US 10,255,865 B2 · Data processing device connected with display device and control method of display device

Abstract

The present invention provides a data processing device connected with an intermission driving. The data processing device achieves a satisfactory power saving while ensuring a high level of display quality of the display device. Upon detection of non-data update in a frame buffer, the host calculates a next refreshing timing based on driving information obtained from a liquid crystal display device (LCD), sets a timer for a timeout after a length of time representing the calculated result, and then the host and the LCD shift to Intermission State 1. Thereafter, when the timer times out to bring the host back to Normal State and a data update at the frame buffer is detected, data for refreshing an display image in the LCD is transferred from the host to the LCD. If the amount of time representing the calculated result is longer than a predetermined baseline, a shift is made to Intermission State 2 which provides greater power saving than Intermission State 1.

Claims17

Dependent claims

A data processing device connected data-exchangeably with a display device which drives a display section in such a manner that a refreshing period during which an image displayed in the display section is refreshed and a non-refreshing period during which an image displayed in the display section is not refreshed are alternated with each other, the data processing device comprising:

a frame buffer configured to store image data representing an image to be displayed in the display section;
an update detection section configured to detect an update of image data in the frame buffer;
a data transfer controller configured to:
transfer image data stored in the frame buffer to the display device when the update detection section detects an update of image data in the frame buffer;
determine a next refreshing timing of the display image in the display section based on refreshing-related information obtained from the display device as information regarding refreshing timing determination of the display image in the display section and assume an intermission state for an intermission period corresponding to the next refreshing timing when the update detection section detects a non-update of the image data in the frame buffer for a predetermined period;
and transfer image data stored in the frame buffer to the display device upon returning from the intermission state to a normal state.

3 more elements

A method for enabling a data processing device to control a display device which is connected data-exchangeably therewith and drives a display section in such a manner that a refreshing period during which an image displayed in the display section is refreshed and a non-refreshing period during which an image displayed in the display section is not refreshed are alternated with each other, the method comprising:

an update detection step of detecting an update of image data in a frame buffer which is provided in the data processing device for storage of image data representing an image to be displayed in the display section;
an updated-data transfer step of transferring image data stored in the frame buffer to the display device upon detection of an update of image data in the frame buffer;
an intermission step of determining a next refreshing timing of the display image in the display section based on refreshing-related information obtained from the display device as information regarding refreshing timing determination of the display image in the display section, and assuming an intermission state for an intermission period corresponding to the next refreshing timing, upon detection of a non-update of image data in the frame buffer for the predetermined period;
and
a refreshing-data transfer step of transferring image data stored in the frame buffer upon returning from the intermission state to a normal state.

2 more elements

Dependencies are inferred from the claim text.

Data processing device connected with display device and control method of display device

Life of this patent

Data processing device connected with display device and control method of display device

Life of this patent

Abstract

Claims17