Pressure Sensor Nested in Display Device for Tolerance-Free Sensing
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Solution Overview
Problem
The existing pressure detection structures in touch devices face challenges in maintaining consistency and reliability due to assembly tolerance issues between the display screen and pressure sensor, leading to varying user experiences and product reliability.
Innovation Solution
A pressure detection structure where the pressure sensor is integrated within the display device, utilizing an electrically conductive member or middle frame as a reference electrode, with a variable gap allowing for accurate capacitance-based pressure sensing independent of assembly tolerances, enabling testing and production efficiency improvements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the pressure sensor and display screen are assembled with a gap in the middle frame, then pressure detection can be performed, but the detection spacing is subject to assembly tolerance leading to inconsistent user experience
Solution Approach 1:
The pressure sensor is integrated within the display device structure, merging two previously separate components (pressure sensor and display screen) into a single unified assembly. This eliminates the gap between them and removes assembly tolerance issues, ensuring consistent pressure detection across all products.
Solution Approach 2:
The pressure sensor is nested inside the display device housing, with the reference electrode positioned within the display structure. This nested arrangement ensures fixed relative positioning between the pressure sensor and reference electrode, eliminating variability caused by external assembly tolerances.
2Ease of manufacture
If the pressure sensor is mounted separately from the display device, then assembly is simpler, but the spacing between components varies due to tolerance affecting detection consistency
Solution Approach 1:
By combining the pressure sensor and display device into a single integrated structure, the patent eliminates the need for separate mounting and gap control. The unified design maintains precise spacing automatically through its construction, achieving both manufacturing simplicity and precision.
3Measurement precision
If the detection spacing is controlled tightly, then pressure detection accuracy improves, but more working processes and parts are required increasing complexity
Solution Approach 1:
The integration of the pressure sensor within the display device eliminates the need for separate spacing control mechanisms, additional parts, and complex assembly processes. The unified structure maintains consistent detection spacing through its design rather than through controlled assembly variations.
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 ensures consistent pressure sensing across touch devices by controlling tolerance factors within the display module, reducing assembly impacts and allowing individual display device testing before assembly, thereby enhancing product reliability and production efficiency.
Implementation Method 1
the pressure sensor outputs a pressure signal according to variation of capacitance between a sensing electrode thereof and the reference electrode
Implementation Method 2
when a force is applied to the cover 1, the cover 1 deforms, such that the spacing between the pressure sensor 3 and the display screen 2 is changed
Data Source
AI summary
A pressure detection structure and a touch device are disclosed. The structure is mounted on a middle frame of the touch device and includes a cover, a display device and a pressure sensor. The display device is arranged below the cover, and includes a display module. The pressure sensor is arranged in the display device; any electrically conductive member in the display device or the middle frame which is electrically conductive is used as a reference electrode; and a variable gap is present between the pressure sensor and the reference electrode, and the pressure sensor outputs a pressure signal according to variation of capacitance between a sensing electrode thereof and the reference electrode. According to the present application, pressure detection may be carried out accurately, and thus reliability of products is enhanced.