| 摘要 |
A conventional display device, such as a marking engine for a laser printer or digital copier, having a nominal resolution (where the energy source for the display device can be selectively activated) and a predetermined threshold level for producing output image dots, (see Fig. 5), is modified to a different (higher or lower) resolution or modified to produce output dots along axes (7, 9 and 11 in Fig. 10) different from the axes (3,5) of the display device (such as for producing halftone screens on angles), by using different resolution input data, and by selectively activating the energy source to produce overlap areas (see Fig. 10) that exceed the device threshold and thereby produce dots (17) at positions that are not on the normal resolution positions of the device (lines 3 and 5). Such threshold exceeding overlap areas may be achieved by activating the marking engine's energy source at a plurality of positions, with the energy at some positions being selectively below the threshold level for producing an output dot, but with the combined energy at the desired dot positions being above the threshold level to produce the desired dot (see Figs 6, 7 and 8).
|
