Temperature Sensor with Touch Pressure Compensation
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Solution Overview
Problem
Recent display devices that measure biometric information, such as body temperature, often lack accuracy and reliability due to variations in user touch pressure, which affect the resistance value measurements of sensing elements.
Innovation Solution
A temperature sensor system that includes a first sensor to measure resistance values in different states, a second sensor to detect touch pressure, a compensator to calculate change rates and correct for pressure effects, and a temperature calculator to accurately determine body temperature by using look-up tables for precise calculations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a sensing element is used to measure resistance values for temperature detection, then temperature measurement capability is provided, but measurement precision deteriorates due to variations in user touch pressure
Solution Approach 1:
A pressure sensor is introduced as an intermediary device to detect touch pressure separately. The pressure sensor measures the pressure applied by the user, and this pressure information is used to compensate for the resistance value changes in the sensing element, thereby eliminating the harmful effect of pressure variations on temperature measurement accuracy.
Solution Approach 2:
The system implements feedback by continuously monitoring both the resistance value of the sensing element and the pressure applied by the user. The pressure information is fed back to adjust and compensate the temperature calculation, ensuring accurate temperature measurement regardless of varying touch pressure conditions.
2Measurement precision
If resistance value changes are used to determine temperature, then temperature sensing is achieved, but measurement precision worsens due to pressure-induced resistance variations
Solution Approach 1:
The pressure-induced resistance changes, which were originally harmful, are converted into a useful measurement parameter. By using the pressure sensor to detect touch pressure and incorporating this information into the temperature calculation through compensation, the system transforms the harmful pressure effect into a beneficial correction factor that improves measurement accuracy.
Solution Approach 2:
The system changes the parameter approach by introducing a new parameter (pressure) to the measurement system. Instead of relying solely on resistance value changes, the system now uses both resistance and pressure parameters to calculate temperature, thereby compensating for the harmful pressure effect on resistance measurements.
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 system improves the accuracy of temperature sensing by accounting for touch pressure changes, ensuring more reliable body temperature measurements in display devices.
Implementation Method 1
a first sensor including a sensing element configured to measure a first resistance value of the sensing element in a first state, and also configured to measure a second resistance value of the sensing element in a second state different from the first state
Implementation Method 2
a compensator configured to calculate a first change rate based on the first resistance value and the second resistance value, and also configured to calculate a change rate of a correction resistance value by correcting the first change rate based on the touch pressure
Data Source
AI summary
The temperature sensor includes a first sensor including a sensing element configured to measure a first resistance value of the sensing element in a first state, and also configured to measure a second resistance value of the sensing element in a second state different from the first state, a second sensor configured to measure a touch pressure corresponding to a user's touch input in the second state, a compensator configured to calculate a first change rate based on the first resistance value and the second resistance value, and also configured to calculate a change rate of a correction resistance value by correcting the first change rate based on the touch pressure, and a temperature calculator configured to calculate a temperature value based on the change rate of the correction resistance value.