CN114326276B - Color combination lighting device and method thereof, micro-projection light engine and electronic device - Google Patents
Color combination lighting device and method thereof, micro-projection light engine and electronic device Download PDFInfo
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Abstract
一种合色照明装置及其方法、微型投影光引擎以及电子设备。该合色照明装置包括一光源组件、一准直组件以及一合色组件。该光源组件包括多种发光元件，并且该多种发光元件具有不同的发光路径，用于按照颜色时序分时地发射具有不同颜色的多路光束。该准直组件被对应地设置于该光源组件和该合色组件之间的光路中，其中该合色组件包括一反光元件和一驱动机构。该反光元件具有一反射功能面，用于反射该多路光束。该驱动机构被可驱动地连接于该反光元件，用于带动该反光元件偏转以按照该颜色时序将该反射功能面的倾斜角度切换至对应的工作角度，使得经由该准直组件准直后的该多路光束在被该反射功能面反射后沿着同一反光路径传播。
A color combination lighting device and method thereof, a micro-projection light engine and an electronic device. The color combination lighting device includes a light source assembly, a collimation assembly and a color combination assembly. The light source assembly includes a plurality of light-emitting elements, and the plurality of light-emitting elements have different light-emitting paths, and are used to emit multiple light beams with different colors in a time-sharing manner according to a color sequence. The collimation assembly is correspondingly arranged in the light path between the light source assembly and the color combination assembly, wherein the color combination assembly includes a reflective element and a driving mechanism. The reflective element has a reflective functional surface for reflecting the multiple light beams. The driving mechanism is drivably connected to the reflective element, and is used to drive the reflective element to deflect so as to switch the inclination angle of the reflective functional surface to a corresponding working angle according to the color sequence, so that the multiple light beams collimated by the collimation assembly propagate along the same reflective path after being reflected by the reflective functional surface.
Description
Technical Field
The present invention relates to the field of light source illumination, and more particularly, to a color-combining illumination device and method, a micro projection light engine, and an electronic device.
Background
In recent years, with the growing maturity and development of micro display technology, more and more small portable projection media players, projection mobile phones, wearable display devices (such as AR or VR glasses) and other electronic devices are sequentially marketed, so that application modes of the portable projection media players are more diversified, and development prospects are expected. In order to realize a color display of a miniature projection light engine, it is necessary to provide a combined light to it through an illumination system.
Currently, in the full-Color display scheme in the micro-display field, for obtaining better Color expression and wider Color gamut, a relatively independent R, G, B three-way light is generally utilized to perform Color combination and a CS (Color Sequential) circuit is widely adopted, and the full-Color display optical scheme based on Color timing is generally implemented by means of a dichroic mirror. For example, existing illumination systems employ three dichroic mirrors disposed in parallel to combine three primary colors of light from three light paths into the same light path, e.g., chinese patent application No. 201610613057.8 entitled "optical engine for a color projection display". Specifically, the three primary color lights emitted from the parallel light source are modulated into three primary color image lights by the reflective flat panel display, and the three primary color image lights are respectively reflected to three parallel-arranged color-combining mirrors, so that the three primary color image lights are mixed in space by the three color-combining mirrors to form a color image.
However, although the dichroic mirror can make light with corresponding wavelength correspondingly transmit or reflect in a desired direction, the reflectivity or transmittance of the dichroic mirror under corresponding different wavelengths and different light angles will have a certain variability, especially when the angle distribution range of the light is larger and the spectrum range is wider, not only the corresponding color combining effect will be obviously affected, but also the transmission efficiency of the light will be reduced, which will put higher requirements on the film design and processing technology of the dichroic mirror, increase no small difficulty, and correspondingly bring about a great increase in cost.
In addition, for some complex hybrid light source combinations, for example, a light source arrangement based on RGBW four-in-one, the color combination method of the conventional dichroic mirror cannot be well applied.
Disclosure of Invention
The invention provides a color combination lighting device and a method thereof, a miniature projection light engine and an electronic device, which can improve the transmission efficiency of light while realizing the color combination effect.
Another advantage of the present invention is to provide a color-combining illumination device, a method thereof, a micro projection light engine, and an electronic apparatus, wherein in an embodiment of the present invention, the color-combining illumination device can well solve the difference of reflectivity or transmittance of a dichroic mirror corresponding to different wavelengths and different light angles, and is helpful for improving color-combining effect.
Another advantage of the present invention is to provide a color combining illumination device and method, a micro-projection light engine, and an electronic device, wherein in one embodiment of the present invention, the color combining illumination device can meet specific color combining requirements for a wide range of light angles and a wide spectrum, so as to fully cover and well adapt to complex hybrid light source combinations (such as RGBW four-in-one light sources).
Another advantage of the present invention is to provide a color combining illumination device and method, a micro projection light engine, and an electronic device, wherein in an embodiment of the present invention, the color combining illumination device can greatly reduce the design difficulty of a color combining component and improve the realizability of a processing technology under specific color combining requirements for a wide light angle range and a wide spectrum, thereby reducing the cost to a certain extent.
Another advantage of the present invention is to provide a color combining illumination device, a method thereof, a micro projection light engine, and an electronic apparatus, wherein in an embodiment of the present invention, the color combining illumination device can achieve a desired color combining effect by driving a reflective element to deflect and switch correspondingly according to a specified time sequence, and at the same time, can improve the light efficiency to solve a series of problems existing in the conventional dichroic mirror manner.
Another advantage of the present invention is to provide a color combining illumination device and method, a micro-projection light engine, and an electronic device, wherein in an embodiment of the present invention, the color combining illumination device can drive a reflective element to deflect and switch at an oblique angle through a driving mechanism such as a motor, a voice coil motor, or a micro-electromechanical system (MEMS), so as to improve color combining effect.
Another advantage of the present invention is to provide a color-combining illumination device and method, a micro-projection light engine, and an electronic apparatus, wherein in one embodiment of the present invention, the micro-projection light engine is innovative in the wearable field, and can be applied to the traditional projection field as well, and has portability.
Another advantage of the present invention is to provide a color-combining illumination device and method, a miniature projection light engine, and an electronic device, wherein expensive materials or complex structures are not required in the present invention to achieve the above-mentioned objects. The present invention thus successfully and efficiently provides a solution that not only provides a simple color combining illumination device and method, miniature projection light engine and electronic device, but also increases the practicality and reliability of the color combining illumination device and method, miniature projection light engine and electronic device.
To achieve at least one of the above or other advantages and objects, the present invention provides a color mixing illumination device, comprising:
a color-mixing illumination device, comprising:
A light source assembly, wherein the light source assembly comprises a plurality of light emitting elements, and the plurality of light emitting elements have different light emitting paths for time-divisionally emitting a plurality of light beams having different colors according to color timing;
A collimation component for collimating the multiple beams; and
A color combining assembly, wherein the color combining units are correspondingly disposed in the light emitting paths of the plurality of light emitting elements, and the collimating assembly is correspondingly disposed in the light path between the light source assembly and the color combining assembly, wherein the color combining assembly comprises:
a reflecting element, wherein the reflecting element has a reflecting function surface for reflecting the multiple paths of light beams; and
The driving mechanism is drivably connected to the reflecting element and is used for driving the reflecting element to deflect so as to switch the inclination angle of the reflecting functional surface to a corresponding working angle according to the color time sequence, so that the multiple paths of light beams collimated by the collimating component propagate along the same reflecting path after being reflected by the reflecting functional surface of the reflecting element.
According to an embodiment of the present application, the plurality of light emitting elements of the light source assembly include a first light emitting element having a first light emitting path, a second light emitting element having a second light emitting path, and a third light emitting element having a third light emitting path, wherein the light reflecting element is driven by the driving mechanism, so that an inclination angle of the reflecting functional surface of the light reflecting element is correspondingly switched between a first operating angle, a second operating angle, and a third operating angle according to the color timing.
According to an embodiment of the application, the light source component is an RGB three-in-one LED light source.
According to an embodiment of the present application, the first, second and third light emitting elements in the light source assembly are sequentially an R laser light source, a G laser light source and a B laser light source, which are independent from each other.
According to an embodiment of the present application, the collimating component includes a first collimating lens, a second collimating lens and a third collimating lens, wherein the first collimating lens is correspondingly disposed in an optical path between the first light emitting element and the color combining component, and is used for collimating red light emitted by the first light emitting element; wherein the second collimating lenses are correspondingly arranged in the light path between the second light emitting element and the color combining component, for collimating green light emitted via the second light emitting element; wherein the third collimating lenses are correspondingly arranged in the light path between the third light emitting element and the color combining component, for collimating blue light emitted via the third light emitting element.
According to an embodiment of the present application, the plurality of light emitting elements of the light source assembly further includes a fourth light emitting element having a fourth light emitting path, wherein the fourth light emitting element is configured to emit a white light along the fourth light emitting path, and when the fourth light emitting element emits the white light, the light reflecting element of the color combining assembly is driven by the driving mechanism, so that the inclination angle of the reflecting functional surface of the light reflecting element is switched to a fourth operating angle, and the white light propagates along the light reflecting path after being reflected by the reflecting functional surface.
According to an embodiment of the application, the light source assembly is an RGBW four-in-one LED light source.
According to an embodiment of the application, the reflecting element is a plane mirror or a total reflection prism.
According to an embodiment of the application, the driving mechanism is a micro-electromechanical system, a motor, or a voice coil motor.
According to another aspect of the present application, there is further provided a micro-lens light engine comprising:
a relay display system for transmitting illumination light and modulating the illumination light into corresponding image light;
An imaging assembly for projecting the image light from the relay display system for imaging; and
A color-combining illumination device, wherein the color-combining illumination device is configured to provide the illumination light, and the color-combining illumination device comprises:
A light source assembly, wherein the light source assembly comprises a plurality of light emitting elements, and the plurality of light emitting elements have different light emitting paths for time-divisionally emitting a plurality of light beams having different colors according to color timing;
A collimation component for collimating the multiple beams; and
A color combining assembly, wherein the color combining units are correspondingly disposed in the light emitting paths of the plurality of light emitting elements, and the collimating assembly is correspondingly disposed in the light path between the light source assembly and the color combining assembly, wherein the color combining assembly comprises:
a reflecting element, wherein the reflecting element has a reflecting function surface for reflecting the multiple paths of light beams; and
The driving mechanism is drivably connected with the reflecting element and is used for driving the reflecting element to deflect so as to switch the inclination angle of the reflecting functional surface to a corresponding working angle according to the color time sequence, so that the multiple paths of light beams collimated by the collimating component propagate along the same reflecting path after being reflected by the reflecting functional surface of the reflecting element to serve as illumination light;
Wherein the relay display system is correspondingly arranged in the light path between the color combination illumination device and the imaging component, and is used for modulating the illumination light from the color combination illumination device into corresponding image light and transmitting the image light to the imaging component so as to project the image light through the imaging component for imaging.
According to another aspect of the present application, there is further provided an electronic apparatus including:
A waveguide; and
At least one micro-projection light engine, wherein the micro-projection light engine is configured to project image light toward the waveguide to project the image light into a human eye through the waveguide, wherein the micro-lens light engine comprises:
a relay display system for transmitting illumination light and modulating the illumination light into the corresponding image light;
An imaging assembly for projecting the image light from the relay display system for imaging; and a color-combining illumination device, wherein the color-combining illumination device is configured to provide the illumination light, and the color-combining illumination device comprises:
A light source assembly, wherein the light source assembly comprises a plurality of light emitting elements, and the plurality of light emitting elements have different light emitting paths for time-divisionally emitting a plurality of light beams having different colors according to color timing;
A collimation component for collimating the multiple beams; and
A color combining assembly, wherein the color combining units are correspondingly disposed in the light emitting paths of the plurality of light emitting elements, and the collimating assembly is correspondingly disposed in the light path between the light source assembly and the color combining assembly, wherein the color combining assembly comprises:
a reflecting element, wherein the reflecting element has a reflecting function surface for reflecting the multiple paths of light beams; and
The driving mechanism is drivably connected with the reflecting element and is used for driving the reflecting element to deflect so as to switch the inclination angle of the reflecting functional surface to a corresponding working angle according to the color time sequence, so that the multiple paths of light beams collimated by the collimating component propagate along the same reflecting path after being reflected by the reflecting functional surface of the reflecting element to serve as illumination light;
Wherein the relay display system is correspondingly arranged in the light path between the color combining illumination device and the imaging component, and is used for modulating the illumination light from the color combining illumination device into corresponding image light and transmitting the corresponding image light to the imaging component so as to project the image light to the waveguide through the imaging component.
Further objects and advantages of the present invention will become fully apparent from the following description and the accompanying drawings.
These and other objects, features and advantages of the present invention will become more fully apparent from the following detailed description, the accompanying drawings and the appended claims.
Drawings
Fig. 1 is a block diagram of a color combining illumination device according to an embodiment of the invention.
Fig. 2 is a schematic state switching diagram of the color combining illumination device according to the above embodiment of the present invention.
Fig. 3 shows a schematic plan view of a light source assembly of the color combining illumination device according to the above embodiment of the present invention.
Fig. 4 shows a first variant of the color-combining illumination device according to the above-described embodiment of the invention.
Fig. 5A, 5B and 6 show a second variant of the color-combining illumination device according to the above-described embodiment of the invention.
Fig. 7 shows a third variant of the color-combining illumination device according to the above-described embodiment of the invention.
FIG. 8 is a block diagram of a miniature projection light engine according to an embodiment of the present invention.
Fig. 9 shows a schematic structural diagram of the micro-projection light engine according to the above embodiment of the present invention.
Fig. 10A is a schematic diagram of an electronic device according to an embodiment of the invention.
Fig. 10B is a schematic diagram of another electronic device according to an embodiment of the invention.
Fig. 11 is a schematic flow chart of a color combination illumination method of a color combination illumination device according to an embodiment of the invention.
Detailed Description
The following description is presented to enable one of ordinary skill in the art to make and use the invention. The preferred embodiments in the following description are by way of example only and other obvious variations will occur to those skilled in the art. The basic principles of the invention defined in the following description may be applied to other embodiments, variations, modifications, equivalents, and other technical solutions without departing from the spirit and scope of the invention.
It will be appreciated by those skilled in the art that in the present disclosure, the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," etc. refer to an orientation or positional relationship based on that shown in the drawings, which is merely for convenience of description and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore the above terms should not be construed as limiting the present invention.
In the present invention, the terms "a" and "an" in the claims and specification should be understood as "one or more", i.e. in one embodiment the number of one element may be one, while in another embodiment the number of the element may be plural. The terms "a" and "an" are not to be construed as unique or singular, and the term "the" and "the" are not to be construed as limiting the amount of the element unless the amount of the element is specifically indicated as being only one in the disclosure of the present invention.
In the description of the present invention, it should be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In the description of the present invention, unless explicitly stated or limited otherwise, the terms "connected," "connected," and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through a medium. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
In recent years, with the advent of micro display chip technology, miniaturization and high resolution projection display have become possible. However, in order to realize color display, the existing illumination system of the miniature projection light engine generally adopts a dichroic mirror to combine three primary colors into one combined color light to irradiate the corresponding display unit. However, although the dichroic mirror can make light with corresponding wavelength correspondingly transmit or reflect in a desired direction, the reflectivity or transmittance of the dichroic mirror under corresponding different wavelengths and different light angles will have a certain variability, especially when the angle distribution range of the light is larger and the spectrum range is wider, not only the corresponding color combining effect will be obviously affected, but also the transmission efficiency of the light will be reduced, which will put higher requirements on the film design and processing technology of the dichroic mirror, increase no small difficulty, and correspondingly bring about a great increase in cost. In addition, for some complex hybrid light source combinations, for example, a light source arrangement based on RGBW four-in-one, the color combination method of the conventional dichroic mirror cannot be well applied. Therefore, in order to solve the above-mentioned problems, the present application provides a color-combining illumination device and method, a micro projection light engine and an electronic device, which can improve the light transmission efficiency while achieving the color-combining effect.
Referring to fig. 1 to 3 of the drawings, a color-mixing illumination device according to an embodiment of the present invention is illustrated. Specifically, as shown in fig. 1 and 2, the color combining illumination device 1 may include a light source assembly 10, a collimation assembly 20, and a color combining assembly 30, wherein the collimation assembly 20 is correspondingly disposed in the light path between the light source assembly 10 and the color combining assembly 30.
As shown in fig. 2, the light source assembly 10 includes a plurality of light emitting elements 110, and the plurality of light emitting elements 110 have different light emitting paths 100 for time-divisionally emitting multiple light beams having different colors in accordance with color timing. The collimating component 20 is correspondingly disposed on the light emitting paths 100 of the plurality of light emitting elements 110, and is configured to collimate the multiple light beams from the plurality of light emitting elements 110.
As shown in fig. 1 and 2, the color combining assembly 30 may include a reflecting element 31 and a driving mechanism 32, where the reflecting element 31 has a reflecting functional surface 310 for reflecting the collimated multiple light beams; the driving mechanism 32 is drivingly connected to the reflecting element 31, and is configured to drive the reflecting element 31 to deflect so as to switch the inclination angle of the reflecting functional surface 310 to a corresponding working angle according to the color sequence, so that the multiple light beams collimated by the collimating component 20 propagate along the same reflecting path 300 after being emitted by the reflecting functional surface 310, thereby achieving the desired color combining effect.
It should be noted that, since the multiple light emitting elements 110 of the light source assembly 10 emit multiple light beams with different colors in a time-sharing manner according to the color sequence, and the color combining assembly 30 can correspondingly switch the inclination angle of the reflecting functional surface 310 of the reflecting element 31 to the working angle according to the color sequence, the multiple light beams with different colors all propagate along the same reflecting path 300 after being emitted by the reflecting functional surface 310 of the reflecting element 31, so that the multiple light beams with different colors can achieve the corresponding color combining effect only by using the reflection of the reflecting functional surface 310 of the reflecting element 31, without reducing the light transmission efficiency due to the difference of the reflectivity or the transmissivity as in the conventional dichroic mirror.
More specifically, the operation angle of the reflective functional surface 310 of the reflective element 31 of the present application depends on the relative positional relationship of the plurality of light emitting elements 110 of the light source assembly 10, the parameters and positions of the corresponding light emitting paths 100 and the collimating assembly 20, and the switching frequency of the operation angle of the reflective functional surface 310 matches the color timing of the light source assembly 10. In other words, when the inclination angle of the reflecting functional surface 310 of the reflecting element 31 is equal to the corresponding operating angle, the reflecting functional surface 310 enables the corresponding light emitting path 100 and the same light reflecting path 300 to satisfy the law of reflection, that is, the light beam propagating along the corresponding light emitting path 100 propagates along the light reflecting path 300 after being emitted through the reflecting functional surface 310.
Illustratively, as shown in fig. 2, the plurality of light emitting elements 110 of the light source assembly 10 may include a first light emitting element 111 having a first light emitting path 101, a second light emitting element 112 having a second light emitting path 102, and a third light emitting element 113 having a third light emitting path 103, wherein the first light emitting element 111 is configured to emit a first path of monochromatic light along the first light emitting path 101, the second light emitting element 112 is configured to emit a second path of monochromatic light along the second light emitting path 102, and the third light emitting element 113 is configured to emit a third path of monochromatic light along the third light emitting path 103. It is understood that, as shown in fig. 3, the first, second and third paths of monochromatic light have different colors, for example, the first, second and third paths of monochromatic light may be implemented as red light (R), green light (G) and blue light (B), but not limited thereto; of course, in other examples of the present application, the first path of monochromatic light, the second path of monochromatic light, and the third path of monochromatic light may be implemented as monochromatic light of other colors, so long as the requirement of color combining effect can be met, which is not described in detail in the present application.
In detail, as shown in fig. 2, the light reflecting element 31 can be driven by the driving mechanism 32, so that the inclination angle of the reflecting functional surface 310 is correspondingly switched among the first working angle θ 1, the second working angle θ 2 and the third working angle θ 3 according to the color sequence. For example, when the first light emitting element 111 of the light source assembly 10 emits the first monochromatic light along the first light emitting path 101, the light reflecting element 31 is driven by the driving mechanism 32 to make the inclination angle of the reflecting functional surface 310 equal to the first working angle θ 1, and at this time, the first monochromatic light will propagate along the light reflecting path 300 of the color combining assembly 30 after being reflected by the reflecting functional surface 310; when the second light emitting element 112 of the light source assembly 10 emits the second monochromatic light along the second light emitting path 102, the light reflecting element 31 is driven by the driving mechanism 32 to make the inclination angle of the reflecting functional surface 310 equal to the second working angle θ 2, and at this time, the second monochromatic light will propagate along the light reflecting path 300 of the color combining assembly 30 after being reflected by the reflecting functional surface 310; when the third light emitting element 113 of the light source assembly 10 emits the third monochromatic light along the third light emitting path 103, the light reflecting element 31 is driven by the driving mechanism 32, so that the inclination angle of the reflecting functional surface 310 is equal to the third working angle θ 3, and at this time, the third monochromatic light will propagate along the light reflecting path 300 of the color combining assembly 30 after being reflected by the reflecting functional surface 310.
In the above-described embodiment of the present application, as shown in fig. 2 and 3, the light source assembly 10 may be, but not limited to, implemented as an RGB three-in-one LED light source, and the first, second and third light emitting elements 111, 112 and 113 in the light source assembly 10 are linearly arranged in a straight line. Of course, in other examples of the present application, the light source assembly 10 may be implemented as other types of light sources, such as a laser light source, and the arrangement of the first, second, and third light emitting elements 111, 112, 113 in the light source assembly 10 may be implemented as an L-shaped arrangement.
As shown in fig. 2, the collimating assembly 20 may be, but is not limited to, implemented as a collimating lens group 21, wherein the collimating lens group 21 corresponds to the first light emitting element 111, the second light emitting element 112, and the third light emitting element 113 of the light source assembly 10 at the same time, such that the first monochromatic light, the second monochromatic light, and the third monochromatic light emitted by the first light emitting element 111, the second light emitting element 112, and the third light emitting element 113 are reflected by the reflective functional surface 310 of the reflective element 31 after being collimated by the collimating lens group 21, so as to propagate along the reflective path 300.
According to the above embodiment of the present application, as shown in fig. 1, the driving mechanism 32 of the color combining component 30 of the color combining lighting device 1 may be, but is not limited to, implemented as a micro-electromechanical system (MEMS) 321, so as to deflect the reflective element 31 through the MEMS 321, so that the inclination angle of the reflective functional surface 310 of the reflective element 31 is switched between the corresponding working angles. Of course, in other examples of the present application, the driving mechanism 32 of the color combining component 30 may be implemented as a mechanism such as a motor 322 or a voice coil motor 323, as long as the reflecting element 31 can be driven to deflect, so that the inclination angle of the reflecting functional surface 310 is switched between the corresponding working angles, which is not described in detail herein.
As shown in fig. 2, the reflecting element 31 of the color combining component 30 of the color combining illumination device 1 may be, but is not limited to, implemented as a plane mirror 311 for reflecting the multiple light beams collimated by the collimating component 20.
Preferably, the reflecting surface of the plane mirror 311 is coated with a high reflection film, so that the reflecting capability of the reflecting functional surface 310 of the reflecting element 31 is improved, which is helpful for further improving the light transmission efficiency. It is understood that the high-reflection film may be implemented as, but is not limited to, a film layer such as a metal film or a dielectric film, etc.
Fig. 4 shows a first variant of the color-combining illumination device 1 according to the above-described embodiment of the application. The color-combining illumination device 1 according to this variant embodiment of the application differs from the above-described embodiment according to the application in that: the reflecting element 31 of the color combining component 30 may be implemented as a total reflection prism 312, so as to reflect the multiple light beams collimated by the collimating component 20 by using the total internal reflection condition of the total reflection prism 312, thereby achieving the desired color combining effect. It can be appreciated that in this modification of the present application, the reflecting functional surface 310 of the reflecting element 31 is implemented as a slope of the total reflection prism 312, and the reflecting capability can be better without plating any highly reflective film on the slope of the total reflection prism 312, which helps to improve the light transmission efficiency.
Fig. 5A, 5B and 6 show a second variant of the color-combining illumination device 1 according to the above-described embodiment of the application. The color-combining illumination device 1 according to this variant embodiment of the application differs from the above-described embodiment according to the application in that: as shown in fig. 5A and 5B, the plurality of light emitting elements 110 of the light source assembly 10 further includes a fourth light emitting element 104 having a fourth light emitting path, wherein the fourth light emitting element 114 is configured to emit a white light along the fourth light emitting path 104. Accordingly, the inclination angle of the reflective functional surface 310 of the reflective element 31 of the color combining component 30 can be further switched to a fourth operating angle θ 4, wherein when the fourth light-emitting element 114 of the light source component 10 emits the white light along the fourth light-emitting path 104, the reflective element 31 is driven by the driving mechanism 32 so that the inclination angle of the reflective functional surface 310 is equal to the fourth operating angle θ 4, and the white light propagates along the reflective path 300 of the color combining component 30 after being reflected by the reflective functional surface 310.
Preferably, as shown in fig. 6, the light source assembly 10 is implemented as an RGBW four-in-one LED light source.
As shown in fig. 6, four light emitting elements R, G, B, W are arranged in an array, and an optical axis of the collimating lens group 21 of the collimating component 20 passes through a midpoint between the R light emitting element and the G light emitting element of the light source component 10 (i.e. an intersection point of axis1 and axis 2), wherein the deflection angles of the reflecting functional surface 310 of the reflecting element 31 corresponding to red light (R) and green light (G) are respectively the first working angle θ 1 and the second working angle θ 2, which can be achieved by performing corresponding angle rotations of the reflecting element 31 in a YZ plane around an X axis; the third working angle θ 3 (corresponding to the B light-emitting element) and the fourth working angle θ 4 (corresponding to the W light-emitting element) are respectively implemented by the reflective element 31 deflecting again by an angle epsilon in the XY plane around the Z axis on the basis of the first working angle θ 1 and the second working angle θ 2, that is, the third working angle θ 3 and the fourth working angle θ 4 of the reflective element 31 are compound angles, which have angle components in the YZ plane and the XY plane.
Fig. 7 shows a third variant of the color-combining illumination device 1 according to the above-described embodiment of the application. The color-combining illumination device 1 according to this variant embodiment of the application differs from the above-described embodiment according to the application in that: the plurality of light emitting elements 110 of the light source assembly 10 are implemented as a plurality of monochromatic laser light sources (i.e., LD light sources) independent of each other, so that the light source assembly 10 requires a plurality of collimating lenses to respectively collimate multiple light beams emitted via the monochromatic laser light sources. In other words, the collimating assembly 20 may include a plurality of collimating lenses 22 independent of each other, wherein the collimating lenses 22 are respectively disposed in the optical paths between the monochromatic laser light sources of the light source assembly 10 and the color combining assembly 30.
Illustratively, as shown in fig. 7, the first, second, and third light emitting elements 111, 112, 113 in the light source assembly 10 may be sequentially implemented as mutually independent R laser light sources 111', G laser light sources 112', and B laser light sources 113' (i.e., the light source assembly 10 is a mutually independent RGB three-color laser light source), and a first collimating lens 221 in the collimating assembly 20 is correspondingly disposed in an optical path between the R laser light sources 111' and the color combining assembly 30 for collimating red light emitted via the R laser light sources 111 '; a second collimating lens 222 of the collimating assembly 20 is correspondingly disposed in the optical path between the G laser light source 112 'and the color combining assembly 30, for collimating green light emitted via the G laser light source 112'; the third collimating lens 223 in the collimating component 20 is correspondingly disposed in the optical path between the B laser source 113 'and the color combining component 30, for collimating the blue light emitted via the B laser source 113'.
According to another aspect of the present invention, as shown in fig. 8 and 9, an embodiment of the present invention further provides a micro projection light engine configured with the above color combining illumination device 1 for projection for imaging. Specifically, as shown in fig. 8 and 9, the micro-projection light engine includes the above color combination illumination device 1, a relay display system 2, and an imaging component 3. The color-combining illumination device 1 is configured to emit illumination light having different colors along the light reflection path 300. The relay display system 2 is correspondingly arranged in the light path between the color combination illumination device 1 and the imaging assembly 3, and is used for modulating the illumination light from the color combination illumination device 1 into image light to be transmitted to the imaging assembly 3, wherein the imaging assembly 3 is used for projecting the image light for imaging. It will be appreciated that the relay display system 2 may be implemented as any type of relay system, as long as it is ensured that the relay system 2 is capable of modulating the illumination light from the color combining illumination device 1 into light carrying image information (i.e. image light) and transmitting the image light to the imaging assembly 3, which the present invention is not limited in any way.
It should be noted that, as shown in fig. 9, the imaging assembly 3 of the micro-projection light engine of the present invention may include an imaging lens group for shaping the image light from the relay display system 2 to project an image with higher imaging quality. Of course, in other examples of the invention, the imaging assembly 3 of the miniature projection light engine may be implemented as any other type of imaging system, as long as it is ensured that the imaging assembly 3 can project the image light from the relay display system 2, which is not further limited by the invention.
According to another aspect of the invention, the invention further provides an electronic device configured with the miniature projection light engine. Specifically, as shown in fig. 10A and 10B, the electronic device includes a waveguide 4 and any of the foregoing micro-projection light engines, where the micro-projection light engines are configured to project image light onto the waveguide 4 to project the image light into a human eye through the waveguide 4.
It is noted that in fig. 10A, the micro-projection light engine and human eye are located on the same side of the waveguide 4. Of course, in another example of the present invention, as shown in fig. 10B, the micro-projection light engine and the human eye may be located on opposite sides of the waveguide 4 (i.e., different sides of the waveguide 4), and the projection of the image light into the human eye can be implemented as well, which is not limited in this aspect of the present invention, and only needs to ensure that the image light from the micro-projection light engine is projected into the human eye through the waveguide 4. Furthermore, it will be appreciated by those skilled in the art that the type of the near-eye display device is not limited, and for example, the near-eye display device may be a head-mounted display device such as AR glasses or the like.
According to another aspect of the present application, as shown in fig. 11, the present application further provides a color combining illumination method of a color combining illumination device, including the steps of:
s100: time-sharing emitting multiple paths of light beams with different colors according to color time sequence; and
S200: and driving a reflecting element to deflect so as to switch the inclination angle of the reflecting functional surface of the reflecting element to a corresponding working angle, so that the multipath light beams propagate along the same reflecting path to serve as illumination light after being reflected by the reflecting functional surface of the reflecting element.
It should be noted that, in an example of the present application, as shown in fig. 11, the color combining illumination method of the color combining illumination device may further include the steps of:
S300: the multiple beams are collimated prior to being reflected by the reflective functional surface.
It will be appreciated by persons skilled in the art that the embodiments of the invention described above and shown in the drawings are by way of example only and are not limiting. The objects of the present invention have been fully and effectively achieved. The functional and structural principles of the present invention have been shown and described in the examples and embodiments of the invention may be modified or practiced without departing from the principles described.
Claims (11)
1. A color-mixing illumination device, comprising:
A light source assembly, wherein the light source assembly comprises a plurality of light emitting elements, and the plurality of light emitting elements have different light emitting paths for time-divisionally emitting a plurality of light beams having different colors according to color timing;
A collimation component for collimating the multiple beams; and
A color combining assembly, wherein the color combining assembly is correspondingly disposed in the light emitting path of the plurality of light emitting elements, and the collimating assembly is correspondingly disposed in the light path between the light source assembly and the color combining assembly, wherein the color combining assembly comprises:
a reflecting element, wherein the reflecting element has a reflecting function surface for reflecting the multiple paths of light beams; and
The driving mechanism is drivably connected to the reflecting element and is used for driving the reflecting element to deflect so as to switch the inclination angle of the reflecting functional surface to a corresponding working angle according to the color time sequence, so that the multiple paths of light beams collimated by the collimating component propagate along the same reflecting path after being reflected by the reflecting functional surface of the reflecting element.
2. The color-combining illumination device as claimed in claim 1, wherein the plurality of light emitting elements of the light source assembly includes a first light emitting element having a first light emitting path, a second light emitting element having a second light emitting path, and a third light emitting element having a third light emitting path, wherein the light reflecting element is driven by the driving mechanism such that an inclination angle of the reflecting functional surface of the light reflecting element is correspondingly switched between a first operating angle, a second operating angle, and a third operating angle according to the color timing.
3. The color combining illumination device of claim 2, wherein the light source assembly is an RGB three-in-one LED light source.
4. The color mixing illumination device according to claim 2, wherein the first, second and third light emitting elements in the light source assembly are, in order, an R laser light source, a G laser light source and a B laser light source, which are independent of each other.
5. The color combining illumination device of claim 4, wherein the collimating assembly comprises a first collimating lens, a second collimating lens, and a third collimating lens, wherein the first collimating lens is disposed in the optical path between the first light emitting element and the color combining assembly, respectively, for collimating red light emitted via the first light emitting element; wherein the second collimating lenses are correspondingly arranged in the light path between the second light emitting element and the color combining component, for collimating green light emitted via the second light emitting element; wherein the third collimating lenses are correspondingly arranged in the light path between the third light emitting element and the color combining component, for collimating blue light emitted via the third light emitting element.
6. The color mixing illumination device according to claim 2, wherein the plurality of light emitting elements of the light source assembly further comprises a fourth light emitting element having a fourth light emitting path, wherein the fourth light emitting element is configured to emit a white light along the fourth light emitting path, and when the fourth light emitting element emits the white light, the light reflecting element of the color mixing assembly is driven by the driving mechanism, so that the inclination angle of the reflecting functional surface of the light reflecting element is switched to a fourth operating angle, and the white light propagates along the light reflecting path after being reflected by the reflecting functional surface.
7. The color combining illumination device of claim 6, wherein the light source assembly is an RGBW four-in-one LED light source.
8. The color combining illumination device of any of claims 1-7, wherein the light reflecting element is a planar mirror or a total reflection prism.
9. The color combining illumination device of any of claims 1-7, wherein the driving mechanism is a microelectromechanical system, a motor, or a voice coil motor.
10. A miniature projection light engine, comprising:
a relay display system for transmitting illumination light and modulating the illumination light into corresponding image light;
An imaging assembly for projecting the image light from the relay display system for imaging; and
A color-combining illumination device, wherein the color-combining illumination device is configured to provide the illumination light, and the color-combining illumination device comprises:
A light source assembly, wherein the light source assembly comprises a plurality of light emitting elements, and the plurality of light emitting elements have different light emitting paths for time-divisionally emitting a plurality of light beams having different colors according to color timing;
A collimation component for collimating the multiple beams; and
A color combining assembly, wherein the color combining assembly is correspondingly disposed in the light emitting path of the plurality of light emitting elements, and the collimating assembly is correspondingly disposed in the light path between the light source assembly and the color combining assembly, wherein the color combining assembly comprises:
a reflecting element, wherein the reflecting element has a reflecting function surface for reflecting the multiple paths of light beams; and
The driving mechanism is drivably connected with the reflecting element and is used for driving the reflecting element to deflect so as to switch the inclination angle of the reflecting functional surface to a corresponding working angle according to the color time sequence, so that the multiple paths of light beams collimated by the collimating component propagate along the same reflecting path after being reflected by the reflecting functional surface of the reflecting element to serve as illumination light;
Wherein the relay display system is correspondingly arranged in the light path between the color combination illumination device and the imaging component, and is used for modulating the illumination light from the color combination illumination device into corresponding image light and transmitting the image light to the imaging component so as to project the image light through the imaging component for imaging.
11. An electronic device, comprising:
A waveguide; and
At least one micro-projection light engine, wherein the micro-projection light engine is configured to project image light toward the waveguide to project the image light into a human eye through the waveguide, wherein the micro-projection light engine comprises:
a relay display system for transmitting illumination light and modulating the illumination light into the corresponding image light;
An imaging assembly for projecting the image light from the relay display system for imaging; and
A color-combining illumination device, wherein the color-combining illumination device is configured to provide the illumination light, and the color-combining illumination device comprises:
A light source assembly, wherein the light source assembly comprises a plurality of light emitting elements, and the plurality of light emitting elements have different light emitting paths for time-divisionally emitting a plurality of light beams having different colors according to color timing;
A collimation component for collimating the multiple beams; and
A color combining assembly, wherein the color combining assembly is correspondingly disposed in the light emitting path of the plurality of light emitting elements, and the collimating assembly is correspondingly disposed in the light path between the light source assembly and the color combining assembly, wherein the color combining assembly comprises:
a reflecting element, wherein the reflecting element has a reflecting function surface for reflecting the multiple paths of light beams; and
The driving mechanism is drivably connected with the reflecting element and is used for driving the reflecting element to deflect so as to switch the inclination angle of the reflecting functional surface to a corresponding working angle according to the color time sequence, so that the multiple paths of light beams collimated by the collimating component propagate along the same reflecting path after being reflected by the reflecting functional surface of the reflecting element to serve as illumination light;
Wherein the relay display system is correspondingly arranged in the light path between the color combining illumination device and the imaging component, and is used for modulating the illumination light from the color combining illumination device into corresponding image light and transmitting the corresponding image light to the imaging component so as to project the image light to the waveguide through the imaging component.
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| CN111487837A (en) * | 2019-01-25 | 2020-08-04 | 舜宇光学（浙江）研究院有限公司 | Miniature projection light engine based on D L P technology |
| CN111435215A (en) * | 2019-01-11 | 2020-07-21 | 舜宇光学（浙江）研究院有限公司 | Compact miniature projection light engine |
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