Solid-State Imaging Device Wiring Segmentation for Global Shutter
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Solution Overview
Problem
Solid-state imaging devices with CMOS sensors using the rolling shutter method suffer from image distortion when capturing fast-moving objects due to varying potential and signal delays along wiring resistances, and the global shutter method faces challenges in power consumption and potential variations.
Innovation Solution
A configuration where a first photosensor group and a second photosensor group share a wiring for potential control, using a transistor with a wide band gap semiconductor material to minimize off-state current, and employing field sequential operation to reduce power consumption and eliminate the need for color filters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a global shutter method is employed to capture fast-moving objects without distortion, then image quality is improved, but power consumption increases and potential variations occur due to simultaneous charge accumulation in all pixels
Solution Approach 1:
The pixel array is divided into multiple banks, with each bank having its own dedicated potential supply wiring. This segmentation allows different regions to be controlled independently, reducing the total current required on any single wiring while still enabling global shutter operation across the entire sensor array.
Solution Approach 2:
The patent introduces a bank dimension to the traditional row-column pixel addressing scheme. By organizing pixels into banks along the vertical direction and providing dedicated potential supply wirings for each bank, the system resolves the wiring resistance issue in the horizontal direction while maintaining global shutter capability across all pixels.
2Measurement precision
If wiring resistance is reduced to minimize potential decrease and signal delay, then signal accuracy is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The potential supply wirings are segmented into multiple independent lines, each serving a specific bank of pixels. This segmentation reduces the length and resistance of each individual wiring while maintaining comprehensive coverage of all pixels through the bank-based organization.
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 suppresses potential and signal delays, enabling high-quality image capture with reduced power consumption and increased efficiency in image data acquisition and display.
Implementation Method 1
Each pixel includes a photodiode
Implementation Method 2
a transistor with a wide band gap semiconductor material to minimize off-state current
Data Source
AI summary
An object is to provide a solid-state imaging device or a semiconductor display device with which a high-quality image can be taken. By performing operation using a global shutter method, a potential for controlling charge accumulation operation can be shared by all pixels. In addition, a first photosensor group includes a plurality of photosensors connected to a wiring supplied with an output signal, and a second photosensor group includes a plurality of photosensors connected to another wiring supplied with the output signal. A wiring for supplying a potential or a signal for controlling charge accumulation operation to the first photosensor group is connected to a wiring for supplying the potential or signal to the second photosensor group.