WO2018171042A1

WO2018171042A1 - Projector

Info

Publication number: WO2018171042A1
Application number: PCT/CN2017/085729
Authority: WO
Inventors: 高志强; 杨伟樑; 赵远; 宁曼莹
Original assignee: 广景视睿科技（深圳）有限公司
Priority date: 2017-03-24
Filing date: 2017-05-24
Publication date: 2018-09-27
Also published as: CN106873295B; CN106873295A

Abstract

Disclosed is a projector, comprising: a light combining module (100) comprising a first prism unit and a second lens unit; a light supplying module comprising a first light source group (300) and a second light source group (200); and an image display module (400) and a lens (401). There is a gap between the first prism unit and the second lens unit of the light combining module (100), and the surfaces thereof which are close to each other are all planes. The image display module (400) and the second light source group (200) are arranged opposite each other and respectively located on two sides of the light combining module (100). The lens (401) and the first light source group (300) are arranged opposite each other and are located on the other two sides of the light combining module (100) respectively. The light combining module (100) is used for transmitting and reflecting the light from the first light source group (300) and the second light source group (200), such that the light from the first light source group (300) and the second light source group (200) is combined and then projected to the image display module (400) for modulation and display. The image displayed by the image display module (400) is reflected by the light combining module (100) and then emitted to the lens (401). By means of the integration of light paths by the light combining module (100), the projector has a simple structure and small size.

Description

Projector

Technical field

The present invention relates to the field of projection display technology, and in particular, to a projector.

Background technique

Most of the current miniature projection optomes use DLP technology from Texas Instruments, and their main image and light control devices are generally referred to as DMD light modulators. It is a micro-mirror array with extremely high reflectivity. It needs to be combined with the illumination optics and projection optics to convert the commonly used RGB three primary colors into a projection image that is easy for us to see. A commonly used method of combining an illumination optical system and a projection optical system is to use a total internal reflection element having a lens surface.

At present, projectors generally use a light source as a projection light source. Although the structure is simplified, it also produces a light source in a high-brightness environment, and the brightness cannot meet the user's needs, such as outdoor. The existing method of increasing the brightness is to use a phosphor or a fluorescent color wheel, which not only makes the structure more complicated, but also increases the volume of the projector, which also causes a great heat dissipation load on the projector and affects the service life.

Summary of the invention

The object of the present invention is to provide a projector with a simple structure according to the deficiencies of the prior art, which integrates multiple light sources by a light combining module, and sends the merged light sources together to an image display element to realize projection.

To achieve the above object, the present invention provides the following technical solutions:

A projector comprising: a light combining module comprising a first prism unit and a second lens unit; a light supply module comprising a first light source group and a second light source group; an image display module for generating a projection image; and a lens Receiving an image reflected by the image display module via the light combining module; a gap is formed between the first prism unit and the second lens unit of the light combining module, and faces close to each other are plane; the image display module and the image The second light source group is disposed opposite to each other, and is respectively located at two sides of the light combining module; the lens is disposed opposite to the first light source group, and is respectively located on the other two sides of the light combining module; the light combining module is used for Transmitting and reflecting light from the first light source group and the second light source group such that light from the first light source group and the second light source group passes through The light is projected to the image display module for modulation display; the image displayed by the image display module is reflected by the light combining module and then emitted to the lens.

Preferably, the light source emitted by the first light source group is incident on the plane of the second lens unit adjacent to the first prism unit at a 45 degree angle through the transmission of the second lens unit near the face of the first light source group.

Preferably, the first prism unit comprises a first prism, and the first prism is arranged as a right angle prism, and all three faces of the right angle prism are flat, wherein the angle between the two faces is 90 degrees.

Preferably, the first prism unit comprises a first prism and a third prism, wherein the first prism and the third prism are glued together; wherein the primary prism is arranged as a right angle prism, and three of the right angle prisms The faces are all flat, and the angle between the two faces is 90 degrees; the three-stage prism is set as a prism whose three faces are flat, and one of the faces of the third prism is glued to the face where the oblique edge of the first prism is located.

Preferably, the second lens unit comprises a secondary lens, and the secondary lens is disposed such that only one surface close to the first light source group is a plane, and the other surface is a curved prism.

Preferably, the second lens unit comprises a four-stage prism, a first free-form surface lens and a second free-form surface lens; wherein the four-stage prism, the first free-form surface lens and the second free-form surface lens are glued, wherein Each of the first freeform lens and the second freeform lens has a plane; the three faces of the quadrupole are planar, wherein the two planes are respectively planes of the first freeform lens and the second freeform lens Glue each other.

Preferably, the second lens unit comprises a four-stage prism and a second free-form lens, and a gap is formed between the second free-form lens and the fourth-stage prism, and the adjacent faces are plane.

Preferably, the first light source group includes a first light source, a collimating lens group, a beam splitter group, a relay lens, and a fly-eye lens or a light bar, wherein the first light source includes two color lights of three primary colors of RGB The second light source group includes a second light source, a collimating lens group, a relay lens, and a fly-eye lens or a light bar, wherein the second light source includes another three primary colors of the two primary colors of the RGB that are removed from the first light source group. Shade.

Preferably, the first light source group includes a first light source, a collimating lens group, a beam splitter group, a relay lens, and a fly-eye lens or a light bar, wherein the first light source includes three color lights of three primary colors of RGB; The second light source group includes a second light source, a collimating lens group, a relay lens, and a fly-eye lens or a light bar, wherein the second light source includes any one of RGB three primary color light sources, and the second light source is set to be strengthened Light source.

Preferably, the wavelength of the enhanced light source is narrower than the wavelength of the RGB three primary color source of the first source group.

The invention has the beneficial effects that the light path integration function of the light combining module combines the multiple light sources to reach the image display element for modulation display, and has a simple structure and a small volume. At the same time, one of the light sources can be set to enhance the light, and the wavelength of the enhanced light is narrower than that of the other light sources to enhance the brightness, thereby improving the brightness of the entire system.

DRAWINGS

1 is a schematic structural view of a projector according to Embodiment 1 of the present invention;

2 is a schematic structural diagram of a photosynthetic module according to an embodiment of the present invention;

3 is a schematic structural diagram of another scheme of a photosynthetic module according to an embodiment of the present invention;

4 is a schematic structural view of a projector according to Embodiment 2 of the present invention.

detailed description

The technical solution of the present invention will be described below with reference to the accompanying drawings and embodiments.

Embodiment 1

FIG. 1 is a schematic structural view of a projector according to the present invention, comprising: a first light source group 300 that generates three primary colors of RGB; and a light supply module, a first prism unit that generates a red laser light source, that is, a second light source group 200 that enhances the light source 201; The first light combining module 100 in which the second lens unit is combined, the image display module 400 that generates the projected image, and the lens 401 that receives the image reflected by the first light combining module 100.

The image display module 400 is disposed opposite to the second light source group 200, and is respectively disposed on opposite sides of the first light combining module 100. The lens 401 is disposed opposite to the first light source group 300, and is respectively located on the other sides of the first light combining module 100. The RGB three primary color lights generated by the first light source group 300 are totally totally reflected by the first light combining module 100 to the image display module 400, and the red laser light generated by the enhanced light source 201 of the second light source group 200 is directly transmitted through the first light combining module 100. The image display module 400, after being modulated by the image display module 400, reflects the displayed image again through the first light combining module 100 to reach the lens 401.

The first light combining module 100 shown in FIG. 1 includes a first prism unit and a second lens unit; wherein the first prism unit includes a first prism 101, and the second lens unit includes a secondary lens 102.

In the embodiment of the present invention, the primary prism 101 is disposed as a right-angle prism, and all three faces of the right-angle prism are planar, and the secondary lens 102 is disposed such that only one surface close to the first light source group is a plane, and the rest a prism having a curved surface, wherein the secondary lens 102 The plane is close to the plane with the oblique side of the primary prism 101, and in order to obtain a better refractive index, a certain plane is provided between the plane of the secondary lens 102 and the plane of the oblique side of the primary prism 101. gap.

In the embodiment of the present invention, the first prism unit and the second lens unit have a gap therebetween, and the surfaces close to each other are planes, and the mutually close planes may be arranged in parallel or non-parallel.

In the embodiment of the present invention, the light source emitted by the first light source group 300 is transmitted through the surface of the secondary lens 102 of the second lens unit close to the surface of the first light source group 300, and is incident on the plane of the secondary lens 102 of the second lens unit. In order to obtain the effect of total reflection, it is preferable that the light source of the first light source group 300 is incident on the plane of the secondary lens 102 of the second lens unit at an angle of 45 degrees.

In the embodiment of the present invention, the light source emitted by the first light source group 300 is incident on the surface of the second lens unit close to the first light source group 300, and is incident on the second lens unit close to the first prism unit at an angle of 45 degrees. on flat surface. Wherein, the angle between the two faces of the right angle prism may be set to 90 degrees, and the angle between the face where the oblique edge is located and the optical axis of the RGB three primary colors generated by the first light source group 300 may be set to 45 degrees. . In the embodiment of the present invention, the surface of the second lens unit adjacent to the first light source group 300 is plated with a film that transmits light of a narrow wavelength and reflects light of a wavelength.

In the embodiment of the invention, the planes close to each other of the first prism unit and the second lens unit are plated with an anti-reflection film.

In the embodiment of the present invention, the first light source group 300 includes: a first light source, a first collimating lens group 311, a second collimating lens group 312, and a third collimating lens group 313, and the anti-green light blue light a first beam splitter 304, a second beam splitter 306 that reflects red and blue light, a first relay lens 305, a second relay lens 308, and a first fly-eye lens or light rod 307; wherein the first light source includes The RGB three primary color light sources, that is, the red light source 301, the green light source 302, and the blue light source 303, and the RGB three primary color light sources may adopt LED light sources.

The incident direction of the blue light source 303 is consistent with the central optical axis of the third collimating lens 313, the first relay lens 305, the first fly-eye lens or the light bar 307 and the second relay lens 308, and is coupled to the first splitting light. The angle between the mirror 304 and the second beam splitter 306 is 45 degrees.

The blue light source 303 sequentially transmits the third collimating lens 313, the first dichroic mirror 304, the first relay lens 305, the second dichroic mirror 306, the first fly-eye lens or the light rod 307, and the second relay lens 308. Finally, the second lens unit of the light combining module 100 is reached at an angle.

The incident direction of the green light source 302 is perpendicular to the central axis of the third collimating lens 313, the first relay lens 305, the first fly-eye lens or the light bar 307 and the second relay lens 308, and the first beam splitter The angle between 304 and second beam splitter 306 is 45 degrees.

The green light source 302 is sequentially transmitted through the second collimating lens group 312, and after being reflected by the first beam splitting mirror 304, transmits the first relay lens 305, the second beam splitting mirror 306, the first fly-eye lens or the light rod 307, and the second. The relay lens 308 finally reaches the second lens unit of the light combining module 100 at an angle.

The incident direction of the red light source 301 is perpendicular to the central axis of the third collimating lens 313, the first relay lens 305, the first fly-eye lens or the light bar 307 and the second relay lens 308, and is coupled to the first beam splitter. The angle between 304 and second beam splitter 306 is 45 degrees.

The red light source 301 is sequentially transmitted through the first collimating lens group 311, and after being reflected by the second beam splitting mirror 306, the first compound eye lens or the light bar 307 and the second relay lens 308 are finally transmitted to the light combining module 100 at an angle. Second lens unit.

The RGB three primary color light sources emitted from the first light source group 300, that is, the red light source 301, the green light source 302, and the blue light source 303 are respectively transmitted and reflected and then incident on the secondary lens 102 of the second lens unit, and are passed through the secondary lens 102. After the curved surface of the first light source group 300 is transmitted, it is incident on the plane of the secondary lens 102, and is reflected and incident on the other curved surface of the secondary lens 102, and after being reflected, reaches the image display module 400. The surface here can also be replaced by a plane, and the plane can also be replaced by a surface, as long as the transmission and reflection of the light source can be achieved.

In the embodiment of the present invention, the second light source group 200 includes: a second light source, a fourth collimating lens group 202, a second fly-eye lens or a light bar 203, and a third relay lens 204. The second light source is configured to enhance the light source 201. In the embodiment, the enhanced light source 201 is a red laser light source, the incident direction of the red laser light source is opposite to the fourth collimating lens group 202, and the second fly-eye lens or light. The central optical axis of the rod 203 and the third relay lens 204 are identical; the red laser light sequentially transmits the fourth collimating lens group 202, the second fly-eye lens or the light rod 203 and the third relay lens 204, and finally reaches at an angle The second lens unit of the light combining module 100.

The second light source group 200, that is, the red laser light generated by the enhanced light source 201 passes through the fourth collimating lens group 202, and the second fly-eye lens or the light bar 203 and the third relay lens 204 are transmitted and then incident on the second lens unit. After the secondary lens 102 is transmitted near the curved surface of the first light source group 300, the primary lens 102 is merged with the light source reflected by the plane of the secondary lens 102 from the three primary color light sources emitted from the first light source group 300, and the direction after the convergence is the same. The merged light source is incident on the other curved surface of the secondary lens 102, and after being reflected, reaches the image display module 400. The image display module 400 is modulated to reflect the displayed image to the lens 401 again through the first light combining module 100. In the embodiment of the present invention, the image display module 400 is mainly a light modulating device, such as a DMD chip.

In the embodiment of the present invention, the angle of the first light source group 300 and the second light source group 200 after being merged and incident on the image display chip depends on the chip type of the image display module, for example, the image display module is 90 degree reflection, then The angle at which the second light source group 300 and the first light source group 200 are incident on the image display module is normal incidence. If the image display module is reflecting at other angles, then The incident angles of the two light source groups 300 and the first light source group 200 after the convergence are correspondingly changed, which can be adjusted by adjusting the angle of the incident light of the first light source group 200 and the reflection of the first prism unit and the second prism unit. And the transmission angle is achieved.

In the embodiment of the present invention, the second light source, that is, the enhanced light source 201 is not necessarily provided as a red laser light source, and the enhanced light source 201 may be another color light source whose optical wavelength is narrower than that of the first light source module. Thereby achieving the effect of improving the projection brightness.

As shown in FIG. 2, in the embodiment, the first light combining module may be replaced by the second light combining module 103, wherein the first prism unit is a cemented lens, that is, the first prism 101 and the third prism 104 are glued together; The second lens unit is a non-glued lens, that is, includes a secondary lens 102. The first prism 101 is disposed as a right-angle prism, and the three faces of the right-angle prism are flat, wherein the angle between the two faces is 90 degrees, and the face where the oblique edge is located and the RGB three primary colors generated by the first light source group 300 The angle of the optical axis is 45 degrees; the third-stage prism 104 is a prism whose three faces are flat, and one of the faces is glued to the face where the oblique side of the first prism 101 is located. The secondary lens 102 is disposed such that only one surface is a flat surface, and the other surface is a curved prism, wherein the plane of the secondary lens 102 and one surface of the tertiary prism 104 are close to each other and parallel to each other.

As shown in FIG. 3, in the embodiment, the first light combining module can also be replaced by the third light combining module 106, wherein the first prism unit is a non-glued lens, that is, includes a first prism 101, and the first prism 101 The angle prism is disposed, and the three faces of the right-angle prism are flat, wherein the angle between the two faces is 90 degrees, and the angle between the face where the oblique edge is located and the optical axis of the RGB three primary colors generated by the first light source group 300 is 45 degrees; the second lens unit is a cemented lens, that is, including a four-stage prism 105, a first free-form surface lens 107, and a second free-form surface lens 108, wherein the first free-form surface lens 107 and the second free-form surface lens 108 each have One face is a plane, and the other faces are curved surfaces; the three faces of the four-stage prism 105 are all flat, one of the planes is close to the plane where the oblique sides of the first prism 101 are located, and are parallel to each other, the four stages The other two planes of the prism 105 are glued to the planes of the first freeform lens 107 and the second freeform lens 108, respectively.

In the embodiment of the present invention, the second lens unit may further include a fourth-stage prism and a second free-form surface lens, and a gap is formed between the second free-form surface lens and the fourth-stage prism, and the adjacent surfaces are plane.

The light combining module of the embodiment of the present invention is not limited to the above embodiment, and any structure that can implement the functions of the embodiment of the present invention can be applied to the light combining module of the projector shown in FIG. 1.

Embodiment 2

The projector structure shown in FIG. 4 is mainly different from the first embodiment in the first light source group 310 and the second light supply module. The light source group 206 is different from the first embodiment, and the rest of the structure is the same as that of the first embodiment.

The main difference between the first light source group 310 and the first light source group 300 in the first embodiment is that the first light source group 310 in the embodiment uses two color lights of the three primary colors as the first light source, and the color light selected in this embodiment is selected. For the blue light and the green light, the three light colors of the three primary colors are used as the light source as compared with the first light source group 300 in the first embodiment. In this embodiment, the first relay lens 305 and the second beam splitter 306 are omitted, and other structures and The arrangement is unchanged.

The main difference between the second light source group 206 and the second light source group 200 in the first embodiment is that the second light source includes another three primary color lights of the two primary colors of the RGB that are removed from the first light source group. In the example, the red laser source of the second light source group 200 in the first embodiment is replaced by red light, and the light can be an LED light source, compared with other structures of the second light source group 200 in the first embodiment. Not constant.

The surface of the second lens unit adjacent to the second light source group 206 is plated with a film of anti-blue light and green light red light.

The above is a further detailed description of the present invention in connection with the preferred technical solutions, and the specific embodiments of the invention are not limited to the description. A person skilled in the art can make a simple derivation and replacement without departing from the inventive concept, and should be regarded as the protection scope of the present invention.

Claims

A projector, comprising:

a light combining module comprising a first prism unit and a second lens unit;

a light supply module, comprising a first light source group and a second light source group;

An image display module for generating a projected image;

a lens for receiving an image reflected by the image display module via the light combining module;

a gap is formed between the first prism unit and the second lens unit of the light combining module, and faces close to each other are planes;

The image display module is disposed opposite to the second light source group, and is respectively located at two sides of the light combining module;

The lens is disposed opposite to the first light source group and is respectively located on the other two sides of the light combining module;

The light combining module is configured to transmit and reflect light from the first light source group and the second light source group, so that light from the first light source group and the second light source group passes through a light combination Projecting to the image display module for modulation display;

The image displayed by the image display module is reflected by the light combining module and then emitted to the lens.
The projector according to claim 1, wherein the light source emitted from the first light source group is incident on the second lens unit at an angle of 45 degrees via transmission of the second lens unit near the surface of the first light source group. On a plane close to the first prism unit.
A projector according to claim 1 or 2, wherein said first prism unit comprises a first prism, said first prism is provided as a right angle prism, and all three faces of said right angle prism are flat The angle between the two faces is 90 degrees.
A projector according to claim 1 or 2, wherein the first prism unit comprises a primary prism and a tertiary prism, and the primary prism and the tertiary prism are glued together; wherein The first prism is arranged as a right-angle prism, the three faces of the right-angle prism are flat, and the angle between the two faces is 90 degrees; the three-stage prism is set as a prism with three faces being flat, and the three-stage prism One of the faces is glued to the face on which the bevel of the first prism is located.
A projector according to claim 1 or 2, wherein said second lens unit comprises a secondary lens, said secondary lens being disposed such that only one face adjacent to said first light source group is planar, and the remaining faces A prism that is a curved surface.
A projector according to claim 1 or 2, wherein said second lens unit comprises a four-stage prism, a first free-form surface lens and a second free-form surface lens; wherein said four-stage prism, The first freeform lens and the second freeform lens are glued, wherein each of the first freeform lens and the second freeform lens has a plane; the third of the four prisms The faces are all planes, wherein the two planes are glued to the planes of the first freeform lens and the second freeform lens, respectively.
A projector according to claim 1 or 2, wherein said second lens unit comprises a four-stage prism and a second free-form lens, and a gap between the second free-form lens and the four-stage prism The adjacent faces are planes.
The projector according to claim 1 or 2, wherein the first light source group comprises a first light source, a collimating lens group, a beam splitter group, a relay lens, and a fly-eye lens or a light rod. The first light source includes two color lights of three primary colors of RGB; the second light source group includes a second light source, a collimating lens group, a relay lens, and a fly-eye lens or a light bar, wherein the second light source includes three primary colors of RGB Another three primary color lights of the two color lights of the first light source group are removed.
The projector according to claim 1 or 2, wherein the first light source group comprises a first light source, a collimating lens group, a beam splitter group, a relay lens, and a fly-eye lens or a light rod. The first light source includes three color light sources of RGB three primary colors; the second light source group includes a second light source, a collimating lens group, a relay lens, and a fly-eye lens or a light bar, wherein the second light source includes RGB three primary color light sources. Any one of the colored lights, the second light source being arranged to enhance the light source.
A projector according to claim 9, wherein said enhanced light source has a wavelength that is narrower than a wavelength of said RGB three primary color source of said first source group.