In-Display Fingerprint Recognition via Backlight Integration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional fingerprint recognition technologies face challenges in miniaturization and integration into display devices, particularly for full-screen applications, due to bulky equipment and directional light requirements, limiting their compatibility with borderless screens and portable electronic devices.
Innovation Solution
A fingerprint recognition device with point light sources and light sensors on a substrate, where the light sources emit light that is reflected and processed by sensors to generate fingerprint information, integrated into the display layer, allowing for high-definition imaging and in-display fingerprint recognition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional fingerprint recognition equipment is used, then fingerprint recognition function is achieved, but device size becomes bulky and integration into display devices is difficult
Solution Approach 1:
The patent combines the fingerprint recognition device with the display device by integrating the light source and light sensor directly into the display structure. The light source is positioned at the backlight unit and the light sensor is integrated into the display panel, allowing the fingerprint recognition function to be merged with the display function, thereby reducing overall device size and enabling full-screen integration.
Solution Approach 2:
The display device is designed to perform multiple functions: display output and fingerprint recognition. The light source serves both as a backlight for the display and as an illumination source for fingerprint recognition. The light sensor serves both as a display component and as a fingerprint detection element, enabling the device to be versatile and adaptable to different functions within a single integrated structure.
2Measurement precision
If directional light requirements are imposed on fingerprint recognition, then recognition accuracy is improved, but compatibility with borderless screens is reduced
Solution Approach 1:
The patent transitions from conventional side-illuminated fingerprint recognition to a configuration where the light source is positioned at the backlight unit (below the display panel) and light travels through the display panel to illuminate the fingerprint. This dimensional change allows light to approach the fingerprint from multiple angles through the transparent display panel, maintaining recognition accuracy while enabling full-screen and borderless screen compatibility.
3Reliability
If bulky equipment is used for fingerprint recognition, then recognition reliability is maintained, but miniaturization is limited
Solution Approach 1:
The fingerprint recognition components (light source and light sensor) are nested within the existing display device structure. The light source is integrated into the backlight unit and the light sensor is embedded in the display panel, allowing the fingerprint recognition system to be nested within the display device without requiring separate bulky equipment, thereby maintaining reliability while achieving miniaturization.
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
Enables miniaturization, improved integrability, and high-definition fingerprint imaging, reducing manufacturing costs while enhancing the compatibility of fingerprint recognition with display devices, particularly for full-screen applications.
Implementation Method 1
a plurality of light sensors on the substrate, which are configured to generate an electrical signal based on the light emitted from the plurality of point light sources and reflected from a touch surface
Data Source
AI summary
The present disclosure generally relates to the field of display technology, and in particular to a fingerprint recognition device and a display device having the fingerprint recognition device. A fingerprint recognition device includes a substrate; a plurality of point light sources on the substrate, which are configured to emit light; a plurality of light sensors on the substrate, which are configured to generate an electrical signal based on the light emitted from the plurality of point light sources and reflected from a touch surface, and a display layer on the plurality of light sensors.