Gas Cell Pressure Sensing Panel for Accurate Force Touch Detection
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Solution Overview
Problem
Current force touch technologies in electronic devices, such as smart watches and smartphones, lack the necessary accuracy and sensitivity due to their capacitive or resistive implementations, which are prone to interference from electromagnetic signals.
Innovation Solution
A pressure sensing panel with a gas cell layer and gas pressure sensors is used, where the panel includes a carrying substrate with gas cells sealed with a predetermined amount of gas and sensors, allowing for accurate force level detection by measuring gas pressure changes without electromagnetic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If capacitive or resistive touch techniques are used, then touch control can be implemented, but high accuracy and sensitivity cannot be achieved due to electromagnetic signal interference
Solution Approach 1:
The patent replaces electromagnetic-based capacitive or resistive touch detection with a pneumatic system using gas cells and pressure sensors. When a user touches the display, the touch force compresses the gas cell, changing gas pressure which is detected by the pressure sensor. This mechanical-pneumatic substitution eliminates susceptibility to electromagnetic interference while maintaining touch detection functionality.
Solution Approach 2:
The patent employs gas cells filled with predetermined amounts of gas as the sensing medium. The gas cells are sealed and connected to pressure sensors that detect changes in gas pressure caused by touch forces. This pneumatic approach provides immunity to electromagnetic interference and enables accurate force touch detection through pressure measurements.
2Object-affected harmful factors
If gas cells with predetermined gas amounts are sealed inside the panel, then electromagnetic interference is eliminated, but device structure becomes more complex
Solution Approach 1:
The patent integrates the gas cells directly into the display panel structure, combining the display function with the force touch sensing function. The gas cells are positioned between the display panel and the user interface, allowing the same structural layer to serve both display and sensing purposes, thereby reducing overall device complexity despite adding pneumatic functionality.
Solution Approach 2:
The gas cell layer serves multiple functions: it acts as the force touch sensing element, provides a sealed environment for the gas, and integrates with the display panel structure. This multi-functionality reduces the need for separate components and simplifies the overall device architecture while eliminating electromagnetic interference.
3Measurement precision
If gas pressure sensors are placed inside sealed gas cells, then force level detection accuracy is improved, but manufacturing process becomes more difficult
Solution Approach 1:
The patent specifies that gas cells are pre-filled with predetermined amounts of gas before final sealing. This preliminary action ensures that each gas cell starts with a known, controlled gas quantity, which is critical for accurate force level detection. By establishing the gas amount beforehand, the system achieves high measurement precision while simplifying the manufacturing process through standardized pre-filling procedures.
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 solution provides high accuracy and sensitivity in force touch detection, enabling precise control of display device operations by distinguishing between tap and press operations based on gas pressure differences, while being immune to electromagnetic interference.
Implementation Method 1
at least one gas pressure sensor is provided inside each gas cell
Implementation Method 2
the gas cell layer includes at least one gas cell each having a predetermined amount of gas sealed therein
Data Source
AI summary
The present invention provides a pressure sensing panel, which includes a carrying substrate, a gas cell layer formed on the carrying substrate and a gas pressure sensor, wherein the gas cell layer includes at least one gas cell, a predetermined amount of gas is sealed in each gas cell, and at least one gas pressure sensor is provided inside each gas cell. The present invention further provides a display device, a method for fabricating the pressure sensing panel and a force touch method using the display device. In the present invention, deformation of the gas cell is physical deformation, which is hardly affected by the surroundings, so the level of force applied to the display device can be determined accurately by using the pressure sensing panel provided by the present invention, and further, operation can be performed accurately.