JP2008052070A - Color wheel, visible light source, and projection image display device and method - Google Patents

Color wheel, visible light source, and projection image display device and method Download PDF

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Publication number
JP2008052070A
JP2008052070A JP2006228664A JP2006228664A JP2008052070A JP 2008052070 A JP2008052070 A JP 2008052070A JP 2006228664 A JP2006228664 A JP 2006228664A JP 2006228664 A JP2006228664 A JP 2006228664A JP 2008052070 A JP2008052070 A JP 2008052070A
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Prior art keywords
light
light source
color wheel
visible light
phosphor layer
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JP2006228664A
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Japanese (ja)
Inventor
Hiromitsu Takenaka
Yoshitaka Terao
芳孝 寺尾
博満 竹中
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Samsung Electronics Co Ltd
三星電子株式会社Samsung Electronics Co.,Ltd.
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Priority to JP2006228664A priority Critical patent/JP2008052070A/en
Publication of JP2008052070A publication Critical patent/JP2008052070A/en
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    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03BAPPARATUS 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
    • G03B21/00Projectors or projection-type viewers; Accessories therefor
    • G03B21/14Details
    • G03B21/20Lamp housings
    • G03B21/2006Lamp housings characterised by the light source
    • G03B21/2033LED or laser light sources
    • G03B21/204LED or laser light sources using secondary light emission, e.g. luminescence or fluorescence

Abstract

<P>PROBLEM TO BE SOLVED: To provide a color wheel which can reduce the invisible light passing through it and improve the conversion of the invisible light into visible light in it, and also to provide a visible light source, and a projection image display device and method. <P>SOLUTION: This color wheel 110 receives light from an invisible light source 132. It has a phosphor layer 112 at the side of the light source when arranged in face to face with the light source to convert the invisible light from the light source into visible light, and an invisible light reflector layer 114 at the other side of the light source against the phosphor layer to reflect the invisible light but pass the visible light. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a color wheel, a visible light source, a projection type image display device, and a projection type image display method.

  A projection-type image display device is a device that irradiates an image display element with light emitted from a light source and projects an image on a screen. In the projection-type image display device, a color wheel is provided when converting light emitted from a light source into red, green, and blue visible light. This color wheel is a disk-like member on which a phosphor layer that converts light from a light source into visible light is formed, and is driven to rotate about the center of the circle.

  For example, Patent Document 1 discloses a projector device having a color wheel that is irradiated with light from an excitation semiconductor laser, and a notch filter that transmits light having a predetermined wavelength among light that has passed through the color wheel. ing. Patent Document 2 and Patent Document 3 describe a color wheel irradiated with ultraviolet light, and a wavelength selection film or a visible light reflection film that reflects light converted by the color wheel to the image display element side opposite to the light source. Is disclosed.

JP 2003-233123 A JP 2004-325874 A JP 2004-341105 A

  As shown in FIG. 1, when the light emitted from the light source of the projection-type image display device is ultraviolet light, the phosphor layer 12 formed on the color wheel is irradiated with ultraviolet light to convert the ultraviolet light into visible light. Exit. However, since the phosphor layer 12 that converts ultraviolet rays into visible rays transmits a part of the ultraviolet rays incident on the phosphor layer 12, the ultraviolet rays that have passed through the phosphor layer are image display elements installed after the color wheel. And reached the optical parts of the optical system. For this reason, there has been a problem that ultraviolet rays have an adverse effect on the image display element and the optical component, such as a reduction in life and image quality. In addition, FIG. 1 is explanatory drawing which shows the entrance / exit of the conventional fluorescent substance layer and an ultraviolet-ray and visible light.

  In addition, as shown in Patent Document 1, when an ultraviolet absorbing member such as a notch filter that absorbs ultraviolet rays that have passed through the phosphor layer is provided between the color wheel and the image display element, the phosphor layer is once transmitted. Since ultraviolet rays were removed without being used for visible light conversion, there was a problem that ultraviolet rays irradiated from a light source could not be effectively utilized. Furthermore, when it is going to improve the conversion efficiency from an ultraviolet-ray to visible light, since it was necessary to thicken a fluorescent substance layer, there existed a problem that manufacturing cost increased. Further, when the thickness of the phosphor layer is increased, the amount of visible light converted from ultraviolet light is absorbed by the phosphor layer, and thus the amount of visible light emitted from the phosphor layer is decreased. There was a problem.

  Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to reduce the invisible light transmitted through the color wheel, and to convert the invisible light into visible light in the color wheel. It is an object of the present invention to provide a new and improved color wheel, visible light source, projection-type image display device, and projection-type image display method capable of improving the above-mentioned.

  In order to solve the above-described problem, according to an aspect of the present invention, a color wheel that receives irradiation of invisible light from a light source of invisible light, and is positioned on a surface on the light source side when disposed opposite to the light source. A phosphor layer that converts invisible light emitted from the light source into visible light, and an invisible light that is located on the opposite side of the light source from the light source, reflects invisible light, and transmits visible light. A color wheel is provided, comprising a reflective layer.

  With such a configuration, the color wheel is irradiated with invisible light from a light source of invisible light, and when the color wheel is disposed opposite to the light source, the phosphor layer is positioned on the surface of the light source, and the invisible light reflective layer is Located on the opposite side of the light source. The phosphor layer converts invisible light irradiated from the light source into visible light, and the invisible light reflecting layer reflects invisible light and transmits visible light. As a result, invisible light transmitted through the color wheel is reduced, and each member installed after the color wheel is not adversely affected by the invisible light. The invisible light reflecting layer reflects invisible light, and invisible light enters the phosphor layer also from the invisible light reflecting layer side, so the amount of invisible light converted from invisible light to visible light increases, Conversion efficiency to visible light at the wheel is improved.

  The invisible light reflection layer may be in close contact with the phosphor layer. With this configuration, the invisible light reflection layer and the phosphor layer are in close contact with each other, and the invisible light reflected by the invisible light reflection layer surely enters the phosphor layer. Therefore, the conversion efficiency from invisible light to visible light in the color wheel is further improved.

  The invisible light is ultraviolet light, the invisible light reflecting layer is an ultraviolet reflecting layer that reflects ultraviolet light, and the phosphor layer can convert ultraviolet light into visible light. With this configuration, the light from the light source is ultraviolet light, and the ultraviolet light transmitted through the color wheel is reduced, so that each member installed after the color wheel does not have an adverse effect due to the ultraviolet light. Further, the ultraviolet reflection layer reflects the ultraviolet ray, and the ultraviolet ray is also incident on the phosphor layer from the ultraviolet reflection layer side, and the conversion efficiency from ultraviolet rays to visible rays is improved in the color wheel.

  The invisible light is infrared light, the invisible light reflecting layer is an infrared reflecting layer that reflects infrared light, and the phosphor layer can convert infrared light into visible light. With this configuration, the light from the light source is infrared, and the infrared transmitted through the color wheel is reduced. Further, the infrared reflection layer reflects infrared rays, and infrared rays are also incident on the phosphor layer from the infrared reflection layer side, so that the conversion efficiency from infrared rays to visible rays is improved in the color wheel.

  In order to solve the above problem, according to another aspect of the present invention, a light source that emits invisible light and a color wheel that receives irradiation of invisible light, when the light source is disposed opposite to the light source, Located on the side surface, the phosphor layer that converts invisible light emitted from the light source to visible light, and the phosphor layer located on the surface opposite to the light source, reflects the invisible light, and visible light There is provided a visible light source characterized by comprising a color wheel having an invisible light reflecting layer that transmits light.

  With this configuration, the light source emits invisible light, the color wheel receives invisible light, and when the color wheel is disposed to face the light source, the phosphor layer is positioned on the surface on the light source side, and the invisible light is emitted. The reflective layer is located on the surface opposite to the light source. The phosphor layer converts invisible light irradiated from the light source into visible light, and the invisible light reflecting layer reflects invisible light and transmits visible light. As a result, invisible light transmitted through the color wheel is reduced, and each member installed after the color wheel is not adversely affected by the invisible light. Also, the invisible light reflecting layer reflects invisible light and invisible light enters the phosphor layer also from the invisible light reflecting layer side, so the amount of invisible light converted from invisible light to visible light increases, Conversion efficiency to visible light at the wheel is improved.

  In order to solve the above problem, according to another aspect of the present invention, a light source that emits invisible light and a color wheel that receives irradiation of invisible light, when the light source is disposed opposite to the light source, Located on the side surface, the phosphor layer that converts invisible light emitted from the light source to visible light, and the phosphor layer located on the surface opposite to the light source, reflects the invisible light, and visible light A color wheel having an invisible light reflecting layer that transmits the light, an image display element that displays an image of visible light that has passed through the color wheel according to an image signal, and light that projects light reflected or transmitted by the image display element A projection type image display device comprising a projection unit is provided.

  With this configuration, the light source emits invisible light, the color wheel receives invisible light, and when the color wheel is disposed to face the light source, the phosphor layer is positioned on the surface on the light source side, and the invisible light is emitted. The reflective layer is located on the surface opposite to the light source. The phosphor layer converts invisible light irradiated from the light source into visible light, and the invisible light reflecting layer reflects invisible light and transmits visible light. Further, the image display element displays an image of visible light transmitted through the color wheel in accordance with the image signal, and the light projection unit projects the light reflected or transmitted by the image display element. As a result, invisible light passing through the color wheel is reduced, and image display elements and light projection means installed after the color wheel are not adversely affected by the invisible light. Also, the invisible light reflecting layer reflects invisible light and invisible light enters the phosphor layer also from the invisible light reflecting layer side, so the amount of invisible light converted from invisible light to visible light increases, Conversion efficiency to visible light at the wheel is improved.

  In order to solve the above problems, according to another aspect of the present invention, a light source that emits invisible light includes a phosphor layer and an invisible light reflection layer that are arranged to face the light source. The phosphor layer that irradiates the wheel and is located on the surface of the light source side converts a part of the invisible light into visible light, and transmits the other part of the invisible light, and is opposite to the light source with respect to the phosphor layer The invisible light reflection film located on the surface of the projection reflects the invisible light transmitted through the phosphor layer, and the phosphor layer converts the invisible light reflected by the invisible light reflection film into visible light. A mold image display method is provided.

  With this configuration, invisible light transmitted through the color wheel is reduced, and each member installed after the color wheel is not adversely affected by the invisible light. The invisible light reflecting layer reflects invisible light, and invisible light enters the phosphor layer also from the invisible light reflecting layer side, so the amount of invisible light converted from invisible light to visible light increases, Conversion efficiency to visible light at the wheel is improved.

  According to the present invention, invisible light transmitted through the color wheel can be reduced, and the conversion efficiency from invisible light to visible light in the color wheel can be improved.

  Exemplary embodiments of the present invention will be described below in detail with reference to the accompanying drawings. In addition, in this specification and drawing, about the component which has the substantially same function structure, duplication description is abbreviate | omitted by attaching | subjecting the same code | symbol.

(First embodiment)
First, the configuration of the projection type image display apparatus according to the first embodiment of the present invention will be described. FIG. 2 is a configuration diagram showing the projection type image display apparatus according to the present embodiment. FIG. 3 is a front view and a side view showing the color wheel according to the present embodiment.

  The reflective projection type image display apparatus 100 includes a visible light source 130 that emits visible light, a lens 140, a mirror 150, an image display element 160, and a projection lens 170. The visible light source 130 includes an ultraviolet light source 132 and a color wheel 110, and is a light source that irradiates each component such as the lens 140 and the image display element 160 with visible light.

The ultraviolet light source 132 is a light source that irradiates ultraviolet light on the color wheel 110 side that is disposed to face the ultraviolet light source 132. Examples of the ultraviolet light source 132 include lasers such as semiconductor lasers, SHG (second harmonic generation) lasers, gas lasers, and ultraviolet LEDs (light-emitting).
diode), a light emitting diode such as a near-ultraviolet LED, a high-pressure mercury lamp, or the like can be applied.

  The color wheel 110 is, for example, a disk-shaped member as shown in FIG. 3, and is rotated by a driving device (not shown) around the center of the circle, and emits visible light upon receiving ultraviolet light from the ultraviolet light source 132. To do. As shown in FIGS. 2 and 3, the color wheel 110 includes, for example, a phosphor layer 112, an ultraviolet reflection layer 114, a transparent substrate 116, and a shaft portion 118. Details of the configuration of the color wheel 110 will be described later.

  The lens 140 is disposed so as to face the visible light source 130, transmits the visible light emitted from the visible light source 130, and guides the visible light to the mirror 150 and the image display element 160 side. The mirror 150 is a plate-like member, for example, and reflects visible light emitted from the visible light source 130 through the lens 140 to the image display element 160.

  The image display element 160 is disposed so as to reflect the visible light emitted from the visible light source 130 toward the projection lens 170 side. The image display element 160 displays an image of the visible light emitted from the visible light source 130 according to the image signal input to the image display element 160. As the image display element 160, for example, a digital micromirror device (DMD), a liquid crystal on silicon (LCOS), or the like can be applied.

  The projection lens 170 projects the light reflected by the image display element 160 as an image on a screen (not shown). The projection lens 170 can adjust zoom and focus in order to sharpen the image projected on the screen.

  Next, the color wheel according to the present embodiment will be described. FIG. 4 is a side view showing the ultraviolet reflecting film and the transparent substrate according to the present embodiment. Moreover, FIG. 5 is explanatory drawing which shows the reflectance of the light in the ultraviolet reflective layer which concerns on this embodiment.

  As shown in FIG. 2, the phosphor layer 112 is positioned on the surface on the ultraviolet light source 132 side when the color wheel 110 is disposed opposite to the ultraviolet light source 132. Then, the phosphor layer 112 converts the ultraviolet light irradiated on one surface side from the ultraviolet light source 132 into visible light, and emits visible light from the other surface side. Further, as shown in FIG. 3, the phosphor layer 112 is composed of three phosphors, a red phosphor 112R, a green phosphor 112G, and a blue phosphor 112B. The red phosphor 112R, the green phosphor 112G, and the blue phosphor Each of the bodies 112B is arranged adjacent to each other.

The red phosphor 112R converts ultraviolet light into red visible light, the green phosphor 112G converts ultraviolet light into green visible light, and the blue phosphor 112B converts ultraviolet light into blue visible light. As the red phosphor 112R, for example, a phosphor such as (Y, Gd) BO 3 : Eu, Y (P, V) O 4 : Eu, or Y 2 O 2 S: Eu can be applied. Examples of the green phosphor 112G include Zn 2 SiO 4 : Mn, (Y, Gd) BO 3 : Tb, (Ba, Sr, Mg) O.aAl 2 O 3 : Mn, ZnO: Zn, or ZnS: Cu. It is possible to apply phosphors such as Au and Al. As the blue phosphor 112B, for example, a phosphor such as BaMgAl 10 O 17 : Eu, (Sr, Ca, Ba, Mg) 10 (PO 4 ) 6 Cl 2 : Eu, or ZnS: Ag can be applied. .

  Next, as shown in FIG. 2, the ultraviolet reflection layer 114 is positioned on the surface opposite to the ultraviolet light source 132 with respect to the phosphor layer 112 when the color wheel 110 is disposed opposite to the ultraviolet light source 132. The phosphor layer 112 is formed in close contact with the phosphor layer 112. The ultraviolet reflection layer 114 reflects ultraviolet rays and transmits visible light converted by the phosphor layer 112. By forming the phosphor layer 112 and the ultraviolet reflecting layer 114 in close contact with each other, the ultraviolet light reflected by the ultraviolet reflecting layer 114 is incident on the phosphor layer 112 again without being diffused.

  Further, as shown in FIG. 4, the ultraviolet reflecting layer 114 is formed by alternately laminating a plurality of low refractive index material thin films 120 and high refractive index material thin films 122 having different refractive indexes. The number of layers of the low refractive index material thin film 120 and the high refractive index material thin film 122 is about 5 to 9 layers, and sufficient reflectance for reflecting ultraviolet rays can be obtained. Note that the number of stacked layers varies depending on the wavelength of light to be reflected, and an effect of reflecting ultraviolet rays can be obtained even in a single layer. The low refractive index material thin film 120 and the high refractive index material thin film 122 are formed to have an optical thickness of λ / 4, where λ is the center wavelength of the wavelength range of the reflected light. Note that various thicknesses can be employed depending on the wavelength of light to be reflected, the reflectance, and the productivity of the ultraviolet reflecting layer 114, and it is not necessary that all the layers to be stacked have an optical thickness of λ / 4.

Further, as the material of the low refractive index material thin film 120 and the high refractive index material thin film 122, a material having a high transmittance of visible light and ultraviolet light can be used. As the low refractive index material thin film 120, for example, LiF, SiO 2 , MgF 2 , Na 3 AlF 6 or the like can be applied. Further, as the high refractive index material thin film 122, for example, Al 2 O 3 , HfO 2 , MgO, Nb 2 O 5 , Sb 2 O 3 , Ta 2 O 5 , or ZrO 2 can be applied. The ultraviolet reflecting layer 114 is formed by appropriately combining these materials. For example, SiO 2 is employed for the low refractive index material film 120, and a combination employing a Ta 2 O 5 in high refractive index material film 122. The high refractive index material thin film 122 is preferably made of a material that is not damaged by ultraviolet rays. Therefore, it is desirable not to employ TiO 2 or ZnS generally used as a high refractive index material as the high refractive index material thin film 122 according to the present embodiment.

  With the configuration described above, the ultraviolet reflection layer 114 of the color wheel 110 has a high reflectance in the ultraviolet region and a low reflectance in the visible light region, as shown in FIG. As a result, the ultraviolet light reflecting layer 114 reflects ultraviolet light, does not reflect visible light, and transmits visible light to the opposite side of the ultraviolet light source 132.

  As shown in FIG. 2, the transparent substrate 116 is a planar member. When the color wheel 110 is disposed opposite to the ultraviolet light source 132, the transparent substrate 116 is opposite to the ultraviolet light source 132 with respect to the ultraviolet reflection layer 114. It is located on the surface and is formed in close contact with the ultraviolet reflecting layer 114. The transparent substrate 116 maintains the shape of the entire color wheel 110 and transmits visible light converted by the phosphor layer 112.

  The shaft portion 118 is formed at the center of the circle on both surfaces of the color wheel 110, and a protrusion that supports the color wheel 110 is formed. Since the color wheel 110 is supported by the shaft portion 118, the color wheel 110 can rotate around the center of the circle of the color wheel 110.

  Next, the operation of the reflective projection type image display apparatus according to the first embodiment of the present invention will be described. First, the operation of the visible light source 130 will be described. First, the ultraviolet light source 132 irradiates ultraviolet rays to the color wheel 110 side. Ultraviolet rays enter the phosphor layer 112 of the color wheel 110, and part of the incident ultraviolet rays is converted into visible light by the phosphor layer 112. At this time, the color wheel 110 is supported by the shaft portion 118 and rotated around the center of the circle by a driving device (not shown), and ultraviolet rays are, for example, red phosphor 112R → green phosphor 112G → blue fluorescence. The phosphors are sequentially irradiated as in the case of the body 112B → the red phosphor 112R. As a result, red, green, and blue visible rays are time-divided from the phosphor layer 112 and emitted to the ultraviolet reflecting layer 114 side.

  In the phosphor layer 112, ultraviolet rays that are not converted into visible light are transmitted to the ultraviolet reflecting layer 114 side. The ultraviolet rays that have passed through the phosphor layer 112 are reflected by the ultraviolet reflecting layer 114 toward the phosphor layer 112. Thereafter, the ultraviolet rays reflected by the ultraviolet reflecting layer 114 enter the phosphor layer 112 and are converted into visible light by the phosphor layer 112. In the same manner as described above, red, green, and blue visible rays are time-divided from the phosphor layer 112 and emitted to the ultraviolet reflecting layer 114 side.

  Next, the ultraviolet reflection layer 114 transmits visible light converted by the phosphor layer 112 to the transparent substrate 116 side. Then, the visible light source 130 emits visible light to the mirror 150 and the image display element 160 side. Using the visible light converted from the ultraviolet light by the visible light source 130, the reflective projection-type image display device 100 causes the visible light to pass through the image display element 160 and to send the image to the outside as described below. Project.

  That is, the visible light beam emitted from the visible light source 130 passes through the lens 140, is reflected by the mirror 150, and enters the image display element 160. The image display element 160 displays an image according to the image signal input to the image display element 160 by reflecting visible light. Next, the projection lens 170 projects the light reflected by the image display element 160 onto an external screen, and displays an image on the screen.

  Next, the effect of this embodiment is demonstrated. FIG. 6 is an explanatory diagram showing the phosphor layer according to the present embodiment and the entrance and exit of ultraviolet rays and visible rays. According to the present embodiment, as shown in FIG. 6, a part of the ultraviolet light incident from the ultraviolet light source 132 passes through the phosphor layer 112, but the transmitted ultraviolet light is reflected by the ultraviolet reflection layer 114. Therefore, the ultraviolet rays that pass through the color wheel 110 are reduced. Accordingly, since the ultraviolet rays do not reach the image display element 160, the lifetime of the image display element 160 and the image quality deterioration due to the ultraviolet rays are eliminated. Further, since the ultraviolet rays do not reach the optical members such as the lens 140, the mirror 150, and the projection lens 170 disposed after the color wheel 110, the deterioration of these optical members due to the ultraviolet rays is eliminated.

  Furthermore, according to the present embodiment, ultraviolet rays are reflected by the ultraviolet reflecting layer 114 and enter the phosphor layer 112 again. Therefore, among the ultraviolet rays irradiated from the ultraviolet light source 132, the ultraviolet rays that are converted into visible rays by the phosphor layer 112 increase, and the conversion efficiency from the ultraviolet rays to the visible rays in the color wheel 110 is improved. Further, since the ultraviolet rays are reflected by the ultraviolet reflecting layer 114 and enter the phosphor layer 112 again, the thickness of the phosphor layer 112 can be reduced as compared with the conventional technique in which the ultraviolet rays enter the phosphor layer only once. UV light can be efficiently converted into visible light. As a result of making the phosphor layer 112 thinner, the distance through which visible light passes through the phosphor layer 112, that is, the distance at which visible light is attenuated by the phosphor layer 112 is shortened. Therefore, in the present embodiment, the amount of visible light emitted from the color wheel 110 can be increased. Moreover, since the phosphor layer 112 can be thinned, the manufacturing cost of the phosphor layer 112 can be reduced.

  Next, the conversion efficiency from ultraviolet rays to visible rays in the color wheel 110 according to the present embodiment will be specifically described. For example, when the phosphor layer 112 has an ultraviolet transmittance of 10%, the phosphor layer 112 has a visible light transmittance of 70%, and the ultraviolet reflector layer 114 has an ultraviolet reflectance of 100%, the above-described color The conversion efficiency from ultraviolet rays to visible rays at the wheel 110 is improved by 11.4%. For example, when the phosphor layer 112 has an ultraviolet transmittance of 20%, the phosphor layer 112 has a visible light transmittance of 90%, and the ultraviolet reflection layer 114 has an ultraviolet reflectance of 95%, The conversion efficiency from ultraviolet rays to visible rays in the color wheel 110 is improved by 19.5%. As described above, since the color wheel 110 includes the ultraviolet reflection layer 114 having a high ultraviolet reflectance, even if the ultraviolet ray is transmitted through the phosphor layer 112, the ultraviolet ray is reflected by the ultraviolet reflection layer 114, and again the phosphor layer 112. Therefore, it can be seen that the conversion efficiency from ultraviolet rays to visible rays in the color wheel 110 is improved.

(Second Embodiment)
Next, a projection type image display device according to a second embodiment of the present invention will be described. FIG. 7 is a configuration diagram showing the projection type image display apparatus according to the present embodiment. FIG. 8 is an explanatory diagram showing the reflectance of light in the infrared reflecting layer according to the present embodiment.

  In the present embodiment described above, the invisible light source is ultraviolet light. In the second embodiment, as shown in FIG. 7, the invisible light source is an infrared light source 232 that emits infrared light, and the color wheel 210. The invisible light reflecting layer is an infrared reflecting layer 214 that reflects infrared rays, and a phosphor layer 212 that converts infrared rays into visible light is applied as the phosphor layer. The other components of the projection type image display apparatus according to this embodiment are the same as those in the first embodiment, and detailed description thereof is omitted.

  First, the configuration of the visible light source 230 according to the present embodiment will be described. The visible light source 230 includes an infrared light source 232 and a color wheel 210, and is a light source that irradiates each component such as the lens 140 and the image display element 160 with visible light. The infrared light source 232 is disposed in a direction in which the color wheel 210 is irradiated with infrared light.

  The infrared light source 232 is a light source that irradiates infrared light to the color wheel 210 side that is disposed to face the infrared light source 232. As the infrared light source 232, for example, a laser such as a semiconductor laser or a gas laser, a light-emitting diode (LED), a halogen lamp, or the like can be used.

  The color wheel 210 is a disk-like member, for example, as in the first embodiment shown in FIG. 3, and is rotated around the center of the circle by a driving device (not shown) to transmit infrared light from the infrared light source 232. Receives visible light upon irradiation. As shown in FIG. 7, the color wheel 210 includes, for example, a phosphor layer 212, an infrared reflection layer 214, a transparent substrate 116, and a shaft portion 118.

  Next, the color wheel according to the present embodiment will be described. As shown in FIG. 7, the phosphor layer 212 is positioned on the surface on the infrared light source 232 side when the color wheel 210 is disposed opposite to the infrared light source 232. Then, the phosphor layer 212 converts the infrared light irradiated on the one surface side from the infrared light source 232 into visible light, and emits the visible light from the other surface side. Further, the phosphor layer 212 has a red phosphor (not shown), a green phosphor (not shown), and a blue phosphor (not shown) as in the first embodiment shown in FIG. The red phosphor, the green phosphor, and the blue phosphor are arranged adjacent to each other.

The red phosphor converts infrared light into red visible light, the green phosphor converts infrared light into green visible light, and the blue phosphor converts infrared light into blue visible light. For each phosphor, an up-conversion phosphor can be applied, for example, a rare earth ion-containing transparent crystallized glass. As the red phosphor, for example, a rare-earth ion-containing transparent crystallized glass doped with Yb 3+ , Eu 3+ , and Tm 3+ can be applied. As the green phosphor, for example, a rare-earth ion-containing transparent crystallized glass doped with Eu 3+ can be applied. As the blue phosphor, for example, rare earth ion-containing transparent crystallized glass doped with Yb 3+ and Tm 3+ can be applied.

  As shown in FIG. 7, the infrared reflection layer 214 is positioned on the surface opposite to the infrared light source 232 with respect to the phosphor layer 212 when the color wheel 210 is disposed opposite to the infrared light source 232. , Formed in close contact with the phosphor layer 212. The infrared reflection layer 214 reflects infrared rays and transmits visible light converted by the phosphor layer 212. Further, as in the first embodiment shown in FIG. 4, the infrared reflective layer 214 includes a low refractive index material thin film (not shown) and a high refractive index material thin film (not shown) having different refractive indexes. A plurality of layers are alternately stacked. The configuration of the infrared reflective layer 214 is the same as that of the ultraviolet reflective layer 114 according to the first embodiment, and a detailed description thereof will be omitted.

In addition, as the material of the low refractive index material thin film and the high refractive index material thin film, a material having a high transmittance of visible light and infrared light can be used. As the low refractive index material thin film, for example, LiF, SiO 2 , MgF 2 , Na 3 AlF 6 or the like can be applied. As the high refractive index material thin film, for example, Al 2 O 3 , HfO 2 , MgO, Nb 2 O 5 , Sb 2 O 3 , Ta 2 O 5 , or ZrO 2 can be applied. In the present embodiment, since ultraviolet rays are not irradiated, the high refractive index material thin film is easily damaged by the ultraviolet rays, and TiO 2 or ZnS that is difficult to adopt in the first embodiment can also be applied. The infrared reflecting layer 214 is formed by appropriately combining the above materials. For example, SiO 2 is employed for the low refractive index material film, and a combination employing a Ta 2 O 5 in high refractive index material film.

  With the configuration described above, the infrared reflection layer 214 of the color wheel 210 has a high reflectance in the infrared region and a low reflectance in the visible light region, as shown in FIG. As a result, the infrared reflection layer 214 reflects infrared light, does not reflect visible light, and transmits visible light to the opposite side of the infrared light source 232.

  Next, the operation of the reflective projection type image display apparatus according to the second embodiment of the present invention will be described. In the present embodiment, since the visible light source 230 is different from the visible light source 130 of the first embodiment, only the operation of the visible light source 230 will be described, and the visible light emitted from the visible light source 230 is converted to an external screen. The process of projecting an image on the screen will be omitted.

  First, the infrared light source 232 irradiates infrared rays to the color wheel 210 side. Infrared rays enter the phosphor layer 212 of the color wheel 210, and part of the incident infrared rays is converted into visible light by the phosphor layer 212. At this time, the color wheel 210 is supported by the shaft portion 118 and rotated about the center of the circle by a driving device (not shown), and infrared light is, for example, red phosphor → green phosphor → blue fluorescence. Each phosphor is irradiated in order, such as body → red phosphor. As a result, red, green, and blue visible rays are time-divided from the phosphor layer 212 and emitted to the infrared reflecting layer 214 side.

  Further, in the phosphor layer 212, the remainder of the infrared rays that are not converted to visible light passes through the infrared reflection layer 214 side. The infrared reflection layer 214 reflects the infrared light transmitted through the phosphor layer 212 to the phosphor layer 212 side. Thereafter, infrared light reflected by the infrared reflecting layer 214 enters the phosphor layer 212 and is converted into visible light by the phosphor layer 212. In the same manner as described above, red, green, and blue visible rays are time-divided from the phosphor layer 212 and emitted to the infrared reflecting layer 214 side.

  According to the present embodiment, a part of the infrared light incident from the infrared light source 232 passes through the phosphor layer 212, but the transmitted infrared light is reflected by the infrared reflection layer 214. Therefore, the infrared rays that pass through the color wheel 210 are reduced. In addition, among the infrared rays irradiated from the infrared light source 232, the infrared rays that are converted into visible light by the phosphor layer 212 are increased, and the conversion efficiency from the infrared light to the visible light in the color wheel 210 is improved. Furthermore, since infrared rays are reflected by the infrared reflecting layer 214 and enter the phosphor layer 212 again, the thickness of the phosphor layer 212 can be reduced compared to the conventional technique in which infrared rays enter the phosphor layer only once. Infrared rays can be efficiently converted into visible rays. As a result of making the phosphor layer 212 thinner, the distance through which visible light passes through the phosphor layer 212, that is, the distance at which visible light is attenuated by the phosphor layer 212 is shortened. Therefore, in the present embodiment, the amount of visible light emitted from the color wheel 210 can be increased. Moreover, since the phosphor layer 212 can be made thin, the manufacturing cost of the phosphor layer 212 can be reduced.

  As mentioned above, although preferred embodiment of this invention was described referring an accompanying drawing, it cannot be overemphasized that this invention is not limited to this example. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims, and these are naturally within the technical scope of the present invention. Understood.

  For example, in the above-described embodiment, the projection-type image display devices 100 and 200 are configured to include the mirror 150, but the present invention is not limited to this example, and the mirror 150 may not be included. At this time, visible light emitted from the visible light sources 130 and 230 is applied to the image display element 160 without passing through a mirror. Thereafter, visible light is reflected by the image display element 160 and an image is projected on the screen.

  Further, in the above embodiment, the phosphor layer 112 is configured by three regions of the red phosphor 112R, the green phosphor 112G, and the blue phosphor 112B as shown in FIG. It is not limited to such an example. For example, the phosphor layer may further include a white phosphor and may be composed of four regions. Further, the red phosphor, the green phosphor, and the blue phosphor each have two regions, and may be composed of a total of six regions. This modification can also be applied to the phosphor layer 212 according to the second embodiment.

  Moreover, in the said embodiment, although the transparent substrate 116 was set as the structure closely_contact | adhered to the ultraviolet reflective layer 114 and the infrared reflective layer 214 in FIG.2 and FIG.3, this invention is not limited to this example. For example, the transparent substrate may be formed in close contact with the phosphor layer, and may be positioned on the light source side surface with respect to the phosphor layer when the color wheel is disposed to face the invisible light source. Good.

  In the above-described embodiment, the case where the ultraviolet light source 132 or the infrared light source 232 is applied as the invisible light source has been described. However, the invisible light source is the ultraviolet light source 132 or infrared light. A light source including the light source 232 or a light source that irradiates both ultraviolet rays and infrared rays may be used. At this time, the phosphor layer of the color wheel converts both ultraviolet rays and infrared rays into visible rays, and the invisible ray reflecting layer reflects both ultraviolet rays and infrared rays.

  In the above embodiment, as shown in FIGS. 2 and 3, the color wheel 110 is composed of, for example, the phosphor layer 112, the ultraviolet reflecting layer 114, the transparent substrate 116, and the shaft portion 118. As shown in FIG. 9A, the visible light reflection layer 115 is further provided so as to face the ultraviolet light source 132 when it is in contact with the phosphor layer 112 and opposed to the ultraviolet light source 132. Also good. FIG. 9 is a side view showing a modified example of the color wheel according to the first embodiment of the present invention. FIG. 10A and FIG. 10B are explanatory diagrams showing the reflectance of light in the visible light reflection layer according to this embodiment. As shown in FIG. 10A (a), the visible light reflection layer 115 has a low reflectance in the ultraviolet region, and a high reflectance in the visible light and infrared region. Therefore, in the visible light reflection layer 115, ultraviolet rays are transmitted without being reflected, and visible rays and infrared rays are reflected. As a result, in the color wheel 110 according to this modified example corresponding to the ultraviolet light source 132, even if the visible light converted by the phosphor layer 112 is emitted to the ultraviolet light source 132 side, the visible light reflecting layer 115 Reflected. That is, the visible light is prevented from returning to the ultraviolet light source 132 side, and the amount of light emitted from the surface opposite to the ultraviolet light source 132 increases, so that the visible light extraction efficiency of the color wheel 110 according to this modification is increased. To rise.

  In the above-described modification of the color wheel, the visible light reflection layer 115 is in contact with the phosphor layer 112, but the present invention is not limited to this. That is, as shown in FIG. 9B, the one in which the visible light reflecting layer 115 is formed on the transparent substrate 117 and the one in which the ultraviolet reflecting layer 114 and the phosphor layer 112 are formed on the transparent substrate 116. Alternatively, the adhesive layer 119 may be in close contact with each other. With this configuration, the transparent substrate 116 side and the transparent substrate 117 side can be separately manufactured in parallel in the manufacturing process.

  Furthermore, the above-described modification of the color wheel is a color wheel including a phosphor layer 212 corresponding to the infrared light source 232, an infrared reflection layer 214, a transparent substrate 116, a shaft portion 118, and a visible light reflection layer. It can also be 210. Similar to the configuration of the visible light reflection layer 115 described above, the visible light reflection layer corresponding to the infrared light source 232 is in contact with the phosphor layer 212 and is disposed so as to face the infrared light source 232. It is provided so as to face the light source 232. At this time, as shown in FIG. 10A (b), the visible light reflection layer has a low reflectance in the infrared region, and a high reflectance in the visible light and ultraviolet region. Therefore, even in the color wheel according to this modification corresponding to the infrared light source 232, the visible light is prevented from returning to the infrared light source 232 side, and the amount emitted from the surface opposite to the infrared light source 232. Therefore, the visible light extraction efficiency of the color wheel according to this modification increases. Similarly, the present invention can also be applied to a color wheel when the invisible light source is a light source that emits both ultraviolet rays and infrared rays. As shown in FIG. 10B (c), the visible light reflection layer at this time has a low reflectance in the ultraviolet and infrared regions, and a high reflectance in the visible light region.

  Moreover, in the said embodiment, although the projection type image display apparatuses 100 and 200 using the reflection type image display element 160 were demonstrated, this invention is not limited to this example, For example, as shown in FIG. The present invention can be applied to a projection type image display apparatus using a transmission type image display element 360. FIG. 11 is a configuration diagram showing a modification of the projection type image display device according to the first embodiment of the present invention. The transmissive projection-type image display apparatus 300 according to this modification example does not use the image display element 160 according to the above embodiment, but uses an image display element 360 as shown in FIG. The image display element 360 transmits visible light emitted from the visible light source 130 and displays an image according to an image signal input to the image display element 360. The light displayed by the image display element 360 is displayed on an external screen via the projection lens 170. As the image display element 360, for example, transmissive liquid crystal such as HTPS-LCD (high temperature poly-silicon LCD) can be applied. In this modification, the color wheel 110, the ultraviolet light source 132, and the visible light source 130 shown in FIG. 11 are replaced with the color wheel 210, the infrared light source 232, and the visible light source according to the second embodiment of the present invention, respectively. 230 can be used as a transmissive projection type image display device.

It is explanatory drawing which shows the entrance / exit of the conventional fluorescent substance layer and an ultraviolet-ray and visible light. It is a block diagram which shows the projection type image display apparatus which concerns on the 1st Embodiment of this invention. It is the front view and side view which show the color wheel which concerns on the same embodiment. It is a side view which shows the ultraviolet reflective film and transparent substrate which concern on the same embodiment. It is explanatory drawing which shows the reflectance of the light in the ultraviolet reflective layer which concerns on the embodiment. It is explanatory drawing which shows the entrance / exit of the fluorescent substance layer which concerns on the embodiment, and an ultraviolet-ray and visible light. It is a block diagram which shows the reflection type projection type image display apparatus which concerns on the 2nd Embodiment of this invention. It is explanatory drawing which shows the reflectance of the light in the infrared reflective layer which concerns on the same embodiment. It is a side view which shows the example of a change of the color wheel which concerns on the 1st Embodiment of this invention. It is explanatory drawing which shows the reflectance of the light in the visible light reflection layer which concerns on the embodiment. It is explanatory drawing which shows the reflectance of the light in the visible light reflection layer which concerns on the embodiment. It is a block diagram which shows the example of a change of the projection type image display apparatus concerning the embodiment.

Explanation of symbols

100, 200, 300 Projection type image display device 110, 210 Color wheel 112, 212 Phosphor layer 112R Red phosphor 112G Green phosphor 112B Blue phosphor 114 Ultraviolet reflection layer 116 Transparent substrate 118 Shaft portion 120 Low refractive index material thin film 122 High refractive index material thin film 130, 230 Visible light source 132 Ultraviolet light source 140 Lens 150 Mirror 160, 360 Image display element 170 Projection lens 214 Infrared reflective layer 232 Infrared light source

Claims (7)

  1. A color wheel that receives the invisible light from a light source of invisible light:
    A phosphor layer that is positioned on the surface of the light source and that converts the invisible light emitted from the light source into visible light when disposed opposite to the light source;
    An invisible light reflecting layer that is located on a surface opposite to the light source with respect to the phosphor layer, reflects the invisible light, and transmits the visible light;
    A color wheel comprising:
  2.   The color wheel according to claim 1, wherein the invisible light reflection layer is in close contact with the phosphor layer.
  3. The invisible light is ultraviolet light;
    The invisible light reflection layer is an ultraviolet reflection layer that reflects the ultraviolet rays,
    The color wheel according to claim 1, wherein the phosphor layer converts the ultraviolet light into visible light.
  4. The invisible light is infrared;
    The invisible light reflection layer is an infrared reflection layer that reflects the infrared rays,
    The color wheel according to claim 1, wherein the phosphor layer converts the infrared light into visible light.
  5. A light source that emits invisible light;
    A color wheel that receives irradiation of the invisible light, and is disposed on the surface of the light source when opposed to the light source, and converts the invisible light irradiated from the light source into visible light. And a color wheel having an invisible light reflecting layer that is located on a surface opposite to the light source with respect to the phosphor layer, reflects the invisible light, and transmits the visible light;
    A visible light source characterized by comprising:
  6. A light source that emits invisible light;
    A color wheel that receives irradiation of the invisible light, and is disposed on the surface of the light source when opposed to the light source, and converts the invisible light irradiated from the light source into visible light. And a color wheel having an invisible light reflecting layer that is located on a surface opposite to the light source with respect to the phosphor layer, reflects the invisible light, and transmits the visible light;
    An image display element for displaying an image of the visible light transmitted through the color wheel in accordance with an image signal;
    Light projection means for projecting light reflected or transmitted by the image display element;
    A projection type image display device comprising:
  7. A light source that irradiates invisible light irradiates the invisible light to a color wheel having a phosphor layer and an invisible light reflecting layer disposed opposite to the light source,
    The phosphor layer located on the surface on the light source side converts a part of the invisible light into visible light and transmits the rest of the invisible light,
    The invisible light reflecting film located on the surface opposite to the light source with respect to the phosphor layer reflects invisible light transmitted through the phosphor layer,
    The projection type image display method, wherein the phosphor layer converts invisible light reflected by the invisible light reflection film into visible light.
JP2006228664A 2006-08-25 2006-08-25 Color wheel, visible light source, and projection image display device and method Withdrawn JP2008052070A (en)

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KR1020060100007A KR100823284B1 (en) 2006-08-25 2006-10-13 Color wheel, visible ray source, projection type image display apparatus, and method of displaying image
KR1020070043791A KR100846805B1 (en) 2006-08-25 2007-05-04 Color wheel, visible light source, projective image display apparatus, and projective image display method

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