Pressure Sensor Noise Compensation in Touch Input Devices
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Solution Overview
Problem
Current touch input devices are unable to accurately detect pressure on a touch surface while compensating for display noise changes, which affects the reliability of touch position and pressure detection.
Innovation Solution
A touch input device is designed with a pressure sensing unit that includes a pressure sensor and a reference pressure sensor, where the difference in electrical characteristics between the two sensors is used to calculate the pressure applied, allowing for compensation of display noise changes by positioning the sensors relative to the point of pressure application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a pressure sensor is used to detect pressure on the touch surface, then pressure detection capability is improved, but display noise changes affect measurement accuracy
Solution Approach 1:
A reference pressure sensor is introduced as an intermediary element that does not detect actual pressure but instead measures display noise changes. This reference sensor's output serves as a mediator to compensate for noise affecting the main pressure sensor, allowing accurate pressure detection despite display fluctuations.
Solution Approach 2:
The system implements feedback by using the reference pressure sensor to continuously monitor display noise levels and feed this information back to compensate for noise effects on the main pressure sensor. This feedback mechanism enables real-time correction of measurement errors caused by display changes.
2Adaptability or versatility
If pressure sensing is added to the touch input device, then pressure detection function is improved, but device complexity increases
Solution Approach 1:
The reference pressure sensor serves multiple functions: it monitors display noise changes, provides compensation data, and helps maintain measurement accuracy. By making this component multi-functional, the system achieves pressure detection capability while managing complexity through efficient use of each sensor element.
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 solution enables accurate detection of pressure on a touch surface while minimizing the impact of display noise, enhancing the reliability of touch position and pressure detection in touch input devices.
Implementation Method 1
When a pressure is applied to the touch surface, the display panel is bent. Electrical characteristics detected at the pressure sensor change by the bending of the display panel.
Data Source
AI summary
A touch input device capable of detecting a pressure of a touch on a touch surface may be provided. The touch input device includes: a display panel; a substrate disposed under the display panel; and a pressure sensing unit. The pressure sensing unit includes a pressure sensor and a reference pressure sensor. When a pressure is applied to the touch surface, the display panel is bent. Electrical characteristics detected at the pressure sensor change by the bending of the display panel. A magnitude of the pressure applied to the touch surface is calculated based on a difference between a reference electrical characteristic calculated from electrical characteristics detected at the reference pressure sensor and the detected electrical characteristic calculated from the electrical characteristics detected at the pressure sensor.