Semiconductor Pressure Sensors for Touch Display Panel Integration
Solution Overview
Problem
Existing touch display panels face challenges in integrating pressure sensors due to their large size requirement for strong signal detection, which hinders their integration into compact devices.
Innovation Solution
The use of at least two semiconductor pressure sensors with bias voltage applying and voltage detecting circuits, allowing for smaller size and easier integration while providing high strain voltage and automatic temperature compensation, enabling effective touch pressure calculation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If piezoresistive pressure sensors are used with large size to detect strong signals, then signal detection capability is improved, but integration difficulty into touch display panel increases
Solution Approach 1:
The patent changes the material parameter from conventional piezoresistive materials to semiconductor materials, which have inherently higher piezoresistive coefficients. This parameter change enables the sensor to generate stronger strain signals at much smaller sizes, resolving the contradiction between signal detection capability and integration difficulty
Solution Approach 2:
The patent replaces the conventional mechanical Wheatstone bridge configuration with an electrical field-based detection system using semiconductor pressure sensors. This substitution allows for smaller sensor dimensions while maintaining or improving signal detection capability, thereby reducing integration difficulty
2Ease of manufacture
If pressure sensor size is reduced for easier integration, then integration ease is improved, but signal strength decreases
Solution Approach 1:
By changing the material parameter to semiconductor materials with higher piezoresistive coefficients, the sensor can maintain strong signal output at reduced sizes, simultaneously improving integration ease while preserving signal strength
Solution Approach 2:
The patent uses composite semiconductor material structures that combine high piezoresistive properties with compatible electrical characteristics, enabling small-sized sensors to generate sufficient strain signals for accurate pressure detection while facilitating easy integration
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 allows for the integration of sensitive touch pressure sensors into touch display panels, enhancing sensitivity and reducing manufacturing complexity and cost, while maintaining accurate temperature compensation.
Implementation Method 1
a piezoresistive pressure sensor used in a touch display panel is mainly formed by connecting strain electrical gauges according to a Wheatstone bridge principle
Data Source
AI summary
The embodiment of the disclosure discloses a touch substrate, a touch display panel and a method for calculating touch pressure. The touch substrate comprises at least two semiconductor pressure sensors, a bias voltage applying circuit and a voltage detecting circuit, wherein the bias voltage applying circuit is used for applying bias voltage to each semiconductor pressure sensor; the voltage detecting circuit is used for acquiring strain voltages of each semiconductor pressure sensor. A first straight line connecting the first connecting terminal and the second connecting terminal intersects a second straight line connecting the third connecting terminal and the fourth connecting terminal. According to the technical scheme of the disclosure, the semiconductor pressure sensors can be integrated inside the touch display panel.