CN108761884B - Blue phase liquid crystal lens with large focusing range - Google Patents

Blue phase liquid crystal lens with large focusing range Download PDF

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Publication number
CN108761884B
CN108761884B CN201810874435.7A CN201810874435A CN108761884B CN 108761884 B CN108761884 B CN 108761884B CN 201810874435 A CN201810874435 A CN 201810874435A CN 108761884 B CN108761884 B CN 108761884B
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China
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liquid crystal
blue phase
phase liquid
crystal lens
lens
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CN201810874435.7A
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CN108761884A (en
Inventor
王琼华
窦虎
储繁
田莉兰
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Sichuan University
Beijing University of Aeronautics and Astronautics
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Sichuan University
Beijing University of Aeronautics and Astronautics
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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/13306—Circuit arrangements or driving methods for the control of single liquid crystal cells
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/133345—Insulating layers
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1343—Electrodes
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/137—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/133302—Rigid substrates, e.g. inorganic substrates
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/137—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
    • G02F1/13793—Blue phases

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mathematical Physics (AREA)
  • Liquid Crystal (AREA)

Abstract

The invention provides a blue phase liquid crystal lens with a large focusing range. The structure of the blue phase liquid crystal lens is sequentially from top to bottom: positive glass lens, upper substrate, pixel electrode, upper dielectric layer, opening electrode, lower dielectric layer, liquid crystal layer, insulating layer, common electrode and lower substrate. The upper substrate and the lower substrate are flat glass substrates. The pixel electrode and the common electrode are planar electrodes; the upper dielectric layer and the lower dielectric layer are made of the same high dielectric material; the maximum phase difference provided by the blue phase liquid crystal lens can break through 1/3 saturation induced birefringence limitation of the refractive index difference of the blue phase liquid crystal material, the minimum focal length of the blue phase liquid crystal lens is reduced by about 1 time, and the focusing range of the blue phase liquid crystal lens is increased to a large extent.

Description

Blue phase liquid crystal lens with large focusing range
Technical Field
The invention relates to the field of liquid crystal lenses, in particular to a blue phase liquid crystal lens with a large focusing range.
Background
A liquid crystal lens is an optical device with a variable refractive index profile. Compared with the common lens which realizes zooming through mechanical movement, the liquid crystal lens can realize zooming through the adjustment of an external electric field, so the liquid crystal lens has the advantages of small volume, light weight, high integration level and the like. With the improvement of manufacturing process technology, in recent years, liquid crystal lenses gradually show important application values in the fields of adaptive optics, optical communication, photoelectric storage, three-dimensional display and the like.
The liquid crystal lens adopting the blue phase liquid crystal material has more advantages than the common liquid crystal lens: the response speed is higher; orientation of blue phase liquid crystal molecules is not needed, so that the manufacturing process and cost are simplified; and can be used to make polarization independent liquid crystal lenses. However, the blue phase liquid crystal lens has a disadvantage of small focal length adjustment range because the maximum refractive index difference provided by the blue phase liquid crystal lens is only one third of the maximum refractive index difference of the corresponding nematic phase liquid crystal lens. This seriously hinders the development of blue phase liquid crystal lenses.
Disclosure of Invention
The invention provides a blue phase liquid crystal lens with a large focusing range, as shown in the attached figure 1, the structure of the blue phase liquid crystal lens is as follows in sequence from top to bottom: positive glass lens, upper substrate, pixel electrode, upper dielectric layer, opening electrode, lower dielectric layer, liquid crystal layer, insulating layer, common electrode and lower substrate.
The upper substrate and the lower substrate are both flat glass substrates.
The pixel electrode, the opening electrode and the common electrode are transparent electrodes, and the thickness of the electrodes is 0.08-0.12 mu m; the pixel electrode and the common electrode are planar electrodes, and the diameter of an opening of the opening electrode is 80-120 mu m.
The upper dielectric layer and the lower dielectric layer are made of the same high-dielectric material, the dielectric constant of the high-dielectric material is 280-330, and the dielectric constant of the insulating layer is 2-6; the thickness of the upper dielectric layer is 3-5 μm, the thickness of the lower dielectric layer is 20-30 μm, and the thickness of the insulating layer is 0.08-0.12 μm.
The liquid crystal layer is made of a blue phase liquid crystal material, and the thickness of the liquid crystal layer is 8-12 mu m.
The function and the realization mode of the invention are as follows: when the blue phase liquid crystal lens is in a driving mode of a negative blue phase liquid crystal lens, an electric field at the central part in the liquid crystal layer is higher than an electric field at the edge part, a blue phase liquid crystal layer with negative lens refractive index distribution can be obtained, if the focal length reaches the minimum, the diffusion effect of the blue phase liquid crystal layer with negative lens refractive index distribution on the light wave and the convergence effect of the positive glass lens on the light wave are offset, and the whole positive lens has the focal length of infinity; when the blue phase liquid crystal lens is in a driving mode of a negative blue phase liquid crystal lens and the focal length does not reach the minimum, the blue phase liquid crystal layer with the negative lens refractive index distribution has a smaller diffusion effect on light waves than a positive glass lens, and the whole lens is a positive lens; when the blue phase liquid crystal lens is in a driving mode of the positive blue phase liquid crystal lens, the electric field of the edge part in the liquid crystal layer is higher than that of the central part, the blue phase liquid crystal layer with the positive lens refractive index distribution can be obtained, the convergence effect of the blue phase liquid crystal layer with the positive lens refractive index distribution on the light wave is superposed with the convergence effect of the positive glass lens on the light wave, and the whole positive lens is represented as a positive lens with a smaller focal length.
The size of the focal length of the lens is adjusted by controlling the voltage between the pixel electrode or the opening electrode and the common electrode.
Compared with the prior art, the invention has the beneficial effects that: under the same material parameters, the maximum phase difference provided by the blue phase liquid crystal lens with the large focusing range can break through the 1/3 saturation induced birefringence limit of the refractive index difference of the blue phase liquid crystal material, and is improved by about 1 time compared with the maximum phase difference provided by the corresponding blue phase liquid crystal lens; the minimum focal length of the blue phase liquid crystal lens with the large focusing range is about 0.5 times of the minimum focal length of the blue phase liquid crystal lens with the same parameters, and the focusing range of the blue phase liquid crystal lens is greatly improved.
The following description with reference to the drawings and examples is intended to explain the present invention in detail, not to set the scope of the invention.
Drawings
Fig. 1 is a schematic structural diagram of a blue phase liquid crystal lens with a large focusing range according to an embodiment.
Fig. 2 is a driving schematic diagram of a refractive index distribution of a positive lens in a liquid crystal layer in a blue phase liquid crystal lens with a large focusing range according to an embodiment.
Fig. 3 is a driving schematic diagram of a negative lens refractive index distribution of a liquid crystal layer in a blue phase liquid crystal lens with a large focusing range according to an embodiment.
Fig. 4 is a top view of refractive index distribution in a liquid crystal layer when the liquid crystal layer of the blue phase liquid crystal lens with a large focusing range is driven by a positive refractive index distribution according to the embodiment.
Fig. 5 is a top view of refractive index distribution in a liquid crystal layer when the liquid crystal layer is driven by a negative refractive index distribution in a blue phase liquid crystal lens with a large focusing range according to an embodiment.
Fig. 6 is a phase difference distribution diagram of a blue phase liquid crystal lens with a large focusing range under different driving voltages according to an embodiment.
Fig. 7 is a voltage-focal length graph of a blue phase liquid crystal lens and a corresponding general lens according to an embodiment.
Detailed Description
The invention provides a blue phase liquid crystal lens with a large focusing range, as shown in fig. 1, the blue phase liquid crystal lens sequentially comprises the following components from top to bottom: positive glass lens 1, upper substrate 2, pixel electrode 3, upper dielectric layer 4, opening electrode 5, lower dielectric layer 6, liquid crystal layer 7, insulating layer 8, common electrode 9 and lower substrate 10.
Description of the embodiments
The positive glass lens of the present invention is formed by forming a smooth surface type protrusion on the upper surface of the upper substrate 2 using a photolithography material and using photolithography and high-temperature baking.
The pixel electrode 3, the opening electrode 5 and the common electrode 9 in the present invention use Indium Tin Oxide (ITO).
The hole-opening electrode 5 of the present invention needs to be aligned with the positive glass lens strictly during the manufacturing process.
The thickness of the upper dielectric layer 4 in the invention is 5 μm, the high dielectric material is adopted, and the dielectric constant is 300; the thickness of the lower dielectric layer 6 is 25 μm, a high dielectric material is adopted, and the dielectric constant is 300; the insulating layer 8 was 0.1 μm thick, made of a polyimide material, and had a dielectric constant of 3.8. The upper dielectric layer 4 and the lower dielectric layer 6 mainly play a role in homogenizing electric field distribution in the blue phase liquid crystal layer, so that the phase difference distribution of the blue phase liquid crystal layer after being driven is closer to that of an ideal lens; the insulating layer 8 mainly functions to isolate the electrodes from the blue phase liquid crystal layer, so that the blue phase liquid crystal material is more stable.
The parameters of the blue phase liquid crystal material adopted by the invention are that n e is 1.6494, n o is 1.4794, K is 13.7nm/V 2, E s is 2.2V/mum, and (delta n) s is 0.17, and the thickness of the liquid crystal layer is 10 μm.
The function and the realization mode of the invention are as follows: when the blue phase liquid crystal lens is in a driving mode of a negative blue phase liquid crystal lens, an electric field at the central part in the liquid crystal layer is higher than an electric field at the edge part, a blue phase liquid crystal layer with negative lens refractive index distribution can be obtained, if the focal length reaches the minimum, the diffusion effect of the blue phase liquid crystal layer with negative lens refractive index distribution on the light wave and the convergence effect of the positive glass lens on the light wave are offset, and the whole positive lens has the focal length of infinity; when the blue phase liquid crystal lens is in a driving mode of a negative blue phase liquid crystal lens and the focal length does not reach the minimum, the blue phase liquid crystal layer with the negative lens refractive index distribution has a smaller diffusion effect on light waves than a positive glass lens, and the whole lens is a positive lens; when the blue phase liquid crystal lens is in a driving mode of the positive blue phase liquid crystal lens, the electric field of the edge part in the liquid crystal layer is higher than that of the central part, the blue phase liquid crystal layer with the positive lens refractive index distribution can be obtained, the convergence effect of the blue phase liquid crystal layer with the positive lens refractive index distribution on the light wave is superposed with the convergence effect of the positive glass lens on the light wave, and the whole positive lens is represented as a positive lens with a smaller focal length.
The above description is only one embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications or parameter optimization can be made without departing from the principle of the present invention, and these modifications and parameter optimization should also be regarded as the protection scope of the present invention.

Claims (7)

1. A blue phase liquid crystal lens device with a large focusing range comprises the following components in sequence from top to bottom: the liquid crystal display panel comprises a positive glass lens (1), an upper substrate (2), a pixel electrode (3), an upper dielectric layer (4), an opening electrode (5), a lower dielectric layer (6), a liquid crystal layer (7), an insulating layer (8), a common electrode (9) and a lower substrate (10).
2. A blue phase liquid crystal lens device with a large focusing range according to claim 1, wherein said upper substrate (2) and said lower substrate (10) are flat glass substrates.
3. A large focusing range blue phase liquid crystal lens device according to claim 1, wherein said pixel electrode (3), said opening electrode (5) and said common electrode (9) are transparent electrodes.
4. A large focusing range blue phase liquid crystal lens device as claimed in claim 1, wherein said upper dielectric layer (4) and said lower dielectric layer (6) are made of the same high dielectric material.
5. A large focusing range blue phase liquid crystal lens device as claimed in claim 1, characterized in that said liquid crystal layer (7) uses blue phase liquid crystal material.
6. A large focusing range blue phase liquid crystal lens device according to claim 1, characterized in that the refractive index distribution in said liquid crystal layer (7) is changed by changing the driving method to realize the switching between the positive lens refractive index distribution and the negative lens refractive index distribution.
7. A blue phase liquid crystal lens device with large focusing range according to claim 1, wherein the focal length of the blue phase liquid crystal lens is controlled by controlling the voltage difference between the pixel electrode (3) or the opening electrode (5) and the common electrode (9).
CN201810874435.7A 2018-08-03 2018-08-03 Blue phase liquid crystal lens with large focusing range Active CN108761884B (en)

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Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5359829B2 (en) * 2009-12-03 2013-12-04 カシオ計算機株式会社 Liquid crystal lenses and variable focal length glasses using them
CN102902129B (en) * 2012-11-14 2016-09-14 中航华东光电有限公司 A kind of liquid crystal lens
CN103235462B (en) * 2013-05-06 2015-09-30 中航华东光电有限公司 Liquid crystal lens and driving method, 3 d display device when carrying out 3D display
CN103616787B (en) * 2013-12-04 2017-05-17 中航华东光电有限公司 Liquid crystal lens and stereo display device with same
CN104317133A (en) * 2014-11-12 2015-01-28 京东方科技集团股份有限公司 Liquid crystal lens and display device

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