CN211454165U - Variable-focus liquid crystal lens with arc-shaped columnar cavity and electrodes - Google Patents
Variable-focus liquid crystal lens with arc-shaped columnar cavity and electrodes Download PDFInfo
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- CN211454165U CN211454165U CN202020019192.1U CN202020019192U CN211454165U CN 211454165 U CN211454165 U CN 211454165U CN 202020019192 U CN202020019192 U CN 202020019192U CN 211454165 U CN211454165 U CN 211454165U
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Abstract
The utility model discloses a variable-focus liquid crystal lens of arc column cavity and electrode mainly includes protective housing, drive module and sets up upper electrode, bottom electrode, liquid crystal orientation layer and the liquid crystal in the protective housing. The utility model discloses after pouring the liquid crystal, can be so that the liquid crystal molecule of the inside fills space and evenly distributed according to even arc column, later through orientation effect messenger liquid crystal molecule carry out the orientation arrangement according to the required direction of experimental study, can so can make when not adding the external electric field, the liquid crystal molecule has certain deflection angle. So, when follow-up needs carried out the wider range and zoom, the liquid crystal molecule need go to rotate bigger angle through impressed voltage, increases the angle on the basis that has certain deflection angle liquid crystal molecule, can make the voltage of the external electric field that adds reduce relatively, that is to say relative parallel plate zoom liquid crystal lens, the horizontal liquid crystal molecule is rotated the voltage that the same number of degrees need be exerted and is compared the utility model discloses it is big.
Description
Technical Field
The utility model relates to a liquid crystal lens field especially relates to an arc column cavity structure, along the variable liquid crystal lens of focus of the arc column electrode that arc column cavity laid.
Background
With the continuous development of science and technology and the continuous deepening of research, people's work research and many fields of daily life have more and higher requirements on lenses, especially on focus-adjustable lenses.
As is well known, the focal length of a conventional lens is fixed, and thus, conventional zoom systems are combined by a plurality of single-focal-length lenses having different focal lengths, and require mechanical focusing. Such a zoom system has various disadvantages, such as complicated structure, complicated operation, high operation requirement, complicated manufacturing process, high cost, and further, it is unsatisfactory that the zoom range is limited, and the zoom requirement of various works cannot be satisfied, thereby greatly limiting the development and application thereof. The appearance of the electrically controlled zoom liquid crystal lens solves a plurality of problems of the traditional zoom lens or zoom system to a great extent. The electric control zoom liquid crystal lens utilizes the electro-optical effect (electric control birefringence effect) of liquid crystal, namely, the arrangement direction of liquid crystal molecules is changed by applying an electric field, so that the refractive index ne of corresponding extraordinary light is continuously changed to the refractive index no of the ordinary light, the orientation of the liquid crystal molecules in the box is controlled by voltage, the refractive index is changed, the focal length is correspondingly adjusted, and the purpose of realizing the function of the lens is achieved. Specifically, the liquid crystal has the crystal diversity, that is, when a light beam passes through the liquid crystal layer, the light beam is divided into two light beams with different polarization directions: and the light o and the light e, wherein the light o is ordinary light, and the light e is extraordinary light. When the o light propagates in the liquid crystal, the refractive index is constant no matter which direction the o light is directed to, and the e light just opposite to the o light vibrates in a direction perpendicular to the o light, so that the o light has different refractive indexes when propagating in different directions. Because of this, when an electric field is applied to the liquid crystal, the director of some liquid crystal molecules tends to be oriented along the direction of the electric field, so that the deflection angle of the director of the liquid crystal molecules will change with the change of the voltage, and the equivalent refractive indexes in the same direction will be different, thereby forming a gradient refractive index, and when the polarized light is incident, the polarized light will be converged or diverged. It is the combination of these characteristics that the liquid crystal lens has the function of electrically controlled zooming. In short, the liquid crystal molecules are turned under the action of the electric field, so that the polarized light passing through the lens is refracted to achieve the focusing effect, the electrically controlled zooming is realized, the zooming range can be controlled by the voltage, and the specific working principle is shown in fig. 5. The structure of the zoom lens is simpler and more miniaturized, the zoom lens is simple and easy to manufacture and low in cost, zooming is flexible, the zoom lens has multiple zoom levels, and zooming is more convenient, accurate and fine. The electric control zoom liquid crystal lens is also a research hotspot rapidly, is widely and abundantly applied and has replaced the traditional zoom lens in many fields.
The zoom liquid crystal lenses developed today are of many kinds and are also expanding in application fields and functions. As in the field of scientific research there are many variable-focus liquid crystal lenses: single circular hole electrode type, strip electrode type, circular ring-disk electrode type, single or double layer type liquid crystal lens, etc.; a light field microscope liquid crystal lens, an endoscope liquid crystal lens, and the like in the medical field; 3D display type liquid crystal lenses in entertainment life, naked eye 3D liquid crystal lens display devices and the like. Liquid crystal lenses have found considerable application in many fields.
However, since some key technical problems of the liquid crystal lens are not solved and perfected, further application of the liquid crystal lens is limited. Many researchers today encounter and continue to improve the problems of excessive driving voltage, insufficient focusing range, and insufficient response speed of the zoom liquid crystal lens. Accordingly, further improvements and improvements are needed in the art.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art not enough, provide a drive voltage lower, response speed is faster, the structure is more excellent zoom liquid crystal lens.
The purpose of the utility model is realized through the following technical scheme:
a variable-focus liquid crystal lens with an arc-shaped columnar cavity and electrodes mainly comprises a protective shell, a driving module, an upper electrode, a lower electrode, a liquid crystal orientation layer and liquid crystals, wherein the upper electrode, the lower electrode, the liquid crystal orientation layer and the liquid crystals are arranged in the protective shell. The protective housing adopts the design of arcuation arch structure, and the cross section is hollow annular, still is equipped with the cavity that is used for annotating the liquid crystal in the protective housing. The upper electrode is arranged in the cavity of the protective shell, is positioned on the upper wall of the cavity and is arranged along the arc of the cavity. The lower electrode is arranged in the cavity of the protective shell, is positioned on the lower wall of the cavity and is arranged along the arc of the cavity. The liquid crystal orientation layer is respectively arranged on the upper electrode and the lower electrode and is fixedly connected with the upper electrode and the lower electrode. The liquid crystal fills the cavity in the protective shell; and the output end of the driving module is respectively and electrically connected with the upper electrode and the lower electrode.
Furthermore, a round hole for generating an uneven electric field is further formed in the lower electrode, and the round hole is formed in the center of the lower electrode.
As the preferred scheme of the utility model, the protective housing adopts the high glass material of luminousness to make.
In a preferred embodiment of the present invention, the liquid crystal is nematic liquid crystal.
As the preferred scheme of the utility model, the upper electrode and the lower electrode are both round electrodes made of transparent indium zinc oxide materials.
The utility model discloses a working process and principle are: the utility model discloses on the basis of existing dull and stereotyped liquid crystal lens, make into even arc column with the liquid crystal box inside liquid crystal is annotated shape by conventional cuboid along certain range of certain direction bending, after pouring the liquid crystal, can make the liquid crystal molecule of the inside fill space and evenly distributed according to even arc column, later make the liquid crystal molecule carry out the alignment according to the required direction of experimental study through orientation, can so can make when not adding the external electric field, the liquid crystal molecule has certain deflection angle. So, when follow-up needs carried out the wider range and zoom, the liquid crystal molecule need go to rotate bigger angle through impressed voltage, increases the angle on the basis that has certain deflection angle liquid crystal molecule, can make the voltage of the external electric field that adds reduce relatively, that is to say relative parallel plate zoom liquid crystal lens, the horizontal liquid crystal molecule is rotated the voltage that the same number of degrees need be exerted and is compared the utility model discloses it is big. Further, this relatively increases the response speed of the zoom lens. Meanwhile, the conventional flat plate-circular hole electrode is changed into an arc-circular hole electrode laid along the upper outer wall and the lower outer wall of the arc-shaped columnar cavity, so that the overall size of the lens can be further reduced, and the liquid crystal lens is further miniaturized.
Compared with the prior art, the utility model discloses still have following advantage:
(1) the utility model provides a liquid crystal lens that can zoom of arc column cavity and electrode adopts even arc column to fill liquid crystal lens, can have on the basis of certain angle at the liquid crystal molecule further add drive voltage and make it turn to drive voltage is lower when can making it reach and rotate the same angle with dull and stereotyped liquid crystal lens molecule, thereby just also can improve the response speed of lens correspondingly.
(2) Compared with the prior flat liquid crystal lens, the variable-focus liquid crystal lens with the arc-shaped columnar cavity and the electrode provided by the utility model equivalently performs pretreatment of a deflection angle on liquid crystal molecules, thereby reducing the driving voltage and improving the response speed of the liquid crystal lens; meanwhile, the liquid crystal lens is equivalent to some concave liquid crystal lenses or convex liquid crystal lenses, the problem that liquid crystal molecules are unevenly distributed at the middle part and the two ends of the concave-convex liquid crystal lens can be solved, light can be better transmitted and focused, and the problems of poor focusing effect, imaging distortion, chromatic dispersion and the like caused by uneven liquid crystal distribution can be weakened or eliminated. The change of the electrodes also enables the overall volume of the lens to be further reduced.
(3) The utility model provides a simple structure in the aspect of the preparation of the variable focus liquid crystal lens of arc column cavity and electrode, electrode design and liquid crystal fill, seal technical means such as box can directly follow current ripe method and means in the past, have solved a great deal of problem for the preparation of lens.
Drawings
Fig. 1 is a schematic cross-sectional view of a variable focus liquid crystal lens with arc-shaped cylindrical cavities and electrodes provided by the present invention.
Fig. 2 is a cross-sectional view of the variable focus liquid crystal lens with the arc-shaped cylindrical cavity and the electrode provided by the present invention.
FIG. 3 is a schematic diagram of a liquid crystal molecule refractive index ellipsoid provided by the present invention.
Fig. 4 is a schematic diagram of the refraction degree of the variable focus liquid crystal lens with the arc-shaped cylindrical cavity and the electrodes before and after applying the voltage.
Fig. 5 is a schematic diagram illustrating the degree of refraction of light before and after applying a voltage to a conventional planar/flat liquid crystal lens.
The reference numerals in the above figures illustrate:
1-upper electrode, 2-lower electrode, 3-liquid crystal orientation layer, 4-protective shell, 5-liquid crystal, 6-drive module and 7-round hole.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer and clearer, the present invention will be further described with reference to the accompanying drawings and examples.
Example 1:
as shown in fig. 1 to 4, the present embodiment discloses a variable focus liquid crystal lens with arc-shaped cylindrical cavities and electrodes, which mainly includes a protective shell 4, a driving module 6, and an upper electrode 1, a lower electrode 2, a liquid crystal alignment layer 3 and a liquid crystal 5 disposed in the protective shell 4. The protective housing 4 is designed to be of an arc-shaped arch structure, the cross section of the protective housing is hollow and annular, and a cavity for filling the liquid crystal 5 is further arranged in the protective housing 4. The upper electrode 1 is arranged in the cavity of the protective shell 4, is positioned on the upper wall of the cavity and is arranged along the arc shape of the cavity. The lower electrode 2 is arranged in the cavity of the protective shell 4, is positioned on the lower wall of the cavity and is arranged along the arc shape of the cavity. The liquid crystal alignment layer 3 is respectively arranged on the upper electrode 1 and the lower electrode 2 and is fixedly connected with the upper electrode 1 and the lower electrode 2. The liquid crystal 5 fills the cavity in the protective shell 4; the output end of the driving module 6 is electrically connected with the upper electrode 1 and the lower electrode 2 respectively.
Further, a round hole 7 for generating an uneven electric field is further formed in the lower electrode 2, and the round hole 7 is formed in the center of the lower electrode 2.
As a preferred embodiment of the present invention, the protective housing 4 is made of a glass material with high transmittance.
In a preferred embodiment of the present invention, the liquid crystal 5 is a nematic liquid crystal.
As a preferred embodiment of the present invention, the upper electrode 1 and the lower electrode 2 are both circular electrodes made of transparent indium zinc oxide material.
The utility model discloses a working process and principle are: the utility model discloses on the basis of existing dull and stereotyped liquid crystal lens, the shape of annotating liquid crystal 5 with the liquid crystal box inside is made into even arc column by the certain range of conventional cuboid along the crooked of a certain direction, after pouring liquid crystal 5, can make 5 molecules of liquid crystal of the inside fill the space and evenly distributed according to even arc column, later make 5 molecules of liquid crystal carry out the orientation arrangement according to the required direction of experimental study through the orientation effect, so can make when not adding the external electric field, 5 molecules of liquid crystal have certain deflection angle. So, when follow-up needs carried out the wider range and zoom, 5 molecules of liquid crystal need go to rotate bigger angle through applied voltage, increase the angle on the basis that has certain deflection angle liquid crystal 5 molecules, can make the voltage of the external electric field that adds reduce relatively, that is to say relatively parallel plate zoom liquid crystal lens, the voltage that the same number of degrees need be applyed is crossed to 5 molecules of horizontal liquid crystal than the utility model discloses it is big. Further, this relatively increases the response speed of the zoom lens. Meanwhile, the prior flat plate-round hole 7 electrode is changed into an arc-round hole 7 electrode laid along the upper outer wall and the lower outer wall of the arc-shaped columnar cavity, so that the overall size of the lens can be further reduced, and the liquid crystal lens is further miniaturized.
Example 2:
the objective of this embodiment is to provide a variable focus liquid crystal lens, which is internally arc-shaped and columnar and filled with liquid crystal 5, so that when no electric field is applied, molecules of the liquid crystal 5 have a certain deflection angle, and a larger angle is provided for the turning of the molecules of the liquid crystal 5 after the electric field is subsequently applied, thereby reducing the driving voltage and increasing the response speed of the liquid crystal lens to a certain extent. Meanwhile, the electrode laying mode is changed into an arc cylindrical round hole 7 electrode, so that the effect of reducing the volume of the liquid crystal lens is achieved.
The technical scheme adopted by the embodiment is as follows:
a variable focus liquid crystal lens, the lens comprising: the liquid crystal display comprises an upper electrode 1, a lower electrode 2, an upper PI layer, a lower PI layer (a liquid crystal orientation layer 3), a glass protective shell 4, nematic liquid crystal 5, an external voltage drive and a bottom lower electrode 2 central electrode round hole 7.
The upper electrode 1 is a transparent ITO (Indium tin oxide, Indium zinc oxide) circular electrode that can be patterned by etching as needed. The ITO has the excellent characteristics of strong conductive capability, high transmittance and the like, has high transparency to visible light, has the transmittance of over 80 percent, and is particularly suitable for conductive electrodes of liquid crystal lenses; the lower electrode 2 is a commonly used round hole 7ITO circular electrode capable of providing a required electric field; the orientation layer is a PI (Polyimide) orientation layer laid along the cavity filled with the spherical liquid crystal 5, and can align the liquid crystal 5 molecules according to an arc-shaped columnar cavity or an actually required direction. The intrinsic liquid crystal 5 molecules are randomly oriented, so that an alignment layer needs to be added on the surface of the liquid crystal layer to make the initial orientations of the liquid crystal 5 molecules uniform. When no driving voltage is applied, the arrangement of the director of the liquid crystal 5 molecules tends to a preset direction so as to enable the initial free energy to be minimum, after external driving voltage is applied, the director of the liquid crystal 5 molecules turns along with an external electric field, so that the anchoring force on the surface of the liquid crystal 5 molecules is balanced with the action of the external electric field to keep the integral free energy to be minimum, and the help is provided for the subsequent voltage to change the deflection angle of the liquid crystal 5 molecules; the glass protective shell 4 comprises a glass protective shell 4 which is manufactured along the arc-shaped columnar cavity outside the whole columnar lens, the light transmittance of a glass material of the glass protective shell is quite high, and the glass protective shell can play a role in protecting the liquid crystal 5 and standardizing the shape of the whole lens and also can not generate large interference on incident light; the liquid crystal 5 adopts common nematic liquid crystal with stable and excellent performance; the voltage drive provides zoom voltage for the lens, the zoom voltage is connected with the upper electrode 1 and the lower electrode 2, and different voltages for changing the focal length of the lens can be provided by connecting the electrodes with an external drive circuit; the bottom lower electrode 2 central electrode round hole 7 is a round hole 7 opened at the central position of the lower electrode 2, and corresponds to the round hole 7 in the traditional flat lens lower electrode 2. The cross-sectional view and the perspective view of the liquid crystal 5 zoom lens are shown in fig. 1 and fig. 2, fig. 3 is a schematic diagram of the principle of the liquid crystal 5 molecular refractive index ellipsoid, and fig. 4 is a schematic diagram of the working principle of the liquid crystal lens of the present invention.
The utility model discloses the polarized light refraction focusing phenomenon behind the light jet-in liquid crystal 5 can explain with 5 refracting index ellipsoids of liquid crystal: as shown in fig. 4, the molecules of the liquid crystal 5 used in the present invention have a long rod-like molecular structure, and are materials with excellent positive single-axis photoelectric properties, and the molecules of the liquid crystal 5 have a property of changing the arrangement mode with the change of the electric field. Therefore, the liquid crystal zoom lens mainly utilizes the non-uniform electric field generated by the circular hole 7 electrode to enable the arrangement deflection angle of the liquid crystal 5 molecules to generate a gradient change, thereby enabling the refractive index of the liquid crystal 5 molecules to generate a gradient change and presenting a refractive index gradient distribution similar to a lens. Fig. 3 is a schematic diagram of a liquid crystal 5 molecule refractive index ellipsoid, in which when light is incident on the liquid crystal 5 molecules along different directions, the refractive index is different, that is, when the deflection angle of the liquid crystal 5 molecules is changed, the obtained refractive index is different after the light is incident on the liquid crystal 5. When the polarization direction of the incident light is parallel to the long axis direction of the liquid crystal 5 molecules, the refractive index is ne(ii) a When the polarization direction of the incident light is perpendicular to the long axis direction of the liquid crystal 5 molecules, the refractive index is noWhen the angle between the polarization direction of the incident light and the long axis of the liquid crystal 5 molecules is theta, the refractive index is neff(θ)，The expression is as follows:
wherein: in the formula no≤neff(θ)≤ne，neRepresents a refractive index when the polarization direction of incident light is parallel to the long axis direction of the liquid crystal 5 molecules; n isoIndicating the refractive index when the polarization direction of incident light is perpendicular to the long axis direction of the molecules of the liquid crystal 5; θ represents the angle between the polarization direction of the incident light and the long axis of the molecules of the liquid crystal 5.
From the above, it can be seen that the working schematic diagram of the liquid crystal zoom lens of the present invention is shown in fig. 4.
The utility model discloses a design of cavity is filled to arc column liquid crystal 5, then makes 5 molecules of liquid crystal carry out the alignment through PI orientation layer and arranges according to the shape of arc column cavity for 5 molecules of liquid crystal just have certain angle at initial condition, in short just carry out a preliminary treatment to 5 molecules of liquid crystal, make the initial condition of whole liquid crystal lens be equal to the state that 5 molecules of liquid crystal rotate certain angle when exerting a certain voltage of dull and stereotyped liquid crystal lens, its actual operating condition principle of liquid crystal zoom lens is as shown in figure 4: when no voltage is applied, the liquid crystal zoom lens has a focusing effect in an initial state due to the initial deflection angle of the molecules of the liquid crystal 5 when a beam of polarized light enters the liquid crystal lens because of the pretreatment of the arc-shaped cylindrical hollow shell; when an external voltage is applied, the liquid crystal 5 molecules subjected to preprocessing can be further deflected, so that a further zooming effect is realized on the basis of initial focusing, and the driving voltage and the response speed of the liquid crystal lens can be obviously reduced. The angle of the pretreatment can be changed according to the lens and the actual requirement, but the angle of the pretreatment is not too large, and the too large angle of the pretreatment can cause the focusing range of the whole lens to be seriously reduced, thereby greatly influencing the focusing function and the practicability of the liquid crystal lens. Because the preprocessing angle is too large, the liquid crystal 5 molecules in the liquid crystal lens are directly deflected at a large angle, and the space of the rotation angle of the liquid crystal 5 molecules which are regulated and controlled by voltage subsequently is reduced, so that the focusing range is reduced.
The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be equivalent replacement modes, and all are included in the scope of the present invention.
Claims (5)
1. A variable-focus liquid crystal lens with an arc-shaped columnar cavity and electrodes is characterized by comprising a protective shell, a driving module, an upper electrode, a lower electrode, a liquid crystal orientation layer and liquid crystals, wherein the upper electrode, the lower electrode, the liquid crystal orientation layer and the liquid crystals are arranged in the protective shell; the protective shell is designed to be of an arc-shaped arch structure, the cross section of the protective shell is in a hollow annular shape, and a cavity for filling liquid crystals is further arranged in the protective shell; the upper electrode is arranged in the cavity of the protective shell, is positioned on the upper wall of the cavity and is arranged along the arc of the cavity; the lower electrode is arranged in the cavity of the protective shell, is positioned on the lower wall of the cavity and is arranged along the arc of the cavity; the liquid crystal orientation layer is respectively arranged on the upper electrode and the lower electrode and is fixedly connected with the upper electrode and the lower electrode; the liquid crystal fills the cavity in the protective shell; and the output end of the driving module is respectively and electrically connected with the upper electrode and the lower electrode.
2. The variable focus liquid crystal lens with an arc-shaped cylindrical cavity and an electrode as claimed in claim 1, wherein the lower electrode is further provided with a circular hole for generating an uneven electric field, and the circular hole is arranged at the center of the lower electrode.
3. The variable focus liquid crystal lens with an arc-shaped cylindrical cavity and an electrode as claimed in claim 1, wherein the protective shell is made of a glass material with high light transmittance.
4. The variable focus liquid crystal lens with curved cylindrical cavities and electrodes of claim 1, wherein said liquid crystal is nematic liquid crystal.
5. The variable focus liquid crystal lens with curved cylindrical cavities and electrodes of claim 1, wherein said upper and lower electrodes are circular electrodes made of transparent indium zinc oxide material.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020019192.1U CN211454165U (en) | 2020-01-06 | 2020-01-06 | Variable-focus liquid crystal lens with arc-shaped columnar cavity and electrodes |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020019192.1U CN211454165U (en) | 2020-01-06 | 2020-01-06 | Variable-focus liquid crystal lens with arc-shaped columnar cavity and electrodes |
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| CN211454165U true CN211454165U (en) | 2020-09-08 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111045240A (en) * | 2020-01-06 | 2020-04-21 | 广东工业大学 | Variable-focus liquid crystal lens with arc-shaped columnar cavity and electrodes |
| CN113671762A (en) * | 2021-08-26 | 2021-11-19 | 上海天马微电子有限公司 | Light modulation device |
-
2020
- 2020-01-06 CN CN202020019192.1U patent/CN211454165U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111045240A (en) * | 2020-01-06 | 2020-04-21 | 广东工业大学 | Variable-focus liquid crystal lens with arc-shaped columnar cavity and electrodes |
| CN113671762A (en) * | 2021-08-26 | 2021-11-19 | 上海天马微电子有限公司 | Light modulation device |
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