Under-Display Fingerprint Region Light Shielding in OLED Panels
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Solution Overview
Problem
Under-display fingerprint recognition technologies face reduced efficiency due to interference from light emitted by OLED screens, leading to touch failure or inaccuracy in fingerprint recognition.
Innovation Solution
A display device with a light-shielding structure and light-transmitting holes in the fingerprint recognition region, using opaque materials like black polyimide or metal for the planarization and pixel definition layers, and retaining wall structures to block ineffective light, while allowing light from finger touches to pass through for accurate recognition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If OLED self-luminous layer is used as light source for under-display fingerprint recognition, then fingerprint recognition can be achieved, but light emitted by the screen interferes with fingerprint imaging and reduces collection efficiency
Solution Approach 1:
The display screen is divided into distinct regions: a display region with light-emitting units and a fingerprint recognition region with light-shielding structures and light-transmitting holes. This segmentation allows the light-emitting units to be spatially separated from the fingerprint recognition area, preventing light interference while maintaining display functionality. The light-shielding structures are further segmented into multiple layers (planarization layer, pixel definition layer, light-shielding layer) with through-holes positioned at specific locations to allow controlled light transmission for fingerprint recognition.
Solution Approach 2:
Different regions of the display screen are assigned different optical properties: the display region has light-emitting characteristics while the fingerprint recognition region has light-shielding characteristics with localized light-transmitting areas. The light-shielding structures are configured with specific through-hole positions and sizes to allow light transmission only at the fingerprint recognition location, creating local quality variations that enable simultaneous display and fingerprint recognition functions without mutual interference.
2Reliability
If light-shielding structures with through-holes are added to block interference light, then fingerprint recognition accuracy improves, but device thickness increases
Solution Approach 1:
The light-shielding structures are merged with existing display panel components: the planarization layer and pixel definition layer are integrated into the display manufacturing process and serve dual purposes of display fabrication and light shielding for fingerprint recognition. The light-shielding layer is combined with the through-hole structure to create a multi-functional component that provides both light blocking and light transmission capabilities within the same structural footprint, eliminating the need for separate thick shielding components.
Solution Approach 2:
The light-shielding structures are configured as thin-film layers with through-holes rather than bulk three-dimensional shielding components. By transitioning from a volumetric shielding approach to a planar thin-film approach with controlled porosity (through-holes), the solution achieves effective light shielding while maintaining minimal thickness. The through-holes are positioned in the fingerprint recognition region to allow light transmission without requiring additional thickness for separate optical paths.
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
Improves the accuracy of fingerprint recognition by blocking non-touch effective light and acting as a collimator, reducing the thickness of the display device by removing the need for a collimator component.
Implementation Method 1
a light-shielding structure, and a plurality of light-transmitting holes is disposed in the light-shielding structure in the fingerprint recognition region
Implementation Method 2
Optical under-display fingerprint recognition technology uses light refracted from a top surface of a display component of the equipment to perform fingerprint sensing
Data Source
AI summary
The present invention provides a display device. The display device includes a display region, a fingerprint recognition region disposed in the display region, and further includes a display panel. The display panel includes a light-shielding structure. A plurality of light-transmitting holes is disposed in the light-shielding structure in the fingerprint recognition region. A fingerprint recognition group is disposed under the display panel and corresponds to the fingerprint recognition region.