Middle Frame Grooves for Under-Screen Fingerprint Light Sources
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Solution Overview
Problem
The existing design of electronic devices with under-screen fingerprint recognition circuits reduces the screen-to-body ratio due to the need for a larger gap between the display and the middle frame to accommodate the light source, limiting the display size and efficiency of fingerprint recognition.
Innovation Solution
A middle frame with a supporting frame and grooves for the light source of the under-screen fingerprint recognition circuit, allowing the light source to be integrated into the frame and reducing the gap between the display and the middle frame, thereby increasing the screen-to-body ratio while maintaining accurate fingerprint recognition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the light source is placed outside the display area to enable under-screen fingerprint recognition, then fingerprint recognition function is achieved, but the gap between display and middle frame increases reducing screen-to-body ratio
Solution Approach 1:
The light source is nested within the middle frame structure by creating a groove in the inner sidewall. This allows the light source to be positioned within the existing frame boundaries rather than requiring external space, thereby maintaining the screen-to-body ratio while enabling fingerprint recognition functionality.
Solution Approach 2:
Instead of placing the light source in the lateral gap between display and frame (2D plane constraint), the solution moves the light source into the vertical dimension by creating a groove in the inner sidewall. This dimensional transition allows the light source to occupy space within the frame's thickness rather than requiring additional lateral space.
2Area of stationary object
If the gap between display and middle frame is reduced to increase screen-to-body ratio, then display area increases, but space for light source accommodation decreases
Solution Approach 1:
The middle frame's inner sidewall is modified with a localized groove structure at the specific position where the light source needs to be placed. This local structural change provides the necessary accommodation space for the light source without requiring a uniform increase in the overall gap between display and frame, thus preserving maximum display area.
3Adaptability or versatility
If the middle frame size is increased to accommodate light source, then fingerprint recognition is enabled, but the overall device size increases
Solution Approach 1:
The middle frame is segmented with a groove feature in the inner sidewall, creating a dedicated space for the light source within the existing frame boundaries. This segmentation allows the light source to be integrated into the frame structure without requiring an overall increase in frame dimensions.
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 design enhances the screen-to-body ratio by allowing a larger display area without altering the middle frame size and improves fingerprint recognition accuracy with symmetrically arranged grooves for multiple light sources.
Implementation Method 1
The under-screen fingerprint recognition circuit includes a light source and a receiver. Light emitted by the light source is reflected onto the receiver when a user's finger touches a corresponding area on a screen.
Implementation Method 2
Light emitted by the light source is reflected onto the receiver when a user's finger touches a corresponding area on a screen.
Data Source
AI summary
An electronic device and a middle frame thereof are provided. The middle frame includes a supporting frame. The supporting frame is provided with a supporting surface configured to support an edge area of a transparent cover plate of the electronic device, and an inner sidewall connected to the supporting surface. A groove for receiving a light source of an under-screen fingerprint recognition circuit is disposed in the inner sidewall and connected to the supporting surface.