CN101840107A - Liquid crystal light valve (LCLV) with wide visual angle, high contrast ratio and rapid response - Google Patents
Liquid crystal light valve (LCLV) with wide visual angle, high contrast ratio and rapid response Download PDFInfo
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- CN101840107A CN101840107A CN 201010164993 CN201010164993A CN101840107A CN 101840107 A CN101840107 A CN 101840107A CN 201010164993 CN201010164993 CN 201010164993 CN 201010164993 A CN201010164993 A CN 201010164993A CN 101840107 A CN101840107 A CN 101840107A
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- wave plate
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Abstract
The invention belongs to an optical switch device, in particular to a liquid crystal light valve (LCLV) with wide visual angle, high contrast ratio and rapid response, comprising two polaroids, two a wave plates, two c wave plates and a liquid crystal box, wherein the two polaroids are respectively a polarizer and an analyzer; and the polarizer, a first a wave plate, a first c wave plate, the liquid crystal box, a second c wave plate, a second a wave plate and the analyzer are arranged successively, and light passes through the polarizer, the first a wave plate, the first c wave plate, the liquid crystal box, the second c wave plate, the second a wave plate and the analyzer successively. The LCLV of the invention adopts the liquid crystal box in an optical self-compensation bending (OCB) mode, liquid crystal molecules on the direction of the thickness of a liquid crystal layer have laterally zygomorphic orientation, and the two c wave plates and the two a wave plates of the liquid crystal box serve as compensation films with the maximum contrast ratio up to 2300. The viewing angle is quite wide, the contrast ratio on each direction within a polar angle range of 20 degrees can reach 1000, the contrast ratio on the horizontal direction within a polar angle range of minus 60 degrees/plus 60 degrees can reach 200, and the response time is 1.9ms.
Description
Technical field:
The invention belongs to optical switch device, particularly a kind of wide visual angle, high-contrast and the liquid crystal light valve that responds fast.Utilize an optics self compensation bending (Optical Compensated Bend:OCB) mode liquid crystal box, two-a wave plate, two-c wave plate and two polaroids to realize the optical switch effect.
Background technology:
Liquid crystal light valve (Liquid Crystal Light Valve) is called for short (LCLV), is a kind of spatial light modulator with real-time function that utilizes liquid crystal that the modulating characteristic of light is made.It can be widely used in modern high technology fields such as photometry calculation, pattern-recognition, information processing, demonstration, has a extensive future.Because it is independent mutually that liquid crystal light valve is write light inlet and read light, can be converted to coherent light to incoherent light easily, therefore in the coherent light real time processing system, the liquid crystal light valve device that is absolutely necessary.Liquid crystal light valve can also increase the energy of reading light simultaneously, realize that the energy of weak image amplifies, so it is widely used in also in the Projection Display of giant-screen, high brightness.
Traditional liquid crystal light valve adopts the twisted nematic liquid crystal box mostly, response time is tens milliseconds, contrast can reach about 200, the visual angle is narrow, if be applied in the Projection Display, only demonstrating literal and black and white picture then can satisfy the demand, if but be used for demonstrating coloury photo and displaying video animation then preferably select 1000: 1 above height to degree projector, response time is short more good more, response time is short more, similar ghost or dilatory vestige just can not appear in the user when seeing mobile picture, and the minority demonstration should require the visual angle more wide more mostly.Therefore, using traditional liquid crystal light valve that the twisted nematic liquid crystal box makes so just can not meet the demands.
Summary of the invention:
The objective of the invention is to solve the problem of visual angle, contrast and the response time of traditional liquid crystal light valve, the liquid crystal light valve that a kind of wide visual angle, high-contrast is provided and responds fast.The present invention adopts the ocb mode liquid crystal box with quick features of response, by the OCB box being carried out the film compensation and optimizing, realized the response time of 1.9ms, maximum-contrast reaches 2300, the visual angle is also very wide, contrast can reach 1000 on all directions of 20 ° of polar angle scopes, and positive and negative 60 ° of polar angle scope horizontal direction contrasts reach 200.
Technical solution of the present invention is as follows:
A kind of wide visual angle, high-contrast and the liquid crystal light valve that responds fast, its structure comprises: two polaroids, two-a wave plate, two-c wave plate and liquid crystal cell, wherein two polaroids are respectively the polarizer and analyzer; Its position relation is followed successively by the polarizer, first-a wave plate, first-c wave plate, liquid crystal cell, second-c wave plate, second-a wave plate and analyzer, and light is successively by the polarizer, first-a wave plate, first-c wave plate, liquid crystal cell, second-c wave plate, second-a wave plate and analyzer.
Described two polaroids all are to adopt the high-polarization polaroid.
The birefraction of described two-c wave plate and two-a wave plate all is identical, is-0.0092 (589nm).The thickness of two-a wave plate all is in 14～16 mu m ranges, and the thickness of two-c wave plate all is in 40～43 mu m ranges.
Described liquid crystal cell is the liquid crystal cell of ocb mode, comprising: glass substrate, tin indium oxide (ITO) electrode, oriented layer, liquid crystal material, envelope frame adhesive and spherical resin powder; Close its position: outermost layer is two sheet glass substrates, the glass substrate inside surface is an electrode, be oriented layer more inwards, the centre is liquid crystal material and sept, and during making alive, liquid crystal material is not arranged along the oriented layer direction that friction is good in advance, it is the antiparallel arrangement of liquid crystal molecule, liquid crystal molecule is the bend alignment structure when adding low-voltage, and arrange on liquid crystal molecule vertical substrate surface when adding high voltage, and the liquid crystal cell of this pattern has the characteristics of quick response.
Described two glass substrates rely on the glue bond of edge sealing frame together, place the thickness of controlling liquid crystal layer with the spherical resin powder of required thickness of liquid crystal layer coupling in liquid crystal.
Described envelope frame adhesive is formed enclosure space with layer glass substrate up and down between the layer glass substrate.
The thickness of described liquid crystal layer is 4 μ m, liquid crystal material parameter: ε
//=18.6, ε
⊥=3.5, n
o=1.5, Δ n=0.2, K
11=12.9pN, K
33=17.3pN, γ
1=0.134Pas, the border strong anchoring, the pre-dumping angle of two substrates place liquid crystal is respectively 5 ° and 175 ° up and down.
The method for making of the liquid crystal light valve of high-contrast recited above and quick response, its step is as follows:
Step 1 etches electrode pattern;
The present invention compared with prior art has following beneficial effect:
The characteristics of the liquid crystal light valve of the present invention's design are to use optics self compensation bending (OCB) mode liquid crystal box, ocb mode is owing to liquid crystal molecule on the thickness of liquid crystal layer direction has laterally zygomorphic orientation, so therefore electrooptics response speed height is applied in the requirement that can reach response speed in the liquid crystal light valve; Liquid crystal cell two-c wave plate and two-a wave plate film by way of compensation in addition, and use this pattern of suitable parameter optimization, making that the contrast of this liquid crystal light valve is very high, maximum-contrast reaches 2300.The visual angle is also very wide, and contrast can reach 1000 on all directions of 20 ° of polar angle scopes, and positive and negative 60 ° of polar angle scope horizontal direction contrasts reach 200.Response time is 1.9 milliseconds.
Description of drawings:
Fig. 1 is the liquid crystal light valve contour structures synoptic diagram of the wide visual angle of the present invention, high-contrast, quick response;
Fig. 2 is a liquid crystal cell structure synoptic diagram in the wide visual angle of the present invention, high-contrast, the quick liquid crystal light valve that responds;
Fig. 3 is that the liquid crystal molecule in the ocb mode liquid crystal box is not powering up, adding low-voltage and increasing arrangement synoptic diagram under the voltage condition respectively.
Fig. 4 is the contrast visual angle figure of the liquid crystal light valve of the wide visual angle of the present invention, high-contrast, quick response;
Fig. 5 is the wide visual angle of the present invention, high-contrast, the response time of the liquid crystal light valve of response schemes fast.
Embodiment:
The method for making of the liquid crystal light valve of high-contrast of the present invention and quick response, make according to following steps:
Step 1 etches electrode pattern;
Earlier on the ITO electro-conductive glass, apply photoresists, (lithography mask version is to make the black corresponding with electrode pattern on film to cover lithography mask version again, the clear area photoresist is reacted) under the effect of light, shine by ultraviolet light then, the ITO electrode layer is carried out the selective chemical corrosion, thereby on the ITO electro-conductive glass, obtain and the complete graph of a correspondence of mask.
On the good ITO electro-conductive glass of etching, be coated with alignment agent (polyamic acid solution), form uniform rete.Preliminary drying makes it volatilization with the heating of the solvent in the oriented material solution then, stays the oriented material rete of solid, solidifies 1～2 hour down at 300～350 ℃ then, and dehydration closed-loop generates polyimide film, has so just formed needed alignment films.
On alignment films, use flannelette to a direction friction, liquid crystal molecule in the liquid crystal layer will be arranged in parallel according to the direction of friction, so just can obtain consistent orientation and the needed inclination angle of this liquid crystal light valve, the pre-dumping angle of two substrates place liquid crystal is respectively 5 ° and 175 ° up and down.
On lower glass substrate, spray the spherical resin powder with duster, form more evenly and distribute, control the spacing between two glass substrates, adopt method for printing screen to come silk-screen frame adhesive and conductiving point glue on the top glass substrate, be used for controlling the size of made liquid crystal light valve and the public electrode between the conducting upper and lower base plate.
On the contraposition make-up machine, will go up lower glass substrate and carry out the contraposition applying, and use thermal curing methods about 200 ℃, frame adhesive to be solidified, form the liquid crystal sylphon.
Sylphon is placed in the liquid crystal filling confined chamber that vacuumizes, and the gas in the box is extracted out by sealing part, makes filling orifice (breach of sealed frame) contact liquid crystal then, liquid crystal material parameter: ε
//=18.6, ε
⊥=3.5, n
o=1.5, Δ n=0.2, K
11=12.9pN, K
33=17.3pN, γ
1=0.134Pas.Utilize capillarity, just most of volume of sylphon can be injected liquid crystal material, to the indoor inert gases such as fully dry argon gas of process and nitrogen that charge into of liquid crystal filling, utilize the pressure of inert gas to make liquid crystal material be full of liquid crystal cell fully again.Adopt that fluid sealant is bonding to seal, by freezing method, allow sealing compound shrink rightly to bring into seal in, solidify with UV-irradiation again.
Some sealing compounds, liquid crystal and other dirt removals of liquid crystal cell remained on surface fallen in frictioning and cleaning.Just can fit two-a wave plate, two-c wave plate and two polaroids then.-a wave plate ,-c wave plate birefraction is-0.0092 (589nm), and the thickness of two-a wave plate all is in 14～16 mu m ranges, and the position angle of two-c wave plate all is 0 °, and thickness all is in 40～43 mu m ranges.Polaroid adopts the high-polarization polaroid, the SKN-18243T that Polatechno company produces.Position angle according to the polarizer is-41 °, the position angle of analyzer is 49 °, the position angle of first-a wave plate is 45.3 °, the position angle of second-a wave plate is 45.3 ° of fit two biaxial compensation films and two polaroids, the liquid crystal light valve that obtains this wide visual angle, high-contrast at last and respond fast.
It is known technology that above method for making is not stated content, specifically can be with reference to " the liquid crystal device technology basis " by publishing house of Beijing University of Post ﹠ Telecommunication publishes, model will is newly write.
The contour structures of the liquid crystal light valve that the present invention makes as shown in Figure 1, light is successively by the polarizer 1, first-a wave plate 2, first-c wave plate 3, liquid crystal cell 4, second-c wave plate 5, second-a wave plate 6, analyzer 7.The structure of liquid crystal cell as shown in Figure 2, the outermost layer of liquid crystal cell is a glass substrate 8, the glass substrate inside surface is an electrode 9, be oriented layer 10 more inwards, inside is that liquid crystal material 11 is arranged along the good direction of oriented layer 10 friction in advance, two glass substrates 8 rely on envelope frame glue 12 to bond together, and the spherical resin powder 13 of placing diameter and be 4 μ m in liquid crystal is controlled the thickness of liquid crystal layer.Fig. 3 is that the liquid crystal molecule in the ocb mode liquid crystal box is not powering up, adding low-voltage and increasing arrangement synoptic diagram under the voltage condition respectively.The not antiparallel arrangement of liquid crystal molecule during making alive is shown in Fig. 3 (a); Be that warp architecture is arranged when adding low-voltage, shown in Fig. 3 (b); Be that arrange on the vertical substrate surface when adding high voltage, shown in Fig. 3 (c).
The thickness of liquid crystal layer is 4 μ m, liquid crystal material (MLC-2136 that Merck company produces) parameter: ε
//=18.6, ε
⊥=3.5, n
o=1.5, Δ n=0.2, K
11=12.9pN, K
33=17.3pN, γ
1=0.134Pas, the border strong anchoring, the pre-dumping angle of two substrates place liquid crystal is respectively 5 ° and 175 ° up and down.-a wave plate ,-c wave plate birefraction is-0.0092 (589nm), and the thickness of two-a wave plate all is in 14～16 mu m ranges, and the position angle of two-c wave plate all is 0 °, and thickness all is in 40～43 mu m ranges.Polaroid adopts high-polarization polaroid (SKN-18243T that Polatechno company produces).The position angle on liquid crystal layer plane is 0 °, and the position angle of the polarizer 1 is-41 °, and the position angle of analyzer 7 is 49 °, and the position angle of first-a wave plate 2 is 45.3 °, and the position angle of second-a wave plate 6 is 45.3 °.
Add low-voltage U earlier
1=1.2V, liquid crystal molecule are warp architecture and arrange, and this moment, liquid crystal cell was bright attitude, and corresponding transmitance is bright attitude transmitance.Then with low-voltage U
1=1.2V becomes high voltage U
2=14V, liquid crystal molecule arrange perpendicular to orientation substrate gradually, and this moment, the transmitance of liquid crystal cell reduced gradually, and final liquid crystal cell is dark attitude, and corresponding transmitance is dark attitude transmitance.Again with high voltage U
2=14V becomes low-voltage U
1Behind=the 1.2V, because the effect of the elastic force in the liquid crystal layer, liquid crystal molecule can change back to the bend alignment state again gradually, and this moment, the transmitance of liquid crystal cell increased gradually, and final liquid crystal cell shows as bright attitude again.Contrast can be represented with the bright attitude transmitance and the ratio of dark attitude transmitance.The contrast visual angle figure of this liquid crystal light valve can obtain with Mouse-LCD 2.6 software simulations, and as shown in Figure 4, curve outwards represents successively that from the lining contrast is 2000,1000,500,200 among the figure, and 100,50,10,5,1 zone.The result of simulation softward shows that maximum-contrast can reach 2300.Also the visual angle of this liquid crystal cell is very wide as can be seen from figure, and contrast can reach 1000 on all directions of 20 ° of polar angle scopes, and positive and negative 60 ° of polar angle scope horizontal direction contrasts reach 200.The timing definition that will drop between 10% from transmitance peaked 90% is the rise time; The timing definition that rises between 90% from transmitance peaked 10% is fall time.The summation of rise time and fall time is defined as the response time.The response time figure of this liquid crystal light valve can obtain by analog computation, as shown in Figure 5.With low-voltage U
1=1.2V becomes high voltage U
2Behind=the 14V, the transmitance of liquid crystal cell can reduce gradually, shown in curve a.With high voltage U
2=14V becomes low-voltage U
1Behind=the 1.2V, the transmitance of liquid crystal cell increases gradually, shown in curve b.According to the definition of response time, can obtain from Fig. 5: the rise time is about 0.1ms, is about 1.8ms fall time, and overall response time is about 1.9ms.This liquid crystal light valve satisfies the requirement of wide visual angle, high-contrast and fast response liquid crystal light valve.
Fig. 4 and Fig. 5 are that the thickness according to two-a wave plate is 15 μ m, and the thickness of two-c wave plate is that 40 μ m obtain.When the thickness of two-a wave plate all is in 14～16 mu m ranges, the thickness of two-c wave plate all be other data in 40～43 mu m ranges obtain etc. contrast visual angle figure constant substantially, the description of curve is also satisfied the result of these data among the figure.Response time also is the same.
The present invention does not address part and is applicable to prior art.
Claims (8)
1. a wide visual angle, high-contrast and the liquid crystal light valve of response fast is characterized by and comprise: two polaroids, two-a wave plate, two-c wave plate and liquid crystal cell, and wherein two polaroids are respectively the polarizer and analyzer; Its position relation is followed successively by the polarizer, first-a wave plate, first-c wave plate, liquid crystal cell, second-c wave plate, second-a wave plate and analyzer, and light is successively by the polarizer, first-a wave plate, first-c wave plate, liquid crystal cell, second-c wave plate, second-a wave plate and analyzer.
2. wide according to claim 1 visual angle, high-contrast and the liquid crystal light valve that responds fast, it is characterized by described two polaroids all is to adopt the high-polarization polaroid.
3. wide according to claim 1 visual angle, high-contrast and the liquid crystal light valve that responds fast, the birefraction that it is characterized by described two-c wave plate and two-a wave plate all is identical, is-0.0092 (589nm).The thickness of two-a wave plate all is in 14～16 mu m ranges, and the thickness of two-c wave plate all is in 40～43 mu m ranges.
4. wide according to claim 1 visual angle, high-contrast and the liquid crystal light valve that responds fast, it is characterized by the liquid crystal cell that described liquid crystal cell is an ocb mode, comprising: glass substrate, tin indium oxide (ITO) electrode, oriented layer, liquid crystal material, envelope frame adhesive and spherical resin powder; Close its position: outermost layer is two sheet glass substrates, and the glass substrate inside surface is an electrode, is oriented layer more inwards, and the centre is liquid crystal material and sept.
5. wide according to claim 1 visual angle, high-contrast and the liquid crystal light valve that responds fast, it is characterized by described two glass substrates and rely on the glue bond of edge sealing frame together, in liquid crystal, place the thickness of controlling liquid crystal layer with the spherical resin powder of required thickness of liquid crystal layer coupling.
6. wide according to claim 1 visual angle, high-contrast and the liquid crystal light valve of response fast is characterized by described envelope frame adhesive between the layer glass substrate, form enclosure space with layer glass substrate up and down.
7. wide according to claim 1 visual angle, high-contrast and the liquid crystal light valve that responds fast, the thickness that it is characterized by described liquid crystal layer is 4 μ m, liquid crystal material parameter: ε
//=18.6, ε
⊥=3.5, n
o=1.5, Δ n=0.2, K
11=12.9pN, K
33=17.3pN, γ
1=0.134Pas, the border strong anchoring, the pre-dumping angle of two substrates place liquid crystal is respectively 5 ° and 175 ° up and down.
8. high-contrast and the fast method for making of the liquid crystal light valve of response according to claim 1, it is as follows to it is characterized by step:
Step 1 etches electrode pattern;
Step 2, oriented layer coating and curing;
Step 3, the oriented layer friction;
Step 4, lower glass substrate is sprayed the spherical resin powder, top glass substrate printing envelope frame adhesive;
Step 5, last lower glass substrate are fitted and with the adhesive curing of edge sealing frame;
Step 6, the perfusion liquid crystal material also seals;
Step 7 is cleaned the glass surface and the two-a wave plate of fitting, two-c wave plate, and the polarizer and analyzer, the liquid crystal light valve that obtains this wide visual angle, high-contrast at last and respond fast.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010164993 CN101840107A (en) | 2010-05-07 | 2010-05-07 | Liquid crystal light valve (LCLV) with wide visual angle, high contrast ratio and rapid response |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010164993 CN101840107A (en) | 2010-05-07 | 2010-05-07 | Liquid crystal light valve (LCLV) with wide visual angle, high contrast ratio and rapid response |
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| CN101840107A true CN101840107A (en) | 2010-09-22 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103105688A (en) * | 2012-12-12 | 2013-05-15 | 河北工业大学 | Multi-domain twisted nematic liquid crystal display |
| CN103676363A (en) * | 2013-12-16 | 2014-03-26 | 信利半导体有限公司 | Liquid crystal light valve |
| CN111367102A (en) * | 2020-05-08 | 2020-07-03 | 康惠（惠州）半导体有限公司 | Vertically-oriented liquid crystal light valve lens assembly |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1305603A (en) * | 1998-04-08 | 2001-07-25 | 松下电器产业株式会社 | Parallel orientation liquid crystal display element and its making method, and spray-bent transition time evaluating method and its evaluating device |
| CN1659471A (en) * | 2002-04-04 | 2005-08-24 | 三星电子株式会社 | Liquid crystal display provided with compensation film |
-
2010
- 2010-05-07 CN CN 201010164993 patent/CN101840107A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1305603A (en) * | 1998-04-08 | 2001-07-25 | 松下电器产业株式会社 | Parallel orientation liquid crystal display element and its making method, and spray-bent transition time evaluating method and its evaluating device |
| CN1659471A (en) * | 2002-04-04 | 2005-08-24 | 三星电子株式会社 | Liquid crystal display provided with compensation film |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103105688A (en) * | 2012-12-12 | 2013-05-15 | 河北工业大学 | Multi-domain twisted nematic liquid crystal display |
| CN103676363A (en) * | 2013-12-16 | 2014-03-26 | 信利半导体有限公司 | Liquid crystal light valve |
| CN103676363B (en) * | 2013-12-16 | 2016-06-08 | 信利半导体有限公司 | A kind of liquid crystal light valve |
| CN111367102A (en) * | 2020-05-08 | 2020-07-03 | 康惠（惠州）半导体有限公司 | Vertically-oriented liquid crystal light valve lens assembly |
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Addressee: Zhao Fengying Document name: Notification of Passing Preliminary Examination of the Application for Invention |
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Application publication date: 20100922 |