Patent ID: 8767017

Claim:
A projection type image display device for projecting and displaying an image on a recording surface of a recording facility, the projection type image display device comprising: a frame memory storing a prescribed auxiliary line image as a display image to be projected; and a means of reading out the image data from the frame memory and displaying the image data read out from the frame memory, wherein: the auxiliary line image, which is a guiding indication for recording on the recording surface of the recording facility, is constituted by background color and dashed auxiliary lines extending along a first direction, the dashed auxiliary lines being constituted by (i) dashes, which are pixels which have luminance or color that is different from that of the background color and (ii) pixels which have nearly identical luminance or color to that of the background color, a space between adjacent auxiliary lines is greater than a line width of the dashed auxiliary lines and the space is constituted by the background color; and the dashed auxiliary lines are written to the frame memory and are displayed so as to move dash display areas, at fixed time intervals or arbitrary time intervals, on a trajectory of a figure represented by the dashed auxiliary lines, the trajectory of the figure is displayed with other portions, which do not constitute a trajectory of a figure in the display image, in order to make the auxiliary line image be the guiding indication, the dashed auxiliary lines are displayed so as not to move the dash display areas on any position other than the trajectory of the figure, and the auxiliary line image as a whole is projected and displayed on an identical position with respect to a second direction perpendicular to the first direction on the recording surface of the recording facility.