DISPLAY APPARATUS, HOLOGRAM REPRODUCTION APPARATUS AND APPARATUS UTILIZING HOLOGRAM

Abstract

The invention is to provide a novel display apparatus. The display apparatus includes a display device including a layer constructed by including an alkali halide or an alkali earth halide of which optical characteristics are changed by a laser light irradiation of a first wavelength region equal to or larger than 190 nm but less than 380 nm; a first light source for emitting a laser light of the first wavelength region, in order to write display data in the display device; and a second light source for irradiating the display device in which the display data are written, with a light of a second wavelength region of from 380 to 800 nm.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic view illustrating the present invention.

FIG. 2 is a schematic view illustrating a mode for displaying holographic interference fringes in the apparatus illustrated in FIG. 1.

FIG. 3 is a schematic view illustrating a mode of hologram reproduction in the apparatus illustrated in FIG. 1.

FIGS. 4A and 4B are views illustrating a coloring principle, respectively in structure and in energy, of a substance having a color center, to be employed in a display surface in the apparatus illustrated in FIG. 1.

FIG. 5 is a schematic view illustrating a mode for displaying volume hologram interference fringes in the volume hologram reproduction of the present invention.

FIG. 6 is a graph, illustrating transmission spectra in comparative manner before and after an ultraviolet laser light irradiation, of potassium bromide employed in a display surface in Example 1 of the present invention.

FIG. 7 is a graph, illustrating a transmission spectrum after an ultraviolet laser light irradiation, of NaBr employed in the display surface in Example 5 of the present invention.

FIG. 8 is a graph, illustrating transmission spectra after an electron beam irradiation, of rubidium chloride, potassium chloride and potassium fluoride, employed in a display surface in Example 7 of the present invention.

FIG. 9 is a schematic view illustrating a mode of forming a color center, utilizing a two-beam interfered exposure of a prior technology.

FIG. 10 is a view, illustrating reflective spectra after an ultraviolet laser light irradiation, of rubidium chloride, sodium bromide and potassium fluoride, employed in a volume hologram reproduction of the present invention.

FIG. 11 is a schematic view illustrating a display apparatus of an exemplary embodiment.

Claims

1. A display apparatus comprising: a display device including a layer constructed by including an alkali halide or an alkali earth halide of which optical characteristics are changed by a laser light irradiation of a first wavelength region equal to or larger than 190 nm but less than 380 nm;a first light source for emitting a laser light of the first wavelength region, in order to write display data in the display device; anda second light source for irradiating the display device in which the display data are written, with a light of a second wavelength region of from 380 to 800 nm.

2. The display apparatus according to claim 1, wherein the display device comprises the layer in plural units, containing materials having light absorption peak wavelengths which are different each other.

3. The display apparatus according to claim 1, wherein the first light source and the second light source include a single light source variable in wavelength.

4. The display apparatus according to claim 1, wherein the display data are holographic data.

5. A hologram reproduction apparatus comprising: a display device constructed by including an alkali halide or an alkali earth halide of which optical characteristics are changed by a laser light irradiation of a first wavelength region equal to or larger than 190 nm but less than 380 nm;a writing unit which writes holographic interference fringes in the display device, by a laser light irradiation of the first wavelength region; anda unit which irradiates the holographic interference fringes with a reading light of a second wavelength region of from 380 to 800 nm thereby reproducing a holographic stereo image.

6. The hologram reproduction apparatus according to claim 5, wherein the holographic interference fringes are written as dot data based on holographic data in the display device.

7. The hologram reproduction apparatus according to claim 5, further comprising: an erasing unit for erasing the holographic interference fringes;wherein a continuous reproduction of holographic stereo images is executed by repeating the writing of the holographic interference fringes by the writing unit, the reproduction of the holographic stereo image by the reproduction unit, and the erasure of the holographic interference fringes by the erasing unit.

8. The hologram reproduction apparatus according to claim 7, wherein the erasing unit erases the holographic interference fringes by an action of a laser light irradiation, an electromagnetic wave or a heat.

9. The hologram reproduction apparatus according to claim 8, wherein the laser light irradiation has a wavelength equal to or larger than 700 nm.

10. The hologram reproduction apparatus according to claim 5, wherein the irradiation of the reading light of the second wavelength region is executed from a same side as the laser light irradiation of the first wavelength region to the display device.

11. The hologram reproduction apparatus according to claim 5, wherein the writing unit forms the holographic interference fringes on an imaginary plane defined in a direction of depth of the display device.

12. The hologram reproduction apparatus according to claim 5, wherein a stereo display and a non-stereo display are switched by switching a pixel size in the dot data.

13. A hologram reproduction apparatus comprising: a display device containing first, second and third laminated layers constructed by including an alkali halide or an alkali earth halide of which optical characteristics are changed by a laser light irradiation of a first wavelength region equal to or larger than 190 nm but less than 380 nm;wherein the first, second and third layers have absorption peak wavelengths different with one another in a state where the optical characteristics are changed by the laser light irradiation of the first wavelength region;wherein the absorption peak wavelengths of the first, second and third layers are respectively from 380 to 500 nm, from 500 to 600 nm and from 600 to 800 nm;a writing unit for writing holographic interference fringes in the display device by the laser light irradiation of the first wavelength region; anda reproduction unit for reproducing a holographic stereo image by irradiating the display device, in which the holographic interference fringes are written, with a reading light.

14. The hologram reproduction apparatus according to claim 13, wherein the holographic interference fringes are written as dot data based on holographic data in the display device.

15. The hologram reproduction apparatus according to claim 13, wherein three reading lights respectively having a peak wavelength, selected within a second wavelength region of from 380 to 800 nm, of from 380 to 500 nm, a peak wavelength of from 500 to 600 nm and a peak wavelength of from 600 to 800 nm are used on the display device in which the holographic interference fringes are written, to reproduce a holographic stereo image.

16. The hologram reproduction apparatus according to claim 13, further comprising: an erasing unit for erasing the holographic interference fringes;wherein a continuous reproduction of holographic stereo images is executed by repeating the writing of the holographic interference fringes by the writing unit, the reproduction of the holographic stereo image by the reproduction unit, and the erasure of the holographic interference fringes by the erasing unit.

17. The hologram reproduction apparatus according to claim 16, wherein the erasing unit erases the holographic interference fringes by an action of a laser light irradiation, an electromagnetic wave or a heat.

18. The hologram reproduction apparatus according to claim 17, wherein the laser light irradiation has a wavelength equal to or larger than 700 nm.

19. The hologram reproduction apparatus according to claim 13, wherein a stereo display and a non-stereo display are switched by switching a pixel size in the dot data.

20. An apparatus utilizing a hologram comprising: a volume hologram recording medium constructed by including an alkali halide or an alkali earth halide of which optical characteristics are changed by a laser light irradiation of a first wavelength region equal to or larger than 190 nm but less than 380 nm;a first light source for irradiating the volume hologram recording medium with a laser light of the first wavelength region; anda second light source for irradiating the volume hologram recording medium with a light of a second wavelength region of from 380 to 800 nm;wherein the volume hologram recording medium and the first light source are moved in a relative three-dimensional scan to form, on the volume hologram recording medium, volume holographic interference fringes based on bit data.

21. The apparatus utilizing the hologram according to claim 20, wherein the volume hologram recording medium includes plural layers containing an alkali halide or an alkali earth halide, and the plural layers are changed in the optical characteristics by a laser light irradiation of the first wavelength region and have respectively different absorption peak wavelengths in a state where the optical characteristics are changed.