Projection-type image display device

Abstract

This spectroscopic 3D video display device is provided with: at least one first projection video display device that displays a video using first illumination light; at least one second projection-type image display device that displays an image using the second illumination light; and a system control unit that performs control so as to synchronously drive the first projection-type video display device and the second projection-type video display device. The light source device of the first projection-type image display device emits first blue light having a center wavelength [lambda] a at a predetermined output power and emits at least one third blue light by switching the intensity of the output power, and the light source device of the second projection-type image display device emits second blue light having a center wavelength [lambda] b at a predetermined output power. The central wavelengths [lambda] a, [lambda] b, and [lambda] c satisfy [lambda] b < = [lambda] c < [lambda] a.

Description

Technical Field

[0001] The present disclosure relates to a projection type image display device, and more particularly to a spectroscopic 3D image display device. Background Art

[0002] Conventionally, a device capable of displaying a stereoscopic image has been proposed in a projection type image display device. For example, Patent Document 1 discloses a spectroscopic 3D image display device. This spectroscopic 3D image display device has, for example, Figure 8 The structure shown. Figure 8 1 is a schematic top view showing the structure of a spectroscopic 3D image display device. As shown in the figure, the spectroscopic 3D image display device 101 has two projectors 101a and 101b, and the projectors 101a and 101b are configured to respectively overlap the left-eye image and the right-eye image of the viewer on the same screen 103 for projection. In addition, the projector 101a generates the left-eye image using colored light having wavelengths RL (red light), GL (green light), and BL (blue light) in multiple color bands. The projector 101b generates the right-eye image using colored light having wavelengths RR (red light), GR (green light), and BR (blue light) in each color band that are different from the colored light having wavelengths RL, GL, and BL used to generate the left-eye image.

[0003] The viewer observes through 3D glasses 105, and the 3D glasses 105 are configured so that the lens 105a of the left eye does not pass the image projected by the projector 101b, and the lens 105b of the right eye does not pass the image projected by the projector 101a. As a result, the image on the screen 103 is recognized as a three-dimensional image based on binocular parallax. In such a spectroscopic 3D image display device, a plurality of projection type image display devices (projectors) are used, and in order to achieve good viewing, the brightness of the image light is required to be uniform for each projection type image display device.

[0004] In addition, in a projection type image display device, in order to obtain various colored lights for generating images, a blue laser light source is used, and the blue light output from the light source is irradiated onto a phosphor as excitation light to cause the phosphor to emit light, thereby obtaining colored lights such as red light and green light.

[0005] Prior Art Literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent Application No. 2019-537742 Summary of the invention

[0008] In a spectroscopic 3D image display device such as Patent Document 1, two projection image display devices that generate binocular images are respectively constructed using light sources that emit light with a given wavelength difference, such as laser light sources that emit blue light with a center wavelength of 465nm and blue light with a center wavelength of 445nm. However, the emission efficiency of the phosphor used to generate red light, green light, and other colored light varies depending on the wavelength of the blue light used as the excitation light. Fig. 9 This is a graph showing an example of changes in the fluorescence yield of a phosphor used in a projection type image display device depending on the excitation wavelength, and shows the fluorescence yields of two types of phosphors F1 and F2 depending on the excitation wavelength.

[0009] like Fig. 9 As shown, the fluorescent substance F1 or the fluorescent substance F2 has a fluorescence yield Yb of about 99% near the excitation wavelength of 445nm. In contrast, near the excitation wavelength of 465nm, the fluorescence yields Ya1 and Ya2 of the fluorescent substances F1 and F2 are respectively about 92% and 87%, which are significantly lower than the fluorescence yield Yb near the excitation wavelength of 445nm. Therefore, among the two projection-type image display devices, the projection-type image display device formed by using a blue laser light source with a central wavelength of 465nm produces a decrease in the brightness of the image light due to the decrease in the emission efficiency of the red light, green light and other colored light. In this way, in the spectroscopic 3D image display device, due to the difference in the fluorescence yield of the fluorescent substance caused by the difference in the wavelength of the emitted light of the light source of the projection-type image display device that generates the image for both eyes, the brightness is uneven between the image lights for both eyes, which will affect the viewing experience.

[0010] Therefore, an object of the present disclosure is to solve the above-mentioned problem and to provide a spectroscopic 3D image display device capable of improving the brightness uniformity of image light for both eyes.

[0011] In order to achieve the above-mentioned purpose, the spectroscopic 3D image display device involved in the present disclosure is a spectroscopic 3D image display device, which comprises: at least one first projection type image display device, which uses a first illumination light including color light of multiple color bands to project an image for one of the viewer's eyes onto a projection object; at least one second projection type image display device, which uses a second illumination light including color light of multiple color bands having wavelengths different from the color light of the color band of the first illumination light to project an image for the other of the two eyes onto the projection object, so that the image for the other of the two eyes overlaps with the image for one of the two eyes; and a system control unit, which controls so that the first projection type image display device and the second projection type image display device are synchronously driven, the first projection type image display device and the second projection type image display device respectively comprising: a light source device, which emits blue light; and a light modulation element, which modulates the incident color light of multiple color bands according to an image signal. inter-modulation to generate projection light corresponding to the image signal; an illumination optical system to time-divisionally emit blue light obtained by transmitting the light emitted by the light source device and fluorescence excited by the light emitted by the light source device, and guide the blue light to the light modulation element; and a projection optical system to amplify and project the projection light of the light modulation element to the projection object to display the image. The light source device of the first projection type image display device performs the following actions under the control of the system control unit: emits a first blue light with a central wavelength λa at a given output power, and when the illumination optical system emits blue light, emits a third blue light with at least one central wavelength λc at the first output power, the first output power being lower than the given output power, and when the illumination optical system emits fluorescence, emits the third blue light with a second output power higher than the first output power. The light source device of the second projection type image display device emits a second blue light with a central wavelength λb at the given output power under the control of the system control unit, and the central wavelengths λa, λb and λc satisfy λb≤λc<λa.

[0012] According to the spectroscopic 3D image display device according to one aspect of the present disclosure, it is possible to improve the brightness uniformity of image light for both eyes. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a block diagram showing an example of the overall configuration of a spectroscopic 3D image display device according to an embodiment of the present disclosure.

[0014] Figure 2 is a schematic diagram showing an example of the structure of a projection type image display device according to Example 1 of the embodiment, and is an illustrative diagram showing Figure 1 A diagram showing the structure of a projection-type image display device of a spectroscopic 3D image display device.

[0015] Figure 3 It is shown Figure 2 FIG. 4 is a diagram showing an example of the structure of a fluorescent wheel of a projection type image display device.

[0016] Figure 4 is Figure 1 FIG. 1 is a diagram showing an example of synchronous control of the operation of a light source device of a projection type image display device and the rotation of a fluorescent substance wheel in a spectroscopic type 3D image display device.

[0017] Figure 5 It is shown Figure 2 A graph showing the spectral characteristics of a spectral element of a projection type image display device.

[0018] Figure 6 is a schematic diagram showing an example of the structure of a projection type image display device according to Example 2 of the embodiment, and is an illustrative diagram showing Figure 1 A diagram showing the structure of a projection-type image display device of a spectroscopic 3D image display device.

[0019] Figure 7 It is shown Figure 6 FIG. 1 is a diagram showing an example of the structure of a color wheel of a projection type image display device.

[0020] Figure 8 This is a schematic plan view showing the structure of a spectroscopic 3D image display device.

[0021] Fig. 9 This is a graph showing an example of changes in the fluorescence yield of a phosphor used in a projection type image display device depending on the excitation wavelength. DETAILED DESCRIPTION

[0022] According to the first embodiment of the present disclosure, a spectroscopic 3D image display device comprises: at least one first projection type image display device, which uses a first illumination light including light of multiple color bands to project an image for one of the viewer's eyes onto a projection object; at least one second projection type image display device, which uses a second illumination light including light of multiple color bands having wavelengths different from the color light of the color band of the first illumination light, to project an image for the other of the two eyes onto the projection object, so that the image for the other of the two eyes overlaps with the image for one of the two eyes; and a system control unit, which controls the first projection type image display device and the second projection type image display device to be synchronously driven, the first projection type image display device and the second projection type image display device respectively comprising: a light source device, which emits blue light; and a light modulation element, which spatially modulates the incident color light of multiple color bands according to an image signal to generate a color image that overlaps with the image signal. a projection light corresponding to a number; an illumination optical system that emits blue light obtained by transmitting the light emitted by the light source device and fluorescence excited by the light emitted by the light source device in a time-sharing manner, and guides the blue light, which is obtained by transmitting the light emitted by the light source device, and the fluorescence excited by the light emitted by the light source device, and guides the blue light to the light modulator; and a projection optical system that amplifies and projects the projection light of the light modulator onto the projection object to display an image. The light source device of the first projection type image display device emits a first blue light with a central wavelength λa at a given output power under the control of a system control unit. When the illumination optical system emits blue light, it emits a third blue light with at least one central wavelength λc at the first output power, and the first output power is lower than the given output power. When the illumination optical system emits fluorescence, it emits the third blue light at a second output power higher than the first output power. The above-mentioned light source device of the second projection type image display device emits a second blue light with a central wavelength λb at a given output power under the control of a system control unit, and the central wavelengths λa, λb and λc satisfy λb≤λc<λa.

[0023] According to this aspect, the brightness uniformity of the image light for both eyes can be improved.

[0024] According to the second embodiment of the present disclosure, a spectroscopic 3D image display device is provided. In the spectroscopic 3D image display device described in the first embodiment, a light source device of a second projection-type image display device emits a second blue light with a central wavelength λb and a fourth blue light with at least one central wavelength λd, and the central wavelengths λa, λb and λd satisfy λb<λd≤λa. The light source device of the second projection-type image display device is controlled by a system control unit to emit a fourth blue light with a third output power when an illumination optical system emits blue light, and the third output power is lower than a given output power. When the illumination optical system emits fluorescence, the fourth blue light is emitted with a fourth output power higher than the third output power.

[0025] According to the third aspect of the present disclosure, a spectroscopic 3D image display device is provided. In the spectroscopic 3D image display device described in the first or second aspect, the first output power of the third blue light is less than 50% of the output power of the first blue light and the second blue light.

[0026] According to the fourth embodiment of the present disclosure, a spectroscopic 3D image display device is provided. In the spectroscopic 3D image display device described in the first or second embodiment, the light source device of the first projection type image display device turns off the third blue light when emitting the third blue light at the first output power, and turns on the third blue light when emitting the third blue light at the second output power.

[0027] According to a fifth aspect of the present disclosure, a spectroscopic 3D image display device is provided. In the spectroscopic 3D image display device described in the second aspect, a third output power of the fourth blue light is less than 50% of the output power of the first blue light and the second blue light.

[0028] According to the 6th embodiment of the present disclosure, a spectroscopic 3D image display device is provided. In the spectroscopic 3D image display device described in the 2nd embodiment, the light source device of the second projection type image display device turns off the 4th blue light when emitting the 4th blue light at the 3rd output power, and turns on the 4th blue light when emitting the 4th blue light at the 4th output power.

[0029] According to the 7th embodiment of the present disclosure, a spectroscopic 3D image display device is provided. In the spectroscopic 3D image display device described in any one of the 1st to 6th embodiments, the illumination optical system has a phosphor wheel, the phosphor wheel includes a first region and a second region arranged along a rotation direction, the first region transmits blue light from a light source device, the second region has a phosphor layer that is excited by the blue light from the light source device to emit fluorescence, the emitted light of the light source device is alternately incident on the first region and the second region by the rotation of the phosphor wheel, and the system control unit controls the above-mentioned light source device to operate synchronously and periodically with the rotation of the phosphor wheel.

[0030] According to the 8th embodiment of the present disclosure, a spectroscopic 3D image display device is provided. In the spectroscopic 3D image display device recorded in any one of the 1st to 7th embodiments, the illumination optical system includes: a spectroscopic element that receives light emitted in a time-sharing manner, transmits colored light of multiple color bands and guides them to a light modulation element, the spectroscopic element of the first projection type image display device transmits the colored light of the first illumination light and reflects the colored light of the second illumination light, and the spectroscopic element of the second projection type image display device transmits the colored light of the second illumination light and reflects the colored light of the first illumination light.

[0031] According to the 9th embodiment of the present disclosure, a spectroscopic 3D image display device is provided. In the spectroscopic 3D image display device described in the 8th embodiment, a wavelength separation coating is applied to the spectroscopic element, and the wavelength separation coating of the spectroscopic element of the first projection type image display device has a transmittance of more than 90% near the wavelength of the color light of each color band of the first illumination light, and has a reflectivity of more than 95% near the wavelength of the color light of each color band of the second illumination light. The wavelength separation coating of the spectroscopic element of the second projection type image display device has a transmittance of more than 90% near the wavelength of the color light of each color band of the second illumination light, and has a reflectivity of more than 95% near the wavelength of the color light of each color band of the first illumination light.

[0032] According to the 10th embodiment of the present disclosure, a spectroscopic 3D image display device is provided. In the spectroscopic 3D image display device described in any one of the 1st to 9th embodiments, the illumination optical system further includes a color wheel for receiving blue light and fluorescence, the color wheel has a plurality of color light segments arranged along a rotation direction, each color light segment has a color separation layer for transmitting light of a given color band among incident light, the blue light and fluorescence are incident on each color light segment in sequence through the rotation of the color wheel, and the light of the plurality of color bands transmitted through the color separation layer is emitted in a time-division manner.

[0033] In addition, by appropriately combining any of the various embodiments described above, the effects possessed by each can be achieved.

[0034] Hereinafter, the embodiments are described in detail with reference to the accompanying drawings as appropriate. However, unnecessary detailed descriptions are sometimes omitted. For example, detailed descriptions of known matters and repeated descriptions of substantially the same structures are sometimes omitted. This is to avoid the following description from becoming unnecessarily lengthy and to make it easy for those skilled in the art to understand.

[0035] Reference Figures 1 to 7 The following is a description of the spectroscopic 3D image display device and the projection image display device of the spectroscopic 3D image display device according to the embodiment of the present disclosure. 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 technical solution. In addition, in each figure, each element is exaggerated for ease of explanation. In addition, the same symbols are given to substantially the same components in the drawings.

[0036] Implementation Method

[0037] (Structure of a spectroscopic 3D image display device)

[0038] Reference Figure 1 The overall structure of the spectroscopic 3D image display device according to the embodiment of the present disclosure will be described. Figure 1 1 is a block diagram showing an example of the overall configuration of a spectroscopic 3D image display device 700 according to an embodiment of the present disclosure.

[0039] like Figure 1 As shown, the spectroscopic 3D image display device 700 of this embodiment is composed of a projection image display device 600a, a projection image display device 600b and a system control unit 100. The projection image display devices 600a and 600b respectively include: light source devices 200a and 200b; illumination optical systems 300a and 300b; light modulation elements 400a and 400b; and projection optical systems 500a and 500b. The two projection image display devices 600a and 600b have the same structure. However, the projection image display device 600a is different from the projection image display device 600b in the following aspects. That is, the light source device 200a is composed of a laser light source that emits blue light LBa, while the light source device 200b is composed of a laser light source that emits blue light LBb having a wavelength different from that of the blue light LBa.

[0040] The system control unit 100 includes a synchronization control unit 110, a light source control unit 120, an illumination optical system control unit 130, and a light modulator control unit 140. The system control unit 100 includes, for example, a CPU, a ROM, a RAM, etc. (not shown), and the CPU and the RAM cooperate to execute the program stored in the ROM, thereby realizing the control function of each unit. The synchronization control unit 110 sends a synchronization signal to the light source control unit 120, the illumination optical system control unit 130, and the light modulator control unit 140 to synchronously drive the projection type image display devices 600a and 600b. As a result, colored lights of different wavelengths can be emitted synchronously and in a time-division manner to display images Va and Vb for both eyes. For example, the synchronization control unit 110 can synchronously control the cycle of the light source control unit 120 to operate the light source devices 200a and 200b, the cycle of the illumination optical system control unit 130 to rotate the fluorescent body wheel of the illumination optical system 300a and 300b, and the cycle of the light modulator control unit 140 to shift the light modulators 400a and 400b.

[0041] In the spectroscopic 3D image display device 700 configured in this way, the projection image display devices 600a and 600b can use illumination light including a plurality of color bands having different wavelengths in each color band to overlap the image Va for the left eye and the image Vb for the right eye of the viewer on the same projection object 50 for projection. When the viewer observes through 3D glasses (not shown), the images Va and Vb on the projection object 50 are recognized as three-dimensional images due to the binocular parallax of the viewer. In addition, Figure 1The spectroscopic 3D image display device 700 shown is not limited to having two projection image display devices 600a and 600b. For example, the spectroscopic 3D image display device 700 may be formed by two sets of projection image display devices including two or more projection image display devices 600a and two or more projection image display devices 600b.

[0042] (Structure of projection type image display device according to embodiment 1)

[0043] Figure 1 The projection type image display devices 600a and 600b included in the spectroscopic 3D image display device 700 have the same structure. Figure 2 An example of the structure of the projection type image display apparatuses 600a and 600b will be described. Figure 2 is a schematic diagram showing the structure of a projection type image display device 600 according to Example 1 of the embodiment, and is an exemplary diagram showing Figure 1 FIG. 7 is a diagram showing the structure of projection type image display devices 600a and 600b of the spectroscopic type 3D image display device 700. Figure 2 In the diagram, only the principal ray is used to represent each light beam.

[0044] like Figure 2 As shown, the projection type image display device 600 involved in Example 1 of this embodiment includes: a light source device 200, an illumination optical system 300, a light modulation element 400 and a projection optical system 500. In the projection type image display device 600 shown in the figure, the same structural elements in the projection type image display device 600a and 600b are represented by the same symbols. For structural elements with different characteristics in the projection type image display device 600a and the projection type image display device 600b, the structural elements corresponding to the projection type image display device 600a and the projection type image display device 600b are recorded together. For example, the laser elements 201A, 201B and the spectroscopic element 230 are recorded together with the laser elements 201a, 201c and the spectroscopic element 230a corresponding to the projection type image display device 600a, and the laser elements 201b, 201d and the spectroscopic element 230b corresponding to the projection type image display device 600b.

[0045] <Light source device>

[0046] The light source device 200 is composed of a plurality of semiconductor lasers in order to achieve high-brightness emitted light. In the present embodiment, the light source device 200 uses a plurality of semiconductor laser elements 201 that emit blue light, and the semiconductor laser elements 201 and the respective focusing lenses 203 can be arranged in a matrix at fixed intervals on a heat sink (not shown), for example. In addition, in the spectroscopic 3D image display device 700 involved in the present embodiment, the semiconductor laser element 201 used in the light source device of the projection type image display device includes a laser element 201A and a laser element 201B. The laser element 201A and the laser element 201B can be composed of blue semiconductor laser elements that emit blue light having different central wavelengths.

[0047] In this embodiment, the light source device of the projection type image display device 600a is composed of a laser element 201a and a laser element 201c. The laser element 201a emits blue light with a central wavelength λa, and the laser element 201c emits blue light with a central wavelength λc. In addition, the main wavelength of the blue color light used to display the image Va for the left eye based on the projection type image display device 600a is λa, which is mainly formed by the blue light of the laser element 201a. In order to excite the fluorescent body in the projection type image display device 600a to emit fluorescence containing red light, green light and other colored light, the blue light based on the central wavelength λa of the laser element 201a and the blue light based on the central wavelength λc of the laser element 201c are used.

[0048] On the other hand, the light source device of the projection type image display device 600b is composed of a laser element 201b and a laser element 201d. The laser element 201b emits a blue light with a central wavelength λb. The laser element 201d emits a blue light with a central wavelength λd. In addition, the main wavelength of the blue color light used to display the image Vb for the right eye based on the projection type image display device 600b is λb, which is mainly formed by the blue light of the laser element 201b. In order to excite the fluorescent body in the projection type image display device 600b to emit fluorescence containing red light, green light and other color lights, the blue light based on the central wavelength λb of the laser element 201b and the blue light based on the central wavelength λd of the laser element 201d are used.

[0049] Thus, in the spectroscopic 3D image display device 700 involved in the present disclosure, the light source devices of the two projection-type image display devices are respectively configured to include two kinds of laser elements. Hereinafter, for the sake of convenience of explanation, the laser element 201a that emits blue light of the center wavelength λa for forming the blue light of the projection-type image display device 600a and the laser element 201b that emits blue light of the center wavelength λb for forming the blue light of the projection-type image display device 600b are referred to as "the first light source". The laser element 201c that emits blue light of the center wavelength λc and the laser element 201d that emits blue light of the center wavelength λd are referred to as "the second light source". In addition, in this specification, the blue light of the center wavelengths λa, λb, λc, and λd are also referred to as "the first blue light", "the second blue light", "the third blue light", and "the fourth blue light", respectively. In addition, such a term is only for the purpose of making the present disclosure easy to understand, and is not intended to limit the present disclosure thereby.

[0050] Thus, in this embodiment, the light source device 200 of the projection type image display device 600a, 600b is composed of a light source 201 including first light sources 201a, 201b and second light sources 201c, 201d. The light source 201 of the projection type image display device 600a emits blue light LBa including central wavelengths λa and λc, and the light source 201 of the projection type image display device 600b emits blue light LBb including central wavelengths λb and λd.

[0051] In order to form a 3D image, the spectroscopic 3D image display device 700 can set the central wavelength λa of the first light source 201a of the projection image display device 600a to 465nm, and the central wavelength λb of the first light source 201b of the projection image display device 600b can be set to 445nm, but it is not limited to this. In addition, the central wavelength λc of the second light source 201c of the projection image display device 600a is configured to satisfy λb≤λc<λa, and the central wavelength λd of the second light source 201d of the projection image display device 600b can be configured to satisfy λb<λd≤λa. Here, the second light source 201c and the second light source 201d of the projection image display devices 600a and 600b can be laser elements that emit blue light of the same central wavelength or laser elements that emit blue light of different central wavelengths. In this embodiment, the second light source 201c and the second light source 201d are configured by laser elements that emit blue light of the same central wavelength, and the central wavelengths λc and λd are both 455nm.

[0052] In this embodiment, the projection type image display device 600a and 600b are respectively configured to have a first light source and a second light source, but the present disclosure is not limited to this. For example, the projection type image display device 600a can also be configured to have a first light source and a second light source, and the projection type image display device 600b can only be configured by the first light source. Furthermore, one or both of the projection type image display device 600a and the projection type image display device 600b can also be configured to include a first light source and two or more second light sources.

[0053] The blue laser light LB emitted from the light source 201 is collimated by the collimator lens 202 , emitted from the light source device 200 in the −X direction in the figure as substantially parallel light, and enters the illumination optical system 300 .

[0054] <Illumination optical system>

[0055] The illumination optical system 300 is composed of the following components: lenses 203, 205; a diffuser 204; a dichroic mirror 210; lenses 206, 207, 208, 209; a phosphor wheel 250; reflectors 211, 212, 213; lenses 221, 222, 223, 224; a rod integrator 225; lenses 226, 227; and a spectroscopic element 230. The illumination optical system 300 is configured to guide the emitted light of the light source device 200 to the light modulation element.

[0056] The blue laser light LB incident from the light source device 200 is focused by the lens 203 , passes through the diffuser 204 , is substantially collimated again by the lens 205 , travels along the optical axis Oa, and is incident on the dichroic mirror 210 arranged at an inclination angle of approximately 45 degrees to the optical axis Oa.

[0057] The dichroic mirror 210 has the characteristic of reflecting the blue laser light LB of the light source 201 and transmitting the light of other wavelength bands. The blue laser light LB incident in the -X direction in the figure is reflected by the dichroic mirror 210, emitted in the +Y direction in the figure, travels along the optical axis Ob, is focused by the lenses 206 and 207, and is incident on the fluorescent wheel 250.

[0058] <Fluorescent wheel>

[0059] Reference Figure 3 The structure of the fluorescent substance wheel 250 will be described. Figure 3 It is shown Figure 2 FIG. 2 is a diagram showing an example of the structure of the fluorescent wheel 250 of the projection type image display device 600. Figure 3 (a) shows Figure 2 The side surface of the phosphor wheel 250 on the XY plane, Figure 3 (b) shows that Figure 2The front side of the fluorescent wheel 250 faces the -Y direction on the XZ plane of the fluorescent wheel 250. The fluorescent wheel 250 is configured to emit blue light obtained by transmitting the light emitted by the light source device 200 and fluorescent light excited by the light emitted by the light source device 200 in a time-division manner by rotating.

[0060] like Figure 3 As shown, the fluorescent substance wheel 250 is composed of a motor 251 in the center and a disc-shaped rotating substrate 252 which is rotationally driven by the motor 251 .

[0061] exist Figure 3 On the surface of the rotating substrate 252 shown in (b), an annular region 253 having an outer diameter R and a width W in the radial direction is formed along the circumferential direction, and the annular region 253 is composed of an opening region 254 and a phosphor layer region 255. The opening region 254 transmits the incident blue laser LB. In the phosphor layer region 255, a phosphor layer that is excited by the incident blue laser LB to emit fluorescence is formed. In the present embodiment, the phosphor layer region 255 is composed of a red phosphor portion 255a and a green phosphor portion 255b formed along the circumferential direction. The red phosphor portion 255a is excited by the incident blue laser LB to emit red fluorescence. The green phosphor portion 255b is excited by the incident blue laser LB to emit green fluorescence.

[0062] also, Figure 3 (b) shows that the phosphor layer region 255 of the phosphor wheel 250 includes two types of phosphor parts, but the present disclosure is not limited thereto. For example, the phosphor layer region of the phosphor wheel 250 may include one type or three or more types of phosphor parts.

[0063] The phosphor wheel 250 configured in this way rotates in the illustrated rotation direction A by the drive of the motor 251 controlled by the illumination optical system control unit 130. The incident blue laser light LB is alternately incident on the opening region 254 and the phosphor layer region 255 by the rotation of the phosphor wheel 250. For example, at the start of rotation T01, the phosphor wheel 250 rotates in the A direction from the boundary position C1 between the opening region 254 and the red phosphor portion 255a. During the rotation time T1 to the boundary position C2 between the opening region 254 and the green phosphor portion 255b, the opening region 254 receives light, and blue light is transmitted and emitted. The phosphor wheel 250 further rotates in the A direction, and during the rotation time T2 from the boundary position C2 to the boundary position C1, the phosphor layer region 255 receives light. Green fluorescence based on the green phosphor portion 255b and red fluorescence based on the red phosphor portion 255a are sequentially emitted and emitted. In this way, during one rotation of the fluorescent wheel 250, blue light, green fluorescence, and red fluorescence are emitted in a time-sharing manner. In this embodiment, the system control unit 100 can control the light source device 200 to operate synchronously with the rotation of the fluorescent wheel 250 and periodically. The light source device 200 can emit light with a given output power according to the control of the system control unit 100, and the second light source can emit light with the output power switched between strong and weak. Figure 4 This synchronization control of the operation of the light source device 200 and the rotation of the fluorescent substance wheel 250 performed by the system control unit 100 will be described.

[0064] <Synchronous control of the operation of the light source device and the rotation of the phosphor wheel>

[0065] Figure 4 is Figure 1 The figure shows an example of synchronous control of the operation of the light source device 200 of the projection type image display device 600 and the rotation of the fluorescent body wheel 250 in the spectroscopic type 3D image display device 700. Figure 4 In the figure, an example of the behavior of the synchronization control signal (a) of the synchronization control unit 110 of the system control unit 100 of the spectroscopic 3D image display device 700 according to the embodiment of the present disclosure, the output control of the first light source (b) and the output control of the second light source (c) by the light source control unit 120, and the rotation control of the phosphor wheel (d) by the illumination optical system control unit 130 are shown. Figure 4 (a) to Figure 4 In (d), the horizontal axis represents the passage of time during which the fluorescent body wheel rotates three times.

[0066] In the present embodiment, the synchronization control unit 110 of the system control unit 100 transmits synchronization signals S1 and S2 to the light source control unit 120 and the illumination optical system control unit 130, so that the output control of the light source device 200 by the light source control unit 120 and the rotation control of the fluorescent substance wheel 250 by the illumination optical system control unit 130 can be synchronized. The synchronization signals S1 and S2 are not limited thereto, and can be transmitted based on, for example, a trigger based on detection information of the emitted light of the fluorescent substance wheel 250. For example, the light emitted from the fluorescent substance wheel 250 is detected by a light sensor (not shown), and the detection information of the light is transmitted to the synchronization control unit 110. Within the rotation cycle of the fluorescent substance wheel 250, at the beginning T01 of the rotation time T1, Figure 3 The opening area 254 shown starts to receive light. At this time, the synchronization control unit 110 can send the synchronization signal S1 based on the detection information of the blue light. In addition, at the beginning of time T2 T02, Figure 3 The phosphor layer region 255 shown starts to receive light. At this time, the synchronization control unit 110 can transmit the synchronization signal S2 based on the detection information of the green light.

[0067] like Figure 4 As shown, at the beginning T01 of the rotation time T1, the synchronization control signal S1 based on the synchronization control unit 110 is sent to the light source control unit 120. The light source control unit 120 that receives the synchronization control signal S1 controls the first light sources 201a and 201b so that the first light sources 201a and 201b of the light source device 200 of the projection type image display device 600 emit blue light with central wavelengths λa and λb at output power Pm, and controls the second light sources 201c and 201d so that the second light sources 201c and 201d emit blue light with central wavelengths λc and λd at low output power Ps1. At this time, the low output power Ps1 of the blue light based on the second light source is lower than the output power Pm of the blue light based on the first light source.

[0068] Next, during the period T1 during which the opening area 254 receives light, the opening area 254 of the fluorescent body wheel 250 receives light, and blue light is transmitted and emitted. At this time, the blue light of the center wavelengths λa and λb based on the first light source is emitted at the output power Pm, while the blue light of the center wavelengths λc and λd based on the second light source is emitted at the low output power Ps1. Thus, blue light having the main wavelengths λa and λb, respectively, for displaying the images Va and Vb based on the projection type image display devices 600a and 600b can be formed. In this embodiment, the blue light of the center wavelength λa of 465nm for displaying the image Va and the blue light of the center wavelength λb of 445nm for displaying the image Vb are emitted.

[0069] Next, at the beginning of time T2, a synchronization control signal S2 based on the synchronization control unit 110 is sent to the light source control unit 120. The light source control unit 120 that receives the synchronization control signal S2 controls the first light sources 201a and 201b so that the first light sources 201a and 201b of the light source device 200 of the projection type image display device 600 emit blue light of central wavelengths λa and λb at output power Pm, and controls the second light sources 201c and 201d so that the second light sources 201c and 201d emit blue light of central wavelengths λc and λd at high output power Ps2. In addition, the high output power Ps2 of the second light sources 201c and 201d is an output power higher than the low output power Ps1.

[0070] Next, during the period T2 when the phosphor layer region 255 receives light, the phosphor layer region 255 of the phosphor wheel 250 receives light and emits fluorescence. At this time, the blue light of the central wavelengths λa and λb based on the first light source and the blue light of the central wavelengths λc and λd based on the second light source have output powers Pm and Ps2, respectively, and are incident on the phosphor layer, exciting the phosphor to emit fluorescence.

[0071] Thus, in the present embodiment, as the fluorescent body wheel 250 rotates, the synchronization control unit 110 repeatedly sends the synchronization control signals S1 and S2 to the light source control unit 120, so that the operation of the light source device of the projection type image display device 600a, 600b is synchronized with the rotation of the fluorescent body wheel 250. The light source control unit 120, which receives the synchronization control signals S1 and S2 from the synchronization control unit 110, controls the light source device 200 to operate periodically in synchronization with the rotation of the fluorescent body wheel 250. The light source device 200 can emit light with the output power Pm by the first light source under the control of the light source control unit 120, and emit light by periodically switching between the low output power Ps1 and the high output power Ps2 according to the area where the fluorescent body wheel 250 receives light.

[0072] The low output power Ps1 of the second light source is preferably less than 50% of the output power Pm of the first light source. The value of the high output power Ps2 of the second light source is not limited to the present disclosure. For example, the high output power Ps2 may be the same as the output power Pm of the first light source. In the present embodiment, when the second light source emits light with the high output power Ps2, the ratio of the output power of the first light source to that of the second light source can be set to about 55% to 45%. Thus, the emitted light of the first light source and the second light source can be used together to efficiently excite the phosphor layer of the phosphor wheel 250.

[0073] In this embodiment, the blue light based on the central wavelengths λc and λd of the second light source is blue light with a central wavelength of 455 nm. Fig. 9As shown, the fluorescent substance F1 or the fluorescent substance F2 has a fluorescence yield Yc of about 98% near the excitation wavelength of 455nm. Therefore, in the projection type image display device 600b, the light source device composed of a first light source with a wavelength of 445nm and a second light source with a wavelength of 455nm tends to have a slightly lower fluorescence yield than the case where only the first light source with a wavelength of 445nm of the same output power is used. On the other hand, in the projection type image display device 600a, the light source device composed of a first light source with a wavelength of 465nm and a second light source with a wavelength of 455nm can significantly increase the fluorescence yield ( Fig. 9 ). Therefore, when two projection type image display devices 600a and 600b respectively use only the first light sources of 465nm and 445nm to form the light source device, the difference in the fluorescence yield of the fluorescent body caused by the difference in the wavelength of the emitted light of the light source device is reduced by using the first light source and the second light source together to form the light source device. As a result, in the spectroscopic 3D image display device 700, the brightness uniformity of the image light for both eyes can be improved.

[0074] Furthermore, in the control of switching the output power of the second light source based on the light source control unit 120 to emit, it is possible to control so that during the period T1 of emitting blue light, the second light source is turned off (power off) and the output power is set to zero, and during the period T2 of emitting fluorescent light, the second light source is turned on (power on). Thus, the blue light is formed only by the blue light based on the first light source, the first light source and the second light source can be used together to efficiently excite the fluorescent body, and the brightness uniformity of the image light for both eyes can be improved.

[0075] That is, the situation in which the light source control unit 120 controls the second light source to switch the strength of the output power includes: controlling the second light source to switch between an "off" mode in which the output power is zero, i.e., a state in which the output is turned off, and a "lighting" mode, i.e., a state in which the output is turned on, to emit light.

[0076] In addition, Figure 4 2 shows that the output power Pm of the first light source does not change during the entire rotation cycle of the fluorescent body wheel 250, but the present disclosure is not limited to this. The output power Pm of the first light source can also change according to the application. In addition, in the present disclosure, the rotation frequency of the fluorescent body wheel is not limited. For example, in the present embodiment, the rotation frequency of the fluorescent body wheel 250 can be set to 120 Hz.

[0077] Next, return to Figure 2, the propagation of the light emitted in time division through the phosphor wheel 250 will be described. Of the red fluorescence and green fluorescence obtained from the phosphor layer region 255 of the phosphor wheel 250, one part is emitted from the phosphor wheel 250 in the -Y direction, and the other part is emitted in the +Y direction, and is reflected by the rotating substrate 252 and emitted in the -Y direction. These red fluorescence and green fluorescence are collimated by the lenses 207 and 206, pass through the dichroic mirror 210, are condensed by the condenser lens 224, and are incident on the rod integrator 225.

[0078] On the other hand, the blue light having passed through the opening region 254 of the fluorescent wheel 250 travels along the path of the lenses 208, 209, the reflector 211, the lens 221, the reflector 212, the lens 222, the reflector 213, and the lens 223. It is reflected by the dichroic mirror 210, condensed by the condenser lens 224, and enters the rod integrator 225. Here, the lenses 221, 222, and 223 function as relay lenses.

[0079] Thus, the blue light, green fluorescence, and red fluorescence emitted by the fluorescent wheel 250 in a time-division manner are incident on the rod integrator 225 and are made uniform in the rod integrator 225. The light emitted from the rod integrator 225 is incident on the spectroscopic element 230 through the lenses 226 and 227. Figure 5 The structure of the light-splitting element 230 will be described.

[0080] <Spectral Element>

[0081] Figure 5 It is shown Figure 2 Graph showing the spectral characteristics of the spectral element 230 of the projection type image display device 600. In this embodiment, the spectral element 230 can be formed by applying a wavelength separation coating on a lens. Figure 5 In FIG. 6 , the transmission characteristics of the wavelength separation coating of the spectroscopic element 230 a of the projection type image display device 600 a are indicated by a dotted line, and the transmission characteristics of the wavelength separation coating of the spectroscopic element 230 b of the projection type image display device 600 b are indicated by a solid line.

[0082] In the spectroscopic 3D image display device 700, the projection image display devices 600a and 600b display images Va and Vb using illumination light Lsa and Lsb including light of a plurality of color bands having different wavelengths in each color band. Figure 5 The spectral characteristics shown in FIG. 1 are configured as colored lights of illumination lights Lsa and Lsb of the respective transmission projection type image display devices 600a and 600b and emitted from the illumination optical system 300 ( Figure 2 ).

[0083] like Figure 5As shown, the wavelength separation coating of the spectroscopic element 230a of the projection type image display device 600a has transmission areas TBa, TGa, and TRa, and the transmission areas TBa, TGa, and TRa have a transmittance of more than 90% near the wavelength of each color light LBa, LGa, and LRa of the illumination light Lsa of the projection type image display device 600a. In addition, the wavelength separation coating of the spectroscopic element 230a of the projection type image display device 600a has a reflectivity of more than 95% near the wavelength of each color light LBb, LGb, and LRb of the illumination light Lsb of the projection type image display device 600b. As a result, each color light of the illumination light Lsa of the projection type image display device 600a is transmitted through the spectroscopic element 230a and emitted from the illumination optical system 300. Each color light of the illumination light Lsb of the projection type image display device 600b is reflected by the spectroscopic element 230a.

[0084] On the other hand, the wavelength separation coating of the spectroscopic element 230b of the projection type image display device 600b has transmission areas TBb, TGb, and TRb, and the transmission areas TBb, TGb, and TRb have a transmittance of 90% or more near the wavelength of each color light LBb, LGb, and LRb of the illumination light Lsb of the projection type image display device 600b. In addition, the wavelength separation coating of the spectroscopic element 230b of the projection type image display device 600b has a reflectivity of 95% or more near the wavelength of the color light LBa, LGa, and LRa of the illumination light Lsa of the projection type image display device 600a. As a result, each color light of the illumination light Lsb of the projection type image display device 600b is transmitted through the spectroscopic element 230b and emitted from the illumination optical system 300. Each color light of the illumination light Lsa of the projection type image display device 600a is reflected by the spectroscopic element 230b.

[0085] Thus, according to Figure 5 Due to the different spectral characteristics of the spectral elements 230a and 230b shown, in each projection type image display device 600a and 600b, illumination light Lsa and Lsb including color light of a plurality of color bands having different wavelengths are emitted from the illumination optical system 300 and guided to the light modulation element. Figure 5 , the spectroscopic characteristics of the spectroscopic elements 230a and 230b that transmit light of three primary colors are shown, but the present disclosure is not limited thereto. For example, the spectroscopic element can be configured by a wavelength separation coating that transmits light of more color bands.

[0086] <Image display>

[0087] Next, return to Figure 2, the propagation of the illumination light Ls emitted from the illumination optical system 300 will be described. The projection type image display device 600 is a structural example of a single-panel projection type image display device using one DMD as a light modulation element. Figure 2 As shown, in this embodiment, each color light of the illumination light Ls is transmitted through the emission spectroscopic element 230 in a time-division manner and emitted from the illumination optical system 300. The emitted color light enters a TIR (total internal reflection) prism 450 composed of a pair of prisms including a first prism 451 and a second prism 452, and is introduced into a DMD (Digital Micromirror Device) as a light modulation element 400. The lens constituting the spectroscopic element 230 has a function of imaging the light from the emission surface of the rod integrator 225 on the DMD 400.

[0088] The light modulator (DMD) 400 can spatially modulate the incident color light of multiple color bands according to the image signal to generate projection light corresponding to the image signal. Specifically, the light modulator 400 is controlled by the light modulator control unit 140, and deflects the micromirror according to the image signal to separate the incident light into reflected light toward the projection optical system 500 and reflected light advancing toward the effective outer area of ​​the projection optical system 500. The projection light Lp reflected by the light modulator 400 is transmitted through the TIR prism 450 again and is incident on the projection optical system 500. The projection optical system 500 magnifies the projection light Lp and projects it onto a projection object such as a screen to display an image.

[0089] The projection type image display devices 600a and 600b of the spectroscopic 3D image display device 700 can respectively use illumination light Lsa and Lsb including color light having different wavelengths in each color band to form projection light Lpa and Lpb, and overlap the image Va for the left eye and the image Vb for the right eye of the viewer on the projection object for projection. The viewer observes through 3D glasses configured so that the left eye lens does not pass the image Vb for the right eye, and the right eye lens does not pass the image Va for the left eye, thereby the images Va and Vb on the same projection object are recognized as three-dimensional images due to binocular parallax.

[0090] Thus, in the spectroscopic 3D image display device 700 of the present disclosure, the projection image display device utilizes the first light source and the second light source, and switches and emits the output power of the second light source under the control of the system control unit, thereby improving the brightness uniformity of the image light for both eyes.

[0091] (Structure of projection type image display device according to embodiment 2)

[0092] Next, refer to Figure 6 Come to Figure 1Another example of the configuration of the projection type image display devices 600a and 600b included in the spectroscopic type 3D image display device 700 shown will be described. Figure 6 is a schematic diagram showing the structure of a projection type image display device 600A according to Example 2 of the embodiment, and is an illustrative diagram showing Figure 1 FIG. 7 is a diagram showing the structure of projection type image display devices 600 a and 600 b of a spectroscopic 3D image display device 700 .

[0093] Figure 6 The projection type image display device 600A according to the second embodiment shown in the figure is different from the first embodiment in that it further includes a color wheel 280. Figure 2 The projection type image display device 600 according to the first embodiment shown is different. Figure 6 In Figure 2 The same elements as those of the projection type image display device 600 are given the same reference numerals and their description is omitted. Figure 6 As shown in FIG. 2 , the color wheel 280 is disposed at a position where the light beam emitted from the fluorescent wheel 250A is focused by the focusing lens 224. Figure 7 The structure of the color wheel 280 will be described.

[0094] <Color wheel>

[0095] Figure 7 It is shown Figure 6 FIG. 2 is a diagram showing an example of the structure of the color wheel 280 of the projection type image display device 600A. Figure 7 (a) shows the Figure 6 The front side of the color wheel 280 faces the +Y direction on the XZ plane. Figure 7 (b) shows Figure 6 The color wheel 280 is a side surface of the color wheel 280 on the XY plane. The color wheel 280 is configured to receive the light emitted from the fluorescent wheel 250A, transmit the light of a plurality of color wavelength bands by rotating, and emit the light in a time-division manner.

[0096] In this embodiment, the fluorescent wheel 250A and Figure 3 The phosphor wheel 250 shown in FIG. 1 also has an opening region 254 and a phosphor layer region 255 (see FIG. 2 ). Figure 3 ). In the phosphor layer region 255 of the phosphor wheel 250A, a Ce-activated YAG-based yellow phosphor is formed, which emits yellow fluorescence containing green and red components when excited by blue laser. The representative chemical structure of the crystal matrix of this phosphor is Y 3 Al 5 O 12The central wavelength of the yellow fluorescence of the phosphor wheel 250A excited by the blue laser is 550 nm, and it has a wide wavelength range of about 500 nm to 700 nm, and includes multiple color light components such as green and red. The yellow fluorescence obtained in the phosphor layer region of the phosphor wheel 250A is collimated by lenses 207 and 206, passes through the dichroic mirror 210, is condensed by the condenser lens 224, and is incident on the color wheel 280.

[0097] like Figure 7 As shown, the color wheel 280 is composed of a transparent substrate 282 , a color separation layer 283 formed on the transparent substrate 282 , and a motor 281 for rotating the transparent substrate 282 .

[0098] The transparent substrate 282 has three color light segments SR, SG, and SB in the circumferential direction. In this embodiment, the color light segments SB of the color wheel 280 and the opening area 254 (see FIG. 2 ) of the fluorescent wheel 250A are connected. Figure 3 ) The color light segments SR and SG are adjacent to each other and are combined with the phosphor layer region 255 (refer to Figure 3 )correspond.

[0099] The color separation layer 283 is composed of a color separation layer 283R that transmits red light formed in the color light segment SR, a color separation layer 283G that transmits green light formed in the color light segment SG, and a color separation layer 283B that transmits blue light formed in the color light segment SB.

[0100] The color wheel 280 is controlled by the illumination optical system control section 130 to rotate synchronously with the fluorescent body wheel 250A in the rotation direction B. Therefore, the yellow fluorescent light and the blue light emitted from the fluorescent body wheel 250A are incident on the color light segments SG, SR, and SB of the color wheel 280 in sequence.

[0101] When the yellow fluorescence is incident on the color light segment SG of the color wheel 280, only the green color light component of the yellow fluorescence passes through the dichroic layer 283G and is emitted from the color wheel 280 as green color light. When the yellow fluorescence is incident on the color light segment SR of the color wheel 280, only the red color light component of the yellow fluorescence passes through the dichroic layer 283R and is emitted from the color wheel 280 as red color light.

[0102] In addition, the blue light transmitted through the opening region 254 of the fluorescent wheel 250A enters the color light segment SB of the color wheel 280 , transmits through the dichroic layer 283B, and is emitted from the color wheel 280 as blue color light.

[0103] Thus, the emitted light of the fluorescent wheel 250A is incident on each color light segment in sequence by the rotation of the color wheel 280, and the colored light of multiple color bands transmitted through the dichroic layer of each color light segment is emitted from the color wheel 280 in a time-division manner. Figure 7The color wheel 280 shown is shown as having color light segments of three primary colors, but the present disclosure is not limited to this. For example, the color wheel can be configured to have color light of other color bands in addition to the three primary colors, for example, color light segments of cyan, magenta, yellow, etc. By having a plurality of color light segments, the color reproducibility of the projection type image display device can be improved, and an image with excellent color reproducibility can be achieved.

[0104] The other structures of the projection type image display device 600A involved in the second embodiment are the same as those of the projection type image display device 600 involved in the first embodiment, so detailed description is omitted. The spectroscopic 3D image display device 700 having the projection type image display devices 600a and 600b having the structure of the projection type image display device 600A involved in the second embodiment can improve the brightness uniformity of the image light for both eyes.

[0105] In addition, in the above-mentioned embodiment, a digital micromirror device (DMD) is used as a light modulation element, but the present disclosure is not limited thereto. For example, a projection display device can also be configured using a liquid crystal panel.

[0106] As described above, the above-mentioned embodiments are described as an illustration of the technology disclosed in this application. In order to understand the technology involved in the present disclosure, drawings and detailed descriptions are provided. Therefore, among the structural elements recorded in the drawings and detailed descriptions, not only the structural elements necessary for solving the problem are included, but also structural elements that are not necessary for solving the problem in order to illustrate the above-mentioned technology. Therefore, it should not be directly determined that these non-essential structural elements are necessary just because they are recorded in the drawings and detailed descriptions.

[0107] The present disclosure is fully described in association with the preferred embodiments with reference to the accompanying drawings, but various changes can be made within the scope of the technical solution. Such changes and embodiments obtained by appropriately combining the means of the techniques disclosed in different embodiments are also included in the technical scope of the present disclosure.

[0108] Industrial Applicability

[0109] The present disclosure can be used in a 3D image display device and can be used in a projection-type image display device such as a projector.

[0110] -Explanation of symbols-

[0111] 50 Projection object

[0112] 100 System Control Department

[0113] 110 Synchronous control unit

[0114] 120 Light source control unit

[0115] 130 Illumination optical system control unit

[0116] 140 Light modulation element control unit

[0117] 200 Light source device

[0118] 201 Semiconductor laser element

[0119] 202 Collimating lens

[0120] 203, 205, 206, 207, 208, 209 lenses

[0121] 204 Diffuser Plate

[0122] 210 dichroic mirror

[0123] 211, 212, 213 Reflectors

[0124] 250 Fluorescent Wheel

[0125] 221, 222, 223, 224 lenses

[0126] 225 Rod Integrator

[0127] 226, 227 Lens

[0128] 230 Spectral Element

[0129] 254 Opening area

[0130] 255 Phosphor layer area

[0131] 280 Color Wheel

[0132] 300 Illumination Optics

[0133] 400 Light Modulation Device (DMD)

[0134] 451, 452 Prism

[0135] 450 TIR Prism

[0136] 500 Projection Optical System

[0137] 600, 600a, 600b Projection type image display device

[0138] 700 3D image display device.

Claims

1. A spectroscopic 3D image display device, comprising: at least one first projection type image display device projects an image for one of the eyes of a viewer onto a projection object using a first illumination light including color light of a plurality of color bands; at least one second projection type image display device projects an image for the other of the two eyes onto the projection object using second illumination light including light of a plurality of color bands having wavelengths different from the color band of the first illumination light in each color band so that the image for the other of the two eyes overlaps with the image for one of the two eyes; and The system control unit controls the first projection type image display device and the second projection type image display device to be synchronously driven. The first projection type image display device and the second projection type image display device respectively include: a light source device emitting blue light; A light modulator that spatially modulates incident color light of multiple color bands according to an image signal to generate projection light corresponding to the image signal; an illumination optical system that emits blue light obtained by transmitting the light emitted by the light source device and fluorescence excited by the light emitted by the light source device in a time-division manner and guides the blue light to the light modulation element; and The projection optical system magnifies and projects the projection light of the light modulator onto the projection object to display an image. The light source device of the first projection type image display device performs the following operations under the control of the system control unit: The first blue light with a central wavelength λa is emitted at a given output power. When the illumination optical system emits the blue light, it emits at least one third blue light having a central wavelength λc at a first output power, wherein the first output power is lower than the given output power. When the illumination optical system emits the fluorescent light, the third blue light is emitted at a second output power higher than the first output power. The light source device of the second projection type image display device emits the second blue light having the central wavelength λb at the given output power under the control of the system control unit. The central wavelengths λa, λb and λc satisfy λb≤λc<λa.

2. The spectroscopic 3D image display device according to claim 1, wherein: The light source device of the second projection type image display device emits the second blue light having the central wavelength λb and at least one fourth blue light having the central wavelength λd. The central wavelengths λa, λb and λd satisfy λb<λd≤λa, The light source device of the second projection type image display device performs the following operations under the control of the system control unit: When the illumination optical system emits the blue light, the fourth blue light is emitted at a third output power, and the third output power is lower than the given output power. When the illumination optical system emits the fluorescent light, the fourth blue light is emitted at a fourth output power higher than the third output power.

3. The spectroscopic 3D image display device according to claim 1 or 2, wherein: The first output power of the third blue light is less than or equal to 50% of the output power of the first blue light and the second blue light.

4. The spectroscopic 3D image display device according to claim 1 or 2, wherein: The light source device of the first projection type image display device performs the following operations: When the third blue light is emitted at the first output power, the third blue light is turned off, When the third blue light is emitted at the second output power, the third blue light is turned on.

5. The spectroscopic 3D image display device according to claim 2, wherein: The third output power of the fourth blue light is less than or equal to 50% of the output power of the first blue light and the second blue light.

6. The spectroscopic 3D image display device according to claim 2, wherein: The light source device of the second projection type image display device performs the following operations: When the fourth blue light is emitted at the third output power, the fourth blue light is turned off, When the fourth blue light is emitted at a fourth output power, the fourth blue light is turned on.

7. The spectroscopic 3D image display device according to claim 1 or 2, wherein: The illumination optical system comprises a phosphor wheel, The fluorescent wheel includes a first region and a second region arranged along a rotation direction, the first region transmitting the blue light from the light source device, and the second region having a fluorescent layer that is excited by the blue light from the light source device to emit the fluorescent light. The emitted light of the light source device is incident alternately on the first area and the second area due to the rotation of the fluorescent wheel. The system control unit controls the light source device to operate periodically in synchronization with the rotation of the fluorescent substance wheel.

8. The spectroscopic 3D image display device according to claim 1 or 2, wherein: The illumination optical system includes a spectroscopic element for receiving light emitted in a time-division manner, transmitting light of a plurality of color bands and guiding the light to the light modulation element, The light splitting element of the first projection type image display device transmits the color light of the first illumination light and reflects the color light of the second illumination light. The beam splitter of the second projection type image display device transmits the color light of the second illumination light and reflects the color light of the first illumination light.

9. The spectroscopic 3D image display device according to claim 8, wherein: The beam splitting element is coated with a wavelength separation coating. The wavelength separation coating of the spectroscopic element of the first projection type image display device has a transmittance of 90% or more near the wavelength of the color light of each color band of the first illumination light, and has a reflectance of 95% or more near the wavelength of the color light of each color band of the second illumination light, The wavelength separation coating of the spectroscopic element of the second projection type image display device has a transmittance of more than 90% near the wavelength of the color light of each color band of the second illumination light, and has a reflectivity of more than 95% near the wavelength of the color light of each color band of the first illumination light.

10. The spectroscopic 3D image display device according to claim 1 or 2, wherein: The illumination optical system further includes a color wheel for receiving the blue light and the fluorescent light. The color wheel has a plurality of color light segments arranged along the rotation direction, each of the color light segments has a color separation layer that transmits color light of a given color wavelength band among incident light. The blue light and the fluorescent light are sequentially incident on the respective color light segments due to the rotation of the color wheel, and the color lights of a plurality of color bands transmitted through the color separation layer are emitted in a time-division manner.

Images