CN102566109A - Bistable liquid crystal grating - Google Patents
Bistable liquid crystal grating Download PDFInfo
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- CN102566109A CN102566109A CN2010106041469A CN201010604146A CN102566109A CN 102566109 A CN102566109 A CN 102566109A CN 2010106041469 A CN2010106041469 A CN 2010106041469A CN 201010604146 A CN201010604146 A CN 201010604146A CN 102566109 A CN102566109 A CN 102566109A
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Abstract
The invention relates to a liquid crystal grating which comprises upper and lower glass base plates and a liquid crystal layer, wherein a comb-shaped transparent electrode layer and an orienting layer are arranged on both of the glass base plates; the orienting layer is divided into an upper orienting layer and a lower orienting layer; a barrier layer is arranged between each glass base plate and the orienting layer; the liquid crystal layer is arranged between the two glass base plates and are in direct contact with the orienting layers; a conductive layer is divided into an upper conductive electrode and a lower conductive electrode; and both the upper conductive electrode and the lower conductive electrode are round comb-shaped electrodes and are oppositely arranged. Generally, a nematic phase liquid crystal is applied to a common liquid crystal grating; the liquid crystal filled into the liquid crystal grating is cholesteric liquid crystal; according to the bistable characteristics of the cholesteric liquid crystal, the liquid crystal grating subjected to a certain surface treatment is capable of working in a null field state; different voltage pulses are utilized to realize the adjustable electric field for controlling the diffraction strength of the liquid crystal grating; the liquid crystal grating provided by the invention is simple in manufacturing process, is energy-saving and is free from polarization film; and the diffraction strength of the grating can be controlled by adjusting the electric field.
Description
Technical field
The present invention relates to a kind of optical element---grating, particularly a kind of liquid crystal grating.
Background technology
Grating is also claimed diffraction grating, is to utilize many seam diffraction principle to make the optical element of light generation chromatic dispersion.Grating be one be carved with that massive parallel is wide, the flat glass of equidistance slit or sheet metal, its slot number is many, usually, every millimeter has tens to several thousand not wait.Monochromatic collimated beam forms the pattern that dark fringe is very wide, bright fringe is very thin through the diffraction of each seam of grating and the interference between each seam, and these sharp thin and bright stripeds are called spectral line.The position of spectral line is different with wavelength, and after polychromatic light passed through grating, the spectral line of different wave length occurred and formation spectrum in different positions.Light is the common result of single slit diffraction and multislit interference through the spectrum that grating forms.
Liquid crystal has the two characteristic of liquid and crystal concurrently in certain temperature range, so Liquid Crystal Molecules Alignment is not firm as crystal structure, softness and easy deformation.If surface treatment nematic liquid crystal box is applied an electric field vertical with the molecule director; Liquid crystal inside will receive the influence of two torques: one is the torque that external electric field applies liquid crystal, and another is owing to the distortion torque that caused by the boundary condition restriction.Under equilibrium state, the effect of two torques is cancelled out each other.In case electric field surpasses certain threshold value, liquid crystal molecule will turn to the direction of external electric field to arrange.During to the liquid crystal cell impressed voltage, liquid crystal grating anisotropy and dielectric anisotropy will change thereupon, thereby produce the electrically conerolled birefringence phenomenon.Ordinary light and the phase differential of extraordinary ray generation and the device that deflection characteristic changes that liquid crystal grating has utilized the variation of optical characteristics cycles such as liquid-crystal refractive-index to cause just.This electro-optical characteristic of liquid crystal grating is with a wide range of applications in many fields such as optical computing processing, diffraction optics, 3-D view demonstration and optoelectronic switches.
At present, in the prior art, the most nematic liquid crystals that adopt of liquid crystal grating must could be worked under the electric field that continues, and aspect energy efficient, exist not enough.
Summary of the invention
According to the deficiency that prior art exists, the present invention provides a kind of and can under null field, work and realize the bistable liquid crystal grating that the electric field diffraction efficiency is adjustable.
Technical scheme of the present invention is: a kind of bistable liquid crystal grating; Comprise two identical glass substrates and liquid crystal layer; Be respectively arranged with conductive layer on the surface of glass substrate, this liquid crystal layer is folded between two glass plates, and liquid crystal is that cholesteric liquid crystal and liquid crystal layer directly contact with oriented layer; Said conductive layer comprises conductive electrode and following conductive electrode, and said upward conductive electrode and said conductive electrode down are oppositely arranged.
The present invention compared with prior art; Liquid crystal grating of the present invention is employed on two glass plates and is respectively arranged with oriented layer; Said oriented layer is the friction orientation layer, and said liquid crystal layer is a cholesteric liquid crystal, is implemented in work under the null field through applying different pulse voltages; Can realize that liquid crystal grating diffraction efficiency electric field is adjustable, can practice thrift the energy consumption of liquid crystal grating greatly.
Preferably, two of described liquid crystal grating said conductive layers are indium tin metal oxide.
Preferably, the said tip and the end of going up conductive electrode and following conductive electrode of said liquid crystal grating all designs for circular arc.Avoid bus two ends CHARGE DISTRIBUTION too intensive and caused strong electric field, thereby improved the effect of liquid crystal grating.
Preferably, the liquid crystal layer of described liquid crystal grating is a cholesteric liquid crystal, replaces traditional nematic liquid crystal, according to the bistable characteristic of cholesteric liquid crystal, realizes the work down of liquid crystal grating null field, thus the energy consumption of having practiced thrift liquid crystal grating greatly.
Said glass substrate is a soda-lime glass.
Said lower glass substrate is provided with light-absorption layer.
Description of drawings
Below in conjunction with accompanying drawing the present invention is detailed.
Fig. 1 is the cross-sectional view of liquid crystal grating of the present invention.
Fig. 2 is the synoptic diagram of the top electrode of liquid crystal grating shown in Figure 1.
Fig. 3 is the synoptic diagram of liquid crystal grating bottom electrode shown in Figure 1.
Fig. 4 is the structural representation of liquid crystal grating electrode stack of the present invention.
Fig. 5 is a liquid crystal grating task driven synoptic diagram of the present invention.
Wherein among the figure: 1. top glass substrate, 2. lower glass substrate, 3. liquid crystal layer, 4. go up oriented layer, 5. descend oriented layer, 6. go up conductive electrode, 7. descend conductive electrode, 8. restraining barrier, 9. light-absorption layer.
Embodiment
With reference to Fig. 1 and Fig. 5, the present invention is a kind of bistable liquid crystal grating, comprises top glass substrate 1 and lower glass substrate 2; And liquid crystal layer 3; This two glass substrate is a soda-lime glass, is provided with pectination transparent electrode layer and oriented layer above the upper and lower glass substrate 1,2, and lower glass substrate 2 is provided with light-absorption layer 9; Oriented layer is divided into oriented layer 4 and following oriented layer 5, and last oriented layer 4 is the friction orientation layer with following oriented layer 5.Upper and lower glass substrate 1,2 respectively and upper and lower oriented layer 4, be equipped with one deck restraining barrier 8 between 5; Restraining barrier 8 is a silicon dioxide; Liquid crystal layer 3 is located at two glass substrates 1, between 2, the liquid crystal of perfusion is a cholesteric liquid crystal among the liquid crystal layer 3, liquid crystal layer 3 directly contacts with said oriented layer; Conductive layer is divided into conductive electrode 6 and following conductive electrode 7, and conductive layer is an indium tin metal oxide.The top of upper and lower conductive electrode 6,7 is a circular arc, and last conductive electrode 6 is respectively the nose circle comb electrode with following conductive electrode 7 and is oppositely arranged, and sees Fig. 2-shown in Figure 4.
With reference to Fig. 6, under no-voltage, cholesteryl liquid crystal is in planar structure (P attitude), and liquid crystal has periodic helical structure, and its screw axis is vertical with liquid crystal cell.When the P attitude; If the wavelength X of incident light and spiral are complementary apart from p, i.e. λ=np, n is the mean refractive index of liquid crystal; Then light will be reflected; Catoptrical wavelength can widen the wavelength X scope with adopting different liquid crystal and in liquid crystal, adding different additives through taking certain surface treatment in the liquid crystal grating of making, with the voltage V of certain intensity by spiral apart from controlling
1(threshold voltage) is added on the liquid crystal material, and liquid crystal will be converted to burnt wimble structure (FC attitude), under the FC state; Liquid crystal molecule is in a kind of multidomain state, still exist in each farmland inside spin structure, but the screw axis on different farmlands is disorderly and unsystematic in the orientation in space; This moment, periodic structure did not exist, and incident light can not reflect but diffuse reflection, and liquid crystal presents milky; If voltage from this low drop to zero; Burnt awl attitude will be metastable state or stable state, can make it become stable state through certain surface treatment, as on liquid crystal, adding sufficiently high voltage V
2(saturation voltage), liquid crystal will change to nematic phase state (H attitude), and all molecules are all arranged along direction of an electric field; This moment, liquid crystal was transparent, if drop to zero to voltage fast, liquid crystal molecule will directly be got back to the P attitude; If slowly reduce voltage, liquid crystal molecule will change and get back to the FC attitude.FC attitude and P attitude can be in steady state (SS) under the null field state, the bistable operation principle of Here it is cholesteryl liquid crystal.
When cholesteric liquid crystal is in the FC attitude, liquid crystal is the multidomain structure of similar crystal domain, most of light behind liquid crystal before scattering; Be absorbed by the absorption layer; If this novel liquid crystal grating is directed as the PI layer frictional strength of common liquid crystal grating, make and arrange along frictional direction near the liquid crystal molecule of PI layer, be parallel to the surface; When liquid crystal is in the FC attitude; The interaction of orientation effect of PI layer and liquid crystal molecule between impels liquid crystal to change to the P attitude, forms monocrystalline, and liquid crystal can not be stabilized in the FC attitude for a long time.And do not have capacity of orientation without the PI layer of friction orientation, and PI layer heterogeneity causes the existence of defective, and defective impels cholesteric liquid crystal to form multidomain structure; After liquid crystal forms multidomain structure; The FC attitude is the long-time stable existence of ability just, if but not carrying out friction orientation, liquid crystal molecule can be not regular very more in the arrangement of planar texture state; The reflectivity of plane attitude is reduced; Therefore will take a kind of suitable frictional strength orientation, make the higher FC attitude that can make again of reflectivity of planimetric map more stable, at this moment cholesteric liquid crystal just has bistable behavior preferably.
This bistable state cholesteric phase liquid crystal grating can realize that different diffraction intensity is adjustable, at first liquid crystal grating is applied a high impulse V
2, being in the H attitude during the high impulse, high impulse later obtains the P attitude, and then to add an amplitude be V
1Low pulse, pulse later liquid crystal is the FC attitude, when the pulse height amplitude at V
1, V
2Between the time; Liquid crystal is in the mixed state of P attitude and FC attitude; The intermediate state that these liquid crystal are in P attitude and the mixing of FC attitude is stable equally; This moment the FC attitude reflectivity along with the rising of pulse voltage linear the increase, along with the rising of pulse voltage, P attitude content increases up to pulse voltage gradually and reaches V in the sample
2Therefore through liquid crystal grating being applied the pulse of different amplitudes, can obtain different diffracted intensities, thereby realize that the liquid crystal grating diffracted intensity is adjustable.
Claims (8)
1. bistable liquid crystal grating; It is characterized in that, comprise upper and lower glass substrate and liquid crystal layer, be provided with pectination transparent electrode layer and novel oriented layer above the said upper and lower glass substrate; Said oriented layer is the oriented layer that is different from general liquid crystal grating frictional strength; Upper and lower glass substrate respectively and be equipped with one deck restraining barrier between the upper and lower oriented layer, said liquid crystal layer is located between two glass substrates, and said liquid crystal layer directly contacts with said oriented layer; Said conductive layer is divided into conductive electrode and following conductive electrode, and said upward conductive electrode is respectively the nose circle comb electrode with following conductive electrode and is oppositely arranged.
2. bistable liquid crystal grating as claimed in claim 1 is characterized in that, said conductive layer is an indium tin metal oxide.
3. bistable liquid crystal grating as claimed in claim 2 is characterized in that, the said top of conductive electrode up and down is a circular arc.
4. bistable liquid crystal grating as claimed in claim 1 is characterized in that, said liquid crystal layer liquid crystal is a cholesteric liquid crystal.
5. bistable liquid crystal grating as claimed in claim 1 is characterized in that, said restraining barrier is a silicon dioxide.
6. bistable liquid crystal grating as claimed in claim 1 is characterized in that, said oriented layer is the friction orientation layer.
7. bistable liquid crystal grating as claimed in claim 1 is characterized in that, said glass substrate is a soda-lime glass.
8. bistable liquid crystal grating as claimed in claim 1 is characterized in that said lower glass substrate is provided with light-absorption layer.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102866554A (en) * | 2012-10-10 | 2013-01-09 | 南京大学 | Broadband-adjustable terahertz wave plate |
| CN102967957A (en) * | 2012-11-21 | 2013-03-13 | 合肥工业大学 | Low-power-consumption electronic control liquid crystal light valve device capable of regulating transmittivity by self |
| CN103064226A (en) * | 2013-01-05 | 2013-04-24 | 东南大学 | Liquid crystal based electronically-controlled adjustable phase grating |
| CN104777651A (en) * | 2015-04-29 | 2015-07-15 | 厦门大学 | Polymerization method for cholesteric liquid crystal grating pattern |
| CN106444175A (en) * | 2016-09-28 | 2017-02-22 | 哈尔滨工程大学 | Phase type liquid crystal grating with electrically-controlled continuous tuning diffraction spot positions and manufacturing method of phase type liquid crystal grating |
| CN108508670A (en) * | 2018-04-28 | 2018-09-07 | 新辉开科技（深圳）有限公司 | The module and its manufacturing method of orientation bistable liquid crystal display electronic license plate |
| CN109683407A (en) * | 2019-02-22 | 2019-04-26 | 深圳市华星光电半导体显示技术有限公司 | Liquid crystal grating device and liquid crystal display device |
| CN110208990A (en) * | 2018-02-28 | 2019-09-06 | 江苏集萃智能液晶科技有限公司 | A kind of preparation method and bistable state light modulation device of bistable state light modulation device |
| CN114859583A (en) * | 2022-04-11 | 2022-08-05 | 汕头大学 | Device for optimizing performance of liquid crystal light-driven display sample and light adjusting method |
| CN114967241A (en) * | 2022-04-11 | 2022-08-30 | 汕头大学 | Preparation method of CD-ROM drive liquid crystal light modulator of multi-component composite system |
| CN117004408A (en) * | 2023-08-02 | 2023-11-07 | 重庆汉朗精工科技有限公司 | Liquid crystal composition and light modulation device thereof |
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| CN101718923A (en) * | 2009-12-07 | 2010-06-02 | 汕头大学 | Liquid crystal grating |
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| US6320639B1 (en) * | 1996-03-11 | 2001-11-20 | Canon Kabushiki Kaisha | Liquid crystal device and process for production thereof |
| CN1304495A (en) * | 1999-05-14 | 2001-07-18 | 皇家菲利浦电子有限公司 | Electro-optic display device with electrically insulating layers |
| CN101339308A (en) * | 2008-08-13 | 2009-01-07 | 合肥工业大学 | Multiple colour low-power consumption reflection-type liquid-crystal display device |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102866554B (en) * | 2012-10-10 | 2016-04-13 | 南京大学 | The Terahertz wave plate that a kind of wideband is adjustable |
| CN102866554A (en) * | 2012-10-10 | 2013-01-09 | 南京大学 | Broadband-adjustable terahertz wave plate |
| CN102967957A (en) * | 2012-11-21 | 2013-03-13 | 合肥工业大学 | Low-power-consumption electronic control liquid crystal light valve device capable of regulating transmittivity by self |
| CN103064226A (en) * | 2013-01-05 | 2013-04-24 | 东南大学 | Liquid crystal based electronically-controlled adjustable phase grating |
| CN104777651A (en) * | 2015-04-29 | 2015-07-15 | 厦门大学 | Polymerization method for cholesteric liquid crystal grating pattern |
| CN104777651B (en) * | 2015-04-29 | 2018-02-27 | 厦门大学 | A kind of cholesteric liquid crystal grating pattern polymerization |
| CN106444175A (en) * | 2016-09-28 | 2017-02-22 | 哈尔滨工程大学 | Phase type liquid crystal grating with electrically-controlled continuous tuning diffraction spot positions and manufacturing method of phase type liquid crystal grating |
| CN110208990A (en) * | 2018-02-28 | 2019-09-06 | 江苏集萃智能液晶科技有限公司 | A kind of preparation method and bistable state light modulation device of bistable state light modulation device |
| CN108508670B (en) * | 2018-04-28 | 2024-03-15 | 新辉开科技（深圳）有限公司 | Module of electronic license plate of azimuth bistable liquid crystal display and manufacturing method thereof |
| CN108508670A (en) * | 2018-04-28 | 2018-09-07 | 新辉开科技（深圳）有限公司 | The module and its manufacturing method of orientation bistable liquid crystal display electronic license plate |
| CN109683407A (en) * | 2019-02-22 | 2019-04-26 | 深圳市华星光电半导体显示技术有限公司 | Liquid crystal grating device and liquid crystal display device |
| WO2020168602A1 (en) * | 2019-02-22 | 2020-08-27 | 深圳市华星光电半导体显示技术有限公司 | Liquid crystal grating device and liquid crystal display device |
| CN114859583A (en) * | 2022-04-11 | 2022-08-05 | 汕头大学 | Device for optimizing performance of liquid crystal light-driven display sample and light adjusting method |
| CN114967241A (en) * | 2022-04-11 | 2022-08-30 | 汕头大学 | Preparation method of CD-ROM drive liquid crystal light modulator of multi-component composite system |
| CN114967241B (en) * | 2022-04-11 | 2023-06-09 | 汕头大学 | Preparation method of CD-ROM liquid crystal optical modulator of multicomponent composite system |
| CN114859583B (en) * | 2022-04-11 | 2023-12-12 | 汕头大学 | Device for optimizing performance of liquid crystal light-driven display sample and light adjustment method |
| CN117004408A (en) * | 2023-08-02 | 2023-11-07 | 重庆汉朗精工科技有限公司 | Liquid crystal composition and light modulation device thereof |
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Application publication date: 20120711 |