SCREEN SYNTHESISING DEVICE AND SCREEN SYNTHESISING METHOD

摘要

Disclosed is a screen synthesising device which can achieve greater power saving effects when synthesising a plurality of display screens containing moving images, without affecting the display result. In the disclosed device, an upper-layer frame synthesis unit (106) synthesises inputted display layers into a first frame, a lower-layer frame synthesis unit (108) synthesises inputted display layers into a second frame, a display screen synthesis output processing unit (112) synthesises the first frame and the second frame and generates a display screen, a synthesis destination allocation determination unit (105) has a plurality of display layers as an input, said layers including a first display layer having the first frame as a synthesis destination candidate and a second display layer having the second frame as a synthesis destination candidate, and determines to synthesise the display layer which is the object of determination among the plurality of display layers, in either the first frame or the second frame on the basis of layout information which shows the positional relationship between the display layer which is the object of determination and a determination reference region which corresponds to the display layer which is the object of determination, and on the basis of the synthesis processing costs of the first frame and the second frame.