Introducing the Panel Self Refresh Technology

Inside the Panel Self Refresh Technology

The Panel Self Refresh technology works by using a new DisplayPort command, “capture static frame.” When this command is issued by the video engine, the display will capture the last image (frame) sent, storing it in its RAM memory (frame buffer). After this command is issued, the DisplayPort main link is turned off, and the Panel Self Refresh mode is enabled.

To exit the Panel Self Refresh mode, a wake-up command is issued through the DisplayPort auxiliary (AUX) link. After a brief synchronization period (“link training”), which lasts a few milliseconds, the display will be ready to receive new images (frames), and the system will be working as it did before entering the Panel Self Refresh mode.

In Figures 1 and 2, you can see a system supporting Panel Self Refresh technology. In Figure 1, the system is working normally, while in Figure 2, the system entered the Panel Self Refresh mode. The blocks in black are turned off for power saving.

Panel Self Refresh offFigure 1: Panel Self Refresh off

Panel Self Refresh onFigure 2: Panel Self Refresh on

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Author: Gabriel Torres

Gabriel Torres is a Brazilian best-selling ICT expert, with 24 books published. He started his online career in 1996, when he launched Clube do Hardware, which is one of the oldest and largest websites about technology in Brazil. He created Hardware Secrets in 1999 to expand his knowledge outside his home country.

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