Collimator-Based Fingerprint Sensing in Display Devices
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Solution Overview
Problem
Current display devices for fingerprint identification have a limited user interface area, leading to a poor user experience due to the small region available for fingerprint input, which restricts the effectiveness and convenience of fingerprint recognition.
Innovation Solution
A display device with a photosensitive layer and collimators that allow light signals to pass through light-passing holes, enabling the acquisition of images for fingerprint identification over a larger area of the display face, thereby enhancing user experience by allowing fingerprint input across a greater proportion of the display region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the fingerprint identification module is stacked below the display module with a small touch area, then the device structure is compact, but the user experience deteriorates due to limited fingerprint input area
Solution Approach 1:
The display module serves dual functions: it acts as both the display screen and the fingerprint sensing area. The entire display region can be used for fingerprint identification, eliminating the need for a separate dedicated fingerprint module and expanding the usable area while maintaining structural simplicity
Solution Approach 2:
The fingerprint sensing function is merged with the display module by placing photosensitive units behind the display face, allowing the display structure itself to perform both display and biometric authentication functions simultaneously
2Reliability
If light signals are allowed to pass through the display face for fingerprint recognition, then fingerprint identification capability is improved, but display quality may deteriorate due to light interference
Solution Approach 1:
The light-shielding member is positioned at specific locations (between adjacent display units) rather than covering the entire display face, allowing light to pass through the display face for fingerprint sensing while blocking light only where necessary to prevent interference between adjacent pixels
Solution Approach 2:
The light-shielding member divides the display face into separate light-shielding areas and light-transmitting areas, with light-passing holes positioned precisely to align with photosensitive units while maintaining display quality in other regions
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 solution allows for improved fingerprint identification by expanding the input area, enriching verification methods and scenarios, and providing a better user experience by enabling fingerprint recognition across a larger display area.
Implementation Method 1
the collimators defining light-passing holes aligned with the photosensitive units, wherein the light-passing holes are capable of allowing light signals to pass through to reach the photosensitive units
Implementation Method 2
a photosensitive layer including a plurality of photosensitive units... receiving imaging light signals including a target light signal, wherein the target light signal sequentially passes through the display face, the light-passing holes, and reaches the photosensitive layer
Implementation Method 3
The substrate includes a plurality of display units and a light-shielding member, the light-shielding member is disposed to space apart every two adjacent ones of the plurality of display units
Data Source
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AI summary
The present disclosure provides a display device (100) including a display face (91) and a bottom face (11) facing away from each other. Between the display face (91) and the bottom face (11), the display device (100) further includes: a substrate (60); a photosensitive layer (40) including a plurality of photosensitive units (41), the plurality of photosensitive units being disposed on the substrate (60); and a plurality of collimators (71) disposed between the photosensitive layer (40) and the display face (91), the collimators defining light-passing holes (711) aligned with the photosensitive units. The light-passing holes are capable of allowing light signals to pass through to reach the photosensitive units. The present disclosure further provides an image acquisition method.