The Displayport-organization demonstrated at the CES in Las Vegas, the Panel Self Refresh technology. Monitors are equipped with a memory chip that static images buffers. Only when changing image is a cable.
Intel announced the Panel Self Refresh technology already during IDF last fall, but a working demonstration we saw, not yet. The DisplayPort-organization, however, had a booth at the CES in which the power-saving technique demonstrated. A stripped-down lcd panel that has additional hardware for the PSR was provided with, was connected to a pc with a displayport cable.
With static images the image locally in the display is stored on a geheugenchipje of 5MB, enough for hd picture. The gpu of the system at those times no work to be done to image with 60Hz to the display. Only when the image refresh, the gpu is again put to work. That would be a saving for ultraportables or tablets of around ten percent can yield, especially when, in the future, active contrast and brightness is controlled.
The demonstration of PSR was simple; while the desktop of Windows was shown, showed a led with the activity of the PSR technique. If it was, the gpu is idle, while a disabled led an active gpu had pointed out. When PSR is active, could the displayport cable without any problems from the display to be drawn; the image remained.