Self-refresh control method, sink device thereof and display system thereof
A self-refresh control method for a display system includes receiving a frame from a video source of the display system; storing the frame in a storage module of the display system according to a writing timing sequence signal; accessing data stored in the storage module as a self-refresh frame according to a reading timing sequence, for outputting the self-refresh frame to a display device of the display system; and adjusting the reading timing sequence signal according to the writing timing sequence signal and the reading timing sequence signal.
1. A sink device for a display system, comprising:
a selecting module, for selecting one of a video data signal and a self-refresh frame to a display device of the display system;
a receiving module, for receiving the video data signal from a video source of the display system, outputting the video data signal to the selecting module and generating a writing timing sequence signal according to the video data signal;
a storage module, for storing a frame of the video data signal as the self-refresh frame and outputting the self-refresh frame to the selecting module according to a reading control signal;
a displaying timing generating module, for generating a reading timing sequence signal corresponding to the reading control signal and adjusting the reading timing sequence signal according to a blanking indicating signal and a line conflict signal; and
a self-refreshing module, for generating the writing control signal and the reading control signal according to the writing timing sequence signal and the reading timing sequence signal, adjusting the reading timing sequence signal according to the writing timing sequence signal and the reading timing sequence signal via the blanking indicating signal and the line conflict signal.
2. The sink device of claim 1 , wherein the self-refreshing module comprises:
a blanking detecting unit, for detecting a writing interval between times of writing data of adjacent lines of the frame according to the writing timing sequence, comparing the writing interval with a minimum interval; and storing the writing interval as the minimum interval and instructing the displaying timing generating module to adjust reading intervals between times of accessing data of adjacent lines of the self-refresh frame to be equaled the minimum interval via the blanking indication signal when the writing interval is smaller than the minimum interval.
3. The sink device of claim 1 , wherein the self-refreshing module comprises:
a reading address generating unit, for generating a writing control signal according to the writing timing sequence signal;
a writing address generating unit, for generating a reading control signal according to the reading timing sequence signal; and
a comparing unit, for comparing the writing control signal and the reading control signal and instructing the displaying timing generating module to stop reading the data of the self-refresh frame when the writing control signal and the reading control signal indicate the same line of the self-refresh frame simultaneously.
4. The sink device of claim 1 , further comprising:
a compressing module, coupled between the receiving module and the storage module for compressing the frame, generating a compressed frame and storing the compressed frame to the storage module; and
a decompressing module, coupled between the storage module and the selecting module for accessing the compressed frame stored in the storage module, decompressing the frame compressed frame as the self-refresh frame and outputting the self-refresh frame to the selecting module.
5. The sink device of claim 1 , wherein the size of the storage module equals the size of the frame of the video data signal.
6. A display system, comprising:
a video source, for generating a video data signal;
a display device, for displaying an output signal;
a sink device, comprising:
a selecting module, for selecting one of a video data signal and a self-refresh frame as the output signal;
a receiving module, for receiving the video data signal, outputting the video data signal to the selecting module and generating a writing timing sequence signal according to the video data signal;
a storage module, for storing a frame of the video data signal as the self-refresh frame and outputting the self-refresh frame to the selecting module according to a reading control signal;
a displaying timing generating module, for generating a reading timing sequence signal corresponding to the reading control signal and adjusting the reading timing sequence signal according to a blanking indicating signal and a line conflict signal; and
a self-refreshing module, for generating the writing control signal and the reading control signal according to the writing timing sequence signal and the reading timing sequence signal, adjusting the reading timing sequence signal according to the writing timing sequence signal and the reading timing sequence signal via the blanking indicating signal and the line conflict signal.
7. The display system of claim 6 , wherein the self-refreshing module comprises:
a blanking detecting unit, for detecting a writing interval between times of writing data of adjacent lines of the frame according to the writing timing sequence, comparing the writing interval with a minimum interval; and storing the writing interval as the minimum interval and instructing the displaying timing generating module to adjust reading intervals between times of accessing data of adjacent lines of the self-refresh frame to be equaled the minimum interval via the blanking indication signal when the writing interval is smaller than the minimum interval.
8. The display system of claim 6 , wherein the self-refreshing module comprises:
a reading address generating unit, for generating a writing control signal according to the writing timing sequence signal;
a writing address generating unit, for generating a reading control signal according to the reading timing sequence signal; and
a comparing unit, for comparing the writing control signal and the reading control signal and instructing the displaying timing generating module to stop reading the data of the self-refresh frame when the writing control signal and the reading control signal indicate the same line of the self-refresh frame simultaneously.
9. The display system of claim 6 , the sink device further comprises:
a compressing module, coupled between the receiving module and the storage module for compressing the frame, generating a compressed frame and storing the compressed frame to the storage module; and
a decompressing module, coupled between the storage module and the selecting module for accessing the compressed frame stored in the storage module, decompressing the frame compressed frame as the self-refresh frame and outputting the self-refresh frame to the selecting module.
10. The display system of claim 6 , wherein the size of the storage module equals the size of the frame of the video data signal.