Light source device and projection-type image display apparatus

Abstract

To provide a light source device and a projection-type image display apparatus capable of widening a color gamut.SOLUTION: A light source device includes: a phosphor wheel having a first phosphor segment, a second phosphor segment, and a region through which excitation light of first color light passes; a color wheel having a first segment that is capable of transmitting fluorescent light of second color light and fluorescent light of third color light; and a control unit that controls rotational phase positions of the phosphor wheel and the color wheel in either of two rotation modes including a first rotation mode and a second rotation mode. The first segment transmits the fluorescent light of the second color light and the fluorescent light of the third color light at a first ratio in the first rotation mode, and transmits the fluorescent light at a predetermined second ratio different from the first ratio in the second rotation mode. The first segment is subjected to processing that cuts the first color light.SELECTED DRAWING: Figure 12

Description

[Technical Field]

[0001] The present invention relates to a color wheel unit, a light source device, and a projection-type image display device. [Background technology]

[0002] Conventionally, in order to align the color wheel and the rod integrator, a color wheel unit that integrates them has been proposed.

[0003] For example, Patent Document 1 proposes a color wheel assembly in which a color wheel and a light guide are integrated.

[0004] Furthermore, Patent Document 2 proposes a light source device in which a dichroic film that reflects blue light is disposed on a color wheel, thereby cutting out blue light. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Utility Model Registration No. 3099869 [Patent Document 2] Japanese Patent Application Publication No. 2017-167528 Summary of the Invention [Problem to be solved by the invention]

[0006] However, when the amount of excitation light increases, the amount of light of one color of the excitation light increases more than the amount of light of other colors, which may narrow the color gamut of the projection light.

[0007] An object of the present disclosure is to provide a light source device and a projection-type image display device that can widen the color gamut. [Means for solving the problem]

[0008] The light source device according to the present disclosure includes a phosphor wheel having a first phosphor segment that is excited by excitation light of a first color light and emits fluorescent light of a second color light, a second phosphor segment that is excited by excitation light of the first color light and emits fluorescent light of a third color light, and an area that passes the excitation light of the first color light; a color wheel having a first segment that is capable of transmitting the fluorescent light of the second color light and the fluorescent light of the third color light from the phosphor wheel; and a controller that controls the rotational phase position of the phosphor wheel and the color wheel in one of two rotation modes, a first rotation mode and a second rotation mode, as a rotational phase position of the color wheel relative to the phosphor wheel. In the first rotation mode, the first segment transmits the fluorescent light of the second color light and the fluorescent light of the third color light at a predetermined first ratio, and in the second rotation mode, the first segment transmits the fluorescent light of the second color light and the fluorescent light of the third color light at a predetermined second ratio different from the first ratio. The first segment is treated to cut the first color light. [Effects of the Invention]

[0009] The present disclosure can provide a light source device and a projection-type image display device that can widen the color gamut. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a diagram showing a configuration of a projection-type image display device according to a first embodiment; [Figure 2] Perspective view of the color wheel unit [Figure 3] Bottom view of the color wheel unit [Figure 4] Side view of the color wheel unit [Figure 5] Perspective view of the color wheel unit [Figure 6] Perspective view of the color wheel unit [Figure 7] Partial perspective view of the housing of the projection-type image display device [Figure 8] A perspective view illustrating the attachment of the color wheel unit to the housing. [Figure 9]An explanatory diagram showing the color wheel unit attached to the housing [Figure 10] Front view of phosphor wheel [Figure 11] Color wheel front view [Figure 12] FIG. 10 is an explanatory diagram illustrating a first rotation mode. [Figure 13] FIG. 10 is an explanatory diagram illustrating a second rotation mode. [Figure 14] Graph showing spectral changes in green light [Figure 15] Graph showing spectral changes in red light [Figure 16] Graph showing the blue, red, and green color gamuts on the CIExy chromaticity diagram DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. However, more detailed explanations than necessary may be omitted. For example, detailed explanations of well-known matters or redundant explanations of substantially identical configurations may be omitted. This is to avoid unnecessary redundancy in the following explanation and to facilitate understanding by those skilled in the art.

[0012] The accompanying drawings and the following description are provided to enable those skilled in the art to fully understand the present disclosure, and are not intended to limit the subject matter described in the claims.

[0013] (Embodiment 1)

[0014] [1-1. Configuration of projection-type image display device] (Embodiment 1) A projection-type image display device 1 according to the first embodiment will be described with reference to Fig. 1. Fig. 1 is a diagram showing the configuration of the projection-type image display device 1 according to the first embodiment.

[0015] As shown in FIG. 1, light source device 3 of the first embodiment is a light source device for a one-chip DMD (Digital Micromirror Device) type projection image display device that uses one DMD. Light source device 3 includes laser light source 11, phosphor wheel 5, color wheel unit 20, and control unit 7. Laser light in the blue wavelength range emitted from multiple laser light sources 11 is collimated by multiple collimator lenses (not shown) provided corresponding to each laser light source 11. The collimated blue light enters subsequent convex lens 13, where its beam width is reduced, and then enters subsequent diffuser plate 14 and is diffused, improving the uniformity of the light. The blue light with improved uniformity enters subsequent concave lens 15, where it is collimated.

[0016] The blue light collimated by concave lens 15 enters selective reflection element 16, which is arranged at an angle of approximately 45 degrees with respect to the optical axis, then travels straight ahead and enters convex lens 17. Selective reflection element 16 has spectral characteristics that allow light in the wavelength range of blue light emitted from laser light source 11 to pass through, and reflect light in the wavelength range of fluorescence that is wavelength-converted by phosphor wheel 5 using the blue light from laser light source 11 as excitation light. Selective reflection element 16 is, for example, a dichroic mirror.

[0017] The blue light incident on convex lens 17, in combination with subsequent convex lens 18, is incident on wavelength conversion element 92 or passage area 93, each of which is arranged in an annular area on substrate 91 of subsequent phosphor wheel 5 (see FIG. 10). Phosphor wheel 5 is arranged around its rotation axis so that the blue excitation light collected by convex lenses 17 and 18 is incident on the annular wavelength conversion element 92 or passage area 93. Phosphor wheel 5 is provided with a sensor (not shown) that detects the rotation phase of the motor that rotates phosphor wheel 5. A detection signal detected by this sensor is sent to control unit 7.

[0018] The blue light focused on wavelength conversion element 92 of phosphor wheel 5 by convex lenses 17 and 18 is wavelength-converted into fluorescence, and the light direction is changed by 180 degrees to enter convex lenses 18 and 17 again in this order, where it is converted into parallel light, as shown in Fig. 1. The fluorescence to be wavelength-converted here is, for example, green light and yellow light.

[0019] The fluorescence that has exited convex lens 17 and been converted into parallel light is incident again on selective reflection element 16. As described above, selective reflection element 16 has the property of reflecting light in the wavelength region of the fluorescence, so the direction of the light in the wavelength region of the fluorescence is changed by 90 degrees and made to enter convex lens 39.

[0020] Next, the blue light from laser light source 11 that has been condensed in passage area 93 of phosphor wheel 5 passes through phosphor wheel 5 and is collimated by subsequent convex lenses 31 and 32. Thereafter, a relay lens system provided subsequent to the relay lens system, which is composed of three reflecting mirrors 33, 35, and 37 and three convex lenses 34, 36, and 38, guides the collimated light so that it enters selective reflection element 16 from a direction at an angle of 90 degrees to the direction in which the light from laser light source 11 is incident. Note that although the relay optical system is configured here using three mirrors and three convex lenses, other configurations may be used as long as they have similar performance.

[0021] The blue light incident on the selective reflection element 16 from the convex lens 38 passes through the selective reflection element 16 and travels straight ahead.

[0022] With the above configuration, the fluorescent light and the blue light are incident on the convex lens 39 in a time-division manner.

[0023] The time-division fluorescence and blue light incident on the convex lens 39 from the selective reflection element 16 are focused by the convex lens 39 and then incident on the color wheel 22 of the downstream color wheel unit 20. The color wheel 22 is controlled by the control unit 7 to rotate synchronously with the phosphor wheel 5. Multiple filters are attached to the color wheel 22, each with a characteristic that transmits part or all of the wavelength range of the blue light and fluorescence, depending on the characteristics of the optical system. The control unit 7 can be realized using semiconductor elements or the like. The control unit 7 can be configured, for example, with a microcomputer, CPU, MPU, GPU, DSP, FPGA, or ASIC. The control unit 7 realizes predetermined functions by reading data and programs stored in a built-in memory unit (not shown) and performing various arithmetic operations. The memory unit can be realized, for example, with a hard disk drive (HDD), SSD, RAM, DRAM, ferroelectric memory, flash memory, magnetic disk, or a combination of these.

[0024] For example, during a time period when yellow fluorescence is emitted from phosphor wheel 5, color wheel 22 rotates in synchronization with the time period, having at least one of the following regions: a region that transmits the wavelength range of the fluorescence as is, a region that reflects the red portion of the fluorescence and transmits green light, and a region that reflects the green portion of the fluorescence and transmits red light. Furthermore, the region that transmits the wavelength range of the fluorescence as is corresponds to the blue light that has passed through the passage region of phosphor wheel 5, so that color light of different wavelength ranges is focused in time series near the incident end of rod integrator 23.

[0025] The light incident on the rod integrator 23 of the color wheel unit 20 is homogenized by the rod integrator 23, and the homogenized light is emitted from the exit end thereof.

[0026] In the first embodiment, the color wheel 22 is disposed in front of the rod integrator 23, but it may be disposed after the rod integrator 23.

[0027] 1, the projection-type image display device 1 of the first embodiment is, for example, a so-called one-chip type DMD projector that uses one DMD. The projection-type image display device 1 includes a light source device 3.

[0028] The light emitted from the rod integrator 23 is projected onto a DMD 51 (described later) by a relay lens system consisting of convex lenses 41, 42, and 43.

[0029] The light that passes through convex lenses 41 , 42 , and 43 and enters total reflection prism 44 enters minute gap 45 of total reflection prism 44 at an angle equal to or greater than the total reflection angle, and is reflected to change the direction of travel of the light and enter DMD 51 .

[0030] The DMD 51 changes the direction of the micromirrors in response to a signal from an image circuit (not shown) synchronized with the colored light emitted by the combination of the phosphor wheel 5 and the color wheel 22, and then emits the light in a different traveling direction.

[0031] The light whose direction of travel has been changed in response to the image signal in DMD 51 enters total reflection prism 44, and is incident on minute gap 45 of total reflection prism 44 at an angle less than the total reflection angle, thereby passing through as is, entering projection lens unit 55, and being projected onto a screen not shown.

[0032] [1-2. Color wheel unit configuration] The color wheel unit 20 according to the first embodiment will be described below with reference to Fig. 2 to Fig. 6. Fig. 2 is an external perspective view of the color wheel unit 20. Fig. 3 is a bottom view of the color wheel unit 20. Fig. 4 is a side view of the color wheel unit 20. Figs. 5 and 6 are external perspective views of the color wheel unit. In each figure, the plane on which the color wheel 22 receives light is defined as the XY plane, and the direction perpendicular to the XY plane is defined as the Z direction.

[0033] Color wheel unit 20 includes color wheel assembly 21 having color wheel 22, rod integrator 23 onto which light that has passed through color wheel 22 is incident, and holder 24 to which color wheel assembly 21 and rod integrator 23 are attached. Color wheel unit 20 is attached to housing 2 as a lid for opening 2a formed in housing 2 of projection-type image display device 1 so that color wheel assembly 21 and rod integrator 23 are housed within housing 2 through opening 2a, as shown in FIG. 7 or 8.

[0034] Holder 24 is made of metal, for example, by aluminum die-casting. Holder 24 includes a first base portion 71 attached to housing 2 of projection-type image display device 1, a second base portion 72 protruding from first base portion 71 to one side, i.e., toward the inside of housing 2 to which holder 24 is attached, and a third base portion 73 protruding further to one side from second base portion 72 and to which rod integrator 23 is attached.

[0035] The third base portion 73 has a trapezoidal shape with two stages at the top. The third base portion 73 has a flat mounting portion 73a on which one surface of the rod integrator 23 is placed, and a first wall portion 73b that stands up from the mounting portion 73a. The wall surface of the first wall portion 73b on the color wheel 22 side stands up from the second base portion 72. A side surface of the rod integrator 23 abuts against a part of the side surface of the first wall portion 73b opposite the color wheel 22. The rod integrator 23 is pressed against the mounting portion 73a and the first wall portion 73b, and is fixed to the third base portion 73 by fasteners 76.

[0036] The third base portion 73 has a first guide wall 74 and a second guide wall 75 that guide the color wheel assembly 21 when the color wheel assembly 21 is attached to the holder 24. The first guide wall 74 is formed on the first wall portion 73b on the side of the rotation axis Ar of the motor 81 of the color wheel 22. The first guide wall 74 is a surface in which a portion of the first wall portion 73b on the side of the rotation axis Ar, which is mostly an inclined surface, is formed into a vertical surface.

[0037] The second guide wall 75 is formed on a second wall portion 73c of the third base portion 73 extending toward the color wheel 22. The second guide wall has a semi-cylindrical shape and restricts movement in the X and Z directions.

[0038] The color wheel assembly 21 includes a motor 81 coupled to the color wheel 22 to rotate the color wheel 22, and a support unit 82 that rotatably supports the color wheel 22. The color wheel 22 is integrated with the motor 81, and the support unit 82 supports the rotation shaft 81a of the motor 81, thereby supporting the color wheel 22.

[0039] The support portion 82 has a bottom surface 82a attached to the second base portion 72, a wall portion 82b standing from the bottom surface 82a, and an upper surface 82c extending from the wall portion 82b parallel to the bottom surface 82a. The support portion 82 also has a first restriction portion 83 whose movement is restricted and guided by the first guide wall 74 when the color wheel assembly 21 is attached to the holder 24, and a second restriction portion 84 whose movement is restricted and guided by the second guide wall 75.

[0040] The first restricting portion 83 is, for example, an inverted L-shaped flat plate, and the first guide wall 74 is a parallel plane facing the first restricting portion 83. Therefore, by pressing the first restricting portion 83 against the first guide wall 74, it is possible to restrict the color wheel assembly 21 from moving in the negative direction of the X axis.

[0041] The second restricting portion 84 has a convex shape, for example, a semicircular shape. The second guide wall 75 has a concave shape that fits with the second restricting portion 84. Therefore, by fitting the second restricting portion 84 into the second guide wall 75, it is possible to restrict movement of the color wheel assembly 21 in the X-axis direction and the positive direction of the Z-axis.

[0042] In this way, the combination of first guide wall 74 and first restricting portion 83 and the combination of second guide wall 75 and second restricting portion 84 properly guides color wheel assembly 21 into holder 24, preventing contact between color wheel 22 and rod integrator 23. Therefore, when attaching color wheel assembly 21 to holder 24, damage to color wheel 22 due to contact can be prevented.

[0043] The color wheel assembly 21 includes a sensor 85 that detects the rotational phase of the motor 81. The sensor 85 is attached to the motor 81 side of the upper surface 82c of the support portion 82. The sensor 85 is, for example, a reflective optical sensor that irradiates the rotating shaft 81a of the motor 81 with infrared light and detects the light reflected by the rotating shaft 81a. A black marker sticker 81b is affixed to the rotating shaft 81a of the motor 81. The sensor 85 detects the reflected light from areas of the rotating shaft 81a where the marker sticker 81b is not affixed as an ON signal, and detects the reflected light from areas where the marker sticker 81b is affixed as an OFF signal, thereby detecting the rotational phase of the motor 81. The detection signal detected by the sensor 85 is sent to the control portion 7.

[0044] Supporting portion 82 has a light-shielding wall 86 below upper surface 82c between rod integrator 23 and sensor 85. Even if incident light is scattered at the end of rod integrator 23 on the color wheel 22 side, light-shielding wall 86 can reduce the amount of scattered light that enters sensor 85, thereby reducing false detection by sensor 85.

[0045] The light-shielding wall 86 may be disposed not only on the rod integrator 23 side of the support portion 82 but also on the opposite side, thereby further reducing the scattered light from entering the sensor 85.

[0046] When the color wheel assembly 21 is attached to the housing 2 of the projection-type image display device 1, it functions as a dustproof lid that reduces the intrusion of dust through the opening 2a of the housing 2. The color wheel 22 has a dustproof sheet 87 placed inside the first base portion 71 of the holder 24, surrounding the periphery of the second base portion 72. The sheet 87 is made of, for example, a sponge. As a result, the color wheel assembly 21 is attached to the housing 2 via the sheet 87, which reduces the intrusion of dust into the housing 2 through the gap between the color wheel assembly 21 and the housing 2.

[0047] When the color wheel assembly 21 is attached to the housing 2 of the projection-type image display device 1, it has a guide piece 88 that is inserted into a guide portion 2b (see FIG. 7) formed on the housing 2 of the projection-type image display device 1. The guide piece 88 is a metal piece that extends from the opposite side of the rod integrator 23 of the wall portion 82b of the support portion 82 to the side opposite the color wheel 22.

[0048] As shown in FIGS. 8 and 9 , inserting the guide piece 88 into the guide portion 2b of the housing 2 restricts movement of the color wheel assembly 21 in the X-axis and Z-axis directions, preventing the ends of the color wheel 22 and the rod integrator 23 from contacting the housing 2 and causing damage. The guide portion 2b of the housing 2 is formed by an inner surface 2ba of the housing 2 and two wall portions 2bb and 2bc extending from the housing 2. The inner surface of the wall portion 2bb has an inverted L-shape, with the inner surface 2ba of the housing 2 facing one surface of the wall portion 2bb, and the other surface of the wall portion 2bb facing the wall portion 2bc. The guide piece 88 is guided in the space surrounded by the inner surface 2ba, the wall portion 2bb, and the wall portion 2bc. The inner surface 2ba of the housing 2 and one surface of the wall portion 2bb restrict movement of the guide piece 88 in the Z direction, and the other surface of the wall portion 2bb and the wall portion 2bc restrict movement of the guide piece 88 in the X direction.

[0049] 6, a grip portion 89 is formed on the outside of the color wheel assembly 21 to make it easier for the user to hold when attaching the color wheel assembly 21 to the housing 2 of the projection-type image display device 1. The user can easily attach the color wheel assembly 21 to the housing 2 by grasping this grip portion 89, thereby improving the ease of assembly. A wall portion 89a and two spaces 89b and 89c are formed inside the third base portion 73, with the wall portion 89a and the spaces 89b and 89c sandwiched between them; the grip portion 89 is made up of the wall portion 89a and the spaces 89b and 89c.

[0050] [1-3. Effects, etc.] As described above, in the first embodiment, the color wheel unit 20 includes the color wheel assembly 21 having the color wheel 22, the rod integrator 23 onto which light that has passed through the color wheel 22 is incident, and the holder 24 to which the color wheel assembly 21 and the rod integrator 23 are attached. The holder 24 includes a first base portion 71 that is attached to the housing 2 of the projection-type image display device 1, a second base portion 72 that protrudes from the first base portion 71, and a third base portion 73 that protrudes further from the second base portion 72 and to which the rod integrator 23 is attached. The third base portion 73 has a first guide wall 74 and a second guide wall 75 that guide the color wheel assembly 21 when it is attached to the holder 24. The color wheel assembly 21 includes a motor 81 that is coupled to the color wheel 22 and that rotates the color wheel 22, and a support portion 82 that rotatably supports the color wheel 22. The support portion 82 has a first regulating portion 83 whose movement is restricted and guided by the first guide wall 74 when the color wheel assembly 21 is attached to the holder 24, and a second regulating portion 84 whose movement is restricted and guided by the second guide wall 75.

[0051] With this configuration, when attaching color wheel assembly 21 to holder 24, the two guide walls prevent contact between color wheel 22 and rod integrator 23, reducing the risk of damaging either. Furthermore, because color wheel unit 20 integrates color wheel 22 and rod integrator 23, which are frequently replaced, maintainability can be improved.

[0052] [1-4. Phosphor wheel configuration] The arrangement of the phosphor segments of the phosphor wheel will now be further described with reference to Figure 10. Figure 10 is a front view of the phosphor wheel.

[0053] The phosphor wheel 5 has an annular wavelength conversion element 92 disposed on an annular region 91a of a substrate 91 made of, for example, metal, and further has a light passage region 93 formed in a portion of the annular region 91a, through which light passes. An opening is formed in the passage region 93 of the substrate 91. In this way, the phosphor wheel 5 has a segment-shaped wavelength conversion element 92.

[0054] The wavelength conversion element 92 has a first phosphor segment 94 that converts the wavelength of incident blue excitation light into green fluorescent light and emits it, and a second phosphor segment 95 that converts the wavelength of incident blue excitation light into yellow fluorescent light and emits it.

[0055] [1-5. Color Wheel Composition] Next, the arrangement of filters on the color wheel 22 will be further described with reference to Figure 11. Figure 11 is a front view of the color wheel 22.

[0056] The color wheel 22 includes a substrate 100, a first segment 101, a second segment 102, a third segment 103, and a fourth segment 104. The first segment 101, the second segment 102, the third segment 103, and the fourth segment 104 are each formed by subjecting the surface of a fan-shaped glass plate to a predetermined optical treatment, and are arranged in order in a circular ring shape on the substrate 100. The disk-shaped substrate 100 is made of metal, also called a counterbalance, and is made of, for example, aluminum. Each of the fan-shaped segments 101 to 104 is attached to the back surface of the substrate 100 with an adhesive.

[0057] The first segment 101 transmits the green fluorescent light and the yellow fluorescent light from the phosphor wheel 5. The first segment 101 is treated to cut blue light, for example, so that blue light does not pass through, and for example, a blue-cut dichroic film is formed on the first segment 101.

[0058] The second segment 102 transmits yellow fluorescent light as red light when it is incident thereon, and transmits blue excitation light as blue light when it is incident thereon. The second segment 102 has, for example, a magenta filter attached to the substrate 100.

[0059] When yellow fluorescent light is incident on the third segment 103, the third segment transmits the light as red light. In the third segment, for example, a red filter is attached to the substrate 100.

[0060] The fourth segment 104 is made of glass that transmits all wavelengths and is coated with an anti-reflection film, so that light incident on the fourth segment 104 passes through the fourth segment as is.

[0061] [1-6. Rotation control by the control unit] The control unit 7 controls the rotational phase positions of the phosphor wheel 5 and the color wheel 22 in one of two rotation modes, a first rotation mode and a second rotation mode, as the rotational phase position of the color wheel 22 relative to the phosphor wheel 5. The first rotation mode is a mode that prioritizes the brightness of the light emitted from the color wheel 22. The second rotation mode is a mode that prioritizes the chromaticity and color brightness of the light emitted from the color wheel 22.

[0062] The first rotation mode will be described with reference to FIG. 12. FIG. 12 is an explanatory diagram illustrating the first rotation mode. In the first rotation mode, blue excitation light emitted from the passage area 93 of the phosphor wheel 5 enters the second segment 102 of the color wheel 22 and exits from the color wheel 22 as blue light. Next, the phosphor wheel 5 and the color wheel 22 rotate synchronously, and the segment illuminated by the blue excitation light changes. Green fluorescent light is excited by the excitation light and exits from the first phosphor segment 94 of the phosphor wheel 5. A portion of the green fluorescent light first enters the fourth segment 104 of the color wheel 22 and exits from the color wheel 22 as green light, and then the remaining green fluorescent light enters the first segment 101 of the color wheel 22 and exits from the color wheel 22 as green light.

[0063] Next, the phosphor wheel 5 and color wheel 22 rotate again in synchronization. The yellow fluorescent light excited by the excitation light and emitted from the second phosphor segment 95 of the phosphor wheel 5 first partially enters the first segment 101 of the color wheel 22 and is emitted from the color wheel 22 as yellow light, and then the remaining yellow fluorescent light enters the third segment 103 of the color wheel 22 and is emitted from the color wheel 22 as red light.

[0064] This type of light conversion is performed every half rotation of the phosphor wheel 5 and the color wheel 22, so that two sequences of time-division colored light can be obtained when the phosphor wheel 5 and the color wheel 22 each make one rotation.

[0065] In the first rotation mode, the ratio between the amount of green fluorescent light emitted from the first phosphor segment 94 of the phosphor wheel 5 that passes through the first segment 101 of the color wheel 22 and the amount of yellow fluorescent light emitted from the second phosphor segment 95 that passes through the first segment 101 is a predetermined first ratio. This first ratio is, for example, 55% green fluorescent light and 45% yellow fluorescent light. In the first rotation mode, the rotation phase of the color wheel 22 is controlled so that the first segment 101 transmits both green and yellow fluorescent light. As a result, the proportion of red light emitted from the color wheel 22 is smaller than in the second rotation mode (described later), and more yellow light is emitted. This ensures that more yellow, the complementary color, is emitted, and improves brightness. Furthermore, the blue light contained in the yellow fluorescent light emitted from the phosphor wheel 5 is filtered out in the first segment 101, improving the purity of the yellow light. Here, the blue light contained in the yellow fluorescent light refers to the unconverted excitation light that is not absorbed by the yellow phosphor and therefore not wavelength converted to fluorescent light, but is reflected by the phosphor wheel and emitted.

[0066] Next, the second rotation mode will be described with reference to Fig. 13. Fig. 13 is an explanatory diagram illustrating the second rotation mode. In the second rotation mode, the rotation phase of the color wheel 22 relative to the phosphor wheel 5 in the first rotation mode is changed as shown in Fig. 13.

[0067] In the second rotation mode, blue excitation light emitted from the passage area 93 of the phosphor wheel 5 enters the fourth segment 104 of the color wheel 22 and is emitted from the color wheel 22 as blue light. Next, when the phosphor wheel 5 and the color wheel 22 rotate synchronously, green fluorescent light excited by the excitation light and emitted from the first phosphor segment 94 of the phosphor wheel 5 enters the first segment 101 of the color wheel 22 and is emitted from the color wheel 22 as green light.

[0068] Next, when the phosphor wheel 5 and color wheel 22 rotate further in synchronization, the yellow fluorescent light is excited by the excitation light and emitted from the second phosphor segment 95 of the phosphor wheel 5. A portion of the yellow fluorescent light first enters the third segment 103 of the color wheel 22 and is emitted from the color wheel 22 as red light, and then the remaining yellow fluorescent light enters the second segment 102 of the color wheel 22 and is emitted from the color wheel 22 as red light.

[0069] In the second rotation mode, as in the first rotation mode, such light conversion is performed every half rotation of the phosphor wheel 5 and the color wheel 22, so that two sequences of time-division colored light can be obtained when the phosphor wheel 5 and the color wheel 22 each make one rotation, thereby reducing color breaking.

[0070] In the second rotation mode, the ratio between the amount of green fluorescent light emitted from the first phosphor segment 94 of the phosphor wheel 5 and the amount of yellow fluorescent light emitted from the second phosphor segment 95 transmitted through the first segment 101 of the color wheel 22 is a predetermined second ratio different from the first ratio described above. This second ratio is, for example, 100% green fluorescent light and 0% yellow fluorescent light. That is, in the second rotation mode of this embodiment, the rotation phases of the phosphor wheel and the color wheel 22 are controlled so that the first segment 101 of the color wheel 22 transmits only green fluorescent light. As described above, the proportion of colored light emitted from the color wheel 22 is increased compared to the first rotation mode, with no yellow light emitted. This ensures a larger amount of red light and improves the color brightness of the light. This results in better red color reproduction and allows for the projection of vivid red images. Furthermore, the purity of the green light can be improved because the first segment 101 cuts out blue light, which is unconverted excitation light contained in the green fluorescent light emitted from the phosphor wheel 5. In the above description, the second ratio is set to 100% green fluorescent light and 0% yellow fluorescent light, but this is not limiting and may be set to an optimum ratio that increases the proportion of red light, or may be set so that the proportion of yellow fluorescent light is slightly greater than 0%, for example, 1%.

[0071] 14 is a graph showing the spectral change in green light. Graph Gr1 is a graph showing the spectral change in conventional green light emitted from color wheel 22. Graph Gr2 is a graph showing the spectral change in green light in the first rotation mode of this embodiment. Graph Gr3 is a graph showing the spectral change in green light in the second rotation mode of this embodiment.

[0072] As shown in FIG. 14, in the green light generated by the first rotation mode and the second rotation mode, the blue light spectral components are reduced compared to the conventional case, and the purity of the green color is improved.

[0073] 15 is a graph showing the spectral change in red light. Graph Gr4 is a graph showing the spectral change in conventional red light emitted from color wheel 22. Graph Gr5 is a graph showing the spectral change in red light in the first rotation mode of this embodiment. Graph Gr6 is a graph showing the spectral change in red light in the second rotation mode of this embodiment.

[0074] As shown in FIG. 15, in the red light generated by the first rotation mode and the second rotation mode, the blue light spectral components are reduced compared to the conventional case, and the purity of the red color is improved.

[0075] 16 is a graph showing the color gamuts of blue, red, and green in the CIExy chromaticity diagram. Graph Gr7 is a graph showing the color gamut of conventional light emitted from color wheel 22. Graph Gr8 is a graph showing the color gamut of light in the first rotation mode of this embodiment. Graph Gr9 is a graph showing the color gamut of light in the second rotation mode of this embodiment.

[0076] As shown in Figure 16, the color gamuts of the light generated by the first rotation mode and the second rotation mode are wider than the color gamut of conventional light. The x value of red was 0.636 in the conventional graph Gr7, but improved to 0.650 in the first rotation mode graph Gr8 and to 0.651 in the second rotation mode graph Gr9. Furthermore, the y value of green was 0.585 in the conventional graph Gr7, but improved to 0.591 in the first rotation mode graph Gr8 and to 0.597 in the second rotation mode graph Gr9.

[0077] [1-7. Effects, etc.] As described above, in the first embodiment, the light source device 3 includes the phosphor wheel 5, the color wheel 22, and the control unit 7. The phosphor wheel 5 has a first phosphor segment 94 that is excited by blue excitation light and emits green fluorescent light, a second phosphor segment 95 that is excited by blue excitation light and emits yellow fluorescent light, and a passage region 93 that passes the blue excitation light. The color wheel 22 has a first segment 101 that can transmit the green fluorescent light and the yellow fluorescent light from the phosphor wheel 5. The control unit 7 controls the rotational phase positions of the phosphor wheel 5 and the color wheel 22 in either of two rotation modes, a first rotation mode or a second rotation mode, as the rotational phase position of the color wheel 22 relative to the phosphor wheel 5. The first segment 101 transmits green fluorescent light and yellow fluorescent light at a predetermined first ratio in the first rotation mode, and transmits green fluorescent light and yellow fluorescent light at a predetermined second ratio different from the first ratio in the second rotation mode. The first segment 101 is treated to cut blue light.

[0078] By changing the ratio of green fluorescent light and yellow fluorescent light that pass through first segment 101 according to the rotation mode of phosphor wheel 5 and color wheel 22, it is possible to further improve the prioritization of brightness and vividness of color according to the rotation mode. In addition, because first segment 101, through which green fluorescent light and yellow fluorescent light pass, is treated to cut blue light, it is possible to improve the chromaticity of the light that passes through first segment 101.

[0079] (Other embodiments) As described above, the above-described embodiments have been described as examples of the technology disclosed in the present application. However, the technology in the present disclosure is not limited to these, and can be applied to embodiments in which modifications, substitutions, additions, omissions, etc. are made. Furthermore, it is also possible to combine the components described in the above-described embodiments to create new embodiments.

[0080] As described above, the embodiments have been described as examples of the technology of the present disclosure. For this purpose, the accompanying drawings and detailed description have been provided. Therefore, the components described in the accompanying drawings and detailed description may include not only components essential for solving the problem, but also components that are not essential for solving the problem in order to exemplify the technology. Therefore, the fact that these non-essential components are described in the accompanying drawings or detailed description should not be interpreted as immediately indicating that these non-essential components are essential.

[0081] Furthermore, since the above-described embodiments are intended to illustrate the technology of the present disclosure, various modifications, substitutions, additions, omissions, etc. may be made within the scope of the claims or their equivalents.

[0082] (Outline of the embodiment) (1) When assembling a color wheel and a rod integrator serving as a light guide, the two may come into contact and be damaged. The present disclosure aims to provide a color wheel unit, a light source device, and a projection-type image display device that improve the ease of assembling the color wheel and the rod integrator. The color wheel unit of the present disclosure includes a color wheel assembly having a color wheel, a rod integrator into which light passing 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 portion attached to the housing of the projection-type image display device, a second base portion protruding from the first base portion, and a third base portion protruding further from the second base portion and to which the rod integrator is attached. The third base portion has first and second guide walls that guide the color wheel assembly when it is attached to the holder. The color wheel assembly includes a motor coupled to the color wheel to rotate the color wheel and a support portion that rotatably supports the color wheel. The support portion has a first restricting portion whose movement is restricted and guided by the first guide wall when the color wheel assembly is attached to the holder, and a second restricting portion whose movement is restricted and guided by the second guide wall.

[0083] As a result, when attaching the color wheel assembly to the holder, the two guide walls prevent contact between the color wheel and the rod integrator, reducing the risk of damaging either. Furthermore, because the color wheel unit integrates the color wheel and rod integrator, which are frequently replaced, it is possible to improve maintainability. The present disclosure can provide a color wheel unit, a light source device, and a projection-type image display device that improve the ease of assembly of the color wheel and rod integrator.

[0084] (2) In the color wheel unit of (1), the first restricting portion is a flat plate, and the first guiding portion is a plane parallel to the first restricting portion.

[0085] (3) In the color wheel unit of (1) or (2), the second restricting portion is a protruding portion, and the second guiding portion is a recessed portion that fits into the second restricting portion.

[0086] (4) In the color wheel unit of any one of (1) to (3), the color wheel unit has a guide piece that is inserted into a guide portion formed on the housing of the projection-type image display device.

[0087] This allows the user to simply insert the guide pieces of the color wheel unit into the guide parts of the housing, thereby improving assembly efficiency.

[0088] (5) In the color wheel unit of any one of (1) to (4), the holder covers an attachment opening that is located on a predetermined surface of the housing of the projection-type image display unit.

[0089] (6) In the color wheel unit of any one of (1) to (5), a handle for holding the holder is formed on the side opposite to the side where the support part of the holder is attached.

[0090] This allows the user to easily grip the color wheel unit, improving ease of assembly.

[0091] (7) In any one of the color wheel units (1) to (6), a sheet is arranged on the first base portion on the side that is attached to the housing of the projection-type image display device, at a position corresponding to the periphery of the opening.

[0092] This allows the holder on which the sheet is placed to function as a dustproof cover when the color wheel unit is attached to the housing.

[0093] (8) In the color wheel unit of any one of (1) to (7), the color wheel assembly includes a sensor that detects the rotation phase of the motor. The support portion includes a light-shielding wall between the rod integrator and the sensor.

[0094] This makes it possible to reduce scattered light incident on the sensor by the light-shielding wall, thereby reducing false detection by the sensor.

[0095] (9) The projection-type image display device of the present disclosure includes any one of the color wheel units (1) to (8).

[0096] Furthermore, when the amount of excitation light increases, the amount of light of one color of the excitation light increases more than the amount of light of other colors, which causes a problem of narrowing the color gamut of the projection light.

[0097] Therefore, another object of the present disclosure is to provide a light source device and a projection-type image display device that can widen the color gamut.

[0098] (10) A light source device according to the present disclosure includes a phosphor wheel having a first phosphor segment that is excited by excitation light of a first color light and emits fluorescent light of a second color light, a second phosphor segment that is excited by excitation light of the first color light and emits fluorescent light of a third color light, and an area that allows the excitation light of the first color light to pass; a color wheel having a first segment that is capable of transmitting the fluorescent light of the second color light and the fluorescent light of the third color light from the phosphor wheel; and a control unit that controls the rotational phase position of the phosphor wheel and the color wheel in one of two rotation modes, a first rotation mode and a second rotation mode, as a rotational phase position of the color wheel relative to the phosphor wheel. In the first rotation mode, the first segment transmits the fluorescent light of the second color light and the fluorescent light of the third color light at a predetermined first ratio, and in the second rotation mode, the fluorescent light of the second color light and the fluorescent light of the third color light at a predetermined second ratio different from the first ratio. The first segment is treated to cut the first color light.

[0099] By changing the ratio of green fluorescent light and yellow fluorescent light that pass through first segment 101 according to the rotation mode of phosphor wheel 5 and color wheel 22, it is possible to further improve the prioritization of brightness and vividness of color according to the rotation mode. Furthermore, because first segment 101, through which green fluorescent light and yellow fluorescent light pass, is treated to cut blue light, it is possible to improve the chromaticity of the light that passes through first segment 101 and widen the color gamut.

[0100] (11) In the light source device of (10), the excitation light of the first color 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, and the second phosphor segment is a yellow phosphor segment that emits yellow fluorescent light that is the third color light.

[0101] (12) A light source device according to the present disclosure includes a phosphor wheel having 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 green and yellow phosphor segments are arranged; a color wheel having a first segment that is capable of transmitting the green and yellow fluorescent light from the phosphor wheel; and a controller that controls the rotational phase position of the phosphor wheel and the color wheel relative to the phosphor wheel in one of two rotation modes, a first rotation mode and a second rotation mode. The controller controls the first segment so that it transmits both the green and yellow fluorescent light in the first rotation mode and transmits only the green fluorescent light in the second rotation mode. The first segment is treated to block blue light.

[0102] (13) In the light source device of any one of (10) to (12), the color wheel has a second segment with a magenta filter arranged thereon, which transmits incident yellow fluorescent light as red light and incident blue excitation light as blue light, and a third segment with a red filter arranged thereon, which transmits incident yellow fluorescent light as red light. A green phosphor segment and a yellow phosphor segment are arranged on the phosphor wheel so that two sequences of time-division light are emitted when the phosphor wheel makes one revolution. The first, second, and third segments are arranged on the color wheel so that two sequences of time-division light are emitted when the color wheel makes one revolution.

[0103] (14) In the light source device of (13), the control unit controls the second segment to transmit blue excitation light in the first rotation mode and to transmit yellow fluorescent light in the second rotation mode.

[0104] (15) In the light source device of (14), the control unit transmits yellow excitation light through the third segment in the first rotation mode and the second rotation mode.

[0105] (16) A projection-type image display device according to the present disclosure includes any one of the light source devices (10) to (15). [Industrial Applicability]

[0106] The present disclosure is applicable to a phosphor wheel that irradiates illumination light and converts the wavelength of the light, a light source device that uses light whose wavelength has been converted by the phosphor wheel, and a projection-type image display device. [Explanation of symbols]

[0107] 1 Projection-type image display device 2. Case 2a opening 2b Guide part 3 Light source device 5 Phosphor Wheel 6 PCB 7 Control Unit 11 Laser light source 14 Diffuser 15 Concave Lens 16 Selective Reflection Element 17, 19 Convex lenses 20 Color Wheel Unit 21 Color Wheel Assembly 22 Color Wheel 23 Rod Integrator 24 holder 31, 32, 34, 36, 38 Convex lenses 33, 35, 37 Reflective mirror 41, 42, 43 Convex lenses 44 Total Reflection Prism 45 Micro Gap 51 DMD 55 Projection lens unit 71 First base part 72 Second base part 73 Third Base 73a Placement section 73b 1st wall 73c 2nd wall 74 First Guide Wall 75 Second Guide Wall 76 Fasteners 81 Motor 81a Rotation axis 81b Marker sticker 82 Support part 82a bottom 82b Wall section 82c top surface 83 First Regulatory Department 84 Second Regulatory Department 85 sensors 86 Blackout Wall 87 seats 88 Guide piece 89 Gripping part 91 Circuit Board 91a Circular Region 92 Wavelength conversion element 93 Passage area 94 First Phosphor Segment 95 Second Phosphor Segment 101 First Segment 102 Second Segment 103 Third Segment 104 4th Segment

Claims

1. a phosphor wheel having first phosphor segments that are excited by excitation light of a first color light and emit fluorescent light of a second color light, second phosphor segments that are excited by excitation light of the first color light and emit fluorescent light of a third color light, and an area that passes the excitation light of the first color light; a color wheel having a first segment that can transmit the second color light and the third color light from the phosphor wheel; a control unit that controls a rotational phase position of the color wheel relative to the phosphor wheel in one of two rotation modes, a first rotation mode and a second rotation mode, The first segment is In the first rotation mode, the second color fluorescent light and the third color fluorescent light are transmitted at a predetermined first ratio, In the second rotation mode, the second color fluorescent light and the third color fluorescent light are transmitted at a predetermined second ratio different from the first ratio, The first segment is subjected to a treatment for cutting the first color light. Light source device.

2. the first color excitation light is blue laser light, the first phosphor segment is a green phosphor segment that emits green fluorescent light, which is the second color light; the second phosphor segment is a yellow phosphor segment that emits yellow fluorescent light, which is the third color light; The light source device according to claim 1 .

3. a phosphor wheel including: first phosphor segments that are excited by blue laser light and emit green fluorescent light; second phosphor segments that are excited by blue laser light and emit yellow fluorescent light; and a substrate on which the first phosphor segments and the second phosphor segments are arranged; a color wheel having a first segment capable of transmitting the green fluorescent light and the yellow fluorescent light from the phosphor wheel; a control unit that controls a rotational phase position of the color wheel relative to the phosphor wheel in one of two rotation modes, a first rotation mode and a second rotation mode, The control unit, in the first segment, in the first rotation mode, transmitting both the green fluorescent light and the yellow fluorescent light; In the second rotation mode, control is performed to transmit the green fluorescent light, The first segment is treated to cut blue light. Light source device.

4. The color wheel is a second segment in which a magenta filter is disposed, which transmits incident yellow fluorescent light as red light and incident blue excitation light as blue light; a third segment in which a red filter is disposed, which transmits incident yellow fluorescent light as red light; green phosphor segments and yellow phosphor segments are arranged on the phosphor wheel so that two sequences of time-division light are emitted when the phosphor wheel rotates once, the first, second, and third segments are arranged on the color wheel so that the color wheel emits two sequences of time-division light when it makes one revolution; The light source device according to claim 1 .

5. The control unit, in the second segment, In the first rotation mode, the blue excitation light is transmitted; In the second rotation mode, control is performed to transmit the yellow fluorescent light. The light source device according to claim 4 .

6. The control unit, in the third segment, In the first rotation mode and the second rotation mode, the yellow excitation light is transmitted. The light source device according to claim 5 .

7. A light source device according to any one of claims 1 to 6, Projection-type image display device.

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