Miniature LCOS projection illumination system with double laser light sources

Abstract

The invention provides a miniature LCOS projection illumination system with double laser light sources, and belongs to the technical field of miniature laser projection display. The device comprises a light source module, a modulation module and a lens module which are sequentially connected, the light source module comprises a three-primary-color laser and a red laser, the three-primary-color laser and the red laser are located on the same side of the lens module and are parallel to the central axis of the lens module, and a red light source in the three-primary-color laser is opposite to the red laser. A blue light source and a green light source of the three-primary-color laser device are not coaxial with a light path of the red laser device, red light of the three-primary-color laser device and red light of the red laser device are modulated by the half-wave plate and reflected by the dichroic mirror in sequence, and blue light and green light of the three-primary-color laser device pass through the spectroscope and the first reflector in sequence. The two paths of blue light and green light are combined with the two paths of red light respectively to form two paths of three-color laser. The invention has the advantages of miniaturization, high brightness, high color saturation and high contrast.

Description

Technical Field

[0001] The present invention belongs to the technical field of micro laser projection display, and in particular relates to a dual-laser light source LCOS projection lighting system. Background Art

[0002] There are various types of projection products on the market, and the mainstream projection technologies mainly use LCD technology, DLP technology, and LCOS technology. The common projection types on the market are LCD and DLP. As users' requirements for product brightness, color saturation, and contrast continue to increase, the color experience brought by existing projection technology to the human eye can no longer meet the needs of high-quality life. Therefore, LCOS projections are gradually coming into the public eye and are becoming more and more popular among consumers.

[0003] For the LCOS projection system, the common micro-LED LCOS projectors on the market usually use a single LCOS chip, which is combined with an LED light source through timing control to synthesize a color image, and then emit an image through a lens. The LED light source has a large divergence angle, and the light utilization efficiency is generally low. The brightness is relatively limited compared to the laser light source, and the life span is much lower than that of the laser light source. The current mainstream laser light source projectors usually use a blue laser light source with a fluorescent wheel color wheel. The laser light source emits a laser beam with good color, wide color gamut, and high brightness, but the components required for the fluorescent wheel laser projector are relatively large, making it difficult to balance the brightness and volume, and do not meet the market demand for miniaturized projection.

[0004] Therefore, how to meet the requirements of miniaturization, high brightness, high color saturation and high contrast in the laser solution LCOS projection system has become one of the technical problems that technicians in this field need to solve urgently. Summary of the invention

[0005] In view of this, the technical problem to be solved by the present invention is to provide a dual-laser light source micro LCOS projection illumination system, which has the advantages of miniaturization, high brightness, high color saturation and high contrast.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: a dual-laser light source micro LCOS projection lighting system, comprising a light source module, a modulation module and a lens module connected in sequence, the light source module comprising a three-primary color laser and a red laser, the three-primary color laser and the red laser are located on the same side of the lens module and are respectively parallel to the central axis of the lens module, the red light source in the three-primary color laser is opposite to the red laser, and the optical path is coaxial, the blue light source and the green light source of the three-primary color laser are not coaxial with the optical path of the red laser, the red light of the three-primary color laser and the red laser are modulated by a half-wave plate and reflected by a dichroic mirror in sequence, and are emitted as two parallel red lights, the blue and green lights of the three-primary color laser are sequentially passed through a beam splitter and a first reflector, and are emitted as two parallel blue and green lights, the two blue and green lights are respectively combined with the two red lights to form two three-color lasers, and the two three-color lasers are guided to the lens module through the modulation module.

[0007] Optionally, there are two half-wave plates, which are respectively arranged at the red light source of the three-primary color laser and the light output side of the red laser, and the half-wave plates are respectively arranged in parallel with the three-primary color laser and the red laser.

[0008] Optionally, there are two dichroic mirrors, which are respectively arranged on one side of the two half-wave plates away from the light source, and the dichroic mirrors are arranged obliquely with the half-wave plates located in the same optical path.

[0009] Optionally, the dichroic mirrors are arranged at 45° to the half-wave plates located in the same optical path.

[0010] Optionally, the arrangement direction of the beam splitter is parallel to the dichroic mirror of the three-primary color laser, the arrangement direction of the beam splitter is parallel to the first reflector, and the arrangement direction of the first reflector is perpendicular to the dichroic mirror of the red light laser.

[0011] Optionally, the modulation module includes a diffuser, a first fly-eye lens group, a second fly-eye lens group, a second reflector, a metal wire grid, a delay plate, an LCOS chip and an analyzer, the first fly-eye lens group includes a first fly-eye lens, a first lens and a second lens, the second fly-eye lens group includes a second fly-eye lens, a third lens and a fourth lens, and the diffuser, the first fly-eye lens, the first lens, the second lens, the second fly-eye lens, the second reflector, the third lens, the fourth lens, the metal wire grid, the delay plate, the LCOS chip and the analyzer are arranged in sequence on the incident light axis.

[0012] Optionally, the arrangement direction of the diffuser, the first fly-eye lens, the first lens, the second lens, the second fly-eye lens, the third lens, the fourth lens, the delay plate, the LCOS chip and the polarizer is perpendicular to the incident light axis, and the arrangement directions of the second reflector and the metal wire grid are respectively inclined to the incident light axis.

[0013] Optionally, the arrangement directions of the second reflector and the metal wire grid are respectively 45° to the incident light axis.

[0014] Optionally, the arrangement direction of the diffuser, the first fly-eye lens, the first lens, the second lens, the second fly-eye lens and the analyzer is perpendicular to the central axis of the lens, and the arrangement direction of the third lens, the fourth lens, the delay plate and the LCOS chip is parallel to the central axis of the lens module.

[0015] Optionally, the lens module includes a pixel dither and an imaging lens, and the pixel dither is arranged between the modulation module and the imaging lens.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a solution for a dual-laser light source LCOS projection lighting system, which includes a light source module, a modulation module and a lens module. The overall U-shaped structure is adopted, and the lens module is parallel to the dual-laser light source module. The length dimension is compressed without increasing the height direction. The arrangement directions of multiple optical lenses of the three primary color light source light paths in the light source module are parallel, and the arrangement directions of multiple optical lenses of the red light source are vertical. After the blue-green light path is split by a first beam splitter, the two groups of light source laser beams are combined into one group; the modulation module uses a single LCOS chip to realize the debugging of the two groups of laser beams of the laser, and the light homogenization component thereof is arranged in a vertical direction by a second reflector, and the arrangement direction of the light splitting component is parallel to the arrangement direction of the second compound eye lens group, and only one group of adjustment reflectors is used, so that the length and width dimensions of the U-shaped structure are compressed to the limit, the overall lighting group has high optical efficiency, high space utilization, and few assembly and adjustment links, and the volume of the entire laser projection lighting system is small, meeting the miniaturization requirements.

[0017] The projection lighting system of the present invention adopts a group of three-primary color light sources and a group of red lasers to meet the balance of color, brightness, contrast, price and other aspects. The blue and green light are split by a beam splitter, so that the light beams are transmitted along two light paths respectively, ensuring that the laser beams of the two light sources contain three light beams of red, green and blue, ensuring the imaging size and optical efficiency, and meeting the requirements of high brightness, high color saturation and high contrast.

[0018] The projection illumination system of the present invention also adjusts the light field by adjusting the lens coupling in the modulation module instead of the reflector, thereby reducing the cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a schematic structural diagram of a dual-laser light source micro LCOS projection illumination system provided by an embodiment of the present invention; Figure 2 is a schematic diagram of the arrangement of a modulation module and a lens module provided in an embodiment of the present invention; Figure 3 It is a schematic structural diagram of another dual-laser light source micro LCOS projection illumination system provided by an embodiment of the present invention; Figure 4 yes Figure 3 The schematic diagram of the arrangement of the modulation module and the lens module is shown; Figure 5 is a structural schematic diagram of a light source module provided by an embodiment of the present invention; Figure 6 It is a simulation diagram of the radiant illumination of the LCOS surface in the present invention; Figure 7 is the TracePro angle distribution diagram of the LCOS surface in the present invention; Among them, 100, light source module; 101, three-primary color laser; 102, red laser; 103a, 103b, half-wave plate; 104a, 104b, dichroic mirror; 105, beam splitter; 106, first reflector; 200, modulation module; 201, diffuser; 202, first fly-eye lens; 203, first lens; 204, second lens; 205, second fly-eye lens; 206, second reflector; 207, third lens; 208, fourth lens; 209, metal wire grid; 210, delay plate; 211, LCOS chip; 212, analyzer; 300, lens module; 301, pixel dither; 302, imaging lens. DETAILED DESCRIPTION

[0021] In order to better understand the present invention, the content of the present invention is further clearly set forth in conjunction with the embodiments below, but the protection content of the present invention is not limited to the following embodiments. In the following description, a large number of specific details are provided in order to provide a more thorough understanding of the present invention. However, it is obvious to those skilled in the art that the present invention can be implemented without one or more of these details.

[0022] The terms "including" and "having" are used to express an open-ended inclusive meaning and mean that additional elements / components / etc. may exist in addition to the listed elements / components / etc.; the terms "first", "second" and "third", etc. are used merely as labels and are not intended to limit the quantity of their objects.

[0023] In the present invention, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium.

[0024] Unless otherwise specifically stated, the relative arrangement of the components and steps, numerical expressions and numerical values ​​described in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The techniques, methods and devices known to ordinary technicians in the relevant fields may not be discussed in detail, but where appropriate, the techniques, methods and devices should be considered as part of the authorized specification.

[0025] Please refer to Figure 1-5 An embodiment of the present invention provides a dual-laser light source LCOS projection lighting system, which includes: a light source module 100, a modulation module 200 and a lens module 300. In the illustrated case, the light source module, the modulation module and the lens module are connected in sequence to form a U-shaped structure.

[0026] Please refer to Figure 5 The light source module 100 of the dual-laser light source LCOS projection illumination system includes: a three-primary color laser 101, a red laser 102, a half-wave plate 103a (103b), a dichroic mirror 104a (104b), a beam splitter 105 and a first reflector 106. The three-primary-color laser 101 and the red laser 102 are located on the same side of the lens module 300 and are parallel to the central axis of the lens module 300 respectively. The red light source in the three-primary-color laser 101 is opposite to the red laser 102 and has a coaxial optical path. The blue light source and the green light source of the three-primary-color laser 101 are not coaxial with the optical path of the red laser 102. The red light of the three-primary-color laser 101 and the red laser 102 are modulated by the half-wave plate 103a (103b) and reflected by the dichroic mirror 104a (104b) in turn, and are emitted as two parallel red lights. The blue and green lights of the three-primary-color laser 101 are sequentially passed through the beam splitter 105 and the first reflector 106, and are emitted as two parallel blue and green lights. The two blue and green lights are respectively combined with the two red lights to form two three-color lasers. The two three-color lasers are guided to the lens module 300 through the modulation module 200. The above-mentioned blue light and green light are abbreviations of blue light and green light. In this solution, the blue light and green light emitted from the three-primary color laser 101 are regarded as one light.

[0027] Among them, the half-wave plate includes two groups of half-wave plates 103a and 103b of the same specifications, and the dichroic mirror includes two groups of dichroic mirrors 104a and 104b of the same specifications. The three-primary color laser 101 and the red laser 102 are arranged in parallel, and the red paths are aligned. The half-wave plate 103a is located on the light-emitting side of the three-primary color laser 101, and the half-wave plate 103b is located on the light-emitting side of the red laser 102. The half-wave plate 103a is parallel to the arrangement direction of the three-primary color laser 101 and forms a 45° angle with the dichroic mirror 104a. The beam splitter 105 and the dichroic mirror 104a are arranged in parallel in the horizontal direction. The first reflector 106 is arranged in parallel with the beam splitter 105. The half-wave plate 103b is parallel to the arrangement direction of the red laser 102 and forms a 45° angle with the dichroic mirror 104b.

[0028] The three-primary-color laser 101 can emit three-color laser beams, and the red laser 102 can emit a red laser beam. The light source module 100 uses the above components to combine the three-color laser beams with a single red laser beam and then guide them to the modulation module 200 .

[0029] For example, the three colors of lasers include: red laser, green laser and blue laser. It should be noted that the embodiments of the present invention are schematically described by taking the example that the three-primary color laser 101 emits three colors of lasers, namely red laser, green laser and blue laser, and the red laser 102 emits red laser.

[0030] Please refer to Figure 5The three-primary-color laser 101 emits a red laser to the half-wave plate 103a, and emits a red laser to the dichroic mirror 104a, and the dichroic mirror 104a is used to reflect the red laser to the diffuser 201. The red laser 102 emits a red laser to the half-wave plate 103b, and emits a red laser to the dichroic mirror 104b, and the dichroic mirror 104b reflects the red laser to the diffuser 201. The three-primary-color laser 101 emits a blue laser and a green laser to the beam splitter 105, and the beam splitter 105 reflects half of the blue laser and the green laser to the dichroic mirror 104a, and transmits the remaining half of the blue laser and the green laser through the first reflecting mirror 106. The first reflecting mirror 106 reflects the blue laser and the green laser to the dichroic mirror 104b. The dichroic mirror 104a (104b) is a dichroic plate that reflects the red laser and transmits the blue-green laser. In this case, the polarization polarity of the blue laser and the green laser emitted by the three-primary color laser 101 is opposite to that of the red laser. The blue laser and the green laser are S-polarized light, and the red laser is P-polarized light. The half-wave plate 103a (103b) is a polarization conversion component, which can be used to convert the incident red laser from P-polarized light to S-polarized light, and then emit it to the dichroic mirror 104a (104b), so that the polarization direction of the blue laser and the green laser incident on the dichroic mirror 104 is the same as that of the red laser. As a result, the red, green, and blue lasers are uniformly polarized to form a projection image, which can avoid the problem of image distortion or lack of a certain color due to the different transmission and reflection efficiency of optical lenses for different polarized light.

[0031] Please refer to Figure 1 and Figure 3The modulation module 200 of the dual laser light source LCOS projection illumination system includes: a diffuser 201, a first fly-eye lens 202, a first lens 203, a second lens 204, a second fly-eye lens 205, a second reflector 206, a third lens 207, a fourth lens 208, a metal wire grid 209, a delay plate 210, an LCOS chip 211, and an analyzer 212. The diffuser 201 diffuses the point-shaped laser beam, the first fly-eye lens 202 is horizontally parallel to the diffuser 201, the first fly-eye lens 202 focuses the incident laser beam through the first surface fly-eye sub-unit fine beam into the second surface fly-eye lens, and the outgoing beam forms a uniform hexagonal light spot, the first fly-eye lens 202 is parallel to the first lens 203 and the second lens 204, the first lens 203 and the second lens 204 image the first fly-eye lens on the second fly-eye lens 205, so that the second fly-eye lens 205 is incident with a uniform hexagonal light spot. Behind the second lens 204 is the second fly-eye lens 205. The second reflector 206 forms an angle of 45° with the second fly-eye lens 205. The second reflector 206 can adjust the light field. The second reflector 206 folds the light path and plays a role in coupling the main light synchronously to ensure that the light path does not deviate. The third lens 207 and the fourth lens 208 are perpendicular to the multiple groups of lenses in front of the second reflector 206. The third lens 207 and the fourth lens 208 image the second fly-eye lens 205 on the LCOS chip 211, so that the LCOS chip 211 is incident with a uniform rectangular light spot. The metal wire grid 209 forms an angle of 45° with the fourth lens 208. The metal wire grid 209 transmits P light and reflects S light. The LCOS chip 211 can modulate the laser beam after homogenization. In the invention, the LCOS chip 211 used in the optical illumination system is a single-chip LCOS. The incident P-polarized light is irradiated onto the LCOS chip 211 through the metal wire grid 209 and the delay plate 210. The input P-polarized light is deflected in the polarization direction of the liquid crystal layer, and the S-polarized light is output. After the polarization is purified by the delay plate 210, it is reflected by the metal wire grid 209 into the analyzer 212. The analyzer 212 modulates the S light, so that the laser beam is imaged through the lens module 300.

[0032] In an embodiment of the present invention, the modulation module 200 includes a diffuser 201, which can homogenize the incident laser beam and then direct it to the first fly-eye lens module. The first fly-eye lens group in the modulation module 200 includes: a first fly-eye lens 202, a first lens 203, and a second lens 204, which play the role of homogenizing the laser beam and optimizing the light spot. The modulation principle of the first fly-eye lens group is that the first fly-eye lens 202 is made of glass, and an anti-laser threshold film is coated on the surface. A plurality of sub-fly-eye lenses are arranged in arrays on the light incident surface and the light exiting surface of the glass substrate, respectively. The plurality of sub-fly-eye lenses on the light incident surface and the plurality of sub-fly-eye lenses on the light exiting surface correspond to each other one by one. The shape and size of each sub-fly-eye lens are the same as those of the corresponding sub-fly-eye lens, and the curvature is opposite. The incident light beam falls on the focal plane of the sub-fly-eye lens on the light exiting surface. In this example, the plurality of sub-fly-eye lenses on the light incident surface and the plurality of sub-fly-eye lenses on the light exiting surface are spherical convex lenses. The multiple sub-fly-eye lenses on the light incident surface divide the red, green and blue laser spots, and accumulate the spots on the light exiting surface to achieve preliminary homogenization of the laser light beams, so as to achieve homogenization of the laser beams emitted by the three-primary color laser 101 and the red laser 102.

[0033] like Figure 1 and Figure 3 As shown, the first lens 203 and the second lens 204 are identical biconvex spherical lenses, and the entire lens group can converge the laser beam emitted by the first fly-eye lens 202 and capture it on the incident surface of the second fly-eye lens 205. The first lens 203 and the second lens 204 in the embodiment of the present invention have a curvature radius R and a thickness T. The units of the curvature radius R and the thickness T are both millimeters (mm).

[0034] Table 1 Curvature radius R and thickness T of the first lens and the second lens As shown in Table 1, the value of the radius of curvature of the light incident surface S1 of the first lens 203 is 85.061, the value of the radius of curvature of the light emitting surface S1 of the first lens 203 is -85.061, the value of the center thickness of the first lens 203 is 3 mm, the value of the radius of curvature of the light incident surface S1 of the second lens 204 is 85.061, the value of the radius of curvature of the light emitting surface S1 of the second lens 204 is -85.061, and the value of the center thickness of the second lens 204 is 3 mm.

[0035] In an embodiment of the present invention, the second fly-eye lens group in the modulation module 200 includes: a second fly-eye lens 205, a third lens 207, and a fourth lens 208, which again play the role of homogenizing the laser beam emitted by the first fly-eye lens group and optimizing the light spot. The adjustment principle of the second fly-eye lens group is basically the same as the modulation principle of the first fly-eye lens, and will not be repeated. In this example, the multiple sub-fly-eye lenses on the light incident surface and the multiple sub-fly-eye lenses on the light exit surface are spherical convex lenses. The multiple sub-fly-eye lenses on the light incident surface divide the red, green, and blue laser spots, accumulate the spots on the light exit surface, and achieve preliminary homogenization of the hexagonal spots, so as to achieve homogenization of the laser beam emitted by the first fly-eye lens group.

[0036] like Figure 1 and Figure 3 As shown, the third lens 207 is a double-sided spherical convex lens, and the fourth lens 208 is a plano-convex spherical lens. The entire lens group can converge the laser beam emitted by the second fly-eye lens 205 and absorb it into the LCOS chip 211. It should be noted that the embodiments of the present invention are schematically illustrated using the modulation module 200 as an example. In order to improve the modulation efficiency of the LCOS chip for the laser beam, it is usually necessary to ensure that the long side of the spot of the laser beam incident on the LCOS chip 211 after the second fly-eye lens group is adjusted corresponds to the long side of the LCOS chip 211, and the short side of the spot of the laser beam corresponds to the short side of the LCOS chip 211. The radius of curvature R and thickness T of the third lens 207 and the fourth lens 208 in one embodiment of the present invention. The units of the radius of curvature R and the thickness T are both millimeters (mm).

[0037] Table 2 Curvature radius R and thickness T of the third lens and the fourth lens As shown in Table 2, the value of the radius of curvature of the light incident surface S1 of the third lens 207 is 76.927, the value of the radius of curvature of the light emitting surface S1 of the third lens 207 is -76.927, the value of the center thickness of the third lens 207 is 5 mm, the value of the radius of curvature of the light incident surface S1 of the fourth lens 208 is 30.031, the value of the radius of curvature of the light emitting surface S1 of the fourth lens 208 is infinity, and the value of the center thickness of the fourth lens 208 is 5 mm.

[0038] Please refer to Figure 1 and Figure 3 The lens module 300 of the dual laser light source LCOS projection illumination system includes a pixel dither 301 and an imaging lens 302, which can be used to project the laser beam modulated by the modulation module 200 for imaging.

[0039] In the embodiment of the present invention, a space is reserved between the lens module 300 and the modulation module 200, and a gasket (not shown in the figure) is added to adapt the back focus of the projection lens, so that the display effect of the image projected by the projection lens is better. It should be noted that the gasket can be pre-set or not, and the embodiment of the present invention does not make specific limitations on this.

[0040] In summary, an embodiment of the present invention provides a dual-laser light source LCOS projection lighting system, which includes: a light source module, a modulation module and a lens; the light source module uses a group of three-primary color light sources and a group of red lasers to meet the balance of color, brightness, contrast, price and other aspects. In the existing optical lighting system that only uses a single LCOS chip to modulate the laser beam, the number of other optical devices used in conjunction with it is large, and it is difficult to compress the volume. The present invention optimizes the dual laser light source arrangement scheme, compresses the height dimension without increasing the height direction, and only uses a group of reflectors to achieve a "U-shaped" architecture to ensure that the length and width dimensions are compressed to the limit, so that the arrangement of the dual laser light source module, the modulation module and the lens module is more compact, and the length, width and height dimensions of the arrangement are relatively small, ensuring that the projection lighting system architecture is smaller and meeting the miniaturization requirements.

[0041] The value of the aperture F# of the optical illumination system of the present invention is 2.3. Figure 7 , the TracePro angle distribution diagram shows that the LCOS surface angle is 12.26°, and the lens aperture F# value can be less than 2.2. Among them, a smaller F# value means that the system has a larger aperture, allowing more light to pass through. In an optical system, the square of F# is inversely proportional to the luminous flux. A smaller F# value means that the optical system has a larger luminous flux, which can transmit more light energy and reduce the loss of luminous flux in the system. The lighting system is paired with a lens with a small F#, which reduces the loss of brightness projected on the screen, helping to improve the brightness and quality of the image.

[0042] The overall structure of the optical lighting system of the present invention adopts a U-shaped structure. Based on the size of the lens, the length direction is compressed to the limit and the height direction does not exceed the maximum size of the component, thus meeting the requirements of miniaturization. Figure 6 As shown in the figure, the utilization rate of the light source from the light source to the LCOS surface can reach 83%, and the brightness loss of the entire architecture is small, meeting the high brightness requirements. This system adds a red light to the original three-color laser. The red color accounts for a large proportion of the entire system to meet the high color saturation. The red field color coordinates are measured (0.70, 0.28), and the color gamut meets BT2020, which has the advantage of high color saturation. The delay plate and the analyzer work together to purify the laser, and the contrast is measured to meet 4000:1, which has the advantage of high contrast.

[0043] There are many possible implementation methods for the architecture of the laser projection device in the embodiment of the present invention. The embodiment of the present invention will be schematically described with the following two optional implementation methods: For the first optional lighting architecture, please refer to Figure 2 , Figure 2 Schematic diagram of the arrangement of an optical illumination system and a projection lens provided by an embodiment of the present invention. The arrangement direction of the lens module and the LCOS chip 211 behind the second reflector 206 in the modulation module 200 is perpendicular to the arrangement direction of the lens module 300 in the Y direction. And the light-emitting surface of the LCOS chip 211 faces the lens module behind the second reflector 206. For example, the arrangement direction of the lens module in front of the second reflector 206 and the lens module 300 is parallel to the X-axis direction shown in the figure, and the lens group in the modulation module 200 reflects the laser beam to the LCOS chip 211, and transmits the laser beam modulated by the LCOS chip 211 to the lens module 300 for imaging. In this case, since the arrangement direction of the light source module and the lens group and the lens module 300 in front of the second reflector 206 is parallel to the X-axis direction shown in the figure, the lens module and the LCOS chip 211 behind the second reflector 206 are arranged perpendicular to the lens module 300 in the Y direction. In this way, it can be ensured that the entire projection illumination system is compressed to the limit in the height direction and the overall volume is kept small, so that the projection illumination system can project images normally.

[0044] For the second optional lighting architecture, please refer to Figure 4 , Figure 4 It is a schematic diagram of the arrangement of an optical illumination system and a projection lens provided by an embodiment of the present invention. The arrangement direction of the lens module and the LCOS chip 211 behind the second reflector 206 in the modulation module 200 is perpendicular to the arrangement of the lens module 300 in the Z direction. And the light-emitting surface of the LCOS chip 211 faces the lens module behind the second reflector 206. For example, the arrangement direction of the lens module and the lens module 300 in front of the second reflector 206 is parallel to the Y-axis direction shown in the figure, and the lens group in the modulation module 200 reflects the laser beam to the LCOS chip 211, and transmits the laser beam modulated by the LCOSLCOS chip 211 to the lens module 300 for imaging. In this case, since the arrangement direction of the light source module and the lens module and the lens module 300 in front of the second reflector 206 is parallel to the Y-axis direction shown in the figure, the lens module and the LCOS chip 211 behind the second reflector 206 are arranged perpendicular to the lens module 300 in the Z direction. In this way, it can be ensured that the entire projection illumination system is compressed to the limit in the horizontal width direction and the overall volume is kept small, so that the projection illumination system can project images normally.

[0045] The embodiment of the present invention provides two stacking methods to satisfy parallel placement and three-dimensional placement of the entire machine, but the specific implementation is not limited thereto.

[0046] It can be seen that the dual laser light source LCOS projection illumination system of the present invention has the following advantages: 1. It can meet the requirements of miniaturization, high brightness, high color saturation and high contrast; 2. Compress the size of the entire lighting system to the extreme to better meet the needs of miniaturization; 3. By placing the dual laser light sources in parallel, the height dimension is compressed without increasing the height dimension; 4. Split the blue and green light through the first beam splitter, so that the light beams pass through the two optical paths respectively, ensuring that the two light source laser beams contain three types of light beams, namely red, green and blue, to ensure the imaging size and optical efficiency and meet the color requirements; 5. Adjust the lens coupling in the modulation module to replace the reflector to adjust the light field and reduce costs; 6. Only one set of second reflectors is used to reduce the width of the entire optical path; 7. The metal wire grid in the modulation module transmits S light to the received projection beam while reflecting P light to the received projection beam, replacing the prism. The lighting system is simpler, which is conducive to further optimization of the subsequent optical body design, coupled with a delay plate, and meets the high contrast requirements at the same time; 8. The U-shaped structure is adopted, based on the lens size, to ensure that the length direction is compressed to the limit to meet the requirements of miniaturization.

[0047] In addition, those skilled in the art should understand that, although there are many problems in the prior art, each embodiment or technical solution of the present invention can be improved in only one or several aspects, without having to solve all the technical problems listed in the prior art or background technology at the same time. Those skilled in the art should understand that the content not mentioned in a claim should not be used as a limitation on the claim.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Other modifications or equivalent substitutions made to the technical solution of the present invention by ordinary technicians in the field should be included in the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solution of the present invention.

Claims

1. A dual laser light source micro LCOS projection illumination system, characterized in that: The invention comprises a light source module, a modulation module and a lens module which are connected in sequence. The light source module comprises a three-primary color laser and a red laser. The three-primary color laser and the red laser are located on the same side of the lens module and are respectively parallel to the central axis of the lens module. The red light source in the three-primary color laser is opposite to the red laser and has a coaxial optical path. The blue light source and the green light source of the three-primary color laser are not coaxial with the optical path of the red laser. The red light of the three-primary color laser and the red laser are modulated by a half-wave plate and reflected by a dichroic mirror in sequence, and are emitted as two parallel red lights. The blue and green lights of the three-primary color laser are sequentially emitted by a beam splitter and a first reflector as two parallel blue and green lights. The two blue and green lights are respectively combined with the two red lights to form two three-color lasers. The two three-color lasers are guided to the lens module through the modulation module.

2. A dual laser light source micro LCOS projection illumination system as claimed in claim 1, characterized in that: There are two half-wave plates, which are respectively arranged at the red light source of the three-primary color laser and the light output side of the red laser. The half-wave plates are respectively arranged in parallel with the three-primary color laser and the red laser.

3. A dual laser light source micro LCOS projection illumination system as claimed in claim 2, characterized in that: There are two dichroic mirrors, which are respectively arranged on one side of the two half-wave plates away from the light source. The dichroic mirrors are arranged obliquely with the half-wave plates located in the same optical path.

4. A dual-laser light source micro LCOS projection illumination system as claimed in claim 3, characterized in that: The dichroic mirrors are arranged at 45 degrees to the half-wave plates located in the same optical path.

5. A dual-laser light source micro LCOS projection illumination system as claimed in claim 4, characterized in that: The arrangement direction of the beam splitter is parallel to the dichroic mirror of the three-primary color laser, the arrangement direction of the beam splitter is parallel to the first reflector, and the arrangement direction of the first reflector and the dichroic mirror of the red light laser is perpendicular.

6. A dual-laser light source micro LCOS projection illumination system as claimed in claim 5, characterized in that: The modulation module includes a diffuser, a first fly-eye lens group, a second fly-eye lens group, a second reflector, a metal wire grid, a delay plate, an LCOS chip and an analyzer. The first fly-eye lens group includes a first fly-eye lens, a first lens and a second lens. The second fly-eye lens group includes a second fly-eye lens, a third lens and a fourth lens. The diffuser, the first fly-eye lens, the first lens, the second lens, the second fly-eye lens, the second reflector, the third lens, the fourth lens, the metal wire grid, the delay plate, the LCOS chip and the analyzer are sequentially arranged on the incident light axis.

7. A dual-laser light source micro LCOS projection illumination system as claimed in claim 6, characterized in that: The arrangement directions of the diffuser, the first fly-eye lens, the first lens, the second lens, the second fly-eye lens, the third lens, the fourth lens, the delay plate, the LCOS chip and the analyzer are perpendicular to the incident light axis, and the arrangement directions of the second reflector and the metal wire grid are respectively inclined to the incident light axis.

8. A dual laser light source micro LCOS projection illumination system as claimed in claim 7, characterized in that: The arrangement directions of the second reflector and the metal wire grid are respectively 45° to the incident light axis.

9. A dual-laser light source micro LCOS projection illumination system as claimed in claim 8, characterized in that: The arrangement direction of the diffuser, the first fly-eye lens, the first lens, the second lens, the second fly-eye lens and the analyzer is perpendicular to the central axis of the lens, and the arrangement direction of the third lens, the fourth lens, the delay plate and the LCOS chip is parallel to the central axis of the lens module.

10. A dual-laser light source micro LCOS projection illumination system as claimed in claim 9, characterized in that: The lens module includes a pixel dither and an imaging lens, and the pixel dither is arranged between the modulation module and the imaging lens.

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