Biometric Imaging Device with Adaptive Collimator Layer
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Solution Overview
Problem
Current biometric imaging devices integrated into display panels face challenges due to non-transparent circuitry and varying light transmission properties, which affect the ability to capture high-resolution fingerprint images effectively.
Innovation Solution
A biometric imaging device with a partially transparent display panel and a collimator layer featuring different-sized collimating structures aligned according to the display unit cell's transmission pattern, optimizing light sensitivity and resolution by adapting collimator properties based on imaging conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a display panel with circuitry is used, then the device can be integrated into a portable electronic device, but the display panel is not fully transparent and light transmission varies
Solution Approach 1:
The collimator layer is designed with spatially varying properties - different collimator opening sizes are used in different regions corresponding to different display unit cell types. This local adaptation allows each region to be optimized for its specific transmission characteristics, compensating for the non-uniform transparency of the display panel while maintaining overall integration capability.
2Measurement precision
If collimators are used to focus light, then image quality improves, but manufacturing complexity increases due to alignment requirements
Solution Approach 1:
The collimator layer is designed and manufactured as a separate component with pre-defined collimator openings that correspond to the display unit cell pattern. This preliminary preparation allows for precise alignment to be built into the design stage, and the layer can be attached as a complete unit rather than requiring complex alignment during assembly.
Solution Approach 2:
The collimator layer acts as an intermediary component between the display panel and the image sensor. It provides a standardized interface that simplifies the overall system integration while maintaining the optical focusing function needed for high-quality imaging.
3Ease of manufacture
If uniform collimators are used, then manufacturing is simpler, but image quality deteriorates due to varying transmission properties
Solution Approach 1:
Different collimator opening sizes are used in different regions corresponding to different display unit cell types. This local adaptation allows each region to be optimized for its specific transmission characteristics, compensating for the non-uniform transparency of the display panel while maintaining overall integration capability.
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 enables the capture of high-resolution fingerprint images by maximizing light transmission and sensitivity, allowing for effective biometric identification and verification across various display panel types and conditions.
Implementation Method 1
a collimator layer arranged between the display panel and the image sensor, the collimator layer comprising a plurality of first collimating structures having a first collimator opening size and a plurality of second collimating structures having a second collimator opening size
Implementation Method 2
light emitted by light emitting elements of the display panel will be emitted through a cover layer of the display panel and reflected by an object, such as a finger, in contact with the outer surface. The reflected light will in turn propagate through the display panel
Implementation Method 3
an image sensor comprising a photodetector pixel array arranged underneath the display panel
Data Source
AI summary
A biometric imaging device configured to capture an image of an object in contact with an outer surface of the imaging device, comprising: an at least partially transparent display panel comprising a repeating transmission pattern defined by an array of display unit cells, each display unit cell having the same transmission pattern; an image sensor comprising a photodetector pixel array arranged underneath the display panel; and a collimator layer arranged between the display panel and the image sensor that comprises a plurality of first collimating structures having a first collimator opening size and a plurality of second collimating structures having a second collimator opening size different from the first collimator opening size, wherein the respective collimator opening size and relative location of the first and second collimating structure in relation to the display unit cell is based on the transmission pattern of the display unit cell.