Integrated Photodiode Detection Circuit for Multicolor Sensitivity
Solution Overview
Problem
Existing organic photodiodes (OPDs) face challenges in developing color scanners with sensitivity to different wavelengths.
Innovation Solution
A detection device comprising a first detection circuit with a first and second photodiode coupled in series and opposite directions, and a second detection circuit with a third photodiode, each sensitive to specific wavelengths, allowing for high detection sensitivity to red, green, and blue light, and optionally near-infrared light, using organic semiconductor materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple separate detection elements are used for different wavelengths, then detection sensitivity to different wavelengths is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple photodiodes (first photodiode sensitive to first wavelength, second photodiode sensitive to second wavelength, and third photodiode sensitive to third wavelength) into a single integrated detection device. These photodiodes are coupled in series with opposite directions to form a compact detection element that achieves multi-wavelength detection sensitivity while reducing device complexity by merging what would traditionally be separate detection components into one unified structure.
2Measurement precision
If multiple photodiodes are coupled in series with opposite directions, then detection sensitivity to multiple wavelengths is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies local quality by giving each photodiode specific directional characteristics tailored to its function. The first photodiode is oriented to detect first light, the second photodiode is oriented to detect second light, and the third photodiode is oriented to detect third light. This localized optimization of detection directionality for each component allows the system to achieve high multi-wavelength detection sensitivity while managing manufacturing precision requirements through functional specialization rather than uniform high-precision requirements across all 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
The device achieves high detection sensitivity to multiple wavelengths, reducing the need for multiple detection elements and enhancing color imaging capabilities.
Implementation Method 1
a first photodiode sensitive to first light and a second photodiode sensitive to second light... a third photodiode sensitive to third light
Data Source
AI summary
According to an aspect, a detection device includes: a first detection circuit including a first photodiode sensitive to first light and a second photodiode sensitive to second light; and a second detection circuit including a third photodiode sensitive to third light. The first photodiode and the second photodiode are coupled in series and in opposite directions to form a first detection element. One end side of the first detection element is coupled to a first signal line via a first transistor. Another end side of the first detection element is configured to be supplied with a first drive signal. A cathode of the third photodiode is coupled to a second signal line via a second transistor. An anode of the third photodiode is configured to be supplied with a second drive signal.