Biometric Sensor Adhesive Gap Stabilization
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Solution Overview
Problem
Biometric sensors, particularly optical sensors, face performance degradation due to changes in the distance between the display and sensor caused by external shocks or aging, and the presence of foreign objects, which can lead to inaccurate readings and reduced reliability.
Innovation Solution
Incorporating a biometric sensor module on the rear surface of the display panel with a first adhesive member filling a cap between the display and sensor, and a second adhesive member applied on top, to maintain a stable distance and prevent foreign objects from entering the gap, ensuring consistent performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the optical sensor is placed close to the display to maintain stable distance, then measurement precision is improved, but foreign objects can easily enter the gap between display and sensor
Solution Approach 1:
The patent implements a multi-layer nested structure where the optical sensor is positioned within a recessed cavity formed in the display assembly. The sensor is further protected by adhesive layers and sealing structures that create nested barriers, preventing foreign objects from reaching the sensor while maintaining the required optical distance for accurate fingerprint detection.
Solution Approach 2:
The patent introduces adhesive members as intermediary elements between the display and the optical sensor. These adhesive layers serve as mediators that maintain a precise, stable distance for optical measurement while simultaneously acting as barriers that prevent dust and foreign objects from entering the gap between the display and sensor.
2Reliability
If the distance between display and sensor is increased to prevent foreign object entry, then reliability is improved, but measurement precision deteriorates
Solution Approach 1:
The patent employs preliminary action by pre-forming a recessed cavity structure in the display assembly before mounting the optical sensor. This pre-configured structure predeterminedly establishes the optimal distance for optical measurement and creates built-in protection against foreign object contamination, ensuring both precision and reliability from the outset without requiring additional adjustment mechanisms.
3Manufacturing precision
If adhesive members are used to maintain distance and seal the gap, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple functions into the adhesive members: they simultaneously serve as bonding agents to attach the sensor, as spacers to maintain precise distance for optical measurement, and as sealing materials to prevent foreign object contamination. This consolidation of multiple functions into a single component simplifies the overall assembly process while maintaining high manufacturing precision.
Data Source
AI summary
An electronic device according to various embodiments of the present invention comprises: a display panel; a biometric sensor module disposed on the back surface of the display panel; a processor electrically connected to the display panel and the biometric sensor module, and configured to acquire biometric information by using the biometric sensor module; a first adhesive member filling the gap formed between the back surface of the display panel and the biometric sensor module; and a second adhesive member applied on the first adhesive member, wherein the biometric sensor module can be attached to the back surface of the display panel by using the second adhesive member. In addition, other embodiments are possible.