generates a basic drive signal including a pulse part supplied to the drive electrodes; and a first auxiliary driver unit that includes a capacitive element and that exchanges electric charges between the capacitive element and the drive electrodes in synchronization with the pulse part.