Fingerprint-Sensing Display Structure With Dual Light Blocking Layers
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Solution Overview
Problem
Existing display devices face challenges in effectively authenticating user fingerprints while maintaining privacy, particularly in environments where viewing angles and ambient light conditions can compromise the security of personal information.
Innovation Solution
A display device design incorporating specific light blocking layers and light emitting parts, with controlled transmission holes and overlapping structures, to manage light reflection and sensing for enhanced fingerprint authentication and privacy control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If light blocking layers are added to reduce noise light, then fingerprint sensing accuracy is improved, but device structure becomes more complex
Solution Approach 1:
The light blocking function is segmented into multiple layers: a first light blocking layer with a first light blocking region and a second light blocking layer with a second light blocking region. Each layer serves specific purposes - the first layer blocks lateral light from light emitting parts, while the second layer blocks reflected light from reaching the light sensing part. This segmentation allows precise control of light paths to improve fingerprint sensing accuracy while maintaining manageable structural complexity through modular design.
2Object-affected harmful factors
If multiple light blocking layers are implemented, then noise light is reduced, but manufacturing process becomes more difficult
Solution Approach 1:
The first and second light blocking layers are merged into a single integrated light blocking structure that performs multiple functions simultaneously. The structure includes a first light blocking region extending in a first direction and a second light blocking region extending in a second direction perpendicular to the first direction, forming an integrated assembly that blocks both lateral light and reflected light. This merging approach reduces manufacturing steps compared to producing and assembling separate light blocking components, thereby easing the manufacturing process while effectively reducing noise light.
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 design improves fingerprint recognition accuracy and reduces noise light interference, ensuring secure fingerprint authentication with reduced viewing angles and enhanced privacy protection.
Implementation Method 1
a first light emitting part and a second light emitting part disposed on the substrate and emitting light
Implementation Method 2
The optical method may authenticate the user's fingerprint by sensing light reflected from the user's fingerprint
Implementation Method 3
photo-sensors, which sense light to authenticate the user's fingerprint by the optical method
Data Source
AI summary
A display device includes: a substrate; a first light emitting part and a second light emitting part disposed on the substrate and emitting light; a light sensing part disposed on the substrate and sensing incident light; a first light blocking layer disposed on the first light emitting part, the second light emitting part, and the light sensing part and having a first transmission hole; and a second light blocking layer disposed on the first light blocking layer and having a second transmission hole, wherein the first transmission hole, the second transmission hole, and the first light emitting part overlap each other in a direction substantially perpendicular to an upper surface of the substrate.