CN109709739A - A kind of short focus liquid crystal lens - Google Patents
A kind of short focus liquid crystal lens Download PDFInfo
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- CN109709739A CN109709739A CN201910202648.XA CN201910202648A CN109709739A CN 109709739 A CN109709739 A CN 109709739A CN 201910202648 A CN201910202648 A CN 201910202648A CN 109709739 A CN109709739 A CN 109709739A
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- public electrode
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Abstract
The present invention proposes a kind of short focus liquid crystal lens, it is made of top glass substrate, transparent flat public electrode, liquid crystal layer, high dielectric layer, central, transparent public electrode, low dielectric layer, transparent pixel electrode and lower glass substrate.Apply voltage on transparent pixel electrode, it is acted on by partial pressure of the low dielectric layer to center transparent common electrode both ends, high dielectric layer and central, transparent public electrode is cooperated to change the director distribution of liquid crystal molecule, lens centre and rims of the lens is set to generate biggish refringence, realize that short focus is adjustable, and liquid crystal layer inner refractive index is distributed the gradient shape being centrosymmetric, to obtain ideal parabola shaped phase distribution.Apply suitable voltage on transparent pixel electrode and make the biggish refringence of the acquisition of lens centre and rims of the lens liquid crystal molecule, generates shorter focal length.In addition, realizing the focal length for continuously adjusting the short focus liquid crystal lens by changing the voltage applied on transparent pixel electrode, the liquid crystal lens manufacture craft is simple and driving method is simple.
Description
Technical field
The present invention relates to liquid crystal lens field, specifically a kind of short focus liquid crystal lens.
Background technique
Liquid crystal lens have many advantages, such as tunability, low in energy consumption, light structure, can be applied to Three-dimensional Display, tunable optical
Sub- device, image procossing etc..
In order to realize the humorous liquid crystal lens of focus adjustable, needs to design reasonable electrode structure and obtain centrosymmetric gradient
Index distribution.For this purpose, experts and scholars propose the liquid crystal lens of a variety of different electrode structures, such as hole shape electrode structure, mostly electric
Pole structure, surface relief structure etc..The liquid crystal lens production of hole shape electrode structure is very simple, but causes since liquid crystal layer is thicker
The response time of liquid crystal is very slow；Multiple electrode structure is by applying the available parabola shaped phase of different voltage to each electrode
Bit distribution, but driving method is more complicated；Liquid crystal microlens with surface undulation profile embossment structure are easy in liquid crystal
Ideal index distribution is obtained in layer, however, the relief surface of each lens is difficult to be lithographically perfect spherical surface, in addition, for
The liquid crystal lens of inner surface out-of-flatness, the orientation of liquid crystal molecule unevenly cause the scattering to light.Therefore, the simplification of technique
And liquid crystal layer is lightening, while the liquid crystal lens for obtaining favorable optical performance are still a challenging task.
Summary of the invention
It is an object of the present invention to overcome the shortcomings of the prior art and provide a kind of manufacture crafts simply, driving side
Formula is simple and the short focus liquid crystal lens of function admirable.
The present invention is achieved by the following technical solutions:
The present invention includes top glass substrate, transparent flat public electrode, liquid crystal layer, high dielectric layer, central, transparent public electrode, low
Dielectric layer, transparent pixel electrode and lower glass substrate.
The liquid crystal layer is nematic liquid crystal, and thickness is thin and uniform, upper and lower oriented anti-parallel.
The high dielectric layer uses the transparent dielectric material of high-dielectric coefficient, and dielectric coefficient is used between 800~2000
In the smoothly phase distribution in liquid crystal layer；The low dielectric layer uses the transparent dielectric material compared with low-k, dielectric coefficient
Between 3~12, low dielectric layer is used to share the voltage on central, transparent public electrode both sides, makes to generate center pair inside liquid crystal layer
The graded index profile of title；The low dielectric layer is plated in the centre of transparent pixel electrode, and the thickness of high dielectric layer is greater than low
The thickness of dielectric layer.
The transparent flat public electrode, central, transparent public electrode and transparent pixel electrode are all made of tin indium oxide
(ITO) or the transparent conductive material such as indium zinc oxide (IZO)；The transparent flat public electrode and central, transparent public electrode connect
Ground applies voltage on transparent pixel electrode；Central, transparent public electrode is plated in the center on low dielectric layer surface, transparent flat
Face public electrode is plated in top glass substrate inner surface, and cooperation central, transparent public electrode keeps liquid above central, transparent public electrode
Brilliant molecule is horizontally directed to；The width of central, transparent public electrode is less than the width of transparent pixel electrode, transparent pixel electrode plating
In lower glass substrate and gap is identical；The thickness of transparent flat public electrode, central, transparent public electrode and transparent pixel electrode
It spends identical.
Short focus liquid crystal lens provided by the invention are by top glass substrate, transparent flat public electrode, liquid crystal layer, Gao Jie electricity
Layer, central, transparent public electrode, low dielectric layer, transparent pixel electrode and lower glass substrate are constituted, and manufacture craft is simple and drives
Flowing mode is simple.Apply voltage on transparent pixel electrode, by low dielectric layer to the partial pressure at center transparent common electrode both ends
Effect cooperates high dielectric layer and central, transparent public electrode to change the director distribution of liquid crystal molecule, makes lens centre and lens
Edge generates biggish refringence, realizes that short focus is adjustable, and liquid crystal layer inner refractive index is distributed the ladder being centrosymmetric
Shape is spent, to obtain ideal parabola shaped phase distribution.In addition, by changing the voltage applied on transparent pixel electrode come real
Now continuously adjust the focal length of the short focus liquid crystal lens.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the short focus liquid crystal lens of the embodiment of the present invention.
Fig. 2 is the refractive index distribution curve figure of the short focus liquid crystal lens of the embodiment of the present invention.
Fig. 3 is the phase distribution curve graph of the short focus liquid crystal lens single lens of the embodiment of the present invention.
Fig. 4 is voltage-focal length curve graph of the short focus liquid crystal lens of the embodiment of the present invention.
Shown by reference numeral in above-mentioned attached drawing are as follows:
1 top glass substrate, 2 transparent flat public electrodes, 3 liquid crystal layers, 4 high dielectric layers, 5 central, transparent public electrodes, 6 low dielectrics
Layer, 7 transparent pixel electrodes, 8 lower glass substrates.
Specific embodiment
To enable those skilled in the art to be further understood that the present invention, this hair is explained in detail below in conjunction with attached drawing
Bright specific embodiment.It should be noted that attached drawing is only for the purpose of description, and map not according to original size.
Attached drawing 1 is the structural schematic diagram of short focus liquid crystal lens provided in an embodiment of the present invention, which includes upper
Glass substrate, transparent flat public electrode, liquid crystal layer, high dielectric layer, central, transparent public electrode, low dielectric layer, transparent pixels
Electrode and lower glass substrate；Transparent flat public electrode, central, transparent public electrode and transparent pixel electrode are made of ITO,
Central, transparent public electrode is plated in the center on low dielectric layer surface, and transparent flat public electrode is plated in table in top glass substrate
Face, cooperation central, transparent public electrode keep being horizontally directed to for central, transparent public electrode top liquid crystal molecule, and central, transparent is public
The width of common electrode is less than the width of transparent pixel electrode, and transparent pixel electrode is plated in lower glass substrate and gap is identical, thoroughly
Bright plane public electrode, central, transparent public electrode are identical with the thickness of transparent pixel electrode；High dielectric layer is by high-dielectric coefficient
Transparent dielectric material be made, be mixed in a certain ratio and mix using vinyl fluoride-trifluoro-ethylene-chlorotrifluoroethylene and polyaniline
Miscellaneous production, low dielectric layer are made by the transparent dielectric material of low-k, are made of polyimides, and high dielectric layer is used
Phase distribution in smooth liquid crystal layer, low dielectric layer are used to share the voltage on central, transparent public electrode both sides, make liquid crystal layer
Inside generates centrosymmetric graded index profile；Liquid crystal layer uses nematic liquid crystal, and the thickness of liquid crystal layer is uniform；High dielectric
The frictional direction of layer surface perpendicular to central, transparent public electrode and transparent pixel electrode direction, coat one layer thin by top glass substrate
Polyimide alignment layers, and by high dielectric layer surface frictional direction carry out anti-parallel direction friction, make liquid crystal molecules parallel
Arrangement.Transparent flat public electrode and central, transparent public electrode ground connection, apply voltage on transparent pixel electrode.Pass through low Jie
Electric layer acts on the partial pressure at center transparent common electrode both ends, and high dielectric layer and central, transparent public electrode is cooperated to change liquid crystal point
The director distribution of son makes lens centre and rims of the lens generate biggish refringence, realizes that short focus is adjustable, and liquid crystal
Layer inner refractive index is distributed the gradient shape being centrosymmetric, to obtain ideal parabola shaped phase distribution.It is saturating by changing
The voltage applied on bright pixel electrode continuously adjusts the focal length of the short focus liquid crystal lens to realize.
The characterisitic parameter of liquid crystal material used in the present embodiment are as follows: the Refractive Index of Material of nematic liquid crystal is no=
1.517 ne=1.741；In wavelength X=550nm, being saturated birefringent is 0.224, dielectric coefficient 11.4.
D=35 μm of liquid crystal lens overall thickness in the present embodiment, the thickness d of liquid crystal layerLC=15 μm, the thickness d of high dielectric layer2
=20 μm, dielectric coefficient 1000, the thickness d of low dielectric layer1=6 μm, l=103 μm of width, dielectric coefficient 3.8, center is saturating
The width w of bright public electrode0=3 μm, w=5 μm of the width of transparent pixel electrode, the gap between transparent pixel electrode is short focus
Away from liquid crystal lens single lens region, g=113 μm of the gap of transparent pixel electrode, the i.e. each lens of short focus liquid crystal lens
R=56.5 μm of radius.
Attached drawing 2 is the refractive index distribution curve figure of the short focus liquid crystal lens of the embodiment of the present invention, and abscissa indicates lens
To the distance on lens both sides, abscissa origin is lens centre position, the voltage V=being applied on transparent pixel electrode at center
2.4Vrms.At this point, obtaining biggish refringence 0.1077 between lens centre and rims of the lens, it is centrosymmetric in liquid crystal layer
Index distribution and have it is good parabola shaped.
Attached drawing 3 is the phase distribution figure of the short focus liquid crystal lens of the embodiment of the present invention, and abscissa indicates that lens centre is arrived
The distance on lens both sides, abscissa origin are lens centre position, the voltage V=2.4V being applied on transparent pixel electroderms。
Dotted line indicates that polarization direction is parallel to the phase distribution curve of the incident polarized light of liquid crystal molecule optical axis, and solid line indicates perfect lens
Parabola.Particularly, enabling the phase at liquid crystal lens center is zero, and the phase difference between lens centre and rims of the lens is
5.87 π, and the phase distribution of incident polarized light matches preferably with ideal parabolic, helps to reduce spherical aberration, improves lens
Image quality.
Attached drawing 4 is focal length-voltage curve of the short focus liquid crystal lens of the embodiment of the present invention.When being applied to transparent pixels
The voltage of electrode is from 0VrmsIncrease to 2.4VrmsWhen, the refringence of lens centre and rims of the lens is increasing, the coke of lens
Away from 0.988mm can be continuously adjusted to from infinity.
The above description is only a preferred embodiment of the present invention, however, the present invention is not limited thereto embodiment.The common skill of this field
Art personnel should be appreciated that in the case where not departing from the spirit and scope of the present invention being defined by the claims to its shape
The various changes that formula and details are made should all belong in the scope of the present invention.
Claims (4)
1. a kind of short focus liquid crystal lens, it is characterized in that, the liquid crystal lens are by top glass substrate, transparent flat public electrode, liquid
Crystal layer, high dielectric layer, central, transparent public electrode, low dielectric layer, transparent pixel electrode and lower glass substrate are constituted.
2. short focus liquid crystal lens according to claim 1, it is characterized in that, the high dielectric layer is using high-dielectric coefficient
Transparent dielectric material, low dielectric layer use the transparent dielectric material compared with low-k, and low dielectric layer is plated in transparent pixel electrode
Centre, the thickness of high dielectric layer is greater than the thickness of low dielectric layer, and central, transparent public electrode is plated in low dielectric layer surface
Heart position.
3. short focus liquid crystal lens according to claim 1, it is characterized in that, the transparent flat public electrode and center are saturating
Bright public electrode ground connection, applies voltage on transparent pixel electrode.
4. short focus liquid crystal lens according to claim 1, it is characterized in that, the width of the central, transparent public electrode
Less than the width of transparent pixel electrode.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910202648.XA CN109709739B (en) | 2019-03-18 | 2019-03-18 | Short-focus liquid crystal lens |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910202648.XA CN109709739B (en) | 2019-03-18 | 2019-03-18 | Short-focus liquid crystal lens |
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| CN109709739A true CN109709739A (en) | 2019-05-03 |
| CN109709739B CN109709739B (en) | 2021-12-07 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110579921A (en) * | 2019-08-23 | 2019-12-17 | 北京航空航天大学 | Isotropic liquid crystal lens array based on resistance layer |
| CN113514974A (en) * | 2021-04-19 | 2021-10-19 | 南昌虚拟现实研究院股份有限公司 | Liquid crystal lens zooming processing method and system |
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| US20070229754A1 (en) * | 2006-03-03 | 2007-10-04 | Universite Laval | Method and apparatus for spatially modulated electric field generation and electro-optical tuning using liquid crystals |
| US20150036096A1 (en) * | 2012-03-19 | 2015-02-05 | Nippon Electric Glass Co., Ltd. | Liquid-crystal lens |
| CN106249448A (en) * | 2016-08-11 | 2016-12-21 | 四川大学 | A kind of blue phase liquid crystal lens |
| CN107357110A (en) * | 2017-08-19 | 2017-11-17 | 四川大学 | A kind of heavy caliber liquid crystal lens array using composite dielectric layer |
| CN107436499A (en) * | 2017-07-31 | 2017-12-05 | 四川大学 | A kind of blue phase liquid crystal post lens |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20070229754A1 (en) * | 2006-03-03 | 2007-10-04 | Universite Laval | Method and apparatus for spatially modulated electric field generation and electro-optical tuning using liquid crystals |
| US20150036096A1 (en) * | 2012-03-19 | 2015-02-05 | Nippon Electric Glass Co., Ltd. | Liquid-crystal lens |
| CN106249448A (en) * | 2016-08-11 | 2016-12-21 | 四川大学 | A kind of blue phase liquid crystal lens |
| CN107436499A (en) * | 2017-07-31 | 2017-12-05 | 四川大学 | A kind of blue phase liquid crystal post lens |
| CN107357110A (en) * | 2017-08-19 | 2017-11-17 | 四川大学 | A kind of heavy caliber liquid crystal lens array using composite dielectric layer |
| CN108572473A (en) * | 2018-04-10 | 2018-09-25 | 四川大学 | A kind of double dielectric layer blue phase liquid crystal lens arrays |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110579921A (en) * | 2019-08-23 | 2019-12-17 | 北京航空航天大学 | Isotropic liquid crystal lens array based on resistance layer |
| CN113514974A (en) * | 2021-04-19 | 2021-10-19 | 南昌虚拟现实研究院股份有限公司 | Liquid crystal lens zooming processing method and system |
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| CN109709739B (en) | 2021-12-07 |
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