Fingerprint Module Stacked in Display Area for High Screen-to-Body Ratio
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Solution Overview
Problem
Existing fingerprint recognition technologies in electronic devices face challenges in maximizing the screen-to-body ratio due to the placement of fingerprint modules in non-display areas, which reduces the display area and affects the normal display effect.
Innovation Solution
The fingerprint module is integrated into the display area of the screen and stacked with it, using a frame adhesive and sealing adhesives to secure the module in place, while also forming a light transmission region with through holes in the light shielding layer to reduce thickness and enhance assembly efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the fingerprint recognition module is disposed in the non-display area, then the fingerprint recognition function is achieved, but the screen-to-body ratio decreases and the display area is reduced
Solution Approach 1:
The fingerprint module is moved from the traditional lateral placement in the non-display area to a stacked arrangement within the display area. By utilizing the vertical dimension (z-axis) through multi-layer stacking of the fingerprint module with the display layers, the patent achieves fingerprint recognition functionality while maintaining the display area, thus resolving the contradiction between functional integration and display area preservation
2Area of stationary object
If the fingerprint module is disposed in the display area, then the screen-to-body ratio increases, but the bonding stability and moisture sealing become challenging
Solution Approach 1:
The bonding structure is segmented into multiple functional adhesive layers: frame adhesive for structural bonding, first sealing adhesive for moisture sealing at the side surface, and second sealing adhesive for additional sealing at the periphery. This segmentation allows each adhesive layer to perform its specific function optimally, ensuring both bonding stability and moisture sealing while maintaining the increased display area
Solution Approach 2:
The patent uses multiple thin adhesive films (frame adhesive, first sealing adhesive, second sealing adhesive) that provide flexible bonding and sealing solutions. These thin film structures enable effective moisture sealing and stable bonding in the stacked display area configuration without adding significant thickness, thus maintaining reliability while achieving higher screen-to-body ratio
3Area of stationary object
If the fingerprint module is stacked with the screen in the display area, then the screen-to-body ratio increases, but the assembly complexity increases
Solution Approach 1:
The patent merges multiple functions into integrated adhesive components that simultaneously provide bonding, sealing, and positioning functions. The frame adhesive and sealing adhesives are designed as integrated structures that perform multiple roles in the stacked arrangement, simplifying the overall assembly process while achieving the increased display area configuration
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 increases the screen-to-body ratio by integrating the fingerprint module into the display area, ensures stable bonding and moisture protection, and reduces the overall thickness of the device, thereby enhancing both functionality and aesthetics.
Implementation Method 1
The frame adhesive includes a first connection area and a second connection area that are connected, where the second connection area is located on a periphery of the first connection area, the first connection is bonded to the first surface
Implementation Method 2
a gap is disposed between an edge of the frame adhesive and an inner wall of the through hole
Data Source
Figure 1
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AI summary
The present invention provides a structural component, including a screen and a fingerprint module, where an inner surface of the screen is a light shielding layer. The light shielding layer includes a light transmission region located in a display area of the screen, and the fingerprint module is attached to the light transmission region by using a frame adhesive. The fingerprint module includes a first surface facing the screen, a second surface away from the screen, and a side surface connected between the first surface and the second surface. The frame adhesive includes a first connection area and a second connection area that are connected, where the second connection area is located on a periphery of the first connection area, the first connection area and the second connection area are bonded to the first surface, and the second connection area is fastened to the side surface by using a first sealing adhesive. The present invention further provides and a method for assembling an electronic apparatus a fingerprint module. By using the structural component provided in the present invention, a display area of an electronic apparatus can be increased, and a screen-to-body ratio can be increased.