Patent ID: 9704215
Date: 2017-07-11
CPC Classifications: G06T,G09G

Claim:
1. A display device, comprising: a source including an embedded display port (eDP) transmitter; and a sink including a display portion, the sink operatively connected with the source via an eDP interface to provide signal transmission between the source and the sink and to enable a panel self refresh (PSR) mode for reducing power consumption, wherein, in response to an input image being a still image, the source applies operating power to a frame buffer of the sink and transmits data of the still image to the sink, wherein the sink losslessly compresses the data of the still image and determines the size of the compressed data, wherein the sink: determines whether or not the compressed data of the still image has a size that can be stored in the frame buffer by comparing the size of the compressed data of the still image with a predetermined size of the frame buffer, outputs a first control signal to the source if the compressed data of the still image has a size that can be stored in the frame buffer, based on the comparing of the size, and outputs a second control signal to the source if the compressed data of the still image has a size that cannot be stored in the frame buffer, based on the comparing of the size, wherein the source: receives one of the first and second control signals from the sink, activates the panel self refresh mode in response to the first control signal, and deactivates the panel self refresh mode in response to the second control signal, wherein the source activates the panel self refresh mode when the size of the compressed data of the still image is less than or equal to the size of the frame buffer, wherein the source deactivates the panel self refresh mode when the size of the compressed data of the still image is greater than the size of the frame buffer, wherein the sink further includes: a lossless capability determiner to determine whether or not the compressed data can be stored in the frame buffer by comparing a size of an address to store the compressed data with a predetermined maximum address size of the frame buffer; a compressor to losslessly compress the data of the still image by a lossless compression algorithm; and a recoverer to be enabled when the panel self refresh mode is activated, and to recover the compressed data stored in the frame buffer, and wherein, if the panel self refresh mode is deactivated: the sink turns off the operating power for elements that perform the panel self refresh mode, the elements including the compressor, the frame buffer, and the recoverer.