Touchscreen Interference Baseline Sensing for Faster Touch Detection
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Solution Overview
Problem
Modern touch screens face interference issues from high driving voltages of gate terminals, particularly in internally embedded types, which exacerbate electromagnetic interference and reduce the time available for touch sensing, leading to competition with display refreshing and lower touch sensing rates.
Innovation Solution
A touch sensitive processing method that utilizes synchronization signals to identify gate driving signal interference periods, performs mutual capacitance sensing during these periods to generate baseline interference images, and calculates object positions based on difference images, allowing touch sensing to occur despite interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If touch sensing is performed during gate driving signal interference periods, then touch sensing rate is improved, but electromagnetic interference from gate driving signals increases
Solution Approach 1:
The system performs preliminary actions by capturing baseline interference images during gate driving signal interference periods before actual touch sensing is needed. These baseline images characterize the electromagnetic interference pattern, allowing the system to prepare compensation data in advance and perform accurate touch sensing at higher rates without being disrupted by the interference.
Solution Approach 2:
The patent converts the harmful electromagnetic interference from gate driving signals into a beneficial reference framework. By capturing and analyzing the interference pattern during these periods, the system creates baseline images that actually enable accurate touch detection. The interference that would normally degrade performance is instead used to establish a reference for compensation, allowing high-rate touch sensing to proceed accurately.
2Illumination intensity
If refresh rate of display is increased, then display quality is improved, but time available for touch sensing is reduced
Solution Approach 1:
The system performs preliminary characterization of electromagnetic interference during display refresh cycles, capturing baseline interference images before touch sensing is required. This preliminary action allows the system to prepare compensation data in advance, enabling accurate touch sensing to occur during minimal time windows without delaying display refresh, thus maintaining high display quality while preserving touch responsiveness.
Solution Approach 2:
The patent enables continuous touch sensing capability by performing baseline interference capture and compensation calculation in a continuous manner throughout the display refresh cycle. Rather than stopping touch sensing for display updates, the system continuously maintains the ability to detect and compensate for interference, ensuring both high refresh rate display quality and continuous touch responsiveness without time loss.
3Length of stationary object
If internally embedded touch screen structure is used, then device thickness is reduced, but electromagnetic interference from gate driving signals increases
Solution Approach 1:
The system performs preliminary capture and characterization of electromagnetic interference patterns during gate driving signal cycles, creating baseline interference images that document the interference signature. This preliminary action enables the system to later compensate for the interference accurately, allowing internally embedded touch screens with reduced thickness to operate reliably despite the proximity of gate driving signals to touch electrodes.
Solution Approach 2:
The patent converts the intensified electromagnetic interference caused by the compact internally embedded structure into a beneficial reference framework. By capturing and analyzing the interference pattern during operation, the system creates baseline images that actually enable accurate touch detection. The proximity-induced interference that would normally degrade performance is instead used to establish a reference for compensation, allowing thin-device touch sensing to proceed accurately.
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 method reduces electromagnetic interference from gate driving signals and maintains or increases the rate of touch sensitive reports by optimizing touch sensing during interference periods.
Implementation Method 1
performing a mutual capacitance sensing during one of the gate driving signal interference periods to generate a first sensing image
Data Source
AI summary
A touch sensitive processing method, comprising: receiving a synchronization signal corresponding to a frame of a touch screen; calculating multiple gate driving signal interference periods of the touch screen according to the synchronization signal; performing a mutual capacitance sensing during one of the gate driving signal interference periods to generate a first sensing image; calculating one or more first positions where one or more external conductive objects approaching or touching the touch screen based on a difference image between the first sensing image and a baseline interference image; and reporting the one or more first positions to a host.