Light source device and projection display device

Abstract

A light source device according to one embodiment of the present disclosure is provided with: a first light source unit that emits light in a first wavelength region; a wavelength conversion unit that is disposed on the optical path of the light in the first wavelength region, and emits light in a second wavelength region excited by the light in the first wavelength region emitted from the first light source unit, the second wavelength region being different from the first wavelength region; a polarization separation element that is disposed between the first light source unit and the wavelength conversion unit, and separates incident light on the basis of polarization; and a color separation element that is disposed between the first light source unit and the polarization separation element, and separates incident light on the basis of a wavelength region.

Description

[Technical field]

[0001] The present disclosure relates to a light source device used, for example, as illumination for a projection display device, and a projection display device including the light source device. [Background technology]

[0002] In recent years, projectors (projection display devices) use light source devices (illumination devices) that irradiate a phosphor with light from a solid light source such as a laser and output the fluorescent light as illumination light. In addition, by forming the phosphor on a reflective material such as a metal to form a so-called reflective configuration, it is possible to obtain a high output.

[0003] For example, Patent Document 1 discloses a small-sized light source device with high color purity and a wide color gamut, which is achieved by collecting and combining fluorescent light and light from a blue solid-state light source and a red solid-state light source in the same optical system. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2019-028442 A Summary of the Invention

[0005] Incidentally, in a light source device equipped with a wavelength conversion element that uses a phosphor as a light source, there is a demand for improvement in light extraction efficiency.

[0006] Therefore, it is desirable to provide a light source device and a projection display device that can improve the efficiency of extracting light with uniform polarization.

[0007] A light source device according to an embodiment of the present disclosure includes a first light source unit that emits light in a first wavelength range and a second light source unit that is disposed on an optical path of the light in the first wavelength range. R, a wavelength conversion unit that is excited by light in a first wavelength range emitted from a first light source unit and emits light in a second wavelength range different from the first wavelength range; and a R, A polarization splitter that splits incident light based on polarization, and a second light source unit disposed between the polarization splitter and the first light source unit. The light is transmitted through the polarizing beam splitter or reflected from the polarizing beam splitter. and a color separation element that separates the incident light based on its wavelength range.

[0008] A projection type display device according to an embodiment of the present disclosure includes a light source device, a light modulation element that modulates light emitted from the light source device, and a projection optical system that projects the light from the light modulation element. The light source device mounted in this projection type display device has the same components as the light source device according to the embodiment of the present disclosure.

[0009] In the light source device and the projection display device of the embodiment of the present disclosure, a polarization separation element that separates the incident light based on polarization is provided between the first light source unit and the wavelength conversion unit, and a color separation element that separates the incident light also based on the wavelength range is provided between the polarization separation element and the first light source unit, thereby improving the utilization efficiency of the fluorescence (light in the second wavelength range) emitted from the wavelength conversion unit. [Brief description of the drawings]

[0010] [Figure 1] 1 is a schematic diagram illustrating a configuration example of a light source device according to a first embodiment of the present disclosure. [Figure 2A] 1. FIG. 4 is a schematic plan view illustrating another configuration example of the wavelength conversion section illustrated in FIG. [Figure 2B] 2B is a schematic diagram illustrating a cross-sectional configuration of a wavelength conversion section illustrated in FIG. 2A. [Diagram 3] 10 is a schematic diagram illustrating a configuration example of a light source device according to a first modified example of the present disclosure. [Figure 4] 11 is a schematic diagram illustrating a configuration example of a light source device according to a second modified example of the present disclosure. FIG. [Diagram 5] 6 is a schematic diagram illustrating a configuration example of a light source device according to a second embodiment of the present disclosure. FIG. [Figure 6] FIG. 13 is a schematic diagram illustrating a configuration example of a light source device according to a third embodiment of the present disclosure. [Figure 7] 11 is a schematic diagram illustrating a configuration example of a light source device according to a third modification of the present disclosure. FIG. [Figure 8] 13 is a schematic diagram illustrating a configuration example of a light source device according to a fourth modified example of the present disclosure. FIG. [Figure 9] 13 is a schematic diagram illustrating a configuration example of a light source device according to a fifth modified example of the present disclosure. FIG. [Figure 10] 13 is a schematic diagram illustrating a configuration example of a light source device according to a sixth modified example of the present disclosure. FIG. [Figure 11] 11 is a diagram illustrating an example of the configuration of an angle adjustment mechanism that adjusts the angles of the polarization separation element and the color separation element illustrated in FIG. [Figure 12] 11 is a diagram illustrating another example of the configuration of the angle adjustment mechanism that adjusts the angles of the polarization separation element and the color separation element illustrated in FIG. [Figure 13] 13 is a schematic diagram illustrating a configuration example of a light source device according to a seventh modified example of the present disclosure. FIG. [Figure 14] 1 is a functional block diagram illustrating an overall configuration of a projection display device according to the present disclosure. [Figure 15] 15 is a schematic diagram illustrating an example of the configuration of an optical system of the projection display device shown in FIG. [Figure 16] 15 is a schematic diagram illustrating another example of the configuration of the optical system of the projection display device shown in FIG. [Figure 17] FIG. 1 is a schematic diagram illustrating an example of a configuration of a display system. [Figure 18] FIG. 18 is a functional block diagram of the display system shown in FIG. 17. [Figure 19] FIG. 13 is a schematic diagram illustrating another example of the configuration of the display system. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, the embodiments of the present disclosure will be described in detail with reference to the drawings. The following description is a specific example of the present disclosure, and the present disclosure is not limited to the following embodiment. Furthermore, the present disclosure is not limited to the arrangement, dimensions, dimensional ratios, etc. of each component shown in each drawing. The order of description is as follows. 1. First embodiment (an example of a light source device in which a polarization separation element is disposed between an excitation light source unit and a wavelength conversion unit, and a color separation element is disposed between the polarization separation element and the excitation light source unit) 1-1. Light source device configuration 1-2. Operating principle of the light source device 1-3. Actions and Effects 2. Variations 2-1. Modification 1 (Example in which the excitation light source unit and the assist light source unit are arranged at an angle) 2-2. Modification 2 (Example in which an excitation light source unit and a wavelength conversion unit are arranged opposite each other) 3. Second embodiment (example in which a polarization conversion element is further disposed between the polarization separation element and the wavelength conversion unit) 4. Third embodiment (example in which a prism-type PBS is used as a polarization separation element) 5. Variations 5-1. Modification 3 (Example of integrating a color separation element and a prism-type PBS) 5-2. Modification 4 (combination of the second and third embodiments) 5-3. Modification 5 (combination of the second embodiment and modification 4) 5-4. Modification 6 (Example of combining a polarization separation element and a color separation element with an angle adjustment mechanism) 5-5. Modification 7 (Example using a transmissive wavelength conversion unit) 6. Application Examples

[0012] <1. First embodiment> 1 illustrates an example of the configuration of a light source device (light source device 1) according to a first embodiment of the present disclosure. The light source device 1 is used, for example, as illumination for a projection display device (projection display device 6, see FIG. 14) described below.

[0013] (1-1. Configuration of the Light Source Device) The light source device 1 includes, for example, a light source section 11, a wavelength conversion section 12, a polarization separation element 13, and a color separation element 14. In this embodiment, the polarization separation element 13 is disposed between the light source section 11 and the wavelength conversion section 12, and the color separation element 14 is disposed between the light source section 11 and the polarization separation element 13. The light source device 1 further includes a light source section 15 and a condensing optical system 16. The light source section 15 is disposed, for example, opposite the light source section 11 with the polarization separation element 13 and the color separation element 14 therebetween, and the condensing optical system 16 is disposed between the wavelength conversion section 12 and the polarization separation element 13.

[0014] The light source unit 11 has one or more light sources 111 and lenses 112 arranged to face each light source 111. The light source 111 is a solid-state light source that emits light in a predetermined wavelength range, and is intended to excite phosphor particles contained in a phosphor layer 122 of the wavelength conversion unit 12, which will be described later. For example, a semiconductor laser (Laser Diode: LD) can be used as the light source 111. Alternatively, a light emitting diode (Light Emitting Diode: LED) may be used.

[0015] The light source unit 11 emits, as the excitation light EL, light in a wavelength band corresponding to blue, for example, with a wavelength of 400 nm to 470 nm (blue light) or light in an ultraviolet region, for example, with a wavelength of 350 nm to 400 nm (ultraviolet: UV light). When an ultraviolet laser emitting UV light is used as the light source 111, it is possible to improve the luminous efficiency and conversion efficiency compared to the case of using a blue laser. This makes it possible to improve the ratio of the power of the fluorescence FL that can be finally used to the power supplied to the light source unit 11. This light source unit 11 corresponds to a specific example of the "first light source unit" of the present disclosure, and the blue light or UV light corresponds to a specific example of the "light in a first wavelength region" of the present disclosure. In this specification, the light in a predetermined wavelength region refers to light having a luminous intensity peak in that wavelength region.

[0016] The wavelength conversion section 12 converts the light (excitation light EL) emitted from the light source section 11 into light (fluorescence light FL) in a different wavelength range and emits the light, and corresponds to a specific example of a "wavelength conversion section" in the present disclosure. The wavelength conversion section 12 is, for example, a so-called reflective type in which a phosphor layer 122 is provided on a support substrate 121 having light reflectivity, and is configured to reflect and emit the fluorescence FL generated by the incidence of the excitation light EL.

[0017] The support substrate 121 is for supporting the phosphor layer 122 and has, for example, a disk shape. The support substrate 121 is preferably a reflective member and also functions as a heat dissipation member. For this reason, the support substrate 121 is preferably made of a metal material with high thermal conductivity. In addition, it is preferable to use a metal material or a ceramic material that can be mirror-finished. This can suppress a temperature rise in the phosphor layer 122 and improve the extraction efficiency of the light (fluorescence FL) in the wavelength conversion section 12.

[0018] Examples of such metal materials include aluminum (Al), copper (Cu), molybdenum (Mo), tungsten (W), cobalt (Co), chromium (Cr), platinum (Pt), tantalum (Ta), lithium (Li), zirconium (Zr), ruthenium (Ru), rhodium (Rh), palladium (Pd), and other single metals, or alloys containing one or more of these. Examples of ceramic materials include silicon carbide (SiC), aluminum nitride (AlN), beryllium oxide (BeO), a composite material of Si and SiC, or a composite material of SiC and Al (wherein the SiC content is 50% or more).

[0019] The phosphor layer 122 includes a plurality of phosphor particles, and is excited by the excitation light EL to emit light (fluorescence FL) in a wavelength range different from the wavelength range of the excitation light EL. The phosphor layer 122 is formed, for example, in a plate shape, and is made of, for example, a so-called ceramic phosphor or a binder-type phosphor. The phosphor layer 122 includes phosphor particles that are excited by, for example, blue light (excitation light EL) emitted from the light source unit 11 to emit light (fluorescence FL) in a wavelength range corresponding to yellow. This yellow light corresponds to a specific example of the "light in the second wavelength range" of the present disclosure. Examples of such phosphor particles include YAG (yttrium aluminum garnet)-based materials. The phosphor layer 122 may further include semiconductor nanoparticles such as quantum dots, organic dyes, and the like.

[0020] The wavelength conversion section 12 may be provided with a cooling mechanism (not shown).

[0021] As shown in FIG. 2A and FIG. 2B, the wavelength conversion unit 12 may be a so-called phosphor wheel 12A that can rotate around a rotation axis (for example, axis J123). In the phosphor wheel 12A, a motor 123 (drive unit) is connected to the center (O) of the support substrate 121, and the support substrate 121 can rotate around the axis J123, for example, in the direction of the arrow C, by the driving force of the motor 123. In the phosphor wheel 12A, the phosphor layer 122 is formed, for example, continuously, in the circumferential direction of the rotation of the support substrate 121. In the phosphor wheel 12A, the support substrate 121 rotates, so that the irradiation position of the excitation light EL on the phosphor layer 122 changes (moves) over time at a speed corresponding to the number of rotations. This makes it possible to avoid a decrease in conversion efficiency and deterioration of phosphor particles caused by the excitation light EL being irradiated to the same position of the phosphor layer 122 for a long time.

[0022] The polarization separation element 13 includes, for example, a polarizing beam splitter (PBS) and separates the incident light based on the polarization component, and is configured to, for example, reflect the S-polarized component and transmit the P-polarized component. Specifically, the polarization separation element 13 is disposed between the light source unit 11 and the wavelength conversion unit 12, and reflects the excitation light EL incident from the light source unit 11 and guides it to the wavelength conversion unit 12, and also reflects a part of the fluorescence FL incident from the wavelength conversion unit 12 and guides it to the color separation element 14 described later, and the rest to the illumination optical system (for example, the illumination optical system 300, see FIG. 15) described later. In addition, the assist light AL emitted from the light source unit 15 described later is incident on the polarization separation element 13. The assist light AL is reflected by the polarization separation element 13 and guided to the illumination optical system 300 together with the remaining fluorescence FL transmitted through the polarization separation element 13. That is, the polarization separation element 13 also functions as a color synthesis element (light path synthesis element).

[0023] The polarization separation element 13 can be configured, for example, by a so-called plate-type polarization beam splitter in which an optically functional film that reflects or transmits incident light for each polarization component is formed, for example, by deposition, on one or both of a pair of opposing surfaces of a glass plate. In this embodiment, for example, an optically functional film (PBS film) is formed on surface 13S1 of the pair of opposing surfaces (surfaces 13S1 and 13S2).

[0024] The color separation element 14 includes, for example, a dichroic mirror, and separates the incident light based on the wavelength range. The color separation element 14 is disposed between the light source unit 11 and the polarization separation element 13, and is configured to transmit the excitation light EL emitted from the light source unit 11 and to reflect a part of the fluorescence FL that is incident from the wavelength conversion unit 12 and reflected by the polarization separation element 13.

[0025] The light source unit 15 has one or more light sources 151 and lenses 152 arranged opposite to each light source 151. The light source 151 is an auxiliary light source for adjusting the balance of RGB to display a wider color gamut in the projection display device 6, and is arranged opposite to the light source unit 11, for example, with the polarization separation element 13 and the color separation element 14 in between. As the light source 151, for example, a semiconductor laser (LD) can be used, as in the light source unit 11. By using a semiconductor laser, it is possible to reduce the etendue. Alternatively, a light emitting diode (LED) may be used. When a light emitting diode is used, it is possible to reduce speckles. In addition, compared to the case of using a semiconductor laser, it is advantageous in terms of laser safety.

[0026] The light source unit 15 is preferably configured to include a plurality of types of light sources that emit light in different wavelength ranges, for example, a light source 151R that emits light in a wavelength range corresponding to red (red light R), a light source 151G that emits light in a wavelength range corresponding to green (green light G), and a light source 151B that emits light in a wavelength range corresponding to blue (blue light H). This makes it possible to expand the color range of the light emitted to the illumination optical system 300. In addition, the light source unit 15 may use light sources that emit the same color light and have shifted emission wavelengths from each other. This makes it possible to reduce speckles. This light source unit 15 corresponds to a specific example of the "second light source unit" of the present disclosure, and the red light, green light, and blue light emitted from the light source unit 15 correspond to a specific example of the "light in a third wavelength range" of the present disclosure.

[0027] The light collecting optical system 16 is composed of one or more lenses, including, for example, a collimating lens. The light collecting optical system 16 is disposed between the wavelength conversion unit 12 and the polarization separation element 13, and collects the excitation light EL to a predetermined spot diameter and directs it to the phosphor layer 122, and converts the fluorescence FL emitted from the wavelength conversion unit 12 into parallel light and directs it to the polarization separation element 13.

[0028] (1-2. Operating principle of light source device) In the light source device 1, the light source section 11 and the light source section 15 are disposed facing each other along one direction (for example, the Y-axis direction). Between the light source section 11 and the light source section 15, the opposing surfaces 13S1 and 13S2 of the polarization separation element 13 are disposed at an angle of, for example, approximately 45° with respect to the Y-axis direction, so that the excitation light EL emitted from the light source section 11 is incident on the surface 13S1, and the light emitted from the light source section 15 (for example, red light R, green light G, and blue light B) is incident on the surface 13S2. Between the light source section 11 and the polarization separation element 13, a color separation element 14 is further disposed. The wavelength conversion section 12 is disposed facing the surface 13S1 of the polarization separation element 13 along another direction (for example, the X-axis direction) perpendicular to the one direction, and a light collecting optical system 16 is disposed between the wavelength conversion section 12 and the polarization separation element 13.

[0029] In this embodiment, the light source unit 11 emits, for example, blue light Bs (excitation light EL) mainly composed of S-polarized light. The blue light Bs (excitation light EL) emitted from the light source unit 11 first passes through the color separation element 14 and is reflected toward the light collecting optical system 16 at the surface 13S1 of the polarization separation element 13. The blue light Bs incident on the light collecting optical system 16 is collected to a predetermined spot diameter and emitted toward the wavelength conversion unit 12. The blue light Bs incident on the wavelength conversion unit 12 excites phosphor particles in the phosphor layer 122. In the phosphor layer 122, the phosphor particles are excited by irradiation with the blue light Bs and emit fluorescence FL. This fluorescence FL is yellow light Ys, Yp containing S-polarized components and P-polarized components, and is emitted toward the light collecting optical system 16. The yellow light Ys, Yp incident on the light collecting optical system 16 is converted into parallel light and emitted toward the polarization separation element 13. Of the yellow light beams Ys and Yp incident on the polarization separation element 13, the S-polarized yellow light beam Ys is reflected by the surface 13S1 of the polarization separation element 13 towards the color separation element 14, while the P-polarized yellow light beam Yp is transmitted through the polarization separation element 13.

[0030] Red light Rs, green light Gs, and blue light Bs, which are mainly S-polarized light, are emitted as assist light AL from the light source unit 15. The red light Rs, green light Gs, and blue light Bs are incident on a surface 13S2 of the polarization separation element 13 and are reflected on a surface 13S1. The yellow light Yp transmitted through the polarization separation element 13 is combined with the red light Rs, green light Gs, and blue light Bs and is emitted toward the illumination optical system 300.

[0031] The yellow light Ys that is reflected by surface 13S1 of the polarization separation element 13 and enters the color separation element 14 is reflected toward surface 13S1 of the polarization separation element 13, passes through the polarization separation element 13 and the condensing optical system 16, and enters the wavelength conversion unit 12 again. Of the yellow light Ys that enters the wavelength conversion unit 12, light in the absorption wavelength range of the phosphor particles is reused for exciting the phosphor particles, and light in other wavelength ranges is scattered by the phosphor layer 122, and a part of the polarized light is converted and output toward the condensing optical system 16. By repeating this, it is possible to guide the S-polarized fluorescence FL to the illumination optical system 300 without discarding it.

[0032] (1-3. Actions and Effects) In the light source device 1 of the present embodiment, a polarization separation element 13 that separates the incident light based on its polarization components is provided between the light source section 11 and the wavelength conversion section 12, and a color separation element 14 that separates the incident light based on its wavelength range is provided between the polarization separation element 13 and the light source section 11. This makes it possible to use one of the polarization components of the fluorescence FL emitted from the wavelength conversion section 12 as illumination for the projection display device 6, for example, without discarding it. This will be described below.

[0033] The light source for projectors is changing from the conventional discharge tube type to laser-excited phosphor light sources. The main reason for this is that the lifespan of phosphor light sources is extremely long, about 10 times longer than that of discharge tube type light sources. Most of the currently mainstream phosphor light sources use YAG (yttrium aluminum garnet) phosphors. Projectors that use this YAG phosphor as the phosphor light source split the yellow emission color in the continuous wavelength band from green to red into green and red for use.

[0034] However, in the wavelength spectrum of YAG, when effectively utilizing the emission wavelength, the limit is to achieve a white balance near D65 in the sRGB color gamut, and when displaying a wider color gamut than that, it is necessary to narrow the wavelength range of each primary color and increase the primary color quality. In that case, the unnecessary light is discarded. Furthermore, when changing the RGB balance to display the white point, the green wavelength of the light emitted from the phosphor light source using the YAG phosphor is discarded. This causes the problem that sufficient brightness cannot be obtained.

[0035] One possible means for solving the above problem is to combine the auxiliary light of each primary color (e.g., R, G, B laser) with the fluorescent light emitted from the phosphor light source. In the above-mentioned light source device, high utilization efficiency (low etendue) is achieved by collecting and combining the fluorescent light and the light from the blue solid-state light source and the red solid-state light source in the same optical system, but one of the polarized components of the fluorescent light combined in the laser wavelength range is discarded. Also, the above-mentioned light source device is configured in such a way that it is theoretically not possible to combine green.

[0036] In contrast, in the present embodiment, a polarization separation element 13 that separates incident light based on its polarization components is provided between the light source unit 11 and the wavelength conversion unit 12, and a color separation element 14 that separates incident light based on its wavelength range is provided between the polarization separation element 13 and the light source unit 11. As a result, of the fluorescence FL emitted from the wavelength conversion unit 12, one polarization component (for example, S-polarized light (yellow light Ys)) is reflected toward the color separation element 14, and the other polarization component (for example, P-polarized light (yellow light Yp)) is transmitted through the polarization separation element 13 and guided to the illumination optical system 300. The S-polarized fluorescence FL (yellow light Ys) that is incident on the color separation element 14 is reflected toward the polarization separation element 13 and enters the wavelength conversion unit 12 via the polarization separation element 13 and the condensing optical system 16. Of the fluorescence FL (yellow light Ys) incident on the wavelength conversion unit 12, light in the absorption wavelength range of the phosphor particles is reused for exciting the phosphor particles, and light in other wavelength ranges is scattered by the phosphor layer 122, and a part of the polarized light is converted and emitted toward the focusing optical system 16. This makes it possible to use one of the polarized components (for example, the S-polarized component (yellow light Ys)) contained in the fluorescence FL emitted from the wavelength conversion unit 12 as illumination in the projection display device 6, for example, without being discarded.

[0037] As a result, in the light source device 1 of the present embodiment, it is possible to extract the fluorescence FL as illumination light for the projection display device 6 without discarding a portion of the fluorescence FL. In other words, it is therefore possible to improve the efficiency of extracting light with aligned polarization. It is also possible to improve the efficiency of combining the red (R), green (G), and blue (B) laser light emitted from the auxiliary light source (light source unit 15).

[0038] Furthermore, in this embodiment, as described above, the fluorescence FL can be combined without being discarded in part, and therefore the light intensity can be increased.

[0039] Furthermore, in this embodiment, the auxiliary light source (light source section 15) is arranged to face the surface 13S2 of the polarization separation element 13. This makes it possible to combine the fluorescence FL emitted from the wavelength conversion section 12 and the red (R), green (G) and blue (B) laser light emitted from the light source section 15 on the same optical axis. This makes it possible to prevent the etendue from deteriorating. In addition, it also becomes possible to reduce the size of the light source device 1.

[0040] Furthermore, in the light source device 1 of this embodiment, manufacturability and robustness against the use environment can be improved. For example, the dichroic mirror constituting the color separation element 14 has a cutoff wavelength variation of several nm due to manufacturing variations and the like. In addition, the wavelength of the semiconductor laser varies depending on the environmental temperature. For this reason, in a light source device that combines fluorescent light and assist light using a dichroic mirror, as in the above-mentioned light source device, there is a problem that manufacturing variations and environmental variations are large due to variations in the cutoff wavelength of the dichroic mirror and variations in the wavelength of the laser light. In contrast, the configuration of the light source device 1 of this embodiment is not affected by manufacturing variations in the dichroic mirror and variations in the wavelength of the laser light. As a result, it is possible to reduce manufacturing costs because strict control of the specification accuracy of the components and the operating temperature of the laser is not required.

[0041] Next, the second and third embodiments and modifications 1 to 7 of the present disclosure and application examples will be described. In the following, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted as appropriate.

[0042] <2. Modifications> (2-1. Variation 1) 3 shows a configuration example of a light source device 1A according to Modification 1 of the present disclosure. In the above-described first embodiment, the light source section 11, the color separation element 14, the polarization separation element 13, and the light source section 15 are arranged in this order along one direction (for example, the Y-axis direction), and the wavelength conversion section 12 is arranged in another direction (for example, the X-axis direction) perpendicular to the one direction with respect to the polarization separation element 13, but the present invention is not limited to this.

[0043] For example, the optical components constituting the light source device 1A may be arranged such that the light source unit 11 and the wavelength conversion unit 12 are arranged in opposite directions at the same angle with respect to the normal to a pair of opposing surfaces (surfaces 13S1 and 13S2) of the polarization separation element 13, and the color separation element 14 is arranged perpendicular to the direction of travel of light (fluorescence FL (yellow light Ys)) that is reflected by surface 13S1 of the polarization separation element 13 and heads toward the light source unit 11.

[0044] (2-2. Variation 2) 4 shows a configuration example of a light source device 1B according to Modification 2 of the present disclosure. In the above-described first embodiment, the light source section 11 and the light source section 15 are disposed opposite each other, and the wavelength conversion section 12 and the light collecting optical system 16 are disposed in a direction perpendicular to the arrangement direction of the light source section 11 and the light source section 15 (for example, the Y-axis direction), but the present invention is not limited to this.

[0045] For example, the polarization direction of the laser can be changed by rotating it 90° with respect to the optical axis. In that case, the configuration shown in FIG. 4 can be used. That is, the light source unit 11 and the wavelength conversion unit 12 are arranged to face each other along, for example, the X-axis direction, and the polarization separation element 13 is arranged between the light source unit 11 and the wavelength conversion unit 12 so that the opposing surfaces 13S1 and 13S2 form an angle of, for example, approximately 45° with respect to the X-axis direction, the color separation element 14 is arranged between the light source unit 11 and the polarization separation element 13, and the light collecting optical system 16 is arranged between the wavelength conversion unit 12 and the polarization separation element 13. The light source unit 15 is arranged to face the surface 13S2 of the polarization separation element 13 along, for example, the Y-axis direction perpendicular to the X-axis direction. As a result, the light source device 1B of this modified example can obtain the same effect as that of the first embodiment.

[0046] The configuration of this modified example can also be realized by disposing a ½λ plate between the light source unit 11 and the polarization separation element 13, and between the light source unit 15 and the polarization separation element 13, respectively.

[0047] <3. Second embodiment> 5 shows a configuration example of a light source device (light source device 2) according to a second embodiment of the present disclosure. Like the above-mentioned light source device 1, the light source device 2 is used, for example, as illumination for a projection-type display device (projection-type display device 6) described below. The light source device 2 of this embodiment differs from the above-mentioned first embodiment in that a polarization conversion element 17 is provided between the wavelength conversion section 12 and the polarization separation element 13.

[0048] The polarization conversion element 17 scrambles the polarization state of incident light and emits it. Specifically, the polarization conversion element 17 scrambles the polarization state of the S-polarized fluorescence FL (yellow light Ys) reflected by the color separation element 14 and reflected toward the wavelength conversion section 12 at the surface 13S1 of the polarization separation element 13, and converts a part of it into P-polarized light, thereby allowing the fluorescence FL to be efficiently transmitted through the polarization separation element 13. The polarization conversion element 17 is disposed, for example, between the polarization separation element 13 and the condensing optical system 16.

[0049] As the polarization conversion element 17, for example, a depolarizing element such as a quartz plate or a depolarizing film can be used. In addition, as the polarization conversion element 17, for example, a 1 / 4λ plate or a retardation plate that generates a phase difference of 1 / 4λ+α can be used. For example, when a 1 / 4λ plate is used as the polarization conversion element 17, the S-polarized fluorescence FL (yellow light Ys) reflected on the surface 13S1 of the polarization separation element 13 is converted into circularly polarized light and emitted toward the wavelength conversion unit 12, and is converted into linearly polarized light when reflected by the wavelength conversion unit 12 and passes through the 1 / 4λ plate again. Of these, the P-polarized fluorescence FL (yellow light Yp) is transmitted through the polarization separation element 13 and guided to the illumination optical system 300.

[0050] As described above, in this embodiment, the polarization conversion element 17 is provided between the wavelength conversion unit 12 and the polarization separation element 13, specifically, between the polarization separation element 13 and the light collecting optical system 16, so that the fluorescence FL can be efficiently transmitted through the polarization separation element 13. This makes it possible to efficiently multiplex the fluorescence FL with the assist light AL, and further improve the efficiency of extracting light with aligned polarization.

[0051] <4. Third embodiment> 6 shows a configuration example of a light source device (light source device 3) according to a third embodiment of the present disclosure. Like the above-mentioned light source device 1, the light source device 3 is used, for example, as illumination for a projection-type display device (projection-type display device 6) described below. The light source device 3 of this embodiment differs from the above-mentioned first embodiment in that a prism-type polarizing beam splitter is used as the polarization separation element 23.

[0052] The polarization separation element 23 can be configured with an optical function film that reflects or transmits incident light for each polarization component, and a prism bonded to sandwich this optical function film.

[0053] In this way, in the light source device 3 of the present embodiment, a prism-type polarizing beam splitter is used as the polarization separation element 23, so that the incident surface of the polarization separation element 23 can be easily arranged perpendicular to, for example, the optical axes of the excitation light EL and assist light AL emitted from the light source unit 11 and the light source unit 15, respectively, and the fluorescence FL emitted from the wavelength conversion unit 12.

[0054] Furthermore, in the light source device 3 of this embodiment, a prism-type polarizing beam splitter is used as the polarization separation element 23, so that it is possible to reduce deterioration such as warping of the substrate, compared to the case where a plate-type polarizing beam splitter is used.

[0055] <5. Modifications> (5-1. Variation 3) Fig. 7 shows a configuration example of a light source device 3A according to Modification 3 of the present disclosure. The prism-type polarization separation element 23 and the color separation element 14 may be integrated as shown in Fig. 7. The prism-type polarization separation element 23 and the color separation element 14 can be integrally formed, for example, by evaporating an optically functional film that transmits or reflects light of a predetermined wavelength range of incident light on the surface of the prism constituting the polarization separation element 23 that faces the light source unit 11.

[0056] In this way, in the light source device 3A of this modification, the polarization separation element 23 and the color separation element 14 are integrated, so that it is possible to reduce the number of parts, and therefore it is possible to reduce the manufacturing cost and the manufacturing process.

[0057] (5-2. Variation 4) 8 shows a configuration example of a light source device 3B according to the fourth modification of the present disclosure. The light source device 3B of this modification is a combination of the second and third embodiments. In this manner, a prism-type polarization separation element 23 may be provided between the light source unit 11 and the light source unit 15, and a polarization conversion element 17 may be provided between the wavelength conversion unit 12 and the polarization separation element 23.

[0058] This further improves the efficiency of extracting polarized light, and makes it possible to easily position the incident surface of the polarization separation element 23 perpendicular to the optical axes of the excitation light EL and assist light AL emitted from the light source unit 11 and the light source unit 15, respectively, and the fluorescence FL emitted from the wavelength conversion unit 12.

[0059] (5-3. Variation 5) 9 illustrates a configuration example of a light source device 3C according to Modification 5 of the present disclosure. The light source device 3C of this modification is a combination of the second embodiment and Modification 3. In this manner, the polarization conversion element 17 may be disposed between the wavelength conversion section 12 and the polarization separation element 23 integrated with the color separation element 14.

[0060] This makes it possible to reduce manufacturing costs in addition to the effects of the fourth modification. Also, it becomes possible to reduce the number of manufacturing steps.

[0061] (5-4. Variation 6) Fig. 10 shows a configuration example of a light source device 4 according to Modification 6 of the present disclosure. The light source device 4 of this modification is different from the above-described first embodiment in that the angles of the polarization separation element 13 and the color separation element 14 are adjustable. The angles of the polarization separation element 13 and the color separation element 14 can be adjusted using, for example, angle adjustment mechanisms 140, 240 shown in Figs. 11 and 12. These angle adjustment mechanisms 140, 240 correspond to specific examples of the "first angle adjustment mechanism" and "second angle adjustment mechanism" of the present disclosure.

[0062] The angle adjustment mechanism 140 includes, for example, two rectangular frame bodies 141, 142 and, for example, four angle adjustment screws 143 that connect the two frame bodies 141, 142. The two frame bodies 141, 142 are connected to each other, for example, at four corners, by the four angle adjustment screws 143. One of the two frame bodies 141, 142 (for example, the frame body 141) is held by a holder not shown, and the polarization separation element 13 or the color separation element 14 is attached to the other frame body (for example, the frame body 142). In the angle adjustment mechanism 140, for example, by fixing one of the four angle adjustment screws and loosening the remaining ones, the frame body 142 can be moved, for example, in the Y-axis direction with the fixed angle adjustment screw 143 as a fulcrum. This makes it possible to adjust the angle of the polarization separation element 13 or the color separation element 14 attached to the frame body 142.

[0063] The angle adjustment mechanism 240 includes, for example, two rectangular frame bodies 241 and 242 and two rotation shafts 243 and 244. The two frame bodies 241 and 242 have different external shapes, and for example, the frame body 241 is arranged in a nested manner within the frame body 242. The polarization separation element 13 or the color separation element 14 is attached to the inner frame body 241. The frame body 241 and the frame body 242 are connected to each other by the rotation shaft 243 at the center parts of two opposing sides. The frame body 242 is connected to a holder (not shown) via the rotation shaft 244 at the center parts of two opposing sides different from the two sides connected to each other by the rotation shaft 243. The frame body 241 can be rotated, for example, around the Z-axis direction as the rotation axis, and the frame body 242 can be rotated, for example, around the X-axis direction as the rotation axis. This makes it possible to adjust the angle of the polarization separation element 13 or the color separation element 14 attached to the frame body 241.

[0064] In this way, in the light source device 4 of this modified example, the angles of the polarization separation element 13 and the color separation element 14 can be adjusted, so that, for example, it is possible to adjust the focusing position on the phosphor layer 122 of the fluorescence FL (yellow light Ys) that is reflected by the polarization separation element 13 and re-enters the wavelength conversion section 12.

[0065] As a result, for example, when the position of the fluorescence FL (yellow light Ys) focused on the phosphor layer 122 overlaps with the focusing position of the excitation light EL, it is possible to suppress the spread of the light emitting point. Therefore, it is possible to suppress an increase in etendue and improve the light utilization efficiency in the optical system (e.g., the illumination optical system 300) constituting the projection display device 6.

[0066] Furthermore, for example, when the position of the fluorescence FL (yellow light Ys) focused on the phosphor layer 122 is shifted from the focusing position of the excitation light EL, it is possible to suppress the temperature rise and brightness saturation of the phosphor layer 122 and improve the conversion efficiency.

[0067] (5-5. Variation 7) 13 illustrates a configuration example of a light source device 5 according to a seventh modification of the present disclosure. The light source device 5 of this modification is different from the first embodiment in that it is configured using a transmissive wavelength conversion unit 22.

[0068] In the light source device 5 of this modification, the light source section 11, the wavelength conversion section 22, and the polarization separation element 13 are arranged in this order along one direction (for example, the X-axis direction). The polarization separation element 13 is arranged such that the opposing surfaces 13S1 and 13S2 are arranged at an angle of, for example, approximately 45° with respect to the X-axis direction. The color separation element 14 is arranged to face the surface 13S1 of the polarization separation element 13 in another direction (for example, the Y-axis direction) perpendicular to the one direction. The light source section 15 is arranged to face the surface 13S2 of the polarization separation element 13 along the other direction (for example, the Y-axis direction) perpendicular to the one direction. A condensing optical system 16 is arranged between the wavelength conversion section 12 and the polarization separation element 13.

[0069] The wavelength conversion unit 22 converts the light (excitation light EL) emitted from the light source unit 11 into light (fluorescence FL) having a different wavelength range and emits the light, and corresponds to a specific example of a "wavelength conversion unit" in the present disclosure. The wavelength conversion unit 22 has, for example, a phosphor layer 122 provided on a light-transmitting support substrate 221, and a color separation element 18 provided on the surface of the support substrate 221 opposite to the surface on which the phosphor layer 122 is formed, for example, on the surface facing the light source unit 11. Furthermore, a lens 19 that focuses the excitation light EL onto the phosphor layer 122 is disposed between the light source unit 11 and, for example, the color separation element 18.

[0070] The color separation element 18, like the color separation element 14 in the first embodiment, is configured to include, for example, a dichroic mirror and separates the incident light based on the wavelength range. Specifically, the color separation element 18 is configured to transmit the excitation light EL and reflect the fluorescence FL.

[0071] Although FIG. 13 shows an example in which the color separation element 18 is integrally formed with the support substrate 221, the color separation element 18 may be disposed separately from the wavelength conversion section 22.

[0072] In this way, the light source device 5 of this modified example using the transmissive wavelength conversion section 22 can also obtain the same effects as those of the first embodiment.

[0073] <6. Application Examples> (Application example 1) 14 is a functional block diagram showing the overall configuration of a projection display device (projection display device 6) according to Application Example 1. This projection display device 6 is a display device that projects an image onto, for example, a screen 68 (projection surface). The projection display device 6 is connected to, for example, an external image supply device such as a computer such as a PC (not shown) or various image players via an I / F (interface), and projects an image onto the screen 68 based on an image signal input to this interface.

[0074] The projection type display device 6 includes, for example, a light source driving unit 61, a light source device 1, a light modulation device 62, a projection optical system 63, an image processing unit 64, a frame memory 65, a panel driving unit 66, a projection optical system driving unit 67, and a control unit 60.

[0075] The light source driving unit 61 outputs a signal for controlling the light emission timing of the light sources (light source 111 and light source 151) arranged in the light source device 1. The light source driving unit 61 includes, for example, a PWM setting unit, a PWM signal generating unit, and a limiter, which are not shown, and controls the light source driver of the light source device 1 under the control of the control unit 60, and controls the light source 111 and the light source 151 with PWM control, thereby turning the light source 111 and the light source 151 on and off or adjusting the brightness.

[0076] Although not shown in particular, in addition to the components described in the first embodiment, the light source device 1 includes, for example, a light source driver that drives the light source 111 and the light source 151, and a current value setting unit that sets the current values ​​when driving the light source 111 and the light source 151. The light source driver generates a current having a current value set by the current value setting unit based on a power supply supplied from a power supply circuit (not shown) in synchronization with a signal input from the light source driving unit 61. The generated current is supplied to the light source 111 and the light source 151, respectively.

[0077] The light modulation device 62 generates image light by modulating the light (illumination light) output from the light source device 1 based on an image signal. The light modulation device 62 includes, for example, three transmissive or reflective light valves corresponding to the respective colors of RGB described later. For example, a liquid crystal panel that modulates blue light (B), a liquid crystal panel that modulates red light (R), and a liquid crystal panel that modulates green light (G) can be used. As the reflective liquid crystal panel, for example, a liquid crystal element such as LCOS (Liquid Crystal On Silicon) can be used. However, the light modulation device 62 is not limited to a liquid crystal element, and other light modulation elements such as DMD (Digital Micromirror Device) may be used. The RGB color lights modulated by the light modulation device 62 are combined by a cross dichroic prism (not shown) or the like, and are guided to the projection optical system 63.

[0078] The projection optical system 63 includes a group of lenses and the like for projecting the light modulated by the light modulation device 62 onto a screen 68 to form an image.

[0079] The image processing unit 64 acquires an image signal input from the outside and performs the following operations: determining the image size, the resolution, and whether the image is a still image or a moving image. If the image is a moving image, the image data attributes such as the frame rate are also determined. If the resolution of the acquired image signal is different from the display resolution of each liquid crystal panel of the light modulation device 62, the image processing unit 64 performs a resolution conversion process. The image processing unit 64 loads the images after each of these processes in the frame memory 65 for each frame, and outputs the image for each frame loaded in the frame memory 65 to the panel driving unit 66 as a display signal.

[0080] The panel driver 66 drives each liquid crystal panel of the light modulation device 62. By driving the panel driver 66, the light transmittance of each pixel arranged on each liquid crystal panel changes, and an image is formed.

[0081] The projection optical system driving unit 67 includes a motor that drives a lens arranged in the projection optical system 63. This projection optical system driving unit 67 drives, for example, the projection optical system 63 under the control of the control unit 60, and performs, for example, zoom adjustment, focus adjustment, and aperture adjustment.

[0082] The control unit 60 controls a light source driving unit 61 , an image processing unit 64 , a panel driving unit 66 , and a projection optical system driving unit 67 .

[0083] In this projection display device 6, for example, by including the light source device 1 described above, it is possible to realize simplification and miniaturization of the entire device.

[0084] (Configuration example 1 of a projection type display device) 15 is a schematic diagram showing an example (projection display device 6A) of the overall configuration of an optical system that constitutes the projection display device 6. The projection display device 6A is a reflective 3LCD projection display device that performs light modulation using a reflective liquid crystal panel (LCD).

[0085] As shown in FIG. 15, the projection display device 6A includes a light source device 1, an illumination optical system 300, an image forming section 400, and a projection optical system 500, in that order.

[0086] The illumination optical system 300 has, for example, from a position close to the light source device 1, a fly-eye lens 310 (310A, 310B), a polarization conversion element 320, a lens 330, dichroic mirrors 340A, 340B, reflecting mirrors 350A, 350B, lenses 360A, 360B, a dichroic mirror 370, and polarizing plates 380A to 380C.

[0087] The fly-eye lens 310 (310A, 310B) homogenizes the illuminance distribution of the illumination light from the light source device 1. The polarization conversion element 320 functions to align the polarization axis of the incident light in a predetermined direction. For example, it converts randomly polarized light into P-polarized light. The lens 330 focuses the light from the polarization conversion element 320 toward the dichroic mirrors 340A, 340B. The dichroic mirrors 340A, 340B selectively reflect light in a predetermined wavelength range and selectively transmit light in other wavelength ranges. For example, the dichroic mirror 340A mainly reflects red light Lr and green light Lg toward the reflecting mirror 350A. The dichroic mirror 340B mainly reflects blue light Lb toward the reflecting mirror 350B. The reflecting mirror 350A reflects the light (mainly red light Lr and green light Lg) from the dichroic mirror 340A toward the lens 360A, and the reflecting mirror 350B reflects the light (mainly blue light Lb) from the dichroic mirror 340B toward the lens 360B. The lens 360A transmits the light (mainly red light Lr and green light Lg) from the reflecting mirror 350A and focuses it on the dichroic mirror 370. The dichroic mirror 370 selectively reflects the green light Lg toward the polarizing plate 380C and selectively transmits light in other wavelength ranges. The polarizing plates 380A to 380C include polarizers having a polarization axis in a predetermined direction. For example, when the light is converted to P-polarized light by the polarization conversion element 320, the polarizing plates 380A to 380C transmit the P-polarized light and reflect the S-polarized light.

[0088] The image forming section 400 includes reflective polarizing plates 410A to 410C, reflective liquid crystal panels 420A to 420C (light modulation elements), and a dichroic prism 430.

[0089] The reflective polarizing plates 410A to 410C transmit light having the same polarization axis as the polarization axis of the polarized light from the polarizing plates 380A to 380C (for example, P-polarized light) and reflect light having the other polarization axis (S-polarized light). Specifically, the reflective polarizing plate 410A transmits the P-polarized red light Lr from the polarizing plate 380A toward the reflective liquid crystal panel 420A. The reflective polarizing plate 410B transmits the P-polarized blue light Lb from the polarizing plate 380B toward the reflective liquid crystal panel 420B. The reflective polarizing plate 410C transmits the P-polarized green light Lg from the polarizing plate 380C toward the reflective liquid crystal panel 420C. The reflective polarizing plate 410A also reflects the S-polarized red light Lr from the reflective liquid crystal panel 420A and makes it enter the dichroic prism 430. Reflective polarizing plate 410B reflects S-polarized blue light Lb from reflective liquid crystal panel 420B and causes it to enter dichroic prism 430. Reflective polarizing plate 410C reflects S-polarized green light Lg from reflective liquid crystal panel 420C and causes it to enter dichroic prism 430.

[0090] The reflective liquid crystal panels 420A to 420C perform spatial modulation of red light Lr, blue light Lb, or green light Lg, respectively.

[0091] The dichroic prism 430 combines the incident red light Lr, blue light Lb, and green light Lg, and emits the combined light toward the projection optical system 500.

[0092] The projection optical system 500 includes, for example, a plurality of lenses, etc. The projection optical system 500 magnifies the light emitted from the image forming unit 400 and projects it onto a screen 600 or the like.

[0093] (Configuration Example 2 of Projection Type Display Device) 16 is a schematic diagram showing another example (projection display device 6B) of the overall configuration of the optical system that constitutes the projection display device 6. The projection display device 6B is a transmissive 3LCD type projection display device that performs light modulation using a transmissive liquid crystal panel (LCD).

[0094] The projection display device 6B includes, for example, a light source device 1, an image generating system 700 having an illumination optical system 710 and an image generating section 730, and a projection optical system 500, in that order.

[0095] The illumination optical system 710 has, for example, an integrator element 711, a polarization conversion element 712, and a condenser lens 713. The integrator element 711 includes a first fly's eye lens 711A having a plurality of microlenses arranged two-dimensionally, and a second fly's eye lens 711B having a plurality of microlenses arranged so as to correspond one by one to each of the microlenses.

[0096] Light (parallel light) incident on the integrator element 711 from the light source device 1 is split into multiple light beams by the microlenses of the first fly's eye lens 711A, and each beam is imaged on a corresponding microlens in the second fly's eye lens 711B. Each of the microlenses of the second fly's eye lens 711B functions as a secondary light source, and irradiates multiple parallel light beams with uniform brightness as incident light onto the polarization conversion element 712.

[0097] The integrator element 711 as a whole has a function of adjusting the incident light irradiated from the light source device 1 to the polarization conversion element 712 into a uniform luminance distribution.

[0098] The polarization conversion element 712 has a function of aligning the polarization state of the incident light that is incident via the integrator element 711 etc. This polarization conversion element 712 outputs output light including blue light Lb, green light Lg and red light Lr via, for example, a lens etc. arranged on the output side of the light source device 1.

[0099] The illumination optical system 710 further includes dichroic mirrors 714 and 715, mirrors 716, mirrors 717 and 718, relay lenses 719 and 720, field lenses 721R, field lenses 721G and 721B, liquid crystal panels 731R, 731G, and 731B as image generation section 730, and a dichroic prism 732.

[0100] The dichroic mirror 714 and the dichroic mirror 715 have the property of selectively reflecting color light in a predetermined wavelength range and transmitting light in other wavelength ranges. For example, the dichroic mirror 714 selectively reflects red light Lr. The dichroic mirror 715 selectively reflects green light Lg out of the green light Lg and blue light Lb transmitted through the dichroic mirror 714. The remaining blue light Lb transmits through the dichroic mirror 715. This separates the light emitted from the light source device 1 (for example, the white combined light Lw) into a plurality of color lights of different colors.

[0101] The separated red light Lr is reflected by mirror 716, and is collimated by passing through field lens 721R, and then enters liquid crystal panel 731R for modulating red light. The green light Lg is collimated by passing through field lens 721G, and then enters liquid crystal panel 731G for modulating green light. The blue light Lb passes through relay lens 719, is reflected by mirror 717, and further passes through relay lens 720, and is reflected by mirror 718. The blue light Lb reflected by mirror 718 is collimated by passing through field lens 721B, and then enters liquid crystal panel 731B for modulating blue light Lb.

[0102] The liquid crystal panels 731R, 731G, and 731B are electrically connected to a signal source (e.g., a PC, etc.) (not shown) that supplies an image signal including image information. The liquid crystal panels 731R, 731G, and 731B modulate the incident light for each pixel based on the supplied image signal for each color, and generate a red image, a green image, and a blue image, respectively. The modulated light for each color (the formed image) enters the dichroic prism 732 and is combined. The dichroic prism 732 overlaps and combines the light for each color incident from three directions, and outputs the combined light toward the projection optical system 500.

[0103] The projection optical system 500 includes, for example, a plurality of lenses etc. The projection optical system 500 magnifies the light emitted from the image generating system 700 and projects it onto the screen 600.

[0104] (Application example 2) Fig. 17 is a schematic diagram showing the configuration of a display system according to Application Example 2. Fig. 18 is a diagram showing the functional configuration of the display system according to Application Example 2. This display system includes a wristband-type terminal (wristband-type information processing device) 8 and a smartphone (external device) 7.

[0105] The smartphone 7 is, for example, an information processing device that operates in cooperation with the wristband type terminal 8, and has a function of transmitting an image to be projected or displayed to the wristband type terminal 8, and receiving information indicating a user operation. Specifically, the smartphone 7 transmits an image indicating a graphical user interface (GUI) to the wristband type terminal 8, and receives a user operation signal for the GUI. The smartphone 7 then performs processing according to the received user operation, and transmits an image indicating the GUI updated according to the processing to the wristband type terminal 8.

[0106] In addition, external devices that operate in conjunction with the wristband type terminal 8 are not limited to smartphones, but may be other information processing devices, such as digital still cameras, digital video cameras, PDAs (Personal Digital Assistants), PCs (Personal Computers), notebook PCs, tablet terminals, mobile phone terminals, portable music playback devices, portable video processing devices, or portable game devices.

[0107] The wristband type terminal 8 has, for example, a display unit 810 and a projection type display device 6 equipped with a light source device (for example, the light source device 1) of the above-mentioned embodiment, and is used by being worn on the user's wrist or the like by a band unit 8a. The band unit 8a is made of, for example, leather, metal, fiber, rubber, etc., similar to a wristwatch band.

[0108] 18, the wristband type terminal 8 further includes a control unit 820, a communication unit 830, an imaging unit 840, an operation unit 850, and a sensor unit 860. The wristband type terminal 8 is connected to the smartphone 7 by wireless communication and operates in cooperation with the smartphone 7. For example, an image received from the smartphone 7 in the pocket of the user's clothes can be displayed on the display unit 810 or projected onto the palm of the user's hand using the projection display device 6.

[0109] The display unit 810 displays images (still images or moving images) based on the control of the control unit 820, and is configured to include, for example, an LCD or an OLED (Organic Light-Emitting Diode), etc. This display unit 810 is configured, for example, integrally with the operation unit 850, and functions as a so-called touch panel.

[0110] The communication unit 830 transmits and receives signals (image signals, user operation signals, etc.) to and from the smartphone 7. Examples of communication methods include wireless, Bluetooth (registered trademark), WiHD (Wireless High Definition), WLAN (Wireless Local Area Network), Wi-Fi (Wireless Fidelity: registered trademark), NFC (Near Field communication), and infrared communication. In addition, communication may be performed using 3G / LTE (Long Term Evolution) or millimeter wave radio waves.

[0111] The imaging unit 840 has, for example, a lens unit including an imaging lens, an aperture, a zoom lens, and a focus lens, a drive unit that drives the lens unit to perform focusing and zooming, and a solid-state imaging element that generates an imaging signal based on imaging light obtained through the lens unit. The solid-state imaging element is, for example, a CCD (Charge Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor) image sensor. The imaging unit 840 outputs captured image data converted into a digital signal to the control unit 820.

[0112] The operation unit 850 has a function of receiving an input signal (user operation signal) from a user. This operation unit 850 is configured with, for example, a button, a touch sensor, a trackball, etc. Here, the operation unit 850 is configured integrally with the display unit 810, and functions as a touch panel. This operation unit 850 outputs the input user operation signal to the control unit 820.

[0113] The sensor unit 860 has a function of acquiring information on the user's actions and state. For example, the sensor unit 860 includes a camera that captures the user's face and eyes, or the hand on which the wristband-type terminal 8 is attached. In addition, the sensor unit 860 may include, for example, a camera with a depth detection function, a microphone, a GPS, an infrared sensor, a light sensor, an electromyogram sensor, a nerve sensor, a pulse sensor, a body temperature sensor, a gyro sensor, an acceleration sensor, or a touch sensor. Of these, the electromyogram sensor, the nerve sensor, the pulse sensor, and the body temperature sensor may be provided in the band unit 8a. Such a sensor unit 860 can perform sensing at a position close to the user's hand, and therefore can detect the movement of the hand with high accuracy. The sensor unit 860 senses the user's actions and state, and outputs information indicating the sensing result to the control unit 820.

[0114] The control unit 820 functions as an arithmetic processing device and a control device, and controls the overall operation of the wristband type terminal 8 in accordance with various programs. The control unit 820 is configured, for example, with a CPU (Central Processing Unit) or a microprocessor. This control unit 820 may include a ROM (Read Only Memory) that stores the programs to be used, arithmetic parameters, etc., and a RAM (Random Access Memory) that temporarily stores parameters that change as appropriate.

[0115] The control unit 820 has, for example, a recognition unit 821 and a detection unit 822, which allows gesture input. The recognition unit 821 has a function of recognizing the movement of the hand of the user wearing the band unit 8a. Specifically, the recognition unit 821 recognizes the movement of the hand by image recognition using an image (for example, an image of the user's hand) input from the sensor unit 860, motion recognition, and the like. The control unit 820 performs various processes such as screen transition based on the recognition result by the recognition unit 821. The detection unit 822 has a function of detecting a user operation on the projection image Y1 by the projection type display device 6. For example, the detection unit 822 detects a user operation such as a flick or touch on the projection image. The control unit 820 transmits information indicating the user operation detected by the detection unit 822 to the smartphone 7, and the smartphone 7 performs a process according to the user operation. As a result, in the wristband type terminal 8, a function (screen transition, etc.) similar to that when an operation (flick, touch, etc.) is performed on the touch panel of the smartphone 7 can be executed on the display unit 810 or the user's hand. For example, when the user flicks up or down on the projected image Y1, a function of scrolling the projected image Y1 can be executed.

[0116] In the example shown in FIG. 17, a map image generated by using a GPS (Global Positioning System) function in the smartphone 7 is displayed on the display unit 810 and projected as a projection image Y1. In the wristband type terminal 8, in order to realize portability, there is a limit to the physical size of the display unit 810, and the user may have difficulty viewing the image displayed on the display unit 810. In such a case, the projection type display device 6 is used to enlarge the image to, for example, the same inch size as the smartphone 7 and project it onto the hand, thereby improving the visibility of the image. In addition, the image received from the smartphone 7 can be viewed at hand while the smartphone 7 is in a pocket, bag, or the like, leading to improved usability.

[0117] In the display system as described above, the light source device (e.g., light source device 1) of the above-described embodiment can be suitably used when adjusting the color balance of the illumination light of the light source device 1 or when using infrared rays in the sensor section 860.

[0118] (Application example 3) 19 is a schematic diagram showing the configuration of a display system according to Application Example 3. This display system includes a projection display device 6 equipped with a light source device (for example, light source device 1) according to the above-described embodiment, a laser pointer 910, and a PC 920 that outputs content to be projected to the projection display device 6. The content to be projected includes charts, text, and various other graphic images, as well as maps and websites.

[0119] Laser pointer 910 has a function of emitting laser light (invisible light or visible light) in response to a user pressing operation button 910a. Using laser pointer 910, a user can irradiate an image projected on screen 930 with laser light and perform a presentation while, for example, pointing to an irradiation position P at a point to be explained.

[0120] The PC 920 generates image data for projection, transmits this image data to the projection display device 6 via a wired or wireless connection, and controls the projection. Although a notebook PC is shown as an example in Fig. 19, the PC 920 is not limited to a notebook PC and may be a desktop PC or a server on a network (cloud).

[0121] In this application example, the projection display device 6 projects an image received from the PC 920 onto the screen 930 and has an imaging unit for recognizing irradiation of the projected image by the laser pointer 910. The imaging unit is capable of detection using laser light (invisible light or visible light) irradiated onto the screen 930. This imaging unit may be built into the projection display device 6 or may be attached externally. In the projection display device 6, the light source device (for example, the light source device 1) of the above-mentioned embodiment is used, so that it is possible to output a composite light of a plurality of wavelengths using one type of light source as described above. This eliminates the need to provide a light source for projection and a light source for imaging separately, and thus makes it possible to simplify and compact the entire device.

[0122] Although the first to third embodiments, the first to seventh modifications, and application examples have been described above, the present disclosure is not limited to the above-mentioned embodiments, etc., and various modifications are possible. For example, the arrangement and number of components of the optical system (e.g., light source units 11 and 15, wavelength conversion unit, polarization separation element 13, color separation element 14, light collection optical system 16, etc.) exemplified in the above-mentioned embodiments are merely examples, and it is not necessary to include all the components, and other components may also be included.

[0123] Furthermore, the projection type display device and the display system described as application examples of the light source device (for example, the light source device 1) of the above-mentioned embodiment and the like are merely examples, and are not limited to those described above. For example, the light source device of the present disclosure can also be applied to a night vision device (night vision system) using infrared rays.

[0124] Furthermore, the projection display device according to the present disclosure may be configured as a device other than the projection display device 6 (6A, 6B). The light source device according to the present disclosure may be used in a device other than a projection display device. For example, the light source device 1 according to the present disclosure may be used for illumination purposes, and may be applicable to, for example, a light source for automobile headlamps or lighting.

[0125] It should be noted that the effects described in this specification are merely examples and are not limited to those described, and other effects may also be obtained.

[0126] The present technology can also be configured as follows. According to the present technology configured as follows, a polarization separation element that separates the light in the second wavelength range emitted from the wavelength conversion unit based on polarization is provided between the first light source unit and the wavelength conversion unit, and a color separation element that separates the light based on the wavelength range of the incident light is provided between the polarization separation element and the first light source unit, thereby improving the utilization efficiency of the fluorescence (light in the second wavelength range) emitted from the wavelength conversion unit. Therefore, it is possible to improve the efficiency of extracting light with aligned polarization. (1) a first light source unit that emits light in a first wavelength range; A light source arranged on the optical path of the light in the first wavelength range R, a wavelength conversion unit that is excited by the light in the first wavelength range emitted from the first light source unit and emits light in a second wavelength range different from the first wavelength range; A light source unit is disposed between the first light source unit and the wavelength conversion unit. R, a polarization separation element that separates incident light based on polarization; A light source unit is disposed between the first light source unit and the polarization separation element. and is transmitted through the polarization separation element or reflected from the polarization separation element. A color separation element that separates the incident light based on its wavelength range; A light source device comprising: (2) The light source device according to (1) above, further comprising a second light source unit that emits light in a third wavelength range different from the light in the second wavelength range. (3) The above The light source device according to (2), wherein the second light source section has a plurality of light sources that emit light in different wavelength ranges. (4) The light source device according to any one of (1) to (3), wherein the polarization separation element also serves as a light path synthesis element. (5) The light source device according to any one of (2) to (4), wherein the light in the second wavelength range and the light in the third wavelength range are optically combined by the polarization separation element. (6) The first light source unit and the second light source unit are disposed opposite to each other in one direction, The polarization separation element is disposed between the first light source unit and the second light source unit, The light source device according to any one of (2) to (5), wherein the wavelength conversion section is disposed opposite the polarization separation element in another direction perpendicular to the one direction. (7) The first light source unit and the wavelength conversion unit are disposed opposite to each other in one direction, The polarization separation element is disposed between the first light source unit and the wavelength conversion unit, The light source device according to any one of (2) to (5), wherein the second light source unit is arranged opposite the polarization separation element in another direction perpendicular to the one direction. (8) The light source device according to any one of (1) to (7), wherein the polarization separation element is a plate-type or prism-type polarization beam splitter. (9) The light source device according to any one of (1) to (8), wherein the color separation element is a dichroic mirror. (10) The light source device according to any one of (1) to (9), further comprising a focusing optical system between the wavelength conversion section and the polarization separation element. (11) The light source device according to (10), wherein the focusing optical system includes a collimating lens. (12) The light source device according to any one of (1) to (11), further comprising a polarization conversion element disposed between the wavelength conversion unit and the polarization separation element, which changes the polarization of the light in the second wavelength range reflected by the polarization separation element. (13) The light source device according to (12), wherein the polarization conversion element is a depolarization element. (14) The light source device according to (12), wherein the polarization conversion element is a retardation plate. (15) The polarization separation element is a prism-type polarizing beam splitter, The color separation element is one surface of the prism-type polarizing beam splitter; The light source device according to any one of (1) to (14), which is integrated. (16) The light source device according to any one of (1) to (15), wherein the wavelength conversion unit is a reflective type that emits light in the second wavelength range in the incident direction of light in the first wavelength range. (17) The light source device according to any one of (1) to (16), wherein the wavelength conversion section has a phosphor and a support substrate that supports the phosphor. (18) The light source device according to (17), wherein the wavelength conversion section further includes a drive section that rotates the support substrate. (19) The light source device according to any one of (1) to (18), further comprising at least one of a first angle adjustment mechanism for adjusting the angle of the polarization separation element and a second angle adjustment mechanism for adjusting the angle of the color separation element. (20) A light source device; a light modulation element that modulates the light emitted from the light source device; a projection optical system that projects the light from the light modulation element, The light source device includes: a first light source unit that emits light in a first wavelength range; A light source arranged on the optical path of the light in the first wavelength range R, a wavelength conversion unit that is excited by the light in the first wavelength range emitted from the first light source unit and emits light in a second wavelength range different from the first wavelength range; A light source unit is disposed between the first light source unit and the wavelength conversion unit. R, a polarization separation element that separates incident light based on polarization; A light source unit is disposed between the first light source unit and the polarization separation element. and is transmitted through the polarization separation element or reflected from the polarization separation element. A color separation element that separates the incident light based on its wavelength range; A projection display device having the above structure.

[0127] This application claims priority based on Japanese Patent Application No. 2019-230027, filed on December 20, 2019 in the Japan Patent Office, the entire contents of which are incorporated herein by reference.

[0128] Those skilled in the art will recognize that various modifications, combinations, subcombinations, and variations may occur to those skilled in the art depending on design requirements and other factors, and that such modifications are within the scope of the appended claims and their equivalents.

Claims

1. a first light source unit that emits light in a first wavelength range; a wavelength conversion unit that is arranged on an optical path of the light in the first wavelength range, is excited by the light in the first wavelength range emitted from the first light source unit, and emits light in a second wavelength range different from the first wavelength range; a polarization separation element disposed between the first light source unit and the wavelength conversion unit and configured to separate incident light based on polarization; a color separation element that is disposed between the first light source unit and the polarization separation element and separates the light that is transmitted through the polarization separation element or is reflected from the polarization separation element and incident thereon based on a wavelength range; A light source device comprising:

2. The light source device according to claim 1 , further comprising a second light source unit that emits light in a third wavelength range different from the light in the second wavelength range.

3. The light source device as described in claim 2, wherein the second light source unit has a plurality of light sources that emit light in different wavelength ranges.

4. The light source device according to claim 1 , wherein the polarization separation element also serves as a light path synthesis element.

5. The light source device according to claim 2 , wherein the light in the second wavelength range and the light in the third wavelength range are optically combined by the polarization separation element.

6. The first light source unit and the second light source unit are disposed opposite to each other in one direction, The polarization separation element is disposed between the first light source unit and the second light source unit, The light source device according to claim 2 , wherein the wavelength conversion section is disposed opposite to the polarization separation element in another direction perpendicular to the one direction.

7. The first light source unit and the wavelength conversion unit are disposed opposite to each other in one direction, The polarization separation element is disposed between the first light source unit and the wavelength conversion unit, The light source device according to claim 2 , wherein the second light source section is disposed opposite the polarization separation element in another direction perpendicular to the one direction.

8. 2. The light source device according to claim 1, wherein the polarization separation element is a plate-type or prism-type polarization beam splitter.

9. The light source device according to claim 1 , wherein the color separation element is a dichroic mirror.

10. The light source device according to claim 1 , further comprising a focusing optical system between the wavelength conversion section and the polarization separation element.

11. The light source device according to claim 10 , wherein the focusing optical system includes a collimating lens.

12. The light source device according to claim 1 , further comprising a polarization conversion element disposed between the wavelength conversion section and the polarization separation element, for changing the polarization of the light in the second wavelength range reflected by the polarization separation element.

13. The light source device according to claim 12 , wherein the polarization conversion element is a depolarizing element.

14. The light source device according to claim 12 , wherein the polarization conversion element is a retardation plate.

15. the polarization separation element is a prism-type polarization separation beam splitter, 2. The light source device according to claim 1, wherein the color separation element is integrated with one surface of the prism-type polarizing beam splitter.

16. The light source device according to claim 1 , wherein the wavelength conversion portion is of a reflective type that emits light in the second wavelength range in a direction in which light in the first wavelength range is incident.

17. The light source device according to claim 1 , wherein the wavelength conversion portion comprises a phosphor and a support substrate that supports the phosphor.

18. The light source device according to claim 17 , wherein the wavelength conversion section further comprises a drive section that rotates the support substrate.

19. The light source device according to claim 1 , further comprising at least one of a first angle adjustment mechanism for adjusting an angle of the polarization separation element and a second angle adjustment mechanism for adjusting an angle of the color separation element.

20. A light source device; a light modulation element that modulates the light emitted from the light source device; a projection optical system that projects the light from the light modulation element, The light source device is a first light source unit that emits light in a first wavelength range; a wavelength conversion unit that is arranged on an optical path of the light in the first wavelength range, is excited by the light in the first wavelength range emitted from the first light source unit, and emits light in a second wavelength range different from the first wavelength range; a polarization separation element disposed between the first light source unit and the wavelength conversion unit and configured to separate incident light based on polarization; a color separation element that is disposed between the first light source unit and the polarization separation element and separates the light that is transmitted through the polarization separation element or is reflected from the polarization separation element and incident thereon based on a wavelength range; A projection display device having the above structure.

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