| 摘要 |
In order to solve a problem that when displaying a plurality of overlapped windows, the occupied ratio of a common data bus increases, there is no way but to improve the operating speed of the data bus in order to display data as much as possible and as a result, power consumption increases, only data actually displayed visibly on a screen is read by slicing the screen at the vertex coordinates (X, Y) of overlapped windows and setting a starting address in VRAM and a step width for each sliced rectangular area, instead of reading the display data in all windows from the VRAM.
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