Flexible Fingerprint Sensor Assembly for Distortion-Free Display Integration
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Solution Overview
Problem
Existing display apparatuses with integrated fingerprint sensors face reliability issues due to pressure-induced stains and distortions on the display panel when the fingerprint sensor assembly is assembled, which can compromise image quality.
Innovation Solution
A display apparatus design featuring a flexible sensing circuit board with specific edge curvatures and an adhesive pattern located between the cover panel and the circuit board, minimizing pressure transmission to the display panel and preventing adhesive contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the fingerprint sensor assembly is assembled with a rigid structure, then the fingerprint sensor can be securely mounted, but pressure is transmitted to the display panel causing stains and distortions
Solution Approach 1:
The sensing circuit board is designed with flexible properties, allowing it to deform and absorb assembly pressure rather than transmitting it rigidly to the display panel. This flexibility prevents pressure-induced stains and distortions while maintaining secure mounting of the fingerprint sensor assembly.
Solution Approach 2:
The sensing circuit board incorporates curved edges instead of straight edges, enabling it to conform to the contours of the display panel and distribute pressure more evenly. This curvature design reduces localized stress concentrations that would otherwise cause display panel distortion.
2Device complexity
If the sensing circuit board extends close to the opening portion edges, then the fingerprint sensor can be compactly integrated, but adhesive may contaminate the display panel during assembly
Solution Approach 1:
The sensing circuit board features curved edges that follow the contour of the opening portion, maintaining close integration for compact design while creating a natural barrier that prevents adhesive from reaching the display panel surface during assembly.
Solution Approach 2:
The sensing circuit board is designed with different edge characteristics - curved edges near the opening portion to prevent adhesive contamination, and straight edges in other areas for compact integration. This localized differentiation resolves the contradiction between compactness and contamination prevention.
3Ease of manufacture
If the sensing circuit board has straight edges, then manufacturing is simpler, but the board cannot conform to the display panel contours causing poor assembly fit
Solution Approach 1:
The sensing circuit board incorporates curved edges that conform to the display panel contours, improving assembly fit and reducing gaps. While this adds some manufacturing complexity, it ensures precise alignment and better overall assembly quality.
Solution Approach 2:
The sensing circuit board is designed with flexible properties that allow it to dynamically adapt to the display panel surface during assembly, achieving precise fit without requiring complex rigid edge geometries.
Data Source
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AI summary
A display apparatus includes a display panel including a first surface and a second surface that is opposite the first surface, a cover panel in which an opening portion overlapping the second surface of the display panel, the cover panel including a first cover surface facing the second surface of the display panel and a second cover surface opposite the first cover surface, a fingerprint sensor assembly including a sensing circuit board electrically connected to a fingerprint sensor in the opening, extending from a side of the opening portion to the second cover surface of the cover panel, and including a first edge and a second edge that are opposite each other, and an adhesive pattern located between the cover panel and the sensing circuit board, and having a width equal to or less than a distance between the first edge and the second edge.