WO2016095619A1

WO2016095619A1 - Linear digital light procession micro projector

Info

Publication number: WO2016095619A1
Application number: PCT/CN2015/093779
Authority: WO
Inventors: 高志强; 赵远; 杨伟樑; 林清云
Original assignee: 广景科技有限公司
Priority date: 2014-12-17
Filing date: 2015-11-04
Publication date: 2016-06-23
Also published as: CN204270006U

Abstract

A linear digital light procession (DLP) micro projector, comprising: a light supply device, an illuminating optical system, a DLP light modulator (111), and a projection lens set (112). The light supply device comprises: a first LED light source (101) and a vertical collimating lens set (102) corresponding thereto, a second LED light source (103) and a horizontal collimating lens set (104) corresponding thereto, and a light splitting lens set (105, 106). The illuminating optical system comprises a beam shaping component and a beam guiding component. The beam shaping component comprises a fly-eye lens (107, 307) and a free-form surface optical component (108) or a relay lens. The beam guiding component comprises a first prism (109, 308) and a second rectangular prism (110, 309). The DLP micro projector has a small size, high projection performance and low production cost.

Description

Linear DLP pico projector

[Technical Field]

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

【Background technique】

Compared with LCD (Liquid Crystal Display) projectors, DLP (Digital Light Procession) projectors show great advantages in terms of stream brightness, video image display and contrast. The core device of the DLP projector is DMD (Digital Micromirror Device). DMD is a light modulating device developed by TI Corporation of the United States. It can project a picture composed of three primary colors (RGB) by controlling a micro-mirror array with extremely high reflectivity and an illumination optical system and a projection optical system.

Currently, a conventional DLP pico projector includes a light supply device, an optical path conversion device, an illumination optical system, a DLP light modulator, and a projection lens device. As shown in FIG. 1, the optical elements employed in the illumination optical system of the DLP pico projector include: a mirror 11 for changing the optical path to a desired direction, and for adjusting the direction of the light beam to a direction required for the operation of the DMD chip 14. The condenser lens 12 and the cemented prism 13 are concentrated.

The DLP pico projector illumination optical system includes a plurality of components such as a mirror 11, a condenser lens 12, and a cemented prism 13, and the optical paths of the plurality of components must be arranged in a "U"-shaped orientation, so that the existing DLP pico projector The lighting optical system is heavier and bulky, which cannot meet the requirements of the public for the light weight and small size of the DLP pico projector (especially the handheld DLP pico projector).

The information disclosed in this Background section is only intended to provide an understanding of the general background of the invention, and should not be construed as an admission

[Summary of the Invention]

In view of the above technical problems, an object of the present invention is to provide a simple and reasonable structure and a compact layout. A linear DLP pico projector that improves projection performance and greatly reduces production costs.

To achieve the above object, the present invention provides a linear DLP pico projector comprising: a light supply device comprising: a first LED light source and a corresponding vertical collimating lens group, a second LED light source and horizontal alignment corresponding thereto a lens group and a beam splitting lens group; the vertical collimating lens group includes: a first collimating lens and a second collimating lens, both disposed in front of the first LED light source; and the horizontal collimating lens group includes: a third standard a straight lens and a fourth collimating lens are disposed in front of the second LED light source; the beam splitting lens set includes: a first dichroic mirror and a second dichroic mirror; the illumination optical system includes: a beam shaping component and a beam guide The beam shaping component comprises: a fly-eye lens and a free-form optical component or a relay lens; the beam guiding component comprises: a first prism and a second right-angle prism; wherein the first surface of the first prism is incident The optical plane where the beam is totally reflected, the second surface is a free curved surface or plane coated with a reflective film, the third surface is an optical plane or a free curved surface; the DLP optical modulator, the DMD chip of the DLP optical modulator is flat A second right angle with the parallel sides of the rectangular prism; vertical projection angle side and the other lens group, an optical axis of the projection lens group and the second right angle prism.

Preferably, in the above technical solution, the free-form optical component and the fly-eye lens in the beam shaping component are separately disposed at adjacent positions, and the two sides of the fly-eye lens are a combination of a series of small lenses.

Preferably, in the above technical solution, the free-form optical component in the beam shaping component may be disposed on the second plane of the fly-eye lens, and the second plane of the fly-eye lens is disposed as a free-form surface; the first plane of the fly-eye lens is combined by a series of small lenses A single row of fly-eye lenses is formed, and the fly-eye lens includes a pair of single-row fly-eye lenses. The beam can be homogenized or integrated using a pair of single-row fly-eye lenses.

Preferably, in the above technical solution, when the third surface of the first prism is a free curved surface, the free-form optical component or the relay lens in the beam shaping component is the third surface of the first prism. The two sides of the fly-eye lens are a combination of a series of small lenses. The third face of the first prism can shape the beam in place of the freeform optical component or the relay lens in the beam shaping component.

Preferably, in the above technical solution, the first prism is made of glass or plastic.

Preferably, in the above technical solution, the transmitted light of the horizontal collimating lens group and the vertical collimating lens group The projected light intersects vertically.

Preferably, in the above technical solution, the second right-angle prism is disposed directly in front of the DMD chip of the DLP optical modulator.

Preferably, in the above technical solution, the second LED light source and the central optical axis of the horizontal collimating lens group corresponding thereto are coincident.

Preferably, in the above technical solution, the first LED light source is a two-color LED light source, and is composed of a red LED light source and a blue LED light source, and the second LED light source is composed of a green LED light source; the first dichroic mirror reflects the light of the blue LED light source. And transmitting light of the red LED light source and the green LED light source, the second dichroic mirror reflects the light of the red LED light source and transmits the light of the blue LED light source and the green LED light source, and the first dichroic mirror and the second dichroic mirror follow The angle is set such that the light emitted by the three-color LED light source is transmitted in parallel to the beam shaping member in the horizontal direction.

Preferably, in the above technical solution, the free curved surface of the free-form optical component is described by the following formula:

Where Z is the height of the surface, X and Y are the projection coordinates of the height of the surface on the optical axis, A1 to A9 are positional parameters, and C and k are curvature parameters.

Compared with the prior art, the invention has the following beneficial effects: the linear DLP pico projector has a simple and reasonable structure, and replaces the mirror in the prior art by combining the free-form optical component with the prism group in the illumination optical system. And the glue prism, to change the direction of the beam while compensating the DMD illumination source, simplifying the optical components and the components are arranged in a straight line, which makes the layout compact and reasonable, further reduces the size of the DLP pico projector, and improves the projection performance, and Significantly reduce production costs.

[Description of the Drawings]

1 is a schematic structural view of a conventional linear DLP pico projector.

2 is a schematic structural view of a first embodiment of a linear DLP micro projector of the present invention.

3 is a schematic structural view of a second embodiment of a linear DLP micro projector of the present invention.

4 is a schematic structural view of a third embodiment of the linear DLP micro projector of the present invention.

【detailed description】

The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings, but it is understood that the scope of the present invention is not limited by the specific embodiments.

The term "comprising" or variations such as "comprises" or "comprises", etc., are to be understood to include the recited elements or components, and Other components or other components are not excluded.

As shown in FIG. 2, a specific structure of a linear DLP pico projector according to an embodiment of the present invention includes sequentially disposed along an optical path: a light supply device, an illumination optical system, a DLP light modulator, and a projection lens group. Wherein, the illumination optical system comprises: a beam shaping component and a beam guiding component. The light-providing device includes: a first LED light source 101 and a vertical collimating lens group 102 corresponding thereto, a second LED light source 103, and a horizontal collimating lens group 104 and a spectroscopic lens group corresponding thereto; wherein, the first LED light source 101 is a two-color LED light source, which is composed of a red LED light source and a blue LED light source, and the second LED light source is composed of a green LED light source; the second LED light source 103 and the central optical axis of the corresponding horizontal collimating lens group 104 coincide. The vertical collimating lens group 102 is disposed in front of the first LED light source 101 for receiving light from the first LED light source 101 and nearly parallelizing the light; the horizontal collimating lens group 104 is disposed in front of the second LED light source 103, The light from the second LED light source 103 is received and the light is nearly parallelized; the transmitted light of the horizontal collimating lens group 104 intersects perpendicularly with the projected light of the vertical collimating lens group 102. The spectroscopic lens group includes: a first dichroic mirror 105 and a second dichroic mirror 106. The first dichroic mirror 105 reflects the light of the blue LED light source and transmits the light of the red LED light source and the green LED light source, and the second dichroic mirror 106 Reflecting the light of the red LED light source and transmitting the light of the blue LED light source and the green LED light source; the first dichroic mirror 105 and the second dichroic mirror 106 are arranged at a certain angle, so that the spectroscopic lens group realizes the blue LED light source and the red color The parallel light of the light emitted by the LED light source and the green LED light source is transmitted in a horizontal direction to the beam shaping member.

The illumination optical system comprises: a beam shaping component and a beam guiding component; wherein the beam shaping component comprises: a fly-eye lens 107 and a free-form optical component 108 (the free-form optical component 108 can also be replaced by a relay lens (not shown)) The beam is shaped. The two sides of the fly-eye lens 107 are a series of small lenses combined to homogenize the beam, and the fly-eye lens 107 coincides with the central optical axis of the free-form optical component 108. The beam guiding component includes: a first prism 109 and a second right-angle prism 110; wherein the first surface S1 of the first prism 109 is an optical plane that totally reflects the incident light beam, and the angle between the first surface S1 and the horizontal direction is 25 degrees to 45 degrees. The second surface S2 is a plane coated with a reflective film (which can also be designed as a free curved surface), the third surface S3 is an optical plane, and transmits a light beam from the beam shaping member; the second right angle prism 110 is disposed on the DMD chip of the DLP optical modulator. Directly forward of 111, the corner is parallel to the plane of the DMD chip 111, and the other right angle is perpendicular to the optical axis of the projection lens group. The freeform surface of the freeform optical component 108 can be described by:

The light beam from the fly-eye lens 107 is transmitted to the first prism 109 to achieve total reflection after being incident on the second right-angle prism 110, and then enters the DMD chip 111 of the DLP light modulator; when the lens of the DMD chip 111 is on, the DMD chip 111 is turned on. The modulated light beam is transmitted to the oblique side of the second right-angle prism 110 to generate total reflection, and is incident horizontally to the projection lens group 112.

The linear DLP micro projector uses a combination of free-form optical components and right-angle prisms to replace the mirrors and cemented prisms in the prior art to change the beam direction, while the light can achieve total reflection on the prism group, greatly compensating The DMD illumination source solves the problem of further reducing the size of the DLP pico projector and improving the projection performance. The layout is compact and reasonable, light and portable, and the production cost is reduced.

Embodiment 2:

Compared with the first embodiment, the linear DLP micro projector of the second embodiment is only partially adjusted by the illumination optical system, wherein the free-form optical component can be integrated with the fly-eye lens, and is disposed on the second plane of the fly-eye lens, and the fly-eye lens A plane is composed of a series of small lenses to form a single row of fly-eye lenses, and the fly-eye lens includes a pair of single-row fly-eye lenses. The beam can be homogenized or integrated using a pair of single-row fly-eye lenses. 3 is a schematic view showing the structure of a second embodiment of the present invention. The beam shaping member in the illumination system replaces the fly-eye lens 107 and the free-form optical member 108 of the first embodiment with a single row of fly-eye lens groups 207 and 208. The first surface P1 (P3) of the single-row fly-eye lens 207 (208) is a combination of a series of small lenses, which can homogenize the light beam, and the second surface P2 (P4) of the single-row fly-eye lens 207 (208) For free-form surfaces, the beam can be shaped. The freeform surface of the single row of fly-eye lenses 207 (208) can be described by:

Embodiment 3:

Compared with the first embodiment or the second embodiment, the linear DLP pico projector of the third embodiment is only partially adjusted in the illumination optical system. 4 is a schematic structural view of a third embodiment of the present invention. Unlike the first embodiment and the second embodiment, the illumination system is composed of a fly-eye lens 307, a first prism 308 and a second right-angle prism 309, and the first prism 308 The third surface S3 is a free curved surface, and the free-form optical member or relay lens in the beam shaping member is the third surface S3 of the first prism, and the third surface S3 of the first prism is used to shape the optical instead of the free-form optical member 108. . Both sides of the fly-eye lens 307 are a combination of a series of small lenses. The free curved surface of the third face S3 of the first prism 308 can be described by:

Where Z is the height of the surface, and X and Y are the projection coordinates of the height of the surface on the optical axis, respectively, A1 to A9 are Position parameters, C and k are curvature parameters.

In the above embodiment, the first prism material is glass, plastic or other light transmissive material.

The foregoing description of the specific exemplary embodiments of the present invention has The description is not intended to limit the invention to the precise forms disclosed. The embodiments were chosen and described in order to explain the particular embodiments of the invention Choose and change. The scope of the invention is intended to be defined by the claims and their equivalents.

Claims

A linear DLP pico projector, comprising:

The light supply device includes: a first LED light source and a corresponding vertical collimating lens group, a second LED light source, and a horizontal collimating lens group and a spectroscopic lens group corresponding thereto; the vertical collimating lens group includes: a collimating lens and a second collimating lens are disposed in front of the first LED light source; the horizontal collimating lens group includes: a third collimating lens and a fourth collimating lens, both disposed in front of the second LED light source The spectroscopic lens group includes: a first dichroic mirror and a second dichroic mirror;

The illumination optical system includes: a beam shaping component and a beam guiding component; wherein the beam shaping component comprises: a fly-eye lens and a free-form optical component or a relay lens; and the beam guiding component comprises: a first prism and a second right-angle prism; wherein The first surface of the first prism is an optical plane capable of totally reflecting the incident light beam, the second surface is a free curved surface or a plane coated with a reflective film, and the third surface is an optical plane or a free curved surface;

a DLP light modulator, the DMD chip plane of the DLP light modulator being parallel to a right angle side of the second right angle prism;

a projection lens group whose optical axis is perpendicular to the other right angle side of the second right angle prism.
The linear DLP pico-projector according to claim 1, wherein the free-form optical component and the fly-eye lens in the beam shaping member are separately disposed at adjacent positions, and the two sides of the fly-eye lens are a series of small lens combinations. Made.
The linear DLP pico projector according to claim 1, wherein the free-form optical component of the beam shaping member is disposed on a second plane of the fly-eye lens, and the second plane of the fly-eye lens is disposed as a free curved surface; The first plane of the fly-eye lens is assembled from a series of lenslets to form a single row of fly-eye lenses, the pair of fly-eye lenses comprising a pair of single-row fly-eye lenses.
The linear DLP pico-projector according to claim 1, wherein when the third surface of the first prism is a free curved surface, the free-form optical component in the beam shaping member or medium The lens is the third surface of the first prism, and the two sides of the fly-eye lens are a combination of a series of small lenses.
The linear DLP pico projector according to claim 1, wherein the first prism is made of glass or plastic.
The linear DLP pico-projector according to claim 1, wherein the transmitted light of the horizontal collimating lens group vertically intersects the projected light of the vertical collimating lens group.
The linear DLP pico-projector according to claim 1, wherein the second LED light source and a central optical axis of the horizontal collimator lens group corresponding thereto are coincident.
The linear DLP pico-projector according to claim 1, wherein the second right-angle prism is disposed directly in front of the DMD chip of the DLP optical modulator.
The linear DLP pico projector according to claim 1, wherein the first LED light source is a two-color LED light source, and is composed of a red LED light source and a blue LED light source, and the second LED light source is a green LED light source; The first dichroic mirror reflects light of the blue LED light source and transmits light of the red LED light source and the green LED light source, the second dichroic mirror reflects light of the red LED light source and transmits the blue LED light source and the green LED light source Light.
The linear DLP pico-projector according to claim 1, wherein the free-form surface of the free-form optical component is described by:

Where Z is the height of the surface, X and Y are the projection coordinates of the height of the surface on the optical axis, A1 to A9 are positional parameters, and C and k are curvature parameters.