DE102006014604B4 - Light combination / projection system for outputting light beams with the same polarization state - Google Patents

Abstract

Light combining / projection system for outputting light beams having the same polarization state, comprising:
a light emitting module (6) for generating two predetermined light beams emitted in a first plane;
a dichroic mirror (5) disposed adjacent to one side of the light emitting module (6) for separating one of the two predetermined light beams into a first color light beam and a second color light beam;
a reflective mirror module (4) having first, second and third reflective mirrors (41, 42, 43), the first reflective mirror (41) being located adjacent one side of the dichroic mirror (5) for receiving and reflecting the first color light beam perpendicular to the first plane, the second reflective mirror (42) disposed adjacent to the other side of the dichroic mirror (5) for receiving and reflecting the second color light beam perpendicular to the first plane and the third reflective mirror (43) first mirror (41) is arranged opposite, for receiving and reflecting the other predetermined light beam, ...

Description

The The invention relates to a light combination / projection system for Output of light beams with the same polarization state and in particular relates to a light emission module, a dichroic Mirror, a reflective mirror module, a PBS module, an image display module and a light combining module, which are all coupled together for generating light beams having the same polarization state.

by virtue of the development of optical and projective display technology become digital projection devices with a high number of dots per inch and pixels often for briefings, meetings, conferences and training used. They also became an important device for family entertainment. Such potential consumers are watching after a light digital projection device with a high picture quality and -lightness, all together, of course, for a reasonable price.

With reference to the 1 and 2 For example, a prior art light combining / projection system has an X-cube 1a , a first and a second λ / 2 plate ( 21a and 22a ), a first, a second and a third PBS (polarizing beam splitter) ( 31a . 32a and 33a ), first, second and third LCOS (liquid crystal on silicon) panels ( 41a . 42a and 43a ) and a dichroic mirror 5a on.

The λ / 2 plates 21a and 22a are polarization conversion elements, and the λ / 2 plates 21a respectively. 22a are each on two opposite sides of the X-cube 1a arranged. The first PBS 31a is at the λ / 2 plate 21a arranged, the second PBS 32a is on another side of the X-cube 1a arranged and the third PBS 33a is at the λ / 2 plate 22a arranged. The first, second and third LCOS panels ( 41a . 42a and 43a ) are next to each of the first, second and third PBS ( 31a . 32a and 33a ) arranged. In addition, the dichroic mirror 5a in a corner position between the second PBS 32a and the third PBS 33a arranged.

With reference to 2 which is a plan view showing the invention, which is a first light-emitting element 61a for generating a blue polarization beam, that is, a blue (B) polarization beam Bs with s-polarization state (the line with small circles). The Bs beam will go over the first PBS 31a received and on the first LCOS panel 41a reflected. The Bs beam is then passed over the LCOS panel 41a into a blue (B) polarization beam Bp with images (the line with horizontal arrows) converted to p-polarization state. In addition, the Bp-ray is converted with images into the Bs-ray with images.

According to the same principles, the invention provides a second light-emitting element 62a for generating a green / red polarization beam, that is, a G / R (green / red) polarization beam Gs / Rs with s-polarization state (the line with small circles). The Gs / Rs beam is through the dichroic mirror 5a into a G (green) polarization beam Gs with s-polarization state and an R (red) polarization beam Rs with s-polarization state separated. Further, the Gs beam and the Rs beam are respectively transmitted through the second PBS 32a or the third PBS 33a on the second LCOS panel 42a or the third LCOS panel 43a received and reflected. The Gs-ray and the Rs-ray are respectively transmitted through the second LCOS-panel 42a or the third LCOS panel 43a into a G-polarization beam Gp with images (the line with horizontal arrows) with p-polarization state and an R-polarization beam Rp with images (the line with horizontal arrows) with p-polarization state converted. In addition, the Rp-ray is converted with images into the Rs-ray with images.

Finally, the Bs beam is combined with images, the Gp beam with images, and the Rs beam with images and across the X cube 1a projected out.

However, the Bs beam with images, the Gp beam with images, and the Rs beam with images do not have the same polarization state. Consequently, known projectors can not represent a uniform image (frame). In addition, not only are the first and second λ / 2 plates more expensive, they also create stresses due to position and heat dissipation problems associated with the first λ / 2 plate 21a and the second λ / 2 plate 22a affect. As a result, the quality of the projected image is affected.

WO 2005/057939 A1 discloses a light combining and projection system having a white light source, an X-cube for separating different colors, and polarizing beam splitters separate from the light combining module.

WO 2006/023180 A1 and WO 2005/060619 A2 disclose light combining and projection systems where the light rays propagate in one plane only.

DE 10359753 B3 discloses a device for illuminating a display using two LEDs.

The object of the invention is to provide a light combination / projection system wel generated light beams with the same polarization state. This object is achieved by a light combination / projection system having the features of claim 1. The invention does not require the first and the second λ / 2 plate according to the prior art. Consequently, not only are costs reduced and voltages reduced to the projector, but the invention also provides uniform images due to the light rays having the same polarization state.

One The first aspect of the invention is a light combining / projection system for outputting light beams having the same polarization state. The system has a light emission module, a dichroic mirror, a reflective mirror module, a PBS module, an image display module, and a light combination module. The light emission module is for Generating two predetermined light beams in a first Level to be emitted. The dichroic mirror is for separating one of the two predetermined light beams into one Light beam of the first color and a light beam of the second color next to it one side of the light emitting module.

Further the reflective mirror module has a first, a second and a a third reflective mirror. The first reflective mirror is for receiving and reflecting the light beam of first color perpendicular to the first plane next to a side of the dichroic Mirror arranged, the second reflective mirror is for receiving and reflecting the light beam of second color perpendicular to the first Plane located next to the other side of the dichroic mirror and the third reflective mirror is for receiving and reflecting the other predetermined light beam, the third a light beam Color is perpendicular to the first plane opposite the first reflective one Mirror arranged.

Further For example, the PBS module has a first, a second and a third PBS on, each about the first, the second and the third reflective mirror arranged are each to the light beam of the first, second and third color to receive and to move to a second level parallel to the first level Reflect. The image display module has a first, a second and a third image display panel, each adjacent to the first, the second and the third PBS are arranged to respectively the light beams first, second and third colors to receive and reflect, in each case one image light beam of the first, second and third colors to create. The light combination module is holistically common merged with the first, second and third PBS, respectively to receive the image light beam of first, second and third colors and to project.

It It should be understood that both the preceding general description and the following detailed description are exemplary, and intend to further describe the invention as claimed to give. Other advantages and features of the invention will become apparent the description, the drawings and the claims, the consequences.

The Various objects and advantages of the invention will become apparent from the following detailed description better understood when connected with the attached Drawing is read in the

1 a perspective schematic view of a light combination / projection system according to the prior art;

2 Fig. 12 is a schematic plan view of a prior art light combining / projection system;

3 a perspective schematic view of a light combining / projection system for outputting light beams having the same polarization state according to the invention;

4 Fig. 12 is a schematic plan view of a light combining / projection system for outputting light beams having the same polarization state according to the invention;

5 is a schematic front view of a light combination / projection system for outputting light beams having the same polarization state according to the invention;

6 Fig. 12 is a schematic side view of a light combining / projection system for outputting light beams having the same polarization state according to the invention; and

7 Fig. 10 is a flowchart of a method for a light combining / projection system for outputting light beams having the same polarization state according to the invention.

With reference to the 3 to 6 For example, the invention provides a light combining / projection system for outputting light beams having the same polarization state, which is a light combining module 1 , a PBS module (polarizing beam splitter) 2 , an image display module 3 , a reflective mirror module 4 and a dichroic mirror 5 having.

The PBS module 2 has a first, a second and a third PBS ( 21 . 22 respectively. 23 ), each on three surfaces of the Lichtkombinations module 1 are arranged, wherein the light combination module 1 an X-cube can be.

Furthermore, the image display module has 3 a first, a second and a third image display panel ( 31 . 32 and 33 ), each adjacent to the first, second and third PBS ( 21 . 22 respectively. 23 ), and the image display panel ( 31 . 32 and 33 ) may be a LCOS (Liquid Crystal on Silicon) panel.

Furthermore, the reflective mirror module has 4 a first, a second and a third reflective mirror ( 41 . 42 respectively. 43 ), each under the first, the second and the third PBS ( 21 . 22 respectively. 23 ) are arranged. The dichroic mirror 5 is at a corner position between the first reflective mirror 41 and the second reflective mirror 42 arranged. Furthermore, the system has a light emission module 6 with a first light emitting element 61 and a second light emitting element for respectively generating two predetermined light beams.

-Symbol) von dem dichroitischen Spiegel 5 reflektiert.Back to the 4 and 6 , a method for the light combining / projection system for outputting light beams having the same polarization state will be described as follows: First, the first light emitting element becomes 61 used for generating a red / green polarization beam, which in the front view of 4 an R / G (red / green) polarization beam Rs / Gs (the small circle line) with s-polarization state. The Rs / Gs beam is then from the dichroic mirror 5 into an R (red) polarization polarization ray Rs with s polarization state and a G (green) polarization ray Gs with s polarization state separated. Alternatively, with reference to 5 , the Rs / Gs beam (the X symbol) on the dichroic mirror 5 projected. In 6 the Gs beam (the

Symbol) of the dichroic mirror 5 reflected.

-Symbol) als auch der Gs-Strahl (das

-Symbol) jeweils über den ersten reflektiven Spiegel 41 bzw. den zweiten reflektiven Spiegel 42 reflektiert und auf den ersten PBS 21 bzw. den zweiten PBS 22 nach oben projiziert. Alternativ wird, mit Bezugnahme auf 5, der Rs-Strahl (das

-Sympbol) über den ersten reflektiven Spiegel 41 auf den ersten PBS 21 reflektiert und projiziert, und mit Bezugnahme auf 6 wird der Gs-Strahl (das

-Symbol) über den zweiten reflektiven Spiegel 42 (nicht gezeigt in 6) auf den zweiten PBS 22 reflektiert und projiziert.With reference to 4 Both the Rs beam (the

Symbol) as well as the Gs-ray (the

Symbol) each over the first reflective mirror 41 or the second reflective mirror 42 reflected and on the first PBS 21 or the second PBS 22 projected upwards. Alternatively, with reference to 5 , the Rs Ray (the

-Sympbol) over the first reflective mirror 41 at first PBS 21 reflected and projected, and with reference to 6 the Gs beam (the

Symbol) over the second reflective mirror 42 (not shown in 6 ) on the second PBS 22 reflected and projected.

Further, with reference to 4 , a p-polarized R (red) polarization beam Rp (the line with horizontal arrows) and a p-polarized G (green) polarization beam Gp (the line with horizontal arrows) each over the first PBS 21 or the second PBS 22 on the first image display panel 31 or the second image display panel 32 reflected. Alternatively, with reference to 5 , the Rs ray is transmitted via the first PBS 21 on the first image display panel 31 reflected, and, with reference to 6 , the Gs beam is transmitted through the second PBS 22 on the second image display panel 3 reflected.

Further, with reference to 4 , the Rp beam and the Gp beam across the first image display panel 31 or the second image display panel 32 each converted into an s-polarized R polarization beam Rs with images (the line with small circles) and an s-polarized G polarization beam Gs with images (the line with small circles). Alternatively, with reference to 5 , the Rs beam over the first image display panel 31 converted into a p-polarized R polarization beam Rp with images, and, with reference to FIG 6 , the Gs beam is passed over the second image display panel 32 converted into a p-polarized R-polarization beam Gp with images.

In addition, the second light-emitting element becomes 62 for generating a blue polarization beam (shown using a front view of FIG 4 ), that is, an s-polarized blue (B) polarization beam Bs (the line with small circles). Alternatively, with reference to 5 , the Bs beam (the X symbol) on the third reflective mirror 43 projected. Alternatively, with reference to 6 , the Bs beam from the second light emitting element 62 generated.

-Symbol) reflektiert und nach oben projiziert zu dem dritten PBS 23 über den dritten reflektiven Spiegel 43. Alternativ wird, mit Bezugnahme auf 5, der Bs-Strahl (das

-Symbol) reflektiert und nach oben projiziert zu dem dritten PBS 23 über den dritten reflektiven Spiegel 43.Further, with reference to 4 , the Bs beam (the

Symbol) and projected up to the third PBS 23 over the third reflective mirror 43 , Alternatively, with reference to 5 , the Bs beam (the

Symbol) and projected up to the third PBS 23 over the third reflective mirror 43 ,

Further, with reference to 4 , a p-polarized B polarization beam Bp (the line with horizontal arrows) over the third PBS 23 on the third image display panel 33 reflected. Alternatively, with reference to 5 , the Bs beam is transmitted through the third PBS 23 on the third image display panel 33 reflected.

Further, with reference to 4 , the Bp beam is transmitted via the third image display panel 33 into an s-polarized B-polarization beam Bs with images (the line with small circles) converted. Alternatively, with reference to 5 , the Bs beam over the third image display panel 33 into an s-polarized B polarization beam Bp with Bil changed (the line with small circles).

Finally, with reference to 4 , the Rs-ray with images, the Gs-ray with images and the Bs-ray with images via the light-combining module 1 combined and projected outwards. Alternatively, with reference to the 5 and 6 , the Rp-ray with images, the Gp-ray with images and the Bp-ray with images via the light-combining module 1 combined and projected outwards. Further, the above-mentioned light beam has s-polarized and p-polarized polarization beams. The difference between the s-polarized polarizing rays and the p-polarized polarizing rays depends on their respective different viewing angles (such as vertical direction and horizontal direction).

7 FIG. 12 shows a flowchart of a method for a light combining / projection system for outputting light beams having the same polarization state according to the invention.

Finally, the light combination module 1 , the PBS module 2 , the image display module 3 , the reflective mirror module 4 and the dichroic mirror 5 for producing light beams having the same polarization state all put together. Furthermore, the invention does not require the first and the second λ / 2 plate ( 21a . 22a ) used in the prior art. Consequently, not only is the system less expensive, but less stress is applied to the system, and the invention also provides uniform images because the light rays all have the same polarization state.

Claims (4)

Light combining / projection system for outputting light beams having the same polarization state, comprising: a light emitting module ( 6 ) for generating two predetermined light beams emitted in a first plane; a dichroic mirror ( 5 ) next to one side of the light-emitting module ( 6 ) is arranged for separating one of the two predetermined light beams in a light beam of first color and a light beam of the second color; a reflective mirror module ( 4 ), with a first, a second and a third reflective mirror ( 41 . 42 . 43 ), wherein the first reflective mirror ( 41 ) next to one side of the dichroic mirror ( 5 ) is arranged to receive and reflect the light beam of first color perpendicular to the first plane, the second reflective mirror ( 42 ) next to the other side of the dichroic mirror ( 5 ) for receiving and reflecting the light beam of second color perpendicular to the first plane and the third reflective mirror (FIG. 43 ) the first mirror ( 41 ) is arranged opposite, for receiving and reflecting the other predetermined light beam, which is a light beam of the third color is perpendicular to the first plane; a PBS module ( 2 ) with a first, a second and a third PBS ( 21 . 22 . 23 ), each above the first, second and third reflective mirrors ( 41 . 42 . 43 ) are arranged to receive respectively the first, second and third color light beams and to reflect in a second plane parallel to the first plane; an image display module ( 3 ) with a first, a second and a third image display panel ( 31 . 32 . 33 ), each for receiving and reflecting the first, second and third color light beams adjacent to the first, second and third PBS (FIGS. 21 . 22 . 23 ) are arranged to respectively generate an image light beam of first, second and third colors; and a light combination module ( 1 ), which is holistically shared with the first, second and third PBS ( 21 . 22 . 23 ) to receive and project the first, second and third color image light beams, respectively. System according to claim 1, wherein the light beam is a polarization light beam. The system of claim 1, wherein the first, second and third image display panels ( 31 . 32 . 33 ) LCOS panels are. System according to claim 1, wherein the light combination module ( 1 ) is an X-cube.