Display Panel Optical Fingerprint Region Protection Layer Design
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Solution Overview
Problem
The integration of under-screen optical fingerprint recognition technology into display panels often compromises the product quality due to the arrangement of small holes in the light-blocking layer, which affects the integrity of functional layers above it.
Innovation Solution
A display panel design incorporating a light-blocking layer with through holes for pinhole imaging, where a protection layer fills the holes without disrupting light transmission, ensuring the continuity of functional layers and improving product quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If through holes are arranged in the light-blocking layer for pinhole imaging, then optical fingerprint recognition is enabled, but the integrity of functional layers above the light-blocking layer is compromised
Solution Approach 1:
A protection layer is introduced as an intermediary component between the light-blocking layer and the functional layers above it. This protection layer includes filling parts that fill the through holes from the side, preventing cathode material from entering the through holes while maintaining light transmission. The filling parts act as mediators that protect the integrity of functional layers without compromising the optical fingerprint recognition function.
2Illumination intensity
If through holes are formed in the light-blocking layer, then light transmission for fingerprint sensing is improved, but structural integrity and product quality deteriorate
Solution Approach 1:
The protection layer is applied locally at the through hole regions rather than uniformly across the entire display panel. The filling parts are specifically positioned to fill only the through holes in the light-blocking layer, providing localized protection where needed while maintaining overall product quality and structural integrity.
3Stability of the object's composition
If the protection layer fills the through holes completely, then structural integrity is improved, but light transmission may be blocked
Solution Approach 1:
The protection layer is segmented into different functional parts: filling parts that fill the through holes from the side to prevent cathode material intrusion, and light-transmitting parts that allow light to pass through. This segmentation enables the protection layer to simultaneously provide structural protection and maintain optical transmission functionality.
Solution Approach 2:
Instead of filling the through holes from the top (which would block light), the filling parts fill the through holes from the side walls. This inverted filling approach prevents cathode material from entering the through holes while leaving the central light transmission path open, thus maintaining both structural integrity and light transmission.
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 design enhances the recognition effect of optical fingerprint sensors by maintaining the integrity of functional layers and improving the overall quality of the display panel, preventing issues like cathode disconnection and enhancing light transmission.
Implementation Method 1
the pinhole imaging principle is usually used to guide light to the optical fingerprint sensor
Implementation Method 2
the protection layer further includes a light-transmitting part, the filling part is located between the light-transmitting part and the side wall of the through hole
Data Source
AI summary
A display panel. The display panel includes an optical fingerprint region which is provided with a light-blocking layer and a protection layer, and the light-blocking layer is provided with a plurality of through holes; the protection layer includes a filling part; the filling part fills parts of regions in the through holes, the filling part is disposed surrounding and closely fitting side walls of the through holes, and the protection layer further includes a light-transmitting part, a height of the light-transmitting part is greater than or equal to depths of the through holes, and an included angle formed between a bottom wall of the filling part and a side wall of the light-transmitting part is an acute angle; or, the filling part fills a whole region in the through hole, and a material of the filling part is a light-transmitting material.