Image processor and method therefor

摘要

By rendering lower half of 30 FPS in the processing of even numbered frame of 60 fps and rendering upper half of 30 fps in the processing of odd numbered frame, the processing load of the processor 70 can be reduced to half. Thus, by delaying image rendering, the image quality degradation can be prevented, therefore stable high-quality images can be displayed.

主权项

1. A sub-sub substrate comprising:
a display screen; a 30 frames per second (fps) use frame buffer including a first frame buffer and a second frame buffer, and configured to store image data of an image to be displayed on the display screen at a first rate, the first frame buffer and the second frame buffer being alternately selected by the 30 fps use frame buffer as a first rendering target and a first reading target; a 60 fps use frame buffer including a third frame buffer and a fourth frame buffer, and configured to store image data of a second rate which is shorter than the first rate, the image data of the second rate including first image data and second image data, the third frame buffer and the fourth frame buffer being selected as a second rendering target and a second reading target; and a control unit configured to:
when processing the first image data, clear a memory of the first rendering target among the first frame buffer and the second frame buffer, write the image data of the first rate corresponding into one or more first areas among a plurality of divided areas of the first rendering target and not write in a second area other than the one or more first areas,when processing the second image data, not clear the memory of the first rendering target in which the first image data is written, write the image data of the first rate corresponding to the one or more first areas into the second area among the plurality of divided areas, not write in the one or more first areas, then switch the first rendering target and the first reading target between the first frame buffer and the second frame buffer,between the processing of the first image data and the processing of the second image data, write the image data read from the alternately selected frame buffer of the first reading target into the selected frame buffer of the second rendering target among the third frame buffer and the fourth frame buffer, andbetween the processing of the first image data and the processing of the second image data, and before or after the writing image data read from the alternately selected frame buffer of the first reading target, write the first image data or the second image data of the second rate into a predetermined area of the selected frame buffer of the second rendering target, wherein the processing of the first image data or the processing of the second image data is performed after the later of 1) the writing image data read from the alternately selected frame buffer of the first reading target, and 2) the writing the first image data or the second image data of the second rate.