Image display device and headup display equipped with image display device

1. An image display device used in a head-up display, the image display device comprising:

an illumination unit including a plurality of light sources;

a light guide plate including an incident surface which light from the illumination unit enters, the incident surface including a plurality of convex surfaces which is opposed to the respective plurality of light sources, an output surface disposed in a direction intersecting the incident surface and from which the light incident from the incident surface is output, and a counter surface opposed to the output surface;

a light beam controller that is arranged to cover a part of the output surface and controls a traveling direction of the light output from the output surface; and

a display that transmits the light output from the light beam controller to display an image,

wherein a first lenticular lens array is provided on a part of the output surface on which the light beam controller is not arranged.

2. The image display device according to claim 1 , wherein

the plurality of light sources are arrayed in a first direction, and

the first lenticular lens array is arrayed in a second direction intersecting the first direction.

3. The image display device according to claim 2 , wherein a second lenticular lens array arrayed in the first direction intersecting the first lenticular lens array is arrayed on a part of the output surface on which the light beam controller is arranged.

4. The image display device according to claim 3 , wherein

the second lenticular lens array has a plurality of cylindrical shape parts, and

a generating axis of each of the plurality of cylindrical shape parts is parallel to the second direction.

5. The image display device according to claim 1 , wherein the plurality of convex surfaces are curved while projecting in a direction opposed to the respective plurality of light sources, and

an axis of a curvature center in each of the plurality of convex surfaces is perpendicular to the output surface.

6. The image display device according to claim 1 , wherein

at least a part of the counter surface is inclined with respect to the output surface.

7. The image display device according to claim 1 , wherein the light guide plate includes a reflection member disposed close to the counter surface.

8. The image display device according to claim 1 , wherein a gap between at least a part of the counter surface and the output surface decreases with increasing distance from the incident surface.

9. The image display device according to claim 1 , wherein a part of the counter surface, opposed to a part of the output surface on which the light beam controller is not arranged, is substantially parallel to the output surface, and a part of the counter surface, opposed to a part of the output surface on which the light beam controller is arranged, is inclined with respect to the output surface.

10. The image display device according to claim 1 , further comprising a concave lens between the light beam controller and the display.

11. The image display device according to claim 1 , wherein

the first lenticular lens array has a plurality of cylindrical shape parts, and

a generating axis of each of the plurality of cylindrical shape parts is parallel to the first direction.

12. The image display device according to claim 1 , wherein

a plurality of prism shape parts arrayed in the second direction are arrayed on a part of the counter surface opposed to a part of the output surface on which the light beam controller is not arranged.

13. The image display device according to claim 12 , wherein

a generating axis of each of the plurality of prism shape parts is parallel to the first direction.

14. The image display device according to claim 1 , wherein

a plurality of prism shape parts arrayed in the second direction are arrayed on a part of the counter surface opposed to a part of the output surface on which the light beam controller is arranged.

15. The image display device according to claim 14 , wherein

a generating axis of each of the plurality of prism shape parts is parallel to the first direction.

16. A head-up display comprising:

an image display device including

an illumination unit including a plurality of light sources,

a light guide plate including an incident surface which light from the illumination unit enters, the incident surface including a plurality of convex surfaces which is opposed to the respective plurality of light sources, an output surface disposed in a direction intersecting the incident surface and from which the light incident from the incident surface is output, and a counter surface opposed to the output surface,

a light beam controller that is arranged to cover a part of the output surface and controls a traveling direction of the light output from the output surface, and

a display that transmits the light output from the light beam controller to display an image,

a lenticular lens array being provided on a part of the output surface on which the light beam controller is not arranged; and

a reflection optical unit that reflects the light output from the image display device,

wherein the light output from the reflection optical unit is introduced to an eye-box of an observer through a transparent member, and the observer is caused to visually recognize a virtual image.