Hologram screen and a method of producing the same
First Claim
1. A hologram screen for reproducing an image based on an output light obtained by scattering and diffusing an image light from an image projector, characterized in that;
- when a white light is used as the image light and projected on the hologram screen; and
when a distance between two points at optional two points A and B on a surface of the hologram screen is given by 20 cm or less, and a value of the CIE 1976 chromaticity coordinate (u′
, v′
) at the point A is given by (u′
A, v′
A) and the value of the CIE 1976 chromaticity coordinate (u′
, v′
) at the point B is given by (u′
B, v′
B);
the output light, which is output perpendicularly from the surface of the hologram screen, has a color distribution in which a color difference Δ
u′
v′
between two points A and B is derived from the following formula (1) and given by 0.06 or less, where, the formula (1) is expressed by,
Δ
u′
v′
=[(u′
A−
u′
B)2+(v′
A−
v′
B)2]1/2
(1).
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Abstract
In a hologram screen for reproducing an image based on an output light obtained by scattering and diffusing an image light from an image projector, when a white light (image light) is projected on the hologram screen; and when a distance between two points at optional two points A and B on a surface of the hologram screen is given by 20 cm or less, and a value of the CIE 1976 chromaticity coordinate (u′, v′) at the point A is given by (u′A, v′A) and the value of the CIE 1976 chromaticity coordinate (u′, v′) at the point B is given by (u′B, v′B); the output light perpendicularly from the surface of the hologram screen has a color distribution in which a color difference Δu′v′between two points A and B is derived from the following formula (1) and given by 0.06 or less, where, the formula (1) is expressed by,
Δu′v′=[(u′A−u′B)2+(v′A−v′B)2]1/2 (1)
Further, the output light, which is output to a viewpoint defined by the following formula (2) from the surface of the hologram screen, has the color distribution in which a color difference Δu′v′ between two points A and B is derived from the above formula (1) and given by 0.01 or less, where, the formula (2) is expressed by,
H/2L=0.1 (2)
in the formula (2), L is a distance between the viewpoint and a center of the hologram screen, and H is a length of the hologram screen in the direction of the height.
94 Citations
3 Claims
-
1. A hologram screen for reproducing an image based on an output light obtained by scattering and diffusing an image light from an image projector, characterized in that;
-
when a white light is used as the image light and projected on the hologram screen; and
when a distance between two points at optional two points A and B on a surface of the hologram screen is given by 20 cm or less, and a value of the CIE 1976 chromaticity coordinate (u′
, v′
) at the point A is given by (u′
A, v′
A) and the value of the CIE 1976 chromaticity coordinate (u′
, v′
) at the point B is given by (u′
B, v′
B);
the output light, which is output perpendicularly from the surface of the hologram screen, has a color distribution in which a color difference Δ
u′
v′
between two points A and B is derived from the following formula (1) and given by 0.06 or less, where, the formula (1) is expressed by,
Δ
u′
v′
=[(u′
A−
u′
B)2+(v′
A−
v′
B)2]1/2
(1). - View Dependent Claims (3)
-
-
2. A hologram screen for reproducing an image based on an output light obtained by scattering and diffusing an image light from an image projector, characterized in that;
-
when a white light is used as the image light and projected on the hologram screen; and
when a distance between two points at optional two points A and B on a surface of the hologram screen is given by 20 cm or less, and a value of the CIE 1976 chromaticity coordinate (u′
, v′
) at the point A is given by (u′
A, v′
A) and the value of the CIE 1976 chromaticity coordinate (u′
, v′
) at the point B is given by (u′
B, v′
B);
the output light, which is output to a viewpoint defined by the following formula (2) from the surface of the hologram screen, has a color distribution in which a color difference Δ
u′
v′
between two points A and B is derived from the following formula (1) and given by 0.01 or less, where, the formula (1) is expressed by,
Δ
u′
v′
=[(u′
A−
u′
B)2+(v′
A−
v′
B)2]1/2
(1)and, where, the formula (2) is expressed by,
H/2L=0.1
(2)in the formula (2), L is a distance between the viewpoint and a center of the hologram screen, and H is a length of the hologram screen at the direction of the height.
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Specification
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- Resources
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Current AssigneeDENSO Corporation
-
Original AssigneeDENSO Corporation
-
InventorsTakada, Kenichiro
-
Primary Examiner(s)BOUTSIKARIS, LEONIDAS
-
Application NumberUS10/868,618Publication NumberTime in Patent Office315 DaysField of Search359/1, 359/15, 359/16, 359/35, 359/599US Class Current359/15CPC Class CodesG02B 2027/0118 comprising devices for impr...G02B 27/0103 comprising holographic elem...G02B 5/32 Holograms used as optical e...
