Touch Screen Temperature Status Determination via Capacitance Node Sampling
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Solution Overview
Problem
Touch screens experience performance issues due to temperature changes, leading to false reporting of touch events (pop-up and disappearing points), which disrupt normal touch control logic and user experience.
Innovation Solution
A method and apparatus for determining the temperature status of a touch screen by sampling characteristic values from capacitance nodes, calculating raw characteristic values, and preprocessing them to determine the touch screen's temperature status, thereby preventing abnormal touch event reporting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If touch screen operates in different environmental temperatures, then touch performance varies, but false reporting and disappearing points occur
Solution Approach 1:
The system performs preliminary temperature monitoring by sampling characteristic values from capacitance nodes before actual touch events occur. This preliminary temperature status determination allows the system to predict and compensate for temperature-induced variations, preventing false reporting and disappearing points before they happen.
Solution Approach 2:
The system continuously monitors characteristic values from capacitance nodes and uses this feedback to determine temperature status. This feedback mechanism allows real-time adjustment and compensation for temperature variations, maintaining reliable touch event reporting across different environmental conditions.
2Measurement precision
If temperature monitoring is implemented, then touch screen temperature status can be determined, but system complexity increases
Solution Approach 1:
The system uses existing capacitance nodes in the touch screen, which serve dual purposes: normal touch detection and temperature monitoring. By sampling characteristic values from these multi-functional nodes, the system achieves temperature status determination without adding dedicated temperature sensing components, thus avoiding increased device complexity.
Solution Approach 2:
The touch screen's existing capacitance nodes and control circuitry are used to monitor temperature status. The system leverages its own internal resources for temperature monitoring rather than requiring external temperature sensors or additional complex monitoring systems.
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 avoids abnormal touch event reporting and maintains normal touch control logic by accurately determining the temperature status of the touch screen, improving user experience.
Implementation Method 1
upper capacitance nodes of the touch screen are inconsistently affected by the temperature
Implementation Method 2
positions of these capacitance nodes on the touch screen are not actually touched by fingers or touched or approached by other objects that cause changes in the electric field
Data Source
AI summary
A method, apparatus, touch chip, and electronic device for determining a temperature status of a touch screen. The method for determining a temperature status of a touch screen includes: determining, based on a plurality of sampled characteristic values of each temperature monitoring node in each sampling period, a raw characteristic value of the temperature monitoring node in a the sampling period, the temperature monitoring being selected from a plurality of capacitance nodes in a touch array; and calculating, based on raw characteristic values of all temperature monitoring nodes in each sampling period, a raw characteristic statistic value in each sampling period, and determining the temperature status of the touch screen based on a raw characteristic statistic values in sampling periods.