Collimation Layer for Expanded Fingerprint Identification Area
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Solution Overview
Problem
Current mobile devices with integrated fingerprint identification and display modules have limited areas for fingerprint recognition due to the stacking configuration, restricting user interaction and efficiency.
Innovation Solution
A display device comprising a first substrate, a photosensitive layer, a liquid crystal layer, a second substrate, and a collimation layer, where the second substrate has display units with holes and collimators that direct light signals to photosensitive units, allowing for larger surface area fingerprint identification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the fingerprint identification module is stacked below the display module, then the device structure is compact, but the area for fingerprint identification is limited
Solution Approach 1:
The patent transitions from a vertical stacking arrangement (3D layering) to a planar integration approach where the fingerprint identification module is embedded within the display module's plane. The display module includes both display units and photosensitive units arranged in the same layer, allowing the fingerprint identification area to expand across the display surface rather than being confined to a small stacked region below the display.
2Ease of operation
If the fingerprint identification module is stacked below the display module, then the device structure is compact, but user interaction area is restricted
Solution Approach 1:
The patent merges the fingerprint identification module with the display module into a single integrated structure. The display module contains both display units for visual output and photosensitive units for fingerprint sensing, allowing users to interact with the entire display surface for fingerprint identification rather than being limited to a small separate area below the display.
3Measurement precision
If collimators are added to direct light signals to photosensitive units, then fingerprint recognition accuracy is improved, but device structure becomes more complex
Solution Approach 1:
The patent divides the photosensitive layer into multiple photosensitive units that are spatially separated and individually aligned with corresponding collimators. Each collimator is positioned to direct light signals to its specific photosensitive unit, creating a segmented optical path that improves fingerprint recognition accuracy while distributing the structural complexity across multiple discrete elements rather than requiring a single complex optical system.
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
Enables fingerprint identification over a larger area, enhancing user experience by allowing more extensive interaction and improving the accuracy of fingerprint recognition.
Implementation Method 1
a light signal passes through the second hole and the corresponding one of the first holes and reaches the corresponding one photosensitive unit
Implementation Method 2
the collimation layer comprises a plurality of collimators, each of the plurality of collimators defines a second hole the second hole is communicated with a corresponding one of the first holes and faces a corresponding one of the photosensitive units
Implementation Method 3
the photosensitive layer comprises a plurality of photosensitive units... a light signal passes through the second hole and the corresponding one of the first holes and reaches the corresponding one photosensitive unit
Implementation Method 4
reflective-material is arranged on a side of each of the plurality of photosensitive units facing the first substrate
Data Source
AI summary
A display device includes a first substrate, a photosensitive layer, a liquid crystal layer, a second substrate, and a collimation layer that are stacked successively. The photosensitive layer comprises photosensitive units. The second substrate comprises display units and a shutter layer having first holes, any adjacent two of the display units are spaced by the shutter layer, and one of the first holes is located between any adjacent two different ones of the display units. The collimation layer comprises collimators, each of the collimators defines a second hole communicated with a corresponding one of the first holes and facing a corresponding one of the photosensitive units, and a light signal passes through the second hole and the corresponding one of the first holes and reaches the corresponding one photosensitive unit. Reflective-material is arranged on a side of each of the photosensitive units facing the first substrate.