Texture Recognition Pixel Circuit with Potential-Raising Signal Amplification
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Solution Overview
Problem
Existing texture sensing technologies, such as optical fingerprint sensing, face challenges in accurately distinguishing between ridge and valley reflections due to small potential differences in detection signals, leading to difficulties in texture recognition and reduced accuracy.
Innovation Solution
A texture recognition pixel circuit incorporating a photosensitive sub-circuit, potential raising sub-circuit, and driving output sub-circuit, along with a reset sub-circuit, to enhance signal detection and processing, including the use of transistors and storage capacitors to manage and amplify detection signals, thereby increasing the potential difference between ridge and valley reflections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If optical fingerprint sensing is used to acquire texture information, then the sensing technology can be widely applied, but the potential difference between ridge and valley reflections is small making accurate texture recognition difficult
Solution Approach 1:
The patent applies parameter changes by modifying the potential level of the reading node through the potential raising sub-circuit. By dynamically adjusting the reference potential and amplifying the voltage signal, the small potential differences between ridge and valley reflections are transformed into larger, more distinguishable signals, thereby improving measurement precision without increasing detection difficulty
Solution Approach 2:
The patent introduces an intermediary mechanism through the potential raising sub-circuit that includes transistors and capacitors. This intermediary circuit amplifies the detection signal by raising the potential of the reading node, acting as a mediator between the photosensitive sub-circuit and the output, making the small potential differences more detectable and improving texture recognition accuracy
2Measurement precision
If signal amplification is increased to improve texture recognition accuracy, then measurement precision improves, but device complexity increases
Solution Approach 1:
The patent segments the pixel circuit into three functional sub-circuits: photosensitive sub-circuit for optical signal detection, potential raising sub-circuit for signal amplification, and driving output sub-circuit for signal output. This segmentation allows each sub-circuit to perform its function efficiently with minimal complexity, avoiding the need for a single complex amplification circuit while achieving the desired signal precision
Solution Approach 2:
The patent implements multi-functionality by designing the pixel circuit to simultaneously perform photosensing, potential raising, and driving output functions. The same reading node and transistor structures serve multiple purposes: detecting optical signals, amplifying potentials, and driving output, thereby improving detection precision without proportionally increasing device complexity
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 texture recognition by increasing the potential difference in detection signals, simplifying the manufacturing process, and reducing the difficulty of signal analysis, while maintaining a compact circuit design.
Implementation Method 1
the photosensitive sub-circuit is configured to sense an optical signal including texture information, convert the optical signal into a first detection signal
Data Source
AI summary
A texture recognition pixel circuit includes a photosensitive sub-circuit, a potential raising sub-circuit and a driving output sub-circuit. The photosensitive sub-circuit is configured to, under control of a first voltage transmitted by a first voltage terminal and a potential of the reading node, sense an optical signal including texture information, convert the optical signal into a first detection signal, and transmit the first detection signal to a reading node. The potential raising sub-circuit is configured to, due to an action of a second voltage signal transmitted by a second voltage signal terminal, raise the potential of the reading node. The driving output sub-circuit is configured to, due to an action of the first detection signal that is raised, a third voltage signal transmitted by a third voltage signal terminal and a fourth voltage signal transmitted by a fourth voltage signal terminal, generate and output a second detection signal.