Polarization illumination system based on RGB color combination

Abstract

The utility model provides a polarization illumination system based on RGB color combination, which comprises a light-emitting mechanism, a collimation mechanism, a polarization mechanism, a color combination mechanism and a dodging mechanism, and is characterized in that the light-emitting mechanism comprises three light-emitting assemblies, and the three light-emitting assemblies are respectively used for providing monochromatic light with three primary colors of red, green and blue; the collimation mechanism comprises three collimation assemblies; the polarization mechanism comprises three polarization parts which are arranged at intervals in the arrangement direction of the three collimation assemblies, the polarization parts can convert at least one part of the non-polarized light in the polarization direction once to obtain first emergent light, and the polarization parts can convert at least the other part of the non-polarized light in the polarization direction twice to obtain second emergent light; the polarization directions of the first emergent light and the second emergent light are the same; the color combining mechanism is used for combining the emergent light of the three polarizing parts; the light uniformizing mechanism is used for improving the uniformity of emergent light of the color combining mechanism. The polarization lighting system solves the problems of low light energy utilization rate and complex manufacturing process of the polarization lighting system in the prior art.

Description

Technical Field

[0001] The utility model relates to the technical field of projection display equipment, in particular to a polarization lighting system based on RGB combined colors. Background Art

[0002] In current common projection display devices, the image modulator can use an externally illuminated liquid crystal display (LCD) screen, including transmissive liquid crystal displays (LCDs) and reflective liquid crystal on silicon (LCOS). However, LCDs and LCOS screens only function properly under polarized light illumination, necessitating the use of a polarizing element in the optical system. If conventional devices such as linear polarizers are used, while light with a certain polarization direction is transmitted, light with the corresponding orthogonal polarization direction is discarded. This significantly reduces the system's energy efficiency, and the resulting projected image brightness will also be low.

[0003] In some publicly available projection optical system designs, a polarization conversion system (PCS) can be used to convert a single polarization state. The PCS can be considered an array of multiple polarization beam splitters (PBSs), with limiting apertures spaced apart on the light-entering side and 1 / 2 wave plates spaced apart on the light-emitting side. This allows the incident non-polarized light to be converted into linearly polarized light with a single polarization direction. At the same time, a microlens array is placed in front of the PCS to converge the light. The alignment requirements for the two are strict, and the manufacturing process is complex. Furthermore, due to the large divergence angle of the light emitted through the microlens array, the efficiency of converting the non-polarized state to the linearly polarized state is reduced, which in turn affects the energy transmission of the polarized light.

[0004] That is to say, the polarized illumination system in the prior art has the problems of low light energy utilization and complex manufacturing process. Utility Model Content

[0005] The main purpose of the utility model is to provide a polarized lighting system based on RGB color combination to solve the problems of low light energy utilization and complex manufacturing process in the prior art polarized lighting system.

[0006] In order to achieve the above-mentioned purpose, the utility model provides a polarized lighting system based on RGB color combination, comprising: a light-emitting mechanism, which comprises three light-emitting components located on the same straight line, and the three light-emitting components are respectively used to provide monochromatic light of the three primary colors of red, green and blue, and the monochromatic light is non-polarized light; a collimating mechanism, which comprises three collimating components, and the collimating components are arranged in a one-to-one correspondence with the light-emitting components; a polarizing mechanism, which is located on the light-emitting side of the collimating mechanism, and the polarizing mechanism comprises three polarizing parts arranged at intervals along the arrangement direction of the three collimating components, and the polarizing parts are arranged in a one-to-one correspondence with the light-emitting components. The polarizing mechanism is configured to correspond to the collimating assembly in a one-to-one manner. The polarizing mechanism can convert the polarization direction of at least a portion of the non-polarized light once to obtain a first output light. The polarizing mechanism can convert the polarization direction of at least another portion of the non-polarized light twice to obtain a second output light. The polarization directions of the first output light and the second output light are the same. The color combining mechanism is located on the light output side of the polarizing mechanism and is used to combine the output lights of the three polarizing mechanisms. The light homogenizing mechanism is located on the light output side of the color combining mechanism and is used to improve the uniformity of the output light of the color combining mechanism.

[0007] Furthermore, the polarizing part includes: a polarization splitting part, which can split the incident non-polarized light into a first light beam and a second light beam with orthogonal polarization directions, and the propagation directions of the first light beam and the second light beam are perpendicular to each other. The polarization splitting part can convert the polarization direction of the second light beam so that the second light beam is emitted as the second output light; a refraction part, which is used to change the propagation direction of the first light beam so that the first light beam is emitted as the first output light, and the propagation directions of the first output light and the second output light are the same.

[0008] Furthermore, along the arrangement direction of the three collimating components, the polarization mechanism includes a first right-angle prism, a first rhombus prism to a fifth rhombus prism and a second right-angle prism glued together in sequence, and the center lines of the light incident surfaces of the first rhombus prism, the third rhombus prism and the fifth rhombus prism are respectively coaxially arranged with the optical axes of the three collimating components.

[0009] Furthermore, the polarization mechanism also includes three 1 / 2 wave plates, which are respectively arranged on the light-emitting surfaces of the first right-angle prism, the second rhombus prism, and the fourth rhombus prism. Polarization splitting layers are respectively arranged on the bonding surfaces of the first right-angle prism and the first rhombus prism, the bonding surfaces of the second rhombus prism and the third rhombus prism, and the bonding surfaces of the fourth rhombus prism and the fifth rhombus prism. The 1 / 2 wave plate and the polarization splitting layer located on the same prism form a polarization splitting part.

[0010] Furthermore, polarized reflective layers are respectively provided on the bonding surfaces of the first right-angle prism and the second rhombus prism, the bonding surfaces of the third rhombus prism and the fourth rhombus prism, and the bonding surfaces of the fifth rhombus prism and the second right-angle prism, and the polarized reflective layers form refractive portions.

[0011] Furthermore, the three light-emitting components are sequentially a first component, a second component and a third component. The first component can emit light having a first monochromatic color, the second component can emit light having a second monochromatic color, and the third component can emit light having a third monochromatic color. The color combining mechanism includes three filters, and the filters are arranged in a one-to-one correspondence with the light-emitting components. Along the direction from the first component to the third component, the filters extend in a direction close to the polarization mechanism, and the angle between the extension direction of the filters and the direction from the first component to the third component is 45°.

[0012] Furthermore, along the direction from the first component to the third component, the three filters are sequentially a first dichroic mirror, a second dichroic mirror and a reflector, the reflector can reflect light with the third monochromatic color, the second dichroic mirror can transmit light with the third monochromatic color and reflect light with the first monochromatic color and light with the second monochromatic color, and the first dichroic mirror can transmit light with the first monochromatic color and reflect light with the second monochromatic color and light with the third monochromatic color, so that the combined beam with the first monochromatic color, the second monochromatic color and the third monochromatic color is emitted from the light output side of the first dichroic mirror.

[0013] Furthermore, along a direction perpendicular to the arrangement direction of the three polarizing portions, a projection of the filter on the polarizing portion is the same as an area of the polarizing portion.

[0014] Furthermore, the light homogenizing mechanism includes a fly-eye lens, and the length of the fly-eye lens is greater than or equal to the width of the output light of the color combining mechanism.

[0015] Furthermore, the light homogenizing mechanism further includes a first relay lens, which is coaxially arranged with the fly-eye lens, and at least one of a light incident side surface of the first relay lens and a light exit side surface of the first relay lens is a convex surface.

[0016] Furthermore, the light homogenizing mechanism also includes: a refractive assembly, the light incident side of the refractive assembly is coaxially arranged with the first relay lens, and the refractive assembly is used to change the propagation direction of the light emitted by the first relay lens; a second relay lens, the second relay lens is coaxially arranged with the light exit side of the refractive assembly.

[0017] Furthermore, the collimating assembly includes at least a first lens and a second lens, and at least one of the light incident side surface and the light exit side surface of the first lens and the second lens is a convex surface.

[0018] Furthermore, the polarized illumination system based on RGB color combination also includes a display chip, which is coaxially arranged with the light-emitting side of the light homogenizing mechanism, and the incident angle of the output light of the light homogenizing mechanism incident on the display chip is less than 20°.

[0019] Applying the technical solution of the present invention, a polarized illumination system based on RGB color combination includes a light-emitting mechanism, a collimating mechanism, a polarizing mechanism, a color combining mechanism and a light homogenizing mechanism. The light-emitting mechanism includes three light-emitting components located on the same straight line, and the three light-emitting components are respectively used to provide monochromatic light of the three primary colors of red, green and blue, and the monochromatic light is non-polarized light; the collimating mechanism includes three collimating components, and the collimating components are arranged in a one-to-one correspondence with the light-emitting components; the polarizing mechanism is located on the light-emitting side of the collimating mechanism, and the polarizing mechanism includes three polarizing parts arranged at intervals along the arrangement direction of the three collimating components, and the polarizing parts are arranged in a one-to-one correspondence with the collimating components. The polarizing part can convert the polarization direction of at least a part of the non-polarized light once to obtain a first output light, and the polarizing part can convert the polarization direction of at least another part of the non-polarized light twice to obtain a second output light, and the polarization directions of the first output light and the second output light are the same; the color combining mechanism is located on the light-emitting side of the polarizing mechanism, and the color combining mechanism is used to combine the output light of the three polarizing parts; the light homogenizing mechanism is located on the light-emitting side of the color combining mechanism, and the light homogenizing mechanism is used to improve the uniformity of the output light of the color combining mechanism.

[0020] The present application provides a polarized lighting system based on RGB color synthesis. The light-emitting mechanism can provide monochromatic light of the three primary colors of red, green and blue respectively. After the collimation mechanism, the three monochromatic lights are converged and collimated respectively, so that the light can be incident on the polarization mechanism at a smaller incident angle. The efficiency of converting non-polarized light into linearly polarized light after the polarization mechanism will be higher, which is beneficial to the energy transmission of polarized light, thereby improving the utilization rate of light energy. The three polarizers correspond to the monochromatic light from the three light-emitting components respectively, and polarization conversion is performed on each monochromatic light separately. When the light passes through the polarizer, it can undergo a polarization direction conversion so that the light is divided into two lights with different polarization directions, one of which is emitted from the polarization mechanism as the first outgoing light, and the other is converted into the second outgoing light after the secondary polarization direction conversion of the polarizer. In this way, the two lights with different polarization directions are converted into lights with the same polarization direction for utilization, avoiding the waste of light energy. At the same time, the conversion of polarization direction is realized by the polarizer, reducing the occupied volume of the polarization mechanism and avoiding the complexity of the processing and assembly process of the polarization mechanism. In addition, the three polarizing parts convert the polarization directions of the three monochromatic lights in the same way, ensuring that all three monochromatic lights can participate in the illumination, avoiding the lack of some monochromatic lights causing uneven color of the illumination light. After the three monochromatic lights are converted into light with a single polarization direction by the polarization mechanism respectively, they are combined by the color combining mechanism and then passed through the light homogenizing mechanism to evenly mix and converge the illumination light, ensuring that the illumination light has good uniformity and high brightness. Therefore, the polarization illumination system based on RGB color combination provided by the present application has a polarization efficiency of nearly 90% while converting the three monochromatic lights to the same polarization direction, and the light energy utilization rate is high. After the color combination, the light also has high uniformity and high intensity. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings constituting part of this application are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0022] Figure 1 The figure shows a schematic structural diagram of a polarized lighting system based on RGB color combination according to the first embodiment of the present invention;

[0023] Figure 2 Shown Figure 1 A schematic diagram of an angle of the polarization illumination system based on RGB color synthesis;

[0024] Figure 3 Shown Figure 1 Schematic diagram of the structure of the polarization mechanism;

[0025] Figure 4 Shown Figure 1 Light path diagram of polarized lighting system based on RGB color combination;

[0026] Figure 5 Shown Figure 4 An enlarged schematic diagram of part A in FIG;

[0027] Figure 6 Shown Figure 1 Illumination distribution diagram of the receiving surface of the display chip based on the RGB color combination polarization illumination system.

[0028] The above drawings include the following reference numerals:

[0029] 10. Light-emitting mechanism; 11. Light-emitting component; 111. First component; 112. Second component; 113. Third component; 20. Collimating mechanism; 21. Collimating component; 22. First lens; 23. Second lens; 30. Polarizing mechanism; 31. First right-angle prism; 32. First rhombus prism; 33. Second rhombus prism; 34. Third rhombus prism; 35. Fourth rhombus prism; 36. Fifth rhombus prism; 37. Second right-angle prism; 38. Half-wave plate; 391. Polarization splitting layer; 392. Polarization reflecting layer; 40. Color combining mechanism; 41. First dichroic mirror; 42. Second dichroic mirror; 43. Reflector; 44. Filter; 50. Light homogenizing mechanism; 51. Fly-eye lens; 52. First relay lens; 53. Second relay lens; 54. Refraction component; 60. Display chip. DETAILED DESCRIPTION

[0030] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0031] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0032] In the present invention, unless otherwise specified, directional words such as "up, down, top, bottom" are usually used with reference to the directions shown in the drawings, or with reference to the components themselves in the vertical, perpendicular or gravity direction; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above directional words are not used to limit the present invention.

[0033] It should be noted that in this specification, the terms "first," "second," "third," etc., are used solely to distinguish one feature from another and do not limit the features. Thus, the first lens discussed below could also be referred to as the second lens or the third lens without departing from the teachings of this application.

[0034] In the drawings, the thickness, size, and shape of the lenses are slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical and aspherical surfaces shown in the drawings are provided by way of example. That is, the shapes of the spherical and aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0035] In this article, the paraxial area refers to the area near the optical axis. If the lens surface is convex and the convex surface position is not defined, it means that the lens surface is convex at least in the paraxial area; if the lens surface is concave and the concave surface position is not defined, it means that the lens surface is concave at least in the paraxial area. The surface of each lens close to the object side is called the object side surface of the lens, and the surface of each lens close to the image side is called the image side surface of the lens. The judgment of the surface shape in the paraxial area can be based on the judgment method of common knowledge in this field, and the positive and negative R value (R refers to the curvature radius of the paraxial area, usually refers to the R value on the lens database (lens data) in the optical software) is used to judge the convexity. In terms of the object side, when the R value is positive, it is judged to be convex, and when the R value is negative, it is judged to be concave; in terms of the image side, when the R value is positive, it is judged to be concave, and when the R value is negative, it is judged to be convex.

[0036] In order to solve the problems of low light energy utilization and complex manufacturing process of polarized lighting systems in the prior art, the utility model provides a polarized lighting system based on RGB color combination.

[0037] like Figures 1 to 6As shown, the polarized lighting system based on RGB color combination includes a light-emitting mechanism 10, a collimating mechanism 20, a polarizing mechanism 30, a color combining mechanism 40 and a light homogenizing mechanism 50. The light-emitting mechanism 10 includes three light-emitting components 11 located on the same straight line. The three light-emitting components 11 are respectively used to provide monochromatic light of the three primary colors of red, green and blue, and the monochromatic light is non-polarized light; the collimating mechanism 20 includes three collimating components 21, and the collimating components 21 are arranged in a one-to-one correspondence with the light-emitting components 11; the polarizing mechanism 30 is located on the light-emitting side of the collimating mechanism 20, and the polarizing mechanism 30 includes three collimating components 21 arranged at intervals along the arrangement direction of the three collimating components 21. The three polarizing parts are arranged in a one-to-one correspondence with the collimating component 21. The polarizing part can convert the polarization direction of at least a part of the non-polarized light once to obtain a first output light, and the polarizing part can convert the polarization direction of at least another part of the non-polarized light twice to obtain a second output light. The polarization directions of the first output light and the second output light are the same; the color combining mechanism 40 is located on the light output side of the polarization mechanism 30, and the color combining mechanism 40 is used to combine the output lights of the three polarizing parts; the light homogenizing mechanism 50 is located on the light output side of the color combining mechanism 40, and the light homogenizing mechanism 50 is used to improve the uniformity of the output light of the color combining mechanism 40.

[0038] The present application provides a polarized lighting system based on RGB color synthesis. The light-emitting mechanism 10 can provide monochromatic light of the three primary colors of red, green and blue respectively. After passing through the collimating mechanism 20, the three monochromatic lights are converged and collimated respectively, so that the light can be incident on the polarizing mechanism 30 at a smaller incident angle. The efficiency of converting non-polarized light into linearly polarized light after passing through the polarizing mechanism 30 will be higher, which is conducive to the energy transmission of polarized light, thereby improving the utilization rate of light energy. The three polarizing parts correspond to the monochromatic light from the three light-emitting components respectively, and polarization conversion is performed on each monochromatic light separately. When the light passes through the polarizing part, it can undergo a polarization direction conversion so that the light is divided into two lights with different polarization directions, one of which is emitted from the polarizing mechanism 30 as the first output light, and the other is further converted by the secondary polarization direction of the polarizing part to become the second output light. In this way, the two lights with different polarization directions are converted into lights with the same polarization direction for utilization, avoiding waste of light energy. At the same time, the polarization direction conversion is realized by the polarizing part, reducing the occupied volume of the polarizing mechanism 30 and avoiding the complexity of the processing and assembly process of the polarizing mechanism 30. In addition, the three polarizing parts convert the polarization directions of the three monochromatic lights in the same way, ensuring that all three monochromatic lights can participate in the illumination, avoiding the lack of some monochromatic lights causing uneven color of the illumination light. After the three monochromatic lights are converted into light with a single polarization direction by the polarization mechanism 30 respectively, they are combined by the color combining mechanism 40 and then passed through the light homogenizing mechanism 50 to evenly mix and converge the illumination light, ensuring that the illumination light has good uniformity and high brightness. Therefore, the polarization illumination system based on RGB color combination provided by the present application has a polarization efficiency of nearly 90% while converting the three monochromatic lights to the same polarization direction, and the light energy utilization rate is high. After the color combination, the light also has high uniformity and high intensity.

[0039] Specifically, the polarizing section includes a polarization splitting section and a refraction section. The polarization splitting section can split the incident non-polarized light into a first light beam and a second light beam with orthogonal polarization directions. The propagation directions of the first light beam and the second light beam are perpendicular to each other. The polarization splitting section can convert the polarization direction of the second light beam so that the second light beam is emitted as the second output light. The refraction section is used to change the propagation direction of the first light beam so that the first light beam is emitted as the first output light. The propagation directions of the first output light and the second output light are the same. In other words, the polarizing section is used to polarize and split the light path. The polarization splitting section polarizes the incident non-polarized light once, and splits it into a first light beam and a second light beam with perpendicular polarization directions and propagation directions. The polarization direction of the first light beam is the polarization direction of the final illumination light (S light). Therefore, the propagation direction of the first light beam only changes after passing through the refraction section so that it is consistent with the propagation direction of the second light beam, and the polarization direction is no longer changed. At the same time, in order to improve the utilization rate of light energy, the polarization splitter changes the polarization direction of the second light beam again, that is, the P light is changed into S light, so that it is consistent with the polarization direction of the first light beam, thereby obtaining the first and second outgoing lights with the same propagation direction and polarization direction. In this way, the polarization efficiency is close to 90%, which greatly improves the utilization rate of light energy.

[0040] like Figure 2 and Figure 3 As shown, along the arrangement direction of the three collimating assemblies 21, the polarization mechanism 30 includes a first right-angle prism 31, first rhombic prisms 32 to fifth rhombic prisms 36, and a second right-angle prism 37, which are glued together in sequence. The centerlines of the light-entering surfaces of the first rhombic prism 32, the third rhombic prism 34, and the fifth rhombic prism 36 are coaxially arranged with the optical axes of the three collimating assemblies 21. The polarization mechanism 30 is used to convert the unpolarized light emitted by the three collimating assemblies 21 into light with the same polarization direction. By gluing multiple prisms in sequence along the arrangement direction of the three collimating assemblies 21, the polarization mechanism 30 can change the polarization direction of all three monochromatic lights. Furthermore, the polarization mechanism 30 is simple to manufacture and does not require complex assembly. The center lines of the light incident surfaces of the first rhombus 32, the third rhombus 34 and the fifth rhombus 36 are respectively arranged coaxially with the optical axes of the three collimating components 21. The three monochromatic lights emitted by the three collimating components 21 can be incident on the polarization mechanism 30 through the light incident surfaces of the first rhombus 32, the third rhombus 34 and the fifth rhombus 36 respectively. At the same time, the light can be incident on the polarization mechanism 30 at a smaller incident angle, avoiding a large amount of light from being unable to enter the polarization mechanism 30 and being wasted, thereby improving the utilization rate of light energy.

[0041] like Figure 2 and Figure 3As shown, the polarization mechanism 30 also includes three 1 / 2 wave plates 38, and the 1 / 2 wave plates 38 are respectively arranged on the light-emitting surfaces of the first right-angle prism 31, the second rhombus prism 33, and the fourth rhombus prism 35. Polarization splitting layers 391 are respectively arranged on the bonding surfaces of the first right-angle prism 31 and the first rhombus prism 32, the bonding surfaces of the second rhombus prism 33 and the third rhombus prism 34, and the bonding surfaces of the fourth rhombus prism 35 and the fifth rhombus prism 36. The 1 / 2 wave plate 38 and the polarization splitting layer 391 located on the same prism form a polarization splitting part. That is to say, the polarization splitting layer 391 and the 1 / 2 wave plate 38 on the first rhombus prism 32 form a polarization splitting portion for changing the polarization direction of a monochromatic light, the polarization splitting layer 391 and the 1 / 2 wave plate 38 on the third rhombus prism 34 form a polarization splitting portion for changing the polarization direction of another monochromatic light, and the polarization splitting layer 391 and the 1 / 2 wave plate 38 on the fifth rhombus prism 36 form a polarization splitting portion for changing the polarization direction of another third monochromatic light. The polarization splitting layer 391 performs a polarization splitting process on the incident unpolarized light, resulting in two light beams with different polarization directions and propagation directions. The reflected S light no longer changes its polarization direction, while the transmitted P light becomes S light when passing through the half-wave plate. The polarization direction of the light exiting the half-wave plate becomes the same as that of the final illumination light. Thus, even if the polarization splitting layer 391 generates two light beams with different polarization directions, both beams can ultimately be converted to the same polarization direction and used as illumination light. This avoids wasting one of the light beams and greatly improves light energy utilization.

[0042] like Figure 3As shown, polarizing reflective layers 392 are provided on the bonding surfaces of the first right-angle prism 31 and the second rhombic prism 33, the bonding surfaces of the third rhombic prism 34 and the fourth rhombic prism 35, and the bonding surfaces of the fifth rhombic prism 36 and the second right-angle prism 37, respectively. The polarizing reflective layers 392 form a refractive portion. Of the two beams of light polarized by the polarization splitting layer 391, one of the beams has the same polarization direction as the final illumination light, but its propagation direction is altered compared to the incident unpolarized light (i.e., the first beam described above). By providing the polarizing reflective layer 392 as a refractive portion, the first beam is refracted and emitted from the polarization mechanism 30, thereby transmitting backward together with the second beam polarized by the polarization splitting layer 391, in the same propagation direction. The light beam split by the polarization splitting layer 391 on the first rhombus prism 32 passes through the second rhombus prism 33 and reaches the polarization reflective layer 392 on the second rhombus prism 33 before being reflected. The beam propagates in the same direction as the other light beam split by the polarization splitting layer 391 on the first rhombus prism 32. Similarly, the polarization splitting layer 391 on the third rhombus prism 34 and the polarization reflective layer 392 on the fourth rhombus prism 35 have the same coordination, and the polarization splitting layer 391 on the fifth rhombus prism 36 and the polarization reflective layer 392 on the second right-angle prism 37 have the same coordination.

[0043] It should be noted that since the propagation directions of the first light beam and the second light beam emitted from the polarization splitting part are perpendicular to each other, and the refractive part can change the propagation direction of the second light beam to be the same as the propagation direction of the first light beam, the angle between the polarization splitting layer 391 and the incident surface of the rhombus prism is 45°.

[0044] like Figure 1 and Figure 2As shown, the three light-emitting assemblies 11 are sequentially comprised of a first assembly 111, a second assembly 112, and a third assembly 113. The first assembly 111 is capable of emitting light having a first monochromatic color, the second assembly 112 is capable of emitting light having a second monochromatic color, and the third assembly 113 is capable of emitting light having a third monochromatic color. The color combining mechanism 40 includes three filters 44, each corresponding to one of the light-emitting assemblies 11. From the first assembly 111 toward the third assembly 113, the filters 44 extend toward the polarization mechanism 30, forming a 45° angle with the direction from the first assembly 111 toward the third assembly 113. The light-emitting assembly 11 comprises the first assembly 111, the second assembly 112, and the third assembly 113, responsible for emitting light having the first, second, and third monochromatic colors, respectively. From the first assembly 111 toward the third assembly 113, the filters 44 extend toward the polarization mechanism 30 and are arranged at a 45° angle. After passing through the polarization mechanism 30, the light of the first, second, and third monochromatic colors is converted from unpolarized light to light of the same polarization direction. Subsequently, three filters 44 are directed along the direction from the first component 111 to the third component 113 to receive the polarized light of the first monochromatic color emitted by the first component 111, the polarized light of the second monochromatic color emitted by the second component 112, and the polarized light of the third monochromatic color emitted by the third component 113, respectively. Ultimately, three colors of the same polarization are combined using a simple process while efficiently utilizing light energy. The filters 44 are all arranged at a 45° angle to facilitate the alignment of the propagation directions of the three different monochromatic lights after the combination.

[0045] like Figure 1 and Figure 2As shown, along the direction from the first component 111 to the third component 113, the three filters 44 are sequentially a first dichroic mirror 41, a second dichroic mirror 42, and a reflector 43. The reflector 43 can reflect light having the third monochromatic color, the second dichroic mirror 42 can transmit light having the third monochromatic color and reflect light having the first monochromatic color and the second monochromatic color. The first dichroic mirror 41 can transmit light having the first monochromatic color and reflect light having the second monochromatic color and the third monochromatic color, so that the combined light beam having the first monochromatic color, the second monochromatic color, and the third monochromatic color is emitted from the light-emitting side of the first dichroic mirror 41. The light having the third monochromatic color is reflected by the reflector 43 to the second dichroic mirror 42. The second dichroic mirror 42 can transmit the light having the third monochromatic color, causing it to enter the first dichroic mirror 41 and, after being reflected by the first dichroic mirror 41, be emitted from the light-emitting side of the first dichroic mirror 41. The light of the second monochromatic color is reflected by the second dichroic mirror 42 and reaches the first dichroic mirror 41. After being reflected by the first dichroic mirror 41, it is emitted from the light-exiting side of the first dichroic mirror 41. The light of the first monochromatic color is directly transmitted by the first dichroic mirror 41 and then emitted from the light-exiting side of the first dichroic mirror 41. Therefore, the three monochromatic lights are combined by the three filters 44 and emitted from the light-exiting side of the first dichroic mirror 41.

[0046] Specifically, along the direction perpendicular to the arrangement of the three polarizing parts, the projection of the filter 44 on the polarizing parts is the same as the area of the polarizing parts. This arrangement ensures that the filter can receive all the light emitted from the polarizing parts, thereby ensuring the utilization rate of light energy.

[0047] Optionally, the polarizing reflection layer 392 and the polarizing beam splitting layer 391 are disposed on the entire bonding surface, so that the sum of the widths of the first right-angle prism 31 and the first rhombic prism 32 is equal to the projection of the first dichroic mirror 41 on the first right-angle prism 31 and the first rhombic prism 32. Similarly, the sum of the widths of the second rhombic prism 33 and the third rhombic prism 34 is equal to the projection of the second dichroic mirror 42 on the second rhombic prism 33 and the third rhombic prism 34, and the sum of the widths of the fourth rhombic prism 35 and the fifth rhombic prism 36 is equal to the projection of the reflector 43 on the fourth rhombic prism 35 and the fifth rhombic prism 36. In this way, the three filters 44 can encompass all incident polarized light, thereby achieving a complete optical path and a unified optical path state.

[0048] like Figure 1 and Figure 2As shown, the light homogenizing mechanism 50 includes a fly-eye lens 51, the length of which is greater than or equal to the width of the light emitted by the color combining mechanism 40. The fly-eye lens 51 is a double-sided microlens array structure, with the centers of the corresponding sub-eye curved surfaces on both sides aligned. This subdivides and diffuses the light beam emitted by the color combining mechanism 40, achieving color mixing and light homogenization. The sub-eye curved surfaces are spherical, aspherical, or free-form surfaces with identical or similar geometric parameters, and their focal lengths are close to the spacing between the microstructured surfaces on both sides, which can reduce optical crosstalk when light is incident at large angles. The length of the fly-eye lens 51 is greater than or equal to the width of the light emitted by the color combining mechanism 40, ensuring that the fly-eye lens 51 receives all the light emitted by the color combining mechanism 40, thereby ensuring light energy utilization.

[0049] Optionally, along the direction from the first component 111 to the third component 113 , the distance between the first dichroic mirror 41 and the second dichroic mirror 42 is less than or equal to the length of the fly-eye lens 51 .

[0050] like Figure 1 and Figure 2 As shown, the light homogenizing mechanism 50 further includes a first relay lens 52, which is coaxially arranged with the fly-eye lens 51. At least one of the light-entering surface and the light-exiting surface of the first relay lens 52 is convex. This arrangement can converge the finely divided beams emitted by the fly-eye lens 51 and spatially overlap and homogenize them, thereby obtaining more uniform light to illuminate the display chip.

[0051] like Figure 1 and Figure 2 As shown, the light homogenizing mechanism 50 also includes a refraction assembly 54 and a second relay lens 53. The light-entry side of the refraction assembly 54 is coaxially arranged with the first relay lens 52, and the refraction assembly 54 is used to change the propagation direction of the light emitted by the first relay lens 52. The second relay lens 53 is coaxially arranged with the light-exit side of the refraction assembly 54. By providing the refraction assembly 54 to change the propagation direction of the light, and by the second relay lens 53 to further converge the light, good illumination uniformity is achieved on the display chip.

[0052] Optionally, the refractive assembly 54 includes a turning mirror, which can be a PBS prism, which is formed by gluing two right-angle prisms together, with a polarization splitting film layer coated on the glued inclined surface or a polarization splitting film attached to it. It can also be a right-angle prism or a plane mirror, with a reflective film layer coated on the inclined surface or a reflective film attached to it, which is used to reflect S-polarized light to achieve a turning of the illumination light path.

[0053] like Figure 1 and Figure 2As shown, the collimating assembly 21 includes at least a first lens 22 and a second lens 23. At least one of the light-entering and light-exiting surfaces of the first lens 22 and the second lens 23 is a convex surface. Along the direction from the first assembly 111 to the third assembly 113, the three collimating assemblies 21 correspond to the first assembly 111, the second assembly 112, and the third assembly 113 one-to-one. The collimating assembly 21 includes the first lens 22 and the second lens 23 in sequence along the optical path. At least one of the light-entering and light-exiting surfaces of the first lens 22 and the second lens 23 is a convex surface, which is conducive to converging light and reducing light energy loss, ultimately achieving convergence and collimation of the three monochromatic lights, which are incident on the polarization mechanism 30 at a smaller incident angle.

[0054] like Figure 1 and Figure 2 As shown, the polarized illumination system based on RGB color combination also includes a display chip 60, which is coaxially arranged with the light-emitting side of the light homogenizer 50. The light emitted by the light homogenizer 50 is incident on the display chip 60 at an angle of incidence less than 20°. The light path originates from the light-emitting mechanism 10, passes through the collimator 20, the polarizer 30, the color combination mechanism 40, and the light homogenizer 50, and is projected onto the display chip 60 at an angle of incidence less than 20°, forming a uniform display of a certain proportion of shapes.

[0055] Optionally, the display chip 60 may be an LCD or an LCOS, which can display images by changing the twisting angle of liquid crystal molecules through controlling the applied voltage.

[0056] Example 1

[0057] like Figures 1 to 6 As shown, the polarized illumination system based on RGB color combination in this embodiment includes a light-emitting device 10, a collimating device 20, a polarizing device 30, a color combining device 40, a light homogenizing device 50, and a display chip 60. Along the direction from the first component 111 to the third component 113, the three light-emitting components 11 each include three monochromatic LED light sources with Lambertian light intensity distribution, providing red, green, and blue primary color beams, respectively. The dominant wavelength of the red LED is 610-622 nm, the dominant wavelength of the green LED is 518-536 nm, and the dominant wavelength of the blue LED is 455-465 nm. All three monochromatic lights are unpolarized.

[0058] like Figure 4As shown, the color combining mechanism 40 includes a first dichroic mirror 41, a second dichroic mirror 42, and a reflector 43. The surface of the first dichroic mirror 41 is coated with a filter layer that transmits red light and reflects green and blue light. The surface of the second dichroic mirror 42 is coated with a filter layer that transmits blue light and reflects red and green light. The surface of the reflector 43 is coated with at least a blue light reflective layer. The blue light emitted from the fourth rhombus 35 and the fifth rhombus 36 is reflected by the reflector 43, propagates from the third component 113 to the direction of the first component 111, passes through the second dichroic mirror 42, reaches the first dichroic mirror 41, and is reflected again, thereby being emitted between the first dichroic mirror 41 and the second dichroic mirror 42. The green light emitted from the second rhombus 33 and the third rhombus 34 is reflected by the second dichroic mirror 42, reaches the first dichroic mirror 41, and is reflected again. The red light emitted from the first right-angle prism 31 and the first rhombus prism is transmitted through the first dichroic mirror 41 and then emitted. Finally, the red, green and blue lights are parallelly converged on the same optical path, realizing the combination of three monochromatic lights.

[0059] like Figure 4 As shown, the refractive assembly 54 is composed of two reflective right-angle prisms. The polarized light after color combination by the color combination mechanism 40 passes through the fly-eye lens 51 and the first relay lens 52 in sequence, and converges the light path to the coaxial reflective right-angle prism. After being reflected, the light path passes through the second relay lens 53, thereby realizing the light path deflection. Figure 5 As shown, microlens array units are positioned on either side of the fly-eye lens 51, achieving a color mixing and light homogenization function similar to that of a Köhler illumination system. The nearly collimated wide light beam emitted by the color combining mechanism 40 is focused by the microlens units on the light-entrance surface of the fly-eye lens 51 and subdivided into multiple sub-beams arranged in an array. This is equivalent to subdividing the entire light source into multiple sub-light sources that are imaged near the light-exit surface.

[0060] Specifically, to meet the color mixing and uniform light conditions similar to those of a Köhler illumination system, the curved surfaces of all microlens units in the fly-eye lens 51 are spherical, aspherical, or free-form surfaces with identical or similar geometric parameters. Typically, the focal length is between 0.4 and 0.7 mm. This focal length is close to the distance between the two microstructured surfaces, i.e., the thickness of the fly-eye lens 51, which reduces optical crosstalk when light is incident at large angles.

[0061] Specifically, based on the effective area of the display chip 60 and appropriate light energy utilization, the illumination spot is generally rectangular or square, and its aspect ratio should be consistent with the display chip. For example, the aspect ratio of a DMD chip is usually 4:3 or 16:9.

[0062] Optionally, to achieve a square light spot, the microlens units, each pair facing each other on the light exit and light entrance surfaces of the fly-eye lens 51, are arranged in a square array, so that the corresponding small aperture of each unit is square. The light spot size is proportional to the aperture of the microlens unit. By adjusting the row and column spacing of the microlens array, the microlens unit aperture can be controlled, thereby achieving different illumination spot sizes to achieve uniform illumination of the display chip 60. Specifically, for example, the row and column spacing is set to 0.17 mm. Similarly, if a rectangular light spot is desired, the same principle can be applied.

[0063] Optionally, the first lens 22, second lens 23, first relay lens 52, and second relay lens 53 in the collimator assembly 21 may have spherical, aspherical, or freeform curved surfaces to control the direction of light. Specifically, an antireflection coating may be applied to the lens surfaces to improve transmission efficiency. By optimizing the surface profiles of each lens, good illumination uniformity can be achieved on the display chip 60.

[0064] Optionally, the optical lens can be made by injection molding transparent plastics such as PC and PMMA, or by using flint glass or crown glass materials and processed by one or more processes such as glass molding and cold working.

[0065] Alternatively, based on the projection engine's external dimensions and the downstream imaging system's aperture, the dimensions of the illumination system components can be appropriately controlled to ensure a compact footprint. For compact projection engines, the outer diameter of the illumination system's lenses is typically limited to 3-8 mm.

[0066] like Figure 6 As shown, the optical components of the polarized illumination system are rationally designed and configured. Light emitted from the red, green, and blue monochromatic light sources is collimated by the collimator 20, polarized by the polarizer 30, combined by the color combiner 40, shaped by the fly-eye lens 51, deflected by the refractive component 54, and converged by the first and second relay lenses 52 and 53. The light then enters the LCOS at an appropriate beam angle to effectively pass through the subsequent imaging system. For example, in one embodiment, the angle should be less than 20°. A relatively uniform square light spot is formed within the receiving window on the LCOS surface, with illumination uniformity exceeding 85% and uniform color. The LCOS effective window receives approximately 29.4% of the light source energy, exceeding similar products in the industry and offering performance advantages.

[0067] In this embodiment, the unpolarized light beams emitted by the separate red, green, and blue monochromatic light sources are collimated by the corresponding collimating assembly 21 and polarized by the polarizing element, then converted into S-polarized light. The light beams then enter the color combining mechanism 40 from three parallel optical axis directions for red, green, and blue beam combining. The incident light beams are then subdivided and shaped by the microstructured surface of the fly-eye lens 51. The sub-beams are emitted through the microlens units positioned opposite each other on the light-emitting surface of the fly-eye lens 51, converged by the curved surfaces of the subsequent first relay lens 52 and second relay lens 53, and then deflected by a deflection mirror such as a polarization beam splitter prism, a reflective right-angle prism, or a reflective plane mirror. The resulting sub-light spots are spatially superimposed on each other. Due to the array symmetry of the sub-beams, the energy and color non-uniformities of the sub-beams cancel each other out, ultimately forming a relatively uniform target light spot on the surface of the display chip 60.

[0068] Obviously, the embodiments described above are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0069] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, tasks, devices, components and / or combinations thereof.

[0070] It should be noted that the terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0071] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A polarized lighting system based on RGB color combination, characterized in that: The polarized lighting system based on RGB color combination includes: A light-emitting mechanism (10), the light-emitting mechanism (10) comprising three light-emitting components (11) located on the same straight line, the three light-emitting components (11) being respectively used to provide monochromatic light of the three primary colors of red, green and blue, wherein the monochromatic light is non-polarized light; A collimation mechanism (20), the collimation mechanism (20) comprising three collimation components (21), the collimation components (21) being arranged in a one-to-one correspondence with the light-emitting components (11); A polarizing mechanism (30), the polarizing mechanism (30) being located on the light-emitting side of the collimating mechanism (20), the polarizing mechanism (30) comprising three polarizing parts arranged at intervals along the arrangement direction of the three collimating components (21), the polarizing parts being arranged in a one-to-one correspondence with the collimating components (21), the polarizing parts being capable of converting the polarization direction of at least a portion of the non-polarized light once to obtain a first output light, and the polarizing parts being capable of converting the polarization direction of at least another portion of the non-polarized light twice to obtain a second output light, the first output light and the second output light having the same polarization direction; a color combining mechanism (40), the color combining mechanism (40) being located on the light-emitting side of the polarization mechanism (30), and the color combining mechanism (40) being used to combine the outgoing light beams of the three polarizing parts; A light homogenizing mechanism (50) is located on the light-emitting side of the color combining mechanism (40), and is used to improve the uniformity of the light emitted by the color combining mechanism (40).

2. The polarization lighting system based on RGB color combination according to claim 1, characterized in that: The polarizing portion includes: a polarization splitter capable of splitting the incident unpolarized light into a first light beam and a second light beam having orthogonal polarization directions, wherein the propagation directions of the first light beam and the second light beam are perpendicular to each other, and the polarization splitter capable of converting the polarization direction of the second light beam so that the second light beam is emitted as the second outgoing light; The refracting portion is used to change the propagation direction of the first light beam so that the first light beam is emitted as the first emergent light, and the propagation directions of the first emergent light and the second emergent light are the same.

3. The polarization lighting system based on RGB color combination according to claim 2, characterized in that: Along the arrangement direction of the three collimating components (21), the polarizing mechanism (30) comprises a first right-angle prism (31), a first rhombus prism (32) to a fifth rhombus prism (36), and a second right-angle prism (37) that are glued together in sequence, and the center lines of the light incident surfaces of the first rhombus prism (32), the third rhombus prism (34), and the fifth rhombus prism (36) are respectively coaxially arranged with the optical axes of the three collimating components (21).

4. The polarization lighting system based on RGB color combination according to claim 3, characterized in that: The polarization mechanism (30) further includes three 1 / 2 wave plates (38), the 1 / 2 wave plates (38) being respectively arranged on the light-emitting surfaces of the first right-angle prism (31), the second rhombus prism (33), and the fourth rhombus prism (35); polarization splitting layers (391) are respectively arranged on the bonding surface of the first right-angle prism (31) and the first rhombus prism (32), the bonding surface of the second rhombus prism (33) and the third rhombus prism (34), and the bonding surface of the fourth rhombus prism (35) and the fifth rhombus prism (36); the 1 / 2 wave plate (38) and the polarization splitting layer (391) located on the same prism form the polarization splitting portion.

5. The polarized lighting system based on RGB color combination according to claim 4, characterized in that: Polarized reflection layers (392) are respectively provided on the bonding surfaces of the first right-angle prism (31) and the second rhombus prism (33), the bonding surfaces of the third rhombus prism (34) and the fourth rhombus prism (35), and the bonding surfaces of the fifth rhombus prism (36) and the second right-angle prism (37), and the polarized reflection layers (392) form the refractive portion.

6. The polarization lighting system based on RGB color combination according to claim 1, characterized in that: The three light-emitting components (11) are sequentially a first component (111), a second component (112), and a third component (113); the first component (111) can emit light having a first monochromatic color, the second component (112) can emit light having a second monochromatic color, and the third component (113) can emit light having a third monochromatic color; the color combining mechanism (40) comprises three filters (44); the filters (44) are arranged in a one-to-one correspondence with the light-emitting components (11); along the direction from the first component (111) to the third component (113), the filters (44) extend in a direction close to the polarization mechanism (30); and the angle between the extension direction of the filters (44) and the direction from the first component (111) to the third component (113) is 45°.

7. The polarization lighting system based on RGB color combination according to claim 6, characterized in that: Along the direction from the first component (111) to the third component (113), the three filters (44) are sequentially a first dichroic mirror (41), a second dichroic mirror (42) and a reflector (43); the reflector (43) is capable of reflecting light having the third monochromatic color; the second dichroic mirror (42) is capable of transmitting light having the third monochromatic color and reflecting light having the first monochromatic color and light having the second monochromatic color; the first dichroic mirror (41) is capable of transmitting light having the first monochromatic color and reflecting light having the second monochromatic color and light having the third monochromatic color, so that a combined light beam having the first monochromatic color, the second monochromatic color and the third monochromatic color is emitted from the light-emitting side of the first dichroic mirror (41).

8. The polarization illumination system based on RGB color combination according to claim 7, characterized in that: Along a direction perpendicular to the arrangement direction of the three polarizing portions, the projection of the filter (44) on the polarizing portion is the same as the area of the polarizing portion.

9. The polarization illumination system based on RGB color combination according to any one of claims 1 to 8, characterized in that: The light homogenizing mechanism (50) comprises a fly-eye lens (51), and the length of the fly-eye lens (51) is greater than or equal to the width of the output light of the color combining mechanism (40).

10. The polarized lighting system based on RGB color combination according to claim 9, characterized in that: The light homogenizing mechanism (50) further includes a first relay lens (52), the first relay lens (52) being coaxially arranged with the fly-eye lens (51), and at least one of a surface on the light-entering side of the first relay lens (52) and a surface on the light-exiting side of the first relay lens (52) being a convex surface.

11. The polarized lighting system based on RGB color combination according to claim 10, characterized in that: The light homogenizing mechanism (50) further comprises: a refractive assembly (54), wherein the light incident side of the refractive assembly (54) is coaxially arranged with the first relay lens (52), and the refractive assembly (54) is used to change the propagation direction of light emitted by the first relay lens (52); A second relay lens (53) is coaxially arranged with the light-emitting side of the refractive assembly (54).

12. The polarization illumination system based on RGB color combination according to any one of claims 1 to 8, characterized in that: The collimating assembly (21) comprises at least a first lens (22) and a second lens (23), wherein at least one of the light incident side surface and the light exit side surface of the first lens (22) and the second lens (23) is a convex surface.

13. The polarization illumination system based on RGB color combination according to any one of claims 1 to 8, characterized in that: The polarized lighting system based on RGB color combination further comprises a display chip (60), the display chip (60) being coaxially arranged with the light-emitting side of the light-homogenizing mechanism (50), and the incident angle of the light emitted from the light-homogenizing mechanism (50) incident on the display chip (60) being less than 20°.

Images