Pressure Sensor Supporting Layer for Display Device
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Solution Overview
Problem
Existing display devices with integrated pressure sensors face reliability issues due to mechanical tolerances and processing errors, which affect the accuracy and durability of pressure detection.
Innovation Solution
A display device design that includes a pressure sensor with a supporting layer, where the supporting layer is more rigid than the pressure sensor and is disposed on its surface, allowing for improved pressure detection even when the sensor is not fixed to the middle frame, and a receiving groove in the middle frame to accommodate the pressure sensor and supporting layer, enhancing reliability and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the pressure sensor is directly fixed to the middle frame, then the structural stability is improved, but the reliability deteriorates due to mechanical tolerances and processing errors causing damage and malfunction
Solution Approach 1:
A supporting layer is introduced as an intermediary component between the pressure sensor and the middle frame. This supporting layer has a receiving groove that accommodates the pressure sensor, providing mechanical support while isolating the sensor from direct contact with the middle frame. This mediation eliminates the harmful effect of mechanical tolerances and processing errors that would otherwise cause damage or malfunction to the pressure sensor.
2Length of moving object
If the pressure sensor is made thinner to reduce device thickness, then the compactness is improved, but the manufacturing precision deteriorates due to increased sensitivity to mechanical tolerances and processing errors
Solution Approach 1:
The supporting layer acts as a mediator that compensates for the reduced thickness of the pressure sensor. By providing a rigid structural base with a precisely formed receiving groove, the supporting layer ensures that even thin pressure sensors are properly positioned and supported, maintaining manufacturing precision and pressure detection accuracy despite the reduced sensor thickness.
Solution Approach 2:
The system combines the pressure sensor with the supporting layer to form a composite structure. The supporting layer, made from a material with appropriate mechanical properties, compensates for the limitations of thin pressure sensors by providing the necessary structural support and positioning, thereby maintaining manufacturing precision while enabling reduced overall thickness.
3Strength
If the pressure sensor is made thicker to improve durability, then the strength is improved, but the device complexity increases due to additional layers and structures
Solution Approach 1:
The structural support function is segmented from the pressure sensor itself and assigned to a separate supporting layer. This segmentation allows the pressure sensor to maintain optimal thickness for its sensing function while the supporting layer provides the necessary durability and structural support, thereby improving strength without significantly increasing overall device complexity.
Solution Approach 2:
The supporting layer serves multiple functions: it provides structural support, positions the pressure sensor accurately, protects the sensor from damage, and integrates with the middle frame. By consolidating these multiple functions into a single component, the design improves durability without proportionally increasing device complexity.
4Measurement precision
If the supporting layer is made more rigid to improve pressure detection accuracy, then the measurement precision is improved, but the ease of manufacture deteriorates due to stricter material and processing requirements
Solution Approach 1:
The supporting layer is constructed from composite materials or materials with specific mechanical properties that provide the necessary rigidity for accurate pressure detection. By selecting appropriate materials and optimizing the layer composition, the design achieves high measurement precision while maintaining reasonable ease of manufacture through standard fabrication processes.
Data Source
AI summary
A display device includes: a display panel; a pressure sensor disposed below the display panel, the pressure sensor configured to detect pressure applied to the display panel; and a supporting layer disposed on a surface of the pressure sensor facing away from the display panel.