CN109459908B - Light source light path system of laser projector - Google Patents
Light source light path system of laser projector Download PDFInfo
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- CN109459908B CN109459908B CN201811610352.3A CN201811610352A CN109459908B CN 109459908 B CN109459908 B CN 109459908B CN 201811610352 A CN201811610352 A CN 201811610352A CN 109459908 B CN109459908 B CN 109459908B
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2006—Lamp housings characterised by the light source
- G03B21/2033—LED or laser light sources
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2066—Reflectors in illumination beam
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2073—Polarisers in the lamp house
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/208—Homogenising, shaping of the illumination light
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Abstract
A light source light path system of a laser projector comprises a blue light source, a polarization splitting light path arranged in the propagation direction of blue light to split the blue light into first polarized blue light and second polarized blue light which propagate in different directions, a wavelength conversion light path arranged in the propagation direction of the first polarized blue light to generate wide-spectrum non-uniform light based on the first polarized blue light, a non-uniform light path arranged in the propagation direction of the wide-spectrum non-uniform light to modulate the wide-spectrum non-uniform light to generate modulated wide-spectrum light, and a wide-spectrum light illumination light path arranged in the propagation direction of the modulated wide-spectrum light to illuminate a first display screen and a second display screen based on the modulated wide-spectrum light, a uniform light path arranged in the propagation direction of the second polarized blue light to modulate the second polarized blue light to generate modulated blue light, and a blue light illumination light path arranged in the propagation direction of the modulated blue light to illuminate a blue display screen based on the modulated blue light.
Description
Technical Field
The invention relates to the field of projectors, in particular to a light source light path system of a laser projector.
Background
The 3LCD system is to decompose light emitted from a bulb into three colors (three primary colors of light) of R (red), G (green), and B (blue), and to apply a shape and an operation to each of the three colors of light through the respective liquid crystal panels. Since these three primary colors are often projected, light can be effectively used, and a bright and clear image is revealed. The projector adopting the 3LCD mode has the characteristics of bright, natural, soft and the like. LCOS (Liquid Crystal on Silicon), liquid crystal on silicon, also called liquid crystal on silicon, is a very small size matrix liquid crystal display device based on a reflective mode. LCOS has the characteristics of high light efficiency, small volume, high aperture ratio, mature manufacturing technology and the like, and can easily realize high resolution and full color expression.
Existing 3LCD and LCOS systems mainly utilize a set of compound eye schemes PCS (Polerization conversion system) to modulate the illumination source into the opto-mechanical system. Wherein the compound eye and the PCS function to control the angle of the light source and to convert unpolarized light into polarized light, respectively. However, PCS is only about 70% -80% efficient at converting unpolarized light to polarized light, thus its efficiency is low, and the spread of the system (etendue) is reduced, thus further reducing the efficiency to below 50%.
Disclosure of Invention
The invention aims to solve the technical problems of the prior art, and provides a laser projector light source light path system for separately modulating co-modulation and non-co-modulation, wherein a non-co-modulation light path has no PCS, so that the loss of polarization conversion efficiency and the loss of system expansion are reduced, and the system efficiency is improved.
The invention relates to a light source light path system of a laser projector, which comprises a blue light source for emitting blue light, a light splitting light path arranged in the propagation direction of the blue light for splitting the blue light into first polarized blue light and second polarized blue light which propagate in different directions, a wavelength conversion light path arranged in the propagation direction of the first polarized blue light for generating wide-spectrum non-identical dimming based on the first polarized blue light, a non-coherent light path arranged in the propagation direction of the wide-spectrum non-identical dimming for modulating the wide-spectrum non-coherent light to generate modulated wide-spectrum light, and a wide-spectrum light illumination light path arranged in the propagation direction of the modulated wide-spectrum light for illuminating a first display screen and a second display screen based on the modulated wide-spectrum light, a coherent light path arranged in the propagation direction of the second polarized blue light for modulating the second polarized blue light to generate modulated blue light, and a blue light illumination light path arranged in the propagation direction of the modulated blue light display screen based on the modulated blue light.
In the light source light path system of the laser projector, the polarization beam splitting light path comprises a first phase delay element and a first spectroscope which are sequentially arranged in the propagation direction of the blue light, the blue light generates first polarized blue light and second polarized blue light through the first phase delay element, and the first spectroscope transmits the second polarized blue light and reflects the first polarized blue light.
In the light source light path system of the laser projector, the wavelength conversion light path comprises a first wavelength conversion element arranged in the reflection propagation direction of the first polarized blue light, the first wavelength conversion element converts the first polarized blue light into the wide-spectrum non-coherent light, and the wide-spectrum non-coherent light is reversely transmitted to the first spectroscope along the reflection propagation direction of the first polarized blue light and transmitted into the non-coherent light path by the first spectroscope.
In the light source light path system of the laser projector of the present invention, the wavelength conversion light path further includes a lens assembly and a diffusion plate disposed between the first wavelength conversion element and the first spectroscope, the diffusion plate being disposed near the first spectroscope, the lens assembly being disposed near the first wavelength conversion element.
In the light source light path system of the laser projector, the non-coherent light path comprises a compound eye component and a PCS component which are sequentially arranged in the propagation direction of the wide-spectrum non-coherent light.
In the light source light path system of the laser projector, the wide-spectrum light illumination light path comprises a second beam splitter, a first display screen and a second display screen; the second beam splitter is disposed in a propagation direction of the modulated broad spectrum light to transmit a first color light of the modulated broad spectrum light from the second beam splitter to enter a first display screen and to reflect a second color light of the modulated broad spectrum light from the second beam splitter to enter a second display screen.
In the light source light path system of the laser projector, the broad spectrum light illumination light path further comprises a first reflecting mirror and a second reflecting mirror, wherein the first reflecting mirror is arranged in the propagation direction of the first color light in an angle mode, the first display screen is arranged in the reflection direction of the first color light, the second reflecting mirror is arranged in the propagation direction of the second color light in an angle mode, and the second display screen is arranged in the reflection direction of the second color light.
In the light source light path system of the laser projector, the coherent light path comprises a second phase delay element and a compound eye component which are sequentially arranged in the propagation direction of the second polarized blue light.
In the light source light path system of the laser projector, the coherent light path further comprises a third reflector, the third reflector is arranged at an angle behind the second phase delay element in the propagation direction of the second polarized blue light, and the compound eye component is arranged in the reflection direction of the second polarized blue light.
In the light source light path system of the laser projector, the blue light illumination light path comprises a blue light display screen arranged in the propagation direction of the modulated blue light.
The light source light path system of the laser projector carries out separate modulation on coherent light and non-coherent light, wherein the non-coherent light path does not have PCS, thereby reducing the loss of polarization conversion efficiency and the loss of system expansion, and further improving the system efficiency.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic block diagram of a first embodiment of a laser projector light source optical path system of the present invention;
FIG. 2 is a light path diagram of a second embodiment of a laser projector light source light path system of the present invention;
fig. 3 is a light path diagram of a third embodiment of the light source light path system of the laser projector of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The light source light path system of the laser projector comprises a blue light source for emitting blue light, a light splitting light path arranged in the propagation direction of the blue light for splitting the blue light into first polarized blue light and second polarized blue light which propagate in different directions, a wavelength conversion light path arranged in the propagation direction of the first polarized blue light for generating wide-spectrum non-identical light based on the first polarized blue light, a non-coherent light path arranged in the propagation direction of the wide-spectrum non-identical light for modulating the wide-spectrum non-coherent light to generate modulated wide-spectrum light, and a wide-spectrum light illumination light path arranged in the propagation direction of the modulated wide-spectrum light for illuminating a first display screen and a second display screen based on the modulated wide-spectrum light, a coherent light path arranged in the propagation direction of the second polarized blue light for modulating the second polarized blue light to generate modulated blue light, and a blue light illumination light path arranged in the propagation direction of the modulated blue light for illuminating a blue display screen based on the modulated blue light. The light source light path system of the laser projector carries out separate modulation on coherent light and non-coherent light, wherein the non-coherent light path does not have PCS, thereby reducing the loss of polarization conversion efficiency and the loss of system expansion, and further improving the system efficiency.
Fig. 1 is a schematic block diagram of a first embodiment of a light source optical path system of a laser projector according to the present invention. As shown in fig. 1, the light source light path system of the laser projector of the present invention includes a blue light source A0 that emits blue light, a wide spectrum light illumination light path 70 that is disposed in a propagation direction of the blue light to split the blue light into first polarized blue light and second polarized blue light that propagate in different directions, a wavelength conversion light path 30 that is disposed in the propagation direction of the first polarized blue light to generate wide spectrum non-identical dimming based on the first polarized blue light, a non-coherent light path 40 that is disposed in the propagation direction of the wide spectrum non-identical dimming to modulate the wide spectrum non-coherent light to generate modulated wide spectrum light, and a wide spectrum light illumination light path 70 that is disposed in the propagation direction of the modulated wide spectrum light to illuminate a first display screen and a second display screen based on the modulated wide spectrum light, a coherent light path 50 that is disposed in the propagation direction of the second polarized blue light to modulate the second polarized blue light to generate modulated blue light, and a blue light illumination light path 60 that is disposed in the propagation direction of the modulated blue light to illuminate a display screen based on the modulated blue light.
In a preferred embodiment of the present invention, the polarization beam splitting optical path 20 includes a first phase delay element and a first beam splitter sequentially disposed in a propagation direction of the blue light. The blue light generates first polarized blue light and second polarized blue light through the first phase delay element, and the first spectroscope transmits the second polarized blue light and reflects the first polarized blue light. The positions of the first phase delay element and the first spectroscope may be set according to the position of the blue light source A0. Those skilled in the art can further arrange, for example, reflective, transmissive or refractive means as required to form different light paths having similar functions as described above. In a preferred embodiment of the invention, the first polarized blue light is S polarized light and the second polarized blue light is P polarized light.
In a preferred embodiment of the present invention, the wavelength conversion optical path 30 includes a first wavelength conversion element disposed in a reflected propagation direction of the first polarized blue light, the first wavelength conversion element converting the first polarized blue light into the wide-spectrum incoherent light and transmitting it back to the first beam splitter along the reflected propagation direction of the first polarized blue light and transmitted by the first beam splitter into the incoherent optical path 40. In a preferred embodiment of the invention, the first wavelength converting element converts the first polarized blue light into a broad spectrum light beam comprising a spectral range of red and green light to form the broad spectrum non-coherent light. And then back to the first beam splitter along the direction of reflection propagation of the first polarized blue light. The first beam splitter transmits the wide spectrum non-coherent light such that it enters the non-coherent light path 40. It is known to those skilled in the art that a plurality of optical beam expanding components, such as lens components, diffusion plates, etc., may be added to the wavelength conversion optical path 30, or a plurality of mirrors, etc., may be added according to the positions of the respective optical devices, thereby forming different optical paths having similar functions as described above.
In a preferred embodiment of the present invention, the non-coherent optical path 40 includes a compound eye component and a polarization conversion system (PCS, polerization Conversion System) component disposed in sequence in the propagation direction of the wide spectrum non-coherent light. Those skilled in the art will appreciate that any of the existing compound eye assemblies and PCS assemblies may be used, such as single, two or more compound eye assemblies, as well as any commercially available PCS assemblies. It is known to those skilled in the art that a plurality of optical beam expanding elements such as lens elements, diffusion plates, etc. may be added to the non-coherent optical path 40, or a plurality of mirrors, etc. may be added according to the positions of the respective optical elements, so as to form different optical paths having similar functions as described above.
In a preferred embodiment of the present invention, the broad spectrum light illumination light path 70 includes a second beam splitter, a first display screen, and a second display screen; the second beam splitter is disposed in a propagation direction of the modulated broad spectrum light to transmit a first color light of the modulated broad spectrum light from the second beam splitter to enter a first display screen and to reflect a second color light of the modulated broad spectrum light from the second beam splitter to enter a second display screen. In a preferred embodiment of the invention, the second beam splitter is a red light transmissive green light reflective beam splitter, and the first color light is red light and the first display is a red light display, the second color light is green light and the first display is a green light display. In another preferred embodiment of the invention, the second beam splitter is a beam splitter that reflects red light in the transmission of green light, and the first color light is green light and the first display is a green display, and the second color light is red light and the first display is a red display. It is known to those skilled in the art that a plurality of optical beam expanding components such as lens components, diffusion plates, etc. may be added to the wide spectrum illumination light path 70, or a plurality of mirrors, etc. may be added according to the positions of the respective optical devices, so as to form different light paths having similar functions as described above.
In a preferred embodiment of the present invention, the coherent optical path 50 is a PCS-free coherent optical path that does not include a PCS, and includes a second phase delay element and a compound eye assembly sequentially disposed in the propagation direction of the second polarized blue light. For example, the second polarized blue light is P polarized light, and after conversion by the second phase delay element, S polarized light is formed. In this way, it can be modulated by the compound eye assembly only. Because the S polarized light is co-polarized, the PCS modulation may not be employed. The same light is polarized light, and not the same light is unpolarized light. In the invention, coherent light and non-coherent light are divided into two light paths for separate modulation, wherein the coherent light path has no PCS, so that the loss of 25-35% is avoided. The efficiency is improved by 10% -15% as a whole. It is known to those skilled in the art that a plurality of optical beam expanding elements such as lens elements, diffusion plates, etc. may be added to the coherent optical path 50, or a plurality of mirrors, etc. may be added according to the positions of the respective optical elements, so as to form different optical paths having similar functions as described above.
In a preferred embodiment of the present invention, the blue light illumination path 60 includes a blue light display screen disposed in the propagation direction of the modulated blue light. It is known to those skilled in the art that a plurality of optical beam expanding components such as lens components, diffusion plates, etc. may be added to the blue light irradiation optical path 60, or a plurality of mirrors, etc. may be added according to the positions of the respective optical devices, so as to form different optical paths having similar functions as described above.
The light source light path system of the laser projector carries out separate modulation on coherent light and non-coherent light, wherein the non-coherent light path does not have PCS, thereby reducing the loss of polarization conversion efficiency and the loss of system expansion, and further improving the system efficiency. The same-modulation light and the non-same-modulation light are divided into two light paths for separate modulation, and the modulated light enters the system to illuminate the corresponding display screen respectively, wherein the same-modulation light paths do not have PCS, so that the loss of 25% -35% is avoided. The efficiency is improved by 10% -15% as a whole.
Fig. 2 is a light path diagram of a second embodiment of the light source light path system of the laser projector of the present invention. As shown in fig. 2, the light source light path system of the laser projector of the present invention includes a blue light source A0 that emits blue light, a wide spectrum light illumination light path 70 that is disposed in a propagation direction of the blue light to split the blue light into first polarized blue light and second polarized blue light that propagate in different directions, a wavelength conversion light path 30 that is disposed in the propagation direction of the first polarized blue light to generate wide spectrum non-identical dimming based on the first polarized blue light, a non-coherent light path 40 that is disposed in the propagation direction of the wide spectrum non-identical dimming to modulate the wide spectrum non-coherent light to generate modulated wide spectrum light, and a wide spectrum light illumination light path 70 that is disposed in the propagation direction of the modulated wide spectrum light to illuminate a first display screen and a second display screen based on the modulated wide spectrum light, a coherent light path 50 that is disposed in the propagation direction of the second polarized blue light to modulate the second polarized blue light to generate modulated blue light, and a blue light illumination light path 60 that is disposed in the propagation direction of the modulated blue light to illuminate a display screen based on the modulated blue light.
In this embodiment, the blue light source A0 is a blue laser light source, and emits a laser light having a polarization direction S, that is, S-polarized blue light B1. The blue light source A0 is horizontally disposed. The polarization beam splitting optical path 20 includes a first phase delay element A1 and a first spectroscope A2 sequentially disposed in the propagation direction of the S-polarized blue light in the horizontal direction. The first beam splitter A2 is designed to transmit P polarized light in the blue band and reflect S polarized light in both the green and red bands. Of course, in a preferred embodiment of the present invention, a lens assembly or other optical assembly may be provided between the blue light source A0 and the first phase delay element A1 to filter, expand, etc. the light beam. The first beam splitter A2 is disposed at an angle to the horizontal, preferably at an angle of 45 degrees. After passing through the bit-direction delay element A1, the S-polarized blue light B1 emitted by the blue light source A0 is split into P-polarized blue light and S-polarized blue light, and when it reaches the first spectroscope A2, the P-polarized blue light penetrates the first spectroscope A2 to form a second polarized blue light beam B3 propagating horizontally because the first spectroscope A2 is designed to reflect P-polarized light penetrating the S-polarized light in the blue light band, and the S-polarized blue light is reflected by the first spectroscope A2 to form a first polarized blue light beam B2 propagating downward in the vertical direction.
In the present embodiment, the wavelength conversion optical path 30 includes a first wavelength conversion element A3 disposed in a vertical propagation direction of the first polarized blue light beam B2, which can convert the first polarized blue light beam into a wide-spectrum yellow light beam including a spectrum range of red light and green light. The wide-spectrum yellow light beam propagates reversely and upwards along the vertical direction, so that the wide-spectrum yellow light beam passes through the first spectroscope A2 to form a wide-spectrum non-coherent light beam B4 because the first spectroscope A2 is designed to penetrate in the green light and red light frequency bands. In the preferred embodiment shown in fig. 2, the wavelength conversion optical path further includes a lens assembly and a diffusion plate disposed between the first wavelength conversion element A3 and the first dichroic mirror A2, the diffusion plate being disposed adjacent to the first dichroic mirror A2, the lens assembly being disposed adjacent to the first wavelength conversion element A3. Of course, in other preferred embodiments of the present invention, these components may be omitted, or other optics added to alter the optical path design.
In this embodiment, the non-coherent optical path includes a compound eye component A5 and a PCS component A6 sequentially disposed in a propagation direction of the wide-band non-coherent light. As shown in fig. 2, the wide-spectrum non-coherent light beam B4 propagates upward in the vertical direction after passing through the first beam splitter A2, and the compound eye component A5 and the PCS component A6 disposed in the vertical direction in parallel are modulated to form a modulated wide-spectrum light beam B5. In a preferred embodiment of the present invention, the compound eye assembly A5 may include two compound eyes disposed at a distance. The non-coherent optical path may further include a lens assembly disposed behind the PCS assembly A6 in a propagation direction of the wide-spectrum non-coherent optical beam B4.
In this embodiment, the broad spectrum light illumination light path includes a second beam splitter A8, a first display screen A9 and a second display screen a10, a first mirror F1 and a second mirror F2. In this embodiment, the second beam splitter A8 is a beam splitter that reflects the green light and transmits the red light, the first display screen A9 is a red light display screen, and the second display screen a10 is a green light display screen. It is known to those skilled in the art that the second beam splitter A8 may be configured as a beam splitter that reflects red light and transmits green light, the first display screen A9 is a green light display screen, and the second display screen a10 is a red light display screen.
The second beam splitter A8 is disposed at an angle to the vertical in the propagation direction of the modulated broad-spectrum light beam B5, preferably at an angle of 45 degrees. The modulated broad spectrum light beam B5 thus penetrates said second beam splitter A8 to form a red illumination beam B7 which is reflected by the first mirror F1 for illuminating the red display screen A9. Meanwhile, the modulated wide-spectrum light beam B5 is reflected by the second beam splitter A8 to form a green illumination light beam B8, and the green illumination light beam B8 is reflected by the second reflector F2 to illuminate the green display screen A10. Of course, the number of mirrors and their arrangement can be determined according to the position of the respective display screen, as known to those skilled in the art, who are able to arrange various functional circuits according to the teachings of the present invention, and will not be described here.
In this embodiment, the coherent optical path includes a second phase delay element A4 and a compound eye component A7 sequentially disposed in the propagation direction of the second polarized blue light beam B3. The blue light illumination light path includes a blue light display screen a11 disposed in a propagation direction of the modulated blue light. In the present embodiment, third and fourth reflecting mirrors F3 and F4 are further provided according to the setting position of the blue display screen a. In this embodiment, the second phase delay element A4 has a delay value of 1/2 wavelength. As shown in fig. 2, the horizontally transmitted second polarized blue light beam B3 is modulated by the second phase delay element A4, then is converted into S polarized light, and is reflected by the third reflector F3 to be transmitted upwards, modulated by the parallel compound eye component A7 to form a blue illumination beam B6, and then is reflected by the fourth reflector F4 to enter the blue display screen a11 for illumination. Of course, the number of mirrors and their arrangement can be determined according to the position of the respective display screen, as known to those skilled in the art, who are able to arrange various functional circuits according to the teachings of the present invention, and will not be described here.
The light source light path system of the laser projector carries out separate modulation on coherent light and non-coherent light, wherein the non-coherent light path does not have PCS, thereby reducing the loss of polarization conversion efficiency and the loss of system expansion, and further improving the system efficiency. The same-modulation light and the non-same-modulation light are divided into two light paths for separate modulation, and the modulated light enters the system to illuminate the corresponding display screen respectively, wherein the same-modulation light paths do not have PCS, so that the loss of 25% -35% is avoided. The efficiency is improved by 10% -15% as a whole.
Fig. 3 is a light path diagram of a third embodiment of the light source light path system of the laser projector of the present invention. As shown in fig. 3, the light source light path system of the laser projector of the present invention includes a blue light source A0 that emits blue light, a wide spectrum light illumination light path 70 that is disposed in a propagation direction of the blue light to split the blue light into first polarized blue light and second polarized blue light that propagate in different directions, a wavelength conversion light path 30 that is disposed in the propagation direction of the first polarized blue light to generate wide spectrum non-identical dimming based on the first polarized blue light, a non-coherent light path 40 that is disposed in the propagation direction of the wide spectrum non-identical dimming to modulate the wide spectrum non-coherent light to generate modulated wide spectrum light, and a wide spectrum light illumination light path 70 that is disposed in the propagation direction of the modulated wide spectrum light to illuminate a first display screen and a second display screen based on the modulated wide spectrum light, a coherent light path 50 that is disposed in the propagation direction of the second polarized blue light to modulate the second polarized blue light to generate modulated blue light, and a blue light illumination light path 60 that is disposed in the propagation direction of the modulated blue light to illuminate a display screen based on the modulated blue light.
In this embodiment, the blue light source A0 is a blue laser light source, and emits a laser light having a polarization direction S, that is, S-polarized blue light B1. The blue light source A0 is vertically disposed. The polarization beam splitting optical path 20 includes a first phase delay element A1 and a first spectroscope A2 disposed in order in the vertical direction in the propagation direction of the S-polarized blue light. The first beam splitter A2 is designed to transmit P polarized light in the blue band and reflect S polarized light in both the green and red bands. Of course, in a preferred embodiment of the present invention, a lens assembly or other optical assembly may be provided between the blue light source A0 and the first phase delay element A1 to filter, expand, etc. the light beam. The first beam splitter A2 is disposed at an angle to the horizontal, preferably at an angle of 45 degrees. After passing through the bit-direction delay element A1, the S-polarized blue light B1 emitted by the blue light source A0 is split into P-polarized blue light and S-polarized blue light, and when it reaches the first spectroscope A2, the P-polarized blue light penetrates the first spectroscope A2 to form a second polarized blue light beam B3 propagating downward in the vertical direction, and the S-polarized blue light is reflected by the first spectroscope A2 to form a first polarized blue light beam B2 propagating in the horizontal direction because the first spectroscope A2 is designed to be P-polarized to penetrate the S-polarized light reflection in the blue light band.
In the present embodiment, the wavelength conversion optical path 30 includes a first wavelength conversion element A3 disposed in the horizontal propagation direction of the first polarized blue light beam B2, which can convert the first polarized blue light beam into a wide-spectrum yellow light beam including the spectrum ranges of red light and green light. The wide-spectrum yellow light beam propagates upwards along the horizontal direction, so that the wide-spectrum yellow light beam passes through the first spectroscope A2, and the first spectroscope A2 is designed to penetrate in both the green light and red light bands, so that the wide-spectrum yellow light beam penetrates through the first spectroscope A2 to form a wide-spectrum non-coherent light beam B4. In the preferred embodiment shown in fig. 3, the wavelength conversion optical path further includes a lens assembly and a diffusion plate disposed between the first wavelength conversion element A3 and the first dichroic mirror A2, the diffusion plate being disposed adjacent to the first dichroic mirror A2, the lens assembly being disposed adjacent to the first wavelength conversion element A3. Of course, in other preferred embodiments of the present invention, these components may be omitted, or other optics added to alter the optical path design.
In this embodiment, the non-coherent optical path includes a compound eye component A5 and a PCS component A6 sequentially disposed in a propagation direction of the wide-band non-coherent light. As shown in fig. 3, the wide-spectrum non-coherent light beam B4 propagates in the horizontal direction after passing through the first beam splitter A2, and is modulated to form a modulated wide-spectrum light beam B5 by a compound eye component A5 and a PCS component A6 vertically disposed in the horizontal direction. In a preferred embodiment of the present invention, the compound eye assembly A5 may include two compound eyes disposed at a distance. The non-coherent optical path may further include a lens assembly disposed behind the PCS assembly A6 in a propagation direction of the wide-spectrum non-coherent optical beam B4.
In this embodiment, the broad spectrum light illumination light path includes a second beam splitter A8, a first display screen A9 and a second display screen a10, a first mirror F1 and a second mirror F2. In this embodiment, the second beam splitter A8 is a beam splitter that reflects the green light and transmits the red light, the first display screen A9 is a red light display screen, and the second display screen a10 is a green light display screen. It is known to those skilled in the art that the second beam splitter A8 may be configured as a beam splitter that reflects red light and transmits green light, the first display screen A9 is a green light display screen, and the second display screen a10 is a red light display screen.
The second beam splitter A8 is disposed at an angle to the horizontal in the propagation direction of the modulated wide-spectrum light beam B5, preferably at an angle of 45 degrees. The modulated broad spectrum light beam B5 thus penetrates said second beam splitter A8 to form a red illumination beam B7 which is reflected by the first mirror F1 for illuminating the red display screen A9. Meanwhile, the modulated wide-spectrum light beam B5 is reflected by the second beam splitter A8 to form a green illumination light beam B8, and the green illumination light beam B8 is reflected by the second reflector F2 to illuminate the green display screen A10. Of course, the number of mirrors and their arrangement can be determined according to the position of the respective display screen, as known to those skilled in the art, who are able to arrange various functional circuits according to the teachings of the present invention, and will not be described here.
In this embodiment, the coherent optical path includes a second phase delay element A4 and a compound eye component A7 sequentially disposed in the propagation direction of the second polarized blue light beam B3. The blue light illumination light path includes a blue light display screen a11 disposed in a propagation direction of the modulated blue light. In the present embodiment, third to fifth reflecting mirrors F3 to F5 are further provided according to the setting position of the blue display screen a. In this embodiment, the second phase delay element A4 has a delay value of 1/2 wavelength. As shown in fig. 3, the horizontally transmitted second polarized blue light beam B3 is modulated by the second phase delay element A4, is converted into S polarized light, is reflected by the third mirror F3 to propagate in the horizontal direction, is modulated by the compound eye component A7 vertically arranged in the horizontal direction to form a blue illumination beam B6, and is reflected by the fourth mirror F4 and the fifth mirror F5 to enter the blue display screen a11 for illumination. Of course, the number of mirrors and their arrangement can be determined according to the position of the respective display screen, as known to those skilled in the art, who are able to arrange various functional circuits according to the teachings of the present invention, and will not be described here. Those skilled in the art will appreciate that in other preferred embodiments of the present invention, a lens assembly may also be provided between the fourth mirror F4 and the fifth mirror F5.
The light source light path system of the laser projector carries out separate modulation on coherent light and non-coherent light, wherein the non-coherent light path does not have PCS, thereby reducing the loss of polarization conversion efficiency and the loss of system expansion, and further improving the system efficiency. The same-modulation light and the non-same-modulation light are divided into two light paths for separate modulation, and the modulated light enters the system to illuminate the corresponding display screen respectively, wherein the same-modulation light paths do not have PCS, so that the loss of 25% -35% is avoided. The efficiency is improved by 10% -15% as a whole.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (8)
1. A light source optical path system of a laser projector, characterized by comprising a blue light source emitting blue light, a polarization splitting optical path arranged in a propagation direction of the blue light to split the blue light into first polarized blue light and second polarized blue light propagating in different directions, a wavelength conversion optical path arranged in the propagation direction of the first polarized blue light to generate wide-spectrum non-identical dimming based on the first polarized blue light, a non-coherent optical path arranged in the propagation direction of the wide-spectrum non-identical dimming to modulate the wide-spectrum non-coherent light to generate modulated wide-spectrum light, and a wide-spectrum light illumination optical path arranged in the propagation direction of the modulated wide-spectrum light to illuminate a first display screen and a second display screen based on the modulated wide-spectrum light, a coherent optical path arranged in the propagation direction of the second polarized blue light to modulate the second polarized blue light to generate modulated blue light, and a blue light illumination optical path arranged in the propagation direction of the modulated blue light to illuminate a blue display screen based on the modulated blue light; the coherent light path is a PCS-free coherent light path and comprises a second phase delay element and a compound eye component which are sequentially arranged in the propagation direction of the second polarized blue light; the non-coherent light path comprises a compound eye component and a PCS component which are sequentially arranged in the propagation direction of the wide-frequency non-coherent light.
2. The light path system of claim 1, wherein the polarization beam splitting light path comprises a first phase delay element and a first beam splitter disposed in sequence in a propagation direction of the blue light, the blue light generating a first polarized blue light and a second polarized blue light through the first phase delay element, the first beam splitter transmitting the second polarized blue light and reflecting the first polarized blue light.
3. The laser projector light source optical path system of claim 2 wherein the wavelength conversion optical path includes a first wavelength conversion element disposed in a reflected propagation direction of the first polarized blue light, the first wavelength conversion element converting the first polarized blue light into the broad spectrum non-coherent light and transmitting it back to the first beam splitter along the reflected propagation direction of the first polarized blue light and transmitted by the first beam splitter into the non-coherent optical path.
4. A laser projector light source light path system as set forth in claim 3, wherein the wavelength conversion light path further comprises a lens assembly and a diffuser plate disposed between the first wavelength conversion element and the first beam splitter, the diffuser plate disposed proximate the first beam splitter, the lens assembly disposed proximate the first wavelength conversion element.
5. The laser projector light source light path system of claim 1, wherein the broad spectrum light illumination light path comprises a second beam splitter, a first display screen, and a second display screen; the second beam splitter is disposed in a propagation direction of the modulated broad spectrum light to transmit a first color light of the modulated broad spectrum light from the second beam splitter to enter a first display screen and to reflect a second color light of the modulated broad spectrum light from the second beam splitter to enter a second display screen.
6. The laser projector light source optical path system of claim 5, wherein the broad spectrum light illumination optical path further comprises a first mirror and a second mirror, the first mirror being angled in a direction of propagation of the first color light, the first display screen being angled in a direction of reflection of the first color light, the second mirror being angled in a direction of propagation of the second color light, the second display screen being angled in a direction of reflection of the second color light.
7. The laser projector light source optical path system of claim 1, wherein the coherent optical path further comprises a third mirror disposed at an angle after the second phase delay element in a propagation direction of the second polarized blue light, the compound eye assembly being disposed in a reflection direction of the second polarized blue light.
8. The laser projector light source light path system of claim 1, wherein the blue light illumination light path comprises a blue light display screen disposed in a propagation direction of the modulated blue light.
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| CN111007690A (en) * | 2019-12-13 | 2020-04-14 | 深圳彩翼光电科技有限公司 | 3LCD projector laser lighting system and 3LCD projector |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2621303Y (en) * | 2003-06-18 | 2004-06-23 | 北京电影机械研究所 | Optical engine for liquid crystal projector |
| CN105824177A (en) * | 2015-01-09 | 2016-08-03 | 深圳市绎立锐光科技开发有限公司 | Liquid crystal on silicon projection system |
| CN105988268A (en) * | 2015-01-27 | 2016-10-05 | 深圳市绎立锐光科技开发有限公司 | Projection imaging system |
| WO2018025351A1 (en) * | 2016-08-03 | 2018-02-08 | Ｎｅｃディスプレイソリューションズ株式会社 | Projector |
| CN209167798U (en) * | 2018-12-27 | 2019-07-26 | 深圳彩翼光电科技有限公司 | Laser projection light source optical path system |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008040116A (en) * | 2006-08-04 | 2008-02-21 | Olympus Corp | Image display device |
| JP6743598B2 (en) * | 2016-09-07 | 2020-08-19 | 株式会社Ｊｖｃケンウッド | Projection type image display device |
-
2018
- 2018-12-27 CN CN201811610352.3A patent/CN109459908B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2621303Y (en) * | 2003-06-18 | 2004-06-23 | 北京电影机械研究所 | Optical engine for liquid crystal projector |
| CN105824177A (en) * | 2015-01-09 | 2016-08-03 | 深圳市绎立锐光科技开发有限公司 | Liquid crystal on silicon projection system |
| CN105988268A (en) * | 2015-01-27 | 2016-10-05 | 深圳市绎立锐光科技开发有限公司 | Projection imaging system |
| WO2018025351A1 (en) * | 2016-08-03 | 2018-02-08 | Ｎｅｃディスプレイソリューションズ株式会社 | Projector |
| CN209167798U (en) * | 2018-12-27 | 2019-07-26 | 深圳彩翼光电科技有限公司 | Laser projection light source optical path system |
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