Oblique Through Hole Fingerprint Module Size Reduction
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Solution Overview
Problem
The size of optical fingerprint sensing modules in electronic devices, such as mobile phones, cannot be reduced due to the need for a sufficient distance between light sources to avoid low-quality fingerprint images caused by over-exposure at the image boundary.
Innovation Solution
The implementation of a supporting frame with oblique through holes between the display panel and the fingerprint sensing module allows for closer placement of light sources while maintaining sufficient distance between the lens and light source openings to prevent over-exposure, enabling a smaller size fingerprint sensing module.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If light sources are placed close to each other to reduce module size, then the fingerprint sensing module size is reduced, but image over-exposure occurs at the image boundary
Solution Approach 1:
The patent introduces a supporting frame with oblique through holes that redirects light paths from a vertical arrangement to an angled arrangement. This dimensional change in light propagation allows light sources to be positioned closer together while maintaining adequate optical separation, effectively resolving the contradiction between compact size and preventing over-exposure
Solution Approach 2:
The supporting frame acts as an intermediary structure between the light sources and the display panel. Its oblique through holes serve as intermediate light guides that redirect illumination at specific angles, enabling close placement of light sources while preventing direct overhead exposure that causes image boundary over-exposure
2Object-affected harmful factors
If light sources are placed far apart to avoid image over-exposure, then image quality is maintained, but the fingerprint sensing module size increases
Solution Approach 1:
By changing the light propagation dimension from vertical to oblique through the supporting frame, the patent achieves effective optical separation without requiring large physical distances between light sources, thus maintaining image quality while reducing module size
Solution Approach 2:
The patent changes the illumination angle parameter by using oblique through holes instead of vertical light paths. This parameter change allows light sources to be positioned closer together while maintaining the effective separation needed to prevent image over-exposure, thereby reducing module size without sacrificing image quality
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 configuration allows for a smaller fingerprint sensing module with improved image quality by guiding illuminating light effectively through the oblique holes, ensuring the light sources are closer to each other without causing image over-exposure.
Implementation Method 1
The illuminating light is guided toward a sensing object above the display panel through the oblique through hole
Implementation Method 2
The lens for concentrating lights is diffused by a sensing object positioned above the display panel
Data Source
AI summary
An electronic device with fingerprint sensing function including a display panel, a fingerprint sensing module and a supporting frame are provided. The fingerprint sensing module includes a light source and an image sensor. The light source is configured to emit an illuminating light. The supporting frame is disposed between the display panel and the fingerprint sensing module for supporting the display panel. The supporting frame includes a first plane facing the display panel, a second plane facing the fingerprint sensing module, and an oblique through hole between the first plane and the second plane. The illuminating light is guided toward a sensing object above the display panel through the oblique through hole.