Optical Fingerprint Display Structure for Pressure-Resistant Sensor Support
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Solution Overview
Problem
Existing display screens with integrated fingerprint sensors face deformation and damage due to pressure, especially when using flexible materials, leading to reliability issues during fingerprint identification.
Innovation Solution
A display screen design where the optical fingerprint sensor is positioned beneath a transparent body filling a through-hole in the middle frame, providing support and protection while allowing light transmission for identification without holes in the display screen.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a flexible material is used as packaging for the display panel surface, then the display screen can be made more flexible and adaptable, but the display panel will deform under pressure causing collapse and damage to the fingerprint sensor
Solution Approach 1:
The display screen structure is segmented into multiple functional layers: the flexible display panel, the rigid middle frame, and the rigid transparent body. This segmentation allows the flexible material to provide adaptability while the rigid components protect the fingerprint sensor from deformation, resolving the contradiction between flexibility and sensor integrity.
Solution Approach 2:
The rigid transparent body acts as an intermediary protective layer between the flexible display panel and the fingerprint sensor. This intermediary structure transfers the mechanical stress away from the sensor, allowing the flexible material to maintain its adaptability while preventing sensor damage.
2Reliability
If a rigid protective structure is added to protect the fingerprint sensor, then the sensor reliability is improved, but the display screen complexity increases
Solution Approach 1:
The rigid transparent body serves multiple functions simultaneously: it protects the fingerprint sensor from mechanical damage, maintains structural rigidity to prevent deformation, and allows light transmission for optical fingerprint identification. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in structural complexity.
Solution Approach 2:
The protective function and the light transmission function are merged into a single component - the rigid transparent body. By combining these functions into one element rather than using separate protective cover and transparent window, the overall device complexity is minimized while still achieving reliable sensor protection.
3Ease of operation
If a hole is provided in the display screen for the fingerprint sensor, then the sensor can be accessed for identification, but the display integrity and appearance are compromised
Solution Approach 1:
The fingerprint sensor is extracted from the display screen surface and positioned beneath the rigid transparent body in the middle frame. This extraction allows the sensor to be accessible for identification operations while maintaining the continuous, hole-free integrity of the display screen surface, resolving the contradiction between operational accessibility and display integrity.
Solution Approach 2:
The fingerprint sensor is relocated from the two-dimensional display surface to the three-dimensional space beneath the transparent body. This dimensional transition allows the sensor to remain accessible for finger contact while preserving the complete, hole-free appearance of the display screen surface.
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
Ensures reliable optical fingerprint identification under the screen by preventing deformation and protecting the sensor, maintaining display integrity and reliability without compromising the display's appearance.
Implementation Method 1
the optical fingerprint sensor can get the incoming light passed through the display panel and transparent body
Data Source
Figure 1~2
Figure 3
AI summary
A display screen and an electronic equipment are provided. The display screen comprises a middle frame (101), a display panel (100) and an optical fingerprint sensor (104). The display panel (100) is superimposed on the upper surface (101a) of the middle frame (101), and the through-hole (102) provided on the middle frame (101) and extending through the upper and lower surfaces (101a, 101b) of the middle frame (101) is filled with a transparent body (103), the optical fingerprint sensor (104) is disposed beneath the transparent body (103).