Display Panel Full-Screen Fingerprint Recognition via Light Shielding
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Solution Overview
Problem
OLED display panels with integrated fingerprint recognition modules face challenges in slow and inconvenient unlocking due to the fixed position of the recognition module and the risk of screen burn-in from frequent light emission, which affects user experience and device security.
Innovation Solution
A display panel design featuring a substrate with a driving circuit layer, a light emitting layer comprising anti-peeping and display sub-pixels, and a light shielding layer with light transmitting and shielding areas, allowing for full-screen fingerprint recognition and reducing the risk of image retention through strategic light management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the fingerprint recognition module is arranged under the screen at a fixed position, then the module can be integrated into the display panel, but the unlocking speed becomes slow and inconvenient due to the need for accurate finger pressing
Solution Approach 1:
The fingerprint recognition function is segmented from a fixed-position module and distributed across multiple photosensitive devices positioned at different locations on the display panel, enabling flexible finger placement while maintaining integration
Solution Approach 2:
The fingerprint recognition capability is extended from a single fixed position to multiple positions across the display surface, adding spatial dimensionality to the recognition function and eliminating the need for precise finger placement
2Productivity
If the organic light-emitting diode on the fingerprint recognition module is frequently turned on for recognition, then fingerprint recognition can be performed, but the risk of screen burn-in increases
Solution Approach 1:
The fingerprint recognition function is divided into multiple independent photosensitive devices distributed across the display panel, allowing the recognition task to be shared among multiple components rather than relying on a single frequently activated module
Solution Approach 2:
Multiple photosensitive devices that can serve both as display elements and fingerprint sensing elements, enabling the display panel itself to perform dual functions and eliminating the need for a dedicated, frequently activated fingerprint module
3Illumination intensity
If light is emitted by the organic light-emitting diode for fingerprint recognition, then the fingerprint can be illuminated, but the light may cause image retention on the display panel
Solution Approach 1:
The light shielding capability is applied locally and selectively - the light shielding layer blocks light in fingerprint recognition areas while allowing light transmission in display areas, creating different optical properties in different regions of the display panel
Solution Approach 2:
A light shielding layer is introduced as an intermediary component between the light-emitting diode and the display panel, controlling light transmission to prevent image retention while maintaining necessary illumination for fingerprint recognition
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 speed and convenience of fingerprint recognition while minimizing the risk of screen burn-in, providing improved user experience and device security by optimizing light utilization and shielding.
Implementation Method 1
a corresponding one of the photosensitive devices is capable of receiving at least part of light reflected by a fingerprint through the light transmitting area
Implementation Method 2
a light shielding layer including a plurality of light shielding components. Each of the light shielding components includes a light transmitting area and a light shielding area located on at least one side of the light transmitting area
Data Source
AI summary
A display panel includes a substrate, a driving circuit layer, a light emitting layer and a light shielding layer. The driving circuit layer includes photosensitive devices. The light emitting layer includes a plurality of anti-peeping sub-pixels and a plurality of display sub-pixels. The light shielding layer includes a plurality of light shielding components. Each of the light shielding components includes a light transmitting area and a light shielding area located on at least one side of the light transmitting area. A corresponding one of the photosensitive devices can receive at least part of light reflected by a fingerprint through the light transmitting area. An orthographic projection of each of the anti-peeping sub-pixels on the light shielding layer is at least partially located in a corresponding one of the light shielding components.