Touch Screen Bridge Control for Temperature Compensation
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Solution Overview
Problem
Conventional touch screens using indium tin oxide (ITO) materials face issues with temperature-induced resistance changes, leading to incorrect voltage signal outputs and false user input detection, degrading user experience.
Innovation Solution
A method and device for controlling touch screens that utilize a bridge formed by touch sub-units connected in series, applying a driving voltage to determine an equivalent resistance value and compensation voltage, and triggering touch units based on a voltage sum that accounts for temperature changes, thereby eliminating false reporting points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If indium tin oxide (ITO) material is used as the touch unit material, then the touch screen can achieve basic touch functionality, but the resistance changes with temperature causing incorrect voltage signal output and false touch detection
Solution Approach 1:
The patent applies parameter changes by introducing temperature compensation through voltage adjustment. The control chip calculates compensation voltage values based on temperature changes and adjusts the driving voltage accordingly, transforming the resistance-voltage relationship to maintain accurate touch detection despite temperature-induced resistance variations in the ITO material
Solution Approach 2:
The patent implements feedback by continuously monitoring the voltage output of the touch unit and comparing it with expected values. The control chip receives voltage signals from the touch unit, determines temperature-induced deviations, calculates compensation values, and adjusts subsequent voltage outputs, creating a closed-loop system that eliminates false touch detections caused by temperature changes
2Ease of operation
If the touch unit outputs voltage signals based on driving voltage, then touch input can be detected, but temperature changes cause the same driving voltage to produce different voltage signals leading to control chip misjudgment
Solution Approach 1:
The patent applies preliminary action by pre-calculating compensation voltage values based on temperature changes before actual touch detection. The control chip determines the compensation voltage in advance according to the temperature difference, then applies this compensation to the driving voltage, ensuring that the voltage signal remains accurate even before temperature-induced resistance changes affect the measurement
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 effectively compensates for temperature-induced voltage changes, improving user experience by accurately detecting touch inputs and reducing false reporting points.
Implementation Method 1
The indium tin oxide material has a resistance temperature change characteristic, that is, when the ambient temperature changes or the touch unit itself generates heat and the temperature changes, the resistance of the indium tin oxide material changes accordingly
Data Source
AI summary
The present disclosure provides a method and device for controlling a touch screen, and an electronic device. The method includes: applying a first driving voltage to a voltage input terminal of the bridge, and obtaining a first voltage difference between a first voltage output terminal and a second voltage output terminal of the bridge corresponding to the first driving voltage; determining a first equivalent resistance value of the bridge corresponding to the first driving voltage at a current temperature according to the first driving voltage and a preset equation; determining a first compensation voltage value corresponding to the current temperature according to the first equivalent resistance value, the first voltage difference, and a preset formula; determining whether to trigger a touch unit corresponding to the bridge according to the first voltage difference and the first compensation voltage value.