Display synchronization method and video display terminal

Abstract

The embodiment of the invention provides a display synchronization method and a video display terminal. The method comprises the following steps: receiving first frequency identification information;calculating a difference value between the first frequency identification information and second frequency identification information; determining a corresponding target difference value according tothe calculated difference value; judging whether an absolute value of the determined target difference value is greater than a first set threshold; if yes, calibrating the own determined target difference value by using a proportional differential PD algorithm; if no, calibrating the determined target difference value by using a proportional integral differential PID algorithm; determining a corresponding target voltage according to the calibrated target difference value; and adjusting the own actual output frequency according to the determined target voltage. By adoption of the scheme, the clock frequency of video display terminals can be quickly adjusted to be consistent with that of a main video display terminal, and the adjustment accuracy is well ensured as well.

Description

technical field [0001] The present invention relates to the technical field of video display, in particular to a display synchronization method and a video display terminal. Background technique [0002] In the field of video display technology, when video data from a front-end video source passes through a switch, the video data is often distributed to multiple video display terminals. It is desirable that the clock frequency of multiple video display terminals is the same, so as to ensure that each video display terminal can display the received video data synchronously. Generally speaking, the clock frequency of each video display terminal is generated based on its internal frequency generating device. It is easy to understand that even if the nominal frequencies of the frequency generating devices used by each video display terminal are the same, due to the influence of factory precision and other factors, the actual output frequency of each frequency generating device ...

AI Technical Summary

Problems solved by technology

It is easy to understand that even if the nominal frequencies of the frequency generating devices used by each video display terminal are the same, due to the influence of factory precision and other factors, the actual output frequency of each frequency generating device will still have certain differences. Correspondingly, each The clock frequency of the video display terminals is also different, each video display terminal will not be able to display the received video data synchronously

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