CN113777901A - Liquid crystal thin film device doped with organic small molecule donor material and display device - Google Patents
Liquid crystal thin film device doped with organic small molecule donor material and display device Download PDFInfo
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- CN113777901A CN113777901A CN202111048640.6A CN202111048640A CN113777901A CN 113777901 A CN113777901 A CN 113777901A CN 202111048640 A CN202111048640 A CN 202111048640A CN 113777901 A CN113777901 A CN 113777901A
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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 93
- 239000000463 material Substances 0.000 title claims abstract description 58
- 150000003384 small molecules Chemical class 0.000 title claims abstract description 38
- 239000010409 thin film Substances 0.000 title claims abstract description 32
- 239000002019 doping agent Substances 0.000 claims abstract description 13
- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical compound [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000004988 Nematic liquid crystal Substances 0.000 claims description 4
- 239000004986 Cholesteric liquid crystals (ChLC) Substances 0.000 claims description 3
- 239000004990 Smectic liquid crystal Substances 0.000 claims description 3
- CRUIOQJBPNKOJG-UHFFFAOYSA-N thieno[3,2-e][1]benzothiole Chemical compound C1=C2SC=CC2=C2C=CSC2=C1 CRUIOQJBPNKOJG-UHFFFAOYSA-N 0.000 abstract description 6
- 238000000034 method Methods 0.000 abstract description 3
- ODHXBMXNKOYIBV-UHFFFAOYSA-N triphenylamine Chemical compound C1=CC=CC=C1N(C=1C=CC=CC=1)C1=CC=CC=C1 ODHXBMXNKOYIBV-UHFFFAOYSA-N 0.000 abstract description 2
- 239000010408 film Substances 0.000 description 15
- 230000003287 optical effect Effects 0.000 description 9
- 238000001093 holography Methods 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 229920000642 polymer Polymers 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000003384 imaging method Methods 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 101100459910 Arabidopsis thaliana NCS1 gene Proteins 0.000 description 1
- -1 BSFTR Chemical compound 0.000 description 1
- 241001323321 Pluto Species 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000010365 information processing Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 238000001454 recorded image Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Images
Classifications
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
- G03H1/04—Processes or apparatus for producing holograms
- G03H1/0402—Recording geometries or arrangements
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
- G03H1/02—Details of features involved during the holographic process; Replication of holograms without interference recording
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
- G03H1/02—Details of features involved during the holographic process; Replication of holograms without interference recording
- G03H2001/0208—Individual components other than the hologram
- G03H2001/0228—Electro-optic or electronic components relating to digital holography
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
- G03H1/02—Details of features involved during the holographic process; Replication of holograms without interference recording
- G03H2001/026—Recording materials or recording processes
- G03H2001/0264—Organic recording material
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
- G03H1/04—Processes or apparatus for producing holograms
- G03H1/0402—Recording geometries or arrangements
- G03H2001/0439—Recording geometries or arrangements for recording Holographic Optical Element [HOE]
Abstract
The application provides a liquid crystal thin film device doped with an organic small molecule donor material, which comprises a host liquid crystal and a dopant, wherein the dopant is doped in the host liquid crystal, specifically, the material of the dopant is an organic small molecule donor material B1, and can also comprise other organic small molecule donor materials such as BDT benzodithiophene, DTF dithiofulvalene, TPA triphenylamine and the like. The liquid crystal display panel further comprises an indium tin oxide layer and a liquid crystal alignment layer, wherein the liquid crystal alignment layer is arranged on the outer layer of the main body liquid crystal, and the indium tin oxide layer is arranged on the outer layer of the liquid crystal alignment layer. The application also provides a liquid crystal thin film device display device based on the doped organic small molecule donor material, which comprises the liquid crystal thin film device doped with the organic small molecule donor material. According to the technical scheme, the problem of complex computing resources required in the implementation process can be solved, the resolution is improved, the field angle is widened, the response speed of the dynamic holographic material is optimized and improved, and the display frame rate is improved.
Description
Technical Field
The invention belongs to the field of optical holography, and particularly relates to a liquid crystal thin film device doped with an organic small molecule donor material and an optical dynamic holographic display device thereof.
Background
Holographic display technology uses complex amplitude interference and diffraction to record and reconstruct the original light field of an object, so that the most real 3D effect can be presented, and the holographic display technology is regarded as a very promising true three-dimensional display technology. Among them, static holography is widely used in many fields such as storage, anti-counterfeiting and optical information processing, and the realization and application of dynamic holography are still in the research stage.
The technologies for implementing dynamic holography are mainly divided into two types, the first type is a computer-generated holography technology, and holographic imaging is implemented by loading a hologram generated by calculation on an electro-optical device such as a spatial light modulator or a digital micro-mirror to modulate the amplitude and the phase of a light source. The modulation function of the device is completed by unit pixels, and the single pixel size of the electro-optical modulation devices produced on the market at present is far larger than the wavelength order, so that the holographic display realized in the way has the problems of low resolution and narrow viewing angle; from the perspective of a software algorithm, the time required for generating a hologram by using a GS iterative algorithm is greatly increased due to the improvement of the display frame rate and the resolution, and the requirement for computing resources is greatly increased, so that the display effect of practical application is poor, which is also the reason that the computing holographic technology is difficult to break through. Another type is optical holography, which is based on dynamic holographic materials, such as photorefractive polymers, photochromic polymers and doped liquid crystals. The technology utilizes the direct interference of object light and reference light on a dynamic holographic material to generate a holographic grating. Optical holography can reduce or avoid the problems of pixel size to a large extent because it does not rely entirely on electro-optic modulation devices. Furthermore, there is no need for computationally generated holograms in this technique, which translates the limitations of display frame rate from software algorithms and computational resources to performance requirements on the response speed of dynamic holographic materials. In addition to the response speed, the characteristics of the material itself also affect other properties such as diffraction efficiency and photorefractive sensitivity.
Currently, the main used dynamic holographic materials are: the photorefractive polymer and the photochromic polymer are doped with liquid crystal. According to the research reports at home and abroad, the response time of the two materials as main body devices is long, the holographic grating cannot be rapidly recorded and refreshed, and rapid image recording and rewriting are difficult to realize, so that main body device materials for realizing optical dynamic holography are yet to be developed.
The organic small molecular material is different from a polymer material, has the advantages of definite structure, easiness in adjustment and the like, is excellent in photoelectric property on the basis, and has great potential in semiconductor photovoltaic application. The doped liquid crystal film is doped into liquid crystal, so that the photorefractive sensitivity of the doped liquid crystal film can be greatly improved, the diffraction efficiency of the whole device in dynamic holographic reality is improved, and the response speed is accelerated. Therefore, those skilled in the art are motivated to develop a liquid crystal thin film device and a display device doped with organic small molecule donor material.
Disclosure of Invention
In order to achieve the above object, the present application provides a liquid crystal thin film device doped with an organic small molecule donor material, comprising a host liquid crystal and a dopant, wherein the dopant is doped in the host liquid crystal material, and the material of the dopant is organic small molecule donor material B1.
Further, the doping weight proportion of the dopant is 0.02% -2%.
Further, the material of the host liquid crystal is one of nematic liquid crystal, smectic liquid crystal or cholesteric liquid crystal.
The liquid crystal display panel further comprises an indium tin oxide layer and a liquid crystal alignment layer, wherein the liquid crystal alignment layer is arranged on the outer layer of the main body liquid crystal, and the indium tin oxide layer is arranged on the outer layer of the liquid crystal alignment layer.
Further, the liquid crystal of the liquid crystal alignment layer is aligned in a parallel direction, an anti-parallel direction, or a perpendicular direction.
Further, the thickness of the liquid crystal thin film device is 10-50 microns.
Further, a liquid crystal thin film device comprising a doped organic small molecule donor material according to claim 6, further comprising two lasers, wherein the first laser emits laser light as a recording beam and the second laser emits laser light as a reading beam.
Further, it is characterized by comprising a beam splitter prism that splits the recording beam into an object beam and a reference beam.
Further, the object beam, the reference beam and the reading beam are all incident on the organic small molecule donor material doped liquid crystal thin film device.
The object beam and the reference beam interfere on the liquid crystal thin film device doped with the organic small molecule donor material to form a holographic grating, and the reading beam reads image information recorded by the holographic grating in real time.
Compared with the prior art, the technical scheme of the application has at least the following advantages:
1. the hologram is generated without depending on calculation, and the limitation of a complex iterative generation algorithm on the display frame rate is solved.
2. The display medium is converted from the spatial light modulator into the doped liquid crystal film, so that the influence of low resolution and small field angle caused by the problem of hardware pixel size is reduced.
3. The liquid crystal thin film device is realized by adopting doped organic micromolecule donor material liquid crystal as a photorefractive material, and the material has excellent photoelectric property, so that the prepared thin film device has high photorefractive sensitivity and high response speed, and the frame rate of optical dynamic holographic display can be greatly improved.
The conception, specific structure and technical effects of the present application will be further described in conjunction with the accompanying drawings to fully understand the purpose, characteristics and effects of the present application.
Drawings
FIG. 1 is a schematic structural diagram of one embodiment of the present application;
FIG. 2 is a schematic structural diagram of a display device according to an embodiment of the present application;
FIG. 3 is a molecular structure diagram of an organic small molecule donor material containing a central unit of phenyl substituted Benzoxaphene (BDT) according to one embodiment of the present application.
Detailed Description
The technical contents of the preferred embodiments of the present application will be more clearly and easily understood by referring to the drawings attached to the specification. The present application may be embodied in many different forms of embodiments and the scope of the present application is not limited to only the embodiments set forth herein.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
In the description of the present application, it is to be understood that the terms "center", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present application and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present application.
The embodiment provides a liquid crystal thin film device doped with an organic small molecule donor material, and the specific structure is as shown in fig. 1, and includes two indium tin oxide layers 151, two liquid crystal alignment layers 152, and a bulk liquid crystal 153. The liquid crystal alignment layer 152 is disposed on the outer layer of the bulk liquid crystal 153, and the ITO layer 151 is disposed on the outer layer of the liquid crystal alignment layer 152. The host liquid crystal 153 is doped with an organic small molecule donor material having good photoelectric properties and a fast response speed as the dopant 154. The doping weight proportion of the dopant 154 is 0.02 to 2 percent; the material of the host liquid crystal 153 can be selected from one of nematic liquid crystal, smectic liquid crystal or cholesteric liquid crystal; the liquid crystal alignment of the liquid crystal alignment layer 152 can be selected to be parallel, anti-parallel or perpendicular; the thickness of the whole liquid crystal thin film device is 10-50 microns. In this embodiment, the doped organic small molecule donor material is preferably B1, which contains a central unit of phenyl-substituted Benzodithiophene (BDT), and its molecular structure is shown in fig. 3. The doping concentration was 0.05 wt.%. The bulk liquid crystal 153 is nematic liquid crystal 5CB, the liquid crystal film thickness is 20 μm, and the liquid crystal alignment of the liquid crystal alignment layer 152 is antiparallel. In other similar embodiments, the doped organic small molecule donor material may also include BDT benzodithiophene, DTF dithiofulvalene, TPA triphenylamine, BSFTR, ZR1, BTEC-2F, and other organic small molecule donor materials.
The optical dynamic holographic display device including the liquid crystal film based on doped organic small molecule donor material of the present embodiment has a general structure as shown in fig. 2, and includes two lasers 1 and 2 with different wavelengths, two half- wave plates 3 and 4, three polarizing plates 5, 6 and 7, a beam splitter 8, a beam expander 9, a reflective liquid crystal spatial light modulator 10, three reflecting mirrors 11, 12 and 13, a lens 14, a doped liquid crystal film 15, a computer 16 and a dc stabilized power supply 17. Two lasers 1 and 2 are fixed on the platform, wherein the laser 1 is used as a recording light source, and the laser 2 is used as a reading light source; a half-wave plate 3 and a polaroid 5 are arranged behind the laser 1, and a half-wave plate 4 and a polaroid 6 are arranged behind the laser 2; the beam splitter prism 8 is arranged behind the polaroid 5 and divides the light beam into an object beam and a reference beam; the reflecting mirror 11 is arranged behind the beam splitter prism 8, the beam expander 9 is arranged behind the reflecting mirror 11, the reflective spatial light modulator 10 is arranged between the beam expander 9 and the reflecting mirror 12, and the lens 14 and the polaroid 7 are arranged behind the reflecting mirror 12; the mirror 13 is placed behind the laser 2; the reflective spatial light modulator 10 is connected with a computer 16; the doped liquid crystal film 15 is connected with a direct current stabilized power supply 17 through a lead.
In this embodiment, the laser 1 is a blue laser having a wavelength of 457nm, and the laser 2 is a green laser having a wavelength of 532 nm.
In the present embodiment, the reflective liquid crystal spatial light modulator 10 is a PLUTO amplitude type reflective liquid crystal spatial light modulator manufactured by HOLOEYE corporation.
The use method of the optical dynamic holographic display device based on the liquid crystal film doped with the organic small molecule donor material comprises the following specific operation steps:
an experimental system is set up, laser beams emitted from the lasers 1 and 2 are converted into horizontal polarized light after passing through half- wave plates 3 and 4, and polarizing plates 5 and 6 are set to be horizontal polarization angles for filtering stray light; a laser beam serving as a recording light source is divided into an object beam and a reference beam through a beam splitter prism 8, the object beam enters a beam expander 9 through a reflector 11 and then enters a reflective liquid crystal spatial light modulator 10, the object beam is modulated and then reflected to a reflector 12, the reflector 12 adjusts the beam to a lens 14, the beam is focused on a liquid crystal film 15, and the amplitude type spatial light modulator needs to filter the modulated light through a polaroid 7 so as to realize final imaging; the reference beam directly enters the doped liquid crystal film 15 and is superposed and interfered with the object beam to generate a holographic grating; a proper direct current voltage is loaded on the doped liquid crystal film 15 by a direct current stabilized voltage supply 17 to assist in driving liquid crystal to deflect so as to generate a holographic grating with a modulated refractive index; the positions of the light path and the device are adjusted to ensure that a certain inclination angle is formed between the incident directions of the object beam and the reference beam and the normal of the liquid crystal film, about 45 degrees, so as to meet the photorefractive effect and ensure the imaging efficiency and response speed.
The computer 16 loads the video image to be displayed on the reflective spatial light modulator 10, the object beam is modulated to carry the video image information of each frame and then interferes with the reference beam, and the recorded image is repeatedly refreshed in the liquid crystal film by utilizing the photorefractive effect of the doped material, so that the dynamic holographic grating is generated. The response time of the organic small molecule donor material-doped liquid crystal film can reach 5ms at the fastest, namely, the refreshing speed of the holographic grating can meet the recording of video images at 60Hz and above. While video image information is recorded, the formed dynamic hologram grating is read by a laser beam emitted from the laser 2, and a dynamic hologram image can be obtained on the back surface of the doped liquid crystal film 15.
The frame rate of the dynamic holographic display depends on the response speed of the spatial light modulator and the liquid crystal thin film device doped with the organic small molecule donor material. In this embodiment, the maximum refresh rate supported by the reflective spatial light modulator used is 60Hz, and the response speed of the liquid crystal thin film device doped with the small organic molecule donor material B1 can satisfy the requirement that the display frame rate is above 60 Hz. Therefore, the invention can realize high frame rate dynamic holographic display, and the display frame rate can reach 60Hz or above without considering the limit of the spatial light modulator.
The foregoing detailed description of the preferred embodiments of the present application. It should be understood that numerous modifications and variations can be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the concepts of the present application should be within the scope of protection defined by the claims.
Claims (10)
1. A liquid crystal thin film device doped with an organic small molecule donor material comprises a host liquid crystal and a dopant, wherein the dopant is doped in the host liquid crystal, and the material of the dopant is organic small molecule donor material B1.
2. The organic small molecule donor material doped liquid crystal thin film device of claim 1, wherein the dopant is doped in a proportion of 0.02% to 2% by weight.
3. The organic small molecule donor material doped liquid crystal thin film device of claim 2, wherein the material of the host liquid crystal is one of nematic liquid crystal, smectic liquid crystal or cholesteric liquid crystal.
4. The organic small molecule donor material doped liquid crystal thin film device of claim 3, comprising an indium tin oxide layer and a liquid crystal alignment layer, wherein the liquid crystal alignment layer is disposed on the bulk liquid crystal outer layer, and wherein the indium tin oxide layer is disposed on the liquid crystal alignment layer outer layer.
5. The organic small molecule donor material doped liquid crystal thin film device of claim 4, wherein the liquid crystal alignment of the liquid crystal alignment layer is parallel, anti-parallel or perpendicular.
6. The organic small molecule donor material doped liquid crystal thin film device of claim 5, wherein the thickness of the liquid crystal thin film device is between 10 microns and 50 microns.
7. A liquid crystal thin film device display apparatus based on doped organic small molecule donor material, comprising the organic small molecule donor material doped liquid crystal thin film device of claim 6, further comprising two lasers, wherein the first laser emits a light beam as a recording light beam and the second laser emits a light beam as a reading light beam.
8. The liquid crystal thin film device display apparatus based on doped organic small molecule donor material of claim 7, comprising a beam splitter prism that splits the recording beam into an object beam and a reference beam.
9. The doped organic small molecule donor material-based liquid crystal thin film device display apparatus of claim 8, wherein the object beam, the reference beam, and the readout beam are incident on the doped organic small molecule donor material-based liquid crystal thin film device.
10. The organic small molecule donor material doped based liquid crystal thin film device display apparatus of claim 9, wherein the object beam and the reference beam interfere to form a holographic grating on the organic small molecule donor material doped liquid crystal thin film device, and the reading beam reads image information recorded by the holographic grating in real time.
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Application publication date: 20211210 |