Organic Image Sensor Driving Circuit for Moiré Suppression
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Solution Overview
Problem
Image sensors using silicon photoelectric conversion members face challenges with luminance and color moiré issues when capturing high-resolution images, and existing solutions like optical low-pass filters reduce resolution, while organic photoelectric conversion materials suffer from slow response times leading to afterimages.
Innovation Solution
An image sensor configuration with an organic photoelectric film, pixel electrodes arranged in a matrix, and a driving circuit that applies on-voltages and off-voltages to specific pixel electrode lines to control photoelectric conversion regions, optimizing exposure time based on illuminance and capacitance to reduce residual carriers and improve image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an optical low-pass filter is mounted to suppress moiré, then luminance moiré and color moiré are suppressed, but resolution is lowered
Solution Approach 1:
The pixel array is divided into multiple independently controllable regions (first pixel region, second pixel region, third pixel region) with different photoelectric conversion conditions. This segmentation allows selective application of photoelectric conversion to specific regions, enabling moiré suppression in the second pixel region while maintaining high resolution in the first and third regions by avoiding the need for an optical low-pass filter.
Solution Approach 2:
Different photoelectric conversion conditions are applied to different pixel regions. The second pixel region has photoelectric conversion stopped to suppress moiré, while the first and third regions maintain normal photoelectric conversion for high-resolution imaging. This local differentiation resolves the contradiction by applying quality control only where needed.
2Manufacturing precision
If organic photoelectric conversion material is used to achieve high resolution without optical low-pass filter, then resolution is maintained, but response time increases causing afterimages
Solution Approach 1:
The photoelectric conversion is controlled periodically through sequential scanning of multiple pixel regions. The first pixel region performs photoelectric conversion, then the second region is scanned with photoelectric conversion stopped, followed by the third region. This periodic activation and deactivation of photoelectric conversion in different regions allows the organic photoelectric material to fully respond and clear residual carriers before the next exposure cycle, eliminating afterimages while maintaining high resolution.
Solution Approach 2:
The scanning mechanism ensures continuous progression through different pixel regions in a systematic sequence. By continuously scanning and controlling photoelectric conversion across multiple regions in succession, the system maintains efficient image capture while allowing sufficient time for the organic photoelectric material to respond and clear residual carriers in each region before moving to the next.
3Duration of action of stationary object
If photoelectric conversion is continuously performed to maintain image capture, then imaging continuity is maintained, but residual carriers accumulate causing afterimages
Solution Approach 1:
Photoelectric conversion is performed periodically in a scanning sequence across different pixel regions rather than continuously in all regions simultaneously. The system activates photoelectric conversion in the first region, then deactivates it in the second region during scanning, and activates it again in the third region. This periodic on-off cycling allows residual carriers to be cleared during the off periods while maintaining overall imaging continuity through the scanning process.
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
This configuration enhances image quality and response characteristics by minimizing residual carriers and preventing afterimages, allowing for high-resolution imaging without the resolution loss associated with optical low-pass filters.
Implementation Method 1
an organic photoelectric film 20 on the substrate 10... The organic photoelectric film may be configured to perform photoelectric conversion of incident light
Data Source
AI summary
An organic photoelectric film on a substrate may perform photoelectric conversion of incident light. Pixel electrodes are arranged in a matrix form in an X-axis direction and a Y-axis direction between the substrate and the organic photoelectric film. A driving circuit may read pixel information from each pixel electrode of a pixel electrode line including a plurality of pixel electrodes arranged in the X-axis direction, and applies an on-voltage or an off-voltage to each pixel electrode 40 of the pixel electrode line. The driving circuit may scan a photoelectric conversion ON region to which the on-voltage is applied in the −Y-axis direction in synchronization with a timing of scanning a read line to which the pixel information is read in the −Y-axis direction.