CN101539669A - Reflective liquid crystal projecting apparatus - Google Patents
Reflective liquid crystal projecting apparatus Download PDFInfo
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- CN101539669A CN101539669A CN200810065591A CN200810065591A CN101539669A CN 101539669 A CN101539669 A CN 101539669A CN 200810065591 A CN200810065591 A CN 200810065591A CN 200810065591 A CN200810065591 A CN 200810065591A CN 101539669 A CN101539669 A CN 101539669A
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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 101
- 230000010287 polarization Effects 0.000 claims abstract description 39
- 230000003287 optical effect Effects 0.000 claims description 45
- 230000015572 biosynthetic process Effects 0.000 claims description 13
- 239000003292 glue Substances 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000003384 imaging method Methods 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 238000002834 transmittance Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
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Abstract
The invention discloses a reflective liquid crystal projecting apparatus, which comprises a projecting light path structure consisting of an illuminating source, a light splitting and combining device, reflective liquid crystal panels and a projection lens, wherein the light splitting and combining device consists of four PBS and four half-wave plates, the four PBS are arranged adjacent to each other and polarization light-splitting planes thereof form a forked shape integrally, and the four half-wave plates are arranged between each two PBS respectively. The illuminating source, the light splitting and combining device and the projection lens are arranged sequentially along the same central line; a single or two pieces of the reflective liquid crystal panels are positioned on the lateral surfaces of the light splitting and combining device and are placed in parallel with the central line, thus the liquid crystal projecting apparatus with a linear light path structure is obtained and can be made into a needed thin-strip shape by microminiaturizing.
Description
Technical field
The present invention relates to LCD projecting system, particularly a kind of projecting light path structure is linear reflective liquid crystal projecting apparatus.
Background technology
The 21 century intense industrialization is with information-based, make portable, hand-held electronic product on market, bring in constant renewal in release with various functions, the recreational instruments such as for example notebook computer, mobile phone, digital camera, MP3 or MP4 that have most typical meaning to change people life style constantly are developed upgrading, find out that easily the development trend of these products is compact towards integrated, functional diversities, volume.
Liquid crystal projector is widely used in fields such as education, amusement, business activities, in view of the market demand, the liquid crystal projector microminiaturization is made into light and handy product, or its microminiaturization is made into suitable shape is embedded on the movable terminations such as mobile phone, MP4, become one of developing direction of liquid crystal projector.
Consider cost and brightness, microminiaturized projector generally adopts monolithic micro display chip or two micro display chips as image device.To adopt monolithic or two silica-based liquid crystal panels (LCOS) is example, traditional optical projection system of this kind liquid crystal projector can comprehensively be Fig. 1, shown in Figure 2, lighting source 1 type is indefinite, can be various light sources, it includes optically focused shaping device and forms an assembly, divide/close photosystem and use a polarizing beam splitter 2 at least, light path is: lighting source 1 sends light inject polarizing beam splitter 2 after, tell polarized light and light LCOS liquid crystal panel 3 and 3 ', liquid crystal panel modulation output image light synthesizes a branch of light through polarizing beam splitter 2 again, from projecting lens 4 outputs.
According to Fig. 1, Fig. 2 as can be seen, this optical projection system light channel structure is " L " type, occupies than large space, adopts the liquid crystal projector entity broad of this structure, and the liquid crystal projector of producing is generally square, and present most of projectors are this shape.
U.S. Pat 6280034 and Chinese patent CN03803103.5 disclose the optical projection system of another structure, see shown in Figure 3, branch wherein/close photosystem by four PBS (polarizing beam splitter) 21,22,23,24 form, lighting source 1 sends light and injects first PBS 21, the P polarized light of telling sees through second PBS 22 and injects LCOS liquid crystal panel 3, the S polarized light of telling from first PBS 21 is injected to be reflected behind the 4th PBS 24 and is entered LCOS liquid crystal panel 3 ', LCOS liquid crystal panel 3 and 3 ' is output image light respectively, injects projecting lens 4 after being synthesized by the 3rd PBS 23 at last.Though the projection arrangement of this structure can obtain the directly entity of long shape, but anatomize its geomery, if with projecting lens 4 is reference, the width dimensions of a projecting lens 4 is corresponding mutually with the width dimensions three of a PBS and a slice liquid crystal panel, and obviously the width dimensions of this projection arrangement is corresponding with the twice of projecting lens 4 width dimensions.The width of this projection arrangement entity is still bigger.
Why so haggle over the width of the liquid crystal projector after microminiaturization is made, be because seek out the liquid crystal projector of elongate, with insert length easily than in the big electronic product of width, the portable terminal that is complementary of mobile phone, MP3 or other shapes for example is not to increase the volume of these carriers as far as possible.
Summary of the invention
Reflective liquid crystal projecting apparatus provided by the invention can microminiaturization be made into fine strip shape, has solved the problems referred to above preferably.This reflective liquid crystal projecting apparatus light channel structure is brand-new, lighting source, polarization conversion light-splitting device, the concentricity line of projecting lens three are disposed in order the formation linear structure, broken the traditional design thinking of reflective liquid crystal projection system, because at present only adopting single-slice transmission type LCD liquid crystal panel just can be designed to linear structure in as the optical projection system of imager chip.Especially the present invention adopts the projection arrangement of two reflection type liquid crystal panels also to realize can being made into fine strip shape by microminiaturization by the linear pattern light channel structure simultaneously, improves light utilization efficiency simultaneously and improves display brightness.
The present invention is achieved by the following technical programs:
A kind of reflective liquid crystal projecting apparatus contains lighting source, optical splitter/combiner spare, monolithic reflection type liquid crystal panel and projecting lens and constitutes projecting light path's structure, wherein:
(1) this optical splitter/combiner spare is made up of four PBS and four 1/2nd wave plates, these four adjacent layouts of PBS, and the whole formation of the polarization light-dividing surface of these four PBS is forked.
(2) four 1/2nd wave plates are separately positioned between per two PBS.
(3) lighting source, optical splitter/combiner spare and the concentricity line of projecting lens three are placed in proper order, and described monolithic reflection type liquid crystal panel is positioned at a side of optical splitter/combiner spare, is used for receiving the polarized light from the PBS outgoing.
On the said structure basis, further:
The vertical polarized light that receives two close with it PBS outgoing of monolithic reflection type liquid crystal panel.
Described PBS is the cube polarization splitting prism, and these four PBS entire combination become the square shape.
Described four PBS and four 1/2nd wave plates glue together the formation one each other.
Perhaps, described PBS is the tabular polarizing beam splitter, and the angle between the polarization light-dividing surface of each 1/2nd wave plate and adjacent PBS is 45 °.
Described monolithic reflection type liquid crystal panel is LCOS.
Another kind of technical scheme of the present invention is:
A kind of reflective liquid crystal projecting apparatus contains lighting source, optical splitter/combiner spare, two reflection type liquid crystal panels and projecting lens and constitutes projecting light path's structure, wherein:
(1) this optical splitter/combiner spare is made up of four PBS and four 1/2nd wave plates, these four adjacent layouts of PBS, and the whole formation of the polarization light-dividing surface of these four PBS is forked.
(2) four 1/2nd wave plates are separately positioned between per two PBS.
(3) lighting source, optical splitter/combiner spare and the concentricity line of projecting lens three are placed in proper order, and described two reflection type liquid crystal panels lay respectively at two relative sides of optical splitter/combiner spare, are used for receiving the polarized light from the PBS outgoing.
On the said structure basis, further:
Each sheet reflection type liquid crystal panel all vertically receives the polarized light of two close with it PBS outgoing.
Described PBS is the cube polarization splitting prism, and these four PBS entire combination become the square shape.
Described four PBS and four 1/2nd wave plates glue together the formation one each other.
Perhaps, described PBS is the tabular polarizing beam splitter, and the angle between the polarization light-dividing surface of each 1/2nd wave plate and adjacent PBS is 45 °.
Described two reflection type liquid crystal panels are LCOS.
Compared to prior art, the present invention has following beneficial effect:
Lighting source, optical splitter/combiner spare, the concentricity line of projecting lens three are arranged to linear structure, the LCOS liquid crystal panel is positioned at the side of optical splitter/combiner spare, and be parallel to this center line and place, adopt this optical projection system can obtain the reflective liquid crystal projecting apparatus that entity is a fine strip shape.
Two-piece type reflective liquid crystal projecting apparatus provided by the invention, still be designed to linear structure, two LCOS liquid crystal panels lay respectively at the both sides of optical splitter/combiner spare, opposing parallel, can fully receive, adopt this optical projection system to make and obtain the reflective liquid crystal projecting apparatus that display brightness is better, volume is elongated from the polarized light of each PBS outgoing.
In addition, if the PBS that adopts is the cube polarization splitting prism, then described four PBS and four 1/2nd wave plates can be glued together the formation one each other, compact conformation is easy to assembling.If the PBS that adopts is the tabular polarizing beam splitter, then can reduce cost.
Description of drawings
Fig. 1 is a single-chip reflective liquid crystal projection system synoptic diagram in the background technology.
Fig. 2 is a twin-core sheet reflective liquid crystal projection system synoptic diagram in the background technology.
Fig. 3 is the reflective liquid crystal projection system synoptic diagram that adopts twin-core sheet, four PBS in the background technology.
Fig. 4 adopts the reflective liquid crystal projecting apparatus system schematic of single display chip for the present invention.
Fig. 5 is the synoptic diagram of tabular polarizing beam splitter for PBS in the single-chip reflective liquid crystal projecting apparatus of the present invention.
Fig. 6 is a projection optics of the present invention path synoptic diagram.
Fig. 7 adopts the reflective liquid crystal projecting apparatus system schematic of two display chips for the present invention.
Embodiment
The present invention is further illustrated below in conjunction with the drawings and specific embodiments.
Please refer to Fig. 4, single-chip reflective liquid crystal projecting apparatus provided by the invention is made up of lighting source 1, optical splitter/combiner spare, reflection type liquid crystal panel 3 (the preferred LCOS of display chip), projecting lens 4.Lighting source 1 can be various types of light sources, is chosen as LED or LASER Light Source preferably, and lighting source 1 itself contains optically focused shaping device, does not do signal in detail in the accompanying drawings.Described optical splitter/combiner spare also can be referred to as the polarization conversion light-splitting device in the present invention, polarizing beam splitter PBS commonly used is generally the cubic polarization splitting prism, it constitutes by two triangular prisms are glued together, cemented surface is polarization light-dividing surface, be coated with the polarization spectro rete above, nonpolarized light is converted to polarized light after injecting this polarization light-dividing surface, be separated into orthogonal two bundle polarization state light simultaneously: P polarized light and S polarized light, angle at 45 between the polarization light-dividing surface of this cube PBS and the surface.In addition, also having a kind of PBS is the tabular polarizing beam splitter, and the low institute of this PBS cost takes up space little, and 45 ° of these PBS of incident of light beam can isolate P polarized light and S polarized light.
Described optical splitter/combiner spare is made up of four PBS and four 1/2nd wave plates, PBS is preferably cube PBS prism, these four adjacent layouts of PBS, and the whole formation of the polarization light-dividing surface of these four PBS is forked, as shown in Figure 4, PBS 21,22,23,24 entire combination become the square shape, and four 1/2nd wave plates 5 are folded in respectively between per two PBS, the whole formation of these four/2nd wave plates crosswise.The effect of described 1/2nd wave plates 5 is that a kind of polarization state polarized light is converted to another kind of polarization state polarized light, and for example the P polarized light with incident is converted to the outgoing of S polarized light.
Projecting light path's structure of this reflective liquid crystal projecting apparatus is: lighting source 1, optical splitter/combiner spare and the concentricity line of projecting lens 4 threes are placed (along direction of beam propagation) in proper order, described monolithic reflection type liquid crystal panel 3 is positioned at a side of optical splitter/combiner spare, be used for receiving polarized light from the PBS outgoing, obviously, reflection type liquid crystal panel 3 must be parallel to described center line to be placed, and will guarantee the vertical polarized light that receives two close with it PBS 21,22 outgoing.
Can obtain the reflective liquid crystal projecting apparatus of linear structure like this, can microminiaturization be made into fine strip shape.Compare with two LCOS, the optical projection system of four PBS of tool linear structure in the prior art shown in Figure 3 again, width dimensions with projecting lens 4 is reference, the width dimensions of liquid crystal projection apparatus of the present invention is corresponding with the width dimensions of a projecting lens 4, and the width dimensions of the projection arrangement of the prior art is corresponding with the twice of projecting lens 4 width dimensions, obviously when microminiaturization was made, the width dimensions of liquid crystal projection apparatus of the present invention had dwindled a lot.
The design of Optical System of one chip reflective liquid crystal projecting apparatus of the present invention has been broken traditional thinking, has novelty, because at present only adopting single-slice transmission type LCD liquid crystal panel just can be designed to linear structure in as the optical projection system of imager chip.
In the actual fabrication process, 21,22,23,24 and four 1/2nd wave plates 5 of described four PBS can be glued together each other the formation one, the optical splitter/combiner spare compact overall structure of Xing Chenging is easy to assembling like this.
The PBS that the present invention adopts can be the tabular polarizing beam splitter, can significantly reduce cost like this, as shown in Figure 5, four PBS 21,22,23,24 are the tabular polarizing beam splitter, four 1/2nd wave plates 5 are folded in therebetween, what need to guarantee is that angle between the polarization light-dividing surface of each 1/2nd wave plate 5 and adjacent PBS is 45 °, vertically inject 1/2nd wave plates with the assurance light beam after, the emergent light 45 is injected the polarization light-dividing surface of PBS.In addition, these four PBS also can mix and contain cubic PBS prism and tabular PBS, can arrange in pairs or groups arbitrarily, as long as help optical system, help Assembling Production.
Below be described in detail the optical path (image-forming principle) of optical projection system of the present invention:
Please refer to Fig. 6, lighting source 1 output light can be divided into the first half light beam L and the latter half light beam Shu, the first half light beam L is divided into P polarized light and the outgoing of S polarized light after injecting a PBS 21, the P polarized light is converted to the S polarized light through 1/2nd wave plates and injects the 2nd PBS 22, entered LCOS liquid crystal panel 3 by the reflection of the polarization light-dividing surface of the 2nd PBS 22, outgoing after this LCOS liquid crystal panel 3 is converted to the S polarized light of incident the P polarized light and gives image information, this P polarization image transmittance is converted to S polarization image light by one 1/2nd wave plate after crossing the 2nd PBS 22 again, inject the 3rd PBS23 then, by the polarization light-dividing surface of the 3rd PBS 23 reflection output, this S polarization image light enters projecting lens 4 outputs at last.Inject the 4th PBS 24 and be converted to the P polarized light from the S polarized light that a PBS 21 tells behind 1/2nd wave plates, directly transmission is gone out.
The latter half light beam Shu is divided into p polarized light and the outgoing of s polarized light after injecting the 4th PBS 24, the s polarized light converts the p polarized light to through 1/2nd wave plates and injects a PBS 21, transmission is crossed a PBS 21 and is entered LCOS liquid crystal panel 3, outgoing after this LCOS liquid crystal panel 3 is converted to the p polarized light of incident the s polarized light and gives image information, this s polarization image light enters a PBS 21 once more, reflected by its polarization light-dividing surface, be converted to p polarization image light through one 1/2nd wave plate then and inject the 2nd PBS 22, this p polarization image transmittance the 2nd PBS 22 outputs enter projecting lens 4 outputs at last.Inject the 3rd PBS 23 and behind 1/2nd wave plates, be converted to the s polarized light, reflected away by the polarization light-dividing surface of the 3rd PBS 23 then from the p polarized light that the 4th PBS 24 tells.
According to the light path imaging principle of above monolithic reflective liquid crystal projecting apparatus, the 4th PBS in this optical splitter/combiner spare and the 3rd PBS last the P polarized light and the s polarized light of output respectively are not utilized, and can lose.If place a slice LCOS liquid crystal panel 3 ' (relative with LCOS liquid crystal panel 3) again in this side of this optical splitter/combiner spare, this can be used to receive this part P polarized light and the s polarized light is used.
Specifically see shown in Figure 7, be two-piece type reflective liquid crystal projecting apparatus provided by the invention, two relative sides at optical splitter/combiner spare are provided with LCOS liquid crystal panel 3 and 3 ', the LCOS liquid crystal panel 3 vertical polarized lights that receive from a PBS 21 and the 2nd PBS 22 outgoing, LCOS liquid crystal panel 3 ' the vertical polarized light that receives from the 4th PBS 24 and the 3rd PBS 23 outgoing, modulate the image polarized light respectively,, enter projecting lens 4 at last from the outgoing of optical splitter/combiner spare.The front has been described the imaging optical path of LCOS liquid crystal panel 3 in detail, the imaging optical path of LCOS liquid crystal panel 3 ' similarly, those skilled in the art should be able to extrapolate, so do not give unnecessary details at this.
These two reflective liquid crystal projecting apparatus are on the basis of monolithic reflection type liquid crystal device of the present invention, and symmetry increases a slice reflection type liquid crystal panel, in order to improve light utilization efficiency, improve Projection Display brightness.And other parts comprise the identical of the structure embodiment of lighting source, optical splitter/combiner spare, projecting lens and this monolithic reflective liquid crystal projecting apparatus, and the descriptions thereof are omitted at this.
This reflective liquid crystal projecting apparatus is designed to linear structure equally, two LCOS liquid crystal panels 3 and 3 ' lay respectively at the both sides of optical splitter/combiner spare, opposing parallel, fully receive polarized light, adopt the projection arrangement of this structure to be made into the elongated entity of volume by microminiaturization from each PBS outgoing.
In addition, the reflective liquid crystal projecting apparatus of two-piece type is because output P polarization image light and S polarization image light if two liquid crystal panels are driven by the picture signal from different visual angles, then can be realized stereo display, and spectators put on polarising glass can see stereo-picture.
Claims (14)
1. a reflective liquid crystal projecting apparatus contains lighting source, optical splitter/combiner spare, monolithic reflection type liquid crystal panel and projecting lens and constitutes projecting light path's structure, it is characterized in that:
(1) this optical splitter/combiner spare is made up of four PBS and four 1/2nd wave plates, these four adjacent layouts of PBS, and the whole formation of the polarization light-dividing surface of these four PBS is forked.
(2) four 1/2nd wave plates are separately positioned between per two PBS.
(3) lighting source, optical splitter/combiner spare and the concentricity line of projecting lens three are placed in proper order, and described monolithic reflection type liquid crystal panel is positioned at a side of optical splitter/combiner spare, is used for receiving the polarized light from the PBS outgoing.
2. a kind of reflective liquid crystal projecting apparatus according to claim 1 is characterized in that: the vertical polarized light that receives two close with it PBS outgoing of monolithic reflection type liquid crystal panel.
3. a kind of reflective liquid crystal projecting apparatus according to claim 1 is characterized in that: described PBS is the cube polarization splitting prism, and these four PBS entire combination become the square shape.
4. a kind of reflective liquid crystal projecting apparatus according to claim 3 is characterized in that: described four PBS and four 1/2nd wave plates glue together the formation one each other.
5. a kind of reflective liquid crystal projecting apparatus according to claim 1 is characterized in that: described PBS is the tabular polarizing beam splitter.
6. a kind of reflective liquid crystal projecting apparatus according to claim 5 is characterized in that: the angle between the polarization light-dividing surface of each 1/2nd wave plate and adjacent PBS is 45 °.
7. a kind of reflective liquid crystal projecting apparatus according to claim 1 and 2 is characterized in that: described monolithic reflection type liquid crystal panel is LCOS.
8. reflective liquid crystal projecting apparatus contains lighting source, optical splitter/combiner spare, two reflection type liquid crystal panels and projecting lens and constitutes projecting light path's structure, it is characterized in that:
(1) this optical splitter/combiner spare is made up of four PBS and four 1/2nd wave plates, these four adjacent layouts of PBS, and the whole formation of the polarization light-dividing surface of these four PBS is forked.
(2) four 1/2nd wave plates are separately positioned between per two PBS.
(3) lighting source, optical splitter/combiner spare and the concentricity line of projecting lens three are placed in proper order, and described two reflection type liquid crystal panels lay respectively at two relative sides of optical splitter/combiner spare, are used for receiving the polarized light from the PBS outgoing.
9. a kind of reflective liquid crystal projecting apparatus according to claim 8 is characterized in that: each sheet reflection type liquid crystal panel all vertically receives the polarized light of two close with it PBS outgoing.
10. a kind of reflective liquid crystal projecting apparatus according to claim 8 is characterized in that: described PBS is the cube polarization splitting prism, and these four PBS entire combination become the square shape.
11. a kind of reflective liquid crystal projecting apparatus according to claim 10 is characterized in that: described four PBS and four 1/2nd wave plates glue together the formation one each other.
12. a kind of reflective liquid crystal projecting apparatus according to claim 8 is characterized in that: described PBS is the tabular polarizing beam splitter.
13. a kind of reflective liquid crystal projecting apparatus according to claim 12 is characterized in that: the angle between the polarization light-dividing surface of each 1/2nd wave plate and adjacent PBS is 45 °.
14. according to Claim 8 or 9 described a kind of reflective liquid crystal projecting apparatus, it is characterized in that: described two reflection type liquid crystal panels are LCOS.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008100655915A CN101539669B (en) | 2008-03-17 | 2008-03-17 | Reflective liquid crystal projecting apparatus |
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| CN2008100655915A CN101539669B (en) | 2008-03-17 | 2008-03-17 | Reflective liquid crystal projecting apparatus |
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| CN101539669B CN101539669B (en) | 2012-02-22 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104460209A (en) * | 2014-12-31 | 2015-03-25 | 深圳珑璟光电技术有限公司 | Display light machine structure and LCOS display illumination method of display light machine structure |
| CN107797276A (en) * | 2016-08-30 | 2018-03-13 | 北京亮亮视野科技有限公司 | It is a kind of that there is projection and the visually optical system of function |
| US11193193B2 (en) | 2016-12-08 | 2021-12-07 | Aleris Rolled Products Germany Gmbh | Method of manufacturing a wear-resistant aluminium alloy plate product |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1162733C (en) * | 1999-04-21 | 2004-08-18 | 3M创新有限公司 | Optical system sfor reflective LCD's |
| CN1203348C (en) * | 2003-06-24 | 2005-05-25 | 清华大学 | Reflection type liquid crystal stereographic optical projector |
-
2008
- 2008-03-17 CN CN2008100655915A patent/CN101539669B/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104460209A (en) * | 2014-12-31 | 2015-03-25 | 深圳珑璟光电技术有限公司 | Display light machine structure and LCOS display illumination method of display light machine structure |
| CN107797276A (en) * | 2016-08-30 | 2018-03-13 | 北京亮亮视野科技有限公司 | It is a kind of that there is projection and the visually optical system of function |
| US11193193B2 (en) | 2016-12-08 | 2021-12-07 | Aleris Rolled Products Germany Gmbh | Method of manufacturing a wear-resistant aluminium alloy plate product |
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| CN101539669B (en) | 2012-02-22 |
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