Touch Display Driving Circuit Sync Signal Pulse Waveform Control
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Solution Overview
Problem
Existing touch display devices face high current consumption due to continuous voltage changes when supplying touch driving signals and force touch driving signals, which are necessary for sensing touch and force touch interactions.
Innovation Solution
A touch display device with a driving circuit that changes the pulse waveform of a sync signal between high and low logic levels to control both touch driving signals and force touch driving signals, reducing unnecessary power consumption by adjusting the frequency based on touch presence or absence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If touch driving signal and force touch driving signal are supplied continuously, then touch sensing and force touch sensing functions are maintained, but current consumption increases
Solution Approach 1:
The patent applies periodic action by dividing the operation into distinct periods: during touch sensing periods, touch driving signals are supplied to maintain touch sensitivity; during non-touch periods, these signals are suspended to reduce current consumption. The force touch driving signals are supplied continuously or periodically depending on the implementation, enabling the system to alternate between active sensing and low-power states while maintaining both touch and force touch functionality.
2Ease of operation
If sync signal pulse waveform changes frequently between high and low logic levels, then touch driving signal and force touch driving signal can be controlled, but voltage changes continuously causing increased current consumption
Solution Approach 1:
The sync signal is designed to change its pulse waveform characteristics periodically based on the operational phase. During touch sensing periods, the sync signal enables touch driving signals with appropriate pulse characteristics. During non-touch periods, the sync signal transitions to a state that reduces or eliminates touch driving signals while maintaining force touch capability, thereby reducing voltage changes and current consumption while preserving signal control functionality.
Solution Approach 2:
The sync signal dynamically adjusts its pulse waveform characteristics based on real-time sensing requirements. The system monitors touch conditions and modifies the sync signal's logic level transitions accordingly, making the signal behavior adaptive rather than fixed, which optimizes the balance between control capability and power consumption.
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 reduces power consumption while maintaining touch and force touch sensing capabilities, improving efficiency and extending battery life in touch display devices.
Implementation Method 1
a driving circuit for sensing a change of capacitance between the plurality of touch electrodes and the housing plate in accordance with a distance change between the plurality of touch electrodes and the housing plate
Data Source
AI summary
A touch display device, as well as its driving method, is capable of supplying a touch driving signal for touch sensing and a force touch driving signal for force touch sensing, while also reducing current consumption. A driving circuit of the touch display device changes the number of changing a pulse waveform of a sync signal between a high logic level and a low logic level, wherein the sync signal is provided to control a touch driving signal supplied to a plurality of touch electrodes, and a force touch driving signal supplied to a display module.