Solid-State Imaging Device Power Supply Voltage Stabilization
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Solution Overview
Problem
In solid-state imaging devices connected with long power supply cables, voltage drops occur due to cable length, sensor type, and load current changes, affecting image quality and requiring high initial power voltage to compensate, which is not efficiently managed by existing technologies.
Innovation Solution
A solid-state imaging device with a detection circuit and output selecting circuit that monitors and adjusts power supply voltage by generating digital signals corresponding to detected voltage, allowing for real-time adjustment and stabilization of power supply, thereby maintaining optimal image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a high power voltage is supplied to compensate for voltage drop in long cables, then the power supply voltage at the sensor can be maintained, but the energy loss increases and the system efficiency decreases
Solution Approach 1:
The patent implements a feedback mechanism where a detection circuit continuously monitors the power supply voltage at the sensor and sends detection results back to the power supply control unit. Based on this feedback, the control unit dynamically adjusts the power supply voltage to compensate for cable losses without requiring excessive initial voltage, thereby reducing energy waste while maintaining stable operation.
Solution Approach 2:
The system transitions from a static high voltage supply approach to a dynamic voltage adjustment mechanism. The power supply control unit continuously adapts the output voltage based on real-time detection results, allowing the system to optimize power delivery conditions and minimize energy loss in the cable while ensuring adequate voltage reaches the sensor.
2Reliability
If a detection circuit is added to monitor power supply voltage, then voltage stability can be improved, but the device complexity increases
Solution Approach 1:
The detection circuit is integrated within the solid-state imaging device itself rather than being a separate external component. The detection unit, output selecting circuit, and power supply control unit work as a unified system, where the detection circuit shares the same physical platform and control architecture as the imaging device, thereby minimizing additional complexity while achieving voltage stabilization.
3Measurement precision
If the detection circuit outputs voltage detection results continuously, then real-time monitoring is achieved, but the signal transmission bandwidth is consumed and image data transmission is affected
Solution Approach 1:
The detection circuit performs voltage measurements at specific periodic intervals rather than continuously. The output selecting circuit switches between image data and voltage detection results based on timing signals, allocating transmission bandwidth efficiently. This periodic sampling approach provides adequate monitoring precision while preserving signal transmission capacity for image data.
Solution Approach 2:
The system performs voltage detection and output switching in advance of potential power supply issues. By proactively monitoring voltage at predetermined intervals and switching outputs according to a pre-established timing schedule, the system prevents power supply problems before they affect image quality while maintaining efficient signal transmission.
Data Source
AI summary
In a solid-state imaging device, a power supply voltage is input to a power supply terminal. A power supply line connects together the power supply terminal and a first control circuit. A detection circuit detects the power supply voltage input to the power supply terminal and a first digital signal corresponding to the detected power supply voltage. An output terminal outputs the first digital signal output from the detection circuit and a second digital signal corresponding to pixel signals.