CN216133291U - Illumination system and projection apparatus - Google Patents
Illumination system and projection apparatus Download PDFInfo
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- CN216133291U CN216133291U CN202121480917.8U CN202121480917U CN216133291U CN 216133291 U CN216133291 U CN 216133291U CN 202121480917 U CN202121480917 U CN 202121480917U CN 216133291 U CN216133291 U CN 216133291U
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Abstract
The application discloses lighting system and projection equipment belongs to projection technical field. The illumination system includes: an optical path assembly, a prism assembly, and a 0.65 inch digital micromirror device. The light path component can guide the received light beams to the prism component, the prism component can guide the light beams provided by the light path component to the digital micromirror device, the included angle between one side of the rectangular light receiving area of the digital micromirror device and the target projection is 45 degrees, and the 0.65-inch digital micromirror device can process more light rays, so that the brightness of the projection display picture of the illumination system is higher, the problem of lower brightness of the projection display picture of the illumination system in the related technology can be solved, and the effect of improving the brightness of the projection display picture of the illumination system is realized.
Description
Technical Field
The present application relates to the field of projection technologies, and in particular, to an illumination system and a projection apparatus.
Background
The laser projection display technology is a novel projection display technology in the current market, and has the characteristics of high picture contrast, clear imaging, bright color and higher brightness compared with an LED projection product, and the remarkable characteristics gradually enable the laser projection display technology to become a mainstream development direction in the market. A light valve (DMD for short) is a digital micromirror device, and the DMD includes a plurality of reflectors capable of rotating between two positions, which can be an open position and a closed position, and the light beam emitted from the DMD can be controlled by the rotating reflectors.
An illumination system for a projection device includes a 0.47 inch DMD.
Currently, the brightness of the projection display image of the illumination system in the related art is low.
SUMMERY OF THE UTILITY MODEL
The embodiment of the application provides an illumination system and a projection device. The technical scheme is as follows:
according to an aspect of the present application, there is provided a lighting system comprising: the optical path component, the prism component and the 0.65-inch digital micro-mirror device are sequentially arranged along the optical path direction of the illumination system;
the optical path assembly is configured to guide the received light beams to the prism assembly, the prism assembly is configured to guide the light beams provided by the optical path assembly to the digital micro-mirror device, the digital micro-mirror device is provided with a rectangular light receiving area, an included angle between one side of the rectangular light receiving area and a target projection is 45 degrees, and the target projection is an orthographic projection of a main optical axis of a first light beam emitted to the digital micro-mirror device by the prism assembly on a plane where the rectangular light receiving area is located.
Optionally, an included angle between a plane in which the rectangular light receiving region is located and the first light beam is 78 degrees.
Optionally, the prism assembly includes an entrance prism, the entrance prism is surrounded by an entrance surface, a reflection surface and an exit surface, the optical path assembly is located outside the entrance surface, the digital micromirror device is located outside the exit surface, the entrance surface is configured to receive the light beam provided by the optical path assembly and guide the received light beam to the reflection surface, the reflection surface is configured to reflect the received light beam to the exit surface, and an included angle between the reflection surface and the rectangular light receiving area satisfies the following formula:
θ1＝β-arcsin[(sin12°)/n1)]+arcsin[(sinα)/n1)]；
wherein β is an angle between the incident surface of the incident prism and the reflection surface, α is an angle between the incident beam of the incident surface and the normal, and n1Is the refractive index of the light entrance prism.
Optionally, the optical path component includes a light uniformizing component and a reflector, the light uniformizing component is configured to receive a light beam and guide the light beam to the reflector, and the reflector is configured to guide the received light beam to the prism component.
Optionally, the light path subassembly still includes the lens subassembly, the lens subassembly includes first lens, second lens and third lens, first lens with the second lens is located the income light side of speculum, the third lens is located the light-emitting side of speculum, first lens is used for receiving the light beam that even light subassembly provided, just the primary optical axis of first lens with the primary optical axis of the light beam that even light subassembly provided has the target contained angle.
Optionally, a main optical axis of the first lens is rotated by a first included angle from a state parallel to the main optical axis of the dodging assembly in a counterclockwise direction, where the first included angle satisfies the following formula:
θ2<arcsin(2L/D)；
wherein, theta2The first included angle is L, the distance from the light outlet of the light homogenizing assembly to the axis of the first lens is L, and the diameter of the first lens is D.
Optionally, the third lens is glued to the prism assembly.
Optionally, the light entrance prism satisfies the following formula:
β+arcsin[(sinα)/n1)]≥θ3；
wherein, theta3The critical angle for total reflection.
Optionally, the illumination system further comprises a galvanometer assembly located between the digital micromirror device and the prism assembly.
According to another aspect of the application, a projection device is provided, comprising an illumination system as described above.
The beneficial effects brought by the technical scheme provided by the embodiment of the application at least comprise:
an illumination system is provided that includes an optical path assembly, a prism assembly, and a 0.65 inch digital micromirror device arranged in that order along an optical path of the illumination system. The light path component can guide the received light beams to the prism component, the prism component can guide the light beams provided by the light path component to the digital micromirror device, the included angle between one side of the rectangular light receiving area of the digital micromirror device and the target projection is 45 degrees, and the 0.65-inch digital micromirror device can process more light rays, so that the brightness of the projection display picture of the illumination system is higher, the problem of lower brightness of the projection display picture of the illumination system in the related technology can be solved, and the effect of improving the brightness of the projection display picture of the illumination system is realized.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an illumination system provided in an embodiment of the present application;
FIG. 2 is a schematic diagram of a digital micromirror device in the illumination system shown in FIG. 1;
FIG. 3 is a schematic diagram of a digital micromirror device and a prism assembly in the illumination system shown in FIG. 1;
FIG. 4 is a schematic structural view of a dodging assembly and a first lens in the illumination system shown in FIG. 1;
FIG. 5 is a schematic diagram of a structure of a light-entering prism in the illumination system shown in FIG. 1;
fig. 6 is a partial structural schematic diagram of another illumination system shown in the embodiment of the present application.
With the above figures, there are shown specific embodiments of the present application, which will be described in more detail below. These drawings and written description are not intended to limit the scope of the inventive concepts in any manner, but rather to illustrate the inventive concepts to those skilled in the art by reference to specific embodiments.
Detailed Description
To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
The digital micromirror device can be regarded as an optical switch composed of a plurality of micro mirrors, namely, the optical switch is opened and closed by utilizing the rotating micro mirrors, the number of the mirror pieces is determined by the display resolution, one small mirror piece corresponds to one pixel, and the micro mirrors are the minimum working units and are also the key for influencing the performance of the micro mirrors. The micro-mirrors are very small but still have a complex mechanical structure different from liquid crystal-each micro-mirror has a separate support frame and performs positive or negative n degrees (n > 0) deflection around the hinge tilt axis. Two electrodes are arranged at two corners of the micro mirror, and the deflection of the micro mirror can be controlled by voltage.
The micro-mirror works by means of reflected light, when the micro-mirror is in an open State (English: On State, namely the micro-mirror deflects by + n degrees), namely the incident angle of incident light (light source) reaches n degrees, and the reflection angle also reaches n degrees (the sum of the incident angle and the reflection angle is 2n degrees), at the moment, the energy of the light which can be received by the lens is maximum; if the micro-mirror is deflected to the Off State (i.e., the micro-mirror deflects by-n degrees), the energy of the light received by the lens is minimum, and the brightness is minimum.
However, the DMD of 0.47 inches in the related art causes the luminance of the projection display screen of the illumination system to be low.
The embodiment of the application provides an illumination system and a projection device, which can solve the problems in the related art.
As shown in fig. 1, fig. 1 is a schematic structural diagram of an illumination system provided in an embodiment of the present application, where the illumination system includes: an optical path assembly 11, a prism assembly 12 and a 0.65 inch digital micromirror device 13 are sequentially arranged along the optical path direction of the illumination system.
The optical path assembly 11 is configured to direct the received light beams to the prism assembly 12, and the prism assembly 12 is configured to direct the light beams provided by the optical path assembly 11 to the digital micromirror device 13.
As shown in fig. 2, fig. 2 is a schematic structural diagram of the dmd in the illumination system shown in fig. 1, which is viewed along a first direction, and the first direction f1 may be perpendicular to a plane where the display surface of the dmd 13 is located. The digital micro-mirror device 13 has a rectangular light-receiving area 131, an included angle c between one side b of the rectangular light-receiving area and the target projection s1 is 45 degrees, and the target projection s1 is an orthogonal projection of a main optical axis of a first light beam emitted by the prism assembly to the digital micro-mirror device on a plane where the rectangular light-receiving area 131 is located. Therefore, the first light beam emitted to the digital micro-mirror device can be completely incident to the rectangular light receiving area of the digital micro-mirror device and can be matched with the angle of the micro-mirror of the digital micro-mirror device.
In summary, the present application provides an illumination system including an optical path component, a prism component and a 0.65 inch digital micromirror device, which are sequentially arranged along an optical path direction of the illumination system. The light path component can guide the received light beams to the prism component, the prism component can guide the light beams provided by the light path component to the digital micromirror device, the included angle between one side of the rectangular light receiving area of the digital micromirror device and the target projection is 45 degrees, and the 0.65-inch digital micromirror device can process more light rays, so that the brightness of the projection display picture of the illumination system is higher, the problem of lower brightness of the projection display picture of the illumination system in the related technology can be solved, and the effect of improving the brightness of the projection display picture of the illumination system is realized.
Optionally, as shown in fig. 3, fig. 3 is a schematic structural diagram of a digital micromirror device and a prism assembly in the illumination system shown in fig. 1, and an included angle e between a plane where the rectangular light receiving region is located and the first light beam s is 78 degrees, so that the first light beam s can meet the light entrance requirement of the digital micromirror device and can match the rotation angle of a micromirror of the digital micromirror device, and the first light beam s can be processed by the digital micromirror device and then output to the prism assembly 12.
Optionally, as shown in fig. 3, the prism assembly 12 includes an incident prism 121, the incident prism 121 is surrounded by an incident surface P1, a reflecting surface P2 and an exit surface P3, the optical path assembly is located outside the incident surface P1, the digital micromirror device 13 is located outside the exit surface P3, the incident surface P1 is configured to receive the light beam provided by the optical path assembly and guide the received light beam to the reflecting surface P2, the reflecting surface P2 is configured to reflect the received light beam to the exit surface P3, and an included angle between the reflecting surface P3 and the rectangular light receiving area satisfies the following formula:
θ1＝β-arcsin[(sin12°)/n1)]+arcsin[(sinα)/n1)]；
wherein, beta is the included angle between the incident surface and the reflecting surface of the incident prism, alpha is the included angle between the incident beam of the incident surface and the normal line, and n1The refractive index of the light-entering prism is the included angle theta between the first light beam s exiting the prism assembly and the normal of the light-exiting surface P34Is 12 degrees.
So that the illumination light beam irradiated to the reflective surface P3 can be reflected to the dmd 13, and the image light beam processed by the dmd can exit the light prism through the reflective surface P3.
Alternatively, as shown in fig. 1, the light path assembly 11 includes a dodging assembly 111 and a mirror 112, the dodging assembly 111 is used for receiving the light beam and guiding the light beam to the mirror 112, and the mirror 112 is used for guiding the received light beam to the prism assembly 12. In this way, the reflector 112 can deflect the direction of the light beam emitted by the dodging component 111, so as to shorten the length of the illumination system along the direction of the main optical axis, and the size of the illumination system can be reduced. The reflector 112 can realize the height adjustment of the illumination system by increasing the distance from the prism assembly 12 and simultaneously reducing the distance from the dodging assembly 111 without changing the transmission direction of the light beam, so that an installation space can be reserved for components such as a fixed bracket, a heat sink and the like in the illumination system.
The light homogenizing component can be a light guide pipe or a fly eye lens and can be used for shaping and homogenizing laser spots incident from the light source. Beam homogenization refers to the shaping of a beam with uneven intensity distribution into a beam with uniform cross-section distribution through beam transformation. Laser speckle refers to the interference of light beams to form bright or dark spots, creating random grainy intensity patterns, when a laser light source is used to illuminate a rough surface such as a screen or any other object that produces diffuse reflection or diffuse transmission.
The light guide pipe can be a tubular device formed by splicing four plane reflection sheets, namely a hollow light guide pipe, light rays are reflected for multiple times in the light guide pipe to achieve the effect of light uniformization, the light guide pipe can also be a solid light guide pipe, the light inlet and the light outlet of the light guide pipe are rectangular with uniform shapes and areas, light beams enter from the light inlet of the light guide pipe and then are emitted from the light outlet of the light guide pipe, and light beam homogenization and laser spot optimization are completed in the process of passing through the light guide pipe. The fly-eye lens is generally formed by combining a series of small lenses, two rows of fly-eye lens arrays are arranged in parallel to divide light spots of an input light beam, and the divided light spots are accumulated through a subsequent focusing lens, so that the light beam is homogenized and the light spots are optimized.
Optionally, as shown in fig. 1, the light path assembly 11 further includes a lens assembly 113, where the lens assembly 113 includes a first lens 1131, a second lens 1132 and a third lens 1133, the first lens 1131 and the second lens 1132 are located on the light incident side of the reflector 112, and the third lens 1133 is located on the light emergent side of the reflector 112.
The effective focal length of the first lens 1131 is F1, the effective focal length of the second lens 1132 is F2, and the effective focal length of the third lens 1133 is F3.
The effective focal length F1 of the first lens 1131 satisfies the formula: 0.05< | F1/F | < 0.5;
the effective focal length F2 of the second lens 1132 satisfies the formula: 0.1< | F2/F | < 0.5;
the effective focal length F3 of the third lens 1133 satisfies the formula: 0.1< | F3/F | < 0.5.
Where F is the effective focal length of the illumination system, which is a measure of the concentration or divergence of light in the optical system, and refers to the distance from the center of the lens to the focal point of the light concentration. In this embodiment of the present application, the focal lengths of the first lens 1131, the second lens 1132 and the third lens 1133 satisfy the above formula, and the effective focal length of the lenses may be in other ranges.
The first lens 1131, the second lens 1132 and the third lens 1133 may be spherical lenses, and compared with an aspheric lens which is difficult to manufacture, the spherical lens is easier to process, so that the difficulty in manufacturing the lighting system is reduced.
As shown in fig. 4, fig. 4 is a schematic structural diagram of the light unifying assembly and the first lens in the illumination system shown in fig. 1, the first lens 1131 is configured to receive the light beam provided by the light unifying assembly 111, and a principal optical axis h1 of the first lens 1131 has a target included angle with a principal optical axis h2 of the light beam provided by the light unifying assembly 111.
Alternatively, as shown in fig. 4, the main optical axis h1 of the first lens 1131 is rotated by a first included angle in the counterclockwise direction from the state of being parallel to the main optical axis h2 of the dodging assembly 111, and the first included angle satisfies the following formula:
θ2<arcsin(2*L/D)；
wherein, theta2Is a first included angle, L is the distance from the light outlet of the light uniformizing assembly to the axis of the first lens, and D is the diameter of the first lens.
The first lens 1131 is disposed obliquely with respect to the main optical axis h2 of the dodging assembly 111 and can be used to compensate for the optical path. The second spherical lens 1132 can be placed perpendicular to the optical axis of the illumination system, and can be used to further converge the light beam and reduce the spot size. The third spherical lens 1133 may be disposed perpendicular to the optical axis of the illumination system, which may balance the optical path length of the field of view and reduce the spot size.
Alternatively, as shown in FIG. 1, the third lens 1133 is glued to the prism assembly 12, which can reduce the size of the space between the third lens 1133 and the prism assembly 12, and thus can reduce the size of the illumination system. The third lens 1133 may be a plano-convex lens.
Alternatively, as shown in fig. 5, fig. 5 is a schematic structural diagram of the light entrance prism in the illumination system shown in fig. 1, and the light entrance prism 121 satisfies the following formula:
β+arcsin[(sinα)/n1)]≥θ3；
wherein β is an angle between the incident surface P1 of the incident prism 121 and the reflection surface P2, α is an angle between the incident beam of the incident surface P1 and the normal, and θ3Is the critical angle of total reflection, n1Is the refractive index of the entrance prism 121.
The light-entering prism 121 may be a Total internal reflection prism (TIR), which is an optical phenomenon that when a light ray passes through two media with different refractive indexes, part of the light ray is refracted at an interface of the media, and the rest is reflected, but when an incident angle is larger than a critical angle (the light ray is far from a normal), the light ray stops entering another interface, and is totally reflected to an inner surface.
Alternatively, as shown in fig. 6, fig. 6 is a partial structural schematic diagram of another illumination system shown in the embodiment of the present application, the illumination system further includes a galvanometer assembly 14, and the galvanometer assembly 14 is located between the digital micro-mirror device 13 and the prism assembly 12.
The galvanometer assembly 14 may include an optical lens and a driving component, wherein the driving component can drive the optical lens to continuously swing with a preset rotation axis, and the optical lens can change the direction of the light beam accordingly. Realize the dislocation projection of the image light beam output by the digital micro-mirror device 13. That is, the mirror assembly 14 can shift the image by high frequency vibration, so that the illumination system can realize higher resolution display.
For example, when the light beam incident on the galvanometer assembly is a parallel light beam (that is, the incident angle of each light ray in the light beam is the same), after the optical lens in the galvanometer assembly swings from one position to another position, the shift distances of each pixel of the projection image corresponding to the image light beam are all equal, so that the offsets of each field of view in the projection lens to the projection screen are consistent, and thus, the high-resolution display of the visual picture can be ensured. Wherein the offset of the field of view refers to the actual displacement distance of the field of view. The imaging offset mirror group is arranged between the light valve and the prism assembly in the illumination system, so that the 4k resolution can be realized through the vibration of the mirror vibrating assembly, and the system design difficulty is reduced.
In summary, the present application provides an illumination system including an optical path component, a prism component and a 0.65 inch digital micromirror device, which are sequentially arranged along an optical path direction of the illumination system. The light path component can guide the received light beams to the prism component, the prism component can guide the light beams provided by the light path component to the digital micromirror device, the included angle between one side of the rectangular light receiving area of the digital micromirror device and the target projection is 45 degrees, and the 0.65-inch digital micromirror device can process more light rays, so that the brightness of the projection display picture of the illumination system is higher, the problem of lower brightness of the projection display picture of the illumination system in the related technology can be solved, and the effect of improving the brightness of the projection display picture of the illumination system is realized.
According to another aspect of the present application, there is provided a projection device comprising the illumination system of any of the above embodiments.
The laser projection device can include a light source assembly, an illumination system, and a projection lens. The light source assembly can comprise a laser light source, an emergent light beam is transmitted to the illumination system, the light beam is processed by the illumination system and then emits an image light beam, and the image light beam enters the projection lens and is emitted out of the laser projection equipment by the projection lens.
Alternatively, the illumination system in the laser projection apparatus may refer to the illumination system provided in the above embodiment, and includes an optical path component, a prism component and a 0.65-inch digital micromirror device, which are sequentially arranged along the optical path direction of the illumination system.
In summary, embodiments of the present application provide a laser projection apparatus including a light source assembly, an illumination system and a projection lens, wherein the illumination system includes a light path assembly, a prism assembly and a 0.65 inch digital micromirror device along the illumination system. The light path component can guide the received light beams to the prism component, the prism component can guide the light beams provided by the light path component to the digital micromirror device, the included angle between one side of the rectangular light receiving area of the digital micromirror device and the target projection is 45 degrees, and the 0.65-inch digital micromirror device can process more light rays, so that the brightness of the projection display picture of the illumination system is higher, the problem of lower brightness of the projection display picture of the illumination system in the related technology can be solved, and the effect of improving the brightness of the projection display picture of the illumination system is realized.
In this application, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The term "plurality" means two or more unless expressly limited otherwise.
The above description is only exemplary of the present application and should not be taken as limiting, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (10)
1. An illumination system, characterized in that the illumination system comprises an optical path component, a prism component and a 0.65-inch digital micro-mirror device which are arranged in sequence along the optical path direction of the illumination system;
the optical path assembly is configured to guide the received light beams to the prism assembly, the prism assembly is configured to guide the light beams provided by the optical path assembly to the digital micro-mirror device, the digital micro-mirror device is provided with a rectangular light receiving area, an included angle between one side of the rectangular light receiving area and a target projection is 45 degrees, and the target projection is an orthographic projection of a main optical axis of a first light beam emitted to the digital micro-mirror device by the prism assembly on a plane where the rectangular light receiving area is located.
2. The illumination system of claim 1, wherein an angle between a plane in which the rectangular light receiving region is located and the first light beam is 78 degrees.
3. The illumination system of claim 2, wherein the prism assembly comprises an entrance prism, the entrance prism is defined by an entrance surface, a reflection surface and an exit surface, the optical path assembly is located outside the entrance surface, the dmd is located outside the exit surface, the entrance surface is configured to receive the light beam provided by the optical path assembly and direct the received light beam to the reflection surface, the reflection surface is configured to reflect the received light beam to the exit surface, and an included angle between the reflection surface and the rectangular light-receiving area satisfies the following formula:
θ1＝β-arcsin[(sin12°)/n1)]+arcsin[(sinα)/n1)]；
wherein β is an angle between the incident surface of the incident prism and the reflection surface, α is an angle between the incident beam of the incident surface and the normal, and n1Is the refractive index of the light entrance prism.
4. The illumination system of claim 2 wherein the light path assembly comprises a dodging assembly for receiving the light beam and directing the light beam to the mirror, and a mirror for directing the received light beam to the prism assembly.
5. The illumination system of claim 4, wherein the light path assembly further comprises a lens assembly, the lens assembly comprises a first lens, a second lens and a third lens, the first lens and the second lens are located on the light incident side of the reflector, the third lens is located on the light emergent side of the reflector, the first lens is used for receiving the light beam provided by the light homogenizing assembly, and a target included angle exists between a main optical axis of the first lens and a main optical axis of the light beam provided by the light homogenizing assembly.
6. The illumination system of claim 5, wherein the primary optical axis of the first lens is rotated from being parallel to the primary optical axis of the dodging assembly by a first included angle in a counter-clockwise direction, the first included angle satisfying the following formula:
θ2<arcsin(2L/D)；
wherein, theta2The first included angle is L, the distance from the light outlet of the light homogenizing assembly to the axis of the first lens is L, and the diameter of the first lens is D.
7. The illumination system of claim 5 wherein the third lens is glued to the prism assembly.
8. The illumination system of claim 3, wherein the light entrance prism satisfies the following formula:
β+arcsin[(sinα)/n1)]≥θ3；
wherein, theta3The critical angle for total reflection.
9. An illumination system according to any of claims 1-6, further comprising a galvanometer assembly, the galvanometer assembly being positioned between the digital micromirror device and the prism assembly.
10. A projection device comprising an illumination system as claimed in any one of the claims 1 to 9.
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| CN202121480917.8U CN216133291U (en) | 2021-06-30 | 2021-06-30 | Illumination system and projection apparatus |
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| CN202121480917.8U CN216133291U (en) | 2021-06-30 | 2021-06-30 | Illumination system and projection apparatus |
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