Optical Pattern Layer for Fingerprint Sensor Light Control
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Solution Overview
Problem
Current display devices with fingerprint recognition functions face challenges in achieving high sensitivity due to interference from light angles and inefficient light transmission, which affects the accuracy of fingerprint detection.
Innovation Solution
The implementation of an optical pattern layer with specific transmission and light blocking portions on the sensor, optimized for light incidence angles and material matching, enhances the sensitivity of fingerprint recognition by controlling light passage and reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an optical pattern layer with light blocking portions is added to control light angles, then light transmission efficiency is improved, but device structure complexity increases
Solution Approach 1:
An optical pattern layer is introduced as an intermediary component between the display panel and the sensor. This layer contains light blocking portions that selectively block oblique light while allowing perpendicular light to pass through, thereby improving fingerprint recognition sensitivity without requiring fundamental changes to the existing sensor or display panel structures.
Solution Approach 2:
The optical pattern layer is segmented into multiple light blocking portions arranged in a specific pattern. Each light blocking portion acts as an independent element that blocks light from specific angles, collectively achieving the function of filtering oblique light while maintaining transparency for perpendicular light.
2Measurement precision
If the minimum distance between detection electrode and light blocking portion is reduced to 1-5 micrometers, then light transmission is enhanced, but manufacturing precision requirements increase
Solution Approach 1:
The patent specifies a precise distance parameter range of 1-5 micrometers between the detection electrode and the light blocking portion. This parameter optimization balances light transmission efficiency (requiring smaller distances) with manufacturing feasibility (requiring larger distances), achieving the best fingerprint detection accuracy within practical manufacturing capabilities.
3Object-affected harmful factors
If light blocking portions are designed with specific height-to-width ratios, then light angle control is improved, but device complexity increases
Solution Approach 1:
The light blocking portions are designed with specific local geometric properties, where the height is controlled to be between 1/tan(AG) times and 5 times the width. This local quality control ensures that each light blocking portion effectively blocks light from specific angles while maintaining overall optical performance.
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 improves the accuracy and sensitivity of fingerprint recognition by limiting light incidence angles and enhancing light transmission, allowing for more precise detection of biometric information.
Implementation Method 1
An optical pattern layer is disposed on the sensor and includes a plurality of transmission portions and a light blocking portion
Implementation Method 2
an optical pattern layer with specific transmission and light blocking portions on the sensor, optimized for light incidence angles and material matching, enhances the sensitivity of fingerprint recognition by controlling light passage and reducing interference
Data Source
AI summary
A display device includes a sensor having a detection electrode. An optical pattern layer is disposed directly on the sensor and includes a plurality of transmission portions and a light blocking portion. A display panel is disposed on the optical pattern layer. A minimum distance between the detection electrode and the light blocking portion is in a range of 1 micrometer-5 micrometers.