Under-screen Fingerprint Texture Recognition via Light Shielding Collimation
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Solution Overview
Problem
Existing fingerprint recognition technologies face challenges in achieving accurate and large-area under-screen fingerprint recognition due to interference from ambient light and uneven irradiance, leading to blurred or failed texture imaging.
Innovation Solution
A texture recognition apparatus comprising a light source array, an image sensor array, and a light shielding layer with light-transmitting holes that collimate light emitted by the light sources and reflected by the texture to a direction perpendicular to the touch surface, ensuring that only signal light is received by the image sensors, thereby improving image clarity and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a light source array and image sensor array are used for under-screen fingerprint recognition, then texture recognition capability is improved, but ambient light interference causes blurred or failed texture imaging
Solution Approach 1:
A light shielding layer with light-transmitting holes is introduced as an intermediary component between the light source array and image sensor array. This layer selectively blocks ambient light while allowing signal light to pass through, thereby resolving the contradiction between maintaining texture recognition accuracy and eliminating ambient light interference
Solution Approach 2:
The light shielding layer is designed with localized light-transmitting holes at specific positions corresponding to the light sources and image sensors. This local quality approach allows the shielding layer to block harmful ambient light in most areas while permitting necessary signal light transmission through the holes, thus improving texture recognition accuracy without being completely blocked by ambient light
2Illumination intensity
If light is allowed to reach the image sensors from multiple directions, then more light is captured, but uneven irradiance leads to blurred texture images
Solution Approach 1:
The light-transmitting holes in the light shielding layer are positioned and sized to allow light from specific directions (from the light sources) to reach the image sensors while blocking light from other directions. This creates non-uniform local transmission properties that ensure even irradiance and clear texture images
Solution Approach 2:
The light shielding layer acts as an intermediary that controls the directionality of light reaching the image sensors. By selectively transmitting light from the light sources while blocking ambient light from other directions, it ensures uniform illumination and prevents blurred images
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
The solution enables clearer and more accurate texture recognition by filtering out ambient light and ensuring precise correspondence of light to texture features, enhancing the reliability of large-area fingerprint recognition.
Implementation Method 1
the plurality of light-transmitting holes are configured to collimate light emitted by the plurality of light sources and reflected by the texture to a direction perpendicular to the touch side surface
Implementation Method 2
each of the plurality of image sensors comprises a photosensitive element; the plurality of image sensors are configured to be able to receive light emitted from the plurality of light sources and reflected by a texture
Data Source
AI summary
A texture recognition apparatus and an electronic apparatus are provided. The texture recognition apparatus has a touch side surface, and includes a light source array, an image sensor array, and a light shielding layer. The light source array includes a plurality of light sources; the image sensor array includes a plurality of image sensors, each image sensor includes a photosensitive element; the light shielding layer is on a light incident side of the image sensor array, the light shielding layer includes a plurality of light-transmitting holes; the plurality of light-transmitting holes are configured to collimate light emitted by the plurality of light sources and reflected by the texture to a direction perpendicular to the touch side surface; and in the direction perpendicular to the touch side surface, a photosensitive element in each image sensor at least partially overlaps with at least one of the plurality of light-transmitting holes.