Bridge-Type Strain Sensors for Narrow Frame Touch Detection
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Solution Overview
Problem
Existing touch-control display panels face challenges in efficiently detecting touch forces due to the need for excessive wiring from bridge-type strain sensors, which contradicts the trend of using narrow frames in electronic devices, and the inability to directly fabricate voltage comparators.
Innovation Solution
The implementation of bridge-type strain sensors in the non-display area of display panels, connected via a common output line and power supply voltage, with switch units controlled by a control signal, allowing for reduced wiring and improved sensitivity in touch-force detection without affecting display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If bridge-type strain sensors are used with two signal lines for each sensor, then touch-force detection capability is achieved, but the number of wirings becomes excessive and frame width increases
Solution Approach 1:
Multiple strain sensors share common signal lines (first common output line and second common output line) instead of having dedicated lines for each sensor. The patent combines the output lines of multiple sensors into shared common lines, significantly reducing the total number of wirings required while maintaining the ability to detect touch force at multiple locations through sequential scanning
Solution Approach 2:
The patent introduces switch units that can dynamically connect different sensors to common signal lines based on control signals. This dynamic switching allows the system to multiplex the use of common output lines across multiple sensors, reducing wiring complexity while preserving individual sensor measurement capability through time-division multiplexing
2Illumination intensity
If bridge-type strain sensors are disposed in the non-display area, then display quality is maintained, but the number of wirings still increases frame width
Solution Approach 1:
The patent merges multiple sensor output lines into shared common output lines, allowing sensors in the non-display area to communicate with the control circuit using fewer wiring resources. This combining approach reduces the wiring burden while sensors remain positioned in the non-display area to preserve display quality
3Ease of manufacture
If voltage comparators are directly fabricated in the display panel, then integration is improved, but manufacturing complexity increases due to process limitations
Solution Approach 1:
The patent introduces switch units as intermediary components between the strain sensors and the external control circuit. These switches enable signal routing and multiplexing, allowing the system to achieve high integration without requiring complex voltage comparator fabrication processes within the display panel itself. The intermediary switches simplify the manufacturing process while maintaining integration benefits
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 enhances the sensitivity of touch-force detection while minimizing the number of wirings, thus reducing frame widths and aligning with the trend of narrow frames in electronic devices, without compromising display performance.
Implementation Method 1
Bridge-type strain sensors can calculate a touch-control force by detecting in-plane deformation induced by a strain along the Z direction and measuring the change in the resistance of sensors
Implementation Method 2
detecting in-plane deformation induced by a strain along the Z direction and measuring the change in the resistance of sensors
Data Source
AI summary
A display panel and a touch-control force detection method are provided. The display panel comprises a display area, a non-display area surrounding the display area, and a plurality of bridge-type strain sensors disposed in the non-display area of the display panel. The bridge-type strain sensor comprises a first output terminal electrically connected to a first common output line, a second output terminal electrically connected to a second common output line, a first input terminal electrically connected to a first power supply voltage, a second input terminal electrically connected to a second power supply voltage, and a first switch unit.