CN100368866C - Optical projection system and method - Google Patents
Optical projection system and method Download PDFInfo
- Publication number
- CN100368866C CN100368866C CNB2004100050401A CN200410005040A CN100368866C CN 100368866 C CN100368866 C CN 100368866C CN B2004100050401 A CNB2004100050401 A CN B2004100050401A CN 200410005040 A CN200410005040 A CN 200410005040A CN 100368866 C CN100368866 C CN 100368866C
- Authority
- CN
- China
- Prior art keywords
- light
- liquid crystal
- optical projection
- light beam
- type liquid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Abstract
The present invention relates to an optical projection system and a method thereof. The optical projection system can receive a red light beam, a green light beam and a blue light beam; the projection system comprises a light synthesizing prism; the light beams enter respectively through the three surfaces of the light synthesizing prism; a synthesized light beam is emitted from the other surface; a projection lens set receives and projects the synthesized light beam; each light beam comprises a reflection type liquid crystal panel and a wire grid type light polarizing element, wherein the reflection type liquid crystal panels are correspondingly parallel to the surfaces of the light synthesizing prism; thus, the light beams are reflected to the reflection type liquid crystal panels by the wire grid type light polarizing elements before entering the light synthesizing prism; then, the reflection type liquid crystal panel respectively reflect the light beams in a light polarizing state for causing the light beams to penetrate the wire grid type light polarizing elements and to be irradiated directly facingthe light synthesizing prism.
Description
Technical field
The invention relates to a kind of optical projection system, and particularly relevant for the use wiregrating formula polarization element that can close light with the mode of penetrating.
Background technology
Optical projection system, very general in daily life, for example with a small view data, project on the giant-screen, see for the user and look.Particularly, after other science and technology significantly developed, for example development of lcd technology cooperated optical projection system, can reach the effect of display image.For example lcd projection tv is exactly a kind of modern science and technology product.
For optical projection system, be used liquid crystal display cells, traditional system design is as shown in Figure 1.The traditional optical optical projection system of Fig. 1 is to utilize polarization spectroscope (polarization beamsplitter, characteristics design PBS).One light beam 100 is introduced into a color dispersing mirror 150, and light beam 100 is divided into for example a blue beam 104 and a mixed light bundle 102.This mixed light bundle 102 is to be mixed by green glow and ruddiness.Blue beam 104 is advanced with a path, and mixed light bundle 102 is advanced with another path.Path explanation in this elder generation to blue beam 104.Blue beam 104 then becomes blue beam 106 by the guiding of catoptron 152 and 154, advances towards a polarization spectroscope 158b, through a field lens 156b (fieldlens) and incident.The light component that polarization spectroscope 158b will have a polarization state reflexes to a silicon liquid crystal (liquid crystal on silicon, LCOS) panel 160b.A plurality of pixels are arranged on the silicon liquid crystal panel, generally are to constitute in an array mode.The pixel out of the ordinary of silicon liquid crystal panel can be through control with the polarization of incident light attitude, cooperates the effect of polarization spectroscope and changes its polarization state and reflect it, with the effect of the bright dark and gray shade scale that reaches the color gray shade scale.
In addition, be divided into a red beam 108 and a blue beam 110 through a color dispersing mirror again for 102 of mixed light bundles.When red beam 108 with after blue beam 110 is separated, its light path and blue beam 104 are similar, by forming of the image that divides other polarization spectroscope 158r, 158g and silicon liquid crystal panel 160r, 160g to carry out each primary colors.
Then, three light beams by silicon liquid crystal panel 160r, 160g, 160b institute reflected back are incident in light-combining prism (color-combination prism) 162, with the synthetic light beam of three light beams, and shine projection lens's group 164 by the another side of light-combining prism 162.Wherein, light-combining prism 162 generally can comprise X type cube prism (X-cube).
For the traditional design of Fig. 1, mainly be the design that utilizes polarization spectroscope, it has many shortcomings.The basic functional principle of polarization spectroscope as shown in Figure 2.One unpolarized light is incident in the oblique acting surface 166 of polarization spectroscope, and its light with a polarization state can penetrate, and the light of another polarization state can reflect.Yet for the light beam of a reality, it is not to be some light beams, but with the face incident of a two dimension.Fig. 3 A-3C represents traditional light beam, is incident in the situation of polarization spectroscope.Consult Fig. 3 A, when incident light is face incident with a two dimension, on transverse section as shown, its effect as Fig. 2 machine-processed.Yet,, can't be divided into the light beam of two polarization states fully in other transverse section (not being shown in figure).Consult Fig. 3 B, on the reflecting surface for the two dimension of a circle, its transverse axis representative transverse section shown in Figure 2, it has single polarization state, shown in round dot.Yet the face that departs from transverse axis, another polarization state of can mixing simultaneously is shown in the double-head arrow symbol.Therefore, when being expected at complete dark image, or the details in a play not acted out on stage, but told through dialogues effect, have some light leaks.Consult Fig. 3 C, for example, have light leak in 180 zone.General in present requirement, its bright dark contrast is more than 1000: 1.These light leaks can influence display quality.
In order to solve the problem of above-mentioned polarization spectroscope, then 166 of its interfaces must adopt the glass with low-birefringence characteristic to maintain the characteristic of simple polarization direction.In order to solve the light leak problem, need be coated with compensation rete of one 1/4 wavelength or the like again.
These increase manufacturing cost, also make system be difficult for keeping.Or even need the gradually highly difficult operation of layer plated film.
(wire grid polarizer WGP) replaces polarization spectroscope (PBS) also to propose to utilize wiregrating formula polarization element traditionally in addition.Fig. 4 represents to utilize the optical projection system of wiregrating formula polarization element.Consult Fig. 4, a light source 300 sends a white light, via a color dispersing mirror 302, resolves into a blue beam 304 and a mixed light bundle 306.Earlier do explanation with the gold-tinted beam path of mixed light bundle 306, it is through polymerizable lens (condenser lens) 308, and after after the change direction of catoptron 314, enter another color dispersing mirror 316, is separated into red beam 318 and blue beam.With red beam 318, it is through a wiregrating formula polarization element 320, and the light component that wherein has a polarization state can be by arriving a reflection type liquid crystal panel 322.Reflection type liquid crystal panel 322 arrives wiregrating formula polarization element 320 with a polarization state with beam reflection.At this moment, reflected light has an image.So wiregrating formula polarization element 320 is reflexing to a light-combining prism (color-combination prism) 162 with light beam.For this traditional design, reflection type liquid crystal panel 322 is vertical setting for the corresponding plane of incidence of light-combining prism 162.Light beam is to utilize the reflection of wiregrating formula polarization element 320 and be incident in light-combining prism 162.As for other blue beam (B) 304 and from mixed light bundle 316 isolated blue beam (G), also design in an identical manner.Also comprise use polymerizable lens 310 and transmit mirror 312 for blue beam (B) 304.
The inventor finds the traditional design of Fig. 4, still has some problems, and for example bending of wiregrating formula polarization element causes for example problem of aberration (chromatic aberration) etc.At the problem of being found, the present invention proposes another design, will be in aftermentioned.
In addition, for other traditional optical optical projection system, also Fig. 9 and shown in Figure 10 for example.In Fig. 9, its main traditional design is just to enter color dispersing mirror 806 from the light beam of light source is first through a polymerizable lens 804 polymerizations.And follow-up light path is the design of adopting liquid crystal panel 812.For this design, because polymerizable lens 804 is the monolateral heart far away (telecentricity) or the design of the non-heart far away, (cone angle) is very big for the cone angle of its light, the color dispersing mirror 806 of its back needs the mode of gradient type plated film to form, to reduce because the caused color problem of non-uniform of cone angle.And red beam 802R and blue beam 802G be after color dispersing mirror 818 separates once more, and blue beam 802G also needs to utilize catoptron 822 reflections.Because path is different, also need transmits mirror 820,824 and do and differ adjustment.For the explanation of other detailed path of Fig. 9, should be understood by those skilled in the art as shown, no longer describe in detail.
In addition, Figure 10 utilizes wiregrating formula polarization element 916 to cooperate reflection type liquid crystal panel 918 to design.Right its has identical problem with Fig. 9, promptly is by the first color dispersing mirror 904 that just arrives behind polymerizable lens 902 of the light of light source 900.Because the design of the polymerizable lens 902 right and wrong heart far away, its problem is identical with the design of Fig. 9.The color dispersing mirror needs gradually layer plated film.Because it is non-heart design far away, the light path of each color beam is subjected to the restriction of color dispersing mirror, can not adjust arbitrarily, so the light path of each color beam is not easy to reach aplanatic design again.
Summary of the invention
The present invention includes and propose a kind of optical projection system, be to adopt the design that penetrates wiregrating formula polarization element, and directly to entering light-combining prism, wherein reflection type liquid crystal panel is the corresponding surface of parallel surface to the light-combining prism of incident.
The present invention includes also and to propose a kind of optical projection system in addition, utilize the design of the bilateral heart far away, and first color dispersing mirror is placed in before the bilateral heart group far away, therefore can keep the design of small-angle, need the gradually design of layer plated film to avoid the color dispersing mirror.In addition, the light path of each light beam, but independent design makes and reaches aplanatic effect.
According to feature of the present invention, a kind of optical projection system is proposed, this optical projection system can receive a red beam, a blue beam, and a blue beam.This optical projection system comprises: a light-combining prism, this light-combining prism allow these light beams to be entered by three faces of this light-combining prism respectively, and a synthetic light beam is by the another side outgoing; One projection lens set, this projecting lens group of received should be synthesized light beam to carry out projection.On the light path for each light beam wherein, also comprise a reflection type liquid crystal panel again, and a wiregrating formula polarization element.Wherein these reflection type liquid crystal panels are parallel to these three faces of these light beam institute incidents of correspondence of this light-combining prism.Before these light beams enter this light-combining prism, earlier reflex to these reflection type liquid crystal panels by these wiregrating formula polarization elements, then these reflection type liquid crystal panels respectively with a polarization state with these beam reflection, make to penetrate this wiregrating formula polarization element, and directly towards this light-combining prism incident.
The present invention proposes a kind of optical projection method again, and this projecting method passes through to receive a red beam, a blue beam, and a blue beam, and carry out projection.This method comprises: a light source is provided; Again this light source beam split is become the three primary colors light beam of RGB; Guide these light beams, make to enter a wiregrating formula polarization element respectively and reflex to a reflection type liquid crystal panel.This reflection type liquid crystal panel has a plurality of pixels.Control wherein each pixel of these reflection type liquid crystal panels, make a folded light beam of corresponding these pixels that one polarization state be arranged.Make these light beams, directly penetrate this wiregrating formula polarization element, and be combined into a synthetic light beam by this reflection type liquid crystal panel reflection.
For above and other objects of the present invention, feature and advantage can be become apparent, a preferred embodiment cited below particularly, and in conjunction with the accompanying drawings, be described in detail below:
Description of drawings
Fig. 1 is the synoptic diagram of the traditional optical projection system of expression.
Fig. 2 is the traditional polarization spectroscope mechanism of expression.
Fig. 3 A-3C is the light leak problem of the traditional optical projection system of expression.
Fig. 4 is the synoptic diagram of another traditional optical projection system of expression.
Fig. 5 is the mechanism of the traditional wiregrating formula polarization element of expression.
Fig. 6 is the problem synoptic diagram of traditional optical projection system of expression the present invention discovery.
Fig. 7 represents according to one embodiment of the invention the synoptic diagram of optical projection system.
Fig. 8 is that expression is according to the present invention, in improving mechanism of Fig. 6 optical projection system.
Fig. 9-the 10th represents the synoptic diagram of other traditional optical projection systems.
Figure 11-12 expression is according to the synoptic diagram of other optical projection systems of another embodiment of the present invention.
Description of reference numerals:
100,300,800,900 light sources
150,302,316,602,806,818,904,1100 color dispersing mirrors
152,154,314,612,613,808,908,912,1104 catoptrons
160 formula liquid crystal panels
162,814 light-combining prisms
164,816 projection lens set
180 light leak zones
308,310,312,804,902,910,1004,1008,1012,1016 lens
320,616,916 wiregrating formula polarization elements
614,914 polaroids
812,1010 liquid crystal panels
Embodiment
For the traditional design of above-mentioned Fig. 4, find that through analysis of the present invention it also has problems.If wiregrating formula polarization element 320 for example, because thermal expansion is inhomogeneous or other is former thereby cause bending, and then cause the not parallel reflection of light beam, and cause serious lateral chromatic aberration (lateral color ortransverse dichromatic aberration).
For wiregrating formula polarization element 320, cooperate the running of reflection type liquid crystal panel 322 and light-combining prism 162, traditional operation mechanism basically is as shown in Figure 5.By the light of wiregrating formula polarization element, have a polarization state and arrive reflection type liquid crystal panel 322.Reflection type liquid crystal panel 322 is transformed into another polarization state at the needs of each pixel with polarization state, then reflexes to wiregrating formula polarization element again.Then because the characteristic of wiregrating formula polarization element, the light of incident is reflexed to light-combining prism 162.
At this moment, if 320 bendings of wiregrating formula polarization element, then therefore incident angle can change, and causes light to depart from predetermined light path.Can interfere with each other between the pixel.With regard to the requirement of image, lateral chromatic aberration should not depart from and surpass a pixel.And present Pixel Dimensions is 10 * 10 little millimeters squares.Therefore, BEAM SQUINT needs less than 10 little millimetres, yet it is difficult for reaching.
Therefore the present invention proposes the penetration design of Fig. 7.In Fig. 7, light source 300 provides a light beam, is separated into a primary colour beam 604 and a mixed light bundle 606 through color dispersing mirror 602.Primary colour beam 604 is incident in a polaroid 614 through catoptron 612 and 613 with it.This polaroid 614 can be according to the design requirement setting, and to obtain a polarization state, it can cooperate the characteristic of wiregrating formula polarization element 616 to use.Light beam is incident in wiregrating formula polarization element 616 after polaroid 614, the light component that it will have a polarization state reflexes to a reflection type liquid crystal panel 618.Utilize the characteristic of reflection type liquid crystal panel 618, with polarization state again appropriate change then reflex to wiregrating formula polarization element 616, penetrate wiregrating formula polarization element 616, directly advance to light-combining prism 612 forward.Special arrangements of the present invention make reflection type liquid crystal panel 618, are parallel to the plane of incidence of light-combining prism 162.In addition, mixed light bundle 606 is separated into light beam 608,610 through a color dispersing mirror again.Then its path is identical with the design of light beam 604, no longer describes.
For the penetration design of the present invention of Fig. 7, reflection type liquid crystal panel 618 is in the face of the plane of incidence of light-combining prism 162, to be arranged in parallel.Its mechanism as shown in Figure 8.When light from reflection type liquid crystal panel 618 reflections, when entering wiregrating formula polarization element 616, though 616 bendings of wiregrating formula polarization element, its influence only be displacement slightly, by the light of wiregrating formula polarization element 616, still about keeping parallelism and be incident in light-combining prism 162.Therefore, can effectively avoid the phenomenon of lateral chromatic aberration.
The design of Fig. 7 of the present invention, though also utilize wiregrating formula polarization element and reflection type liquid crystal panel to design, the problem shortcoming of being found according to the present invention of design traditionally, and propose with different arrangement paths, can effectively avoid, and cause the problem of lateral chromatic aberration because of light departs from light path.
The present invention proposes again in addition to utilize the design of the bilateral heart far away, and makes source of parallel light earlier through the color dispersing mirror again at the traditional design problem of Fig. 9～10.The cone angle that so is incident in the color dispersing mirror can keep low-angle, makes the color dispersing mirror be easy to make, and needn't make gradually layer plated film.And utilize the design of the bilateral heart far away, but make the light path independent design, to reach aplanatic effect.
Figure 11～12 expressions optical projection system of the present invention.Consult Figure 11, the white light of directional light enters color dispersing mirror 1000, and is separated into a primary colour beam and a mixed light bundle, and for example a red beam 1002R and a bluish-green mixed light bundle comprise blue beam 1002B and blue beam 1002G.With regard to red beam 1002R explanation earlier in bilateral heart design far away, its heart group bilateral far away through for example being constituted by polymerizable lens 1004 and field lens 1008.Can comprise also again that wherein a catoptron 1006 arrives desired direction in suitable position with red beam 1002R deviation.In addition, bluish-green mixed light bundle is for example similar with red beam 1002R, through the design of another bilateral heart group far away, is then separated by another color dispersing mirror 1018 again.Last three light beams close light by three face incidents of light-combining prism 814 respectively.Close the light beam that closes behind the light, shine a projection lens set 806 from the another side of light-combining prism 814.
In this embodiment, how will with synthetic different designs can be arranged by the light beam guiding of bilateral heart group far away.Figure 12 is another design variation.Light source 900 provides a collimated white light and is incident in coloured silk penetrates spectroscope 1100, and it is separated into a primary colour beam and a mixed light bundle, and for example a red beam 1102R and a bluish-green mixed light bundle comprise blue beam 1102B and blue beam 1102G.With regard to red beam 1102R explanation earlier, its heart group bilateral far away through for example being constituted by lens combination 1106.Can comprise also again that wherein a catoptron 1104 arrives desired direction in suitable position with the light beam deviation.In addition, bluish-green mixed light bundle and red beam 1002R are similar, through the design 1118 of another bilateral heart group far away, are then separated by another color dispersing mirror 1120 again.At last, three light beams close light by three face incidents of light-combining prism 814 respectively.Close the light beam that closes behind the light, shine a projection lens set 816 from the another side of light-combining prism 814.
In the design of Figure 12, the part in the path after bilateral heart design far away can be described as again and closes the optical projection unit.Though, on the design feature with regard to this embodiment, do not limit the particular design of closing the optical projection unit.Yet, preferable design, still the principle of design with Fig. 7 is preferable.In Figure 12, for example red beam enters a polaroid 1110 through catoptron 1108 deviations, and it can make the light with a polarization state be incident in wiregrating formula polarization element 1112, and reflexes to reflection type liquid crystal panel 1114.Reflection type liquid crystal panel 1114 penetrated wiregrating formula polarization element 1112 with after the beam reflection, then a corresponding surface of direct directive light-combining prism 814.
The present invention for the design of Fig. 7, has at least price cheap as a complete unit, and the details in a play not acted out on stage, but told through dialogues uniformity coefficient is good, does not need quarter wave plate (quarter wave plate), contrasts advantages such as good.
The present invention for example has several advantages again at least with regard to the design of the bilateral heart far away, low cost of manufacture, and this is because the color dispersing mirror does not need gradually layer plated film.The out of focus that image is small can not influence the quality of imaging.The aligning of light valve component is easier to.Light path separately can design according to the light path demand respectively.There is not gradually the color dispersing mirror of layer plated film can not cause the phenomenon of color inequality.
Though the present invention with a preferred embodiment openly as above; yet it is not in order to limit the present invention; any those skilled in the art; without departing from the spirit and scope of the present invention; certainly can do some and change and retouching, so being as the criterion of should being defined with claims scope of applying for a patent of protection scope of the present invention.
Claims (14)
1. optical projection system, this optical projection system can receive one first light beam, one second light beam, and one the 3rd light beam, this optical projection system comprises:
One light-combining prism, this light-combining prism allow these light beams respectively by three face incidents of this light-combining prism, and a synthetic light beam is by the another side outgoing;
One projection lens set, this projecting lens group of received should be synthesized light beam to carry out projection; And
On the light path for each light beam wherein, also comprise:
One reflection type liquid crystal panel; And
One wiregrating formula polarization element,
Wherein these reflection type liquid crystal panels are parallel to these three faces of these light beam institute incidents of correspondence of this light-combining prism, wherein before these light beams enter this light-combining prism, earlier reflex to these reflection type liquid crystal panels by these wiregrating formula polarization elements, these reflection type liquid crystal panels then, respectively with a polarization state with these beam reflection, make them penetrate this wiregrating formula polarization element, and directly towards this light-combining prism incident.
2. optical projection system as claimed in claim 1 is characterized in that: wherein each wiregrating formula polarization element passes through the light component with one first polarization state, and makes the light component reflection with one second polarization state.
3. optical projection system as claimed in claim 1 is characterized in that: wherein each reflection type liquid crystal panel comprises a plurality of pixels, can change over an incident polarization attitude respectively, makes it become desired this polarization state, to penetrate these wiregrating formula polarization elements.
4. optical projection system as claimed in claim 3 is characterized in that: these reflection type liquid crystal panels provide a gradation of image grade point by this polarization state.
5. optical projection system as claimed in claim 1 is characterized in that: this light-combining prism comprises an X type cube prism.
6. optical projection system as claimed in claim 1 is characterized in that: also comprise one first color dispersing mirror, this first color dispersing mirror is divided into one first primary colour beam and a colour mixture light beam with a light source.
7. optical projection system as claimed in claim 6 is characterized in that: also comprise one second color dispersing mirror, this second color dispersing mirror is divided into one second primary colour beam and a three primary colors light beam with this colour mixture light beam.
8. optical projection system as claimed in claim 1 is characterized in that: wherein also comprise a polaroid on the light path of each light beam, so that these light beams are reflected earlier on these wiregrating formula polarization elements.
9. optical projection system as claimed in claim 1 is characterized in that: these reflection type liquid crystal panels comprise the silicon liquid crystal panel.
10. optical projection method, this projecting method can receive one first light beam, one second light beam, and one the 3rd light beam, and carry out projection, this optical projection method comprises:
One light source is provided;
This light source beam split is become these light beams;
Guiding is each light beam wherein, enters a wiregrating formula polarization element respectively, and reflexes to a reflection type liquid crystal panel, and wherein each reflection type liquid crystal panel has a plurality of pixels;
Control wherein each pixel of these reflection type liquid crystal panels, make a folded light beam of corresponding these pixels that one polarization state be arranged; And
Guiding directly penetrates this wiregrating formula polarization element by these light beams of this reflection type liquid crystal panel reflection, and is combined into a synthetic light beam.
11. optical projection method as claimed in claim 10 is characterized in that: this wiregrating formula polarization element can make the light component with one first polarization state pass through, and makes the light component reflection with one second polarization state.
12. optical projection method as claimed in claim 10 is characterized in that: this reflection type liquid crystal panel comprises a silicon liquid crystal panel.
13. optical projection method as claimed in claim 10 is characterized in that: in guiding this step, comprise and use a light-combining prism to obtain this synthetic light beam by these light beams of this reflection type liquid crystal panel reflection.
14. optical projection method as claimed in claim 13 is characterized in that: this light-combining prism comprises an X type cube prism.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100050401A CN100368866C (en) | 2004-02-16 | 2004-02-16 | Optical projection system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100050401A CN100368866C (en) | 2004-02-16 | 2004-02-16 | Optical projection system and method |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006101515528A Division CN100392469C (en) | 2004-02-16 | 2004-02-16 | Optical projection system and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1658015A CN1658015A (en) | 2005-08-24 |
| CN100368866C true CN100368866C (en) | 2008-02-13 |
Family
ID=35007610
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100050401A Expired - Fee Related CN100368866C (en) | 2004-02-16 | 2004-02-16 | Optical projection system and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100368866C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110658708B (en) * | 2019-09-02 | 2021-09-07 | 杭州辰景光电科技有限公司 | SLMs array splicing method, splicing piece and splicing frame thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5239322A (en) * | 1990-05-16 | 1993-08-24 | Victor Company Of Japan, Ltd. | Display apparatus |
| US5513023A (en) * | 1994-10-03 | 1996-04-30 | Hughes Aircraft Company | Polarizing beamsplitter for reflective light valve displays having opposing readout beams onto two opposing surfaces of the polarizer |
| US6637886B2 (en) * | 1998-02-16 | 2003-10-28 | Seiko Epson Corporation | Projection display device |
| US6654171B1 (en) * | 1999-04-22 | 2003-11-25 | Stn Atlas Electronik Gmbh | Image projector |
| US6666556B2 (en) * | 1999-07-28 | 2003-12-23 | Moxtek, Inc | Image projection system with a polarizing beam splitter |
-
2004
- 2004-02-16 CN CNB2004100050401A patent/CN100368866C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5239322A (en) * | 1990-05-16 | 1993-08-24 | Victor Company Of Japan, Ltd. | Display apparatus |
| US5513023A (en) * | 1994-10-03 | 1996-04-30 | Hughes Aircraft Company | Polarizing beamsplitter for reflective light valve displays having opposing readout beams onto two opposing surfaces of the polarizer |
| US6637886B2 (en) * | 1998-02-16 | 2003-10-28 | Seiko Epson Corporation | Projection display device |
| US6654171B1 (en) * | 1999-04-22 | 2003-11-25 | Stn Atlas Electronik Gmbh | Image projector |
| US6666556B2 (en) * | 1999-07-28 | 2003-12-23 | Moxtek, Inc | Image projection system with a polarizing beam splitter |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1658015A (en) | 2005-08-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP3768381B2 (en) | LCD projector | |
| US20220004014A1 (en) | Optical Devices and Systems with Dichroic Beamsplitter Color Combiner | |
| US20020057420A1 (en) | Projection-type display apparatus | |
| US20070216869A1 (en) | Projection type image display apparatus | |
| US6439724B1 (en) | Color projector | |
| US20050195369A1 (en) | Optical element and projection image display apparatus using the same | |
| CN106019789A (en) | Optical engine of color projection display | |
| US7252384B2 (en) | Three-panel projection display apparatus for displaying color images | |
| JPH08297283A (en) | Liquid crystal display device and its luminous flux separating method | |
| CN100472277C (en) | Illumination optical system and image projection apparatus | |
| US7359122B2 (en) | Prism assembly | |
| KR100381050B1 (en) | Optical System Of Liquid Crystal Projector | |
| CN100368866C (en) | Optical projection system and method | |
| CN100392469C (en) | Optical projection system and method | |
| KR20030079268A (en) | A projection display system | |
| US7086738B2 (en) | Optical projection system and method | |
| JP5200337B2 (en) | Display device | |
| JP2011257645A (en) | Projector | |
| KR100264105B1 (en) | Projection type color image display apparatus | |
| CN110471246B (en) | Optical machine adjusting system and method | |
| EP3770681A1 (en) | Image display device | |
| US6525785B2 (en) | Projection apparatus using L-shaped dichroic prism set having a cubically glass block juxtaposed to a dichroic prism for passing light beams without changing direction of the light beams | |
| JP2000010050A (en) | Projector optical system | |
| JPH04310913A (en) | Image formation optical system with optical splitter | |
| TWI231883B (en) | Off-axis image projecting system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080213 Termination date: 20100216 |