Projector

Abstract

To provide a projector that suppresses a decrease in color reproducibility of a projected enlarged image.SOLUTION: A projector P1 comprises: a first light source device that includes a first light-emitting element for emitting first color light and a first wavelength conversion portion for converting a part of the first color light from the first light-emitting element into second color light, and emits third color light containing the first color light and the second color light; a first light guide element that includes a first incident end portion on which the third color light emitted from the first light source device is incident, a first emission end portion from which the third color light incident from the first incident end portion is emitted, and a first reflection surface which reflects the third color light incident from the first incident end portion by an inner surface; a first filter that is disposed at an emission side of the first light guide element, transmits color light of a first wavelength out of the third color light and reflects color light of a second wavelength out of the third color light toward the first light guide element; a first light modulation element that modulates the color light of the first wavelength to form a projection image; and a projection lens that projects the projection image as an enlarged image.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a projector. [Background technology]

[0002] A projector that uses light-emitting diodes as a light source device is described in Patent Document 1. The projector in this document includes three light-emitting diodes, three light modulation elements corresponding to the three light-emitting diodes, a dichroic prism that combines the modulated light emitted from the three light modulation elements into one modulated light, and a projection lens that projects the combined modulated light as an enlarged image. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2000-180962 Summary of the Invention [Problem to be solved by the invention]

[0004] A light-emitting diode may include a light-emitting element that emits a first color light and a light conversion unit that converts a portion of the first color light from the light-emitting element into a second color light. The light-emitting diode emits a third color light that includes the first color light and the second color light. For example, if the light-emitting diode emits green light as the third color, the light-emitting element emits blue light as the first color light. The light conversion unit is a fluorescent layer that converts a portion of the blue light into green light as the second color light. This green light as the third color light may include color light in an unnecessary wavelength band, such as intermediate color light in a wavelength band between green light and blue light or intermediate color light in a wavelength band between green light and red light. If color light in an unnecessary wavelength band is included in the third color light, which includes the first color light and the second color light obtained by converting the first color light, there is a problem in that the color reproducibility of the enlarged image projected by the projector is reduced. [Means for solving the problem]

[0005] In order to solve the above problem, the projector of the present invention is characterized by comprising: a first light source device including a first light-emitting element that emits a first color light and a first wavelength conversion unit that converts a portion of the first color light from the first light-emitting element into a second color light, and that emits a third color light including the first color light and the second color light; a first light-guiding element that includes a first incident end into which the third color light emitted from the first light source device is incident, a first exit end from which the third color light incident from the first incident end exits, and a first reflecting surface that internally reflects the third color light incident from the first incident end; a first filter that is arranged on the exit side of the first light-guiding element and transmits color light of a first wavelength among the third color light and reflects color light of a second wavelength among the third color light toward the first light-guiding element; a first light modulation element that modulates the color light of the first wavelength to form a projected image; and a projection lens that projects the projected image as an enlarged image. [Brief explanation of the drawings]

[0006] [Figure 1] FIG. 1 is a schematic diagram of a main part of a projector according to a first embodiment. [Figure 2] FIG. 4 is a diagram illustrating the function of a first filter. [Figure 3] 5A and 5B are diagrams illustrating a frame member that constitutes the first light guide element. [Figure 4] FIG. 10 is a schematic diagram of a main part of a projector according to a first modified example of the first embodiment. [Figure 5] FIG. 10 is a schematic diagram of a main part of a projector according to a second modification of the first embodiment. [Figure 6] FIG. 10 is an explanatory diagram showing the main parts of a projector according to a second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0007] DETAILED DESCRIPTION OF THE INVENTION Hereinafter, a projector according to an embodiment of the invention will be described with reference to the drawings.

[0008] (Embodiment 1) FIG. 1 is a schematic diagram of a main part of a projector 100 according to a first embodiment. FIG. 2 is a diagram illustrating the function of a first filter 7. As shown in FIG. 1, the projector 100 projects an enlarged image onto a screen S. The projector 100 includes a first light source device 1, a first light guide element 2, a first filter 7, a first collimating element 3, a first polarizing element 4, a first light modulation element 5, a second polarizing element 6, a projection lens 8, and a control unit 9.

[0009] The first light source device 1 includes a first light emitting element 11 that emits a first color light L1, and a first wavelength conversion unit 12 that converts a portion of the first color light L1 from the first light emitting element 11 into a second color light L2. The first light source device 1 emits a third color light L3 that includes the first color light L1 and the second color light L2.

[0010] The first light emitting element 11 is an LED element. In this embodiment, the first light emitting element 11 emits blue light as the first colored light L1. The wavelength band of the blue light is, for example, 420 nm to 490 nm.

[0011] The first wavelength conversion section 12 is a fluorescent layer 120. In this embodiment, the fluorescent layer 120 is a red / green fluorescent layer. The fluorescent layer 120 is excited by the blue light emitted from the first light emitting element 11 and converts the blue light into red light and green light, which are the second colored light L2. The wavelength band of the red light is, for example, 590 nm to 680 nm. The wavelength band of the green light is, for example, 490 nm to 590 nm. Therefore, in this embodiment, the third colored light L3 emitted by the first light source device 1 is white light. The wavelength band of the white light is, for example, 420 nm to 680 nm.

[0012] The first light guide element 2 reflects the third colored light L3 incident from the first light source device 1 on its inner surface and outputs the third colored light L3. The first filter 7 is disposed on the output side of the first light guide element 2. The first filter 7 is a bandpass filter. As shown in FIG. 2, the first filter 7 transmits colored light L31 of a first wavelength among the third colored light L3 and reflects colored light L32 of a second wavelength among the third colored light L3 toward the first light guide element 2. In this embodiment, the colored light L31 of the first wavelength is white light including blue light of 420 nm to 470 nm, green light of 490 nm to 570 nm, and red light of 590 nm to 680 nm. The colored light L32 of the second wavelength is mixed light including first intermediate color light LC of 470 nm to 490 nm and second intermediate color light LY of 570 nm to 590 nm. That is, the first intermediate color light LC is light between blue light and green light, and the second intermediate color light LY is light between green light and red light. Note that the first intermediate color light LC corresponds to the color light of the third wavelength of the present invention, and the second intermediate color light LY corresponds to the color light of the fourth wavelength of the present invention.

[0013] The first collimating element 3 is disposed between the first light guide element 2 and the first polarizing element 4. The first collimating element 3 collimates the color light L31 of the first wavelength emitted from the first light guide element 2. As shown in FIG. 1 , the first collimating element 3 is, for example, a lens having a flat incident surface 310 and a convex exit surface. In this embodiment, the first filter 7 is disposed on the incident surface 310 of the first collimating element 3.

[0014] The first polarizing element 4 reflects either the P polarized component (first polarized component) or the S polarized component (second polarized component) and transmits the other polarized component contained in the colored light L31 of the first wavelength output from the first collimating element 3. In this embodiment, the first polarizing element 4 reflects the S polarized component and transmits the P polarized component of the polarized components contained in the colored light L31 of the first wavelength output from the first collimating element 3.

[0015] The first light modulation element 5 modulates the color light L31 of the first wavelength from the first polarizing element 4 into modulated light to form a projected image. The first light modulation element 5 is, for example, a liquid crystal panel 51. In this embodiment, the liquid crystal panel 51 is made up of a single panel and has pixels corresponding to the light of each color. As a result, the liquid crystal panel 51 modulates the color light L31 of the first wavelength, which is white light, in accordance with the color light corresponding to each pixel, to form full-color image light.

[0016] The second polarizing element 6 is disposed on the exit side of the first light modulation element 5, and transmits either the P polarized component (first polarized component) or the S polarized component (second polarized component) of the polarized components contained in the modulated light exiting from the first light modulation element 5. In this embodiment, the second polarizing element 6 transmits the S polarized component of the polarized components contained in the modulated light exiting from the first light modulation element 5.

[0017] The projection lens 8 includes a plurality of lenses. The projection lens 8 enlarges the projection image and projects the enlarged image onto the screen S. The control unit 9 operates the first light modulation element 5 based on an external image signal such as a video signal.

[0018] (First light guide element) Fig. 3 is a diagram illustrating a frame member 24 that constitutes the first light guide element 2. As shown in Fig. 1, the first light guide element 2 includes a first incident end 21 into which the third color light L3 emitted from the first light source device 1 is incident, a first emitting end 22 from which the third color light L3 incident from the first incident end 21 exits, and a first reflecting surface 23 that internally reflects the third color light L3 incident from the first incident end 21.

[0019] The first light guide element 2 has a hollow structure and is a cylindrical reflector having openings at the first incident end 21 and the first exit end 22. A first incident surface 210 is formed at the first incident end 21. A first exit surface 220 is formed at the first exit end 22. As shown in FIG. 1 , the first exit surface 220 formed at the first exit end 22 is larger than the first incident surface 210 formed at the first incident end 21. Therefore, the cross-sectional area of ​​the first light guide element 2 cut along a plane perpendicular to the optical axis N of the first light guide element 2 increases from the first incident end 21 to the first exit end 22. In this embodiment, the cross-sectional shape of the first light guide element 2 cut along a plane perpendicular to the optical axis N is rectangular.

[0020] The first light guide element 2 is composed of a plate-shaped frame member 24. The frame member 24 includes a first base material 25 and a first reflective film 26 provided on the first base material 25. The first reflective film 26 is a first reflective surface 23. The first reflective film 26 is a bandpass filter that reflects the first intermediate color light LC and transmits the second intermediate color light LY. The first base material 25 is also a bandpass filter that transmits or absorbs the second intermediate color light LY.

[0021] (Action and effect) The projector 100 includes a first light source device 1, a first light guide element 2, a first filter 7, a first light modulation element 5, and a projection lens 8. The first light source device 1 includes a first light-emitting element 11 that emits blue light and a first wavelength conversion unit 12 that converts a portion of the blue light from the first light-emitting element 11 into green light and red light, and emits white light containing blue light, green light, and red light. The first light guide element 2 includes a first incident end 21 into which the white light emitted from the first light source device 1 enters, a first exit end 22 from which the white light incident from the first incident end 21 exits, and a first reflecting surface 23 that internally reflects the white light incident from the first incident end 21. The first filter 7 is disposed on the exit side of the first light guide element 2 and transmits color light L31 of a first wavelength out of the white light and reflects color light L32 of a second wavelength out of the white light toward the first light guide element 2. The first light modulation element 5 modulates the color light L31 of the first wavelength to form a projection image. The projection lens 8 projects the projection image as an enlarged image.

[0022] The second wavelength color light L32 includes the third wavelength color light and the fourth wavelength color light. The third wavelength color light is a first intermediate color light LC between blue light and green light. The fourth wavelength color light is a second intermediate color light LY between green light and red light.

[0023] According to the projector 100 of this embodiment, the first filter 7 transmits color light L31 of first wavelengths, which are blue light of 420 nm to 470 nm, green light of 490 nm to 570 nm, and red light of 590 nm to 680 nm, and reflects color light L32 of second wavelengths, which includes first intermediate color light LC of 470 nm to 490 nm and second intermediate color light LY of 570 nm to 590 nm, toward the first light-guiding element 2, thereby improving the color reproducibility of the enlarged image projected onto the screen S.

[0024] The first light guide element 2 includes a first substrate 25 and a first reflective film 26 disposed on the first substrate 25. The first reflective film 26 forms a first reflective surface 23. The first reflective film 26 reflects the first intermediate color light LC and transmits the second intermediate color light LY. The first substrate 25 transmits or absorbs the second intermediate color light LY. As a result, the first intermediate color light LC reflected by the first reflective film 26 is excited again by the fluorescent layer 120, converted into green light, and reaches the first filter 7, thereby increasing the intensity of the green light contained in the first-wavelength color light L31. As a result, the magnified image becomes brighter and the color reproducibility of the magnified image improves. Furthermore, the first substrate 25 eliminates the second intermediate color light LY, which has difficulty exciting the fluorescent layer 120, thereby preventing the second intermediate color light LY from remaining between the first light source device 1 and the first filter 7. As a result, the first light guide element 2 and the first filter 7 are less likely to generate heat due to the second intermediate color light LY, and therefore the durability of the first light guide element 2 and the first filter 7 is improved.

[0025] The projector 100 includes a first collimating element 3 that is disposed between the first light guide element 2 and the first light modulation element 5 and that collimates the color light L31 of the first wavelength that is emitted from the first light guide element 2. The first filter 7 is disposed on an incident surface 310 of the first collimating element 3. This allows the color light L31 of the first wavelength that is incident on the first light modulation element 5 to be collimated. Furthermore, by integrating the first filter 7 and the first collimating element 3, the projector 100 can be made smaller.

[0026] The cross section of the first light guide element 2 cut along a plane perpendicular to the optical axis N of the first light guide element 2 has a rectangular shape. This allows the luminous flux of the colored light L31 of the first wavelength emitted from the first emission surface 230 to have a rectangular shape, so that the first light guide element 2 can efficiently illuminate the first light modulation element 5.

[0027] The first emission surface 220 formed at the first emission end 22 is larger than the first incidence surface 210 formed at the first incidence end 21. This allows the first light guide element 2 to expand the luminous flux while making the illuminance distribution of the color light L31 of the first wavelength uniform.

[0028] (Modification of the first embodiment) Fig. 4 is a schematic diagram of a main part of a projector 100A according to a first modification of the first embodiment. Fig. 5 is a schematic diagram of a main part of a projector 100B according to a second modification of the first embodiment.

[0029] 4, in the projector 100A of the first modification, the first filter 7 is disposed on the incident surface 410 of the first polarizing element 4. As a result, the third color light L3 incident on the first filter 7 is collimated by the first collimating element 3, and therefore, the loss of light when passing through the first filter 7 is reduced compared to when the third color light L3 is not collimated.

[0030] As shown in FIG. 5 , in the projector 100B of the second modification, the first filter 7 is disposed on the incident surface 52 of the first light modulation element 5. The first polarizing element 4 reflects either the P-polarized component (first polarized component) or the S-polarized component (second polarized component) of the third color light L3 emitted from the first collimating element 3, and transmits the other. As a result, the third color light L3 incident on the first filter 7 is light containing only one of the P-polarized component and the S-polarized component. Therefore, the light intensity of the third color light L3 incident on the first filter 7 is lower than in the case of color light containing both the P-polarized component and the S-polarized component. As a result, the amount of light received by the first filter 7 is reduced, thereby improving the durability of the first filter 7.

[0031] (Embodiment 2) 6 is an explanatory diagram showing a main part of a projector 100C according to a second embodiment. As shown in FIG. 6, the projector 100C according to the second embodiment is a three-panel projector. The projector 100C includes a first light source device 1G, a first light guide element 2G, a first collimating element 3G, a first filter 7, a first polarizing element 4G, a first light modulation element 5G, and a second polarizing element 6G, a second light source device 1R, a second light guide element 2R, a second collimating element 3R, a first polarizing element 4R, a second light modulation element 5R, and a second polarizing element 6R, a third light source device 1B, a third light guide element 2B, a third collimating element 3B, a first polarizing element 4B, a third light modulation element 5B, and a second polarizing element 6B, a light combining element 10, a projection lens 8, and a control unit. The control unit operates the first light modulation element 5G, the second light modulation element 5R, and the third light modulation element 5B based on an external image signal such as a video signal.

[0032] The first light source device 1G includes a first light emitting element 11 that emits a first color light L1 and a first wavelength conversion unit 12 that converts a portion of the first color light L1 from the first light emitting element into a second color light L2. The first light source device 1G emits a third color light L3 that includes the first color light L1 and the second color light L2.

[0033] The first light emitting element 11 is an LED element. In this embodiment, the first light emitting element 11 emits blue light as the first colored light L1. The wavelength band of the blue light is, for example, 420 nm to 490 nm.

[0034] The first wavelength converter 12 is a fluorescent layer 120. In this embodiment, the fluorescent layer 120 is a green fluorescent layer. The fluorescent layer 120 converts the blue light emitted from the first light emitting element 11 into green light, which is the second colored light L2. Therefore, in this embodiment, the third colored light L3 emitted by the first light source device 1G is green light. The wavelength band of the green light is, for example, 470 nm to 590 nm, and includes part of the wavelength band of the blue light.

[0035] The second light source device 1R emits a fourth colored light L4 that is different from the third colored light L3. The third light source device 1B emits a fifth colored light L5 that is different from the third colored light L3 and the fourth colored light L4. The second light source device 1R and the third light source device 1B are LED light sources. The fourth colored light L4 is red light. The wavelength band of the red light is, for example, 590 nm to 680 nm. The fifth colored light L5 is blue light. The wavelength band of the blue light is, for example, 420 nm to 490 nm.

[0036] The first light guide element 2G reflects the third colored light L3 incident from the first light source device 1G on its inner surface and emits it. The first light guide element 2G has the same configuration as the first light guide element 2 of the first embodiment. Therefore, a detailed description of the first light guide element 2G will be omitted. Therefore, the first intermediate color light LC reflected by the first reflective film 26 is excited again by the fluorescent layer 120, converted into green light, and reaches the first filter 7, thereby increasing the intensity of the green light contained in the colored light L31 of the first wavelength. Furthermore, the first base material 25 eliminates the second intermediate color light LY, which has difficulty exciting the fluorescent layer 120, and thus can prevent the second intermediate color light LY from remaining between the first light source device 1 and the first filter 7.

[0037] The second light guide element 2R includes a second incident end 21R into which the fourth color light L4 emitted from the second light source device 1R is incident, a second exit end 22R from which the fourth color light L4 incident from the second incident end 21R is emitted, and a second reflecting surface 23R that internally reflects the fourth color light L4 incident from the second incident end 21R. The third light guide element 2B includes a third incident end 21B into which the fifth color light L5 emitted from the third light source device 1B is incident, a third exit end 22B from which the fifth color light L5 incident from the third incident end 21B is emitted, and a third reflecting surface 23B that internally reflects the fifth color light L5 incident from the third incident end 21B. Here, the second light guide element 2R and the third light guide element 2B may have the same configuration as or different from the first light guide element 2G.

[0038] The first filter 7 is disposed on the exit side of the first light guide element 2G. The first filter 7 is a bandpass filter. The first filter 7 transmits colored light L31 of the third colored light L3 having a first wavelength and reflects colored light L32 of the third colored light L3 having a second wavelength toward the first light guide element 2. In this embodiment, the colored light L31 of the first wavelength is green light of 490 nm to 570 nm. The colored light L32 of the second wavelength is a mixed light including first intermediate colored light LC of 470 nm to 490 nm and second intermediate colored light LY of 570 nm to 590 nm. The first intermediate colored light LC corresponds to the colored light of the third wavelength of the present invention, and the second intermediate colored light LY corresponds to the colored light of the fourth wavelength of the present invention.

[0039] The first collimating element 3G collimates the colored light L31 of the first wavelength emitted from the first light guide element 2G. The first filter 7 is disposed on the incident surface of the first collimating element 3. The second collimating element 3R collimates the fourth colored light L4 emitted from the second light guide element 2R. The third collimating element 3B collimates the fifth colored light L5 emitted from the third light guide element 2B.

[0040] Each first polarizing element 4 reflects one of the P polarized component (first polarized component) or the S polarized component (second polarized component) of the polarized components contained in the colored light emitted from each parallelizing element 3, and transmits the other.

[0041] The first light modulation element 5G modulates the first wavelength color light L31 into modulated light to form a green projection image. The second light modulation element 5R modulates the fourth color light L4 into modulated light to form a red projection image. The third light modulation element 5B modulates the fifth color light L5 into modulated light to form a blue projection image. Each light modulation element 5 is a liquid crystal panel.

[0042] Each second polarizing element 6 reflects one of the P polarized component (first polarized component) or the S polarized component (second polarized component) of the polarized components contained in the modulated light output from each light modulation element 5, and transmits the other.

[0043] The modulated light from each light modulation element 5 is incident on the light combining element 10 from a different direction. The projector 100C projects the full-color projection image output from the light combining element 10 onto the screen S as an enlarged image.

[0044] (Action and effect) According to projector 100C of embodiment 2, first filter 7 is disposed on the emission side of first light source device 1G that emits green light, and therefore the light intensity of the green light contained in the modulated light combined by light combining element 10 is higher than when, for example, first filter 7 is disposed on the emission side of second light source device 1R. This increases the light intensity of the green light contained in the modulated light projected from projector 100C, and therefore the projected enlarged image becomes a vivid image and the color reproducibility of the enlarged image is improved.

[0045] (Other embodiments) In the above embodiment, the first filter 7 is provided on the incident surface of the first parallelizing element 3, the first polarizing element 4, and the first light modulation element 5, but the first filter 7 may be a component independent of the first parallelizing element 3, the first polarizing element 4, and the first light modulation element 5.

[0046] In the above embodiment, the first reflective film 26 reflects the first intermediate color light LC and transmits the second intermediate color light LY, but the first reflective film 26 may reflect both the first intermediate color light LC and the second intermediate color light LY. In other words, the first reflective film 26 may reflect color light of all wavelengths.

[0047] In the first embodiment, the first filter 7 reflects the colored light of 470 nm to 490 nm and the colored light of 570 nm to 590 nm as the second wavelength colored light L32, but the first filter 7 may reflect only the colored light of 470 nm to 490 nm. Even in this case, the light intensity of the green light included in the first wavelength colored light L31 is increased, so the enlarged image becomes brighter and the color reproducibility of the enlarged image is improved.

[0048] In the first embodiment, the first filter 7 reflected colored light of 470 nm to 490 nm and colored light of 570 nm to 590 nm as the second wavelength colored light L32, but the first filter 7 may also reflect colored light of other wavelength bands. For example, the first filter 7 may reflect colored light of 420 nm to 440 nm as another wavelength band. In this case, because short-wavelength blue light is removed from the third colored light L3, the first light modulation element 5 is less likely to be deteriorated by short-wavelength blue light.

[0049] In the second embodiment, the first light source device 1G emits the third color light L3 including blue light and green light. However, the first light source device 1G may emit light of another color. For example, the first light source device 1G may emit the third color light L3 including blue light and red light. In this case, the first filter 7 may reflect color light having a wavelength between the blue light and the red light (color light having a second wavelength) toward the first light guide element 2.

[0050] In the second embodiment, the first filter 7 is disposed on the output side of the first light guide element 2G, but the first filter 7 may also be disposed on the output side of each of the second light guide element 2R and the third light guide element 2B, as necessary.

[0051] Summary of this disclosure A summary of this disclosure is provided below.

[0052] (Appendix 1) a first light source device including a first light emitting element that emits a first color light and a first wavelength conversion unit that converts a part of the first color light from the first light emitting element into a second color light, and that emits a third color light including the first color light and the second color light; a first light guide element including a first incident end portion into which the third color light emitted from the first light source device is incident, a first emitting end portion from which the third color light incident from the first incident end portion exits, and a first reflecting surface that internally reflects the third color light incident from the first incident end portion; a first filter disposed on an exit side of the first light guide element, the first filter transmitting color light of a first wavelength among the third color light and reflecting color light of a second wavelength among the third color light toward the first light guide element; a first light modulation element that modulates the color light of the first wavelength to form a projection image; a projection lens that projects the projected image as an enlarged image; A projector comprising:

[0053] This eliminates the second wavelength colored light from the third colored light, improving the color reproducibility of the projected magnified image. Also, the second wavelength colored light reflected by the first light guide element is converted back into the second colored light by the first wavelength converter before reaching the first filter, increasing the light intensity of the third colored light.

[0054] (Appendix 2) The projector described in Appendix 1 further comprises a first collimating element disposed between the first light guide element and the first light modulation element, which collimates the color light of the first wavelength emitted from the first light guide element.

[0055] This allows the color light of the first wavelength incident on the first light modulation element to be collimated.

[0056] (Appendix 3) The projector described in Supplementary Note 2, wherein the first filter is disposed on an incident surface of the first parallelizing element.

[0057] This allows the first filter and the first collimating element to be integrated, thereby making the projector more compact.

[0058] (Appendix 4) a first polarizing element disposed between the first collimating element and the first light modulation element, which transmits a first polarized component and reflects a second polarized component of the polarized components included in the color light of the first wavelength; The projector described in Supplementary Note 2, wherein the first filter is disposed on the incident surface of the first polarizing element.

[0059] As a result, the third color light incident on the first filter is collimated by the first collimating element, and therefore the light loss when passing through the first filter is reduced compared to when the third color light is not collimated.

[0060] (Appendix 5) a first polarizing element disposed between the first collimating element and the first light modulation element, which transmits a first polarized component and reflects a second polarized component of the polarized components included in the color light of the first wavelength; The projector described in Supplementary Note 2, wherein the first filter is disposed on the incident surface of the first light modulation element.

[0061] As a result, the third color light incident on the first filter is composed of only one of the first and second polarized light components, and therefore the intensity of the third color light incident on the first filter is lower than when the third color light includes both the first and second polarized light components. As a result, the amount of light received by the first filter is reduced, improving the durability of the first filter.

[0062] (Appendix 6) the first color light is blue light, the third color light is white light, 6. The projector according to any one of claims 1 to 5, wherein the colored light of the second wavelength includes a first intermediate color light between blue light and green light.

[0063] This removes the unnecessary first intermediate color light from the white light, improving the color reproducibility of the full-color enlarged image.

[0064] (Appendix 7) a second light source device that emits a fourth color light different from the third color light; a third light source device that emits a fifth color light different from the third color light and the fourth color light; a second light guide element including a second incident end portion into which the fourth color light emitted from the second light source device is incident, a second emitting end portion from which the fourth color light incident from the second incident end portion is emitted, and a second reflecting surface that internally reflects the fourth color light incident from the second incident end portion; a third light guide element including a third incident end portion into which the fifth color light emitted from the third light source device is incident, a third emitting end portion from which the fifth color light incident from the third incident end portion is emitted, and a third reflecting surface that internally reflects the fifth color light incident from the third incident end portion; a second light modulation element that modulates the fourth color light to form a projection image; a third light modulation element that modulates the fifth color light to form a projection image; 6. The projector according to claim 1, further comprising:

[0065] This improves the color reproducibility of full-color enlarged images in three-chip projectors.

[0066] (Appendix 8) the first color light is blue light, the second color light is green light, 8. The projector according to claim 7, wherein the colored light of the second wavelength is blue light.

[0067] This removes blue light from the third color light, further improving the color reproducibility of the enlarged image.

[0068] (Appendix 9) The projector described in any one of appendixes 1 to 8, characterized in that the cross-sectional shape of the first light guide element when cut along a plane perpendicular to the optical axis of the first light guide element is rectangular.

[0069] This allows the light flux of the colored light of the first wavelength emitted from the first light guide element to have a rectangular shape, so that the first light guide element can efficiently illuminate the first light modulation element.

[0070] (Appendix 10) The projector described in Supplementary Note 9, wherein a first exit surface formed at the first exit end is larger than a first entrance surface formed at the first entrance end.

[0071] This allows the first light guide element to expand the light flux while making the illuminance distribution of the color light of the first wavelength uniform.

[0072] (Appendix 11) the first light guide element includes a first substrate and a first reflective film provided on the first substrate; the first reflective film is the first reflective surface, the color light of the second wavelength includes color light of a third wavelength and color light of a fourth wavelength, the first reflective film reflects the color light of the third wavelength and transmits the color light of the fourth wavelength; The projector described in any one of appendixes 1 to 5, wherein the base material transmits or absorbs color light of the fourth wavelength.

[0073] Thus, when the colored light of the fourth wavelength is colored light of a wavelength that is difficult to convert back into the second colored light by the first wavelength-converting unit, the first base material eliminates the colored light of the fourth wavelength, thereby preventing the colored light of the fourth wavelength from remaining between the first light source device and the first filter. As a result, the first light guide element and the first filter are less likely to generate heat due to the colored light of the fourth wavelength, improving the durability of the first light guide element and the first filter.

[0074] (Appendix 12) the third color light is white light, the third wavelength color light is a first intermediate color light between blue light and green light, The projector described in Appendix 11, wherein the fourth wavelength color light is a second intermediate color light between green light and red light.

[0075] As a result, the first intermediate color light is converted back into green light in the first wavelength converter and reaches the first filter, increasing the intensity of the green light. As a result, the magnified image becomes brighter and the color reproducibility of the magnified image improves. Furthermore, the first base material eliminates the second intermediate color light, which is difficult to convert into the second color light in the first wavelength converter, thereby preventing the second intermediate color light from remaining between the first light source device and the first filter. As a result, the first light guide element 2 and the first filter 7 are less likely to generate heat due to the second intermediate color light, improving the durability of the first light guide element and the first filter. [Explanation of symbols]

[0076] 100, 100A, 100B, 100C...projector, 1, 1G...first light source device, 1R...second light source device, 1B...third light source device, 2...light guide element, 2, 2G...first light guide element, 2R...second light guide element, 2B...third light guide element, 3, 3G...first collimating element, 3R...second collimating element, 3B...third collimating element, 4, 4G, 4R, 4B...first polarizing element, 5, 5G...first light modulation element, 5R...second light modulation element, 5B...third light modulation element, 6, 6G, 6R, 6B...second polarizing element, 7...first filter, 8...projection lens, 9...control unit, 10...light combining element, 11...first light emitting element, 12...first wavelength conversion unit, 21...second 1 incident end, 21R...second incident end, 21B...third incident end, 22...first output end, 22R...second output end, 22B...third output end, 23...first Reflective surface, 23R... Second reflective surface, 24... Frame member, 25... First base material, 26... First reflective film, 51... Liquid crystal panel, 52... Incident surface, 120... Fluorescent layer, 2 10...first entrance surface, 220...first exit surface, 310...incident surface, 410...incident surface, L1...first color light, L2...second color light, L3...third color light, L31...first wave Long color light, L32...second wavelength color light, L4...fourth color light, L5...fifth color light, LC...first intermediate color light, LY...second intermediate color light, N...optical axis, S...screen.

Claims

1. a first light source device including a first light-emitting element that emits first color light and a first wavelength conversion unit that converts a part of the first color light from the first light-emitting element into a second color light, and that emits a third color light including the first color light and the second color light; a first light guide element including a first incident end portion into which the third color light emitted from the first light source device is incident, a first emitting end portion from which the third color light incident from the first incident end portion exits, and a first reflecting surface that internally reflects the third color light incident from the first incident end portion; a first filter disposed on an exit side of the first light guide element, the first filter transmitting color light of a first wavelength among the third color light and reflecting color light of a second wavelength among the third color light toward the first light guide element; a first light modulation element that modulates the color light of the first wavelength to form a projection image; a projection lens that projects the projected image as an enlarged image; A projector comprising:

2. 2. The projector according to claim 1, further comprising: a first collimating element disposed between the first light guide element and the first light modulation element, the first collimating element collimating the color light of the first wavelength emitted from the first light guide element.

3. The projector according to claim 2 , wherein the first filter is disposed on an incident surface of the first collimating element.

4. a first polarizing element disposed between the first collimating element and the first light modulation element, which transmits a first polarized component and reflects a second polarized component of the polarized components included in the color light of the first wavelength; The projector according to claim 2 , wherein the first filter is disposed on an incident surface of the first polarizing element.

5. a first polarizing element disposed between the first collimating element and the first light modulation element, which transmits a first polarized component and reflects a second polarized component of the polarized components included in the color light of the first wavelength; The projector according to claim 2 , wherein the first filter is disposed on an incident surface of the first light modulation element.

6. the first color light is blue light, the third color light is white light, 6. The projector according to claim 1, wherein the color light of the second wavelength includes a first intermediate color light between blue light and green light.

7. a second light source device that emits a fourth color light different from the third color light; a third light source device that emits a fifth color light different from the third color light and the fourth color light; a second light guide element including a second incident end portion into which the fourth color light emitted from the second light source device is incident, a second emitting end portion from which the fourth color light incident from the second incident end portion is emitted, and a second reflecting surface that internally reflects the fourth color light incident from the second incident end portion; a third light guide element including a third incident end portion into which the fifth color light emitted from the third light source device is incident, a third emitting end portion from which the fifth color light incident from the third incident end portion is emitted, and a third reflecting surface that internally reflects the fifth color light incident from the third incident end portion; a second light modulation element that modulates the fourth color light to form a projection image; a third light modulation element that modulates the fifth color light to form a projection image; The projector according to claim 1 , further comprising:

8. the first color light is blue light, the second color light is green light, 8. The projector according to claim 7, wherein the colored light of the second wavelength is blue light.

9. 2. The projector according to claim 1, wherein the cross-sectional shape of the first light guide element when cut along a plane perpendicular to the optical axis of the first light guide element is rectangular.

10. The projector of claim 9 , wherein a first exit surface formed at the first exit end is larger than a first entrance surface formed at the first entrance end.

11. the first light guide element includes a first substrate and a first reflective film provided on the first substrate; the first reflective film is the first reflective surface, the color light of the second wavelength includes color light of a third wavelength and color light of a fourth wavelength, the first reflective film reflects the color light of the third wavelength and transmits the color light of the fourth wavelength; 6. The projector according to claim 1, wherein the base material transmits or absorbs the color light of the fourth wavelength.

12. the third color light is white light, the color light of the third wavelength is a first intermediate color light between blue light and green light, 12. The projector according to claim 11, wherein the fourth wavelength color light is a second intermediate color light between green light and red light.

Images