CN110275363A - A kind of low aberrations mode electrode liquid crystal lens - Google Patents
A kind of low aberrations mode electrode liquid crystal lens Download PDFInfo
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- CN110275363A CN110275363A CN201910540493.0A CN201910540493A CN110275363A CN 110275363 A CN110275363 A CN 110275363A CN 201910540493 A CN201910540493 A CN 201910540493A CN 110275363 A CN110275363 A CN 110275363A
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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
- G02F1/1343—Electrodes
- G02F1/134309—Electrodes characterised by their geometrical arrangement
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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
- G02F1/29—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 position or the direction of light beams, i.e. deflection
-
- 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
- G02F1/29—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 position or the direction of light beams, i.e. deflection
- G02F1/294—Variable focal length devices
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- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Geometry (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Liquid Crystal (AREA)
Abstract
The invention discloses a kind of low aberrations mode electrode liquid crystal lens, including being sequentially arranged first substrate, first electrode layer, resistive formation, the first both alignment layers, liquid crystal layer, laying, the second both alignment layers, the second electrode lay, the second substrate, the first electrode layer is equipped with circular pattern electrode；The sheet resistance value of the resistive formation corresponding with the circular pattern electrode is incremented by from the center of the circular pattern electrode to edge.By adjusting the corresponding resistive formation edge of circular pattern electrode to the thickness of center resistive formation or by the Doped ions concentration at the corresponding resistive formation edge of adjusting circular pattern electrode to center resistive formation, obtain the linear change distribution of corresponding region sheet resistance value, to control the graded index profile of liquid crystal lens, good optical path difference distribution and imaging effect are obtained, realizes the low aberrations of liquid crystal lens.
Description
Technical field
The present invention relates to liquid crystal lens technical fields, and in particular to low aberrations mode electrode liquid crystal lens.
Background technique
Traditional optical lens are the thickness by changing uniform refraction materials, because the difference of material thickness causes light
The optical path difference of line is to achieve the effect that convergence or diverging.Conventional lenses have volume and weight big, and focal length is unadjustable etc.
The characteristics of, have been unable to meet the needs of current development.Liquid crystal lens are different with traditional optical lens, it is the uniform plate of thickness
Structure is formed required by lens in the way of space arrangement of the methods of the extra electric field to change evenly distributed liquid crystal molecule
Refractive index spatial distribution, change through light beam space light path be distributed, transmitted light formed with the consistent refraction of lens, reach
The optical effect of lens.And liquid crystal material has electrooptic effect, the index distribution of liquid crystal lens can regulate and control under the electric field, liquid
The focal length of brilliant lens can be by regulating and controlling voltage, and has many advantages, such as that small in size, thickness is thin, is easily integrated, in military, civilian, section
It the various aspects such as grinds and plays extremely important effect.
For common circular hole liquid crystal lens with the increase in aperture, fringing field effect can obvious, small hole center region more
There is no field distribution and liquid crystal molecule can not be made, which to deflect, causes lens effect undesirable, while biggish driving voltage and liquid
The low-power consumption of brilliant lens and advantages of simple structure and simple are runed counter to.And mode electrode liquid crystal lens are on the basis of circular hole liquid crystal lens
It is coated with one layer of high resistance film, the high resistance film of lens is combined with liquid crystal layer, and this special construction makes lens constitute resistance-
Capacitor equivalent circuit overcomes these defects.
With the development of the technologies such as Three-dimensional Display and optic communication, the low aberrations characteristic requirements of liquid crystal lens are further mentioned
It is high.
Summary of the invention
The present invention be directed to more than problem propose a kind of low aberrations mode electrode liquid crystal lens, the mode electrode liquid crystal is saturating
Mirror can be realized low aberrations.
The technological means that the present invention uses is as follows:
A kind of low aberrations mode electrode liquid crystal lens, including be sequentially arranged first substrate, first electrode layer, resistive formation,
First both alignment layers, liquid crystal layer, laying, the second both alignment layers, the second electrode lay, the second substrate, the first electrode layer are equipped with
Circular pattern electrode；The sheet resistance value of the resistive formation corresponding with the circular pattern electrode is by the circular pattern electrode
Center is incremented by edge.
Further, the thickness of the resistive formation is gradually reduced from center to edge, so that the side of the resistive formation
Resistance value is incremented by from the center of the circular pattern electrode to edge.
Further, the thickness of the resistive formation is constant, in the resistive formation concentration of Doped ions from center to
Edge is gradually reduced, so that the sheet resistance value of the resistive formation is incremented by from the center of the circular pattern electrode to edge.
Further, the thickness of the resistive formation is gradually reduced from center to edge, adulterated in the resistive formation from
The concentration of son is gradually reduced from center to edge, so that the sheet resistance value of the resistive formation is incremented by from center to edge.
Further, the sheet resistance value of the resistive formation is from center to edge linear increment.
Further, the laying is fixed on the periphery of the liquid crystal layer.
Further, the circular pattern electrode is circular hole or coaxial more annulus or coaxial disc and annulus.
Further, first both alignment layers and the frictional direction of second both alignment layers are parallel or antiparallel, make institute
The liquid crystal molecule of liquid crystal layer is stated in splayed order state, bend alignment state or state arranged in parallel.
Compared with the prior art, low aberrations mode electrode liquid crystal lens of the present invention have the advantages that this
The thickness of the resistive formation of the electrode liquid crystal lens of disclosure of the invention from center to edge be gradually reduced or resistive formation in adulterate from
The concentration of son is gradually reduced from center to edge, so that the sheet resistance value of resistive formation is incremented by from center to edge, so that circular electric
The linear change of pole area of the pattern sheet resistance value is distributed, to control the graded index profile of liquid crystal lens, obtains good light
Path difference distribution and imaging effect, realize the low aberrations of liquid crystal lens
Detailed description of the invention
Fig. 1 is the structural schematic diagram of low aberrations mode electrode liquid crystal lens of the present invention；
Fig. 2 is that low aberrations mode electrode ion of the present invention spreads liquid crystal lens structure schematic diagram；
Fig. 3 blocks coating implementation diagram for low aberrations mode electrode liquid crystal lens of the present invention；
Fig. 4 is that the ion of low aberrations mode electrode liquid crystal lens of the present invention spreads schematic diagram；
Fig. 5-Fig. 9 respectively indicates the liquid crystal lens light path that maximum optical path difference is 0.83,0.60,0.45,0.38 and 0.33 μm
Difference cloth comparison diagram, wherein (a) is light under different frequency before low aberrations mode electrode liquid crystal lens linear adjustment sheet resistance of the present invention
Path difference distribution is schemed with ideal parabolic optical path difference profiles versus；(b) line is adjusted for low aberrations mode electrode liquid crystal lens of the present invention
Property sheet resistance after optical path difference distribution under different frequency scheme with ideal parabolic optical path difference profiles versus；
Figure 10 is that the optical path difference distribution of low aberrations mode electrode liquid crystal lens of the present invention is distributed with ideal parabolic optical path difference
Related coefficient (a) and maximum optical path difference error (b) comparison diagram.
In figure: 1, first substrate, 2, first electrode layer, 3, resistive formation, the 4, first both alignment layers, 5, liquid crystal layer, 6, liner
Layer, the 7, second both alignment layers, 8, the second electrode lay, 9, the second substrate, 21, circular pattern electrode.
Specific embodiment
Embodiment 1
As shown in Figure 1 be low aberrations mode electrode liquid crystal lens disclosed by the invention, including be sequentially arranged first substrate 1,
First electrode layer 2, resistive formation 3, the first both alignment layers 4, liquid crystal layer 5, laying 6, the second both alignment layers 7, the second electrode lay 8,
Two substrates 9, the first electrode layer 2 are equipped with circular pattern electrode 21；Specifically he, the first substrate 1, the second substrate 9 are divided
It is not set to the upper/lower terminal of the liquid crystal layer 5, is covered each by above 1 lower section of first substrate and the second substrate 9
There are the first electrode layer 2 and the second electrode lay 8, circular pattern electrode 21 is provided in the first electrode layer 2, it is round
Pattern electrode 21 is circular hole or coaxial more annulus or coaxial disc and annulus, is covered on the circular pattern electrode 21
Resistive formation 3 is stated, first both alignment layers 4 are coated between the resistive formation 3 and the liquid crystal layer 5, second orientation
Layer 7 be coated between the second electrode lay 8 and the liquid crystal layer 5, the thickness of the resistive formation 3 from center to edge gradually
Reduce, so that center of the sheet resistance value of the resistive formation corresponding with the circular pattern electrode by the circular pattern electrode
It is incremented by edge, it is preferable that the thickness change of resistive formation is linear change, so that the sheet resistance value of the resistive formation is by described
The center of circular pattern electrode is to edge linear increment, and in the present embodiment, the material of resistive formation uses zinc oxide, the material
With high resistant characteristic, aluminium is mixed in resistive formation to make it have the low-resistance characteristic relative to intrinsic zinc oxide.In the present invention, obtain
The resistive formation corresponding with the circular pattern electrode refers to the resistive formation with circular pattern electrode contact point.
Low aberrations mode electrode liquid crystal lens of the invention are caused due to thickness difference of the resistive formation from edge to center
Sheet resistance is different, when applying the alternating voltage with certain frequency, due to the effect of the resistive formation, sheet resistance value from edge to
Center is gradually successively decreased, and the voltage value that circular pattern electrode is applied to the liquid crystal molecule in liquid crystal layer gradually subtracts from edge to center
It is small, so that radially index distribution changes liquid crystal molecule in gradient at different location, to realize lens low aberrations, obtain more preferable
Imaging effect.
It is different that thickness of the resistive formation from edge to center can be accomplished by the following way:
1, ink jet printing: for the method shape of more than 21 ink jet printings of circular pattern electrode (material of spraying resistive formation)
At the corresponding resistive formation thickness of circular pattern electrode 21 by the variation at edge to center, often, thickness is generous for ink jet printing
It hinders small；Number is few, and the small sheet resistance of thickness is big.Make circular diagram in the difference of 21 edge of circular pattern electrode to center ink jet printing number
The corresponding resistive formation of pattern electrode 21 forms linear sheet resistance distribution.
2, block etching: the method for blocking etching for circular pattern electrode 21 leads to height according to the difference of etch period
The thickness at resistive layer edge to center is different, to form linear sheet resistance distribution.
3, it blocks coating: forming resistive formation by edge to center for the method that circular pattern electrode 21 blocks coating
Thickness change, often, the big sheet resistance of thickness is small for coating；Number is few, and the small sheet resistance of thickness is big.At 21 edge of circular pattern electrode in
The difference of heart coating number makes the linear sheet resistance distribution of resistive formation, as shown in Figure 3.
Resistive formation can with but be not limited only to by magnetron sputtering, chemical vapor deposition, molecular beam epitaxy, electron beam steam
Hair, atomic layer epitaxy and sol-gal process spin coating, printing process and the above method are combined acquisition.
Further, the first both alignment layers 4 are parallel or antiparallel with 7 frictional direction of the second both alignment layers, make the liquid crystal molecule be in
Splayed order state, bend alignment state or state arranged in parallel.Specifically, there are many aligned: friction orientation, light
Control orientation, inclination vapor deposition orientation.
It further, further include laying, the laying is fixed on the periphery of the liquid crystal layer, specifically, using side
Laying 6 is fixed on the periphery of liquid crystal layer 5 by frame glue, and laying upper and lower ends pass through frame glue sticking first substrate 1, the second base
Plate 9 is liquid crystal layer 5 to be isolated with external environment.
Further, the distance between the outer edge of circular pattern electrode and the laying are 0.5mm-2mm.Due to circle
The variation of index distribution will occur for corresponding liquid crystal molecule under shape pattern electrode 21, therefore 21 outer edge of circular pattern electrode is pre-
A distance is reserved, when to apply voltage, stable electric field structure can be formed.
Further, the laying be film column structure, the film with a thickness of 5um-200um, the substrate
With a thickness of 0.1mm-5mm.
Mode electrode liquid crystal lens functions principle is as follows:
Mode electrode liquid crystal lens are covered with resistive formation 3 in the painting of first electrode layer 2, and the material of first electrode layer 2 is to stablize
Conductive formation such as tin indium oxide (ITO) electrode material applies the bridge of driving voltage and resistive formation 3, circular diagram as connection
Resistive formation 3 on pattern electrode 21 controls the performance of lens.Mode electrode liquid crystal lens resistive formation 3 is modulation liquid crystal molecule
The Potential Distributing of the core of deflection, resistive formation 3 is related with application voltage and frequency and the sheet resistance of resistive formation 3.It is whole
A mode electrode liquid crystal lens are equivalent to a capacity plate antenna, and liquid crystal material is the medium in capacity plate antenna, if signal occurs
One AC sine signal is applied on mode electrode liquid crystal lens by device, since the presence of resistive formation 3 on substrate will shape
At resistance-capacitor equivalent circuit.When one timing of voltage swing and frequency of driving circuit, the height electricity of mode electrode liquid crystal lens
Parabola variation is presented in potential in resistance layer 3.At the center of circular pattern electrode 21, potential is minimum, the liquid crystal in lens point
The deflection of son is minimum, and refractive index is larger, according to formula v=c/n (wherein c is vacuum light speed, and n is refractive index), so incident light
Speed it is slower；And in the edge of circular pattern electrode 21, the deflection of the potential highest of electrode, liquid crystal molecule is maximum, refraction
Rate is smaller, so the fast speed of incident light.Since liquid crystal has birefringent characteristic, folding of the extraordinary ray e light along different directions
Penetrate rate difference.Therefore, the refractive index at 21 center of circular pattern electrode can be different from the refractive index at 21 edge of circular pattern electrode,
Light path when position each by liquid crystal lens so as to cause light is different, generates optical path difference distribution.
Mode electrode liquid crystal lens due to circular pattern electrode 21 fringing field effect, 21 edge of circular pattern electrode
Optical path difference distribution is not ideal parabola optical path difference distribution curve.Optical path difference curve and ideal parabola optical path difference curve
Related coefficient it is lower, correlation is poor, and the two optical path difference distribution deviation is larger, and maximum optical path difference error is larger, thus at
Picture effect is poor, as shown in Fig. 5-9 (a).
By mode electrode liquid crystal lens resistance-capacitor equivalent circuit theory it is found that the sheet resistance of resistive formation 3 affects mould
The optical path difference distribution curve of formula electrode liquid crystal lens, it is desirable to obtain more preferably parabola optical path difference distribution and need to circular diagram
21 resistive formation 3 of pattern electrode is adjusted.In the present invention, 3 thickness control circular pattern electrode of resistive formation, 21 center to side is adjusted
The sheet resistance difference of each position of edge is compatible with microelectronics preparation process in technique.
The linear change for adjusting resistance can be, but not limited to using formula:
R□=25+2.5n
In the present embodiment, it is divided into 1000 parts for the corresponding radius of circular pattern electrode is equidistant, the value of n is from circular pattern
Electrode centers to being 1-1000 with edge, so sheet resistance value from center to edge from 25M Ω/sq linear change to 275M Ω/
sq。
In order to compare the optical characteristics for adjusting sheet resistance front and back lens, it is 21V that voltage is kept in test, is made by adjusting frequency
The maximum optical path difference for adjusting sheet resistance front and back lens is consistent.Pass through optical path difference distribution and ideal parabolic after adjusting sheet resistance distribution
The related coefficient consistency of optical path difference distribution is higher, and correlation is good, shows that the two optical path difference distribution curve is more nearly, adjusts
Maximum optical path difference error after sheet resistance decreases compared to the maximum optical path difference error before adjusting sheet resistance, so imaging effect is more
It is good, as shown in Fig. 5-9 (b).
In conclusion sheet resistance of adjusting 3 thickness control circular pattern electrode of resistive formation, 21 center to each position in edge
Difference can regulate and control the speed of voltage decline, realize the control deflected to liquid crystal molecule, improve and ideal optical path difference curve
Related coefficient simultaneously reduces its optical path difference error, as shown in Figure 10, to improve lens performance, realizes low aberrations.
Embodiment 2
Be illustrated in figure 2 the second way of low aberrations mode electrode liquid crystal lens disclosed by the invention, the embodiment with
Embodiment 1 the difference lies in that in embodiment 1 by change resistive formation thickness so that with the circular pattern electrode
The sheet resistance value of the corresponding resistive formation is incremented by from the center of the circular pattern electrode to edge.In the present embodiment, institute
The thickness for stating resistive formation is constant, and the concentration of Doped ions is gradually reduced from center to edge in the resistive formation, so that
The sheet resistance value of the resistive formation is incremented by from center to edge.In the present embodiment, the material of resistive formation uses zinc oxide, should
Material has high resistant characteristic, mixes aluminium ion in resistive formation to make it have the low-resistance characteristic relative to intrinsic zinc oxide, leads to
Cross the sheet resistance values that are different and then changing resistive formation in resistive formation doping chlorine ion concentration.
It can be realized by the following method for the concentration difference of Doped ions in resistive formation:
1. ion is spread: the Doped ions concentration by adjusting resistive formation 3 corresponding with circular pattern electrode 21 causes
Sheet resistance is different, ion diffusion occurs from the corresponding center of circular pattern electrode to edge, center Doped ions concentration is high, sheet resistance
It is small, it is gradually reduced with edge ion concentration is diffused into, sheet resistance is gradually increased, so that linear sheet resistance distribution is formed, such as Fig. 4 institute
Show.The thickness of circular pattern electrode edge to the center resistive formation 3 remains unchanged at this time, ion concentration variation.
Embodiment 3
In the present embodiment, the concentration of Doped ions in the thickness and resistive formation of resistive formation is changed simultaneously, that is,
The thickness of resistive formation be gradually reduced from center to edge and meanwhile in resistive formation Doped ions concentration also from center to edge
It is gradually reduced, higher side's resistance varying-ratio can be obtained by this method, to realize the mode electrode with lower aberration
Liquid crystal lens.In the present embodiment, other structures are identical as embodiment 1 and embodiment 2.
It can be realized by the following method for resistive formation in the embodiment:
Ink jet printing ion diffusion, block etching ion diffusion, block Coating Ions diffusion the methods of control resistive formation 3
The Doped ions concentration that 21 edge of border circular areas to center resistive formation 3 are controlled while thickness causes sheet resistance different, forms line
Property sheet resistance variation.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Anyone skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (8)
1. a kind of low aberrations mode electrode liquid crystal lens, including it is sequentially arranged first substrate, first electrode layer, resistive formation,
One both alignment layers, liquid crystal layer, laying, the second both alignment layers, the second electrode lay, the second substrate, the first electrode layer are equipped with circle
Shape pattern electrode；It is characterized by:
The sheet resistance value of the resistive formation corresponding with the circular pattern electrode is from the center of the circular pattern electrode to side
Edge is incremented by.
2. low aberrations mode electrode liquid crystal lens according to claim 1, it is characterised in that: the thickness of the resistive formation
It is gradually reduced from center to edge, so that the sheet resistance value of the resistive formation is passed from the center of the circular pattern electrode to edge
Increase.
3. low aberrations mode electrode liquid crystal lens according to claim 1, it is characterised in that: the thickness of the resistive formation
Constant, the concentration of Doped ions is gradually reduced from center to edge in the resistive formation, so that the sheet resistance of the resistive formation
Value is incremented by from the center of the circular pattern electrode to edge.
4. low aberrations mode electrode liquid crystal lens according to claim 1, it is characterised in that: the thickness of the resistive formation
It is gradually reduced from center to edge, the concentration of Doped ions is gradually reduced from center to edge in the resistive formation, so that institute
The sheet resistance value for stating resistive formation is incremented by from center to edge.
5. low aberrations mode electrode liquid crystal lens as claimed in any of claims 1 to 4, it is characterised in that: described
The sheet resistance value of resistive formation is from center to edge linear increment.
6. low aberrations mode electrode liquid crystal lens according to claim 5, it is characterised in that: the laying is fixed on institute
State the periphery of liquid crystal layer.
7. low aberrations mode electrode liquid crystal lens according to claim 6, it is characterised in that: the circular pattern electrode is
Circular hole or coaxial more annulus or coaxial disc and annulus.
8. low aberrations mode electrode liquid crystal lens according to claim 7, it is characterised in that: first both alignment layers and institute
The frictional direction for stating the second both alignment layers is parallel or antiparallel, makes the liquid crystal molecule of the liquid crystal layer be in splayed order state, is curved
Bent ordered state or state arranged in parallel.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113777833A (en) * | 2021-08-16 | 2021-12-10 | 广东工业大学 | Liquid crystal lens aberration optimization method and application |
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| CN113777833A (en) * | 2021-08-16 | 2021-12-10 | 广东工业大学 | Liquid crystal lens aberration optimization method and application |
| CN113777833B (en) * | 2021-08-16 | 2023-08-08 | 广东工业大学 | Liquid crystal lens aberration optimization method and application |
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Application publication date: 20190924 |