Amplifier Circuit for High Luminance Imaging Accuracy
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Solution Overview
Problem
Current imaging devices face challenges in increasing reading accuracy, especially at high image capturing luminance, and require a cost-effective solution with reduced terminal and wiring counts while maintaining image capture quality, including fingerprints.
Innovation Solution
A semiconductor device with an amplifier portion and conversion portion, utilizing a comparison circuit and capacitors to amplify and convert signal differences into digital values, and incorporating a selection circuit to reduce terminal counts, allowing for efficient image capture even in high luminance conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an amplifier circuit with set gain is used to expand dynamic range, then reading accuracy is improved, but device complexity increases
Solution Approach 1:
The amplifier portion is divided into multiple stages: a first amplifier that amplifies the input signal by a first gain, and a second amplifier that amplifies the output of the first amplifier by a second gain. This segmentation allows the total gain to be distributed across stages, improving reading accuracy while managing device complexity through modular design.
Solution Approach 2:
The patent employs variable gain amplifiers where the gain can be dynamically adjusted. The first amplifier has a first gain and the second amplifier has a second gain, allowing the system to adapt to different signal levels and imaging conditions. This dynamic gain control improves reading accuracy across varying luminance conditions without requiring a completely different device configuration.
2Measurement precision
If multiple terminals and wirings are used to achieve high reading accuracy, then measurement precision is improved, but ease of manufacture deteriorates
Solution Approach 1:
The patent combines the first amplifier and second amplifier into a single integrated amplifier portion within the imaging device. By merging these amplification functions into one module rather than requiring separate discrete components with individual terminals and wirings, the device achieves high reading accuracy while simplifying the manufacturing process and reducing the number of connection points required.
Solution Approach 2:
The amplifier portion is designed as a multi-functional unit that performs both the first amplification and second amplification stages within a single integrated structure. This universal design allows the same component to fulfill multiple amplification needs, reducing the overall number of terminals and wirings required while maintaining high reading accuracy.
Data Source
AI summary
The reading accuracy of an imaging device is increased. Clear image capturing is performed even in the case where the luminance is high. A reading circuit of the imaging device includes an amplifier portion and a conversion portion. The amplifier portion amplifies a potential difference between a first signal and a second signal that are sequentially input and outputs the amplified difference to the conversion portion. The conversion portion converts the output potential of the amplifier portion into a digital value. The amplifier portion is reset on the basis of a first reference potential and the first signal and amplifies the potential difference on the basis of a second reference potential that is different from the first reference potential and the second signal.