Double-three-color laser light source and miniature LCOS projection optical structure
By using dual tri-color laser light sources and an optimized optical architecture, the problems of low brightness, low color saturation, and poor contrast in LCOS projectors have been solved, achieving high brightness and high performance projection effects, simplifying the equipment structure and reducing costs.
Patent Information
- Application Number
- CN202422984013.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-04
- Publication Date
- 2025-10-17
- Estimated Expiration
- 2034-12-04
AI Technical Summary
Existing LCOS-type projection devices have problems with low brightness, low color saturation and poor contrast, and traditional solutions result in large devices, complex structures and high costs.
It adopts a dual three-color laser light source, with two sets of three-primary-color laser light sources set in parallel. The optical path is optimized by half-wave plates and dichroic mirrors. Combined with the optimized architecture of the light homogenizing part, the illumination part and the imaging part, a U-shaped optical structure is formed to improve the brightness and color characteristics of the light source.
It achieves high brightness and high performance projection, simplifies the optical structure, reduces the size of the device, and optimizes optical performance.
Smart Images
Figure CN223450309U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to laser projector technical field, concretely relates to a kind of double tricolor laser light source and micro LCOS projection optical structure. BACKGROUND
[0002] With the improvement of economic level, projection type product slowly replaces television and enters household appliance market, and part of user's performance requirement to electronic consumer product will be higher and higher.With the development of industry, LCOS type projection slowly replaces LCD, DLP type projection product, and conquers other projection type technology color saturation low and contrast ratio difference problem, and slowly moves towards public vision.
[0003] At present, LCOS type projection exists in laser scheme Low brightness, color saturation low and contrast ratio difference etc. problem, but how to further improve the optical performance of single LCOS chip by laser light source, there is no mature projection product of this type in the market currently.In general, laser projection is used in DLP product is more mature, but laser speckle and low contrast ratio are always industry problems.And generally, to solve the above-mentioned problem, the volume of projection equipment is large, the structure of solving polarization is particularly complex, and the cost is also increased accordingly, even so, the improvement effect is not ideal.
[0004] Therefore, how to further improve the optical performance of single LCOS chip by laser light source has become one of the technical problems that the technical personnel in the field urgently need to solve. UTILITY MODEL CONTENTS
[0005] Therefore, the first technical problem to be solved by the utility model is to provide a double tricolor laser light source to improve the brightness and performance of light source.
[0006] To solve the above technical problem, the technical scheme adopted by the utility model is: a double tricolor laser light source, comprising: two groups of three primary color laser light sources, the blue and green light sources and the red light source of the two groups of three primary color laser light sources are oppositely arranged, a half-wave plate and a dichroic mirror are sequentially arranged on the red light path of the two groups of three primary color laser light sources, the half-wave plates are perpendicular to the incident optical axis of the light path respectively, the dichroic mirrors are 45° with the incident optical axis of the light path respectively, the dichroic mirror is a reverse red and transparent blue-green dichroic mirror, a first mirror is arranged on the blue and green light path of the two groups of three primary color laser light sources respectively, the first mirrors are 45° with the incident optical axis of the blue and green light path respectively, two half-wave plates are parallel, and two dichroic mirrors and two first mirrors are perpendicular respectively.
[0007] The second technical problem to be solved by the utility model is to provide a micro LCOS projection optical structure, which adopts the above-mentioned double tricolor laser light source, optimizes the architecture and improves the projection effect.
[0008] The micro LCOS projection optical structure comprises the double three-color laser light source and a light homogenizing part, an illumination part and an imaging part arranged in sequence along the incident direction of the light source.
[0009] Optionally, the light homogenizing part comprises diffusion sheets, a first compound eye lens, a first lens and a second lens arranged in sequence and perpendicular to the incident optical axis of the light path, and the diffusion sheets receive the outgoing light of the two dichroic mirrors.
[0010] Optionally, the illumination part comprises a second compound eye lens, a second mirror, a third lens, a fourth lens, a metal wire grid, a retardation sheet, an LCOS chip and a polarizer arranged in sequence along the light path, and the second compound eye lens, the second mirror, the third lens, the metal wire grid, the retardation sheet, the LCOS chip and the polarizer are respectively perpendicular to the incident optical axis of the light path, and the second mirror and the metal wire grid are respectively at an angle of 45° with the incident optical axis of the light path.
[0011] Optionally, the imaging part receives the outgoing light of the illumination part, and the imaging part comprises an imaging lens.
[0012] Optionally, the imaging part further comprises a pixel shaker, the pixel shaker is perpendicular to the incident optical axis of the light path, and the pixel shaker is arranged between the polarizer and the imaging lens.
[0013] Compared with the prior art, the utility model has the advantages that:
[0014] The utility model discloses based on above technical scheme provides a double three-color laser light source, two groups of three primary color laser light sources parallel relative arrangement, reasonable layout, through same principle makes red, green, blue three road convergence, makes light source brightness, color characteristic play better, satisfies the pursuit of user to high brightness, high performance, high quality product.
[0015] The utility model discloses still provides a kind of LCOS projection optical structure, uses above-mentioned double three-color laser light source, light homogenizing part, illumination part and imaging part, optimizes optical architecture arrangement, whole adopts "U type" architecture, can be compatible with other different light source scheme, avoid repeating opening mould, guarantee whole light machine brightness, color and contrast play better performance, so that overall optical performance is more optimal. BRIEF DESCRIPTION OF DRAWINGS
[0016] In order to more clearly illustrate the technical scheme in the embodiment of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor.
[0017] Figure 1 A structure schematic diagram of a double three-color laser light source;
[0018] Figure 2 A structure schematic diagram of a micro LCOS projection optical structure;
[0019] Figure 3 A light ray schematic diagram of a micro LCOS projection optical structure;
[0020] Wherein, 11, three primary color laser light sources; 12, half wave plate; 13, two-way dichroic mirror; 14, first mirror;
[0021] 21, diffusion sheet; 22, first fly eye lens; 23, first lens; 24, second lens;
[0022] 31, second fly eye lens; 32, second mirror; 33, third lens; 34, fourth lens; 35, metal wire grid; 36, retardation plate; 37, LCOS chip; 38, polarizer;
[0023] 41, pixel jitter; 42, imaging lens. DETAILED DESCRIPTION
[0024] In order to better understand the present application, the content of the present application will be further clearly described below in conjunction with examples, but the protection content of the present application is not limited to the following examples only. In the following description, a large number of specific details are given in order to provide a more thorough understanding of the present application. However, it is obvious to those skilled in the art that the present application can be implemented without one or more of these details.
[0025] Although relative terms such as "upper" and "lower" are used in the present specification to describe the relative relationship of one component of the icon to another component, these terms are used in the present specification only for convenience, for example, according to the direction of the examples described in the drawings. It can be understood that if the device of the icon is turned upside down, the component described as "upper" will become the component described as "lower". When a structure is "on" another structure, it can mean that the structure is integrally formed on the other structure, or that the structure is "directly" disposed on the other structure, or that the structure is "indirectly" disposed on the other structure through another structure.
[0026] The terms "a", "an", "the", "said" and "at least one" are used to indicate the presence of one or more elements / components / etc.; the terms "including" and "having" are used to express open-ended inclusion and mean that additional elements / components / etc. may be present in addition to the listed elements / components / etc.; the terms "first", "second" and "third" etc. are used only as labels and are not intended to limit the quantity of their objects.
[0027] In the description of the present invention, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.
[0028] The following describes in detail embodiments of the present invention, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this patent, and are not to be construed as limiting the present invention.
[0029] like Figure 1 As shown, a dual three-color laser light source includes: two groups of three-primary-color laser light sources 11, the blue, green, and red light sources of the two groups of three-primary-color laser light sources 11 are respectively arranged opposite to each other, half-wave plates 12 and dichroic mirrors 13 are respectively arranged in sequence on the red light paths of the two groups of three-primary-color laser light sources 11, the half-wave plates 12 are respectively perpendicular to the incident light axes of the light paths, the dichroic mirrors 13 are respectively arranged at 45 degrees to the incident light axes of the light paths, and the dichroic mirrors 13 are red-reflecting and blue-green-transmissive dichroic mirrors 13, first reflectors 14 are respectively arranged on the blue and green light paths of the two groups of three-primary-color laser light sources 11, the first reflectors 14 are respectively arranged at 45 degrees to the incident light axes of the blue and green light paths, the two half-wave plates 12 are parallel, and the two dichroic mirrors 13 and the two first reflectors 14 are respectively perpendicular.
[0030] like Figure 1As shown, the first group of the two groups of three primary color laser light sources 11 is located on the upper side, and the second group is located on the lower side, and the two groups are arranged in parallel, the two groups of three primary color laser light sources 11 are the same in structure, and each includes a substrate, and a red light source, a blue light source and a green light source arranged on the substrate. The left side of the three primary color laser light source 11 on the upper side emits green light and blue light, which is referred to as blue and green light, and the right side emits red light, and the light paths of the blue and green light and the red light are parallel; the left side of the three primary color laser light source 11 on the lower side emits green light and blue light, which is referred to as blue and green light, and the right side emits red light, and the light paths of the blue and green light and the red light are also parallel.
[0031] In the utility model, the half wave plate 12 is arranged behind the red light source of the two groups of three primary color laser light sources 11 respectively; the dichroic mirror 13 is arranged between the two half wave plates 12, is inclined at an angle of 45°, and the two dichroic mirrors are arranged in symmetry at an angle of 90°; the first reflecting mirror 14 is parallel to the dichroic mirror 13.
[0032] The red light rays of the two groups of three primary color laser light sources 11 all pass through the half wave plate 12, change the polarization direction of the red light so as to be consistent with the blue and green light rays, then are reflected by the dichroic mirror 13, and the red light rays change the direction of emission; the blue and green light rays of the two groups of three primary color laser light sources 11 all pass through the first reflecting mirror 14, so that the blue and green light rays change the direction of emission and enter the dichroic mirror 13, and the blue and green light rays are emitted from the dichroic mirror 13; the two groups of three primary color laser light sources 11 are the same in principle, the red, green and blue light rays are converged by parallel stacking, and finally the light rays are emitted from the dichroic mirror 13 and are emitted as near parallel light.
[0033] As shown in the figure, Figures 2-3 A micro LCOS projection optical structure, comprising: the above-mentioned double three-color laser light source, and the light uniformizing part, the illumination part and the imaging part arranged in sequence along the incident direction of the light source. The light emitted by the light source is uniformized, then modulated by the illumination part, and projected by the imaging part to the screen (or wall or other positions) to display images.
[0034] In some preferred embodiments, the light uniformizing part comprises diffusion sheet 21, first compound eye lens 22, first lens 23 and second lens 24 arranged in sequence and perpendicular to the incident optical axis of the light path, and the diffusion sheet 21 receives the emitted light of the two dichroic mirrors 13.
[0035] As shown in the figure, Figure 2 The diffusion sheet 21, the first compound eye lens 22, the first lens 23 and the second lens 24 are arranged in parallel.
[0036] The first compound eye lens 22 is a hexagonal compound eye lens.
[0037] In view of the problem of laser speckle of the laser light source, the red light and the blue and green light of the light source converge and enter the light homogenizing part. The diffusion sheet 21 in the light homogenizing part receives the incident light of the light source, so that the light is uniformly diffused and the influence of speckle on vision is weakened. The uniformly diffused light enters the first compound eye lens 22, is focused on the second compound eye surface through the first compound eye surface of the first compound eye lens 22, and is emitted through the first lens 23 and enters the second lens 24, so as to concentrate the light.
[0038] In some preferred embodiments, the illumination part includes a second compound eye lens 31, a second mirror 32, a third lens 33, a fourth lens 34, a wire grid 35, a retardation sheet 36, an LCOS chip 37 and a polarizer 38 arranged in sequence along the light path, the second compound eye lens 31, the second mirror 32, the third lens 33, the wire grid 35, the retardation sheet 36, the LCOS chip 37 and the polarizer 38 are respectively perpendicular to the incident optical axis of the light path, and the second mirror and the wire grid 35 are respectively at an angle of 45° with the incident optical axis of the light path.
[0039] As shown in Figure 2 , the second compound eye lens 31 is arranged in parallel with the second lens 24 of the light homogenizing part, the second mirror 32 and the wire grid 35 are respectively arranged at an angle of 45° with the second compound eye lens 31, the third lens 33, the fourth lens 34, the retardation sheet 36 and the LCOS chip 37 are respectively arranged perpendicular to the second compound eye lens 31, and the polarizer 38 is arranged in parallel with the second compound eye lens 31.
[0040] The second compound eye lens 3131 is a rectangular compound eye lens.
[0041] As shown in Figure 2 , the light passes through the second compound eye lens 31, which plays a role of homogenizing the laser beam and produces uniform light, and then is reflected by the second mirror 32, which also has the functions of adjusting the light field and color band. The light is incident on the lens group of the third lens 33 and the fourth lens 34, so that the image is reduced to a size close to that of the LCOS chip 37. The wire grid 35 (WG) is between the fourth lens 34 and the retardation sheet 36, which plays a role of PBS, transmits parallel P light and reflects S light. After the light passes through the retardation sheet 36, the polarization is purified, the polarization direction of the laser beam is adjusted and corrected, so as to improve the contrast and color uniformity of the projection picture. The adjusted and corrected laser beam enters the LCOS chip 37, is reflected by the wire grid 35 and enters the polarizer 38, the S light is modulated by the polarizer, and the laser beam enters the imaging part.
[0042] In some preferred embodiments, the imaging part receives the emitted light of the illumination part, and the imaging part includes an imaging lens 42.
[0043] The imaging part further comprises a pixel shaker 41, which is perpendicular to the incident optical axis of the light path, and is arranged between the polarizer 38 and an imaging lens 42, and is arranged in parallel with the polarizer 38.
[0044] The utility model discloses still LCOS projection optical structure adopts double tricolor laser light source, homogenization, illumination part and imaging part, and the overall adoption "U type" architecture can be compatible with other different light source scheme, avoid repeating opening mould, guarantee whole light machine brightness, chromaticity and contrast ratio play better performance, make the whole optical performance be better.
[0045] Finally, it is explained that the above embodiments are only used to illustrate the technical scheme of the utility model and are not limited, and other modifications or equivalent replacements of the technical scheme of the utility model made by the ordinary skilled in the art should be covered in the claim range of the utility model as long as they do not deviate from the spirit and scope of the technical scheme of the utility model.
[0046] The above is only the preferred embodiment of the utility model and is not used to limit the utility model, and the utility model can have various changes and changes for the skilled in the art. Any modification, equivalent replacement, improvement and the like within the spirit and principle of the utility model should be included in the protection range of the utility model.
Claims
1. A dual three-color laser light source, characterized in that: include: Two groups of three-primary-color laser light sources (11), the blue light source, the green light source and the red light source of the two groups of three-primary-color laser light sources (11) are respectively arranged opposite to each other, a half-wave plate (12) and a dichroic mirror (13) are respectively arranged in sequence on the red light path of the two groups of three-primary-color laser light sources (11), the half-wave plate (12) is respectively perpendicular to the incident light axis of the light path, the dichroic mirror (13) is respectively at an angle of 45° to the incident light axis of the light path, the dichroic mirror (13) is a dichroic mirror (13) that reflects red and transmits blue and green, a first reflector (14) is respectively arranged on the blue and green light paths of the two groups of three-primary-color laser light sources (11), the first reflector (14) is respectively at an angle of 45° to the incident light axis of the blue and green light paths, the two half-wave plates (12) are parallel, and the two dichroic mirrors (13) and the two first reflectors (14) are respectively perpendicular.
2. A micro LCOS projection optical structure, characterized by: include: A dual-three-color laser light source as claimed in claim 1, and a light homogenizing unit, an illumination unit and an imaging unit arranged in sequence along the incident direction of the light source.
3. The micro LCOS projection optical structure according to claim 2, wherein: The light homogenizing unit comprises a diffusion sheet (21), a first fly-eye lens (22), a first lens (23) and a second lens (24) which are sequentially arranged and perpendicular to the incident light axis of the light path; the diffusion sheet (21) receives the output light of the two dichroic mirrors (13).
4. The micro LCOS projection optical structure according to claim 3, wherein: The illumination unit comprises a second fly-eye lens (31), a second reflector (32), a third lens (33), a fourth lens (34), a metal wire grid (35), a delay plate (36), an LCOS chip (37) and an analyzer (38) which are sequentially arranged along the optical path. The second fly-eye lens (31), the second reflector (32), the third lens (33), the metal wire grid (35), the delay plate (36), the LCOS chip (37) and the analyzer (38) are respectively perpendicular to the incident optical axis of the optical path, and the second reflector (32) and the metal wire grid (35) are respectively at an angle of 45° to the incident optical axis of the optical path.
5. The micro LCOS projection optical structure according to claim 4, wherein: The imaging unit receives the emitted light from the illumination unit, and the imaging unit includes an imaging lens (42).
6. The micro LCOS projection optical structure according to claim 5, wherein: The imaging unit further includes a pixel dither (41), the pixel dither (41) is perpendicular to the incident light axis of the optical path, and the pixel dither (41) is arranged between the polarizer (38) and the imaging lens (42).