Flexible Display Substrate Pressure Sensor Deformation
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Solution Overview
Problem
Touch pressure detection sensitivity is insufficient in flexible display substrates due to small deformations of pressure sensors located in non-display areas, leading to inaccurate pressure detection when a finger presses the display area.
Innovation Solution
Incorporating a plurality of pressure sensors within the display area on a first flexible substrate, with a second flexible substrate covering them, ensuring larger deformations and higher sensitivity without affecting the aperture ratio, and optionally using bias and strain voltage signal lines between the substrates to enhance detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If pressure sensors are disposed in the non-display area, then the display area can be maximized, but the touch pressure detection sensitivity becomes insufficient
Solution Approach 1:
The patent introduces a second flexible substrate positioned above the first flexible substrate, creating a multi-layer structure. This dimensional addition allows the pressure sensors to be sandwiched between two flexible substrates, enabling them to experience larger deformations when the display panel is touched, thereby improving detection sensitivity without reducing the display area.
Solution Approach 2:
The patent employs flexible substrates with controlled rigidity characteristics. The second flexible substrate has different rigidity properties compared to the first, creating a compliant structure that amplifies deformation at the sensor location. This flexible film approach allows the sensors to detect touch pressure effectively while maintaining a large display area.
2Measurement precision
If pressure sensors are disposed in the display area, then touch pressure detection sensitivity is improved, but the aperture ratio is reduced
Solution Approach 1:
The patent uses flexible substrates that can be made transparent or translucent in the display area. The second flexible substrate covering the pressure sensors can be designed with optical transparency, allowing light to pass through while still providing mechanical support and strain amplification for the sensors. This resolves the conflict between sensor placement for sensitivity and maintaining aperture ratio.
3Measurement precision
If a second flexible substrate is added to cover the pressure sensors, then detection sensitivity is enhanced, but device complexity increases
Solution Approach 1:
The second flexible substrate serves multiple functions simultaneously: it provides mechanical support for the pressure sensors, amplifies deformation strain, protects the sensor structure, and can contribute to the display's flexibility and bending capabilities. By combining multiple functions into a single component, the patent minimizes the increase in device complexity while achieving improved sensitivity.
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 configuration enhances touch pressure detection sensitivity and maintains a large aperture ratio, ensuring accurate and sensitive pressure detection without compromising the display's performance.
Implementation Method 1
By detecting an in-plane deformation caused by a strain in a direction z
Implementation Method 2
the bridge strain sensor measures a resistance variation of the sensor to calculate the amount of the touch pressure
Data Source
AI summary
A display substrate, a display panel and a display device are provided. The display substrate includes a display area with a non-display area surrounding the display area first flexible substrate; a plurality of pressure sensors on the first flexible substrate and in the display area; and a second flexible substrate located at a side of the pressure sensors facing away from the first flexible substrate. The second flexible substrate covers the pressure sensors.