Pressure sensor and pressure detection method

Abstract

The invention discloses a pressure sensor and a pressure detection method. The pressure sensor comprises: a liquid crystal box containing a cholesteric liquid crystal layer, a liquid crystal state detection module and a pressure query module. The liquid crystal box has a pressing surface; the liquid crystal state detection module is used for Detect the liquid crystal arrangement state in the cholesteric liquid crystal layer when the pressing surface of the liquid crystal cell is pressed; the pressure query module is used to query the pressing pressure corresponding to the liquid crystal arrangement state from the pre-stored correspondence table . The pressure sensor provided by the present invention is based on a liquid crystal cell containing a cholesteric liquid crystal layer, and its manufacturing process is a standard semiconductor process, especially suitable for a TFT-LCD production line process. The process has the characteristics of standardization, good process quality control and high production capacity. In addition, The pressure sensor has a wide range of applications and can be used to detect large-range and high-precision pressure change detection.

Description

technical field [0001] The invention relates to the field of sensors, in particular to a pressure sensor and a pressure detection method. Background technique [0002] Most of the existing pressure sensor detection principles are strain gauge type, piezoresistive type, inductive type, capacitive type, resonant type or thermocouple type, etc., mainly composed of mechanical structure or MEMS structure, mechanical process technology and MEMS technology The process is complex, the back-end process equipment is expensive, and the process accuracy is high, resulting in low production capacity, poor quality control, and high production costs. In addition, the finished pressure sensor has low integration and limited service life. Contents of the invention [0003] The present invention aims to solve at least one of the technical problems existing in the prior art, and proposes a pressure sensor and a pressure detection method. [0004] To achieve the above object, the present in...

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Problems solved by technology

[0002] Most of the existing pressure sensor detection principles are strain gauge type, piezoresistive type, inductive type, capacitive type, resonant type or thermocouple type, etc., mainly composed of mechanical structure or MEMS structure, mechanical process technology and MEMS technology The process is complex, the back-end process equipment is expensive, and the process accuracy is high, resulting in low production capacity, poor quality control, and high production costs.

In addition, the finished pressure sensor has low integration and limited service life

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