TWI384160B - Illumination system and projection apparatus using the same - Google Patents

Description

Lighting system and projection device using the same

The present invention relates to a display device, and more particularly to a projection device and illumination system therefor.

1 is a schematic diagram of a conventional illumination system of a projection device. Referring to FIG. 1, U.S. Patent No. 7,300,177 discloses an illumination system 100 for a projection device, which includes three light source modules 172, 172', 172", an optical component group 115, and a plurality of dichroic mirrors. 120R, 120G, 120B and a concentrating mirror 118. The light source module 172 has three light-emitting elements 194R, 194G, 194B, and the light source module 172' has three light-emitting elements 194'R, 194'G, 194'B, and the light source module The group 172" has three light-emitting elements 194"R, 194"G, 194"B. The optical element group 115 includes a plurality of lenses disposed on the transmission path of the light beam. The dichroic mirrors 120R, 120G, 120B extend in substantially the same direction. And are not parallel to each other, and the dichroic mirrors 120R, 120G, 120B are used to reflect the red, green, and blue beams to the condensing mirror 118, respectively, and the condensing mirror 118 is used to converge the beams to the light valve 117.

This lighting system 100 uses three light source modules 172, 172', 172", resulting in a larger overall size and higher production costs.

2 is a schematic view of another conventional projection device. Referring to FIG. 2, U.S. Patent No. 6,910,777 and U.S. Patent No. 1,236,568 disclose a projection apparatus comprising an illumination system 10 and a color separation optical system 20. The color separation optical system 20 includes a plurality of dichroic mirrors 21, 22G1, 23R and two mirrors 22B, 23G2. The dichroic mirror 21 is for separating the white light beam W supplied from the light source 10, passing the blue light beam B and the first green light beam G1 and reflecting the red light beam R and the second green light beam G2.

The dichroic mirror 22G1 described above is for reflecting the first green light G1 to the liquid crystal panel 31 and passing the blue light beam B, and the blue light beam B is reflected by the mirror 22B to the liquid crystal panel 31. Further, the dichroic mirror 23R is for reflecting the red light beam R to the liquid crystal panel 32 and passing the second green light beam G2, and the mirror 23G2 is for reflecting the second green light beam G2 to the liquid crystal panel 32.

The liquid crystal panel 31 is configured to convert the blue light beam B and the first green light beam G1 into a first image light beam, and the liquid crystal panel 32 is configured to convert the red light beam R and the second green light beam G2 into a second image light beam. In addition, the light combining component 50 is configured to combine the first image beam and the second image beam, and project the combined first image beam and the second image beam onto the screen (not shown) by the projection lens 60.

The light source 10 of the projection device adopts a conventional light source, that is, a structure in which a bulb and a reflector are provided, so that it has a disadvantage of a large size.

3 is a schematic view of another conventional projection device. Referring to FIG. 3, U.S. Patent No. 6,987,546 discloses a projection apparatus, the illumination system comprising a light source 1, two lens arrays 2, 3, a polarizer 4, three dichroic mirrors 5a, 5b, 5c, two a concentrating element 6a, 6b, a rotary polyhedral reflector 7 and a polarizing beam splitter (PBS) 8, wherein the dichroic mirrors 5a, 5b, 5c extend substantially the same direction and are not mutually parallel.

The light beam provided by the light source 1 described above sequentially passes through the lens arrays 2, 3 and is converted into a polarized light beam by the polarizer 4. Next, the dichroic mirrors 5a, 5b, 5c are used to separate the polarized light beam into three polarized light beams of different colors. The concentrating elements 6a, 6b are used to converge these polarized beams to the rotating polyhedral reflector 7, and the rotating polyhedral reflector 7 is used to reflect these polarized beams to the polarizing beam splitter 8. The polarizing beam splitter 8 is used to reflect these polarized light beams to the liquid crystal panel 9, and the liquid crystal panel 9 converts these polarized light beams into image light beams and changes the polarization direction of the image light beams. The image beam is reflected by the liquid crystal panel 9 and passed through the polarization beam splitter 8, and then projected onto the screen (not shown) by the projection lens 11.

The light source 1 of the projection device adopts a conventional light source, that is, a structure in which a bulb is added to a reflector, so that it has a disadvantage of a large size.

The present invention provides an illumination system that has the advantage of a small size.

The present invention further provides a projection apparatus having the advantage of a small size.

Other objects and advantages of the present invention will become apparent from the technical features disclosed herein.

In order to achieve one or a part or all of the above or other purposes, an embodiment of the present invention provides an illumination system including a first light source unit, a second light source unit, and a light combining unit. The first light source unit is adapted to provide a first color light beam and a second color light beam, and the second light source unit is opposite to the first light source unit and is adapted to provide a third color light beam. The light combining unit is disposed between the first light source unit and the second light source unit, and the light combining unit has a first color separation layer, a second color separation layer and a third color separation layer, wherein the first color separation layer and The second dichroic layer has substantially the same extending direction and is not parallel to each other, and the third dichroic layer intersects the first dichroic layer and the second dichroic layer, respectively. The first dichroic layer is adapted to reflect the first color beam and is adapted to pass the second color beam and the third color beam, the second dichroic layer being adapted to reflect the second color beam and adapted to pass the third color beam, and The third dichroic layer is adapted to reflect the third color beam and is adapted to pass the second color beam with the first color beam. The first color beam, the second color beam, and the third color beam reflected by the light combining unit form an illumination beam.

In an embodiment of the invention, the light combining unit comprises a dovetail and a dichroic mirror. The dovetail has a first surface opposite to the first light source unit and a second surface opposite to the first surface, wherein the first dichroic layer is disposed on the first surface, and the second dichroic layer is disposed on the second surface . Further, the dichroic mirror intersects the dovetail, and the dichroic mirror includes a third dichroic layer.

In an embodiment of the invention, the light combining unit comprises a first dichroic mirror, a second dichroic mirror and a third dichroic mirror. The first dichroic mirror includes a first dichroic layer, the second dichroic mirror includes a second dichroic layer, and the third dichroic mirror includes a third dichroic layer.

In an embodiment of the invention, the first light source unit includes a first point light source and a second point light source, and the second light source unit includes a third point light source.

In an embodiment of the invention, the first point source, the second point source and the third point source are light emitting diodes.

In an embodiment of the invention, one of the first point source and the second point source is a blue light source, and the first point source and the second point source are the other one, and the third point source is Green light source.

In an embodiment of the invention, the first dichroic layer and the second dichroic layer are rotated by a first predetermined angle and a second predetermined angle by a reference plane in opposite directions. The angle between a normal vector of the reference plane and the optical axes of the first color beam and the second color beam is 45 degrees, and the first predetermined angle and the second predetermined angle are less than 45 degrees and greater than 0 degrees. In an embodiment, the first predetermined angle and the second predetermined angle are, for example, between 10 and 15 degrees, respectively.

In an embodiment of the invention, the second light source unit is further adapted to provide a fourth color light beam, and the light combining unit further has a fourth color separation layer. The third dichroic layer and the fourth dichroic layer extend substantially in the same direction and are not parallel to each other. The fourth dichroic layer is adapted to reflect the fourth color beam and is adapted to pass the first color beam, the second color beam and the third color beam, and the first dichroic layer, the second dichroic layer and the third dichroic layer Suitable for passing the fourth color beam. The first color beam, the second color beam, the third color beam, and the fourth color beam reflected by the light combining unit form an illumination beam.

In an embodiment of the invention, the light combining unit comprises a first dovetail and a second dovetail. The first dovetail has a first surface opposite the first light source unit and a second surface opposite the first surface. The first dichroic layer is disposed on the first surface, and the second dichroic layer is disposed on the second surface. The second dovetail intersects the first dovetail, and the second dovetail has a third surface opposite the second source unit and a fourth surface opposite the third surface. The third dichroic layer is disposed on the third surface, and the fourth dichroic layer is disposed on the fourth surface.

In an embodiment of the invention, the light combining unit comprises a first dichroic mirror, a second dichroic mirror, a third dichroic mirror and a fourth dichroic mirror. The first dichroic mirror includes a first dichroic layer, the second dichroic mirror includes a second dichroic layer, the third dichroic mirror includes a third dichroic layer, and the fourth dichroic mirror includes a fourth dichroic layer.

In an embodiment of the invention, the first dichroic layer and the second dichroic layer are rotated by a first predetermined angle and a second predetermined angle by a first reference plane in opposite directions. The angle between a first normal vector of the first reference plane and the optical axes of the first color beam and the second color beam is 45 degrees. In addition, the angles of the third dichroic layer and the fourth dichroic layer are respectively rotated by a second reference plane in a reverse direction by a third predetermined angle and a fourth predetermined angle. The angle between a second normal vector of the second reference plane and the optical axes of the third color beam and the fourth color beam is 45 degrees. The first predetermined angle, the second predetermined angle, the third predetermined angle, and the fourth predetermined angle are less than 45 degrees and greater than 0 degrees. In an embodiment, the first predetermined angle, the second predetermined angle, the third predetermined angle, and the fourth predetermined angle are, for example, between 10 degrees and 15 degrees, respectively.

In an embodiment of the invention, the illumination system further includes a first collimator and a second collimating component. The first collimating element is disposed between the first light source unit and the light combining unit, and the second collimating element is disposed between the second light source unit and the light combining unit.

In an embodiment of the invention, the illumination system further includes a lens array or a light integration rod disposed on the transmission path of the illumination beam.

In an embodiment of the invention, the illumination system further includes a concentrating element disposed on the transmission path of the illumination beam.

The invention further provides a projection device comprising the above illumination system, a light valve and a projection lens. The light valve is disposed on the transmission path of the illumination beam, and is adapted to convert the illumination beam into an image beam, and the projection lens is disposed on the transmission path of the image beam.

In an embodiment of the invention, the projection apparatus further includes a field lens disposed between the light valve and the projection lens.

In an embodiment of the invention, the projection apparatus further includes a mirror disposed on the transmission path of the illumination beam to reflect the illumination beam to the light valve.

In an embodiment of the invention, the projection apparatus further includes an internal total reflection prism (TIR prism) disposed between the light valve and the projection lens.

The embodiment of the present invention has at least one of the following advantages. In the illumination system of the embodiment of the present invention, since the first light source unit and the second light source unit are disposed on opposite sides of the light combining unit, the illumination system can be effectively reduced. size. Further, the projection apparatus of the embodiment of the present invention has an advantage of a small size because of the use of such a small-sized illumination system.

The above and other objects, features and advantages of the present invention will become more <RTIgt;

The above and other technical contents, features and advantages of the present invention will be apparent from the following detailed description of the preferred embodiments. The directional terms mentioned in the following embodiments, such as up, down, left, right, front or back, etc., are only directions referring to the additional drawings. Therefore, the directional terminology used is for the purpose of illustration and not limitation.

4 is a schematic diagram of a projection apparatus according to an embodiment of the present invention. Referring to FIG. 4 , the projection apparatus 200 of the embodiment includes a light valve 210 , a projection lens 220 , and an illumination system 300 . The illumination system 300 is adapted to provide an illumination beam 302, and the light valve 210 is disposed on the transmission path of the illumination beam 302 and is adapted to convert the illumination beam 302 into an image beam 303. The light valve 210 is, for example, a digital micro-mirror device (DMD), a liquid crystal on silicon panel (LCOS panel), or other suitable light valve. In addition, the projection lens 300 is disposed on the transmission path of the image beam 303 for projecting the image beam 303 onto a screen (not shown).

In the embodiment, the illumination system 300 includes a first light source unit 310, a second light source unit 320, and a light combining unit 330. The first light source unit 310 is adapted to provide a first color light beam 313r and a second color light beam 313b. The second light source unit 320 is opposite to the first light source unit 310 and is adapted to provide a third color light beam 323g. The light combining unit 330 is disposed between the first light source unit 310 and the second light source unit 320, and the light combining unit 330 has a first color separation layer 333, a second color separation layer 335 and a third color separation layer 337. The first dichroic layer 333 and the second dichroic layer 335 extend substantially in the same direction and are not parallel to each other, and the third dichroic layer 337 intersects with the first dichroic layer 333 and the second dichroic layer 335, respectively, to form a similar X-shaped shape. The X-shape is composed of two arms that intersect each other, and the first dichroic layer 333 and the second dichroic layer 335 extend substantially in the same direction, meaning that the first dichroic layer 333 and the second dichroic layer 335 are X. One of the arms of the shape, and the third dichroic layer 337 serves as the other arm of the X shape.

In the above, the first dichroic layer 333 is adapted to reflect the first color beam 313r and pass the second color beam 313b and the third color beam 323g, and the second dichroic layer 335 is adapted to reflect the second color beam 313b and make the third The color beam 323g passes, and the third dichroic layer 337 is adapted to reflect the third color beam 323g and pass the second color beam 313b and the first color beam 313r. The first color light beam 313r, the second color light beam 313b, and the third color light beam 323g reflected by the light combining unit 330 form the illumination light beam 302 described above.

In the above illumination system 300, the first light source unit 310 includes, for example, a first point light source 312r and a second point light source 312b, and the second light source unit 320 includes, for example, a third point light source 322g. The first point light source 312r, the second point source 312b, and the third point source 322g may be light emitting diodes or other suitable point sources. Further, in the present embodiment, the first point light source 312r is, for example, a red light source, the second point source 312b is, for example, a blue light source, and the third point source 322g is, for example, a green light source. In another embodiment, the first point source 312r can be a blue source and the second point source 312b can be a red source. However, the above colors are for illustrative purposes only, and the present invention does not limit the colors of the first point source 312r, the second point source 312b, and the third point source 322g.

In this embodiment, the light combining unit 330 includes a dovetail 332a and a dichroic mirror 334a. The dovetail 332a has a first surface 336a opposite to the first light source unit 310 and a second surface 336b opposite to the first surface 336a, wherein the first dichroic layer 333 is disposed on the first surface 336a, and the second sub-division The color layer 335 is disposed on the second surface 336b. Further, the dichroic mirror 334a intersects the dovetail 332a, and the dichroic mirror 334a includes a third dichroic layer 337.

The lighting system 300 described above may further include a first collimating element 340 and a second collimating element 350. The first collimating element 340 is disposed between the first light source unit 310 and the light combining unit 330 for collimating the first color light beam 313r and the second color light beam 313b. The second collimating element 350 is disposed on the second light source unit 320 The light combining unit 330 is configured to collimate the third color light beam 323g. In addition, illumination system 300 can further include a lens array 360 disposed on the transmission path of illumination beam 302 for homogenizing illumination beam 302. This lens array 360 is, for example, a fly-eye lens. In another embodiment, the lens array 360 can also be replaced with a light integrator or other light homogenizing element. In addition, the illumination system 300 can further include a concentrating element 370 disposed on the transmission path of the illumination beam 302 to converge the illumination beam 302 to the light valve 210.

The projection device 200 of the present embodiment further includes a mirror 230 disposed on the transmission path of the illumination beam 302 to reflect the illumination beam 302 to the light valve 210. In addition, the projection device 200 may further include a field mirror 240 disposed between the light valve 210 and the projection lens 220.

In this embodiment, since the light combining unit 330 is used for combining light, and the first light source unit 310 and the second light source unit 320 are disposed on opposite sides of the light combining unit 330, space utilization can be improved to reduce The size of the illumination system 300. In this way, the space utilization inside the projection device 200 can be improved, so that the projection device 200 has the advantage of a small size. In addition, the light source including the bulb and the lamp cover is used in the prior art, and the light source of the first light source unit 310 and the second light source unit 320 of the embodiment can be selected from a small-sized point light source, so that the illumination system 300 and the projection device can be further reduced. 200 size.

In addition, if the first color separation layer 333 is parallel to the second color separation layer 335, when the first color light beam 313r and the second color light beam 313b are projected on the lens array 360, there is a light spot misalignment and a projection angle deflection. The problem that the spot misalignment means that the first color light beam 313r and the second color light beam 313b are projected on the lens array 360 cause the two spots to partially overlap. In order to improve the above problem, the illumination system 300 of the present embodiment designs the angles of the first dichroic layer 333 and the second dichroic layer 335 to be non-parallel to improve the image quality of the projection device 200. Specifically The angle of the first dichroic layer 333 and the second dichroic layer 335 is rotated by a reference plane (or first reference plane) P1 in the opposite direction by a first predetermined angle θ 1 and a second predetermined angle. θ 2. The angle between a normal vector (or first normal vector) N1 of the reference plane P1 and the optical axes of the first color beam 313r and the second color beam 313b is 45 degrees, and the first predetermined angle θ 1 and The second predetermined angle θ 2 is less than 45 degrees and greater than 0 degrees. In an embodiment, the first predetermined angle θ 1 and the second predetermined angle θ 2 are, for example, between 10 degrees and 15 degrees, respectively. It should be noted that the above range of angles is for example only, and the first predetermined angle θ 1 and the second predetermined angle θ 2 may be different depending on the design.

It should be noted that, although the above-mentioned projection device 200 adopts the architecture of the mirror 230 and the field lens 240, the illumination system 300 of the present embodiment can also be applied to projection devices of other architectures, such as the projection device 200' shown in FIG. . The projection device 200' uses an internal total reflection 稜鏡250 disposed between the light valve 210 and the projection lens 220 to reflect the illumination beam 302 to the light valve 210. Further, although the light valve 210 of the projection apparatus 200, 200' is exemplified by a reflective light valve, the illumination system 300 can also be applied to a projection apparatus using a transmissive light valve.

Figure 6 is a schematic illustration of an illumination system in accordance with another embodiment of the present invention. Referring to FIG. 6, the illumination system 300a of the present embodiment is similar to the illumination system 300 described above, with the difference being the light combining unit. In more detail, the light combining unit 330a of the illumination system 300a of the present embodiment includes a dichroic mirror (or first dichroic mirror) 334c, a dichroic mirror (or second dichroic mirror) 334b, and a dichroic mirror ( Or called the third dichroic mirror) 334a. The dichroic mirror 334c includes a first dichroic layer 333, the dichroic mirror 334b includes a second dichroic layer 335, and the dichroic mirror 334a includes a third dichroic layer 337. In other words, in the present embodiment, the dichroic mirrors 334b, 334c are used instead of the dovetails 332a of the light combining unit 330 of the illumination system 300 described above. In addition, although FIG. 6 is shown, the dichroic mirror 334b and the dichroic mirror 334c are respectively separated into two pieces to facilitate the dichroic mirror. 334a forms a light combining unit 330a. However, in other embodiments, the dichroic mirror 334a may be split into two pieces to form a light combining unit with the dichroic mirrors 334b and 334c.

Figure 7 is a schematic illustration of an illumination system in accordance with another embodiment of the present invention. Referring to FIG. 7, the illumination system 300b of the present embodiment is similar to the illumination system 300 of FIG. 4, and only the differences will be described below. The second light source unit 320b of the illumination system 300b of the present embodiment may provide a fourth color light beam 323x in addition to the third color light beam 323g, and the fourth light separation layer 339 may be further included in the light combining unit 330b. The third dichroic layer 337 and the fourth dichroic layer 339 extend substantially in the same direction and are not parallel to each other. The fact that the third dichroic layer 337 and the fourth dichroic layer 339 extend substantially the same direction means that the third dichroic layer 337 and the fourth dichroic layer 339 are one of the X-shaped arms.

In the above, the fourth dichroic layer 339 is adapted to reflect the fourth color light beam 323x and pass the first color light beam 313r, the second color light beam 313b and the third color light beam 323g, and the first color separation layer 333 and the second color separation layer Layer 335 and third dichroic layer 337 are adapted to pass fourth color beam 323x. The first color light beam 313r, the second color light beam 313b, the third color light beam 323g, and the fourth color light beam 323x reflected by the light combining unit 330b form the illumination light beam 302.

Specifically, the light combining unit 330b includes a dovetail (or first dovetail) 332a and a dovetail (or second dovetail) 332b. The dovetail 332b intersects the dovetail 332a. The dovetail 332a has been described in the above embodiment and will not be repeated here. Further, the dovetail 332b has a third surface 336c opposite to the second light source unit 320b and a fourth surface 336d opposite the third surface 336c. The third dichroic layer 337 is disposed on the third surface 336c, and the fourth dichroic layer 339 is disposed on the fourth surface 336d.

In addition, similar to the above embodiment, in order to improve the problem of spot misalignment and projection angle deflection, the illumination system 300b also has the third dichroic layer 337 and the fourth color separation. The angles of the layers 339 are designed to be non-parallel. Specifically, the angles of the third dichroic layer 337 and the fourth dichroic layer 339 are respectively rotated by a reference plane (or second reference plane) P2 in the opposite direction by a third predetermined angle θ 3 and a fourth. The angle θ is predetermined. The angle between a normal vector (or second normal vector) N2 of the reference plane P2 and the optical axes of the third color beam 323g and the fourth color beam 323x is 45 degrees, and the third predetermined angle θ 3 and the fourth predetermined The angle θ 4 is less than 45 degrees and greater than 0 degrees. In an embodiment, the third predetermined angle θ 3 and the fourth predetermined angle θ 4 are respectively between 10 degrees and 15 degrees, respectively.

In the illumination system 300b of the embodiment, since the second light source unit 320b can also provide light beams of two colors (ie, the third color light beam 323g and the fourth color light beam 323x), it helps to improve the color performance of the projection device. For example, the third color light beam 323g and the fourth color light beam 323x may be green light beams having different wavelength ranges.

Figure 8 is a schematic illustration of a lighting device in accordance with still another embodiment of the present invention. Referring to FIG. 8, the illumination system 300c of the present embodiment is similar to the illumination system 300b described above, with the difference being the light combining unit. In more detail, the light combining unit 330c of the embodiment includes a dichroic mirror (or first dichroic mirror) 334b, a dichroic mirror (or second dichroic mirror) 334c, and a dichroic mirror (or third). A dichroic mirror 334a and a dichroic mirror (or fourth dichroic mirror) 334d. The dichroic mirror 334b includes a first dichroic layer 333, the dichroic mirror 334c includes a second dichroic layer 335, the dichroic mirror 334a includes a third dichroic layer 337, and the dichroic mirror 334d includes a fourth dichroic layer 339. In other words, the light combining unit 330c of the present embodiment replaces the dovetail 332a of the light combining unit 330b of the illumination system 300b with the dichroic mirrors 334b and 334c, and replaces the above combined light with the dichroic mirrors 334a and 334d. The dovetail 332b of unit 330b.

In summary, embodiments of the present invention have at least one of the following advantages:

1. Since the first light source unit and the second light source unit are disposed on opposite sides of the light combining unit, the space utilization rate can be effectively improved, thereby reducing the size of the illumination system.

2. Since the projection system used in the projection apparatus of the embodiment of the present invention has a small size, it has an advantage of a small size.

3. The first light source unit and the second light source unit of the embodiment of the present invention can adopt a small-sized point light source as compared with the conventional light source including the lamp cover and the bulb, thereby contributing to further reducing the size of the illumination system.

4. The embodiment of the present invention designs the first dichroic layer and the second dichroic layer to be non-parallel, which can effectively improve the problem of spot misalignment and projection angle deflection.

Although the present invention has been disclosed in the above preferred embodiments, it is not intended to limit the invention, and it is intended to be a part of the invention. The scope of protection of the present invention is therefore defined by the scope of the appended claims. In addition, any of the objects or advantages or features of the present invention are not required to be achieved by any embodiment or application of the invention. In addition, the abstract sections and headings are only used to assist in the search of patent documents and are not intended to limit the scope of the invention.

1‧‧‧Light source

2, 3‧‧‧ lens array

4‧‧‧ polarizer

5a, 5b, 5c‧‧ ‧ dichroic mirror

6a, 6b‧‧‧ concentrating elements

7‧‧‧Rotating polyhedral reflector

8‧‧‧Polarizing beam splitter

9‧‧‧LCD panel

10‧‧‧Light source

11‧‧‧Projection lens

20‧‧‧Color separation optical system

21, 22G1, 23R‧‧ ‧ dichroic mirror

22B, 23G2‧‧‧ mirror

31, 32‧‧‧ LCD panel

50‧‧‧Combined components

60‧‧‧Projection lens

100‧‧‧Lighting system

115‧‧‧Optical component group

117‧‧‧Light valve

118‧‧‧Condenser

120R, 120G, 120B‧‧‧ dichroic mirror

172, 172', 172" ‧ ‧ light source module

194R, 194G, 194B, 194R', 194G', 194B', 194R", 194G", 194B" ‧ ‧ luminescent elements

R‧‧‧Red Beam

G1‧‧‧First Green Beam

G2‧‧‧second green beam

B‧‧‧Blue Beam

W‧‧‧White light beam

200, 200’‧‧‧projector

210‧‧‧Light valve

220‧‧‧Projection lens

230‧‧‧Mirror

240‧‧ ‧ field mirror

250‧‧‧Internal total reflection稜鏡

300, 300a, 300b, 300c‧‧‧ lighting systems

302‧‧‧ illumination beam

303‧‧•Image beam

310‧‧‧First light source unit

312r‧‧‧first point source

312b‧‧‧second point source

313r‧‧‧first color beam

313b‧‧‧second color beam

320, 320b‧‧‧second light source unit

322g‧‧‧third point source

323g‧‧‧third color beam

323x‧‧‧fourth color beam

330, 330a, 330b, 330c‧‧ ‧ light unit

332a, 332b‧‧‧ wedge shape

333‧‧‧ first dichroic layer

334a, 334b, 334c‧‧ ‧ dichroic mirror

335‧‧‧Second color separation layer

336a‧‧‧ first surface

336b‧‧‧ second surface

336c‧‧‧ third surface

336d‧‧‧ fourth surface

337‧‧‧ third dichroic layer

339‧‧‧ fourth dichroic layer

340‧‧‧First collimating element

350‧‧‧Second collimating element

360‧‧‧Lens Array

370‧‧‧ concentrating elements

P1, P2‧‧‧ reference plane

N1, N2‧‧‧ normal vector

θ 1‧‧‧first predetermined angle

θ 2‧‧‧second predetermined angle

θ 3‧‧‧ third predetermined angle

θ 4‧‧‧ fourth predetermined angle

1 is a schematic diagram of a conventional illumination system of a projection device.

2 is a schematic view of another conventional projection device.

3 is a schematic view of another conventional projection device.

4 is a schematic diagram of a projection apparatus according to an embodiment of the present invention.

FIG. 5 is a schematic diagram of a projection apparatus according to another embodiment of the present invention.

Figure 6 is a schematic illustration of an illumination system in accordance with another embodiment of the present invention.

Figure 7 is a schematic illustration of an illumination system in accordance with another embodiment of the present invention.

Figure 8 is a schematic illustration of a lighting device in accordance with still another embodiment of the present invention.

200. . . Projection device

210. . . Light valve

220. . . Projection lens

230. . . Reflector

240. . . Field mirror

300. . . Lighting system

302. . . Illumination beam

303. . . Image beam

310. . . First light source unit

312r. . . First light source

312b. . . Second point source

313r. . . First color beam

313b. . . Second color beam

320. . . Second light source unit

322g. . . Third point source

323g. . . Third color beam

330. . . Light unit

332a. . . Wedge

333. . . First dichroic layer

334a. . . Dichroic mirror

335. . . Second dichroic layer

336a. . . First surface

336b. . . Second surface

337. . . Third dichroic layer

340. . . First collimating element

350. . . Second collimating element

360. . . Lens array

370. . . Concentrating element

P1. . . Reference plane

N1. . . Normal vector

Θ1. . . First predetermined angle

Θ2. . . Second predetermined angle

Claims (20)

An illumination system comprising: a first light source unit adapted to provide a first color light beam and a second color light beam; a second light source unit opposite the first light source unit and adapted to provide a third color light beam And a light combining unit disposed between the first light source unit and the second light source unit, the light combining unit having a first color separation layer, a second color separation layer and a third color separation layer, The first dichroic layer and the second dichroic layer have substantially the same extending direction and are not parallel to each other, and the third dichroic layer respectively intersects the first dichroic layer and the second dichroic layer, wherein the first sub-division The color layer is adapted to reflect the first color beam and is adapted to pass the second color beam and the third color beam, the second dichroic layer being adapted to reflect the second color beam and adapted to be the third color beam Passing, the third color separation layer is adapted to reflect the third color light beam and is adapted to pass the second color light beam and the first color light beam, and the first color light beam and the second light reflected by the light combining unit The color beam and the third color beam form an illumination beam. The illumination system of claim 1, wherein the light combining unit comprises: a dovetail having a first surface opposite the first light source unit and a second surface opposite the first surface The first dichroic layer is disposed on the first surface, and the second dichroic layer is disposed on the second surface; and a dichroic mirror intersecting the dovetail, and the dichroic mirror includes the third Separation layer. The illumination system of claim 1, wherein the light combining unit comprises: a first dichroic mirror comprising the first dichroic layer; and a second dichroic mirror comprising the second dichroic layer; And a third dichroic mirror including the third dichroic layer. The illumination system of claim 1, wherein the first light source unit comprises a first point source and a second point source, and the second source unit comprises a third point source. The illumination system of claim 4, wherein the first point source, the second point source and the third point source are light emitting diodes. The illumination system of claim 4, wherein one of the first point source and the second point source is a blue light source, and the first point source and the second point source are each a red light source And the third point source is a green light source. The illumination system of claim 1, wherein the first dichroic layer and the second dichroic layer are rotated by a reference plane in opposite directions by a first predetermined angle and a second predetermined An angle between a normal vector of the reference plane and an optical axis of the first color beam and the second color beam is 45 degrees, and the first predetermined angle and the second predetermined angle are less than 45 degrees and greater than 0 degree. The illumination system of claim 7, wherein the first predetermined angle and the second predetermined angle are between 10 and 15 degrees, respectively. The illumination system of claim 1, wherein the second light source unit is further adapted to provide a fourth color light beam, and the light combining unit further has a fourth color separation layer, the third color separation layer and The fourth dichroic layer has substantially the same extending direction and is not parallel to each other, and the fourth dichroic layer is adapted to reflect the fourth color beam and is adapted to make the first color beam, the second color beam and the third color And passing the light beam, and the first color separation layer, the second color separation layer and the third color separation layer are adapted to pass the fourth color light beam, and the first color light beam reflected by the light combining unit, the first The dichroic beam, the third color beam, and the fourth color beam form the illumination beam. The illumination system of claim 9, wherein the light combining unit comprises: a first dovetail having a first surface opposite to the first light source unit and a first surface opposite to the first surface a second surface, the first dichroic layer is disposed on the first surface, the second dichroic layer is disposed on the second surface; and a second dovetail intersects the first dovetail, the second wedge The 稜鏡 has a third surface opposite to the second light source unit and a fourth surface opposite to the third surface, the third color separation layer is disposed on the third surface, and the fourth color separation layer is disposed on the The fourth surface. The illumination system of claim 9, wherein the light combining unit comprises: a first dichroic mirror comprising the first dichroic layer; and a second dichroic mirror comprising the second dichroic layer; a third dichroic mirror including the third dichroic layer; and a fourth dichroic mirror including the fourth dichroic layer. The lighting system of claim 9, wherein the first dichroic layer and the second dichroic layer are rotated by a first predetermined angle and a first predetermined angle by a first reference plane. a predetermined angle, an angle between a first normal vector of the first reference plane and an optical axis of the first color light beam and the second color light beam is 45 degrees, and the third color separation layer and the fourth color point The tiling angle of the color layer is respectively rotated by a second reference plane to a third predetermined angle and a fourth predetermined angle in opposite directions, a second normal vector of the second reference plane and the third color beam and the fourth The angle between the optical axes of the color beams is 45 degrees, and the first predetermined angle, the second predetermined angle, the third predetermined angle and the fourth predetermined angle are less than 45 degrees and greater than 0 degrees. The illumination system of claim 12, wherein the first predetermined angle, the second predetermined angle, the third predetermined angle, and the fourth predetermined angle are between 10 degrees and 15 degrees, respectively. The illumination system of claim 1, further comprising: a first collimating element disposed between the first light source unit and the light combining unit; and a second collimating element disposed in the first Between the two light source units and the light combining unit. The illumination system of claim 1, further comprising a lens array or an optical integration column disposed on the transmission path of the illumination beam. The illumination system of claim 1, further comprising a concentrating element disposed on the transmission path of the illumination beam. A projection apparatus comprising: an illumination system comprising: a first light source unit adapted to provide a first color light beam and a second color light beam; a second light source unit opposite the first light source unit and adapted to Providing a third color light beam; and a light combining unit disposed between the first light source unit and the second light source unit, the light combining unit having a first color separation layer, a second color separation layer, and a first color separation layer a third color separation layer, wherein the first color separation layer and the second color separation layer extend substantially in the same direction and are not parallel to each other, and the third color separation layer respectively intersects the first color separation layer and the second color separation layer The first dichroic layer is adapted to reflect the first color beam and is adapted to pass the second color beam and the third color beam, the second dichroic layer being adapted to reflect the second color beam and adapted Passing the third color beam, the third color separation layer is adapted to reflect the third color beam and is adapted to pass the second color beam and the first color beam, and is reversed by the light combining unit The first color beam, the second color beam and the third color beam form an illumination beam; a light valve is disposed on the transmission path of the illumination beam, and the light valve is adapted to convert the illumination beam into an image a light beam; and a projection lens disposed on the transmission path of the image beam. The projection device of claim 17, further comprising a mirror disposed between the light valve and the projection lens. The projection device of claim 17, further comprising a mirror disposed on the transmission path of the illumination beam to reflect the illumination beam to the light valve. The projection device of claim 17, further comprising an internal total reflection 稜鏡 disposed between the light valve and the projection lens.