CN1428628A - Polarization converter device for liquid crystal projection display and its preparation method - Google Patents
Polarization converter device for liquid crystal projection display and its preparation method Download PDFInfo
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- CN1428628A CN1428628A CN 01139205 CN01139205A CN1428628A CN 1428628 A CN1428628 A CN 1428628A CN 01139205 CN01139205 CN 01139205 CN 01139205 A CN01139205 A CN 01139205A CN 1428628 A CN1428628 A CN 1428628A
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- wiregrating
- metal film
- superfine metal
- light
- converter device
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- 230000010287 polarization Effects 0.000 title claims abstract description 47
- 239000004973 liquid crystal related substance Substances 0.000 title abstract description 6
- 238000002360 preparation method Methods 0.000 title abstract description 6
- 229910052751 metal Inorganic materials 0.000 claims description 25
- 239000002184 metal Substances 0.000 claims description 25
- 238000000034 method Methods 0.000 claims description 18
- 229920002120 photoresistant polymer Polymers 0.000 claims description 5
- 239000013078 crystal Substances 0.000 claims description 4
- 238000005530 etching Methods 0.000 claims description 2
- 239000000758 substrate Substances 0.000 claims description 2
- 238000010521 absorption reaction Methods 0.000 claims 1
- 238000006243 chemical reaction Methods 0.000 abstract description 9
- 240000007594 Oryza sativa Species 0.000 abstract 1
- 235000007164 Oryza sativa Nutrition 0.000 abstract 1
- 235000009566 rice Nutrition 0.000 abstract 1
- 239000010408 film Substances 0.000 description 25
- 238000010586 diagram Methods 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 230000005288 electromagnetic effect Effects 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 2
- 239000004411 aluminium Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000005357 flat glass Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000002310 reflectometry Methods 0.000 description 2
- 229910052703 rhodium Inorganic materials 0.000 description 2
- 239000010948 rhodium Substances 0.000 description 2
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008033 biological extinction Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 230000001795 light effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 238000007738 vacuum evaporation Methods 0.000 description 1
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Abstract
The present invention provides a polarization conversion device for liquid crystal projection display and its preparation method. It uses ultrafine melal film rice grid as polarizing device, and can produce polarization action for visible light wave band, after it is matched with wave plate and light source reflector and used, it can possess polarization conversion action.
Description
The present invention relates to optical field, particularly a kind of crystal projection shows the polarization converter device of usefulness.
In recent years, the technical development of high-definition television (HDTV) is very fast, development has played many novel display techniques, as: Plasma Display (PDP) technology, thin film transistor (TFT) (TFT) display technique, digital micro-mirror show (DMD) technology and silicon base liquid crystal reflective (LCOS) display technique or the like.Wherein, TFT and LCOS display technique all belong to lcd technology, owing to have advantages such as resolution height, cost are low, easy realization of large-scale production, are considered to follow-on main flow display technique.
Lcd technology all utilizes the polarisation of light effect to realize basically.But the light that real-life light source sent all is the natural light of not being with polarization basically.Therefore, the polarizer is the vitals in the liquid crystal display systems.Traditional folk prescription method that rises is to adopt polarizing prism or polar organic molecular material, the shortcoming of this method is to utilize the light of a certain polarization direction, the light of other polarization direction then has been wasted, so it also can not surpass 50% to the utilization ratio of light source is the highest.And in liquid crystal display systems, the utilization ratio of light source is an important factors.At this, development in recent years has gone out a plurality of little polarization splitting prisms of a kind of usefulness and 1/2nd wave plates glue together the polarization converter device that combines, and can convert natural light to linearly polarized light.But the cost of this polarization converter device is higher, and owing to reasons such as cemented surface are a lot of, actual optical efficiency also can only reach about 70%.
The object of the present invention is to provide a kind of simple in structure, with low cost, light conversion efficiency is high, extinction ratio is high, reliability and the good polarization converter device of anti-solidity.
Method of the present invention is to plate broad-band transparence-increased film, metallic reflective coating (as aluminium, silver, rhodium film etc.) and medium in the one flat plate method with vacuum evaporation on glass earlier to increase anti-film, be coated with photoresist more thereon, place it in then in the interference stria image that forms by two bundle laser beam interferences and expose, after photographic fixing, form the photoresist striped that solidifies, with lithographic method the reflectance coating of striped opening portion is removed, again remaining photoresist is washed off, formed the reflectance coating pattern of superfine metal film wiregrating.When cycle of this superfine metal film wiregrating less than two of optical wavelength/for the moment, because the electromagnetic effect of light, have only the polarized light component vertical with this wiregrating direction unhinderedly to see through this wiregrating, the polarized light component parallel with this wiregrating direction then is reflected back.
Last all plate anti-reflection film at the another side of this superfine metal film wiregrating substrate again, and fit together, promptly constitute polarization converter device of the present invention with phase place wave plate that another sheet is coated with anti-reflection film.When the illumination of sending when light source is mapped to this device, the light of a polarization direction unhinderedly sees through this device, then gone back with the light of another polarization direction of this polarization direction quadrature by wire grid reflects, behind 1/4th phase place wave plates, its 45 ° of polarization direction rotation also projects on the light source reflector, after the source reflection mirror reflection, this part light is once more through 1/4th phase place wave plates, its polarization direction rotates 45 ° once more and becomes vertical with the wiregrating direction, thereby can see through this wiregrating, so then realize the polarization conversion function effectively.
Description of drawings of the present invention is as follows:
Fig. 1 is existing polarization converter device synoptic diagram.
Fig. 2 is the cross section structure synoptic diagram of superfine metal film wiregrating.
Fig. 3 is a kind of method synoptic diagram of preparation superfine metal film wiregrating.
Fig. 4 is the application synoptic diagram of polarization converter device of the present invention.
Below in conjunction with accompanying drawing the present invention is elaborated.But do not limit content of the present invention.
Fig. 1 is the synoptic diagram of the present polarization converter device of using always.It is to be formed by a plurality of polarization splitting prism 1 gummeds, is coated with polarization beam splitter 2 and highly reflecting films 3 on the light splitting surface of each polarization splitting prism respectively, posts 1/2nd wave plates 4 in addition on the exiting surface of each alternate polarization splitting prism respectively.When incident ray 5 incided this polarization converter device, the light of a part of polarization direction (s polarized light) penetrated after the reflection of highly reflecting films 3 after being polarized spectro-film 2 reflections again, still keeps s direction polarization (light 7).The light of another part polarization direction (p polarized light) then sees through polarization beam splitter 2, penetrates being become s direction polarized light 6 by 1/2nd wave plates 4 after with its polarization direction half-twist on the exiting surface then, thereby has realized the polarization conversion of natural light.This polarization converter device need cooperate the cylindrical lens array group to use, and conversion efficiency in theory is very high, but in actual applications, owing to factors such as cemented surface are a lot of, actual conversion efficiency can only reach about 70%.And it is very difficult that it is made, thereby cost of manufacture is also very high.
Fig. 2 then is the cross section structure synoptic diagram of the used superfine metal film of the present invention wiregrating device 12.Its basic structure is coated with high-reflectivity metal film (aluminium, silver or rhodium etc.) and exactly through being etched into ultra-fine wiregrating 9 on one flat plate glass 8.The live width of metal film wiregrating is t
1, wiregrating be spaced apart t
2, the period T=t of wiregrating then
1+ t
2When the period T of wiregrating less than the (T＜λ of two of lambda1-wavelength/for the moment
0/ 2), because the electromagnetic effect of light, then only can see through this device perpendicular to the polarized light of wiregrating, the polarized light that is parallel to wiregrating then is reflected back, or is absorbed.Because this polarization phenomena that to be the electromagnetic effect of light cause, so its degree of polarization can reach very high.Can on the wiregrating metal film, be coated with medium again and increase anti-film 10, can improve reflectivity, absorb thereby reduce for the polarized light that is parallel to wiregrating.Similarly, all plate broad-band transparence-increased film 11, can further improve transmitance perpendicular to the polarized light of wiregrating on the two sides of sheet glass.
At visible light wave range, realize that partially the period T that requires wiregrating can't satisfy this requirement less than 0.2 micron with common wiregrating preparation method with above-mentioned superfine metal film wiregrating method.Fig. 3 is the synoptic diagram of a kind of method of the above-mentioned superfine metal film of preparation of the present invention wiregrating.The laser beam that the laser instrument 13 of ultraviolet or visible waveband is launched is divided into two-beam by a semi-transparent semi-reflecting spectroscope 14, wherein a branch of light passes a phase delayer 18 after the refraction of catoptron 16, again after the refraction by another catoptron 17, merge relevant at another semi-transparent semi-reflecting spectroscope 15 places and another Shu Guanghui, light beam after two bundles are relevant projects respectively on two samples 19 and 20 that scribble photoresist again and exposes, after development, photographic fixing and etching, just can make the wire grid construction that corresponds to interference fringe.Carve angle and thickness by what adjust phase delayer 18, or by changing the relative angle and the position of catoptron 16,17, the live width that can obtain requiring and at interval.
Fig. 4 is the application synoptic diagram of polarization converter device of the present invention.Above-mentioned superfine metal film wiregrating device 12 and 1/4th phase place wave plates 21 of a slice visible light wave range are combined, when the natural lighting of launching when light source 22 is mapped to this assembling device, have only the polarized light component vertical can see through this device with the wiregrating direction, the polarized light component parallel with the wiregrating direction then is reflected back, through 1/4th phase place wave plates 21 time, its polarization direction is rotated 45 °, this part light and then reflected by light source reflector 23, through 1/4th phase place wave plates 21 time, its polarization direction is rotated 45 ° once more, thereby become vertically, thereby also can see through this device with the wiregrating direction.Realized the function of polarization conversion with this this assembling device.
In fact, the wire grid construction of a sub-wavelength also can equivalence become a uniaxial negative crystal, therefore the suitable medium of adjusting in the above-mentioned superfine metal film wiregrating device increases the thickness and the refractive index of anti-film and broad-band transparence-increased film, can make its equivalence become one 1/4th phase place wave plate, thereby make a slice device just can play the function of polarization conversion.
The present invention has following beneficial effect:
1. adopt method of the present invention natural daylight can be converted expeditiously to high-polarization
Linearly polarized light.
2. adopt method of the present invention can reduce the production cost of polarization converter device greatly,
Help applying.
3. method of the present invention can be at LCD projecting system, wear-type liquid crystal indicator etc.
Be used widely in the multiple display system aspect of polarization effect that utilizes.
Claims (8)
1. a crystal projection shows the polarization converter device of usefulness, comprise parts such as superfine metal film wiregrating, phase place wave plate, light source and light source reflector, it is characterized in that using the combination of superfine metal film wiregrating and phase place wave plate, reach the purpose that the natural light that light source is sent converts linearly polarized light expeditiously to.
2. polarization converter device as claimed in claim 1, it is characterized in that using superfine metal film wiregrating as polarizing component, make polarized component vertical with this wiregrating direction in the natural light almost unhinderedly see through this superfine metal film wiregrating element, the polarized component parallel with this wiregrating direction then is reflected back.
3. polarization converter device as claimed in claim 1, it is characterized in that adopting the phase place wave plate, and make the polarized component parallel that is reflected back see through this wave plate twice with the wiregrating direction, and make 90 ° of its change of polarized direction, thereby the change of polarized direction of this linearly polarized light is become perpendicular to wiregrating, thereby can see through this superfine metal film wiregrating element.
4. the superfine metal film wiregrating element described in claim 2 is characterized in that its wiregrating width is between 0.02 micron～0.4 micron.
5. superfine metal film wiregrating element as claimed in claim 4 is characterized in that adopting being coated with the structure that multilayered medium increases anti-layer on the wire grating, can effectively reduce absorption loss, can effectively protect metal film simultaneously.
6. superfine metal film wiregrating element as claimed in claim 4 is characterized in that all being coated with the broad-band transparence-increased film of visible light wave range on its two surfaces, can improve through efficient.
7. as claim 5 and 6 described superfine metal film wiregrating elements, it is characterized in that its medium increases anti-film and can make its equivalence become a phase place wave plate with the ratio of broad-band transparence-increased intermembranous equivalent refractive index and the relation of phasic difference.
8. method for preparing superfine metal film wiregrating element as claimed in claim 4, it is characterized in that the stripe image after the laser beam interference of two bundle ultraviolets or visible waveband is projected the also photographic fixing that exposes on the substrate that scribbles photoresist, and then be made into superfine metal film wiregrating element with etching method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01139205 CN1428628A (en) | 2001-12-25 | 2001-12-25 | Polarization converter device for liquid crystal projection display and its preparation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01139205 CN1428628A (en) | 2001-12-25 | 2001-12-25 | Polarization converter device for liquid crystal projection display and its preparation method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1428628A true CN1428628A (en) | 2003-07-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 01139205 Pending CN1428628A (en) | 2001-12-25 | 2001-12-25 | Polarization converter device for liquid crystal projection display and its preparation method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101963719A (en) * | 2010-01-26 | 2011-02-02 | 李冠军 | Liquid crystal display and liquid crystal display device |
| CN101236305B (en) * | 2007-02-02 | 2011-06-01 | 上海飞锐光电科技有限公司 | Polarization converting device |
| US8013953B2 (en) | 2007-01-24 | 2011-09-06 | Hitachi, Ltd. | Polarizer and liquid crystal display device using same |
| CN104570462A (en) * | 2015-01-21 | 2015-04-29 | 昆山龙腾光电有限公司 | Liquid crystal display panel and production method thereof |
| CN113126296A (en) * | 2020-01-15 | 2021-07-16 | 未来（北京）黑科技有限公司 | Head-up display equipment capable of improving light utilization rate |
-
2001
- 2001-12-25 CN CN 01139205 patent/CN1428628A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8013953B2 (en) | 2007-01-24 | 2011-09-06 | Hitachi, Ltd. | Polarizer and liquid crystal display device using same |
| CN101236305B (en) * | 2007-02-02 | 2011-06-01 | 上海飞锐光电科技有限公司 | Polarization converting device |
| CN101963719A (en) * | 2010-01-26 | 2011-02-02 | 李冠军 | Liquid crystal display and liquid crystal display device |
| CN101963719B (en) * | 2010-01-26 | 2012-04-04 | 李冠军 | Liquid crystal display and liquid crystal display device |
| CN104570462A (en) * | 2015-01-21 | 2015-04-29 | 昆山龙腾光电有限公司 | Liquid crystal display panel and production method thereof |
| CN113126296A (en) * | 2020-01-15 | 2021-07-16 | 未来（北京）黑科技有限公司 | Head-up display equipment capable of improving light utilization rate |
| CN113126296B (en) * | 2020-01-15 | 2023-04-07 | 未来（北京）黑科技有限公司 | Head-up display equipment capable of improving light utilization rate |
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| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| ASS | Succession or assignment of patent right |
Free format text: FORMER OWNER: FAN BIN Effective date: 20050304 Owner name: JINGYING OPTICAL (SHANGHAI) CO., LTD. Free format text: FORMER OWNER: SHAO JIANXIN |
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| C10 | Entry into substantive examination | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| SE01 | Entry into force of request for substantive examination | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20050304 Address after: 200050, room 28, building 369, Jiangsu Road, Changning District, Shanghai, Applicant after: Crystal optics (Shanghai) Co.,Ltd. Address before: 200434 Shanghai City Rende Road 100 Lane No. 18 Room 601 Applicant before: Shao Jianxin Co-applicant before: Fan Bin |
|
| ASS | Succession or assignment of patent right |
Owner name: JINGYING OPTICAL TECHNOLOGY CO., LTD. Free format text: FORMER OWNER: JINGYING OPTICAL (SHANGHAI) CO., LTD. Effective date: 20050930 |
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| C41 | Transfer of patent application or patent right or utility model | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20050930 Address after: Virgin Islands (British) Applicant after: KINOPTICS TECHNOLOGIES Inc. Address before: 200050, room 28, building 369, Jiangsu Road, Changning District, Shanghai, Applicant before: Crystal optics (Shanghai) Co.,Ltd. |
|
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |