COLOR WHEEL UNIT, LIGHT SOURCE DEVICE, AND PROJECTION DISPLAY APPARATUS

A color wheel unit includes a color wheel assembly, a rod integrator, and a holder. The holder includes a first base attached to a housing of a projection display apparatus, a second base protruding from the first base, and a third base further protruding from the second base and to which the rod integrator is attached. The third base includes a first guide wall and a second guide wall that guide the color wheel assembly. The color wheel assembly includes the color wheel, a motor that rotationally drives the color wheel, and a support part that rotatably supports the color wheel. The support part includes a first restricting part whose movement is restricted and guided by the first guide wall, and a second restricting part whose movement is restricted and guided by the second guide wall when the color wheel assembly is attached to the holder.

BACKGROUND

1. Technical Field

The present invention relates to a color wheel unit, a light source device, and a projection display apparatus.

2. Description of the Related Art

Conventionally, in order to align a color wheel and a rod integrator, a color wheel unit in which the color wheel and the rod integrator are integrated has been proposed.

For example, PTL (Patent Literature)1has devised a color wheel assembly in which a color wheel and a light guide are integrated.

Further, PTL 2 has proposed a light source device in which a dichroic film that reflects blue light is disposed on a color wheel to cut the blue light.

PTL 1 is Japanese Utility Model No. 3099869. PTL 2 is Unexamined Japanese Patent Publication No. 2017-167528.

SUMMARY

However, when the color wheel and the rod integrator as a light guide are assembled, the color wheel and the rod integrator may be brought into contact with each other and damaged.

An object of the present disclosure is to provide a color wheel unit, a light source device, and a projection display apparatus in which assemblability between a color wheel and a rod integrator is improved.

A color wheel unit according to the present disclosure includes a color wheel assembly having a color wheel, a rod integrator where light having passed through the color wheel is incident, and a holder to which the color wheel assembly and the rod integrator are attached. The holder includes a first base attached to a housing of a projection display apparatus, a second base protruding from the first base, and a third base further protruding from the second base and to which the rod integrator is attached. The third base includes a first guide wall and a second guide wall that guide the color wheel assembly when the color wheel assembly is attached to the holder. The color wheel assembly includes a motor that is coupled to the color wheel and rotationally drives the color wheel, and a support part that rotatably supports the color wheel. The support part includes a first restricting part whose movement is restricted and guided by the first guide wall, and a second restricting part whose movement is restricted and guided by the second guide wall when the color wheel assembly is attached to the holder.

The present disclosure can provide a color wheel unit, a light source device, and a projection display apparatus in which assemblability between a color wheel and a rod integrator is improved.

DETAILED DESCRIPTIONS

Exemplary embodiments will be described in detail below with reference to the drawings as appropriate. However, unnecessarily detailed description may be omitted. For example, the detailed description of already well-known matters and the overlap description of substantially same configurations may be omitted. This is to avoid an unnecessarily redundant description below and to facilitate understanding by those skilled in the art.

Note that, the accompanying drawings and the following description are provided for those skilled in the art to fully understand the present disclosure, and are not intended to limit the subject matter described in the claims.

FIRST EXEMPLARY EMBODIMENT

[1-1. Configuration of Projection Display Apparatus]

Projection display apparatus1according to a first exemplary embodiment will be described with reference toFIG.1.FIG.1is a diagram illustrating a configuration of projection display apparatus1according to the first exemplary embodiment.

As illustrated inFIG.1, light source device3of the first exemplary embodiment is, for example, a light source device for a one-chip DMD type projection display apparatus using one digital micromirror device (DMD). Light source device3includes laser light sources11, phosphor wheel5, color wheel unit20, and controller7. Laser light in a blue wavelength region emitted from the plurality of laser light sources11is collimated by a plurality of collimator lenses (not illustrated) provided corresponding to laser light sources11. The collimated blue light is incident on convex lens13in a subsequent stage, a light flux width thereof is reduced, and the blue light is incident on subsequent diffuser plate14and diffused, so that uniformity of the light is improved. The blue light having improved uniformity of light is incident on concave lens15in the subsequent stage and is converted into parallel light flux.

The blue light collimated by concave lens15enters selective reflection element16disposed at an angle of approximately 45 degrees with respect to an optical axis, travels straight, and enters convex lens17. Selective reflection element16has a spectral characteristic of reflecting light in a wavelength range of fluorescent light that passes light in a wavelength range of blue light emitted from laser light sources11and is wavelength-converted by phosphor wheel5using the blue light from laser light sources11as excitation light. Selective reflection element16is, for example, a dichroic mirror.

The blue light incident on convex lens17is incident on wavelength conversion element92or passing region93disposed in an annular region on substrate91of phosphor wheel5(seeFIG.10) at the subsequent stage in combination with convex lens18at the subsequent stage. Phosphor wheel5is disposed such that the blue excitation light condensed by convex lenses17,18is incident on annular wavelength conversion element92or passing region93around a rotation shaft of the phosphor wheel. Phosphor wheel5is provided with a sensor (not illustrated) that detects a rotation phase of a motor that rotationally drives phosphor wheel5. A detection signal detected by this sensor is transmitted to controller7.

As illustrated inFIG.1, the blue light condensed on wavelength conversion element92of phosphor wheel5by convex lenses17,18is wavelength-converted into fluorescent light, and is incident on convex lenses18,17again in this order to be collimated after a traveling direction of the light is changed by 180 degrees. The fluorescent light subjected to wavelength conversion here is, for example, green light and yellow light.

The collimated fluorescent light emitted from convex lens17is incident on selective reflection element16again. As described above, since selective reflection element16has a characteristic of reflecting the light in the fluorescent light wavelength region, a direction of the light in the fluorescent light wavelength region is changed by 90 degrees and made incident on the convex lens39.

Next, the blue light from laser light sources11condensed on passing region93of phosphor wheel5passes through phosphor wheel5, and is collimated by convex lenses31,32at the subsequent stage. Thereafter, light is guided to selective reflection element16by a relay lens system including three reflection mirrors33,35,37and three convex lenses34,36,38provided at the subsequent stage such that light is collimated from a direction at which light from laser light sources11is incident from a direction at an angle of 90 degrees with respect to the direction. Note that, here, the relay optical system includes three mirrors and three convex lenses, but other configurations may be used as long as they have similar performance.

The blue light incident on selective reflection element16from convex lens38passes through selective reflection element16and travels straight.

With the above configuration, the fluorescent light and the blue light are time-divided and incident on convex lens39.

The time-divided fluorescent light and blue light incident on convex lens39from selective reflection element16are condensed by convex lens39and incident on color wheel22of color wheel unit20in the subsequent stage. Color wheel22is controlled by controller7to rotate synchronously with phosphor wheel5, and a plurality of filters having a characteristic of transmitting a part or the entire wavelength range of blue light and fluorescent light are attached in accordance with a characteristic of the optical system. Controller7can be implemented by a semiconductor element or the like. Controller7may be configured with, for example, a microcomputer, a central processing unit (CPU), a microprocessor unit (MPU), a graphics processor unit (GPU), a digital signal processor (DSP), a field-programmable gate array (FPGA), or an application specific integrated circuit (ASIC). Controller7reads data and programs stored in a built-in storage unit (not illustrated) and performs various arithmetic processing, thereby implementing a predetermined function. The storage unit can be implemented by, for example, a hard disk (HDD), a solid state drive (SSD), a random access memory (RAM), a dynamic random access memory (DRAM), a ferroelectric memory, a flash memory, a magnetic disk, or a combination thereof.

For example, with respect to a time zone in which yellow fluorescent light is emitted from phosphor wheel5, color wheel22having at least one region among a region in which the wavelength region of the fluorescent light is transmitted as it is, a region in which light of a red part in the fluorescent light is reflected and green light is transmitted, a region in which light of a green part in the fluorescent light is reflected and red light is transmitted, and the like rotates in synchronization. Further, since the region of color wheel22that transmits the wavelength region of the blue light as it is corresponds to the blue light having passed through the passing region of phosphor wheel5, color lights having different wavelength regions of light are condensed in time series in the vicinity of an incident end of rod integrator23.

The light incident on rod integrator23of color wheel unit20is uniformed by rod integrator23, and the uniformed light is emitted from an emission end thereof.

Note that in the first exemplary embodiment, color wheel22is disposed in front of rod integrator23, but may be disposed behind rod integrator23.

As illustrated inFIG.1, projection display apparatus1of the first exemplary embodiment is, for example, a so-called one-chip type DMD projector using one DMD. Projection display apparatus1includes light source device3.

The light emitted from rod integrator23is mapped to DMD51described later by a relay lens system including convex lenses41,42,43.

The light that has passed through convex lenses41,42,43and entered total reflection prism44enters minute gap45of total reflection prism44at an angle larger than or equal to a total reflection angle, and is reflected to change the traveling direction of the light and enter DMD51.

DMD51changes a direction of a micromirror according to a signal from an image circuit (not illustrated) synchronized with the color light emitted by the combination of phosphor wheel5and color wheel22, and emits the light while changing the traveling direction of the light.

The light whose traveling direction is changed by DMD51according to the image signal is incident on total reflection prism44, incident on minute gap45of total reflection prism44at an angle less than or equal to the total reflection angle, transmitted as it is, incident on projection lens unit55, and projected on a screen (not illustrated).

[1-2. Configuration of Color Wheel Unit]

Hereinafter, color wheel unit20according to the first exemplary embodiment will be described with reference toFIGS.2to6.FIG.2is an outer appearance perspective view of color wheel unit20.FIG.3is a bottom view of color wheel unit20.FIG.4is a side view of color wheel unit20.FIGS.5and6are outer appearance perspective views of the color wheel unit. Note that in each drawing, a plane on which color wheel22receives light is an XY plane, and a direction orthogonal to the XY plane is a Z-direction.

Color wheel unit20includes color wheel assembly21having color wheel22, rod integrator23on which light passing through color wheel22is incident, and holder24to which color wheel assembly21and rod integrator23are attached. As illustrated inFIG.7orFIG.8, color wheel unit20is attached to housing2as a lid of opening2aso that color wheel assembly21and rod integrator23are accommodated in housing2from opening2aformed in housing2of projection display apparatus1.

Holder24is made of metal, and is formed by, for example, die-casting aluminum. Holder24includes first base71attached to housing2of projection display apparatus1, second base72protruding from first base71to one side, that is, to an inside of housing2to which holder24is attached, and third base73further protruding from second base72to one side and to which rod integrator23is attached.

Third base73has a trapezoidal shape having a two-stage configuration at an upper part. Third base73includes planar placement part73aon which one surface of rod integrator23is placed, and first wall part73brising from placement part73a. A wall surface of first wall part73bon a side of color wheel22is erected from second base72. A side surface of rod integrator23abuts on a part of a side surface of first wall part73bon a side opposite to color wheel22. Rod integrator23is pressed against placement part73aand first wall part73b, and is fixed to third base73by fastener76.

Third base73includes first guide wall74and second guide wall75that guide color wheel assembly21when color wheel assembly21is attached to holder24. First guide wall74is formed on first wall part73bon a side of rotation shaft Ar of motor81of color wheel22. First guide wall74is a surface in which a part of first wall part73b, which is mostly an inclined surface, on the side of rotation shaft Ar is formed as a vertical surface.

Second guide wall75is formed in second wall part73cin which third base73extends toward color wheel22. The second guide wall has a semi-cylindrical shape and restricts movement in an X-direction and the Z-direction.

Color wheel assembly21includes motor81that is coupled to color wheel22and rotationally drives color wheel22, and support part82that rotatably supports color wheel22. Color wheel22is integrated with motor81, and support part82supports color wheel22by supporting rotation shaft81aof motor81.

Support part82includes bottom surface82aattached to second base72, wall part82bstanding upright from bottom surface82a, and upper surface82cextending parallel to bottom surface82afrom wall part82b. When color wheel assembly21is attached to holder24, support part82includes first restricting part83whose movement is restricted and guided by first guide wall74, and second restricting part84whose movement is restricted and guided by second guide wall75.

First restricting part83is, for example, an inverted L-shaped flat plate, and first guide wall74is a parallel plane facing first restricting part83. Therefore, the movement of color wheel assembly21in a negative direction of an X axis can be restricted by pressing first restricting part83against first guide wall74.

Second restricting part84has a convex shape, for example, a semicircular shape. Since second guide wall75has a concave shape fitted with second restricting part84, second restricting part84is fitted with second guide wall75, so that color wheel assembly21can be restricted from moving in an X-axis direction and a positive direction of a Z-axis.

As described above, since color wheel assembly21is appropriately guided to holder24by the combination of first guide wall74and first restricting part83and the combination of second guide wall75and second restricting part84, it is possible to prevent color wheel22and rod integrator23from coming into contact with each other. Therefore, when color wheel assembly21is attached to holder24, it is possible to prevent color wheel22from being damaged by contact.

Color wheel assembly21includes sensor85that detects a rotation phase of motor81. Sensor85is attached to upper surface82cof support part82on a side of motor81. Sensor85is, for example, a reflective optical sensor, and irradiates rotation shaft81aof motor81with infrared light from sensor85and detects light reflected by rotation shaft81a. A black marker seal81bis attached to the rotation shaft81aof motor81. Sensor85can detect the rotation phase of motor81by detecting the reflected light as an ON signal with respect to a part on rotation shaft81ato which marker seal81bis not attached, and detecting the reflected light as an OFF signal since it is not possible to detect the reflected light with respect to a part to which marker seal81bis attached. A detection signal detected by sensor85is transmitted to controller7.

Support part82includes light shielding wall86between rod integrator23and sensor85below upper surface82c. Due to light shielding wall86, even if the incident light is scattered at an end part of rod integrator23on a side of color wheel22, an amount of the scattered light incident on sensor85can be reduced, and erroneous detection of sensor85can be reduced.

Light shielding wall86may be disposed not only on a side of rod integrator23of support part82but also on an opposite side thereof to further reduce incidence of scattered light on sensor85.

Color wheel assembly21has a dustproof lid function of reducing entry of dust from opening2aof housing2when attached to housing2of projection display apparatus1. In color wheel22, dust-proof sheet87is disposed inside first base71of holder24so as to surround second base72. Sheet87is, for example, a sponge. As a result, since color wheel assembly21is attached to housing2via sheet87, it is possible to reduce dust from entering housing2through a gap between color wheel assembly21and housing2.

When color wheel assembly21is attached to housing2of projection display apparatus1, guide piece88is inserted into guide part2b(seeFIG.7) formed in housing2of projection display apparatus1. Guide piece88is a metal piece extending from a side opposite to rod integrator23of wall part82bof support part82to a side opposite to color wheel22.

As illustrated inFIGS.8and9, when guide piece88is inserted into guide part2bof housing2, the movement of color wheel assembly21in the X-axis direction and the Z-axis direction is restricted, and end parts of color wheel22and rod integrator23can be prevented from coming into contact with housing2and being damaged. Guide part2bof housing2is formed by inner side surface2baof housing2and two wall parts2bb,2bcextending from housing2. An inner side surface of wall part2bbhas an inverted L shape, inner side surface2baof housing2and one surface of wall part2bbface each other, and the other surface of wall part2bband wall part2bcface each other. Guide piece88is guided to a space surrounded by inner side surface2ba, wall part2bb, and wall part2bc. The movement of guide piece88in the Z-direction is restricted by inner side surface2baof housing2and one surface of wall part2bb, and the movement of guide piece88in the X-direction is restricted by the other surface of wall part2bband wall part2bc.

As illustrated inFIG.6, grip part89is formed outside color wheel assembly21so as to be easily held by a user when color wheel assembly21is attached to housing2of projection display apparatus1. The user can easily attach color wheel assembly21to housing2by gripping grip part89, so that the assemblability can be improved. Inside third base73, wall part89aand two spaces89b,89care formed with wall part89ainterposed therebetween, and wall part89aand spaces89b,89cconstitute grip part89.

[1-3. Effects and the Like]

As described above, in the first exemplary embodiment, color wheel unit20includes color wheel assembly21having color wheel22, rod integrator23where light having passed through color wheel22is incident, and holder24to which color wheel assembly21and rod integrator23are attached. Holder24includes first base71attached to housing2of projection display apparatus1, second base72protruding from first base71, and third base73further protruding from second base72and to which rod integrator23is attached. Third base73includes first guide wall74and second guide wall75that guide when color wheel assembly21is attached to holder24. Color wheel assembly21includes motor81that is coupled to color wheel22and rotationally drives color wheel22, and support part82that rotatably supports color wheel22. Support part82includes first restricting part83whose movement is restricted and guided by first guide wall74, and second restricting part84whose movement is restricted and guided by second guide wall75when color wheel assembly21is attached to holder24.

With such a configuration, when color wheel assembly21is attached to holder24, by having the two guide walls, it is possible to prevent contact between color wheel22and rod integrator23and to reduce a risk of damaging each of them. Further, since color wheel unit20integrates color wheel22and rod integrator23which are frequently replaced, maintainability can be improved.

Next, an arrangement of phosphor segments of the phosphor wheel will be further described with reference toFIG.10.FIG.10is a front view of the phosphor wheel.

In phosphor wheel5, for example, annular wavelength conversion element92is disposed on annular region91aof metal substrate91, and passing region93through which light passes is provided in a partial region of annular region91a. An opening is formed in passing region93of substrate91. As described above, phosphor wheel5includes wavelength conversion element92having a segment shape.

Wavelength conversion element92includes first phosphor segment94that wavelength-converts the incident blue excitation light into green fluorescent light and emits the green fluorescent light, and second phosphor segment95that wavelength-converts the incident blue excitation light into yellow fluorescent light and emits the yellow fluorescent light.

[1-5. Configuration of Color Wheel]

Next, an arrangement of filters of the color wheel22will be further described with reference toFIG.11.FIG.11is a front view of the color wheel22.

Color wheel22includes substrate100, first segment101, second segment102, third segment103, and fourth segment104. First segment101, second segment102, third segment103, and fourth segment104are each formed by subjecting a surface of a fan-shaped glass plate to a predetermined optical treatment, and are arranged in an annular shape in order from an outer periphery of substrate100to an outside. Disk-shaped substrate100is made of metal and is also called a counterbalance, and is made of, for example, aluminum. Fan-shaped first to fourth segments101to104are bonded to a back surface of substrate100with an adhesive.

First segment101transmits green fluorescent light and yellow fluorescent light from phosphor wheel5. First segment101is subjected to, for example, processing of cutting blue light so as not to transmit blue light, and for example, a blue-cut dichroic film is formed.

Second segment102transmits yellow fluorescent light as red light when the yellow fluorescent light is incident, and transmits blue excitation light as blue light when the blue excitation light is incident. In the second segment, for example, a magenta filter is attached to substrate100.

Third segment103transmits yellow fluorescent light as red light when the yellow fluorescent light is incident. In the third segment, for example, a red filter is attached to substrate100.

Fourth segment104is glass having total wavelength transmission and is provided with an antireflection film. Therefore, light incident on fourth segment104passes through the fourth segment as it is.

[1-6. Rotation Control by Controller]

Controller7controls rotational phase positions of phosphor wheel5and color wheel22in one of two rotation modes of a first rotation mode and a second rotation mode as a rotational phase position of color wheel22with respect to phosphor wheel5. The first rotation mode is a mode in which brightness of light emitted from color wheel22is prioritized. The second rotation mode is a mode in which priority is given to chromaticity and color luminance of light emitted from color wheel22.

The first rotation mode will be described with reference toFIG.12.FIG.12is an explanatory diagram for explaining the first rotation mode. In the first rotation mode, the blue excitation light emitted from passing region93of phosphor wheel5is incident on second segment102of color wheel22, and is emitted from color wheel22as blue light. Next, phosphor wheel5and color wheel22rotate in a synchronized state, and the segment illuminated with the blue excitation light changes. The green fluorescent light excited by the excitation light and emitted from first phosphor segment94of phosphor wheel5is partially incident on fourth segment104of color wheel22and emitted from color wheel22as green light, and then the remaining green fluorescent light is incident on first segment101of color wheel22and emitted from color wheel22as green light.

Next, phosphor wheel5and color wheel22rotate in a further synchronized state. The yellow fluorescent light excited by the excitation light and emitted from second phosphor segment95of phosphor wheel5is partially incident on first segment101of color wheel22and emitted from color wheel22as yellow light, and then the remaining yellow fluorescent light is incident on third segment103of color wheel22and emitted from color wheel22as red light.

Since such conversion of light is performed every half rotation of phosphor wheel5and color wheel22, when phosphor wheel5and color wheel22each rotate once, two sequences of time-division color light can be obtained.

In the first rotation mode, in first segment101of color wheel22, a ratio between an amount of green fluorescent light emitted from first phosphor segment94of phosphor wheel5and transmitted and an amount of yellow fluorescent light emitted from second phosphor segment95and transmitted is a predetermined first ratio. The first ratio is, for example, 55% for green fluorescent light and 45% for yellow fluorescent light, and in the first rotation mode, the rotation phase of color wheel22is controlled such that first segment101transmits both the green fluorescent light and the yellow fluorescent light. As described above, as a proportion of the color light emitted from color wheel22, since the proportion of the red light is smaller than that in the second rotation mode to be described later and the yellow light is emitted accordingly, it is possible to secure more yellow of a complementary color and to improve the brightness. Further, in the yellow light, since the blue light included in the yellow fluorescent light emitted from phosphor wheel5is cut in first segment101, purity of yellow can be improved. Here, the blue light included in the yellow fluorescent light means unconverted excitation light that is emitted by being reflected by the phosphor wheel without being wavelength-converted into yellow fluorescent light because blue excitation light is not absorbed by the phosphor.

Next, the second rotation mode will be described with reference toFIG.13.FIG.13is an explanatory diagram for explaining the second rotation mode. In the second rotation mode, the rotation phase of color wheel22with respect to phosphor wheel5in the first rotation mode is changed as illustrated inFIG.13.

In the second rotation mode, the blue excitation light emitted from passing region93of phosphor wheel5is incident on fourth segment104of color wheel22, and is emitted from color wheel22as blue light. Next, when phosphor wheel5and color wheel22rotate in a synchronized state, green fluorescent light excited by the excitation light and emitted from first phosphor segment94of phosphor wheel5is incident on first segment101of color wheel22, and is emitted from color wheel22as green light.

Next, when phosphor wheel5and color wheel22are rotated in a further synchronized state, a part of the yellow fluorescent light excited by the excitation light and emitted from second phosphor segment95of phosphor wheel5is incident on third segment103of color wheel22and emitted from color wheel22as red light, and the remaining yellow fluorescent light is incident on second segment102of color wheel22and emitted from color wheel22as red light.

In the second rotation mode, similarly to the first rotation mode, such light conversion is performed every half rotation of each of phosphor wheel5and color wheel22. Therefore, when each of phosphor wheel5and color wheel22makes one rotation, two sequences of time-division color light can be obtained. Thus, color breaking can be reduced.

In the second rotation mode, in first segment101of color wheel22, the ratio between an amount of green fluorescent light emitted from first phosphor segment94of phosphor wheel5and transmitted and an amount of yellow fluorescent light emitted from second phosphor segment95and transmitted is a predetermined second ratio different from the first ratio, and the second ratio is, for example, 100% for green fluorescent light and 0% for yellow fluorescent light. That is, in the second rotation mode in the present exemplary embodiment, the rotation phases of the phosphor wheel and color wheel22are controlled such that first segment101of color wheel22transmits only the green fluorescent light. As described above, as a proportion of the color light emitted from color wheel22, the yellow light is not emitted as compared with the first rotation mode, and the proportion of the red light is increased accordingly. Therefore, a large amount of red light can be secured, and the color luminance of light can be improved. As a result, it is possible to project a vibrant red image with good red color development. Further, in green light, since blue light which is unconverted excitation light included in the green fluorescent light emitted from phosphor wheel5is cut by first segment101, purity of green can be improved. Note that in the above description, the second ratio is 100% for the green fluorescent light and 0% for the yellow fluorescent light. However, the second ratio is not limited to this, and may be set to an optimum ratio that increases the proportion of the red light, and may be set to a ratio slightly larger than 0% for the yellow fluorescent light, for example, 1%.

FIG.14is a graph illustrating a spectral change in green light. Graph Gr1 is a graph illustrating a spectral change of conventional green light emitted from color wheel22. Graph Gr2 is a graph illustrating a spectral change of green light in the first rotation mode of the present exemplary embodiment. Graph Gr3 is a graph illustrating a spectral change of green light in the second rotation mode of the present exemplary embodiment.

As illustrated inFIG.14, in the green light generated in the first rotation mode and the second rotation mode, a spectral component of the blue light is reduced as compared with the related art, and purity of green can be improved.

FIG.15is a graph illustrating a spectral change in red light. Graph Gr4 is a graph illustrating a spectral change of conventional red light emitted from color wheel22. Graph Gr5 is a graph illustrating a spectral change of red light in the first rotation mode of the present exemplary embodiment. Graph Gr6 is a graph illustrating a spectral change of red light in the second rotation mode of the present exemplary embodiment.

As illustrated inFIG.15, in the red light generated in the first rotation mode and the second rotation mode, a spectral component of the blue light is reduced as compared with the related art, and purity of red can be improved.

FIG.16is a graph illustrating color gamuts of blue, red, and green in a CIExy chromaticity diagram. Graph Gr7 is a graph illustrating a color gamut of conventional light emitted from color wheel22. Graph Gr8 is a graph illustrating a color gamut of light in the first rotation mode of the present exemplary embodiment. Graph Gr9 is a graph illustrating a color gamut of light in the second rotation mode of the present exemplary embodiment.

As illustrated inFIG.16, the color gamuts of the light generated in the first rotation mode and the second rotation mode are wider than the color gamut of the conventional light. The x value of red is improved from 0.636 in the conventional graph Gr7 to 0.650 in the graph Gr8 in the first rotation mode and to 0.651 in the graph Gr9 in the second rotation mode. Further, they value of green is improved from 0.585 in the conventional graph Gr7 to 0.591 in the graph Gr8 in the first rotation mode and to 0.597 in the graph Gr9 in the second rotation mode.

[1-7. Effects and Others]

As described above, in the first exemplary embodiment, light source device3includes phosphor wheel5, color wheel22, and controller7. Phosphor wheel5includes first phosphor segment94that is excited by blue laser light as excitation light and emits green fluorescent light, second phosphor segment95that is excited by blue laser light and emits yellow fluorescent light, and passing region93through which blue laser light passes. Color wheel22includes first segment101capable of transmitting green fluorescent light and yellow fluorescent light from phosphor wheel5. Controller7controls rotational phase positions of phosphor wheel5and color wheel22in one of two rotation modes of a first rotation mode and a second rotation mode as a rotational phase position of color wheel22with respect to phosphor wheel5. First segment101transmits the green fluorescent light and the yellow fluorescent light at a predetermined first ratio in the first rotation mode, and transmits the green fluorescent light and the yellow fluorescent light at a predetermined second ratio different from the first ratio in the second rotation mode. First segment101is subjected to processing of cutting blue laser light.

By changing the ratio between the green fluorescent light and the yellow fluorescent light transmitted through first segment101according to the rotation modes of phosphor wheel5and color wheel22, priority of brightness and priority of vividness of color can be further improved according to the rotation mode. Further, since the processing of cutting the blue light is performed on first segment101through which the green fluorescent light and the yellow fluorescent light are transmitted, the chromaticity of the light transmitted through first segment101can be improved.

OTHER EXEMPLARY EMBODIMENTS

As described above, the above exemplary embodiments have been described as examples of the techniques disclosed in the present application. However, the techniques in the present disclosure are not limited to the above exemplary embodiments, and can also be applied to exemplary embodiments in which change, substitution, addition, omission, and the like are performed. Further, a new exemplary embodiment can be made by combining the components described in the above exemplary embodiment.

As described above, the exemplary embodiment has been described to exemplify the techniques in the present disclosure. The accompanying drawings and the detailed description have been presented for this purpose. Accordingly, in order to exemplify the techniques described above, components illustrated or described in the accompanying drawings and the detailed description may not only include components that are essential for solving the problems, but may also include components that are not essential for solving the problems. For this reason, it should not be immediately construed that those non-essential components are essential only based on the fact that those non-essential components are illustrated in the accompanying drawings or described in the detailed description.

Further, the above exemplary embodiment is provided to exemplify the techniques according to the present disclosure. Therefore, it is possible to make various changes, replacements, additions, omissions, and the like, within the scope of the claims and equivalents thereof.

OVERVIEW OF EXEMPLARY EMBODIMENT

(1) A color wheel unit of the present disclosure includes a color wheel assembly having a color wheel, a rod integrator where light having passed through the color wheel is incident, and a holder to which the color wheel assembly and the rod integrator are attached. The holder includes a first base attached to a housing of a projection display apparatus, a second base protruding from the first base, and a third base further protruding from the second base and to which the rod integrator is attached. The third base includes a first guide wall and a second guide wall that guide the color wheel assembly when the color wheel assembly is attached to the holder. The color wheel assembly includes a motor that is coupled to the color wheel and rotationally drives the color wheel, and a support part that rotatably supports the color wheel. The support part includes a first restricting part whose movement is restricted and guided by the first guide wall, and a second restricting part whose movement is restricted and guided by the second guide wall when the color wheel assembly is attached to the holder.

Thus, when the color wheel assembly is attached to the holder, the two guide walls are provided, so that the contact between the color wheel and the rod integrator can be prevented, and a risk of damaging each of the color wheel and the rod integrator can be reduced. Further, since the color wheel unit integrates the color wheel and the rod integrator which are frequently replaced, maintainability can be improved.

(2) In the color wheel unit of (1), the first restricting part is a flat plate, and the first guide wall is a plane parallel to the first restricting part.

(3) In the color wheel unit of (1) or (2), the second restricting part is a convex part, and the second guide wall is a concave part fitted to the second restricting part.

(4) In the color wheel unit according to any one of (1) to (3), the color wheel unit includes a guide piece to be inserted into a guide part formed in the housing of the projection display apparatus.

As a result, since a user only needs to insert the guide piece of the color wheel unit into the guide part of the housing, assemblability can be improved.

(5) In the color wheel unit according to any one of (1) to (4), the holder covers an attachment opening disposed on a side of a predetermined surface of the housing of the projection display apparatus.

(6) In the color wheel unit according to any one of (1) to (5), a handle part that grips the holder is formed on a side opposite to a side where the support part of the holder is attached.

Accordingly, since the user can easily grip the color wheel unit, assemblability can be improved.

(7) In the color wheel unit according to any one of (1) to (6), in the first base, a sheet is disposed at a position corresponding to a periphery of an opening on a side attached to the housing of the projection display apparatus.

As a result, when the color wheel unit is attached to the housing, the holder itself on which the sheet is disposed can function as a dustproof lid.

(8) In the color wheel unit according to any one of (1) to (7), the color wheel assembly includes a sensor that detects a rotation phase of the motor. The support part includes a light shielding wall between the rod integrator and the sensor.

As a result, scattered light can be reduced from entering the sensor by the light shielding wall, and erroneous detection of the sensor can be reduced.

(9) A projection display apparatus of the present disclosure includes any one of the color wheel units (1) to (8).

Further, when a light amount of excitation light increases, a light amount of the color of the excitation light increases more than a light amount of other colors, and there is also a problem that a color gamut of projection light is narrowed.

Therefore, an object of the present disclosure is to provide a light source device and a projection display apparatus capable of widening a color gamut.

(10) A light source device of the present disclosure includes: a phosphor wheel including a first phosphor segment that is excited by first color light that is excitation light and emits second color light that is fluorescent light, a second phosphor segment that is excited by the first color light and emits third color light that is fluorescent light, and a region that makes the first color light pass through; a color wheel including a first segment capable of transmitting the second color light and the third color light from the phosphor wheel; and a controller that controls rotational phase positions of the phosphor wheel and the color wheel in one of two rotation modes of a first rotation mode and a second rotation mode as a rotational phase position of the color wheel with respect to the phosphor wheel. The first segment transmits the second color light and the third color light at a predetermined first ratio in the first rotation mode, and transmits the second color light and the third color light at a predetermined second ratio different from the first ratio in the second rotation mode. The first segment is subjected to processing of cutting the first color light.

By changing the ratio between the green fluorescent light and the yellow fluorescent light transmitted through first segment101according to the rotation modes of phosphor wheel5and color wheel22, priority of brightness and priority of vividness of color can be further improved according to the rotation mode. Further, since the processing of cutting blue light is applied to first segment101through which the green fluorescent light and the yellow fluorescent light are transmitted, the chromaticity of the light transmitted through first segment101can be improved, and the color gamut can be widened.

(11) In the light source device of (10), the first color light that is the excitation light is blue laser light. The first phosphor segment is a green phosphor segment that emits green fluorescent light that is the second color light. The second phosphor segment is a yellow phosphor segment that emits yellow fluorescent light that is the third color light.

(12) A light source device of the present disclosure includes: a phosphor wheel including a first phosphor segment that is excited by blue laser light and emits green fluorescent light, a second phosphor segment that is excited by blue laser light and emits yellow fluorescent light, and a substrate on which the first phosphor segment and the second phosphor segment are disposed; a color wheel including a first segment capable of transmitting the green fluorescent light and the yellow fluorescent light from the phosphor wheel; and a controller that controls rotational phase positions of the phosphor wheel and the color wheel in one of two rotation modes of a first rotation mode and a second rotation mode as a rotational phase position of the color wheel with respect to the phosphor wheel. The controller controls the first segment to transmit both the green fluorescent light and the yellow fluorescent light in the first rotation mode, and to transmit the green fluorescent light in the second rotation mode. The first segment is subjected to processing of cutting the blue laser light.

(13) In the light source device according to any one of (10) to (12), the color wheel includes: a second segment in which a magenta filter is disposed, the second segment transmitting third color light as red light when the third light that is yellow fluorescent light is incident, and transmitting first color light as blue light when the first light that is blue laser light is incident; and a third segment in which a red filter is disposed, the third segment transmitting the third color light as red light when the third color light that is the yellow fluorescent light is incident. A first phosphor segment that is a green phosphor segment, and a second phosphor segment that is a yellow phosphor segment are disposed in the phosphor wheel, the phosphor wheel emitting two sequences of time-division light when circling around once. The first, second, and the third segments are disposed in the color wheel, the color wheel emitting two sequences of time-division light when circling around once.

(14) In the light source device according to (13), the controller controls the second segment to transmit the blue laser light in the first rotation mode, and to transmit the yellow fluorescent light in the second rotation mode in the second segment.

(15) In the light source device of (14), the controller transmits the yellow fluorescent light in the first rotation mode and the second rotation mode in the third segment.

(16) A projection display apparatus of the present disclosure includes any one of light source devices (10) to (15).

The present disclosure is applicable to a phosphor wheel that emits illumination light to wavelength-convert the light, a light source device that uses the light wavelength-converted by the phosphor wheel, and a projection display apparatus.