LCD Pixel Units with Integrated Photodetectors for Biometric Sensing
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Solution Overview
Problem
Conventional liquid crystal display (LCD) monitors lack biometric recognition functionality such as palmprint or fingerprint recognition, limiting their functionality in modern electronic devices.
Innovation Solution
Integration of semiconductor photodetectors within LCD pixel units to detect biometric information, combined with an active matrix organic light emitting display (AMOLED) panel, allowing for both image display and biometric signal sensing capabilities, utilizing a time-division driving mode to differentiate between ridge and valley line signals for enhanced sensitivity and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If semiconductor photodetectors are integrated into LCD pixel units for biometric detection, then biometric recognition functionality is added, but device complexity increases
Solution Approach 1:
The patent combines LCD display functionality with biometric sensing functionality by integrating semiconductor photodetectors into the LCD pixel units. The same pixel structure serves dual purposes: displaying images through liquid crystal modulation and detecting biometric information through photodetector light sensing, thereby adding versatility while minimizing additional complexity
Solution Approach 2:
The LCD pixel units are designed to perform multiple functions simultaneously - they serve as both display elements for image output and as sensing elements for biometric detection. The semiconductor photodetectors integrated within the pixel units enable the display device to function as both a visual interface and a biometric recognition system
2Measurement precision
If photodetectors are integrated into subpixels for biometric detection, then measurement precision of biometric signals is improved, but manufacturing complexity increases
Solution Approach 1:
The patent divides the biometric detection function into discrete semiconductor photodetector units that are integrated into individual pixel units or subpixels. This segmentation allows each photodetector to independently detect light intensity changes, improving measurement precision while enabling modular manufacturing processes where photodetectors can be fabricated and integrated using existing semiconductor fabrication techniques
Solution Approach 2:
The patent utilizes the photoelectric effect parameter change - converting light intensity variations caused by palmprint or fingerprint patterns into electrical signals. By monitoring changes in light intensity detected by the photodetectors, the system achieves high measurement precision for biometric recognition without requiring complex mechanical or optical scanning mechanisms
3Measurement precision
If time-division driving mode is used to differentiate ridge and valley line signals, then measurement precision of biometric information is improved, but loss of time increases
Solution Approach 1:
The patent employs time-division driving mode where the LCD pixel units are sequentially switched between display operation and biometric detection operation. During specific time intervals, the pixel units are configured to detect biometric signals by monitoring light intensity changes, while during other intervals they perform normal display functions. This periodic switching enables high measurement precision for distinguishing ridge and valley line patterns without requiring continuous detection that would consume excessive time
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
The solution enables a display apparatus with enhanced sensitivity in detecting biometric signals and improved accuracy in recognizing biometric information, while maintaining a simplified structure and improved functionality compared to conventional LCDs.
Implementation Method 1
each LCD pixel unit comprising one or more LCD subpixels, at least some of the plurality of LCD pixel units comprising a semiconductor photodetector in at least one LCD subpixel for detecting biometric information
Data Source
AI summary
The present application discloses a display apparatus including a liquid crystal display (LCD) panel having an array of a plurality of LCD pixel units; each LCD pixel unit including one or more LCD subpixels, at least some of the plurality of LCD pixel units having a semiconductor photodetector in at least one LCD subpixel for detecting biometric information; and an active matrix organic light emitting display (AMOLED) panel having an array of a plurality of AMOLED pixel units, each AMOLED pixel unit including one or more AMOLED subpixels, each of which having an organic light emitting diode. Each AMOLED subpixel corresponds to one or more LCD subpixel.