CN2463853Y - Colour beam splitting system for liquid crystal projector - Google Patents
Colour beam splitting system for liquid crystal projector Download PDFInfo
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- CN2463853Y CN2463853Y CN 01204252 CN01204252U CN2463853Y CN 2463853 Y CN2463853 Y CN 2463853Y CN 01204252 CN01204252 CN 01204252 CN 01204252 U CN01204252 U CN 01204252U CN 2463853 Y CN2463853 Y CN 2463853Y
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- liquid crystal
- beam splitting
- light
- splitting system
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Abstract
The utility model relates to a color beam splitting system of a liquid crystal projector, which comprises a plurality of polarizing filters, a plurality of polarizing beam splitting mirrors and three sets of liquid crystal panels, wherein, the polarizing beam splitting mirrors are arranged on the light path positions of the polarizing filters, and each polarizing beam splitting mirror comprises a pair of beam splitting prisms; the liquid-crystal panels are used for reflecting three polarizing beams with different colors to change the polarizing states of the polarizing beams. The color beam splitting system of a liquid crystal projector is characterized in that the incident face of at least one of the three sets of liquid-crystal panels is provided with a filter. The variegated light of beams is absorbed or reflected by the filter arranged in front of the liquid-crystal panels so that the utility model keeps the purity of the incident color of each liquid-crystal panel and enhances the color purity and the contrast effect of an image outputted by the color beam splitting system.
Description
The utility model is a kind of about the liquid crystal projector beam splitting system, is meant a kind of beam splitting system with specific optical filtering design with the minimizing heterochromatic light especially.
Liquid crystal projector is a product that widely is in fashion, and its main optical facilities have comprised so-called optics beam splitting system.For reflecting liquid crystal projector, its beam splitting system is formed with optical elements such as so-called polar biased spectroscope [PBS (Polarization Beam Splitter)] and reflection type liquid crystal [LCOS (Liquid Crystal On Silicon)] panels, cooperate again with light path design from axle (off-axis) or coaxial (on-axis), though adopt coaxial light path design to help design and make, its shortcoming then is to be difficult for reaching the effect of degree of contrast.
Fig. 1 is in order to the drawing in side sectional elevation of existing beam splitting system light path principle to be described, this light path system is formed with the reflective nematic liquid crystal panel of 4 groups of polar biased polariscopes and Red, and adopts coaxial light path design.As shown in Figure 1, this beam splitting system 10 comprise 4 groups of polar biased spectroscopes 11,12,13, with 14,4 groups of polar biased light filters (polarizerfilter) 15,16,17, with 18, one green reflection type liquid crystal panel 20, one blue reflection type liquid crystal panel 21, a red reflex formula liquid crystal panel 22 and a polar biased device 19.Wherein, each polar biased spectroscope comprises two colour splitting prisms all respectively, that is, polar biased spectroscope 11 comprise colour splitting prism 111 and 112, polar biased spectroscope 12 comprise colour splitting prism 121 and 122, polar biased spectroscope 13 comprise colour splitting prism 131 and 132 and 14 in polar biased spectroscope comprise colour splitting prism 141 and 142.
The light source 1 of beam splitting system 10 can produce a polar biased light beam 2 that is in S polar biased attitude, polar biased light beam 2 in beam splitting system 10, be subjected to three looks liquid crystal panel 20,21, with 22 reflection, this three liquid crystal panel then accepts to wait to throw the signal of image, so the light beam that leaves beam splitting system promptly projects image to be throwed according to this.
Polar biased light filter 15,16,17, with the 18 polar biased light beams that can filter specific color, wherein, polar biased light filter 15 and 18 can make redness and the blue light beam polar biased state by therebetween constant, and make the green beam polar biased state by therebetween convert the P attitude to from the S attitude, polar biased light filter 16 and 17 then can make the blue light beam polar biased state by therebetween constant, and makes the red beam polar biased state by therebetween convert the P attitude to from the S attitude.
As shown in Figure 1, when polar biased light beam 2 arrived at the interface of colour splitting prism 111 and 112, the red blue light components 2a that is in the S attitude can be reflected and advance towards polar biased light filter 16, and the green component 2b that is in the P attitude is transmission colour splitting prism 112 and enter polar biased spectroscope 12 then.
Green component 2b is by the interface of colour splitting prism 121 and 122, now also is subjected to the reflection of green liquid crystal panel 20 and is converted to the blue beam 3b of S attitude by the P attitude, blue beam 3b continues to enter polar biased spectroscope 14, and be subjected to colour splitting prism 141 and 142 interface reflection and continue by polar biased light filter 18, so can convert the P attitude to by the S attitude by blue beam 3b therebetween, the last polar biased device 19 that also passes through the P attitude, thereby form the green component 4b that throws image.
In like manner, the polar biased light filter 16 blue beam 21a that red blue light components 2a by therebetween can be divided into keep S polar biased attitude, with the red beam 21b that converts the P attitude from the S attitude to.Wherein, red beam 21b passes the interface of colour splitting prism 131 and 132, and be subjected to the reflection of red liquid crystal panel 22 and transfer the red beam 22b of S attitude to, and now is by polar biased light filter 17, so will convert the P attitude to by the S attitude by red beam 22b therebetween, and now transmit polar biased spectroscope 14, polar biased light filter 18, with polar biased device 19, thereby become the red light component 23b of projection image.
In addition, blue beam 21a then is subjected to the reflection of colour splitting prism 131 and 132 interfaces and blue liquid crystal panel 21 respectively, thereby convert a P attitude blue beam 22a who enters polar biased spectroscope 14 to, now and transmission polar biased light filter 17, colour splitting prism 141 and 142, polar biased light filter 18, and polar biased device 19, thereby become the blue light components 23a of projection image.
So far, with above red bluish-green three gangs of light component 23b, 23a that are in the P attitude, with 4b superimposed the projection image of LCD projector for this reason.
Yet in fact, form the spectroscopical colour splitting prism of polar biased often because its surface coating do not attain ideal, make that its contrast (extinction ratio) is relatively low, that is, the P attitude light beam transmissivity of the interface institute transmission of spectroscopical two colour splitting prisms of polar biased and the ratio of S attitude light beam transmissivity are too small, that is to say, the red blue light components of S attitude that still is mingled with small part such as the P attitude green component 2b of the interface institute transmission of colour splitting prism 111 and 112, these parasitic lights are again through the polarization and the reflection of green liquid crystal panel 20, cause the red blue light components that also is mingled with part in order to the green component 4b of imaging at last, thereby the contrast effect of influence projection image.In like manner, the red blue light components 2a of S attitude also is mingled with the P attitude green component of small part, pass through the reflection of blue liquid crystal panel 21 or red liquid crystal panel 22 more respectively, a last part that also becomes the blue light components 23a or the red light component 23b of output, thereby the colour purity and the contrast effect of influence projection image.
In like manner, be similar to above-mentioned reflecting liquid crystal projector, the penetration liquid crystal projector also has similar heterochromatic light problem, so therefore the colour purity of its projection image and contrast effect also are greatly affected.
Fundamental purpose of the present utility model provides a kind of beam splitting system with liquid crystal projector of preferable contrast effect, this beam splitting system accept liquid crystal projector light source, with wait to throw the signal of image, and export an image to be throwed.
The purpose of this utility model can reach by following measure:
A kind of beam splitting system of liquid crystal projector, this beam splitting system accept from this liquid crystal projector light source light beam, with wait to throw the signal of image, and export an image to be throwed, this beam splitting system comprises:
A plurality of polar biased light filters (Polarizer filter) are in order to the polarization state of conversion specific color light beam;
A plurality of polar biased spectroscopes [PBS (Polarization Beam Splitter)], be disposed on the light path position at this polar biased light filter place, each polar biased spectroscope all comprises a pair of colour splitting prism, in order to will be incident to the respectively polarization light beam beam split in addition of the spectroscopical various colors of this polar biased; And
3 groups of liquid crystal panels respectively in order to reflecting the polarization light beam of three kinds of aforementioned different colors, and change its polar biased state simultaneously;
In aforementioned 3 groups of liquid crystal panels, have at least the plane of incidence side of a liquid crystal panel to dispose a light filter, so that filter the color of the light beam that enters this liquid crystal panel.
A kind of beam splitting system of liquid crystal projector, this beam splitting system accept from this liquid crystal projector light source light beam, with wait to throw the signal of image, and export an image to be throwed,
This beam splitting system comprises:
A plurality of dichroics (dichroic) element is divided into the light beam of 3 strands of different colors in order to the light beam with light source;
A plurality of minute surfaces are respectively in order to reflect the light beam of this different color;
3 groups of liquid crystal panels are respectively in order to accept and the light beam of this dichroic element of transmission or aforementioned three kinds of different colors that minute surface reflected; And
One Amici prism group comprises a plurality of dichroic element, in order to reflection or the aforementioned light beam that transmits the various colors of this liquid crystal panel of transmission;
In the foregoing liquid crystal panel, have at least the plane of incidence side of a liquid crystal panel to dispose a light filter or polar biased light filter (polarizer filter), so that filter the color of the light beam that enters this liquid crystal panel.
The utility model has following advantage compared to existing technology:
This beam splitting system comprises: a plurality of polar biased light filters (Polarizer filter), in order to the polarization state of conversion specific color light beam; A plurality of polar biased spectroscopes (PolarizationBeam Splitter), be disposed on the light path position at polar biased light filter place, each polar biased spectroscope all comprises a pair of colour splitting prism, in order to the polarization light beam beam split in addition with the spectroscopical various colors of incident polar biased; And 3 groups of liquid crystal panels, respectively in order to reflecting the polarization light beam of three kinds of different colors, and change its polar biased state simultaneously; Wherein, this beam splitting system is characterised in that: in 3 groups of liquid crystal panels, have at least the plane of incidence place of a liquid crystal panel to dispose a light filter, so that filter the color of the light beam that enters liquid crystal panel.So, the light beam of each single color is if be mingled with the heterochromatic light of other color, by liquid crystal panel the time, can be configured liquid crystal panel light filter before absorbs or reflects, thereby can keep the colour purity of each liquid crystal panel of incident, also can greatly reduce the variegated light quantity of beam splitting system output beam, so can greatly promote the colour purity and the contrast effect of beam splitting system image output.
The utility model is described in further detail as follows below in conjunction with drawings and Examples:
Fig. 1 is in order to the drawing in side sectional elevation of existing beam splitting system light path principle to be described.
Fig. 2 is in order to the light path drawing in side sectional elevation of the beam splitting system in the reflecting liquid crystal projector to be described among first embodiment of the present utility model.
Fig. 3 is in order to the light path drawing in side sectional elevation of the beam splitting system of a transmission-type liquid crystal projector to be described among second embodiment provided by the utility model.
The figure number numbering
1～light source
2～polar biased light beam
3～white light source
2a～red blue light components
2b～green component
3b～blue beam
4b～green component
56～green component
10～beam splitting system
11,12,13,14～polar biased spectroscope
15,16,17,18～polar biased light filter
19～polar biased device
20,21,22,23～liquid crystal panel
21a～blue beam
21b～red beam
22a～blue beam
22b～red beam
23a～blue light components
23b～red light component
30～beam splitting system
31,32,33,34～polar biased spectroscope
35,36,37,38～polar biased light filter
39～polar biased device
40,41,42～liquid crystal panel
51,52～light filter
60～beam splitting system
61,62～dichroic element
71,72,73～catoptron
80,81,82～liquid crystal panel
83～red filter
84～green filter
85～blue filter
91,92,93,94～prism
111.112～colour splitting prism
121.122～colour splitting prism
131.132～colour splitting prism
141,142～colour splitting prism
311.312～colour splitting prism
321,322～colour splitting prism
331,332～colour splitting prism
341,342～colour splitting prism
Fig. 2 is in order to the light path drawing in side sectional elevation of the beam splitting system in the reflecting liquid crystal projector to be described among first embodiment of the present utility model.Fig. 3 is in order to the light path drawing in side sectional elevation of the beam splitting system of a transmission-type liquid crystal projector to be described among second embodiment provided by the utility model.As shown in Figure 2, according to first embodiment provided by the utility model, the beam splitting system 30 of one reflecting liquid crystal projector also is similar to beam splitting system shown in Figure 1 10, include 4 groups of polar biased spectroscopes 31,32,33, with 34,4 groups of polar biased light filters 35,36,37, with 38, one green reflection type liquid crystal panel 40, one blue reflection type liquid crystal panel 41, a red reflex formula liquid crystal panel 42 and a polar biased device 39.Wherein, above-mentioned each liquid crystal panel all is a reflective twisted nematic liquid crystal panel (Twisted Nematic LCD panel), each polar biased spectroscope comprises two colour splitting prisms all respectively, that is, polar biased spectroscope 31 comprise colour splitting prism 311 and 312, polar biased spectroscope 32 comprise colour splitting prism 321 and 322, polar biased spectroscope 33 comprise colour splitting prism 331 and 332 and 14 in polar biased spectroscope comprise colour splitting prism 341 and 342.The design of other light path and the principle of operation of system are also as aforementioned technology contents in order to key diagram 1.
As shown in Figure 2, beam splitting system 30 is characterised in that: 3 groups of liquid crystal panels 40,41, respectively dispose light filter 50,51 with 42 the face of penetrating place, with 52, to filter the color of the light beam that enters each liquid crystal panel respectively.Light filter 50,51, with 52 can be an optical filter respectively or be coated on each liquid crystal face, have a plated film of filter effect, and, each light filter is all the absorptive filters that can absorb the specific color light beam, perhaps, also can be the reflective light filter of reflection specific color light beam.For example, the light filter 50 that is disposed at the beam incident surface place of green liquid crystal panel 40 is one can absorb the optical filter or the optical filtering plated film of red blue beam, also can be the optical filter or the optical filtering plated film of a reflect red blue beam; The rest may be inferred with 42 of red liquid crystal panels for blue liquid crystal panel 41.
Utilize above-mentioned each light filter that is disposed at each liquid crystal panel beam incident surface place, any intrafascicular heterochromatic light of certain particular color of light that is entrained in all can be absorbed or reflect by pairing light filter.For example, be entrained in red blue heterochromatic light among the green beam 4b before incident green liquid crystal panel 40, promptly can absorbed or reflect by light filter 50 earlier, so the degree that the variegated light quantity of red indigo plant among the green component 5b of last gained can be minimized.In like manner, light filter 51 also can filter the green red heterochromatic light of incident liquid crystal panel 41, and light filter 52 then can filter the bluish-green heterochromatic light of incident liquid crystal panel 42.Therefore, the output beam of all kinds of beam splitting system 30 last gained all has minimum heterochromatic light, so can greatly promote the colour purity and the contrast effect of projection image.
As shown in Figure 3, according to second embodiment provided by the utility model, the beam splitting system 60 of one penetration liquid crystal projector comprises: 2 groups of dichroics (dichroic) element 61 and 62,3 groups of catoptrons 71,72, with 73, one transmission-type red liquid crystal panel 80, a transmission-type green liquid crystal panel 81, with a transmission-type blue liquid crystal panel 82, one red filter 83, a green filter 84, with a blue filter 85, and comprise 4 component color prisms 91,92,93, with 94 prism combination.Wherein, above-mentioned each liquid crystal panel all is a transmission-type twisted nematic liquid crystal panel, each dichroic element then can be the prism that the light beam incidence surface is a dichroic mirror (dichroicmirror), each colour splitting prism then is the prism that a surface-coated has the dichroic plated film, so that can with incident wherein the polar biased light beam of different color reflected or transmission, the light path of each color is also as shown in Figure 2 in the beam splitting system 60.
Red filter 83 is one can absorb or reflect the optical filter or the plated film of green-blue light, and green filter 84 is one can absorb or the optical filter or the plated film of reflect red blue light, and 85 of blue filters are one can absorb or the optical filter or the plated film of reflect red green glow.
At first, the white light source 3 of incident beam splitting system 60 passes through the beam split of dichroic element 61 and is divided into ruddiness and two strands of light beams of green-blue light, and ruddiness is subjected to the reflection of catoptron 71 and continues directive liquid crystal panel 80; Green-blue light then is divided into green glow and two strands of light beams of blue light by dichroic element 62, blue beam now directive liquid crystal panel 81, blue light then passes through the reflection of catoptron 72 and 73 and directive liquid crystal panel 82, wherein, the polarization characteristic of each liquid crystal panel can make transmission light beam therebetween possess specific polar biased state, at last, three strands of light beams that transmit each liquid crystal panel are subjected to reflection and the transmission that Amici prism makes up respectively according to its deflection polarity with color, thereby merge into the output beam of beam splitting system 60.
Yet, because the immaturity of the material of dichroic element own, the effect of its beam split often also not exclusively, so, each color beam that arrives at each liquid crystal panel often also is mingled with the heterochromatic light of other color, cause the impure of each color beam that beam splitting system is exported, thereby greatly influence the colour purity and the contrast effect of image output.
Present embodiment is characterised in that: the beam incident surface place of each liquid crystal panel is provided with light filter 83,84 respectively, with 85, so, light beam by each liquid crystal panel is if contain heterochromatic light, for example, the still assorted turquoise heterochromatic light that a little is arranged of the red beam that dichroic element 61 is told, these heterochromatic lights are before its incident liquid crystal panel 80, promptly can be absorbed or reflect by light filter 83 earlier, thereby the purity that can greatly promote the red beam of injecting liquid crystal panel 80, in like manner, green filter 84 also possesses similar effects with blue filter 85.In addition, be to cooperate the actual design of projector's beam splitting system 60, more than each light filter 83,84, with 85 also can replace a polar biased light filter (polarizer filter) respectively.
So, by above each embodiment as can be known, the light filter of the emphasis of beam splitting system of the present utility model before being disposed at each reflective or transmissive liquid crystal panel, this light filter can fully filter logical
Cross each heterochromatic light therebetween, thus the colour purity of beam splitting system output beam can significantly be promoted,
Thereby greatly promote the colour purity and the contrast effect of projection image.
The description that more than utilizes embodiment and done is a content of the present utility model for convenience of description, but not with the utility model narrow sense be limited to this embodiment.Allly do not deviate from any change that spirit of the present utility model is done, all belong to the scope that the utility model is applied for a patent.
Claims (17)
1. the beam splitting system of a liquid crystal projector, this beam splitting system accept from this liquid crystal projector light source light beam, with wait to throw the signal of image, and export an image to be throwed, this beam splitting system comprises:
A most polar biased light filter;
A most polar biased spectroscope are disposed on the light path position at this polar biased light filter place, and each polar biased spectroscope all comprises a pair of colour splitting prism; And
3 groups of liquid crystal panels;
Wherein, this beam splitting system is characterised in that:
In aforementioned 3 groups of liquid crystal panels, have at least the plane of incidence side of a liquid crystal panel to dispose a light filter.
2. the beam splitting system of liquid crystal projector as claimed in claim 1, it is characterized in that: wherein, aforementioned light filter is one of reflective light filter and absorptive filters.
3. the beam splitting system of liquid crystal projector as claimed in claim 1 is characterized in that: wherein, aforementioned light filter is one to have the plated film of filter effect.
4. the beam splitting system of liquid crystal projector as claimed in claim 1, it is characterized in that: wherein, the emitted light beam of the light source of aforementioned beam splitting system is a S attitude polar biased light beam.
5. the beam splitting system of liquid crystal projector as claimed in claim 1, it is characterized in that: wherein, the output beam of aforementioned beam splitting system is a P attitude polar biased light beam.
6. the beam splitting system of liquid crystal projector as claimed in claim 1, it is characterized in that: wherein, this beam splitting system is that incident beam is divided into the light beam that 3 stocks are not represented 3 kinds of basic colors, and and then these 3 strands of light beams is incident to aforementioned 3 groups of liquid crystal panels.
7. the beam splitting system of liquid crystal projector as claimed in claim 1 is characterized in that: wherein, aforementioned each polar biased light filter is the combination of the sluggish device of a phase place.
8. the beam splitting system of liquid crystal projector as claimed in claim 1, it is characterized in that: wherein, aforementioned beam splitting system is provided with 4 groups of polar biased light filters altogether, 2 groups of polar biased states of changing a kind of color in aforementioned 3 kinds of basic colors wherein, other 2 groups of polar biased states of then changing the another kind of color in aforementioned 3 kinds of basic colors.
9. the beam splitting system of liquid crystal projector as claimed in claim 1, it is characterized in that: wherein, this liquid crystal panel is a reflective twisted nematic liquid crystal panel.
10. the beam splitting system of liquid crystal projector as claimed in claim 1, it is characterized in that: wherein, aforementioned beam splitting system more comprises is located at the last polar biased device of light path.
11. the beam splitting system of a liquid crystal projector, this beam splitting system accept from this liquid crystal projector light source light beam, with wait to throw the signal of image, and export an image to be throwed,
This beam splitting system comprises:
Most dichroic (dichroic) element;
A most minute surface;
3 groups of liquid crystal panels are respectively in order to accept and the light beam of this dichroic element of transmission or aforementioned three kinds of different colors that minute surface reflected; And
One Amici prism group comprises most dichroic element;
Wherein, this beam splitting system is characterised in that:
In the foregoing liquid crystal panel, have at least the plane of incidence side of a liquid crystal panel to dispose a light filter or polar biased light filter.
12. the beam splitting system of liquid crystal projector as claimed in claim 11, it is characterized in that: wherein, aforementioned light filter be reflective light filter and absorptive filters the two one of, and aforementioned polar biased light filter be reflective polar biased light filter and absorption polar biased light filter the two one of.
13. the beam splitting system of liquid crystal projector as claimed in claim 11 is characterized in that: wherein, aforementioned dichroic element is that a light beam incidence surface is the prism of a dichroic mirror.
14. the beam splitting system of liquid crystal projector as claimed in claim 11 is characterized in that: wherein, aforementioned Amici prism group includes 4 dichroic element.
15. the beam splitting system of liquid crystal projector as claimed in claim 14 is characterized in that: wherein, aforementioned each dichroic element is that a light beam incidence surface is the prism of a dichroic mirror,
16. the beam splitting system of liquid crystal projector as claimed in claim 11, it is characterized in that: wherein, aforementioned beam splitting system includes two groups of dichroic element, become 3 strands of light beams of respectively representing 3 kinds of basic colors in order to light beam split respectively, and and then these 3 strands of light beams are incident to aforementioned 3 groups of liquid crystal panels aforementioned light source.
17. the beam splitting system of liquid crystal projector as claimed in claim 11 is characterized in that: wherein, this liquid crystal panel is a transmission-type twisted nematic liquid crystal panel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01204252 CN2463853Y (en) | 2001-02-16 | 2001-02-16 | Colour beam splitting system for liquid crystal projector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01204252 CN2463853Y (en) | 2001-02-16 | 2001-02-16 | Colour beam splitting system for liquid crystal projector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2463853Y true CN2463853Y (en) | 2001-12-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01204252 Expired - Fee Related CN2463853Y (en) | 2001-02-16 | 2001-02-16 | Colour beam splitting system for liquid crystal projector |
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| Country | Link |
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| CN (1) | CN2463853Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100370310C (en) * | 2002-02-19 | 2008-02-20 | 株式会社日立制作所 | Projecting device and projecting image display devices |
| CN104570331A (en) * | 2015-01-31 | 2015-04-29 | 哈尔滨工业大学 | Method for improving resolution of DMD (digital micro-mirror device) by means of optical assembling |
-
2001
- 2001-02-16 CN CN 01204252 patent/CN2463853Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100370310C (en) * | 2002-02-19 | 2008-02-20 | 株式会社日立制作所 | Projecting device and projecting image display devices |
| CN101201460B (en) * | 2002-02-19 | 2010-04-21 | 株式会社日立制作所 | Projection apparatus and projection-type image display apparatus |
| CN104570331A (en) * | 2015-01-31 | 2015-04-29 | 哈尔滨工业大学 | Method for improving resolution of DMD (digital micro-mirror device) by means of optical assembling |
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