Setting Control Apparatus for Video Signal Integrity
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Solution Overview
Problem
Existing techniques for updating control values in storage elements within display or image pickup apparatuses risk incorrect setting due to incomplete setting in temporary storage, particularly during vertical blanking intervals.
Innovation Solution
A setting control apparatus with a storage control part that stores control values in a first storage part and generates a storage completion signal, allowing a read-out control part to perform the read-out operation only after the storage is complete, using SRAM for temporary storage and distinguishing between control values influencing and not influencing video signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the control value is updated in a vertical blanking interval using a temporary storage part, then the update timing is controlled, but the control value may be incorrectly set if updating starts before setting is completed
Solution Approach 1:
The patent applies preliminary action by completely setting the control value in the temporary storage part before initiating the read-out operation to the storage element. The setting control part finishes writing the control value to the temporary storage part, and only then does the read-out control part begin reading it out during the vertical blanking interval. This ensures the control value is fully prepared before update begins, preventing incorrect setting.
Solution Approach 2:
The patent uses an intermediary approach by introducing a temporary storage part as a buffer between the input interface and the final storage element. The control value is first set in the temporary storage part, then read out to the storage element during the vertical blanking interval. This intermediary structure allows separation of the setting and read-out operations, ensuring proper timing and preventing corruption.
2Object-affected harmful factors
If the control value is read out during vertical blanking interval, then video signal interference is avoided, but the read-out must wait for storage completion
Solution Approach 1:
The patent performs the setting of the control value in the temporary storage part before the vertical blanking interval begins. By completing the storage operation in advance and using a completion signal, the system prepares the control value ready for immediate read-out when the vertical blanking interval arrives, minimizing the actual time delay during the critical update window.
Solution Approach 2:
The patent implements feedback through a storage completion signal that is generated when the control value is fully set in the temporary storage part. This signal feeds back to the read-out control part, enabling it to start the read-out operation at the precise moment when storage is complete and the vertical blanking interval begins, thus optimizing the timing and reducing unnecessary delays.
Data Source
AI summary
A setting control apparatus includes a setting control part, a special register, and a read-out control part. The setting control part makes stored in a temporary storage part a control value used in a processing circuit, in response to an input of the control value. The special register is electrically connected to the processing circuit and serving as a storage element capable of storing the control value. The read-out control part controls a read-out operation for reading out the control value from the temporary storage part into the special register. The read-out control part performs the read-out operation at a predetermined timing after storing of the control value in the temporary storage part is completed.