Touch Sensor Temperature Compensation for Ghost Touch Prevention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Display devices experience false touch inputs due to elevated temperatures, leading to degraded touch performance.
Innovation Solution
Incorporating a temperature sensor to determine reference values based on ambient temperature, allowing the controller to distinguish between actual and ghost inputs by using reference values instead of sensing values at elevated temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sensor driver uses sensing values from sensor electrodes to detect touch inputs, then touch input detection is enabled, but false touch inputs (ghost touches) occur at elevated temperatures
Solution Approach 1:
The patent changes the reference parameter from a fixed sensing value to a temperature-dependent reference value. The sensor driver stores multiple reference values corresponding to different temperature ranges and selects the appropriate reference value based on the detected temperature, thereby adapting the touch detection threshold to temperature conditions and eliminating ghost touches.
Solution Approach 2:
The patent implements a feedback mechanism where the sensor driver continuously monitors temperature via a temperature sensor, compares the current temperature with stored temperature ranges, and dynamically adjusts the reference value accordingly. This closed-loop feedback ensures that the touch detection system adapts to temperature changes in real-time.
2Device complexity
If the sensor driver uses a fixed reference value for touch detection, then the system structure is simple, but touch detection accuracy degrades at elevated temperatures
Solution Approach 1:
The patent applies preliminary action by pre-storing multiple reference values corresponding to different temperature ranges in the sensor driver's memory before operation. This allows the system to quickly select the appropriate reference value based on current temperature without requiring complex real-time calculations, thus maintaining system simplicity while improving accuracy.
3Measurement precision
If the sensor driver applies temperature compensation to sensing values, then touch detection accuracy at elevated temperatures is improved, but device complexity increases
Solution Approach 1:
The patent extracts the temperature compensation function into a separate temperature sensor module that works independently with the sensor driver. The temperature sensor detects temperature and provides this information to the sensor driver, which then selects the appropriate reference value. This modular extraction reduces the complexity burden on the main sensor driver while achieving temperature compensation.
Data Source
AI summary
A display device includes a display panel including pixels, a sensor array disposed on the display panel and including sensor electrodes, a sensor driver which detects a touch input using the sensor electrodes, and a temperature sensor for detecting a temperature of the sensor array. The sensor driver obtains a first sensing value from the sensor electrodes in a touch release state, and compares the first sensing value with a reference value corresponding to the temperature to determine whether the first sensing value includes an error. The sensor driver obtains a second sensing value from the sensor electrodes in a touch state. When it is determined that the first sensing value includes the error, the sensor driver detects the touch input based on the reference value and the second sensing value.