Fluorescent screen and image display device provided with same
A fluorescent screen includes phosphor regions 1 -R, 1 -G, diffusion region 1 -B and reflecting means 10 formed on a region that includes phosphor regions 1 -R and 1 -G and diffusion region 1 -B. Reflecting means 10 includes fluorescent light reflecting layer 11 , phase difference layer 12 , and polarizing layer 13 deposited in that order. Fluorescent light reflecting layer 11 transmits excited light 4 and reflects fluorescent light from phosphor regions 1 -R and 1 -G. Polarizing layer 13 both transmits excited light 4 and, of diffused light of the excited light ( 4 ) that was entered from diffusion region 1 _B through Phase difference layer 12 , transmits TM polarized light and reflects TE polarized light.
1. A fluorescent screen comprising:
phosphor regions that contain fluorescent material that absorbs first linearly polarized light and emits fluorescent light;
a diffusion region that diffuses said first linearly polarized light; and
a polarizing layer that is arranged on the side of said diffusion regions into which said first linearly polarized light is entered,
wherein said polarizing layer transmits said first linearly polarized light and reflects second linearly polarized light whose vibrational direction differs from that of said first linearly polarized light.
2. The fluorescent screen as set forth in claim 1 , further comprising a fluorescent light reflecting layer that transmits said first linearly polarized light to irradiate said phosphor regions, and that reflects, toward said phosphor region side, said fluorescent light that was emitted in said phosphor regions by the irradiation of said first linearly polarized light.
3. The fluorescent screen as set forth in claim 2 , wherein said fluorescent light reflecting layer is formed on a region that includes said phosphor regions and diffusion region, and said polarizing layer is formed on said fluorescent light reflecting layer.
4. The fluorescent screen as set forth in claim 2 , wherein said polarizing layer is formed on said diffusion region and said fluorescent light reflecting layer is formed on said phosphor regions and regions that include the polarizing layer.
5. The fluorescent screen as set forth in claim 4 , wherein stacking portions of said polarizing layer and diffusion region and said phosphor regions are partitioned by black stripes that absorb said excited light and fluorescent light.
6. The fluorescent screen as set forth in claim 2 , wherein said fluorescent light reflecting layer is formed on said phosphor regions, and said polarizing layer is formed on said diffusion region.
7. The fluorescent screen as set forth in claim 6 , wherein stacking portions of said diffusion region and polarizing layer and stacking portions of said phosphor regions and fluorescent light reflecting layer are partitioned by black stripes that absorb said excited light and fluorescent light.
8. The fluorescent screen as set forth in claim 2 , wherein said polarizing layer is formed on a region that includes said phosphor regions and diffusion region, and said fluorescent light reflecting layer is formed on said polarizing layer.
9. The fluorescent screen as set forth in claim 1 , further comprising a phase difference layer that is provided between said diffusion region and said polarizing layer, that converts each of said first and second linearly polarized light that is entered from said polarizing layer side to circularly polarized light, and that converts circularly polarized light that is entered from said diffusion region side to said first or second linearly polarized light according to the direction of rotation.
10. An image display device comprising:
the fluorescent screen as set forth in claim 1 ;
an excitation light source that supplies first linearly polarized light; and
a scanning unit that scans one surface of said fluorescent screen with said first linearly polarized light that is supplied from said excitation light source.