Fingerprint Recognition Noise Reduction Circuit for Display Substrates
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Solution Overview
Problem
Conventional liquid crystal display panels face challenges in integrating fingerprint recognition due to interference from display circuits and complex optical paths, leading to low accuracy in fingerprint recognition.
Innovation Solution
A fingerprint recognition device with a noise reduction circuit having a resistance greater than a preset value, coupled in series with the fingerprint recognition signal line, reduces interference and improves accuracy by filtering out noise and amplifying the detection current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If fingerprint recognition is integrated into a liquid crystal display panel, then the display panel can perform both display and fingerprint recognition functions, but the interference from display circuits and complex optical paths reduces fingerprint recognition accuracy
Solution Approach 1:
The patent segments the display panel into distinct functional regions: display areas with liquid crystal pixels and fingerprint recognition areas with photodiode arrays. This spatial segmentation allows independent optimization of each function, reducing interference between display circuits and fingerprint sensing while maintaining both functionalities in a single integrated panel
Solution Approach 2:
The patent introduces a light blocking layer as an intermediary component between the liquid crystal display layer and the photodiode array. This intermediary structure controls optical paths, prevents display light from interfering with fingerprint sensing, and enables accurate fingerprint recognition while maintaining display functionality
2Productivity
If display circuits are present in the display panel, then the panel can perform normal display functions, but the display circuits generate interference noise that affects fingerprint signal collection
Solution Approach 1:
The patent extracts the fingerprint sensing function into a separate photodiode array layer positioned behind the liquid crystal display layer. This extraction allows the display circuits to operate independently for display functions while the photodiode array collects fingerprint signals through controlled optical paths, minimizing mutual interference between the two functions
Solution Approach 2:
The patent applies local quality by creating regions with different optical properties: the liquid crystal display areas have optical characteristics optimized for light transmission and display, while the fingerprint recognition areas have different optical characteristics optimized for light absorption and signal detection by photodiodes, reducing cross-interference
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 effectively enhances the accuracy of fingerprint recognition by reducing interference from display elements, allowing for precise determination of fingerprint morphology.
Implementation Method 1
each of the fingerprint detection components including a photodiode
Data Source
AI summary
The present disclosure discloses a fingerprint recognition device, a display substrate and a display apparatus. The fingerprint recognition device includes: at least one fingerprint detection component; at least one fingerprint recognition signal line, the fingerprint detection component outputs a detection current to the fingerprint recognition signal line; at least one noise reduction circuit serially coupled in the fingerprint recognition signal line, the noise reduction circuit being a resistive component; and a fingerprint determination circuit coupled to the fingerprint recognition signal line, configured to determine a morphology of a fingerprint according to a current signal, subjected to a noise reduction by the noise reduction circuit and transmitted by the fingerprint recognition signal line. The fingerprint recognition device can filter out the current generated by coupling the fingerprint recognition signal line with other data lines, the interference with the detection current is reduced, the accuracy of the fingerprint recognition is improved.