CN114764210A

CN114764210A - Projection device

Info

Publication number: CN114764210A
Application number: CN202110048288.XA
Authority: CN
Inventors: 杜玉楠
Original assignee: Qingdao Hisense Laser Display Co Ltd
Current assignee: Qingdao Hisense Laser Display Co Ltd
Priority date: 2021-01-14
Filing date: 2021-01-14
Publication date: 2022-07-19

Abstract

The application discloses projection equipment belongs to the technical field of projection. The projection equipment comprises a first light source, a second light source, a light guide pipe and a light valve, wherein the first light source, the second light source, the light guide pipe and the light valve are arranged along a light path, the first light source and the second light source are arranged in a superposition mode along a first direction, a long edge of the cross section of the light guide pipe is parallel to the first direction, and a short edge of the cross section of the light guide pipe is parallel to a short edge of a display surface of the light valve. The corresponding placing positions of the first light source, the second light source, the light guide pipe and the light valve are set, and the combination of the double light sources and the single light valve is adopted, so that the projection equipment can achieve higher resolution and brightness by using fewer optical elements, and the volume of the projection equipment is reduced. The problem of the large size of projection equipment among the correlation technique is solved, the effect of reducing the size of projection equipment has been reached.

Description

Projection equipment

Technical Field

The application relates to the technical field of projection, in particular to projection equipment.

Background

The laser projection technology is a new projection display technology which is rapidly developed in recent years, and has the advantages of high picture contrast, clear imaging, bright color, high brightness and the like, so the laser projection technology has become the mainstream development direction in the market. The resolution of a projection device in laser projection technology is an important factor affecting the wide application of laser projection technology.

Currently, a projection device includes two light source assemblies, an illumination assembly, two light valves, and a lens assembly. The light beam that the light source subassembly sent shoots illumination assembly, illumination assembly leads to two light valves after handling the light beam, and then leads the light beam to the camera lens subassembly through two light valves. The resolution and brightness of the projection equipment can be improved by matching the double light sources and the double light valves.

However, the projection apparatus described above has many components, which may result in a large size of the projection apparatus, and it is difficult to satisfy the requirement of light weight of the projection apparatus.

Disclosure of Invention

The embodiment of the application provides a projection device. The technical scheme is as follows:

according to a first aspect of the present application, there is provided a projection apparatus, comprising a light source assembly, a light engine illumination system, and a lens assembly arranged in sequence along a light path;

the light source assembly comprises a first light source and a second light source, and the first light source and the second light source are placed in a superposition mode along a first direction;

the light machine illumination system comprises a light guide pipe, an illuminating mirror group and a light valve, wherein the light valve is provided with a rectangular display surface, the cross section of the light guide pipe is rectangular, the long side of the cross section is parallel to the first direction, and the short side of the cross section is parallel to the short side of the display surface of the light valve.

Optionally, the long side of the cross-section is perpendicular to the display surface of the light valve.

Optionally, the lighting mirror group includes first lens, second lens and the third lens that set gradually along the light path, first lens reach the primary optical axis of second lens with the axis of light pipe is parallel, the primary optical axis of third lens with there is the contained angle between the display surface.

Optionally, an included angle between a main optical axis of the third lens and the display surface is less than or equal to 34 degrees.

Optionally, the optical-mechanical illumination system further includes an tir prism and a compensating prism, the tir prism is a right-angle prism, the right-angle prism includes two mutually perpendicular first and second surfaces, and an inclined surface connected to the first and second surfaces, and the compensating prism is glued to the inclined surface of the tir prism.

Optionally, the compensation prism comprises a wedge prism, and the third lens is cemented with the compensation prism.

Optionally, the optical-mechanical illumination system further includes an tir prism, the tir prism is a right-angle prism, the right-angle prism includes two mutually perpendicular first and second faces, and an inclined plane connected to the first and second faces, and the third lens is glued to the inclined plane of the tir prism.

Optionally, the light source assembly further includes a light combining piece and a diffusion assembly, the light combining piece is located on the light emitting side of the first light source and the light emitting side of the second light source, the diffusion assembly is located on the light emitting side of the light combining piece, and the diffusion assembly includes a diffusion wheel or a diffusion sheet.

Optionally, the light engine illumination system further comprises a reflector located between the second lens and the third lens.

Optionally, the projection device further comprises a galvanometer, the galvanometer being located between the lens assembly and the tir prism.

The beneficial effects brought by the technical scheme provided by the embodiment of the application at least comprise:

the projection equipment comprises a first light source, a second light source, a light guide pipe and a light valve, wherein the first light source, the second light source, the light guide pipe and the light valve are arranged along a light path, the first light source and the second light source are arranged in a superposition mode along a first direction, the long side of the cross section of the light guide pipe is parallel to the first direction, and the short side of the cross section of the light guide pipe is parallel to the short side of the display surface of the light valve. The corresponding placing positions of the first light source, the second light source, the light guide pipe and the light valve are set, and the combination of the double light sources and the single light valve is adopted, so that the projection equipment can achieve higher resolution and brightness by using fewer optical elements, and the volume of the projection equipment is reduced. The problem that the size of the projection equipment is large in the related art is solved, and the effect of reducing the size of the projection equipment is achieved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a projection apparatus provided in an embodiment of the present application;

FIG. 2 is a perspective view of an illumination assembly of the projection device shown in FIG. 1;

FIG. 3 is a left side view of the projection device shown in FIG. 1;

FIG. 4 is a comparative illustration of an inverted total internal reflection prism assembly provided by an embodiment of the present application;

FIG. 5 is a schematic diagram of a structure in which a third lens is cemented with a compensating prism according to an embodiment of the present disclosure;

FIG. 6 is a diagram illustrating a third lens cemented with an inverted TIR prism according to an embodiment of the present disclosure.

Specific embodiments of the present application have been shown by way of example in the drawings and 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.

Fig. 1 is a schematic structural diagram of a projection apparatus provided in an embodiment of the present disclosure, and as shown in fig. 1, the projection apparatus includes a light source assembly 11, an optical engine illumination system 12, and a lens assembly 13, which are sequentially disposed along a light path. The optical-mechanical illumination system 12 is located between the light source assembly 11 and the lens assembly 13, the light source assembly 11 emits light beams, and the optical-mechanical illumination system 12 receives the light beams and processes the light beams, so as to guide the light beams to the lens assembly 13.

The light source assembly 11 includes a first light source 111 and a second light source 112, and the first light source 111 and the second light source 112 are stacked along the first direction y. The first and second light sources 111 and 112 may be laser light sources, which may include one or more lasers.

The optical-mechanical illumination system 12 includes a light pipe 121, an illumination lens set 122 and a light valve 123. The light guide tube 121 (also called a light homogenizing rod) is used for homogenizing and shaping the light beam emitted by the light source assembly 11, and emitting the shaped light beam to the illumination mirror group 122. Meanwhile, the length direction z of the light guide 121 is parallel to the direction of the outgoing light beam of the light source assembly 11. The illumination mirror group 122 is used for refracting and converging the light beams, and then emitting the processed light beams to the light valve 123. The light valve 123 is configured to modulate the received light beam and emit the modulated light beam, and the lens assembly 13 is configured to receive the light beam and cooperate with other elements to perform imaging.

Fig. 2 is a perspective view of the illumination assembly of the projection apparatus shown in fig. 1, and as shown in fig. 2, the light valve 123 has a rectangular display surface, the light guide 121 has a rectangular cross section, a long side a of the cross section is parallel to the first direction y, and a short side b of the cross section is parallel to a short side c of the display surface of the light valve 123. With such a structure, the spot shape of the light beam emitted through the light guide 121 is made to fit the shape of the display surface of the light valve 123 as much as possible.

To sum up, the embodiment of the present application provides a projection device, and this projection device includes first light source, second light source, light pipe and a light valve that place along the light path, and first light source and second light source are placed along first direction stack, and the long limit of the cross section of light pipe is parallel with first direction, and the minor face is parallel with the minor face of the display surface of light valve. The corresponding placing positions of the first light source, the second light source, the light guide pipe and the light valve are set, and the combination of the double light sources and the single light valve is adopted, so that the projection equipment can achieve higher resolution and brightness by using fewer optical elements, and the volume of the projection equipment is reduced. The problem of the large size of projection equipment among the correlation technique is solved, the effect of reducing the size of projection equipment has been reached.

Optical-mechanical lighting system

Alternatively, referring to fig. 2, the long side a of the cross section is perpendicular to the display surface of the light valve 123. In this structure, when the light beam shaped by the light guide 121 enters the light valve 123 through the lens and other elements, the light spot of the light beam is attached to the display surface of the light valve 123 as much as possible, that is, the longer side of the light spot corresponds to the longer side of the display surface of the light valve 123, and the shorter side corresponds to the shorter side of the display surface of the light valve 123. So that the light spot is uniformly covered on the display surface of the light valve 123, thereby reducing the waste of light energy and improving the light utilization efficiency of the projection apparatus.

Meanwhile, the resolution of the projection equipment can be effectively improved, and a high-resolution and high-brightness projection picture is output.

The light valve may include a digital micro-mirror device (DMD for short), and may digitally modulate light. The digital micromirror device may include an array of high-speed digital light-reflecting micromirrors corresponding to light rays in the projected image that reproduce the image substantially when the micromirrors cooperate with the digital signal, light source, and projection lens.

The micro electrodes under each micro mirror are activated through digital signals, the micro electrodes can push the mirror surfaces of the micro mirrors to face or avoid a light source, when the mirror surfaces of the micro mirrors face the light source (namely, the micro mirrors are in an open state), a white pixel point can be reflected to a screen in the projection equipment through the lens assembly, and when the mirror surfaces of the micro mirrors avoid the light source (namely, the micro mirrors are in a closed state), the positions of the pixels of the micro mirrors on the screen are dark. Therefore, the number of small mirrors in the light valve, one for each pixel, determines the display resolution of the light valve. For an exemplary 4K resolution light valve, the micro mirror array arrangement may be 4096 × 2160. In an embodiment of the present application, the size of the light valve in the projection system may be 0.98 inches.

In the embodiment of the present application, the operation process of the digital micromirror device may include: the micromirrors reflect light by rotating, and the rotation of each micromirror is controlled by a micro-electrode located under each micromirror. At the same time, each micromirror reflects one color during one rotation. For example, the micromirror projecting the purple pixel is only responsible for projecting red and blue light (red light and blue light combined into purple light) on the screen, and the micromirror projecting the orange pixel is only responsible for reflecting red and green light proportionally (red light is higher and green light is lower) on the screen. Because the opening and closing speed of the micro-mirror surface is high, light is projected to the screen through the lens assembly, three color lights which are quickly flickered are mixed together by human visual organs, and clear images can be seen on the screen due to the phenomenon of vision persistence.

Optionally, the illumination mirror group 122 includes a first lens 1221, a second lens 1222, and a third lens 1223 sequentially disposed along the light path, a primary optical axis of the first lens 1221 and a primary optical axis of the second lens 1223 are parallel to an axis of the light guide 121, and an included angle exists between a primary optical axis of the third lens 1223 and the display surface of the light valve 123. The primary optical axis of the lens is the axis passing through the optical center of the lens and perpendicular to the lens, as shown in fig. 1, the primary optical axis of the first lens 1221 and the primary optical axis of the second lens 1222 are coincident, and the primary optical axes of the two lenses are parallel to the axis of the light guide 121.

The first lens 1221 is configured to receive the light beam emitted by the light source module and perform convergence and collimation on the light beam, and the second lens 1222 is configured to receive the light beam emitted by the first lens 1221 and further converge the light beam, so that the light spot size of the light beam emitted by the second lens 1222 is smaller. In addition, as shown in fig. 2, the third lens 1223 is disposed at an angle, that is, an included angle exists between a main optical axis of the third lens 1223 and the display surface of the light valve 123, so that the optical paths of the fields of view in the projection apparatus can be balanced, and a better projection effect can be achieved.

The first lens 1221 may be a spherical lens or an aspheric lens; the second lens 1222 may be a spherical lens or an aspherical lens; the third lens 1223 may be a spherical lens or an aspherical lens. The specific lens specification is selected and not limited herein.

Alternatively, fig. 3 is a left side view of the projection apparatus shown in fig. 1, and some components are omitted from fig. 3 for clarity, and as shown in fig. 3, an included angle α between the main optical axis k of the third lens 1223 and the display surface s is less than or equal to 34 degrees. With such a structure, the included angle α between the main optical axis k of the third lens 1223 and the display surface s of the light valve 123 is controlled within a certain range, so that the third lens 1223 can better exert the effect of balancing the optical path of the field of view, and the projection apparatus can further exhibit a better projection effect. Meanwhile, the distance of the projection device in the first direction (namely the direction perpendicular to the display panel of the light valve) y is shortened, and the thickness of the whole projection device is further reduced.

Optionally, as shown in fig. 1 and 3, the optical illumination system 12 further includes an inverted tir prism 124 and a compensating prism 125, the inverted tir prism 124 may be a right-angle prism, the right-angle prism includes two first and second faces m1 and m2 perpendicular to each other, and an inclined plane m3 connected to the first and second faces m1 and m2, and the compensating prism 125 is glued to the inclined plane m3 of the inverted tir prism 124. In the projection apparatus, after receiving the light beam emitted from the light source assembly 11, the first lens 1221 directs the light beam to the second lens 1222, the second lens 1222 directs the received light beam to the third lens 1223, the light beam converged by the first lens 1221 and the second lens 1222 enters the third lens 1223, the third lens 1223 directs the light beam to the compensating prism 125, the compensating prism 125 reduces the spot size of the light beam and directs the light beam to the tir prism 124, and then the tir prism 124 outputs the light beam to the light valve 123, and then the light valve 123 reflects the light beam to the tir prism 124, and directs the light beam to the lens assembly 13 through the tir prism 124. Meanwhile, the reduction of the size of the tir prism 124 is beneficial to shortening the working distance behind the lens assembly, and reducing the size of the lens, so that the whole size of the projection device is smaller, and the appearance is more attractive, light and thin.

Alternatively, as shown in fig. 3, the tir prism (abbreviated as RTIR) is an isosceles right triangular prism, wherein an inclined plane m3 of the isosceles right triangular prism is a light incident plane for receiving an incident light beam, and the tir prism 124 may guide the light beam emitted from the compensating prism 125 to the light valve 123 and then guide the light beam reflected from the light valve 123 to the lens assembly 13, so as to implement the projection function.

In addition, when the tir prism is used for illumination, what is implemented in the illumination light path is a refraction function that can refract light incident on the prism onto the light valve; when the reverse total internal reflection prism is used for an ultra-short focus lens system, the reverse total internal reflection prism totally reflects the light reflected by the light valve to the lens, so that the light energy can be saved, and the high-efficiency conversion of the light energy is realized.

The optical-mechanical illumination system 12 further includes an tir prism 124 and a compensating prism 125, wherein the compensating prism 125 is glued to the inclined plane m3 of the tir prism 124, and the specific connection manner of the embodiment of the present application is not limited herein.

Fig. 4 is a comparison diagram of an tir prism assembly according to an embodiment of the present invention, as shown in fig. 4, in which the dashed-line prism is an tir prism a, the dashed-line light beam is a light beam path directly entering the tir prism, and h1 is a length required for the slope of the tir prism to receive the light beam. In the figure, the solid line frame prism is a combined prism of the compensating prism G and the inverted total internal reflection prism a1, the light beam emitted from the third lens firstly enters the compensating prism G, the compensating prism G reduces the spot size of the incident light beam and refracts the light beam, the light beam with the reduced spot size and the changed light path direction through refraction enters the inverted total internal reflection prism a1, h2 is the length required when the compensating prism G is combined with the inverted total internal reflection prism a1 to receive the light beam, and h1 is larger than h 2. And the volume of A1 is less than the volume of A, so, through the compensation prism and the reverse total internal reflection prism matching, the light path is refracted, the area of the reverse total internal reflection prism for receiving the light beam is reduced, the size of the reverse total internal reflection prism can be reduced, and the overall size of the projection equipment is further reduced.

Furthermore, the higher the refractive index of the compensating prism, the smaller the size of the inverted tir prism may be. The refractive index of the compensation prism is related to the material of the compensation prism, and the specific material is not limited in the embodiment of the present application.

Alternatively, fig. 5 is a schematic structural diagram of a third lens cemented with a compensating prism according to an embodiment of the present disclosure, and as shown in fig. 5, the compensating prism 125 includes a wedge-shaped prism, and the third lens 1223 is cemented with the compensating prism 124. The compensating prism 124 may be a wedge-shaped prism, so that the size of the tir prism 124 can be further reduced, and the overall size of the projection apparatus can be controlled, so that the projection apparatus is lighter and simpler in appearance, and the practicability and the attractiveness of the projection apparatus are enhanced.

When the included angle between the main optical axis of the third lens 1223 and the display surface of the light valve 123 is 34 degrees, the third lens 1223 may be directly glued to the light incident surface of the compensation prism 124, that is, the light emitting surface of the third lens 1223 is attached to the light incident surface of the compensation prism, the third lens 1223 guides the light beam to the compensation prism, the compensation prism 125 reduces the light spot size of the light beam and guides the light beam to the tir prism 124, and then the tir prism 124 outputs the light beam to the light valve 123, and the light valve 123 reflects the light beam to the tir prism 124, and the tir prism 124 guides the light beam to the lens assembly. The light emitting surface of the third lens 1223 is overlapped with the light incident surface of the compensating prism 125, the light beam emitted from the third lens 123 can directly enter the compensating prism 124, and the light beam is further processed by the compensating prism 124.

Optionally, fig. 6 is a schematic structural diagram of a third lens cemented with an tir prism provided in this embodiment of the application, as shown in fig. 6, the optical illumination system 12 further includes the tir prism 124, the tir prism is a right-angle prism, the right-angle prism includes two first and second faces m1 and m2 perpendicular to each other, and an inclined plane m3 connected to the first and second faces m1 and m2, and the third lens 1223 is cemented with an inclined plane m3 of the tir prism 124. That is, the light emitting surface of the third lens 1223 is attached to the light incident surface of the tir prism 124. When the light beam exits through the light-emitting surface of the third lens 1223, the light beam can directly enter the light-in surface of the tir prism 124. Meanwhile, the tir prism 124 is glued with the third lens 1223, so that optical elements in the projection device are further simplified, and the optical path distance is shortened, so that the projection device has a small overall size and a light and beautiful appearance.

Optionally, referring to fig. 1, the light source assembly 11 further includes a light combining piece 113 and a diffusion assembly 114, the light combining piece 113 is located on the light emitting side of the first light source 111 and the second light source 112, the diffusion assembly 114 is located on the light emitting side of the light combining piece 113, and the diffusion assembly 114 includes a diffusion wheel or a diffusion sheet.

Speckle phenomena (speckle phenomena refers to an object illuminated by a light beam, and the surface of the object presents a granular structure) can occur due to the light beam emitted by the light source. The light beam has high coherence, so when the light beam is reflected from the surface of the object, the vibration from each point on the object to the observation point is coherent, the light field of the observation point is the superposition of coherent sub-waves emitted by each point on the rough surface, and because the roughness of the rough surface is greater than the wavelength of the light beam, the phases of the sub-beams emitted by each point of the object reaching the observation point are in a random distribution state, the coherent superposition generates a speckle pattern, and the intensity of the speckle pattern is distributed randomly. In the embodiment of the present application, the diffusion component may be a diffusion wheel or a diffusion sheet, and is used for homogenizing the light beam to reduce the uneven energy distribution of the light beam spot.

The rotating diffusion wheel can generate random phases to the light beam in space, so that interference can be caused to coherence of the light beam, and the phenomenon that light spots of the light beam are distributed unevenly is reduced.

As shown in fig. 1, the light beams emitted from the first light source 111 and the second light source 112 are combined by the light combining member 113. The first light source 111 and the second light source 112 are stacked along the first direction, the light beams emitted from the two light sources are combined at the light emitting side through the light combining piece 113, and the light combining piece 113 can perform uniform combination processing on the light beams emitted from the first light source 111 and the second light source 112, and effectively improve the brightness of the light beams after light combination. The high-quality light beam can be matched with other optical devices in the projection equipment, and the projection effect with high brightness and high resolution can be achieved.

The diffusion component 114 is located at the light-emitting side of the light-combining component 113, so that the light beam emitted from the light-combining component 113 can be further optimized to obtain a higher-quality light beam.

Optionally, the optical engine illumination system 12 further includes a reflector 126, and the reflector 126 is located between the second lens 1221 and the third lens 1223. As shown in fig. 1, the reflecting mirror 126 is used for receiving the light beam emitted from the second lens 1221 and guiding the light beam to the third lens 1223, wherein the reflecting mirror 126 is a plane mirror. In the projection device, the reflector 126 is also used for turning the light path, so that the size of the projection device in the length direction of the light guide pipe is smaller, the volume of the projection device can be further reduced, and the requirement of light weight can be met.

Optionally, the mirror 126 is angled at 45 degrees to the axis of the light pipe. With such a structure, the reflector 126 can turn the optical axis of the optical mechanical illumination system 12 by 90 degrees, so as to shorten the dimension of the optical mechanical illumination system 12 in the length direction z of the light guide, further reduce the dimension of the projection apparatus in the length direction z of the light guide as much as possible, further reduce the volume of the projection apparatus and expand the application range thereof.

Optionally, the projection apparatus further comprises a galvanometer 127, the galvanometer 127 being located between the lens assembly 13 and the inverted total internal reflection prism 124. In the projection apparatus, after light beams emitted from the first light source 111 and the second light source 112 pass through the light combining member 113 and go forward, the light beams are emitted from the light emitting side of the light combining member 113 to the diffusing member 114, the diffusing member 114 performs light homogenizing treatment on the light beams and guides the light beams to the first lens 1221, the first lens 1221 receives the light beams emitted from the diffusing member 114, performs converging treatment on the light beams and guides the light beams to the second lens 1222, the second lens 1222 further converges the received light beams and guides the light beams to the third lens 1223, then the third lens 1223 guides the light beams to the compensating prism 125, the compensating prism 125 reduces the spot size of the light beams and guides the light beams to the tir prism 124, and then the tir prism 124 outputs the light beams to the light valve 123, and the light valve 123 reflects the modulated light beams to the tir prism 124 and guides the light beams to the vibrating mirror 127, the galvanometer 127 vibrates at a predetermined frequency such that the light beams passing through the galvanometer 127 are misaligned and superimposed and then enter the lens assembly.

The galvanometer 127 may include an optical lens and a driving component, the driving component may drive the optical lens to continuously swing around a preset rotation axis, and the optical lens may change the direction of the light beam accordingly, where the optical lens may be a flat glass.

For example, when the light beam incident on the galvanometer 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 swings from one position to another position, the shift distance of each pixel of the projection image corresponding to the image light beam is equal, so that the offsets of the projection screen from the respective view fields in the projection lens are the same, and thus, the high-resolution display of the visual picture can be ensured. The offset of the field of view refers to the actual displacement distance of the field of view, so the light beam emitted from the galvanometer is parallel light. Meanwhile, the light valve with the resolution of 4k is matched, the 4k resolution can be converted into the 8k resolution through the high-frequency vibration of the vibrating mirror, and the system can be designed with the structure, so that the difficulty in system design can be reduced.

After having applied the mirror that shakes, the light valve of 2K resolution ratio also can reach 4K resolution ratio with the mirror cooperation that shakes, and the light valve of 4K resolution ratio uses with the mirror cooperation that shakes can make this projection apparatus's resolution ratio reach 8K, compares in the size of light valve to have more the advantage because of the size of the mirror that shakes, consequently, sets up the mirror that shakes in projection apparatus and can also compromise the complete machine size when promoting formation of image resolution ratio.

In the embodiment of the present application, the galvanometer 127 is matched with the light valve 123 with 4K resolution in the illumination assembly 12, so that the projection device can realize the conversion from 4K resolution to 8K resolution. Meanwhile, the light beams emitted by the first light source 111 and the second light source 112 can provide a high-brightness and high-quality light source for the projection device after being combined, so that the imaging quality of the projection device is further improved. By the structure, the projection equipment can control the size of the whole machine within a certain range while realizing high-resolution imaging by the configuration of the double light sources and the single light valve and the vibration adding mirror, so that the appearance of the projection equipment is lighter, thinner and more attractive, and the practicability of the projection equipment is enhanced.

Optionally, the flatness of the galvanometer is less than 3 fringes and the irregularity is less than 1/2 fringes. Flatness refers to the deviation of the height of a macro relief of a substrate from an ideal plane. Comparing the measured actual surface with the ideal plane, wherein the line value distance between the measured actual surface and the ideal plane is a flatness error value; or by measuring the relative height difference of a plurality of points on the actual surface and then converting the flatness error value represented by a line value. The flatness error measurement method may refer to related technologies, and the embodiments of the present application are not limited herein. The mirror used in the present application has a flatness of less than 3 stripes and an irregularity of less than 1/2 stripes. The flatness of the galvanometer is not limited in this embodiment.

In the embodiment of the application, the first light source and the second light source are used for providing high-brightness illumination light beams; the first lens and the second lens are used for converging the illumination light beams, so that the quality of the light beams is further improved; the reflector is used for turning the direction of the light beam, so that the overall size of the projection equipment can be reduced; the third lens is used for balancing the optical path length of a field of view in the projection equipment; the compensating prism is used for receiving the light beam emitted by the third lens and guiding the light beam to the reversed total internal reflection prism which is glued with the compensating prism; the reverse total internal reflection prism is used for receiving the light beam guided out by the compensation prism, guiding the light beam to the light valve, receiving the light beam modulated by the light valve and guiding the light beam to the vibrating mirror; the light valve is used for receiving the light beam guided out by the reverse total internal reflection prism and modulating the light beam to form an image light beam; the lens assembly is used for receiving the image light beam, correcting and amplifying the image light beam and then projecting the image light beam to a screen.

To sum up, the embodiment of the present application provides a projection apparatus, this projection apparatus includes first light source, second light source, light pipe and a light valve that place along the light path, and first light source and second light source are placed along the first direction stack, and the long limit of the cross section of light pipe is parallel with the first direction, and the minor face is parallel with the minor face of the display surface of light valve. The corresponding placing positions of the first light source, the second light source, the light guide pipe and the light valve are set, and the combination of the double light sources and the single light valve is adopted, so that the projection equipment can achieve higher resolution and brightness by using fewer optical elements, and the volume of the projection equipment is reduced. The problem of the large size of projection equipment among the correlation technique is solved, the effect of reducing the size of projection equipment has been reached.

In addition, the embodiment of the application also provides a laser projection television, which comprises a screen and the projection equipment provided by the embodiment.

The image light beam emitted by the projection equipment can be projected on the screen to form an image picture on the screen, so that the effect of ultra-high definition display is achieved.

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 explicitly defined otherwise.

The present application is intended to cover various modifications, equivalent arrangements, improvements, etc. without departing from the spirit and scope of the present application.

Claims

1. A projection device is characterized by comprising a light source component, a light machine illumination system and a lens component which are sequentially arranged along a light path;

the light machine illumination system comprises a light pipe, an illumination mirror group and a light valve, wherein the light valve is provided with a rectangular display surface, the cross section of the light pipe is rectangular, the long side of the cross section is parallel to the first direction, and the short side of the cross section is parallel to the short side of the display surface of the light valve.

2. The projection device of claim 1, wherein a long side of the cross-section is perpendicular to a display surface of the light valve.

3. The projection apparatus according to claim 2, wherein the illumination mirror group includes a first lens, a second lens and a third lens, which are sequentially disposed along the optical path, a main optical axis of the first lens and the second lens is parallel to the axis of the light pipe, and an included angle exists between a main optical axis of the third lens and the display surface.

4. The projection device of claim 3, wherein an angle between a principal optical axis of the third lens and the display surface is equal to or less than 34 degrees.

5. The projection device of claim 4, wherein the optical-mechanical illumination system further comprises an inverted total internal reflection prism and a compensating prism, wherein the inverted total internal reflection prism is a right-angle prism, the right-angle prism comprises two first and second faces perpendicular to each other and an inclined face connected to the first and second faces, and the compensating prism is glued to the inclined face of the total internal reflection prism.

6. The projection device of claim 5, wherein the compensating prism comprises a wedge prism, and the third lens is cemented to the compensating prism.

7. The projection device of claim 4, wherein the optical bench illumination system further comprises an inverted total internal reflection prism, wherein the inverted total internal reflection prism is a right-angle prism, the right-angle prism comprises two first and second faces perpendicular to each other and an inclined face connected to the first and second faces, and the third lens is glued to the inclined face of the inverted total internal reflection prism.

8. The projection apparatus of claim 6, wherein the light source assembly further comprises a light combiner located on the light exit side of the first and second light sources and a diffuser assembly located on the light exit side of the light combiner, the diffuser assembly comprising a diffuser wheel or a diffuser sheet.

9. The projection device of any of claims 1-8, wherein the opto-mechanical illumination system further comprises a mirror, the mirror being positioned between the second lens and the third lens.

10. The projection device of any of claims 1-8, wherein the projection device further comprises a galvanometer positioned between the lens assembly and the inverted total internal reflection prism.