Screen and projection image display system
View Patent ↗A screen that diffuses and reflects image light projected by a projector, includes an uneven half mirror structure body which includes a first transparent substrate and a semitransparent reflective layer, and a second transparent substrate bonded to the uneven half mirror structure body on the surface of the uneven shape with a transparent material. The first transparent substrate has an uneven shape on one surface of the first transparent substrate. The semitransparent reflective layer is provided on the surface of the uneven shape and configured to reflect a part of light and transmit the remaining light. One of the first transparent substrate and the second transparent substrate disposed closer to a projection side than the semitransparent reflective layer is made of a material exhibiting birefringence of less than or equal to 500 nm.
1. A screen that diffuses and reflects image light projected by a projector to display an image, the screen comprising:
an uneven half mirror structure body including a first transparent substrate and a semitransparent reflective layer, the first transparent substrate having an uneven shape on one surface of the first transparent substrate, the semitransparent reflective layer being provided on the surface of the uneven shape and configured to reflect a part of light and transmit the remaining light; and
a second transparent substrate bonded to the uneven half mirror structure body on the surface of the uneven shape with a transparent material,
wherein:
one of the first transparent substrate and the second transparent substrate disposed closer to a projection side than the semitransparent reflective layer is made of a material exhibiting birefringence of less than or equal to 500 nm;
the first transparent substrate is made of a material exhibiting birefringence of greater than 500 nm,
the second transparent substrate is made of a material exhibiting birefringence of less than or equal to 500 nm,
the first transparent substrate is bonded to the second transparent substrate with the transparent material, and
the image light from the projector is projected onto the second transparent substrate.
2. The screen according to claim 1 , wherein
the second transparent substrate is a plate-shaped glass component.
3. The screen according to claim 1 , wherein the first transparent substrate is made of any one of acrylic, polycarbonate and triacetyl cellulose.
4. The screen according to claim 1 , wherein the second transparent substrate is made of any one of acrylic, polycarbonate and triacetyl cellulose.
5. A projection image display system comprising:
a projector that projects image light; and
a screen according to claim 1 onto which the image light is projected.
6. The projection image display system according to claim 5 , wherein the projector outputs at least one of three primary colors of light as polarized light.
7. The projection image display system according to claim 5 , wherein the projector includes a light emitting element that emits blue light, a phosphor that converts the blue light into yellow light, and a color filter that separates red light and green light from the yellow light.
8. The projection image display system according to claim 5 , wherein the projector includes a blue laser diode that outputs blue light and a red laser diode that outputs red light, as light sources, and a phosphor that generates green light from the blue light.
9. The projection image display system according to claim 5 , wherein the projector includes a blue laser diode that outputs blue light, a red laser diode that outputs red light, and a green laser diode that outputs green light as light sources.
10. The projection image display system according to claim 5 , wherein the projector includes a liquid crystal panel as a spatial modulation element, and emits each of three primary colors as polarized light.