Collimator and Lens Assembly for Small-Sensor Fingerprint Displays
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Solution Overview
Problem
Fingerprint recognition display devices have high costs due to the large size of fingerprint recognition sensors, which are typically used in full-screen mode, necessitating a reduction in sensor size while maintaining recognition capability.
Innovation Solution
A fingerprint recognition display device design featuring a smaller fingerprint recognition sensor positioned on the non-light-emitting side of the display panel, with a collimator and lens assembly that converts reflected light rays into collimated light, allowing the formation of a fingerprint image on the sensor, enabling full-screen recognition without increasing sensor size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a full-screen fingerprint recognition sensor is used, then full-screen fingerprint recognition capability is achieved, but the sensor size and cost increase
Solution Approach 1:
The display screen is divided into multiple scanning zones that are sequentially activated. Instead of having a sensor covering the entire screen simultaneously, the screen is segmented into regions that are scanned one after another, allowing a small sensor to cover the full screen over time through sequential scanning.
Solution Approach 2:
The system dynamically switches between different scanning zones on the display screen. The fingerprint recognition function transitions from a static full-screen sensor to a dynamic sequential scanning approach, where different portions of the screen are activated in different time intervals to achieve full-screen coverage with a small sensor.
2Area of stationary object
If a small-size fingerprint recognition sensor is used, then cost is reduced, but full-screen recognition capability is lost
Solution Approach 1:
The solution adds the time dimension to the spatial scanning process. A small sensor achieves full-screen coverage by scanning different zones at different times, transforming a 2D spatial problem into a 3D space-time solution where the sensor position remains fixed but the active scanning regions change over time.
Solution Approach 2:
The system uses dynamic sequential scanning where the display panel activates different scanning zones at different time intervals. This dynamic switching allows a small sensor to effectively cover the entire screen area by processing fingerprint data from different regions in sequence rather than simultaneously.
3Adaptability or versatility
If the fingerprint recognition sensor covers the entire display area, then full-screen recognition is enabled, but the device cost increases
Solution Approach 1:
The display panel is segmented into multiple independently controllable scanning zones. Instead of requiring a large sensor to cover the entire screen, each zone can be scanned sequentially by a small sensor, reducing the sensor size and overall device cost while maintaining full-screen recognition capability through time-multiplexed scanning.
Solution Approach 2:
The display panel itself serves dual functions: it displays visual content and simultaneously performs fingerprint scanning by controlling light emission in different zones. The display pixels are used to illuminate and scan fingerprint patterns, eliminating the need for separate illumination sources and reducing overall device complexity and cost.
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 configuration allows for effective fingerprint recognition across a full screen using a smaller sensor, thereby reducing the overall cost of the device by utilizing a smaller fingerprint recognition sensor while maintaining functionality.
Implementation Method 1
the collimator is configured to receive light rays reflected by a finger, and to convert the light rays into collimated light incident on the lens assembly
Implementation Method 2
the lens assembly is configured to converge the incident collimated light onto the fingerprint recognition sensor
Data Source
AI summary
The disclosure discloses a fingerprint recognition display device, the fingerprint recognition display device includes: a display panel, a fingerprint recognition sensor arranged on another side of the display panel than a light-emitting side thereof, and a lens assembly and a collimator arranged between the fingerprint recognition sensor and the display panel; wherein the collimator is arranged on a surface of the display panel facing away from the light-emitting side, and the lens assembly is arranged on a surface of the collimator on a side thereof facing away from the display panel, wherein a size of the fingerprint recognition sensor is smaller than a size of the display panel; the collimator is configured to receive light rays reflected by a finger, and to convert the light rays into collimated light incident on the lens assembly; and the lens assembly is configured to converge the collimated light onto the fingerprint recognition sensor.