LED Display Power Consumption Analysis for Fingerprint Capture
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Solution Overview
Problem
Existing LED display devices require significant modifications to their internal architecture to incorporate fingerprint capture functionality, which involves adding additional circuits and wiring, thereby increasing costs and complexity.
Innovation Solution
A method that analyzes variations in the overall power consumption of an LED matrix to capture images, including fingerprints, without modifying the display device's architecture. This is achieved by measuring current, voltage, or electromagnetic radiation and synchronizing the analysis with the scanning of the LED matrix pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If additional circuits and wiring are added to enable fingerprint capture functionality, then image capture capability is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent applies multi-functionality by enabling LED display pixels to serve dual purposes: displaying visual information and capturing fingerprint images. The same LED array that displays images is used to emit light for fingerprint capture, and the same photodetector circuits that read display data are used to capture fingerprint reflectance patterns. This eliminates the need for separate dedicated fingerprint sensing hardware.
Solution Approach 2:
The patent merges the fingerprint capture function with the existing display structure by integrating the sensing capability into the display pixels themselves. The display driver circuits are repurposed to also function as readout circuits for fingerprint data, combining what would traditionally be separate systems into a unified architecture.
2Adaptability or versatility
If additional circuits and wiring are added to enable fingerprint capture functionality, then image capture capability is improved, but manufacturing cost increases
Solution Approach 1:
The patent applies multi-functionality by enabling LED display pixels to serve dual purposes: displaying visual information and capturing fingerprint images. The same LED array that displays images is used to emit light for fingerprint capture, and the same photodetector circuits that read display data are used to capture fingerprint reflectance patterns. This eliminates the need for separate dedicated fingerprint sensing hardware.
Solution Approach 2:
The display device serves itself by using its own LED pixels as both the light source and the sensing element for fingerprint capture. The existing display infrastructure provides all necessary functions without requiring external or additional specialized components, making the system self-sufficient and cost-effective.
3Adaptability or versatility
If LED display architecture is modified to include fingerprint capture, then image capture functionality is achieved, but ease of manufacture deteriorates
Solution Approach 1:
The patent applies multi-functionality by enabling LED display pixels to serve dual purposes: displaying visual information and capturing fingerprint images. The same LED array that displays images is used to emit light for fingerprint capture, and the same photodetector circuits that read display data are used to capture fingerprint reflectance patterns. This eliminates the need for separate dedicated fingerprint sensing hardware.
Solution Approach 2:
The patent implements dynamic multiplexing where the display pixels are switched between display mode and sensing mode in time-division manner. During fingerprint capture, the LEDs emit light and the photodetectors read the reflected light patterns. This dynamic switching allows the same hardware to perform different functions at different times without requiring physical reconfiguration or additional components.
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 the capture of images and fingerprints on LED display devices without the need for additional measurement means or architectural modifications, thus reducing costs and complexity while maintaining effective image capture functionality.
Implementation Method 1
Most LEDs can also function as photodiodes. Thus, U.S. Pat. Nos. 7,598,949 and 9,632,344 have suggested using this functionality by describing an LED display screen suitable for capturing especially a fingerprint of a finger placed on the display screen.
Data Source
AI summary
A method for generating an image signal of an object by way of a display device including a display screen including light-emitting diodes arranged in rows and columns, the method including displaying a series of images each representing one respective pattern leading to the emission of a light beam that may be identical or different to the preceding light beam depending on whether the displayed pattern is identical or different to the pattern of the preceding image, acquiring a plurality of measurements of the power consumption of the display device during the display of each image while each light beam scans a surface of the object, acquiring a plurality of measurements of the variations in the power consumption of the display device and delivering an image signal of the object.