Screen and production display apparatus using the same
First Claim
Patent Images
1. A generally flat screen for receiving an image-forming light projected by a projector so as to provide an observable display to a viewer, comprising:
- a gain controller for changing a ratio (gain) of luminance at a light-output face of the screen to illuminance at a light-incident face of the screen so that a gain of generally the entire screen is changed, thereby changing an observable area of the screen, said gain controller controlling the gain by controlling the degree of diffusion of light;
said gain controller controlling the gain within a continuous range, and the observable area is obtained by an arbitrary gain within said continuous range.
0 Assignments
0 Petitions
Accused Products
Abstract
A screen has a screen main body, a power supply and a voltage regulator. The screen main body has a Fresnel lens, a polymer dispersed liquid crystal unit and a lenticular lens. The liquid crystal unit includes a polymer dispersed liquid crystal and a pair of transparent electrodes which sandwich the polymer dispersed liquid crystal. By operating the voltage regulator, a voltage applied to the electrodes is adjusted so that a gain of the liquid crystal is controlled.
30 Citations
27 Claims
-
1. A generally flat screen for receiving an image-forming light projected by a projector so as to provide an observable display to a viewer, comprising:
-
a gain controller for changing a ratio (gain) of luminance at a light-output face of the screen to illuminance at a light-incident face of the screen so that a gain of generally the entire screen is changed, thereby changing an observable area of the screen, said gain controller controlling the gain by controlling the degree of diffusion of light;
said gain controller controlling the gain within a continuous range, and the observable area is obtained by an arbitrary gain within said continuous range. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
a pair of transparent electrodes opposite to each other;
a scattering liquid crystal disposed between said pair of transparent electrodes; and
a voltage regulator for adjusting a voltage applied to said pair of transparent electrodes.
-
-
3. The screen as claimed in claim 2, further comprising:
-
a Fresnel lens at which an image-forming light is incident on the screen; and
a lenticular lens at which said image-forming light is output from the screen, wherein said gain controller is disposed between said lenticular lens and said Fresnel lens.
-
-
4. The screen as claimed in claim 2, further comprising:
-
a Fresnel lens at which said image-forming light is incident on the screen, wherein said gain controller is provided to face a surface of said Fresnel lens from which surface said image-forming light is output, and said scattering liquid crystal constituting a part of said gain controller having a lenticular lens surface on its face from which face said image-forming light is output.
-
-
5. The screen as claimed in claim 2, further comprising:
-
a Fresnel lens at which said image-forming light is incident on the screen; and
a transparent base which has a surface having discrete depressions, said surface facing said Fresnel lens, wherein said gain controller is provided on said surface of said transparent base which surface faces said Fresnel lens, and said scattering liquid crystal constituting a part of said gain controller having a lenticular lens surface on its face from which face the image-forming light is output.
-
-
6. The screen as claimed in claim 2, further comprising a reflecting layer for reflecting the image-forming light emitted by a projector,
wherein said gain controller is provided between said projector and said reflecting layer. -
7. The screen as claimed in claim 6, further comprising a brightness detector for detecting brightness of the surroundings, said detector being coupled to said gain controller,
wherein an output from said brightness detector is used to operate said gain controller. -
8. The screen as claimed in claim 2, further comprising a brightness detector for detecting brightness of the surroundings, said detector being coupled to said gain controller,
wherein an output from said brightness detector is used to operate said gain controller. -
9. The screen as claimed in claim 1, further comprising a brightness detector for detecting brightness of the surroundings, said detector being coupled to said gain controller
wherein an output from said brightness detector is used to operate said gain controller. -
10. The screen as claimed in claim 2, wherein a liquid crystal layer is sandwiched between a light-transmissive base having a Fresnel lens surface and a light-transmissive base having a lenticular surface, the liquid crystal layer being provided with a Fresnel lens surface at which light enters and a lenticular lens surface from which light exits.
-
11. The screen as claimed in claim 1, wherein by controlling the gain, the screen provides optimum observation conditions for various observation requirements including one for a single viewer and one for multiple viewers.
-
12. A projection display apparatus comprising:
-
a body;
a projector provided in said body so as to project an image-forming light; and
a generally flat screen attached to said body so as to receive the image-forming light projected by said projector and provide an observable image to a viewer, said screen comprising a gain controller for changing a ratio (gain) of luminance at a light-outgoing face of the screen to illuminance at a light-incident face of the screen so that a gain of generally the entire screen is changed, thereby changing an observable area of the screen, said gain controller controlling the gain by controlling the degree of diffusion of light;
said gain controller controlling the gain within a continuous range, and the observable area is obtained by an arbitrary gain within said continuous range. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
wherein said gain controller of said screen comprises: a pair of transparent electrodes opposite to each other;
a scattering liquid crystal disposed between said pair of transparent electrodes; and
a voltage regulator for adjusting a voltage applied to said pair of transparent electrodes.
-
-
14. The projection display apparatus as claimed in claim 13, wherein said screen further comprises:
-
a Fresnel lens at which an image-forming light is incident on said screen; and
a lenticular lens at which said image-forming light is output from said screen, and said gain controller is disposed between said lenticular lens and said Fresnel lens.
-
-
15. The projection display apparatus as claimed in claim 13, wherein said screen further comprises:
-
a Fresnel lens at which an image-forming light is incident on said screen, and said gain controller is provided to face a surface of said Fresnel lens from which surface said image-forming light is output, and said scattering liquid crystal constituting a part of said gain controller having a lenticular lens surface on its face from which face said image-forming light is output.
-
-
16. The projection display apparatus as claimed in claim 13, wherein said screen further comprises:
-
a Fresnel lens at which an image-forming light is incident on said screen; and
a transparent base which has a surface having discrete depressions, said surface facing said Fresnel lens, and said gain controller is provided on said surface of said transparent base which surface faces said Fresnel lens, and said scattering liquid crystal constituting a part of said gain controller having a lenticular lens surface on its face from which face said image-forming light is output.
-
-
17. The projection display apparatus as claimed in claim 13, wherein said screen further comprises a brightness detector for detecting brightness of the surroundings, and
an output from said brightness detector is used to operate said gain controller. -
18. The projection display apparatus as claimed in claim 12, wherein said screen further comprises a brightness detector for detecting brightness of the surroundings, and
an output from said brightness detector used to operate said gain controller. -
19. The projection display apparatus as claimed in claim 12, wherein said projector comprises:
-
a light source;
a liquid crystal panel; and
a projection lens.
-
-
20. The projection display apparatus as claimed in claim 12, wherein by controlling the gain, the screen provides optimum observation conditions for various observation requirements including one for a single viewer and one for multiple viewers.
-
21. A projection display apparatus comprising:
-
a body;
a projector provided in said body so as to project an image-forming light; and
a generally flat screen for receiving the image-forming light projected by said projector so as to provide an observable image to a viewer, said screen having a gain controller for changing a reflecting capability of the screen so that a gain of generally the entire screen is changed, thereby changing an observable area of the screen, said gain controller controlling the gain by controlling the degree of diffusion of light, wherein said screen further comprises a reflecting layer for reflecting the image-forming light emitted by said projector, and said gain controller is provided between said projector and said reflecting layer and said gain controller controlling the gain within a continuous range, the observable area being obtained by an arbitrary gain within said continuous range. - View Dependent Claims (22, 23, 24)
an output from said brightness detector is used to operate said gain controller. -
23. The projection display apparatus as claimed in claim 21, wherein said projector comprises:
-
a light source;
a liquid crystal panel; and
a projection lens.
-
-
24. The projection display apparatus as claimed in claim 21, wherein by controlling the gain, the screen provides optimum observation conditions for various observation requirements including one for a single viewer and one for multiple viewers.
-
-
25. A display method in a rear-projection apparatus having a projector and a generally flat screen for receiving an image-forming light projected by the projector so as to provide an observable display to a viewer, wherein the screen has a gain controller for changing a ratio (gain) of luminance at a light-output face of the screen to illuminance at a light-incident face of the screen so that a gain of generally the entire screen is changed, thereby changing an observable area of the screen, the gain controller controlling the gain within a continuous range, the observable area being obtained by an arbitrary gain within the continuous range, said display method comprising the step of:
adjusting a gain of the screen by using said gain controller, wherein said gain controller controls the gain by controlling the degree of diffusion of light. - View Dependent Claims (26, 27)
Specification