Touch Display Pulse Weighting for Accurate Low-Power Sensing
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Solution Overview
Problem
Existing touch display devices face challenges in providing accurate touch sensing performance and high-quality image display while minimizing power consumption.
Innovation Solution
A touch display device and weighted touch sensing method that includes a display panel with overlapping touch electrodes and a touch driving circuit, which supplies touch driving signals with varying numbers of pulses in different sensing sub-periods based on the presence of a valid touch, thereby optimizing power usage and sensing accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a fixed number of pulses is supplied to all sensing units in each frame, then the touch sensing operation is simple and consistent, but power consumption cannot be optimized and sensing accuracy may be compromised for invalid touch areas
Solution Approach 1:
The patent applies dynamics by making the number of pulses supplied to each sensing unit variable rather than fixed. The touch controller dynamically adjusts the pulse count based on touch detection results from previous frames, supplying more pulses to sensing units with valid touch and fewer pulses to those without touch, thereby optimizing power consumption while maintaining sensing accuracy where needed.
Solution Approach 2:
The patent implements local quality by applying different pulse quantities to different sensing units based on their individual touch states. Instead of using a uniform pulse count for all sensing units, the system tailors the pulse number locally to each sensing unit's requirements, reducing power consumption in areas without touch while maintaining adequate sensing capability in areas with touch.
2Measurement precision
If the number of pulses is increased for all sensing units, then touch sensing accuracy is improved, but power consumption increases
Solution Approach 1:
The patent applies local quality by differentiating the pulse quantity supplied to each sensing unit based on its touch state. Sensing units with valid touch receive a larger number of pulses to ensure accurate touch detection and measurement, while sensing units without touch receive fewer pulses, thereby maintaining high sensing accuracy where needed while reducing overall power consumption.
Solution Approach 2:
The patent implements partial action by supplying excessive pulses (larger number) only to sensing units that require it (those with valid touch), rather than supplying excessive pulses to all sensing units. This selective approach ensures adequate sensing accuracy for touch areas while avoiding unnecessary power consumption in non-touch areas.
3Use of energy by moving object
If the number of pulses is decreased for all sensing units, then power consumption is reduced, but touch sensing accuracy deteriorates
Solution Approach 1:
The patent applies local quality by selectively reducing the pulse number only for sensing units without valid touch, while maintaining adequate pulse counts for sensing units with touch. This differentiated approach allows power consumption to be reduced in non-touch areas without compromising sensing accuracy in areas where touch is detected.
Solution Approach 2:
The patent implements partial action by applying the reduced pulse strategy only partially - specifically to sensing units without touch - while maintaining normal or increased pulse counts for sensing units with touch. This selective reduction achieves power savings without sacrificing overall sensing accuracy.
Data Source
AI summary
A touch display device and a weighted touch sensing method of a touch controller for providing an accurate touch sensing performance and a high quality of image display are disclosed. The touch display device may include a display panel in which a plurality of subpixels are disposed and a plurality of touch electrodes overlapping one or more of the plurality of subpixels are disposed, and a touch driving circuit configured to supply a touch driving signal including a plurality of pulses to one or more of the plurality of touch electrodes, the touch driving circuit configured to output respective touch driving signals having different numbers of pulses in a first sensing sub-period and a second sensing sub-period in the period of one frame.