초록 ▼

A holographic display device, e.g. for a vehicle, which reduces a color of hologram reflection toward the outside of the vehicle or a color of hologram transmission toward the inside of the vehicle generated at a hologram installation portion of a wind-proof glass, and which further reduces an exter

A holographic display device, e.g. for a vehicle, which reduces a color of hologram reflection toward the outside of the vehicle or a color of hologram transmission toward the inside of the vehicle generated at a hologram installation portion of a wind-proof glass, and which further reduces an external light noise. Light from a display element is transmitted through an imaging optical component to form a display image on a transmission diffusion hologram provided to a wind-proof glass, and the display image is reflected on the surface on the vehicle outer side of the wind-proof glass for visual recognition by an observer. The above transmission diffusion hologram is produced by diffused light, which is transmitted through a diffusion optical component, being made to fall on one side of a hologram photosensitive material.

대표청구항 ▼

1. A holographic display device which forms a display image of light containing information projected from a light-emitting display, on a diffusion hologram provided on a fixed substrate, the fixed substrate including a first surface on a side of the diffusion hologram facing the light-emitting disp

1. A holographic display device which forms a display image of light containing information projected from a light-emitting display, on a diffusion hologram provided on a fixed substrate, the fixed substrate including a first surface on a side of the diffusion hologram facing the light-emitting display and a second surface on an opposite side of the diffusion hologram, wherein the diffusion hologram is a transmission diffusion hologram, and the display image transmission-wise diffracted by the diffusion hologram is reflected on the second surface of the fixed substrate for visual recognition. 2. The holographic display device according to claim 1, wherein the fixed substrate is a window glass of a vehicle. 3. The holographic display device according to claim 2, wherein a visible light transmittance is at least 70% when the transmission diffusion hologram is disposed on the fixed substrate. 4. The holographic display device according to claim 1, wherein the fixed substrate is a glass of a show window. 5. The holographic display device according to claim 4, further comprising a transparent substrate having a non-reflection coating applied to a side of the transmission diffusion hologram facing the first surface of the substrate. 6. The holographic display device according to claim 4, further comprising a high-reflection coating applied to the glass of a show window. 7. The holographic display device according to claim 1, wherein the hologram is a volume phase hologram and is recorded on an acrylic photopolymer. 8. The holographic display device according to claim 1, wherein the light-emitting display is a liquid crystal display element.