Under-Display Fingerprint Sensing for Ambient-Light Adaptation
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Solution Overview
Problem
The accuracy of under-screen fingerprint identification is affected by external environmental changes, leading to increased false rejection and acceptance rates.
Innovation Solution
An optical fingerprint identification apparatus with a pixel array and color filter layer that determines the environmental lighting conditions to adjust capturing parameters, such as exposure time and gain, for improved fingerprint image capture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If under-screen fingerprint identification is performed using optical imaging, then fingerprint identification functionality is integrated into the display, but identification accuracy deteriorates under varying external lighting conditions
Solution Approach 1:
The patent dynamically adjusts capturing parameters (exposure time, gain, illumination intensity) based on detected environmental lighting conditions. The processing circuitry modifies these parameters in real-time to compensate for varying ambient light, thereby maintaining fingerprint identification accuracy while preserving the integrated under-screen design.
Solution Approach 2:
The system incorporates a feedback mechanism where the processing circuitry continuously monitors environmental lighting conditions and uses this information to adjust capturing parameters. This closed-loop control ensures that the fingerprint sensor adapts to changing light conditions, resolving the accuracy issue while maintaining the integrated display design.
2Measurement precision
If capturing parameters are dynamically adjusted according to environmental lighting, then fingerprint identification accuracy is improved, but device complexity increases
Solution Approach 1:
The patent combines the light sensing capability and fingerprint capturing function into a single integrated system. The same optical sensor array used for fingerprint imaging also detects ambient lighting conditions, and the processing circuitry performs both environmental assessment and fingerprint image processing. This merging reduces device complexity while maintaining improved accuracy through dynamic parameter adjustment.
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
Enhances fingerprint identification accuracy by adapting to varying lighting conditions, reducing false rejection and acceptance rates.
Implementation Method 1
imaging is performed according to the difference of reflection abilities of a ridge and a valley of a fingerprint to light
Implementation Method 2
An optical fingerprint identification apparatus with a pixel array and color filter layer that determines the environmental lighting conditions
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3~4
AI summary
Embodiments of the present application provide a fingerprint identification method, a fingerprint identification apparatus and an electronic device, which could effectively improve the accuracy of fingerprint identification. The fingerprint identification method is applied to a fingerprint identification apparatus disposed under a display screen of an electronic device, the fingerprint identification apparatus includes a pixel array and a colour filter layer, the colour filter layer includes at least one filter unit, and the at least one filter unit is disposed above at least one first type pixel of the pixel array, respectively, and the method includes: capturing a first light signal transmitting through the at least one filter unit and sensed by the first type pixel; determining a fingerprint identification environment according to an intensity of the first light signal; and determining, based on the fingerprint identification environment, a target capturing parameter of capturing a fingerprint light signal returned by reflection or scattering of a finger above the display screen, the fingerprint light signal being used for fingerprint identification.