Hologram screen and hologram display

A hologram display comprising:

• a hologram screen for displaying an image by diffracting and scattering image light;
• and
• a projection apparatus for projecting the image light onto the hologram screen, wherein
• the hologram screen comprises:
• a first light scattering device, placed on an image projection apparatus side of a hologram device in the hologram screen, for scattering light incident from a specific angle range;
• and
• a second light scattering device, placed between the hologram device and the first light scattering device or on the image projection apparatus side of the first light scattering device, for scattering light incident from a specific angle range which is substantially different from the specific angle range of the first light scattering device, wherein
• the specific angle range of the first or second light scattering device is set so that an incidence angle range within which the image light is incident on the hologram screen contains an incidence angle at which the image light is incident on the hologram screen.

A hologram screen for displaying an image by diffracting and scattering image light projected from an image projection apparatus, comprising:

• an upward/downward light scattering device placed on an image projection apparatus side of a hologram device in the hologram screen, and oriented so as to scatter light incident from at least one upward/downward specific angle range spreading obliquely upward or obliquely downward;
• and
• a leftward/rightward light scattering device placed between the hologram device and the upward/downward light scattering device or on the image projection apparatus side of the upward/downward light scattering device, and oriented so as to scatter light incident from a leftward/rightward specific angle range spreading obliquely leftward and obliquely rightward, wherein
• the upward/downward specific angle range contains an incidence angle at which the image light is incident on the hologram screen.

A hologram display comprising:

• a hologram screen for displaying an image by diffracting and scattering image light;
• and
• a projection apparatus for projecting the image light onto the hologram screen, wherein the hologram screen comprises:
• an upward/downward light scattering device placed on an image projection apparatus side of a hologram device in the hologram screen, and oriented so as to scatter light incident from at least one upward/downward specific angle range spreading obliquely upward or obliquely downward;
• and
• a leftward/rightward light scattering device placed between the hologram device and the upward/downward light scattering device or on the image projection apparatus side of the upward/downward light scattering device, and oriented so as to scatter light incident from a leftward/rightward specific angle range spreading obliquely leftward and obliquely rightward, wherein
• the upward/downward specific angle range contains an incidence angle at which the image light is incident on the hologram screen.

A hologram screen for displaying an image by diffracting and scattering image light projected from an image projection apparatus, comprising:

• an upward/downward light scattering device placed on an image projection apparatus side of a hologram device in the hologram screen, and oriented so as to scatter light incident from at least one upward/downward specific angle range spreading obliquely upward or obliquely downward;
• and
• a leftward/rightward light scattering device placed on an image observer side of the hologram device, and oriented so as to scatter light incident from a leftward/rightward specific angle range spreading obliquely leftward and obliquely rightward, wherein
• the upward/downward specific angle range contains an incidence angle at which the image light is incident on the hologram device.

A hologram display comprising:

• a hologram screen for displaying an image by diffracting and scattering image light;
• and
• a projection apparatus for projecting the image light onto the hologram screen, wherein the hologram screen comprises:
• an upward/downward light scattering device placed on an image projection apparatus side of a hologram device in the hologram screen, and oriented so as to scatter light incident from at least one upward/downward specific angle range spreading obliquely upward or obliquely downward;
• and
• a leftward/rightward light scattering device placed on an image observer side of the hologram device, and oriented so as to scatter light incident from a leftward/rightward specific angle range spreading obliquely leftward and obliquely rightward, wherein
• the upward/downward specific angle range contains an incidence angle at which the image light is incident on the hologram device.