Array Substrate Light-Shielding Layer Overlap for Optical Fingerprint Integration
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Solution Overview
Problem
Integrating optical fingerprint identification into LCD screens is challenging due to restrictions such as backlight and aperture ratio, which reduces the accuracy of fingerprint identification.
Innovation Solution
An array substrate is designed with a light-sensitive component layer and a first light-shielding layer, where the black matrix layer overlaps with the light-sensitive components, and collimating holes are used to improve integration and reduce optical noise interference, enhancing fingerprint identification sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If optical fingerprint identification is integrated into LCD screens, then fingerprint identification function is achieved, but optical noise interference increases and identification accuracy decreases
Solution Approach 1:
The patent converts the harmful backlight of LCD screens into a beneficial light source for optical fingerprint identification. By utilizing the existing backlight to illuminate the fingerprint sensor, the system eliminates the need for separate lighting structures while achieving effective fingerprint capture, thus transforming the LCD's inherent disadvantage into an advantage for integrated optical fingerprint recognition
2Adaptability or versatility
If black matrix layer overlaps with light-sensitive components, then integration is improved and optical noise is reduced, but manufacturing complexity increases
Solution Approach 1:
The black matrix layer serves dual functions: it acts as a light-shielding structure to block unwanted light from reaching light-sensitive components, and simultaneously serves as the fingerprint sensor's light-receiving surface. This multi-functionality reduces the need for separate components and simplifies the overall structure despite the overlapping arrangement
Solution Approach 2:
The patent merges the black matrix layer with the light-sensitive component layer by making them overlap, combining two previously separate functional elements into an integrated structure. This merging reduces the number of discrete components and simplifies the overall device architecture while achieving both light shielding and fingerprint sensing functions
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 improves the integration of fingerprint identification regions and reduces optical noise interference, thereby increasing the sensitivity and accuracy of fingerprint identification on LCD screens.
Implementation Method 1
Optical fingerprint identification technology utilizes a principle of refraction and reflection of light
Implementation Method 2
Optical fingerprint identification technology utilizes a principle of refraction and reflection of light
Implementation Method 3
a first light-shielding layer disposed on the light-sensitive component layer, wherein an orthographic projection of the first light-shielding layer on the base substrate partially overlaps with an orthographic projection of each of the light-sensitive components on the base substrate
Data Source
AI summary
An array substrate, a display panel, and a display device are provided by the present application. The array substrate includes a base substrate; a light-sensitive component layer disposed on the base substrate, wherein a plurality of light-sensitive components are disposed at intervals in the light-sensitive component layer; and a first light-shielding layer disposed on the light-sensitive component layer. An orthographic projection of the first light-shielding layer on the base substrate partially overlaps with an orthographic projection of each of the light-sensitive components on the array substrate.