| 摘要 |
PURPOSE:To display all necessary contents by single-time display switching operation and to make no unnecessary display by using display data stored in a subordinate refresh buffer and displaying one of windows of a multi-window display on a subordinate display. CONSTITUTION:When display switching for displaying the contents of a display screen 23 in a display screen 24 of a 2nd display device 22 is performed, a control part 2 grasps which window a current screen is displayed in first. Then image data to be displayed is specified in a 1st area 13 of a logical screen buffer 4 and, for example, image data A is copied to a 2nd area 14 and further converted into image data as display data, which is stored in a 2nd refresh buffer 12. Consequently, when the display screen 24 is displayed, the window which is displayed partially in the display screen 23 is all displayed. Consequently, necessary information can all be displayed speedily and an unnecessary display can surely be omitted. |
