Liquid Crystal Display Pressure Sensing via Capacitance Detection
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Solution Overview
Problem
Current liquid crystal display technologies can only determine two-dimensional touch coordinates and lack the capability for three-dimensional pressure sensing, limiting their functionality and human-computer interaction.
Innovation Solution
A method and device that utilize a transparent electrode array in a liquid crystal display to detect capacitance values between the electrode and a support array, allowing for the determination of pressure values by calculating changes in capacitance, enabling three-dimensional pressure sensing and improved interaction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a touch panel is added on the liquid crystal display to enable touch location sensing, then two-dimensional touch coordinates can be determined, but three-dimensional pressure sensing capability is still lacking
Solution Approach 1:
The patent extends the sensing capability from two-dimensional touch coordinates to three-dimensional pressure sensing by utilizing the liquid crystal layer as an additional sensing dimension. The liquid crystal layer's optical properties change in response to pressure, enabling the system to detect pressure values in addition to touch location, thus adding a third dimension to the sensing capability.
Solution Approach 2:
The liquid crystal display serves multiple functions: it acts as both the display medium and the pressure sensing element. By integrating the pressure sensing function into the liquid crystal layer, the system achieves multi-functionality without requiring separate pressure sensing hardware, thereby resolving the contradiction between maintaining simplicity and enhancing versatility.
2Measurement precision
If transparent electrodes are arranged in the liquid crystal layer for capacitance detection, then pressure values can be determined through capacitance changes, but the device complexity increases
Solution Approach 1:
The patent combines the transparent electrodes with the existing liquid crystal display structure, integrating the pressure sensing function into the display itself. The electrodes are arranged within the liquid crystal layer, merging the display and sensing functions into a single integrated structure, thereby reducing overall device complexity while enabling precise pressure detection.
Solution Approach 2:
The liquid crystal layer itself serves as the sensing medium, utilizing its inherent optical properties that change in response to pressure. This self-service approach eliminates the need for separate complex sensing mechanisms, as the liquid crystal material naturally responds to pressure changes through optical property variations that can be detected by the integrated electrodes.
3Productivity
If capacitance detection is performed during the liquid crystal display operation, then real-time pressure sensing is achieved, but display performance may be affected
Solution Approach 1:
The patent implements capacitance detection at specific intervals or during designated time windows within the display operation cycle. By using periodic action rather than continuous detection, the system achieves real-time pressure sensing capability while minimizing interference with the display's normal operation, thus maintaining display performance reliability.
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
Enables the detection of pressure values, enhancing functionality beyond traditional touch sensing and improving human-computer interaction by providing three-dimensional pressure sensing capabilities.
Implementation Method 1
detecting a capacitance value between the transparent electrode and a support array in the liquid crystal layer of the liquid crystal display
Data Source
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AI summary
The present disclosure relates to a method and a device for detecting pressure in a mobile terminal. The method includes: detecting a capacitance value between the transparent electrode and a support array in the liquid crystal layer of the liquid crystal display; and determining a pressure value performed by an operating member on the liquid crystal display according to the capacitance value detected. With the technical solution of the present disclosure, the pressure value on the liquid crystal display is determined by detecting the capacitance value between the transparent electrode and the support array in the liquid crystal layer of the liquid crystal display, such that detecting a third dimension pressure sensing other than touch sensing in the liquid crystal display is realized, more functions may be realized according to the pressure value detected, and human-computer interaction is improved.