Touch Power Signal Circuit for Display Voltage Stability
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Solution Overview
Problem
Existing touch display devices face issues with unstable driving current during touch driving processes, leading to poor touch sensitivity and image quality due to parasitic capacitance and level differences between driving voltage and base voltage lines.
Innovation Solution
A touch display device and touch power signal generation circuit that stably supply driving current by simultaneously applying pulse modulation signals with the same phase and amplitude to the driving voltage line and base voltage line during touch driving periods, reducing parasitic capacitance effects and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pulse modulation signal is applied to the touch electrode during load free driving, then parasitic capacitance effects are reduced, but driving current becomes unstable due to level difference from driving voltage line
Solution Approach 1:
A touch power signal generation circuit is introduced as an intermediary component between the touch driving signal and the power supply lines. This circuit generates touch power signals that are level-matched to both the driving voltage line and base voltage line, acting as a mediator that bridges the level difference and enables stable current flow during touch driving without compromising touch sensitivity
Solution Approach 2:
The invention changes the voltage level parameter of the touch power signal dynamically. By generating touch power signals with different voltage levels corresponding to the driving voltage line and base voltage line, the system adapts the signal parameters to match the respective line levels, eliminating current instability while maintaining parasitic capacitance reduction benefits
2Ease of operation
If driving voltage and base voltage lines are supplied with different levels, then display driving is enabled, but power consumption increases due to level difference
Solution Approach 1:
The system employs periodic action by alternating between display driving mode and touch driving mode. During display driving, standard voltage levels are applied; during touch driving, level-matched touch power signals are applied. This periodic switching allows the system to optimize for different functions while minimizing overall power consumption through efficient voltage level management
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
The solution effectively reduces deviations between driving and base voltage lines, stabilizes driving current, and enhances touch sensitivity and image quality while minimizing power consumption.
Implementation Method 1
a parasitic capacitance is formed due to coupling between the touch electrode and the subpixel
Data Source
AI summary
A touch display device including a touch power signal generation circuit includes a display panel having a driving voltage line and a base voltage line for driving a light emitting element, a plurality of touch electrodes, and a subpixel, a touch circuit applying a touch driving signal to the plurality of touch electrodes and detecting touch sensing according to a change in capacitance, a touch power signal generation circuit applying a touch power signal having the same phase and amplitude as the touch driving signal to the driving voltage line and the base voltage line during a touch driving period, and a timing controller controlling the touch circuit and the touch power signal generation circuit.