Frame buffer management and self-refresh control in a self-refresh display system

摘要

A system and method are disclosed is to prevent the screen tearing in a video display system with self-refresh features while limiting space used for memory size in the self-refreshing sink device. A flexible method is utilized to manage a frame buffer and control self-refresh display timing to prevent screen tearing. The sink device has capabilities including one or more of self-refreshing and applying single frame updates as well as burst single frame updates while self-refresh is active. The memory utilized by the frame buffer during self-refresh is limited to less than that needed to store two full frames of video.

主权项

1. A method for controlling a self-refresh display system, the method comprising:
receiving a first video frame from a video source; storing the first video frame in a frame buffer; outputting the first video frame for display on a screen; receiving a second video frame from the video source; storing a first portion of the second video frame in an unused portion of the frame buffer, the unused portion of the frame comprising a specified number of lines, the specified number of lines being less than a number of lines of the second video frame; storing a second portion of the second video frame in the frame buffer by overwriting one or more lines of the first video frame; and outputting the second video frame for display on the screen.