Image display device
Provided is an image display device capable of effectively enhancing image quality of a display image with a simple configuration. The image display device includes a light source, a screen configured to be two-dimensionally scanned with laser light to draw an image on the screen, a scanning unit configured to scan the screen with the laser light, a mirror drive circuit configured to drive the scanning unit, and an optical system configured to generate a virtual image of the image drawn on the screen. On the screen, a plurality of lens regions are arranged so as to individually line up in two directions different from each other. Rows of the lens regions in one of the two directions are inclined relatively at a predetermined inclination angle with respect to main scan directions of the laser light to the screen.
1. An image display device comprising:
a light source configured to emit laser light;
a screen configured to be two-dimensionally scanned with the laser light to draw an image on the screen;
a scanning unit configured to scan the screen with the laser light;
a drive unit configured to drive the scanning unit so that the laser light moves on the screen along a plurality of scan lines at predetermined intervals; and
an optical system configured to generate a virtual image of the image drawn on the screen,
wherein on the screen, a plurality of lens regions are arranged so as to line up in two directions different from each other, and
rows in one of the two directions of the lens regions are respectively inclined relatively at a predetermined inclination angle, between but not including 0 degrees and 90 degrees, with respect to main scan directions of the laser light to the screen.
2. The image display device according to claim 1 , wherein the inclination angle is set to 15° to 20°, inclusive.
3. The image display device according to claim 1 , wherein rows of the lens regions in an other of the two directions respectively extend in a direction perpendicular to the main scan directions.
4. The image display device according to claim 1 , wherein the screen includes:
a plurality of first lens portions extending in a first direction parallel to one of the two directions in one of an incident surface and an emission surface of the laser light, the plurality of first lens portions being configured to diverge the laser light only in a direction perpendicular to the first direction and
a plurality of second lens portions extending in a second direction parallel to the other of the two directions in the other of the incident surface and the emission surface of the laser light, the plurality of second lens portions being configured to diverge the laser light only in a direction perpendicular to the second direction,
wherein a region where each of the first lens portions and a corresponding one of the second lens portions overlap each other as seen in an incident direction of the laser light is one of the plurality of lens regions.
5. The image display device according to claim 4 , wherein tops of adjacent first lens portions among the first lens portions shift from each other by a predetermined distance along a thickness of the screen.
6. The image display device according to claim 4 , wherein tops of adjacent second lens portions shift from each other by a predetermined distance in a thickness direction of the screen.
7. The image display device according to claim 1 , wherein a pitch of the lens regions in each of the main scan directions is set larger than a beam diameter of the laser light in the relevant main scan directions.