WO2012176585A1 - 蛍光スクリーンおよびそれを備えた画像表示装置 - Google Patents
蛍光スクリーンおよびそれを備えた画像表示装置 Download PDFInfo
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- WO2012176585A1 WO2012176585A1 PCT/JP2012/063676 JP2012063676W WO2012176585A1 WO 2012176585 A1 WO2012176585 A1 WO 2012176585A1 JP 2012063676 W JP2012063676 W JP 2012063676W WO 2012176585 A1 WO2012176585 A1 WO 2012176585A1
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- light
- polarized light
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- phosphor
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3083—Birefringent or phase retarding elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
- G02B27/283—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising used for beam splitting or combining
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
- F21V9/14—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters for producing polarised light
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/54—Accessories
- G03B21/56—Projection screens
- G03B21/567—Projection screens for colour projection
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/54—Accessories
- G03B21/56—Projection screens
- G03B21/60—Projection screens characterised by the nature of the surface
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/54—Accessories
- G03B21/56—Projection screens
- G03B21/60—Projection screens characterised by the nature of the surface
- G03B21/604—Polarised screens
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3129—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] scanning a light beam on the display screen
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B2207/00—Coding scheme for general features or characteristics of optical elements and systems of subclass G02B, but not including elements and systems which would be classified in G02B6/00 and subgroups
- G02B2207/113—Fluorescence
Definitions
- a phosphor region including a phosphor that absorbs excitation light and generates fluorescence (visible light), and a diffusion region that receives excitation light and emits diffused light are periodically arranged in the in-plane direction.
- the present invention relates to a fluorescent screen and an image display device including the same.
- Patent Document 1 describes a display device that includes a fluorescent screen and means for scanning blue excitation light to form an image on the fluorescent screen.
- the phosphor screen includes a first phosphor region that includes a phosphor that absorbs excitation light and generates red fluorescence, and a second phosphor region that includes a phosphor that absorbs excitation light and generates green fluorescence. And non-phosphor regions that diffuse excitation light and emit blue diffused light, and these regions are periodically arranged in the in-plane direction.
- excitation light is irradiated from one surface (back surface) side of the phosphor screen, and an image is observed from the other surface (front surface) side of the phosphor screen.
- the contrast ratio or color depends on the viewing direction (angle) of the display image.
- the so-called viewing angle dependency problem arises.
- the phosphor that has absorbed the excitation light emits the fluorescence radially, and the emitted fluorescence diffuses evenly in all directions. Such diffusion of fluorescence in all directions is called isotropic diffusion. Further, the non-phosphor region is also configured to uniformly diffuse blue diffused light in all directions.
- each of the first and second phosphor regions and the non-phosphor region By configuring each of the first and second phosphor regions and the non-phosphor region so that isotropic diffusion occurs, the spatial angle distribution (viewing angle) of the light emitted from each region is increased. And the problem of viewing angle dependency can be solved.
- the first and second phosphor regions and the non-phosphor region are configured to cause isotropic diffusion, diffused light is emitted in both directions on the front surface side and the back surface side in each region.
- the diffused light emitted to the back side does not contribute to the formation of the image, so that the light use efficiency is lowered.
- a reflective layer that transmits blue excitation light and reflects light of other colors (including red and green fluorescence) is provided on the back surface of the fluorescent screen. .
- the reflective layer is a wavelength-selective reflective layer made of, for example, a dielectric multilayer film.
- the red and green fluorescence emitted from the first and second phosphor regions to the back side is reflected in the direction of the front side by the reflective layer. Thereby, the light utilization efficiency of fluorescence can be improved.
- red and green fluorescence emitted from the first and second phosphor regions to the back surface side is reflected in the direction of the front surface side by the reflective layer, but is not fluorescent.
- Blue diffused light emitted from the body region to the back side is transmitted through the reflective layer.
- the blue diffused light transmitted through the reflective layer does not contribute to the formation of an image, so that the light use efficiency of the blue light is reduced.
- An object of the present invention is to solve the above-described problems and provide a fluorescent screen and an image display device using the same that can improve the light utilization efficiency not only for fluorescence but also for diffused light of excitation light.
- the fluorescent screen of the present invention comprises: A phosphor screen comprising a phosphor region containing a phosphor that absorbs first linearly polarized light and generates fluorescence, and a diffusion region that diffuses the first linearly polarized light, A polarizing layer disposed on the side where the first linearly polarized light is incident on the diffusion region; The polarizing layer transmits the first linearly polarized light and reflects the second linearly polarized light having a vibration direction different from that of the first linearly polarized light.
- the image display device of the present invention is The above fluorescent screen; An excitation light source that outputs first linearly polarized light; A scanning unit that scans one surface of the fluorescent screen with the first linearly polarized light output from the excitation light source.
- FIG. 1 is a cross-sectional view schematically showing a partial cross-sectional structure of the fluorescent screen according to the first embodiment of the present invention.
- the fluorescent screen is used in a rear projection type image display device, and includes a base material 2, phosphor regions 1_R, 1_G, a diffusion region 1_B, a black stripe 1_BK, and reflecting means 10. .
- the substrate 2 has a spectral transmission characteristic that transmits light in a wavelength range including at least red, green, and blue.
- the phosphor regions 1_R, 1_G, the diffusion region 1_B, and the black stripe 1_BK are formed on one surface of the substrate 2.
- the black stripe 1_BK is made of an absorbing material that absorbs the fluorescence and excitation light 4 of each color emitted from the phosphor regions 1_R and 1_G.
- the phosphor regions 1_R, 1_G and the diffusion region 1_B are periodically arranged in the in-plane direction, and black stripes 1_BK are formed in regions between the regions.
- the phosphor regions 1_R, 1_G and the diffusion region 1_B are regions partitioned in a stripe shape or a matrix shape by the black stripe 1_BK.
- the phosphor region 1_R includes a phosphor that absorbs the blue excitation light 4 and emits red fluorescence.
- the phosphor region 1_G includes a phosphor that absorbs the excitation light 4 and emits green fluorescence. In the phosphor regions 1_R and 1_G, the phosphor that has absorbed the excitation light 4 emits the fluorescence radially, and the emitted fluorescence is evenly diffused in all directions (isotropic diffusion).
- the diffusion region 1_B is a region that diffuses the excitation light 4 and emits blue diffused light, and holds the polarization of the incident light.
- the diffusion region 1 ⁇ / b> _B that holds such polarized light can be configured by ground glass or a holographic optical element.
- a diffusion region that retains polarized light by applying acrylic resin or the like on a base material, heat-curing or photo-curing, and then grinding the surface (for example, matte processing in one direction or vertical and horizontal directions) Can be obtained.
- a special hologram pattern (a collection of fine concavo-convex groove surfaces) is formed on the surface by nanoimprinting or the like, thereby obtaining a diffusion region that holds polarized light.
- the blue diffused light diffuses evenly in all directions.
- the spatial angle distribution (viewing angle) of diffused light emitted from the diffusion region 1_B substantially matches the spatial angle distribution (viewing angle) of fluorescence emitted from the phosphor regions 1_R and 1_G.
- the phosphor regions 1_R, 1_G, and the diffusion region 1_B are periodically formed in a specific direction in a predetermined order.
- the reflecting means 10 is provided on the surface of the substrate 2 on which the phosphor regions 1_R, 1_G, the diffusion region 1_B, and the black stripe 1_BK are formed.
- the reflection means 10 includes a fluorescent reflection layer 11, a retardation layer 12 and a polarizing layer 13.
- the fluorescent reflection layer 11, the retardation layer 12, and the polarizing layer 13 are laminated in this order from the substrate 2 side.
- the fluorescent reflection layer 11 has a spectral transmission characteristic that transmits at least the blue excitation light 4 and reflects red and green fluorescence emitted from the phosphor regions 1_R and 1_G. Become.
- the dielectric multilayer film is obtained by alternately stacking at least two dielectric films having different refractive indexes, and the spectral transmission characteristics are determined by the film thickness and refractive index of each dielectric film.
- the phase difference layer 12 gives a predetermined phase difference between the first and second linearly polarized light vibrating in directions perpendicular to each other.
- the first linearly polarized light is TM (Transverse Magnetic Wave) polarized light or p-polarized light.
- the second linearly polarized light is TE (Transverse Electric Wave) polarized light or s-polarized light.
- the retardation layer 12 is made of, for example, a 1 / 4 ⁇ plate.
- ⁇ is the wavelength of the excitation light 4.
- the 1 ⁇ 4 ⁇ plate converts the first linearly polarized light (TM-polarized light or p-polarized light) and the second linearly polarized light (TE-polarized light or s-polarized light) incident from the polarizing layer 13 side into circularly polarized light, and diffuses them.
- the circularly polarized light incident from the region 1_B side is converted into the first linearly polarized light (TM polarized light or p polarized light) or the second linearly polarized light (TE polarized light or s polarized light) according to the rotation direction.
- the polarizing layer 13 transmits the first linearly polarized light (TM polarized light or p polarized light) and reflects the second linearly polarized light (TE polarized light or s polarized light) in the incident light.
- the thickness of the fluorescent reflecting layer 11 is in the range of 30 ⁇ m to 300 ⁇ m, and preferably in the range of 30 ⁇ m to 60 ⁇ m.
- the thickness of the retardation layer 12 is in the range of 30 ⁇ m to 300 ⁇ m, and preferably in the range of 50 ⁇ m to 100 ⁇ m.
- the thickness of the polarizing layer 13 is in the range of 15 ⁇ m to 500 ⁇ m, and preferably in the range of 100 ⁇ m to 200 ⁇ m.
- FIG. 2 is a schematic diagram for explaining the operation of the reflecting means 10 in the diffusion region 1_B.
- an arrow indicated by a broken line indicates circularly polarized light
- an arrow indicated by a solid line indicates linearly polarized light (first or second linearly polarized light).
- the excitation light 4 which is the first linearly polarized light (TM polarized light or p polarized light) is irradiated on the reflecting means 10 side surface of the fluorescent screen.
- the excitation light 4 sequentially passes through the polarizing layer 13, the retardation layer 12, and the fluorescent reflection layer 11. In the process in which the excitation light 4 transmitted through the polarizing layer 13 passes through the retardation layer 12, the excitation light 4 is converted from the first linearly polarized light to circularly polarized light. The circularly polarized excitation light 4 passes through the fluorescent reflection layer 11 as it is and enters the diffusion region 1_B.
- the circularly polarized excitation light 4 is diffused, and about 50% of the diffused light is emitted in the direction of the base material 2, and the remaining light is emitted to the fluorescent reflection layer 11 side.
- the diffused light (circularly polarized light) emitted from the diffusion region 1_B in the direction toward the fluorescent reflection layer 11 passes through the fluorescent reflection layer 11 and the retardation layer 12 in order, and then enters the polarizing layer 13.
- the diffused light In the process in which diffused light (circularly polarized light) transmitted through the fluorescent reflecting layer 11 passes through the retardation layer 12, the diffused light is converted from circularly polarized light to second linearly polarized light (TE polarized light or s polarized light).
- the polarizing layer 13 reflects the diffused light of the second linearly polarized light from the retardation layer 12 in the direction toward the retardation layer 12.
- the reflected light of the second linearly polarized light reflected by the polarizing layer 13 sequentially passes through the retardation layer 12 and the fluorescent reflection layer 11.
- the reflected light is converted from the second linearly polarized light to circularly polarized light.
- the circularly polarized reflected light passes through the fluorescent reflection layer 11 as it is and enters the diffusion region 1_B.
- the circularly polarized reflected light is diffused, and about 50% of the diffused light is emitted in the direction of the base material 2 side, and the remaining light is emitted to the fluorescent reflection layer 11 side.
- the circularly polarized reflected light incident on the diffusion region 1_B corresponds to about 25% of the circularly polarized excitation light 4 incident on the diffusion region 1_B.
- the diffused light (circularly polarized light) emitted from the diffusion region 1_B in the direction toward the fluorescent reflection layer 11 passes through the fluorescent reflection layer 11 and the retardation layer 12 in order, and then enters the polarizing layer 13.
- the diffused light In the process in which diffused light (circularly polarized light) transmitted through the fluorescent reflecting layer 11 passes through the retardation layer 12, the diffused light is converted from circularly polarized light to first linearly polarized light (TM polarized light or p polarized light).
- the polarizing layer 13 transmits the first linearly polarized diffused light from the retardation layer 12.
- the first linearly polarized diffused light transmitted through the polarizing layer 13 corresponds to about 25% of the circularly polarized excitation light 4 incident on the diffusion region 1_B.
- the diffused light of the excitation light 4 is emitted in both directions on the front surface side (base material 2 side) and the back surface side (fluorescent reflection layer 11 side). However, about 50% of the diffused light emitted to the back surface side is reflected by the reflecting means 10 toward the front surface side.
- T light extraction efficiency (light utilization efficiency), which is the ratio of light extracted from the surface side of the diffusion region 1_B as diffusion light in the excitation light 4, is T, T is given by the following equation.
- the light extraction efficiency T is
- the luminance of the blue diffused light observed from the surface side is about 1.times.
- the luminance not having the retardation layer 12 and the polarizing layer 13. Increases 5 times.
- the phosphor absorbs the circularly polarized excitation light 4 transmitted through the reflecting means 10 and emits fluorescence.
- the emitted fluorescent diffused light is emitted to the front side (base material 2 side) and the back side (fluorescent reflective layer 11 side), but most of the fluorescent diffused light emitted to the back side is fluorescent reflective layer 11. Is reflected in the direction of the surface side. Therefore, most of the fluorescent diffused light can be extracted from the surface side.
- red and green fluorescent diffused light emitted from the phosphor regions 1_R and 1_G can be extracted from the surface side, and about the excitation light 4 incident on the diffused region 1_B. Since 75% of light can be extracted as diffused light from the surface side, a high-luminance image can be provided.
- the phosphor screen of the present embodiment is an example of the present invention, and the configuration thereof can be modified by those skilled in the art without departing from the spirit of the invention.
- the reflecting means 10 may have a structure in which the retardation layer 12, the polarizing layer 13, and the fluorescent reflecting layer 11 are sequentially laminated from the substrate 2 side.
- the phosphor region formed on the substrate 2 is not limited to the phosphor region that emits red and green fluorescence.
- a region that emits fluorescence of another color may be added, or may be configured only by a region that emits fluorescence of a specific color.
- FIG. 3 is a cross-sectional view schematically showing a partial cross-sectional structure of the fluorescent screen according to the second embodiment of the present invention.
- the fluorescent screen of this embodiment is the same as that of the first embodiment except that a part of the reflecting means 10 is different.
- the reflecting means 10 has a fluorescent reflecting layer 11, a retardation layer 12a, and a polarizing layer 13a.
- the fluorescent reflection layer 11 is the same as that of the first embodiment.
- the retardation layer 12a is formed on the diffusion region 1_B, and the polarizing layer 13a is formed on the retardation layer 12a.
- the diffusion region 1_B, the retardation layer 12a, and the polarizing layer 13a are laminated in this order from the substrate 2 side in the region partitioned by the black stripe 1_BK.
- the thickness of the entire stacked portion is substantially the same as the thickness of the phosphor regions 1_R and 1_G.
- the fluorescent reflection layer 11 is provided on the entire surface on which the diffusion region 1_B, the laminated layer of the retardation layer 12a and the polarizing layer 13a, the phosphor regions 1_R, 1_G, and the black matrix 1_BK are formed.
- FIG. 4 is a schematic diagram for explaining the operation of the reflecting means 10 in the diffusion region 1_B.
- an arrow indicated by a broken line indicates circularly polarized light
- an arrow indicated by a solid line indicates linearly polarized light (first or second linearly polarized light).
- the excitation light 4 that is the first linearly polarized light (TM polarized light or p polarized light) is irradiated on the reflecting means 10 side surface of the fluorescent screen.
- the excitation light 4 sequentially passes through the fluorescent reflection layer 11, the polarizing layer 13a, and the retardation layer 12a. In the process in which the excitation light 4 transmitted through the polarizing layer 13a passes through the retardation layer 12a, the excitation light 4 is converted from first linearly polarized light to circularly polarized light. The circularly polarized excitation light 4 that has passed through the retardation layer 12a is incident on the diffusion region 1_B.
- the circularly polarized excitation light 4 is diffused, and about 50% of the diffused light is emitted in the direction toward the base material 2, and the remaining light is emitted toward the retardation layer 12a.
- Diffused light (circularly polarized light) emitted from the diffusion region 1_B in the direction toward the phase difference layer 12a passes through the phase difference layer 12a and then enters the polarization layer 13a.
- the diffused light is converted from circularly polarized light to second linearly polarized light.
- the polarizing layer 13a reflects the diffused light of the second linearly polarized light from the retardation layer 12a in the direction toward the retardation layer 12a.
- the reflected light of the second linearly polarized light reflected by the polarizing layer 13a enters the diffusion region 1_B after passing through the retardation layer 12a.
- the reflected light is converted from the second linearly polarized light to circularly polarized light.
- the circularly polarized reflected light is incident on the diffusion region 1_B.
- the circularly polarized reflected light is diffused, and about 50% of the diffused light is emitted in the direction toward the base material 2, and the remaining light is emitted toward the retardation layer 12a.
- the circularly polarized reflected light incident on the diffusion region 1_B corresponds to about 25% of the circularly polarized excitation light 4 incident on the diffusion region 1_B.
- Diffused light (circularly polarized light) emitted from the diffusion region 1_B in the direction toward the phase difference layer 12a sequentially passes through the phase difference layer 12a and then enters the polarization layer 13a.
- the diffused light is converted from circularly polarized light to first linearly polarized light.
- the polarizing layer 13a transmits the first linearly polarized diffused light from the retardation layer 12a as it is.
- the diffused light of the first linearly polarized light that has passed through the polarizing layer 13 a is incident on the fluorescent reflecting layer 11.
- the fluorescent reflection layer 11 transmits the first linearly polarized diffused light as it is from the polarizing layer 13a.
- the first linearly polarized diffused light transmitted through the fluorescent reflecting layer 11 corresponds to about 25% of the circularly polarized excitation light 4 incident on the diffusion region 1_B.
- the diffused light of the excitation light 4 is emitted in both directions on the front surface side (base material 2 side) and the back surface side (fluorescent reflection layer 11 side), but is emitted on the back surface side.
- About 50% of the diffused light is reflected by the reflecting means 10 toward the surface side. Therefore, similarly to the case of the first embodiment, the fluorescent screen of this embodiment also has the brightness of the blue diffused light observed from the surface side without the retardation layer 12a and the polarizing layer 13a. In comparison, it can be increased by about 1.5 times.
- the phosphor absorbs the circularly polarized excitation light 4 transmitted through the reflecting means 10 to emit fluorescence, and the diffused light of the emitted fluorescence is reflected on the surface side (base material 2 Side) and the back side (fluorescent reflection layer 11 side). Most of the fluorescent diffused light emitted to the back side is reflected by the fluorescent reflecting layer 11 in the direction of the front side. Therefore, most of the fluorescent diffused light can be extracted from the surface side.
- red and green fluorescent diffused light emitted from the phosphor regions 1_R and 1_G can be extracted from the surface side, and about the excitation light 4 incident on the diffused region 1_B. Since 75% of light can be extracted from the surface side, a high-luminance image can be provided.
- the retardation layer 12a and the polarizing layer 13a are formed not only on the diffusion region 1_B but also on the phosphor regions 1_R and 1_G. However, the portions of the retardation layer 12a and the polarizing layer 13a formed on the phosphor regions 1_R and 1_G are unnecessary because they do not act on the fluorescence. On the other hand, according to the present embodiment, the retardation layer 12a and the polarizing layer 13a are formed only on the diffusion region 1_B. Thus, since it is not necessary to form the retardation layer 12a and the polarizing layer 13a on the phosphor regions 1_R and 1_G, the thickness of the screen can be reduced, and the cost can be reduced.
- the fluorescent reflection layer 11 may be formed only on the phosphor regions 1_R and 1_G.
- FIG. 5 is a cross-sectional view schematically showing a partial cross-sectional structure of a fluorescent screen according to the third embodiment of the present invention.
- the fluorescent screen of this embodiment is the same as that of the first embodiment except that the diffusion region 1_B and a part of the reflection means 10 are different.
- the diffusion region 1_B is made of a diffusion material that does not retain polarized light.
- the diffusion material include inorganic particles such as calcium carbonate and barium sulfate, and organic particles such as polymethyl methacrylate (PMMA) and polystyrene (PS).
- PMMA polymethyl methacrylate
- PS polystyrene
- a diffusion region 1_B is formed by applying a mixture of such a diffusion material to a binder such as an acrylic resin to a desired region of the substrate 2 and thermally curing or photocuring.
- the reflecting means 10 has a fluorescent reflecting layer 11 and a polarizing layer 13, but is different from that of the first embodiment in that it does not have a retardation layer 12.
- the fluorescent reflection layer 11 and the polarizing layer 13 are the same as those in the first embodiment.
- FIG. 6 is a schematic diagram for explaining the operation of the reflecting means 10 in the diffusion region 1_B.
- an arrow indicated by a broken line indicates random polarization
- an arrow indicated by a solid line indicates linearly polarized light (first or second linearly polarized light).
- the excitation light 4 which is the first linearly polarized light (TM polarized light or p polarized light) is irradiated on the reflecting means 10 side surface of the fluorescent screen.
- the excitation light 4 sequentially passes through the polarizing layer 13 and the fluorescent reflection layer 11 and enters the diffusion region 1_B.
- the incident excitation light 4 is diffused, and randomly polarized diffused light is emitted in both directions on the front surface side and the back surface side.
- the randomly polarized diffused light emitted from the diffusion region 1_B in the direction of the back surface passes through the fluorescent reflection layer 11 and enters the polarization layer 13.
- the polarizing layer 13 transmits the first linearly polarized light as it is, and reflects the second linearly polarized light in the direction toward the diffusion region 1_B.
- the reflected light of the second linearly polarized light from the polarizing layer 13 passes through the fluorescent reflecting layer 11 and enters the diffusion region 1_B.
- the incident reflected light of the second linearly polarized light is diffused, and randomly polarized diffused light is emitted in both directions on the front surface side and the back surface side. Thereafter, the process of diffusing the second linearly polarized light in the diffusion region 1_B and the process of transmitting the first linearly polarized light and reflecting the second linearly polarized light in the polarizing layer 13 are repeated.
- T is the following equivalent absorption equation: Given by.
- the light extraction efficiency T is 50%. Therefore, according to the fluorescent screen of the present embodiment, the luminance of the blue diffused light observed from the front side is about 1.3 times that of the screen having no retardation layer 12 and polarizing layer 13. To increase.
- the phosphor absorbs the excitation light 4 transmitted through the reflecting means 10 and emits fluorescence.
- the emitted fluorescent diffused light is emitted to the front side (base material 2 side) and the back side (fluorescent reflective layer 11 side), but most of the fluorescent diffused light emitted to the back side is fluorescent reflective layer 11. Is reflected in the direction of the surface side. Therefore, most of the fluorescent diffused light can be extracted from the surface side.
- red and green fluorescent diffused light emitted from the phosphor regions 1_R and 1_G can be extracted from the surface side, and about the excitation light 4 incident on the diffused region 1_B. Since 67% of light can be extracted as diffused light from the surface side, a high-luminance image can be provided.
- the fluorescent screen of the present embodiment does not have the retardation layer 12 as compared with that of the first embodiment, the thickness of the screen can be reduced and the number of manufacturing steps can be reduced. In addition, cost can be reduced.
- the reflecting means 10 may have a structure in which the polarizing layer 13 and the fluorescent reflecting layer 11 are sequentially laminated from the base material 2 side.
- FIG. 7 is a cross-sectional view schematically showing a partial cross-sectional structure of a fluorescent screen according to the fourth embodiment of the present invention.
- the phosphor screen of this embodiment is the same as that of the second embodiment except that the diffusion region 1_B and a part of the reflection means 10 are different.
- the diffusion region 1_B is the same as that of the third embodiment.
- the reflection means 10 includes the fluorescent reflection layer 11 and the polarizing layer 13a, but differs from that of the second embodiment in that it does not include the retardation layer 12a.
- the fluorescent reflection layer 11 and the polarizing layer 13a are the same as those in the second embodiment.
- the fluorescent reflection layer 11 may be formed only on the phosphor regions 1_R and 1_G.
- FIG. 8 is a cross-sectional view schematically showing a partial cross-sectional structure of a fluorescent screen according to the fifth embodiment of the present invention.
- the fluorescent screen of this embodiment is the same as that of the second embodiment except that a part of the reflecting means 10 is different.
- the reflecting means 10 includes a fluorescent reflecting layer 11a, a retardation layer 12a, and a polarizing layer 13a.
- the retardation layer 12a and the polarizing layer 13a are the same as those in the second embodiment, and are formed on the diffusion region 1_B.
- the fluorescent reflection layer 11a is formed on the phosphor regions 1_R and 1_G.
- the phosphor region 1_R and the fluorescent reflection layer 11a are laminated in this order from the substrate 2 side, and the phosphor region 1_G and the fluorescence reflection layer 11a are laminated in this order from the substrate 2 side.
- the laminated portion and the laminated portion in which the diffusion region 1_B, the retardation layer 12a, and the diffusion layer 13a are laminated in this order from the substrate 2 side are partitioned by the black stripe 1_BK.
- the thickness of each laminated part is substantially the same.
- the retardation layer 12 may be deleted, and the diffusion region 1_B may be made of the diffusion material described in the third embodiment.
- the excitation light 4 may be the second linearly polarized light (TE polarized light or s polarized light).
- the polarizing layers 13 and 13a have such characteristics that the second linearly polarized light (TE polarized light or s polarized light) is transmitted and the first linearly polarized light (TM polarized light or p polarized light) is reflected.
- the fluorescent screen of the present invention described above can be applied to all rear projection type image display apparatuses.
- FIG. 9 shows an example of an image display device provided with the fluorescent screen of the present invention.
- the image display device is of a rear projection type, and includes a control unit 20, an excitation light source 21, a scanning unit 22, and a fluorescent screen 24.
- the fluorescent screen 24 is configured by any of the fluorescent screens of the above-described embodiments.
- the excitation light source 21 is a laser light source typified by, for example, a laser diode (LD) and emits first linearly polarized light (TM polarized light or p polarized light) or second linearly polarized light (TE polarized light or s polarized light). Output. Whether the excitation light is set to the first or second linearly polarized light depends on the configuration of the fluorescent screen (characteristics of the polarizing layer).
- the scanning unit 22 scans the surface of the fluorescent screen 24 on the reflecting means 10 side with a light beam from the excitation light source 21 (excitation light 4 shown in FIG. 1 and the like) like a wavy scanning locus 23a.
- the scanning unit 22 is composed of a resonant mirror such as a polygon mirror, a galvano mirror, or a MEMS (Micro Electro Mechanical Systems).
- the scanning unit 22 may be a biaxial scanning element capable of scanning in both the horizontal direction and the vertical direction, or a combination of a scanning element that scans in the horizontal direction and a scanning element that scans in the vertical direction. It may be a configuration.
- the excitation light is scanned in the horizontal direction, and the scanning direction is reversed at the left and right ends of the fluorescent screen 24.
- the fluorescent screen 24 can be two-dimensionally scanned.
- the control unit 20 controls the operations of the scanning unit 22 and the excitation light source 21 based on the video signal S input from the external device.
- the external device is a video signal supply device represented by a personal computer or the like.
- the excitation light source 21 has a structure that outputs randomly polarized excitation light, polarization conversion that converts the excitation light into the first or second linearly polarized light in the optical path of the excitation light emitted from the excitation light source 21.
- An element may be provided.
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- Multimedia (AREA)
- Signal Processing (AREA)
- Spectroscopy & Molecular Physics (AREA)
- General Engineering & Computer Science (AREA)
- Overhead Projectors And Projection Screens (AREA)
- Polarising Elements (AREA)
- Transforming Electric Information Into Light Information (AREA)
- Optical Elements Other Than Lenses (AREA)
Abstract
Description
第1の直線偏光を吸収して蛍光を発生する蛍光体を含む蛍光体領域と、前記第1の直線偏光を拡散する拡散領域とを備えた蛍光スクリーンであって、
前記拡散領域に対して前記第1の直線偏光が入射される側に配置された偏光層を有し、
前記偏光層は、前記第1の直線偏光を透過し、かつ、前記第1の直線偏光と振動方向が異なる第2の直線偏光を反射することを特徴とする。
上記の蛍光スクリーンと、
第1の直線偏光を出力する励起光源と、
前記励起光源から出力された前記第1の直線偏光で前記蛍光スクリーンの一方の面を走査する走査部と、を有する。
1_B 拡散領域
1_BK ブラックストライプ
2 基材
10 反射手段
11 蛍光反射層
12 位相差層
13 偏光層
図1は、本発明の第1の実施形態である蛍光スクリーンの一部の断面構造を模式的に示す断面図である。
図3は、本発明の第2の実施形態である蛍光スクリーンの一部の断面構造を模式的に示す断面図である。
図5は、本発明の第3の実施形態である蛍光スクリーンの一部の断面構造を模式的に示す断面図である。
図7は、本発明の第4の実施形態である蛍光スクリーンの一部の断面構造を模式的に示す断面図である。
図8は、本発明の第5の実施形態である蛍光スクリーンの一部の断面構造を模式的に示す断面図である。
Claims (10)
- 第1の直線偏光を吸収して蛍光を発生する蛍光体を含む蛍光体領域と、前記第1の直線偏光を拡散する拡散領域とを備えた蛍光スクリーンであって、
前記拡散領域に対して前記第1の直線偏光が入射される側に配置された偏光層を有し、
前記偏光層は、前記第1の直線偏光を透過し、かつ、前記第1の直線偏光と振動方向が異なる第2の直線偏光を反射することを特徴とする蛍光スクリーン。 - 前記第1の直線偏光を透過させて前記蛍光体領域へ入射させ、該入射により前記蛍光体領域にて発生した前記蛍光を前記蛍光体領域側へ反射させる蛍光反射層をさらに有する請求項1に記載の蛍光スクリーン。
- 前記蛍光反射層は、前記蛍光体領域および拡散領域を含む領域上に形成され、前記偏光層は前記蛍光反射層上に形成されている、請求項2に記載の蛍光スクリーン。
- 前記偏光層は前記拡散領域上に形成され、前記蛍光反射層は、前記蛍光体領域および偏光層を含む領域上に形成されている、請求項2に記載の蛍光スクリーン。
- 前記偏光層および拡散領域の積層部と前記蛍光体領域とは、前記励起光および蛍光を吸収するブラックストライプにより区画されている、請求項4に記載の蛍光スクリーン。
- 前記蛍光反射層は前記蛍光体領域上に形成され、前記偏光層は前記拡散領域上に形成されている、請求項2に記載の蛍光スクリーン。
- 前記拡散領域および偏光層の積層部と前記蛍光体領域および蛍光反射層の積層部とは、前記励起光および蛍光を吸収するブラックストライプにより区画されている、請求項6に記載の蛍光スクリーン。
- 前記偏光層は、前記蛍光体領域および拡散領域を含む領域上に形成され、前記蛍光反射層は前記偏光層上に形成されている、請求項2に記載の蛍光スクリーン。
- 前記拡散領域と前記偏光層との間に設けられ、前記偏光層側から入射する前記第1および第2の直線偏光をそれぞれ円偏光に変換し、前記拡散領域側から入射する円偏光をその回転方向に応じて前記第1または第2の直線偏光に変換する位相差層を、さらに有する、請求項1から8のいずれか1項に記載の蛍光スクリーン。
- 請求項1から9のいずれか1項に記載の蛍光スクリーンと、
第1の直線偏光を出力する励起光源と、
前記励起光源から出力された前記第1の直線偏光で前記蛍光スクリーンの一方の面を走査する走査部と、を有する、画像表示装置。
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US14/126,380 US8967818B2 (en) | 2011-06-20 | 2012-05-28 | Fluorescent screen and image display device provided with same |
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JPH10319877A (ja) * | 1997-05-16 | 1998-12-04 | Toshiba Corp | 画像表示装置及び発光装置 |
JP2007033813A (ja) * | 2005-07-26 | 2007-02-08 | Nec Corp | 光源装置、液晶表示装置及び端末装置 |
JP2008170674A (ja) * | 2007-01-11 | 2008-07-24 | Seiko Instruments Inc | 画像表示装置 |
JP2008538145A (ja) * | 2005-04-01 | 2008-10-09 | スプドニック インコーポレイテッド | 光学蛍光材料を含むスクリーンを有する表示システム及び装置 |
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JP5568844B2 (ja) * | 2007-08-08 | 2014-08-13 | セイコーエプソン株式会社 | 画像表示装置 |
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JPH10319877A (ja) * | 1997-05-16 | 1998-12-04 | Toshiba Corp | 画像表示装置及び発光装置 |
JP2008538145A (ja) * | 2005-04-01 | 2008-10-09 | スプドニック インコーポレイテッド | 光学蛍光材料を含むスクリーンを有する表示システム及び装置 |
JP2007033813A (ja) * | 2005-07-26 | 2007-02-08 | Nec Corp | 光源装置、液晶表示装置及び端末装置 |
JP2008170674A (ja) * | 2007-01-11 | 2008-07-24 | Seiko Instruments Inc | 画像表示装置 |
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