Frame Rate Conversion Buffer Switching Timing
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Solution Overview
Problem
Conventional frame rate conversion methods using two buffers cannot completely avoid frame tearing due to simultaneous reading and writing from the same buffer, caused by the difference in input and output frame rates.
Innovation Solution
The method involves alternatively accessing two buffers according to different frame rates, with buffer-switching and selection points adjusted between the data enable and v-sync signals to prevent frame tearing, ensuring that only one buffer is accessed at a time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If two buffers are used for frame rate conversion with switching based on v-sync signal pulses, then frame rate conversion can be performed, but frame tearing cannot be completely avoided due to simultaneous read and write operations on the same buffer
Solution Approach 1:
The patent applies preliminary action by switching the buffer before the v-sync signal pulse occurs. Specifically, the buffer switching is performed in advance during the porch period (before the active video display period), ensuring that the buffer selection is already determined before simultaneous read-write operations could cause frame tearing. This proactive timing prevents the harmful overlap of operations on the same buffer.
Solution Approach 2:
The patent uses the porch period as an intermediary time window between the data enable signal and v-sync signal to perform buffer switching. This intermediary period acts as a safe zone where buffer transitions can occur without interfering with active frame data, mediating between the need for buffer switching and the requirement to prevent frame tearing during active display periods.
2Device complexity
If buffer switching is performed at v-sync signal pulses, then frame rate conversion is simplified, but the same buffer may be read and written simultaneously causing frame tearing
Solution Approach 1:
The buffer switching is performed in advance before the v-sync signal pulse, during the porch period. This preliminary timing ensures that the buffer selection is established before the critical read-write operations begin, preventing frame tearing while maintaining relatively simple control logic based on signal timing.
Solution Approach 2:
The patent dynamically adjusts the buffer switching timing to occur during the porch period rather than at fixed v-sync pulses. This dynamic timing adaptation allows the system to avoid simultaneous read-write conflicts on the same buffer while still maintaining a systematic approach to buffer management.
Data Source
AI summary
A method for converting a frame rate of a video signal comprising a data enable signal by means of a first buffer and a second buffer is disclosed. The method comprises: alternatively accessing the first buffer and the second buffer according to a first frame rate; determining an accessing time point of the first and the second buffers according to the data enable signal; and accessing the buffer, which is one of the first and the second buffers and not accessed at the accessing time point, according to a second frame rate, wherein the second frame rate is faster than the first frame rate.