WO2012172672A1 - 蛍光体カラーホイルおよびそれを内蔵する投写型表示装置 - Google Patents
蛍光体カラーホイルおよびそれを内蔵する投写型表示装置 Download PDFInfo
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- WO2012172672A1 WO2012172672A1 PCT/JP2011/063807 JP2011063807W WO2012172672A1 WO 2012172672 A1 WO2012172672 A1 WO 2012172672A1 JP 2011063807 W JP2011063807 W JP 2011063807W WO 2012172672 A1 WO2012172672 A1 WO 2012172672A1
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- phosphor
- light
- excitation light
- substrate
- color foil
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/007—Optical devices or arrangements for the control of light using movable or deformable optical elements the movable or deformable optical element controlling the colour, i.e. a spectral characteristic, of the light
- G02B26/008—Optical devices or arrangements for the control of light using movable or deformable optical elements the movable or deformable optical element controlling the colour, i.e. a spectral characteristic, of the light in the form of devices for effecting sequential colour changes, e.g. colour wheels
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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
- G03B21/14—Details
- G03B21/16—Cooling; Preventing overheating
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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
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2006—Lamp housings characterised by the light source
- G03B21/2033—LED or laser light sources
- G03B21/204—LED or laser light sources using secondary light emission, e.g. luminescence or fluorescence
Definitions
- the present invention relates to a phosphor color foil that emits light having a wavelength different from that of excitation light emitted from a light source from a phosphor, and a projection display device incorporating the phosphor color foil.
- the brightness of a projection display device that includes an illumination optical system including a light source, a light valve (display device), and a projection optical system mainly includes the etendue of the light source, the brightness of the light source, and the transmission of each optical system. It depends on the rate and the etendue of the projection optical system.
- the efficiency of the entire projection display apparatus is determined by the transmittance of each optical system.
- the etendue of the light source does not match the etendue of the projection optical system, it is related to factors other than the transmittance of each optical system among the above-mentioned factors that determine the brightness of the projection display device. As a result, the overall efficiency of the projection display device is lowered.
- E MD of the projection optical system is determined as follows according to the size of the display portion of the light valve and the F value (F number) of the projection lens (see Patent Document 2).
- E MD ⁇ A MD / 4 (F / #) 2 (A MD : Light bulb display area, F / #: F value of projection lens)
- the etendue E Light of the light source matches the etendue E MD of the projection optical system, or from the etendue E Light of the light source. it is also desirable greater in etendue E MD of the projection optical system. This means that it is desirable that the light emission area of the light source is small and the light emission angle is small.
- a projection display device that does not require the same polarization, such as a configuration having a DMD (digital micromirror device) as a light valve, the etendue E Light of the light source and the etendue E of the projection optical system when E Light ⁇ E MD. It can be said that MD is compatible.
- DMD digital micromirror device
- the etendue of the light source is effectively doubled, so that 2E Light ⁇ E it can be said that the etendue E MD etendue E light and the projection optical system of the light source when the MD are compatible.
- High-pressure mercury lamps are mainly used as light sources for projection display devices, but light sources that do not contain environmental pollutants such as mercury are desired, and LEDs and laser light sources are attracting attention as candidates for next-generation light sources. .
- the LED Since the LED has a large light emitting area, the LED has a feature that the etendue E Light of the light source is larger than that of the high pressure mercury lamp and its luminous efficiency is lower than that of the high pressure mercury lamp. Therefore, in order to realize a projection display device having the same brightness as a high-pressure mercury lamp using LEDs, it is necessary to increase the etendue E MD of the projection optical system, for example, by increasing the size of the display portion of the light valve. . As a result, the entire apparatus is increased in size and cost.
- the laser light source has a feature that the light emitting area is very small, and the etendue E Light of the light source is very small and the light emission efficiency is high compared to the high pressure water source lamp. Therefore, in the case of using a laser light source, it is possible to reduce the etendue E MD of the projection optical system than when using a high-pressure mercury lamp. Therefore, the entire apparatus can be reduced in size, increased in efficiency, and reduced in cost.
- the laser light source has severe restrictions such as safety standards, and products having all laser light sources cannot be freely marketed. Only products that meet the restrictions such as safety standards are commercially available. As a result, the brightness of commercially available projection display devices is limited.
- a novel light source that emits light by converting the wavelength with a phosphor using excitation light as a laser is provided.
- Projection display devices are being developed.
- This new light source has a light emitting area smaller than that of the LED, and the light source Etendue E Light is smaller than the LED and larger than the laser light source.
- the light emission efficiency depends on the efficiency of the laser that is the excitation light, the light emission efficiency is higher than that of the LED particularly in the green laser, and is equivalent to the LED in the red laser.
- the projection display device when a configuration in which the green light source is a laser light source that emits a phosphor using laser as excitation light is adopted, the projection display device is smaller and brighter than the configuration in which all three light sources of red, green, and blue are LEDs. Can be realized.
- Such a projection display device can achieve brightness equivalent to that of an existing projection display device having a mercury lamp with an equivalent device size. Furthermore, when all three light sources of red, green, and blue are light sources that emit phosphors using laser as excitation light, the number of laser light sources is reduced by using one laser light source in common for each color. This is effective for cost reduction.
- the phosphor coating region on the substrate 100 is divided into a plurality of segments 101a and 101b, and the central angle of each segment 101a and 101b is determined in accordance with the irradiation time of the laser of each color. That is, the segments 101a and 101b to be irradiated with the laser are formed for each color on one phosphor color foil. Different phosphors are applied to the segments 101a and 101b corresponding to the respective colors.
- the locus 103 of the irradiation position when the laser irradiation is performed while rotating the substrate 100 by the rotary motor 102 is indicated by a broken line.
- FIG. 2 there is a configuration in which the same phosphor is applied to each of the plurality of segments 101a and 101b corresponding to each color of the phosphor color foil, and the diffusion plate 104 is disposed on a part of the segments 101b. .
- any phosphor color foil having the configuration shown in FIGS. 1 and 2 is difficult to use for various projection display devices having different performances.
- a phosphor color foil suitable for a specific projection display device, a projection display device having a laser light source having a brightness different from that of the projection display device, and the brightness of LEDs used in combination with the laser light source are different. If diverted to a projection display device, there is a possibility that appropriate color development cannot be performed.
- the time for the excitation light (laser, etc.) to enter each segment of the phosphor color foil is determined so that the distribution of the amount of light of each color (red, green, blue) is optimal in a specific projection display device, Also in the projection display apparatus, the proportion of time during which excitation light is incident on each segment is always constant. If the phosphor color foil is used in a projection display device having a light source (laser light source or LED) that emits brighter light, it takes too long time to irradiate the phosphor with light from the brighter light source. That could happen.
- a light source laser light source or LED
- the time for which the light from the darker light source is irradiated onto the phosphor may be too short.
- the balance of the amount of light of each color red, green, blue
- the white chromaticity coordinates are changed.
- the phosphor color foil individually adjusted for each projection display device is used so that the distribution of the light amount of each color is constant. There is a need. That is, it is necessary to prepare phosphor color foils having different segment sizes for each projection display device.
- the same phosphor color foil cannot be used in common in a projection display device having a light source with different performance.
- Manufacturing cost is high because it is necessary to make a phosphor color foil dedicated to the projection display device. In particular, it is very inefficient when the projection display device is produced in a small variety of products.
- an object of the present invention is to solve the above-described problems and provide a general-purpose phosphor color foil that can be widely used in various projection display devices and a projection display device incorporating the same.
- the phosphor color foil of the present invention has a substrate that is driven to rotate and a phosphor that is applied in a ring shape on the surface of the substrate, and the center of the phosphor coating region is different from the center of rotation of the substrate.
- the ring said here is not restricted to a perfect circle shape.
- the projection display device includes an illumination optical system including the phosphor color foil, a rotation driving unit that rotationally drives the substrate, and a light source that emits excitation light to the phosphor color foil, and an illumination optical system.
- the locus of the excitation light emitted from the light source is arranged so as to be formed on the phosphor color foil substrate so as to straddle the inside and outside of the phosphor coating area, and the phosphor is excited from the light source. When irradiated with light, it emits fluorescence having a wavelength different from that of the excitation light.
- the projection display device of the present invention includes an illumination optical system including the phosphor color foil, a rotation driving unit that rotationally drives the substrate, and a light source that irradiates the phosphor color foil with excitation light, and illumination optics.
- the light source is a rotation of a phosphor color foil
- the locus of the excitation light emitted from the light source is arranged on the phosphor color foil substrate so as to straddle the phosphor coating area and the other phosphor coating area. Emits fluorescence having a wavelength different from that of excitation light when irradiated with excitation light from a light source, and other phosphors emit either excitation light or fluorescence emitted by the aforementioned phosphors when irradiated with excitation light from a light source. Both have different wavelengths Emit other fluorescence.
- the projection display method of the present invention draws a trajectory straddling the inside and outside of the phosphor coating region with excitation light on the substrate while rotating the substrate on which the phosphor is circularly coated.
- the phosphor emits fluorescence having a wavelength different from that of the excitation light, and when the excitation light enters the phosphor coating area, It is characterized by not emitting light by the body.
- a phosphor is coated on the surface in a ring shape, and another phosphor is coated in a ring shape on the inner side or the outer side adjacent to the phosphor coating region.
- the phosphor emits fluorescence having a wavelength different from that of the excitation light, and when the excitation light is incident on the coating area of the other phosphor, both the excitation light and the fluorescence emitted by the phosphor have a wavelength. It is characterized in that it emits other fluorescent light of different from each other.
- the irradiation position of the excitation light on the substrate may be adjusted by adjusting the relative position between the substrate and the light source that emits the excitation light.
- the same phosphor color foil can be used in common for a plurality of projection display devices of different types and performances, for example, a plurality of projection display devices having light sources of different brightness, This enables appropriate color development in the projection display apparatus. Since it is not necessary to design and manufacture a phosphor color foil dedicated to each projection display device, the manufacturing cost can be reduced.
- (A) is the front view of the fluorescent substance color foil and rotary motor of 1st related technology
- (b) is the side view.
- (A) is the front view of the fluorescent substance color foil and rotary motor of 2nd related technology
- (b) is the side view.
- (A) is the front view of the fluorescent substance color foil and rotary motor of the 1st Embodiment of this invention
- (b) is the side view.
- (A) is a front view which shows the state which incorporated the fluorescent substance color foil and rotary motor shown in FIG. 3 in another apparatus
- (b) is the side view.
- (A) is the front view of the fluorescent substance color foil and rotary motor of the 2nd Embodiment of this invention
- (b) is the side view.
- (A) is the front view of the fluorescent substance color foil and rotary motor of the 3rd Embodiment of this invention
- (b) is the side view.
- (A) is the front view of the fluorescent substance color foil and rotary motor of the 4th Embodiment of this invention
- (b) is the side view. It is the schematic which shows an example of the projection type display apparatus of this invention.
- FIG. 3 shows a phosphor color foil 1 according to the first embodiment of the present invention.
- This phosphor color foil 1 has a configuration in which a disk-shaped glass substrate 2 is attached to a rotation motor (rotation drive means) 3, and the central axis of the glass substrate 2 coincides with the rotation axis 4 of the rotation motor 3. Yes.
- the glass substrate 2 has an optical multilayer film having a characteristic of transmitting the excitation light and reflecting the light excited by the excitation light. Further, a phosphor (first phosphor) 5 is applied on the optical multilayer film.
- the phosphor 5 is, for example, a phosphor that converts the wavelength of blue light into green.
- region of the fluorescent substance 5 is a cyclic
- the outer boundary line 5a and the inner boundary line 5b are circles each having a center, and the centers are eccentric. In other words, the central axis of the outer boundary line 5a and the central axis of the inner boundary line 5b are shifted from each other.
- the outer boundary line 5a of the phosphor 5 and the glass substrate 2 are concentric, the center axes of both coincide, and the rotation axis 4 of the rotary motor 3 also coincides.
- the center axis 6 of the inner boundary line 5 b does not coincide with the rotation axis 4 of the rotary motor 3.
- region of the fluorescent substance 5 becomes an uneven ring shape which is wide on one side (right side in FIG. 3) and narrow on the opposite side (left side in FIG. 3).
- the central axis of the outer boundary line 5a and the central axis 6 of the inner boundary line 5b are preferably separated by 2 mm or more.
- This phosphor color foil 1 is irradiated with excitation light. Since the glass substrate 2 is rotated by the rotation motor 3, the irradiation position of the excitation light on the glass substrate 2 draws a circular locus 8 on the glass substrate 2.
- This locus 8 is a circle centered on the rotation axis 4 and is concentric with the outline of the glass substrate 2 and the outer boundary 5 a of the phosphor 5. On the other hand, the center of the locus 8 does not coincide with the center of the inner boundary line 5b.
- the application region of the phosphor 5 is an irregular ring with a variable width. As a result, as shown in FIG.
- excitation light for example, blue laser
- the phosphor color foil 1 is periodically incident and non-incident on the phosphor 5. repeat.
- the phosphor 5 is excited and emits green fluorescence. Further, the green fluorescence traveling in the direction of the glass substrate 2 is reflected by the optical multilayer film.
- the excitation light passes through the glass substrate 2. The size and shape of the application region of the phosphor 5 and the irradiation position of the excitation light on the phosphor color foil 1 are determined so that the emission time and non-light emission time of green fluorescence are appropriate.
- the generation time of the fluorescence can be controlled by the irradiation position of the excitation light on the phosphor color foil 1 without changing the phosphor color foil.
- the irradiation position of the excitation light on the phosphor color foil 1 is made more central.
- the radius of the locus 8 drawn by the irradiation position of the excitation light is reduced, and as a result, the portion where the excitation light hits the phosphor 5 is reduced. That is, the irradiation time of the excitation light to the phosphor 5 is shortened and the non-irradiation time is lengthened. That is, the fluorescence emission time is shortened.
- the emission time of the fluorescence can be controlled by the irradiation position of the excitation light on the phosphor color foil 1.
- one phosphor color foil 1 can be used for general purposes, contributing to a reduction in manufacturing cost. That is, even when a plurality of types of projection display devices are manufactured, it is not necessary to keep various phosphor color foils 1 in stock, and it is possible to immediately and easily cope with a model change of the projection display device. be able to.
- FIG. 5 shows a phosphor color foil 1 according to a second embodiment of the present invention.
- the blue (first phosphor) 5 that converts the wavelength of blue light into green light is adjacent to the annular coating region of the phosphor
- the blue Another phosphor (second phosphor) 9 that converts the wavelength of light into red light is applied in a ring shape.
- the central axis 6 of the outer boundary line 9 a and the inner boundary line 9 b of the application region of the second phosphor 9 is common to the central axis of the inner boundary line 5 b of the application region of the first phosphor 5.
- the inner boundary line 5b of the application region of the first phosphor 5 and the outer boundary line 9a of the second phosphor 9 may coincide with each other.
- the area of the application region of the first phosphor 5 is larger than the area of the application region of the second phosphor 9.
- the locus 8 of the excitation light during rotation of the phosphor color foil 1 is formed across the application region of the first phosphor 5 and the application region of the second phosphor 9, and has a period.
- a state in which blue excitation light (laser) emits green fluorescence by irradiating the first phosphor 5 and a state in which red fluorescence is emitted by irradiating the second phosphor 9 are alternately repeated. It is. Both green light and red light are reflected by the optical multilayer film of the glass substrate.
- the application region of the first phosphor 5 and the application region of the second phosphor 9 are appropriately set, and the time during which the excitation light irradiates the first phosphor 5 (green fluorescence emission)
- the time during which the excitation light irradiates the first phosphor 5 green fluorescence emission
- the time for irradiating the second phosphor 9 light emission time of red fluorescence
- the distribution of the light emission time of green and red can be made appropriate.
- the distribution of the light emission time of green and red can be controlled by the distance from the rotation center of the phosphor color foil 1 to the irradiation position of the excitation light.
- the second phosphor 9 may be applied inside the application region of the first phosphor 5 by switching the application region of the first phosphor 5 and the application region of the second phosphor 9. That is, even if the application area of the second phosphor 9 is present inside the application area of the first phosphor 5, the application area of the second phosphor 9 exists outside the application area. It doesn't matter.
- FIG. 6 shows a phosphor color foil 1 according to a third embodiment of the present invention.
- the inner boundary line 5a of the application region of the first phosphor 5 is an ellipse
- the second phosphor 9 is located adjacent to and inside the application region of the first phosphor 5.
- the outer boundary line 9 a and the inner boundary line 9 b of the application region are also elliptical along the inner boundary line 5 a of the application region of the first phosphor 5.
- the inner boundary line 5a of the application region of the first phosphor 5 and the outer boundary line 9a and the inner boundary line 9b of the application region of the second phosphor 9 have a common center.
- the passing axis (center axis 6) is away from the rotating shaft 4 of the rotary motor 3.
- FIG. 7 shows a phosphor color foil 1 according to a fourth embodiment of the present invention.
- the outer boundary line 5a and inner boundary line 5b of the application region of the first phosphor 5 and the outer boundary line 9a and inner boundary line 9b of the application region of the second phosphor 9 are all common. It has a central axis 6.
- This central axis 6 is the central axis of the glass substrate 2.
- the glass substrate 2 is attached to the rotary motor 3 so that the central axis 6 is located away from the rotary shaft 4 of the rotary motor 3.
- a mechanism capable of moving the glass substrate 2 is provided.
- the central axis 6 of the glass substrate 2 and the rotary motor are moved. It is possible to adjust an interval (amount of deviation) between the three rotating shafts 4.
- the movement of the glass substrate 2 may be a discontinuous (stepwise) movement or a continuous movement.
- the same effect as that of the third embodiment can be obtained.
- the phosphor color foil 1 mounting portion or the light source is mounted in a housing (not shown). The position and shape of the part are changed.
- this embodiment since it can respond by adjusting the mechanism attached to this fluorescent substance color foil 1, adjustment work is very easy and it is necessary to modify the design of the housing itself. Absent.
- FIG. 8 shows an example of the projection display device of the present invention.
- the projection display device includes the phosphor color foil 1 according to any one of the second to fourth embodiments. Further, the projection display device includes a laser light source 11 that emits a blue laser as a light source that emits excitation light that is incident on the phosphor color foil 1. Moreover, LED12 which emits the blue light as a light source is also provided.
- a dichroic mirror 13 is disposed at a position where the blue laser from the laser light source 11 and the blue light from the LED 12 are irradiated. The dichroic mirror 13 reflects blue light and transmits green light and red light.
- a collimator lens group 14 is disposed between the LED 12 and the dichroic mirror 13.
- the dichroic mirror 13 is opposed to a part of the glass substrate 2 of the phosphor color foil 1 through the collimator lens group 15. However, the dichroic mirror 13 is located away from the rotary shaft 4 of the rotary motor 3.
- a condenser lens 16 When viewed from the dichroic mirror 13, on the opposite side of the collimator lens group 15 and the phosphor color foil 1, a condenser lens 16, a lot lens 17, a relay lens group 18, a condenser lens 19, and a DMD (digital micromirror device) ) 20 are arranged in order.
- a projection lens 21 is disposed at a position where light reflected by the DMD 20 is incident. Roughly speaking, it can be said that the phosphor color foil 1 and the rotary motor 3 to the condenser lens 19 are an illumination optical system, the DMD 20 is a light valve (display device), and the projection lens 21 is a projection optical system.
- the blue laser emitted from the laser light source 11 is reflected by the dichroic mirror 13 and irradiated onto the glass substrate 2 of the phosphor color foil 1 through the collimator lens group 15. Since the glass substrate 2 is rotated by the rotary motor 3, the irradiation position of the blue laser draws a circular locus 8 as shown in FIG. The locus 8 is located so as to straddle the application region of the first phosphor 5 and the application region of the second phosphor 9. The timing of the blue laser incident on the first phosphor 5 and the incident on the second phosphor 9 is synchronized with the driving of the DMD 20 by an electric circuit (not shown).
- the blue laser beam is incident on the first phosphor 5 when performing green display, and the blue laser beam is incident on the second phosphor 9 when performing red display.
- the LED 12 is operated without operating the laser light source 11.
- the phosphor color foil 1 is not irradiated with excitation light.
- the first phosphor 5 excited by the blue laser emits green fluorescence, and the green fluorescence is the first phosphor. 5 is diffused in all directions around the emission luminescent spot, and a part thereof is reflected toward the collimator lens group 15 by the optical multilayer film of the glass substrate 2.
- the green fluorescence emitted from the first phosphor 5 is returned to a substantially parallel beam by the collimator lens group 15 and then enters the dichroic mirror 13 again. Thereafter, the green fluorescence passes through the dichroic mirror 13 and travels toward the condenser lens 16.
- the blue laser When the blue laser is incident on the second phosphor 9, the second phosphor excited by the blue laser emits red fluorescence, and the red fluorescence is reflected by the optical multilayer film of the glass substrate 2. Then, it is made substantially parallel by the collimator lens group 15 and enters the dichroic mirror 13 again. Thereafter, the red fluorescence passes through the dichroic mirror 13 and travels toward the condenser lens 16.
- the blue light from the LED 12 is made substantially parallel by the collimator lens group 14 and then enters the dichroic mirror 13. Blue light from the LED 12 is reflected by the dichroic mirror 13 and travels to the opposite side of the phosphor color foil 1, that is, toward the condenser lens 16.
- green fluorescence and red fluorescence from the phosphor color foil 1 and blue light from the LED 12 enter the dichroic mirror 13 and are synthesized by the dichroic mirror 13. Further, these lights are condensed near the center of the incident side end face of the lot lens 17 by the condenser lens 16, and are totally reflected inside the lot lens 17. Thereby, a rectangular and uniform light distribution is formed on the exit side end face of the lot lens 17.
- the light that is uniformly distributed in a rectangular shape is irradiated to a rectangular area larger than the effective area of the display surface of the DMD 20 via the relay lens group 18 and the condenser lens 19.
- the illumination light modulated by the DMD 20 is projected onto a screen (not shown) via the projection lens 21. In this way, the projection display apparatus shown in FIG. 8 performs display.
- the image configured in the DMD 20 is configured by a combination of red (R), green (G), and blue (B). Therefore, in the projection display device, an image is formed by the green fluorescence and the red fluorescence from the phosphor color foil 1 and the blue light from the LED 12. For this purpose, the light is incident on the DMD 20 at different timings for each color. In accordance with this timing, the operation timing of the laser light source 11 and the LED 12, the timing at which the blue laser from the laser light source 11 enters the first phosphor 5, and the timing at which the blue laser 9 enters the second phosphor 9 are determined. Thereby, a desired image can be projected on a screen (not shown).
- a laser excitation
- Such a case can be dealt with by moving the incident position of the laser on the glass substrate 2 of the phosphor color foil 1 in the radial direction of the glass substrate 2.
- the time for the laser to enter the first phosphor 5 is increased. The time becomes shorter and the time for entering the second phosphor 9 becomes longer.
- the incident position of the laser is moved outward in the radial direction of the glass substrate 2
- the time for the laser to enter the first phosphor 5 becomes longer and the time for the laser to enter the second phosphor 9 becomes shorter.
- one phosphor color foil 1 can be widely used for a projection display device having various characteristics.
- the incident position of the laser can be changed by appropriately designing the mounting structure in each housing of each projection display device.
- the laser is utilized using the mechanism. It is not necessary to adjust the mounting structure in the housing of the projection display device.
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Abstract
Description
ELight=πALightsin2(θLight)
(ALight:光源の発光面積、θLight:光源の最大発光角度)
EMD=πAMD/4(F/#)2
(AMD:ライトバルブの表示面積、F/#:投写レンズのF値)
図3に本発明の第1の実施形態の蛍光体カラーホイル1を示す。この蛍光体カラーホイル1は、円板状のガラス基板2が回転モーター(回転駆動手段)3に取り付けられた構成であり、ガラス基板2の中心軸が回転モーター3の回転軸4と一致している。ガラス基板2は、励起光を透過し、その励起光によって励起された光を反射する特性を持つ光学多層膜を有している。さらに、その光学多層膜の上に蛍光体(第1の蛍光体)5が塗布されている。蛍光体5は、例えば、青色の光を緑色に波長変換する蛍光体である。蛍光体5の塗布領域は、外側境界線5aと内側境界線5bとで囲まれた環状領域である。外側境界線5aと内側境界線5bは、それぞれ中心を有する円であり、その中心は偏心している。換言すると、外側境界線5aの中心軸と内側境界線5bの中心軸は互いにずれている。本実施形態では、蛍光体5の外側境界線5aとガラス基板2は同心であり、両者の中心軸が一致するとともに、回転モーター3の回転軸4とも一致している。一方、内側境界線5bの中心軸6は回転モーター3の回転軸4と一致していない。その結果、蛍光体5の塗布領域は、一方の側(図3の右側)では幅広で、その反対側(図3の左側)では幅狭であるいびつな環状になっている。ここで、外側境界線5aの中心軸と内側境界線5bの中心軸6は、2mm以上離れていることが好ましい。
図5に、本発明の第2の実施形態の蛍光体カラーホイル1を示す。本実施形態では、第1の実施形態と同様の、青色の光を緑色の光に波長変換する蛍光体(第1の蛍光体)5の環状の塗布領域に隣接してその内側に、青色の光を赤色の光に波長変換する他の蛍光体(第2の蛍光体)9が環状に塗布されている。第2の蛍光体9の塗布領域の外側境界線9aと内側境界線9bの中心軸6は、第1の蛍光体5の塗布領域の内側境界線5bの中心軸と共通である。ここで、第1の蛍光体5の塗布領域の内側境界線5bと第2の蛍光体9の外側境界線9aとは一致していてもよい。また、第1の蛍光体5の塗布領域の面積は、第2の蛍光体9の塗布領域の面積よりも広い。
図6に、本発明の第3の実施形態の蛍光体カラーホイル1を示す。本実施形態では、第1の蛍光体5の塗布領域の内側境界線5aが楕円形であり、第1の蛍光体5の塗布領域に隣接してその内側に位置する第2の蛍光体9の塗布領域の外側境界線9aおよび内側境界線9bも、第1の蛍光体5の塗布領域の内側境界線5aに沿う楕円形である。そして、第1の蛍光体5の塗布領域の内側境界線5aと、第2の蛍光体9の塗布領域の外側境界線9aおよび内側境界線9bは共通の中心を有しており、この中心を通る軸(中心軸6)は回転モーター3の回転軸4から離れている。
図7に、本発明の第4の実施形態の蛍光体カラーホイル1を示す。本実施形態では、第1の蛍光体5の塗布領域の外側境界線5a、内側境界線5b、第2の蛍光体9の塗布領域の外側境界線9a、内側境界線9bの全てが、共通の中心軸6を有している。この中心軸6がガラス基板2の中心軸である。ただし、この中心軸6が回転モーター3の回転軸4から離れて位置するように、ガラス基板2は回転モーター3に取り付けられている。その上、本実施形態では、図示しないがガラス基板2を移動可能な機構が設けられており、ガラス基板2を回転モーター3に対して移動させることによって、ガラス基板2の中心軸6と回転モーター3の回転軸4との間の間隔(ずれ量)を調整可能である。ガラス基板2の移動は、不連続(段階的)な移動であっても連続的な移動であってもよい。
図8に、本発明の投写型表示装置の一例を示す。この投写型表示装置は、前記した第2~4の実施形態のいずれかの蛍光体カラーホイル1を備えている。さらに、投写型表示装置は、蛍光体カラーホイル1に入射させる励起光を発する光源として、青色レーザーを発するレーザー光源11を備えている。また、光源としての青色光を発するLED12も備えている。レーザー光源11からの青色レーザーとLED12からの青色光とが照射される位置にダイクロイックミラー13が配置されている。このダイクロイックミラー13は、青色光を反射し、緑色光と赤色光を透過させるものである。LED12とダイクロイックミラー13との間にはコリメータレンズ群14が配置されている。ダイクロイックミラー13は、コリメータレンズ群15を介して、蛍光体カラーホイル1のガラス基板2の一部と対向している。ただし、ダイクロイックミラー13は、回転モーター3の回転軸4から離れて位置している。ダイクロイックミラー13から見て、コリメータレンズ群15および蛍光体カラーホイル1の反対側には、集光レンズ16、ロットレンズ17、リレーレンズ群18、コンデンサレンズ19、およびDMD(デジタル・マイクロミラー・デバイス)20が順番に並べて配置されている。そして、DMD20による反射光が入射する位置に、投写レンズ21が配置されている。大まかに言うと、蛍光体カラーホイル1および回転モーター3からコンデンサレンズ19までが照明光学系、DMD20がライトバルブ(表示デバイス)、投写レンズ21が投写光学系であるといえる。
2 ガラス基板
3 回転モーター(回転駆動手段)
4 回転軸
5 蛍光体(第1の蛍光体)
5a 外側境界線
5b 内側境界線
6 中心軸
8 光の照射位置の軌跡
9 他の蛍光体(第2の蛍光体)
9a 外側境界線
9b 内側境界線
11 レーザー光源
12 LED(発光ダイオード)
13 ダイクロイックミラー
14,15 コリメータレンズ群
16 集光レンズ
17 ロットレンズ
18 リレーレンズ群
19 コンデンサレンズ
20 DMD(デジタル・マイクロミラー・デバイス)
21 投写レンズ
Claims (10)
- 回転駆動される基板と、前記基板の表面に環状に塗布されている蛍光体と、を有し、該蛍光体の塗布領域の中心は、前記基板の回転中心と異なることを特徴とする、蛍光体カラーホイル。
- 前記蛍光体の塗布領域の外側境界線と内側境界線のいずれか一方または両方の中心は、前記基板の回転中心と異なる、請求項1に記載の蛍光体カラーホイル。
- 前記基板の中心軸は、前記回転中心から離れている、請求項1または2に記載の蛍光体カラーホイル。
- 前記蛍光体の塗布領域に隣接してその内側または外側に、他の蛍光体が環状に塗布されている、請求項1から3のいずれか1項に記載の蛍光体カラーホイル。
- 請求項1から3のいずれか1項に記載の蛍光体カラーホイルと、前記基板を回転駆動する回転駆動手段と、該蛍光体カラーホイルに対して励起光を照射する光源と、を含む照明光学系と、
前記照明光学系から入射した光を画像信号に合わせて変調するライトバルブと、
前記ライトバルブにて変調された光を外部のスクリーンに投写する投写光学系と、
を有し、
前記光源は、前記蛍光体カラーホイルの回転中に前記光源から照射された前記励起光の軌跡が、前記蛍光体カラーホイルの前記基板上で前記蛍光体の塗布領域内と塗布領域外とに跨って形成されるように配置されており、
前記蛍光体は、前記光源から前記励起光を照射されると該励起光と波長の異なる蛍光を発する、投写型表示装置。 - 請求項4に記載の蛍光体カラーホイルと、前記基板を回転駆動する回転駆動手段と、該蛍光体カラーホイルに対して励起光を照射する光源と、を含む照明光学系と、
前記照明光学系から入射した光を画像信号に合わせて変調するライトバルブと、
前記ライトバルブにて変調された光を外部のスクリーンに投写する投写光学系と、
を有し、
前記光源は、前記蛍光体カラーホイルの回転中に前記光源から照射された前記励起光の軌跡が、前記蛍光体カラーホイルの前記基板上で前記蛍光体の塗布領域と前記他の蛍光体の塗布領域とに跨って形成されるように配置されており、
前記蛍光体は、前記光源から前記励起光を照射されると該励起光と波長の異なる蛍光を発し、前記他の蛍光体は、前記光源から前記励起光を照射されると、該励起光と前記蛍光体により発せられる前記蛍光のいずれとも波長の異なる他の蛍光を発する、投写型表示装置。 - 前記基板と前記励起光を発する光源との相対位置を調整して、前記基板に対する前記励起光の照射位置を調整可能である、請求項5または6に記載の投写型表示装置。
- 表面に蛍光体が環状に塗布されている基板を回転させつつ、該基板に対して励起光を、前記蛍光体の塗布領域内と塗布領域外とに跨る軌跡を描くように照射して、前記蛍光体の塗布領域内に前記励起光が入射した時に、前記蛍光体によって、前記励起光と波長の異なる蛍光を発光させるとともに、前記蛍光体の塗布領域外に前記励起光が入射した時には、前記蛍光体による発光を行わせない、投写型表示方法。
- 表面に蛍光体が環状に塗布されているとともに、該蛍光体の塗布領域に隣接してその内側または外側に他の蛍光体が環状に塗布されている基板を回転させつつ、該基板に対して励起光を、前記蛍光体の塗布領域と前記他の蛍光体の塗布領域とに跨る軌跡を描くように照射して、前記蛍光体の塗布領域に前記励起光が入射した時に、前記蛍光体によって、前記励起光と波長の異なる蛍光を発光させるとともに、前記他の蛍光体の塗布領域に前記励起光が入射した時に、前記他の蛍光体によって、前記励起光と前記蛍光体により発せられる前記蛍光のいずれとも波長の異なる他の蛍光を発光させる、投写型表示方法。
- 前記基板と前記励起光を発する光源との相対位置を調整して、前記基板に対する前記励起光の照射位置を調整する、請求項8または9に記載の投写型表示方法。
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