In order to enlarge the image size and viewing zone angle of a hologram, an image generated by a high-speed spatial
light modulator (SLM) is converted into a vertically long image by an anamorphic imaging system, and this image is
scanned horizontally by a galvano scanner. The reduction of the horizontal pixel pitch of the SLM provides a wide
viewing zone angle. The increase of the image height and horizontal scan enlarge the image size. In this study, a digital
micromirror device (DMD) with the resolution of 1,024×768 was used as a high-speed SLM. A laser diode with the
wavelength of 635 nm was used as a light source. An anamorphic imaging system had the magnifications of 0.183 and
5.0 in the horizontal and vertical directions, respectively, to generate a vertically long image with the size of 2.56
mm×52.5 mm. The horizontal pixel pitch was reduced to 2.5 μm to provide the horizontal viewing zone angle of 15°.
The horizontal scan width of the galvano scanner was 73.1 mm, so the resultant image size was 73.1 mm×52.5 mm. The
scanning frequency of the galvano scanner was 60 Hz and the frame rate of the DMD was 13.333 kHz so that one
hologram consisted of 222 vertically long images. The vertically long images were displayed with the horizontal pitch of
0.32 mm and there were substantial overlaps. We succeeded the generation of a hologram image having 15° horizontal
viewing zone angle and 3.5" screen size with a 60 Hz frame rate.