Biometric Recognition Module with Angled Channels for Dry-Finger Sensing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The miniaturization of biometric information recognition modules, such as fingerprint sensors, in electronic devices is hindered by the need to maintain accuracy and collection area within a small space, leading to challenges in reducing the structural size and improving recognition on dry fingers.
Innovation Solution
A biometric information recognition module with an optical path guiding layer and photosensitive pixel array, featuring optical channels with included angles, expands the biometric information collection area without increasing the physical size, allowing more light beams to be incident on the photosensitive pixel array.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the optical detector is reduced in volume to meet miniaturization demands, then the structural size of the fingerprint recognition module is reduced, but the biometric information collection area cannot be ensured
Solution Approach 1:
The patent introduces optical channels with inclined angles (not perpendicular to the display screen) to guide reflected light from a larger area onto the photosensitive pixel array. This angular dimensionality change allows the collection area to exceed the physical area of the photosensitive array, resolving the contradiction between small detector size and large collection area requirement
Solution Approach 2:
The patent introduces an optical path guiding layer with optical channels as an intermediary between the display screen and the photosensitive pixel array. This intermediary structure guides light beams from a larger area through inclined optical channels onto the smaller photosensitive array, enabling area expansion without increasing detector size
2Area of stationary object
If the optical channels are arranged perpendicular to the photosensitive pixel array, then the structure is simple, but the collection area is limited to a small range
Solution Approach 1:
The patent applies different optical channel configurations to different regions: central region channels have one angle configuration while peripheral region channels have different angle configurations. This local differentiation optimizes light collection from various areas of the display screen, expanding the overall collection area while maintaining manageable structural complexity
Solution Approach 2:
The optical path guiding layer is divided into multiple regions (central region and peripheral regions) with different optical channel arrangements. This segmentation allows each region to be optimized independently for its specific light collection function, achieving comprehensive area coverage
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 recognition accuracy and efficiency on dry fingers by receiving more optical signals, reduces the photosensitive pixel array volume, and optimizes internal space utilization in electronic devices.
Implementation Method 1
a function of recording fingerprints or recognizing specific fingerprints is achieved by irradiating the fingerprints by a light source of a display panel, reflecting the light, and receiving, recording or analyzing by an optical detector fingerprint-reflected light carrying specific biometric information
Implementation Method 2
the optical channels in the at least one peripheral region have included angles with a first straight line perpendicular to a surface of the photosensitive pixel array
Implementation Method 3
light beams carrying biometric information each pass through the optical channels and then are incident on the corresponding photosensitive pixel units
Data Source
AI summary
A biometric information recognition module and an electronic device are provided, including an optical path guiding layer and a photosensitive pixel array which are arranged in sequence. The optical path guiding layer includes a plurality of optical channels. The photosensitive pixel array includes a plurality of photosensitive pixel units, and light beams carrying biometric information pass through optical channel(s) and are then incident on corresponding photosensitive pixel unit(s), the light path guiding layer including a central region and peripheral region(s) surrounding the central region, and an included angle being formed between an optical channel in the peripheral region and a first straight line perpendicular to the surface of the photosensitive pixel array.