| 摘要 |
<p>A surface with a discernible grey level being obtained by activating a certain proportion of the pixels of this surface, the screen is virtually divided into blocks of pixels all of the same dimensions, and, for each discernible grey level desired, a set of patterns is defined in advance, each representing one block, the various patterns of the same set all having the same proportion of active pixels, for example two out of sixteen for a grey of 2/16th in the scale going from white to black (20-27), but a different arrangement of the inactive pixels and of the active pixels, and, for displaying each pixel of the image, a pattern of the set corresponding to the desired grey level is selected, and the pixel is displayed with the active or inactive state of the point having the same position in the selected pattern. On each redefinition of an image, a different pattern (from 20 to 27) is chosen. Applications: static-image display devices, especially the video phone, the "Minitel", or portable computers. <IMAGE></p> |
