CN101840104A - Liquid crystal light valve having high contrast and quick response - Google Patents

Liquid crystal light valve having high contrast and quick response Download PDF

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Publication number
CN101840104A
CN101840104A CN 201010164956 CN201010164956A CN101840104A CN 101840104 A CN101840104 A CN 101840104A CN 201010164956 CN201010164956 CN 201010164956 CN 201010164956 A CN201010164956 A CN 201010164956A CN 101840104 A CN101840104 A CN 101840104A
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liquid crystal
contrast
light valve
fast
biaxial film
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CN 201010164956
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CN101840104B (en
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单艾娴
孙玉宝
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Hebei University of Technology
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Hebei University of Technology
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Abstract

The invention belongs to optical switch devices and particularly relates to a liquid crystal light valve having high contrast and quick response. The light valve comprises two polaroids, two biaxial films and a liquid crystal cell, wherein the two polaroids are respectively a polarizer and an analyzer; and the polarizer, the first biaxial film, the liquid crystal cell, the second biaxial film and the analyzer are sequentially arranged, so that light can sequentially pass through the polarizer, the first biaxial film, the liquid crystal cell, the second biaxial film and the analyzer. The liquid crystal molecules in the thickness direction of a liquid crystal layer have the orientation of up-and-down symmetry in the invention, thus meeting the requirement for response speed; the two biaxial films are used for compensating and optimizing the azimuth angles of the compensation film and the polaroids, thus increasing the contrast; and the response time of the liquid crystal light valve reaches 1.5ms, the maximum contrast thereof reaches 2,200, the azimuth angles in horizontal and vertical directions in the area where the contrast is higher than 1,000 are larger than 20 degrees, and those in horizontal and vertical directions in the area where the contrast is higher than 100 are close to 50 degrees.

Description

A kind of high-contrast and the liquid crystal light valve that responds fast
Technical field
The invention belongs to optical switch device, the liquid crystal light valve that is particularly related to a kind of high-contrast and responds fast utilizes an optics self compensation bending (Optical Compensated Bend:OCB) mode liquid crystal box, two biaxial film 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 more, response time is tens milliseconds, contrast can reach about 200, if be applied to Projection Display in, 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, and the response time is short more good more, and similar ghost or dilatory vestige just can not appear in the user when seeing mobile picture.The liquid crystal light valve of using the making of twisted nematic liquid crystal box so just can not meet the demands.
Summary of the invention
The objective of the invention is to solve the contrast of traditional liquid crystal light valve and the problem of response time, the liquid crystal light valve that a kind of 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 1.5ms, maximum-contrast reaches 2200, contrast is that the zone more than 1000 surpasses 20 ° in the horizontal and vertical directions, and contrast is that zone more than 100 is in the horizontal and vertical directions near 50 °.
Technical solution of the present invention is as follows:
A kind of high-contrast and the quick liquid crystal light valve of response, its structure comprises: two polaroids, two biaxial film and liquid crystal cell, wherein two polaroids are respectively the polarizer and analyzer; Its position relation is followed successively by: the polarizer, first biaxial film, liquid crystal cell, second biaxial film and analyzer, light are successively by the polarizer, first biaxial film, liquid crystal cell, second biaxial film and analyzer.
Described two polaroids all are to adopt the high-polarization polaroid.
The refractive index parameter of described two biaxial film is the same, is: Nx=1.5827, Ny=1.581, Nz=1.5799.Two biaxial film thickness are in 49~57 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;
Step 2, oriented layer coating and curing;
Step 3, the oriented layer friction;
Step 4, lower glass substrate spray 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 two biaxial compensation films of fitting, and the polarizer and analyzer.The liquid crystal light valve that obtains this high-contrast at last and respond fast.
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 the 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 has two biaxial film to compensate in addition, and the position angle of compensate film and polaroid is optimized to improve its contrast.Can reach 1.5ms through the response time of optimizing later ocb mode liquid crystal light valve like this, maximum-contrast reaches 2200, contrast is that the zone more than 1000 surpasses 20 ° in the horizontal and vertical directions, and contrast is that zone more than 100 is in the horizontal and vertical directions near 50 °.
Description of drawings
Fig. 1 is the liquid crystal light valve contour structures synoptic diagram of high-contrast of the present invention, quick response.
Fig. 2 is the structural representation of liquid crystal cell in high-contrast of the present invention, 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 high-contrast of the present invention, quick response.
Fig. 5 is a high-contrast of the present invention, 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.
Step 2, oriented layer coating and curing.
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.
Step 3, the oriented layer friction.
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.
Step 4, it is the spherical resin powder of 4 μ m that lower glass substrate is sprayed diameter, top glass substrate printing envelope frame adhesive and conducting resinl.
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.
Step 5, last lower glass substrate are fitted and with the adhesive curing of edge sealing frame.
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.
Step 6, the perfusion liquid crystal material also seals.
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.
Step 7 is cleaned glass surface and fit two biaxial compensation films and two polaroids (being the polarizer and analyzer).
Some sealing compounds, liquid crystal and other dirt removals of liquid crystal cell remained on surface fallen in frictioning and cleaning.Just can fit biaxial compensation film and two polaroids then.The refractive index parameter of biaxial compensation film is: Nx=1.5827, and Ny=1.581, Nz=1.5799, the thickness of two biaxial film are at 49~57 mu m ranges.Polaroid adopts the high-polarization polaroid, the SKN-18243T that Polatechno company produces.Position angle according to biaxial film 1 is-88 °, and the position angle of biaxial film 2 is-88 °, and the position angle of the polarizer is-2 °, and the position angle of analyzer is 88 ° of fit two biaxial compensation films and two polaroids.
The liquid crystal light valve that obtains this 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 biaxial film 2, liquid crystal cell 3, second biaxial film 4, analyzer 5.The structure of liquid crystal cell as shown in Figure 2, outermost layer is a glass substrate 6, the glass substrate inside surface is an electrode 7, be oriented layer 8 more inwards, inside is that liquid crystal material 9 is arranged along the good direction of oriented layer 8 friction in advance, two glass substrates 6 rely on envelope frame glue 10 to bond together, and the spherical resin powder 11 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.The refractive index parameter of biaxial compensation film is: Nx=1.5827, and Ny=1.581, Nz=1.5799, the thickness of two biaxial film are at 49~57 mu m ranges.Two polaroids (being the polarizer and analyzer) all adopt high-polarization polaroid (SKN-18243T that Polatechno company produces).The position angle on liquid crystal layer plane is 45 °, and the position angle of the polarizer 1 is-2 °, and the position angle of analyzer 5 is 88 °, and the position angle of first biaxial film 2 is-88 °, and the position angle of second biaxial film 4 is-88 °.
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 represents successively that outside in contrast is 1,5,10,100 among the figure, 1000 zone.The result of simulation softward shows that maximum-contrast can reach 2200, and contrast is that the zone more than 1000 surpasses 20 ° in the horizontal and vertical directions, and contrast is that zone more than 100 is in the horizontal and vertical directions near 50 °.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 1.4ms fall time, and overall response time is about 1.5ms, and this liquid crystal light valve satisfies the requirement of high-contrast and fast response liquid crystal light valve.
Fig. 4 and Fig. 5 are that the thickness according to two biaxial film all is that 50 μ m obtain, when thickness other data in 49~57 mu m ranges of two biaxial film 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. the high-contrast and the liquid crystal light valve of response fast is characterized by this light valve and comprise: two polaroids, two biaxial film and liquid crystal cell, and wherein two polaroids are respectively the polarizer and analyzer; Its position relation is followed successively by: the polarizer, first biaxial film, liquid crystal cell, second biaxial film and analyzer, light are successively by the polarizer, first biaxial film, liquid crystal cell, second biaxial film and analyzer.
2. high-contrast and the fast liquid crystal light valve of response according to claim 1, it is characterized by described two polaroids all is to adopt the high-polarization polaroid.
3. high-contrast and the fast liquid crystal light valve of response according to claim 1, the refractive index parameter that it is characterized by described two biaxial film is the same, is: Nx=1.5827, Ny=1.581, Nz=1.5799.Two biaxial film thickness are in 49~57 mu m ranges.
4. high-contrast and the fast liquid crystal light valve of response according to claim 1, 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. the high-contrast and the liquid crystal light valve of response according to claim 1 fast is characterized by described two glass substrates and 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.
6. high-contrast and the fast liquid crystal light valve of response according to claim 1 is characterized by described envelope frame adhesive between the layer glass substrate, form enclosure space with layer glass substrate up and down.
7. high-contrast and the fast liquid crystal light valve of response according to claim 1, 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 fast the liquid crystal light valve method for making 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 spray 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 two biaxial compensation films of fitting, and the polarizer and analyzer, the liquid crystal light valve that obtains this high-contrast at last and respond fast.
CN2010101649567A 2010-05-07 2010-05-07 Liquid crystal light valve having high contrast and quick response Expired - Fee Related CN101840104B (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102902105A (en) * 2012-11-06 2013-01-30 深圳市华星光电技术有限公司 Compensation system for liquid crystal panel and liquid crystal display device
CN102944954A (en) * 2012-11-21 2013-02-27 深圳市华星光电技术有限公司 Compensation system and liquid crystal display (LCD) device for LCD panel

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Publication number Priority date Publication date Assignee Title
JPH0784254A (en) * 1993-09-18 1995-03-31 Tatsuo Uchida Liquid crystal display element for wide visual field angle and high-speed display
US20030193637A1 (en) * 2002-04-12 2003-10-16 Eastman Kodak Company Bend aligned namatic liquid crystal imaging display with compensation film
CN1745331A (en) * 2003-01-28 2006-03-08 Lg化学株式会社 Bi-axial retardation compensation film and vertically aligned liquid crystal display using the same
CN1918508A (en) * 2004-02-13 2007-02-21 东芝松下显示技术有限公司 Liquid crystal display device
CN1979288A (en) * 2005-12-09 2007-06-13 群康科技(深圳)有限公司 Liquid crystal displaying device
CN201707522U (en) * 2010-05-07 2011-01-12 河北工业大学 High contrast and fast response liquid crystal light valve

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0784254A (en) * 1993-09-18 1995-03-31 Tatsuo Uchida Liquid crystal display element for wide visual field angle and high-speed display
US20030193637A1 (en) * 2002-04-12 2003-10-16 Eastman Kodak Company Bend aligned namatic liquid crystal imaging display with compensation film
CN1745331A (en) * 2003-01-28 2006-03-08 Lg化学株式会社 Bi-axial retardation compensation film and vertically aligned liquid crystal display using the same
CN1918508A (en) * 2004-02-13 2007-02-21 东芝松下显示技术有限公司 Liquid crystal display device
CN1979288A (en) * 2005-12-09 2007-06-13 群康科技(深圳)有限公司 Liquid crystal displaying device
CN201707522U (en) * 2010-05-07 2011-01-12 河北工业大学 High contrast and fast response liquid crystal light valve

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102902105A (en) * 2012-11-06 2013-01-30 深圳市华星光电技术有限公司 Compensation system for liquid crystal panel and liquid crystal display device
CN102944954A (en) * 2012-11-21 2013-02-27 深圳市华星光电技术有限公司 Compensation system and liquid crystal display (LCD) device for LCD panel
CN102944954B (en) * 2012-11-21 2015-11-25 深圳市华星光电技术有限公司 For bucking-out system and the liquid crystal indicator of liquid crystal panel

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