Pinhole Imaging Display for Fingerprint Recognition
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Solution Overview
Problem
Existing display devices based on optical technologies for fingerprint recognition suffer from low precision due to issues with uneven brightness and distortion at edge positions, leading to imprecise image detection.
Innovation Solution
A display apparatus utilizing a light-shielding layer with light-transmitting pinholes, where the imaging areas corresponding to each pinhole cover and exceed the sensing areas, preventing crosstalk and improving image uniformity and precision through pinhole imaging principles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a light-sensitive sensor is used to detect reflected light for fingerprint recognition, then fingerprint recognition function is achieved, but image uniformity and precision are insufficient due to uneven brightness and distortion at edge positions
Solution Approach 1:
The patent divides the sensing area into multiple independent sensing units, each corresponding to a specific pinhole. This segmentation allows independent optimization of each sensing unit's characteristics, enabling precise control over light collection and image formation for each region, thereby improving overall image uniformity and recognition precision
Solution Approach 2:
The patent implements different sensing area sizes for different pinholes based on their positional characteristics. Pinholes at different locations have differently sized sensing areas to compensate for edge distortion and brightness non-uniformity, ensuring consistent image quality across the entire fingerprint recognition area
2Area of stationary object
If adjacent pinholes share overlapping sensing areas, then detection coverage is improved, but crosstalk occurs between adjacent sensing areas reducing recognition accuracy
Solution Approach 1:
The patent extracts and removes the harmful crosstalk effect by designing non-overlapping sensing areas for adjacent pinholes. By eliminating the overlapping region that causes crosstalk, the system maintains clear separation between adjacent sensing units while still achieving comprehensive coverage through proper arrangement of multiple pinholes and their corresponding sensing areas
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 enhances fingerprint recognition precision by attenuating uneven brightness and distortion issues, ensuring accurate image detection and reducing crosstalk between adjacent sensing areas.
Implementation Method 1
display apparatus configured to realize fingerprint recognition based on the principle of pinhole imaging
Implementation Method 2
The fingerprint detection is realized by utilizing the properties that the semiconductor elements generate leakage current when exposed to light
Data Source
AI summary
A display apparatus is provided. The display apparatus includes a cover layer having a first surface and an opposing second surface along a first direction, and the first surface is a touch-control operation surface of the display apparatus. The display apparatus further includes a light-shielding layer including a plurality of light-transmitting pinholes, and a light-sensitive sensor layer. The light-transmitting pinholes include first and second light-transmitting pinholes adjacent to each other. An imaging area on the light-sensitive sensor layer corresponding to the first light-transmitting pinhole is a first imaging area. Sensing areas on the light-sensitive sensor layer for detecting images corresponding to the first and the second light-transmitting pinholes are a first and a second sensing areas, respectively. The first imaging area covers and exceeds the first sensing area, and the first imaging area is non- overlapped with the second sensing area.