Image Sensor Interrupt Circuit Reduces Power Noise
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Solution Overview
Problem
The quality of captured image data is affected by noise generated during the image capturing process in existing image sensing systems.
Innovation Solution
An image sensing device and method that utilize a timing generator, image capturing circuit, first and second logic circuits, and an interrupt circuit to control the clock signal, interrupting the system clock to the second logic circuit during the reading duration, thereby reducing power noises caused by current generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the logic circuit operates continuously during image reading, then the reading process can proceed without interruption, but power noises are generated affecting image quality
Solution Approach 1:
The patent applies periodic action by controlling the logic circuit to operate only during specific time intervals (sensing period) and remain idle during other intervals (reading period). The clock signal is periodically enabled/disabled based on the operational phase, creating a rhythmic operation pattern that eliminates continuous operation and its associated noise generation.
Solution Approach 2:
The patent extracts the harmful operation of the logic circuit during the reading phase by completely disabling the clock signal to the logic circuit during this period. This separation isolates the noise-generating operation from the sensitive image reading process, allowing high-speed reading without interference from logic circuit power noises.
2Speed
If the clock signal is continuously provided to the logic circuit, then the logic circuit can perform operations without delay, but current is continuously generated causing power noise
Solution Approach 1:
The clock signal is provided periodically rather than continuously, synchronized with the sensing phase of the image sensor. During the sensing phase, the clock signal is enabled allowing full logic circuit operation at maximum speed. During the reading phase, the clock signal is disabled, stopping current consumption while maintaining reading operations through previously captured data.
Solution Approach 2:
The logic circuit performs all necessary operations during the sensing phase before the reading phase begins. By completing operations in advance while the clock signal is still active, the system prepares data for reading without requiring continuous clock operation, thereby eliminating current consumption during the subsequent reading phase.
Data Source
AI summary
An image sensing device and image sensing method is described, in which an interrupt circuit is disposed to interrupt a clock signal input to a logic circuit not associated with the reading of image data when the image data is read, so as to temporarily interrupt the operation of the logic circuit, thereby reducing the power noises caused by the current generated during the operation of the logic circuit.