Solid-State Imaging Driving Device Dynamic Blanking Adjustment
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Solution Overview
Problem
Conventional solid-state imaging apparatuses face challenges in maintaining a fixed frame rate during image transfer due to non-integer ratio relationships between internal and external clock frequencies, which conventional horizontal blanking mechanisms cannot fully resolve.
Innovation Solution
A solid-state imaging apparatus with a driving device that includes a position detection unit, difference detection unit, and adjustment unit to dynamically adjust the number of rows and columns in the blanking data by one pixel or arbitrary unit-clock time, ensuring synchronization between frame rate and data transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional horizontal blanking mechanism is used to adjust frame rate, then the frame rate can be partially improved, but the synchronization between internal and external frame rates cannot be completely resolved due to non-integer ratio relationships
Solution Approach 1:
The patent applies dynamics by making the blanking period variable rather than fixed. The driving device dynamically adjusts the blanking period based on the difference between internal and external frame rates, allowing the system to adapt to non-integer ratio relationships and maintain synchronization. This is achieved by detecting frame rate differences and adjusting the blanking period accordingly, transforming a static system into a dynamic one that can respond to varying conditions.
Solution Approach 2:
The patent changes the parameter of the blanking period from a fixed value to a variable value that can be adjusted based on frame rate differences. By modifying the blanking period parameter dynamically, the system can compensate for non-integer ratio relationships between internal and external clocks, thereby improving both frame rate control precision and synchronization reliability simultaneously.
2Productivity
If the internal clock frequency does not match the external frame rate clock, then data transfer can proceed, but the internal frame rate becomes slightly different from the external frame rate
Solution Approach 1:
The patent implements feedback by continuously detecting the difference between internal and external frame rates and using this information to adjust the blanking period. The frame rate detection unit monitors the actual frame rate, and when a difference is detected, the driving device adjusts the blanking period to correct the deviation. This closed-loop feedback mechanism ensures that data transfer continues at high speed while maintaining accurate frame rate synchronization.
Solution Approach 2:
The patent applies preliminary action by adjusting the blanking period in advance to prevent frame rate drift. Rather than waiting for significant deviations to occur, the system proactively modifies the blanking period based on detected differences, ensuring that frame rate accuracy is maintained throughout the data transfer process without compromising transfer speed.
3Ease of operation
If a fixed number of pixels is transferred at a fixed frame rate, then data transfer is simplified, but it is not possible to continue transferring data at a fixed frame rate when clock ratios are non-integer
Solution Approach 1:
The patent resolves this contradiction by making the blanking period dynamic rather than fixed. This allows the system to maintain simple data transfer operations while simultaneously enabling continuous transfer at fixed frame rates even with non-integer clock ratios. The dynamic adjustment of the blanking period bridges the gap between operational simplicity and continuous transfer capability.
Data Source
AI summary
There is provided a solid-state imaging apparatus including a driving device that reads image data from an imaging unit. When reading the image data from the imaging unit, the driving device renders the image data composed of image data having V rows and H columns and blanking data having V′ rows and H′ columns, and renders the amount of the image data changeable for at least every one frame.