CN112034658B - Zoom liquid crystal lens - Google Patents
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- CN112034658B CN112034658B CN202011206571.2A CN202011206571A CN112034658B CN 112034658 B CN112034658 B CN 112034658B CN 202011206571 A CN202011206571 A CN 202011206571A CN 112034658 B CN112034658 B CN 112034658B
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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
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/12—Fluid-filled or evacuated lenses
- G02B3/14—Fluid-filled or evacuated lenses of variable focal length
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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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Abstract
The embodiment of the application provides a zoom liquid crystal lens, and belongs to the technical field of virtual reality display. The zoom liquid crystal lens comprises a plurality of liquid crystal devices which are sequentially stacked along a first direction, each liquid crystal device comprises a first substrate and a second substrate, a liquid crystal layer is arranged between the first substrate and the second substrate, a plurality of first electrodes which are electrically insulated from each other are arranged on one side, close to the second substrate, of the first substrate at intervals, a second electrode is arranged on one side, close to the first substrate, of the second substrate, and the first electrodes and the second electrodes are used for providing driving voltage for the liquid crystal layer. The projections of the plurality of first electrodes in each liquid crystal device in a first plane perpendicular to the first direction are concentric rings, the sizes of the first electrodes of the liquid crystal devices arranged in sequence along the first direction are reduced in sequence, and the projections of the first electrodes in any two liquid crystal devices in the first plane do not intersect. The zoom liquid crystal lens can effectively reduce response time and is beneficial to wide application in the field of virtual reality.
Description
Technical Field
The application belongs to the technical field of virtual reality display, and particularly relates to a zoom liquid crystal lens.
Background
Lenses are basic optical devices, and are found anywhere in optical instruments and equipment. With the development of optical technology, the requirements on the lens are higher and higher, one is that the focal length of the lens is continuously adjustable, and the other is that a large-focal-length lens is provided.
In the prior art, the first electrode in the fresnel zoom liquid crystal lens includes a plurality of concentric circular ring-shaped electrodes, and a gradient distribution with non-uniform refractive index is formed in the liquid crystal layer under the action of an external electric field.
However, in a virtual reality device that requires a large zoom lens aperture to obtain a large field of view, a large phase retardation is required to achieve the working focal length of the liquid crystal lens, and the thickness of the corresponding liquid crystal layer is large, which results in a long response time of the liquid crystal lens device.
Disclosure of Invention
An object of the present application includes, for example, providing a variable focus liquid crystal lens to improve the above-described problems.
The embodiment of the application can be realized as follows:
a variable focal length liquid crystal lens includes a plurality of liquid crystal devices stacked in order along a first direction. Each liquid crystal device comprises a first substrate and a second substrate which are arranged oppositely, a liquid crystal layer is arranged between the first substrate and the second substrate, a plurality of first electrodes which are electrically insulated from each other are arranged on one side of the first substrate close to the second substrate at intervals, a second electrode is arranged on one side of the second substrate close to the first substrate, the second electrode is a transparent electrode with a plate-shaped structure, and the first electrode and the second electrode are used for providing driving voltage for the liquid crystal layer. The projections of the plurality of first electrodes in each liquid crystal device in a first plane perpendicular to the first direction are concentric rings, the outer diameter sizes of the first electrodes of the plurality of liquid crystal devices sequentially arranged along the first direction are sequentially reduced, and the projections of the first electrodes in any two liquid crystal devices in the first plane do not intersect.
Further, the first electrodes of the plurality of liquid crystal devices sequentially arranged in the first direction are arranged at non-uniform intervals.
Further, any two adjacent concentric rings have a space therebetween.
Further, the plurality of first electrodes in each liquid crystal device are led out to an external driving circuit through the electrode leads in one-to-one correspondence, and the projections of all the electrode leads in the first plane are overlapped.
Further, a side of the first electrode in each liquid crystal device, which is away from the first substrate, is provided with a dielectric layer.
Further, the plurality of first electrodes in each liquid crystal device comprise first electrode layers and second electrode layers which are distributed at intervals along a first direction, and the first electrodes in the first electrode layers and the first electrodes in the second electrode layers are arranged in a staggered mode along a second direction perpendicular to the first direction.
Further, the projection of the first electrode in the first electrode layer in the first plane is a first projection, the projection of the first electrode in the second electrode layer in the first plane is a second projection, and the edge of the first projection is collinear with the edge of the second projection adjacent to the first projection.
Furthermore, a dielectric layer is arranged on one side, away from the first substrate, of the first electrode layer and one side, away from the second substrate, of the second electrode layer.
Further, the first electrode and the second electrode in each liquid crystal device are provided with liquid crystal alignment layers, and the rubbing directions of the liquid crystal alignment layer of the first electrode and the liquid crystal alignment layer of the second electrode are opposite.
Further, the liquid crystal layer in each liquid crystal device includes liquid crystal molecules, long axes of which are aligned in a second direction perpendicular to the first direction.
According to the zoom liquid crystal lens provided by the embodiment of the application, through the arrangement of the multiple layers of liquid crystal devices which are sequentially overlapped, the sizes of the first electrodes of the multiple liquid crystal devices which are sequentially arranged along the first direction are sequentially reduced, the multiple liquid crystal devices can be equivalent to a Fresnel lens after being overlapped, and the thickness of the liquid crystal layer of each liquid crystal device can be made thinner. And applying corresponding driving voltages to the electrodes corresponding to the liquid crystal devices, combining to obtain a phase delay curve similar to a Fresnel lens, and adjusting the driving voltages to adjust the focal length of the variable-focus liquid crystal lens in a larger range. And the response time of the zoom liquid crystal lens can be effectively reduced, and the wide application in the field of virtual reality display is facilitated.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
Fig. 1 is a schematic structural diagram of a variable focus liquid crystal lens provided in an embodiment of the present application;
fig. 2 is a schematic structural diagram of a projection of first electrodes of different liquid crystal devices in a variable-focus liquid crystal lens provided by an embodiment of the present application on a first plane;
fig. 3 is a schematic structural diagram of a variable focus liquid crystal lens provided in an embodiment of the present application when the number of liquid crystal devices is three;
FIG. 4 is a schematic diagram of a zoom liquid crystal lens provided in an embodiment of the present application in an OFF state;
fig. 5 is a schematic diagram of a zoom liquid crystal lens provided in an embodiment of the present application in an ON state;
fig. 6 is a phase distribution diagram of a zoom liquid crystal lens in an ON state according to an embodiment of the present application;
FIG. 7 is a schematic diagram of another structure of a variable focus liquid crystal lens according to an embodiment of the present application;
fig. 8 is a schematic diagram of another structure of a variable focus liquid crystal lens according to an embodiment of the present application.
Icon: 100-zoom liquid crystal lens; 101-a first direction; 103-a second direction; 105-a first plane; 110-a liquid crystal device; 111-a first substrate; 113-a second substrate; 115-a liquid crystal layer; 121-a first electrode; 1210-a first electrode layer; 1215 — a second electrode layer; 125-electrode leads; 131-a second electrode; 133-a dielectric layer; 1330-a first dielectric layer; 1335-second dielectric layer.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
It should be noted that the features of the embodiments of the present application may be combined with each other without conflict.
Fresnel lenses (Fresnel lenses), also known as screw lenses, are mostly sheets made of polyolefin materials by injection molding, and are also made of glass, one surface of the lens is a smooth surface, and the other surface is inscribed with concentric circles from small to large, and the texture of the Fresnel lenses is designed according to the requirements of light interference and interference, relative sensitivity and receiving angle.
Fresnel lenses are simply described as having equidistant indentations on one side of the lens, by means of which indentations a bandpass (reflection or refraction) of light in a given spectral range can be achieved. The working principle is as follows: assuming that the refractive power of a lens occurs only at the optical surface (e.g., lens surface), as much optical material as possible is removed while preserving the curvature of the surface. Another understanding is that the lens continuous surface portion "collapses" to a plane. The surface of the material is composed of a series of sawtooth-shaped grooves when viewed in cross section, and the central part of the material is an elliptic arc. Each groove has a different angle with the adjacent groove, but concentrates the light to a point forming a central focal point, i.e., the focal point of the lens. Each groove can be viewed as a separate lenslet that collimates or concentrates light. The Fresnel zoom liquid crystal lens comprises a first substrate, a second substrate and a liquid crystal layer, wherein the first substrate and the second substrate are arranged up and down, and the liquid crystal layer is positioned between the first substrate and the second substrate. A first electrode is arranged on one side, close to the second substrate, of the first substrate, and a second electrode is arranged on one side, close to the first substrate, of the second substrate. In a three-dimensional cartesian coordinate system, the first electrode includes a plurality of electrodes which have concentric circular rings in the XY plane and are electrically insulated from each other, and the second electrode is an entire ITO or transparent electrode.
The basic principle of the Fresnel zoom liquid crystal lens is as follows: a gradient distribution of refractive index non-uniformities is formed in the liquid crystal layer under the influence of the applied electric field. The corresponding focal length is:
wherein: r in formula (1) is the radius of the liquid crystal lens;
is the birefringence coefficient of the liquid crystal material; and d is the thickness of the liquid crystal layer.
From equation (1) we can derive: for a liquid crystal lens with a certain focal length f, the thickness d of the liquid crystal layer is increased correspondingly as the radius r is increased.
The response time t of the liquid crystal molecules of the liquid crystal layer under the action of the external electric field is proportional to the square of the thickness d of the liquid crystal layer, i.e. the response time t is proportional to the response time
. In addition, for a liquid crystal lens with a larger aperture, in order to realize a shorter focal length f, a larger phase retardation is required, so that the thickness of the liquid crystal layer in the liquid crystal lens is relatively thick. The increase in the thickness of the liquid crystal layer not only increases the difficulty in manufacturing the liquid crystal lens, but also extends the response time of the liquid crystal lens device, and the driving voltage of the first electrode becomes large.
If the liquid crystal lens with the structure is applied to the field of virtual reality display, the response time of the liquid crystal lens needs hundreds of milliseconds or even seconds, the time is slow, and the basic requirement of a display scene refresh rate of 60Hz (16.7 milliseconds) cannot be met in practical application, so that the application of the liquid crystal lens in the field of virtual reality technology is greatly limited.
In order to improve the above problem, embodiments of the present application provide a fast-zooming liquid crystal lens.
Referring to fig. 1, the variable focal length liquid crystal lens 100 may include a plurality of liquid crystal devices 110 sequentially stacked along a first direction 101.
Each of the liquid crystal devices 110 may include a first substrate 111 and a second substrate 113 disposed opposite to each other, and a liquid crystal layer 115 is disposed between the first substrate 111 and the second substrate 113.
A plurality of first electrodes 121 are disposed at intervals on one side of the first substrate 111 close to the second substrate 113, and any two adjacent first electrodes 121 are electrically insulated from each other.
A second electrode 131 is disposed on a side of the second substrate 113 close to the first substrate 111, and the second electrode 131 may be a transparent electrode. Projections of the plurality of first electrodes 121 in each liquid crystal device 110 in the first plane 105 perpendicular to the first direction 101 are concentric circles (see fig. 2).
Alternatively, the plurality of liquid crystal devices 110 are sequentially stacked along the first direction 101, the number of the first electrodes 121 in each liquid crystal device 110 may be multiple, and the projections of the plurality of first electrodes 121 in the first plane 105 are concentric circles. Here, the first plane 105 refers to a plane perpendicular to the first direction 101. The outer diameter sizes of the first electrodes 121 of the plurality of liquid crystal devices 110 sequentially arranged along the first direction 101 are sequentially reduced, and the projections of the first electrodes 121 on the first plane 105 in any two adjacent liquid crystal devices 110 do not intersect.
Referring to fig. 2, the liquid crystal devices 110 arranged along the first direction 101 have the projection ranges of the first electrodes 121 on the first plane 105 sequentially distributed from large to small. In other words, along the first direction 101, the inner diameter size of the projection of the respective plurality of first electrodes 121 in the first plane 105 for all the liquid crystal devices 110 decreases sequentially. The first electrodes 121 of the plurality of liquid crystal devices 110 sequentially arranged in the first direction 101 are arranged at non-uniform intervals.
Further, the liquid crystal layer 115 in each liquid crystal device 110 includes liquid crystal molecules, the long axes of which are aligned in the second direction 103 perpendicular to the first direction 101 as shown in fig. 1.
The first electrode 121 and the second electrode 131 in each liquid crystal device 110 are provided with a liquid crystal alignment layer (not shown in the drawings). In the same liquid crystal device 110, the rubbing directions of the liquid crystal alignment layer of the first electrode 121 and the liquid crystal alignment layer of the second electrode 131 are opposite and antiparallel to each other.
Further, the liquid crystal layer 115 in each liquid crystal device 110 is a positive liquid crystal.
Referring to fig. 2, in the three-dimensional cartesian coordinate system, the first direction 101 is a Z-axis direction, the first plane 105 is a plane in which XOY is located, and the second direction 103 is an X-axis direction.
In the plurality of liquid crystal devices 110 sequentially stacked in the first direction 101, projections of the first electrodes 121 in any two of the liquid crystal devices 110 in the first plane 105 perpendicular to the first direction 101 do not intersect.
It is understood that the projection of any one of the first electrodes 121 on the first plane 105 is a circular ring, the first electrodes 121 on all the liquid crystal devices 110 are circular rings with different diameters concentrically after being projected on the first plane 105, the outer diameter of the first electrodes 121 on the plurality of liquid crystal devices 110 stacked along the first direction 101 decreases sequentially, and the first electrodes 121 in the plurality of liquid crystal devices 110 are spaced in a non-uniform manner.
It should be noted that the term "do not intersect" here means that the circles formed by the projections of any two first electrodes 121 in the first plane 105 do not overlap partially or completely. But does not include two adjacent rings, wherein the inner diameter of one ring is the same as the outer diameter of the other ring. That is, in two adjacent circular rings, the inner circular edge of one circular ring and the outer circular edge of the other circular ring may coincide with each other.
The first electrode 121 and the second electrode 131 in each liquid crystal device 110 are used for providing a driving voltage for the liquid crystal layer 115 in the same liquid crystal device 110, so as to control the on or off of the liquid crystal device 110.
With reference to fig. 2, the first electrodes 121 in each liquid crystal device 110 are led out to the external driving circuit through the electrode leads 125 corresponding to one, and the led-out positions of the electrode leads 125 corresponding to the first electrodes 121 in the same liquid crystal device 110 are substantially the same.
The electrode leads 125 in each liquid crystal device 110 are projected in a first plane 105 perpendicular to the first direction 101, the resulting lead projections being substantially coincident so that the positions of all electrode leads 125 in the variable focus liquid crystal lens 100 are substantially the same. The second electrode 131 in each liquid crystal device 110 is grounded.
Since the electrode leads 125 in different liquid crystal devices 110 are distributed on different layers, the variable focus liquid crystal lens 100 with the structure can effectively reduce the space occupied by the electrode leads 125 and reduce the influence of the electrode leads 125 on the gradient voltage.
With reference to fig. 1 and fig. 2, the plurality of first electrodes 121 in the same liquid crystal device 110 are disposed at intervals, and after the first electrodes 121 in the liquid crystal devices 110 of different layers are projected in the first plane 105, the positions of the formed circular rings are different and are arranged at intervals in sequence. For example, in the viewing angle of fig. 2, after the first electrodes 121 in all the liquid crystal devices 110 are projected on the first plane 105, a plurality of concentric rings are formed, and any two adjacent concentric rings are spaced apart from each other, so that a space is formed between any two adjacent concentric rings.
It is understood that the variable focus liquid crystal lens 100 provided in the embodiments of the present application includes a plurality of liquid crystal devices 110. As shown in fig. 1, the plurality of liquid crystal devices are sequentially arranged along the first direction, the plurality of first electrodes in each liquid crystal device are sequentially and adjacently sleeved, and the projection sizes of the formed electrode groups on the first plane are distributed from large to small. The specific number of the liquid crystal devices 110 is not limited, and may be two or more, depending on the actual requirement. The following description will be made in detail by taking three liquid crystal devices 110 as an example, as shown in fig. 3.
The three liquid crystal devices 110 are sequentially stacked in the Z-axis direction, the first electrodes 121 of each liquid crystal device 110 are electrically insulated from each other, and the second electrode 131 is a transparent electrode having a full-surface structure. The liquid crystal layer 115 in each liquid crystal device 110 may be the same liquid crystal material or may be a different liquid crystal material.
Since the first electrode 121 and the second electrode 131 in each liquid crystal device 110 are provided with the liquid crystal alignment layer thereon, and the liquid crystal alignment layer of the first electrode 121 and the liquid crystal alignment layer of the second electrode 131 in the same liquid crystal device 110 are arranged with the rubbing directions thereof being antiparallel. When the rubbing directions of the liquid crystal alignment layers on all the liquid crystal devices 110 are projected on the first plane 105, the resultant projections are collinear, for example, the projections are all in the second direction 103.
As shown in fig. 2, the first electrodes 121 of the three liquid crystal devices 110 are projected on the first plane 105 to form a plurality of concentric rings, and any two adjacent rings are divided at a certain interval. The number of the first electrodes 121 is the same as that of the electrode leads 125, and the first electrodes 121 are led out to an external driving circuit through the corresponding electrode leads 125.
Optionally, the electrode leads 125 in the three liquid crystal devices 110 are respectively projected on the first plane 105, the formed lines are substantially overlapped, and by arranging the multiple layers of liquid crystal devices 110, the space occupied by the electrode leads 125 can be effectively reduced, thereby being beneficial to reducing the influence of the electrode leads 125 on the gradient voltage.
The working principle of the zoom liquid crystal lens 100 provided by the embodiment of the application is as follows:
as shown in fig. 4, when the variable focus liquid crystal lens 100 is in the OFF state, the first electrode 121 in each liquid crystal device 110 is in the OFF state, i.e., no voltage is applied. The liquid crystal molecules of the liquid crystal layer 115 maintain the initial orientation shown in fig. 4, i.e., the long axes of the liquid crystal molecules of the liquid crystal layer 115 are horizontally aligned in the second direction 103.
When linearly polarized incident light along the Z axis in the XOZ plane passes through the variable focal length liquid crystal lens 100, no phase delay occurs, and the incident natural light is not converged, and at this time, the focal point is at infinity.
Referring to fig. 5 and 6, when the variable focus liquid crystal lens 100 is in the ON state, all the first electrodes 121 of the liquid crystal devices 110 are powered ON, and the second electrodes 131 are grounded.
A certain driving voltage is applied between the first electrode 121 and the second electrode 131 through the electrode lead 125, so that the variable focus liquid crystal lens 100 generates a phase distribution as shown in fig. 6.
Linearly polarized light incident along the Z axis in the XOZ plane converges to the position of the focal point F as it passes through the variable focus liquid crystal lens 100.
In addition, the position of the focus can be adjusted by adjusting the driving voltage applied between the first electrode 121 and the second electrode 131. In other words, the refractive performance of the zoom liquid crystal lens 100 can be controlled by adjusting the driving voltage, which is different from one another.
In the variable-focus liquid crystal lens 100 provided in the embodiment of the present application, multiple layers of liquid crystal devices 110 stacked in sequence are arranged, and corresponding driving voltages are applied to electrodes corresponding to the liquid crystal devices 110, so as to obtain a phase retardation curve similar to a fresnel lens after combination. Then, by adjusting the driving voltage, the focal length adjustment of the zoom liquid crystal lens 100 in a wide range can be achieved. In addition, by adopting a plurality of liquid crystal devices 110, the thickness of the liquid crystal layer 115 of each liquid crystal device 110 can be made thinner, so that the response time of the zoom liquid crystal lens 100 is effectively reduced, and the zoom liquid crystal lens is beneficial to being widely applied to the field of virtual reality display.
As another embodiment, as shown in fig. 7, when the first electrodes 121 of each liquid crystal device 110 are spaced apart from each other, in order to reduce the influence of the horizontal electric field between two adjacent first electrodes 121 on the gradient electric field in the vertical direction, a dielectric layer 133 may be disposed on a side of the first electrode 121 of each liquid crystal device 110 away from the first substrate 111, so as to form a gradient electric field with a desired distribution in the liquid crystal layer 115.
As another embodiment, as shown in fig. 8, the first electrode 121 in each liquid crystal device 110 is provided as a double-layer structure, i.e., the plurality of first electrodes 121 in each liquid crystal device 110 are spaced apart along the first direction 101 into a first electrode layer 1210 and a second electrode layer 1215, and the first electrode layer 1210 and the second electrode layer 1215 are spaced apart along the first direction 101.
In the second direction 103 perpendicular to the first direction 101, the first electrodes 121 in the first electrode layer 1210 are staggered with the first electrodes 121 in the second electrode layer 1215, so that the first electrodes 121 in the first electrode layer 1210 project on the first plane 105, and the first electrodes 121 in the second electrode layer 1215 project on the first plane 105 without overlapping.
Optionally, the projection of the first electrode 121 in the first electrode layer 1210 in the first plane 105 is a first projection, the projection of the first electrode 121 in the second electrode layer 1215 in the first plane 105 is a second projection, and the edge of the first projection is collinear with the edge of the second projection adjacent to the first projection. In other words, the separation between the first projection and the second projection is zero.
Further, in this embodiment, a dielectric layer 133 may also be disposed, and when the first electrode 121 is designed to be a double-layer structure, the dielectric layer 133 is also two layers, i.e., a first dielectric layer 1330 and a second dielectric layer 1335, and the first dielectric layer 1330 corresponds to the first electrode layer 1210 and the second dielectric layer 1335 corresponds to the second electrode layer 1215.
The first dielectric layer 1330 and the second dielectric layer 1335 are respectively disposed on one side of the first electrode 121 of the two-layer structure close to the liquid crystal layer 115.
As shown in fig. 8, the first dielectric layer 1330 is located on the side of the first electrode layer 1210 away from the first substrate 111, the second electrode layer 1215 is located on the side of the first dielectric layer 1330 away from the first substrate 111, and the second dielectric layer 1335 is located on the side of the second electrode layer 1215 away from the first substrate 111.
In the variable focus liquid crystal lens 100 provided in this embodiment, when the first electrode 121 in each liquid crystal device 110 is divided into a two-layer structure, and the projection of the first electrode 121 in the first electrode layer 1210 in the first plane 105 is separated from the projection of the first electrode 121 in the second electrode layer 1215 in the first plane 105 by a distance of zero, so that the first electrode 121 in the first electrode layer 1210 and the second electrode 131 in the second electrode layer 1215 are separated by a distance of zero in the second direction 103, the number of the first electrodes 121 can be increased, and the distribution of the electric field gradient is optimized by increasing the number of the first electrodes 121, thereby achieving a better lens effect.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not necessarily depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (10)
1. A zoom liquid crystal lens includes a plurality of liquid crystal devices sequentially stacked in a first direction;
each liquid crystal device comprises a first substrate and a second substrate which are arranged oppositely, a liquid crystal layer is arranged between the first substrate and the second substrate, a plurality of first electrodes which are electrically insulated from each other are arranged on one side of the first substrate close to the second substrate at intervals, a second electrode is arranged on one side of the second substrate close to the first substrate, the second electrode is a transparent electrode on the whole surface, and the first electrode and the second electrode are used for providing driving voltage for the liquid crystal layer;
the projections of the plurality of first electrodes in each liquid crystal device in a first plane perpendicular to the first direction are concentric rings, the outer diameter sizes of the first electrodes of the plurality of liquid crystal devices sequentially arranged along the first direction are sequentially reduced, and the projections of the first electrodes in any two liquid crystal devices in the first plane do not intersect.
2. The variable focus liquid crystal lens as claimed in claim 1, wherein the first electrodes of the plurality of liquid crystal devices sequentially arranged in the first direction are arranged at non-uniform intervals.
3. The variable focus liquid crystal lens of claim 1, wherein any two adjacent concentric rings have a pitch therebetween.
4. The variable focus liquid crystal lens according to claim 1, wherein said plurality of first electrodes in each of said liquid crystal devices are led out to an external driving circuit through one-to-one corresponding electrode leads, and projections of all said electrode leads in said first plane coincide.
5. Zoom liquid crystal lens according to claim 1, characterized in that the side of the first electrode in each of the liquid crystal devices facing away from the first substrate is provided with a dielectric layer.
6. The variable focus liquid crystal lens of claim 1, wherein the plurality of first electrodes in each of the liquid crystal devices comprises first and second electrode layers spaced apart along the first direction, and the first electrodes in the first electrode layers are interleaved with the first electrodes in the second electrode layers along a second direction perpendicular to the first direction.
7. Zoom liquid crystal lens according to claim 6, wherein the projection of the first electrode in the first electrode layer in the first plane is a first projection, the projection of the first electrode in the second electrode layer in the first plane is a second projection, and an edge of the first projection is collinear with an edge of the second projection adjacent thereto.
8. Zoom liquid crystal lens according to claim 6, characterized in that the sides of the first and second electrode layers remote from the first substrate are further provided with a dielectric layer.
9. Zoom liquid crystal lens according to claim 1, characterized in that the first electrode and the second electrode in each liquid crystal device are provided with liquid crystal alignment layers, the rubbing directions of the liquid crystal alignment layers of the first electrode and the liquid crystal alignment layers of the second electrode being opposite.
10. A variable focus liquid crystal lens as claimed in any one of claims 1 to 9, wherein said liquid crystal layer in each of said liquid crystal devices comprises liquid crystal molecules having long axes aligned in a second direction perpendicular to said first direction.
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| CN112445014B (en) * | 2020-12-08 | 2022-07-01 | 厦门天马微电子有限公司 | Display module and display device |
| CN113514974B (en) * | 2021-04-19 | 2022-07-08 | 南昌虚拟现实研究院股份有限公司 | Liquid crystal lens zooming processing method and system |
| CN113514988B (en) * | 2021-04-28 | 2022-09-13 | 南昌虚拟现实研究院股份有限公司 | Zoom liquid crystal lens and driving method thereof |
| CN114035250A (en) * | 2021-11-29 | 2022-02-11 | 南昌虚拟现实研究院股份有限公司 | Zoom liquid crystal lens, driving method and display device |
| CN115236904B (en) * | 2022-08-02 | 2024-03-19 | 联创电子科技股份有限公司 | Liquid crystal lens unit, liquid crystal lens device and manufacturing method |
| CN115981058A (en) * | 2023-02-16 | 2023-04-18 | 联创电子科技股份有限公司 | Liquid crystal lens and preparation method thereof |
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| JPH06130351A (en) * | 1992-10-19 | 1994-05-13 | Toyota Motor Corp | Liquid crystal lens |
| CN1141601C (en) * | 2001-08-14 | 2004-03-10 | 中国科学院长春光学精密机械与物理研究所 | Continuous vari-focus Fresnel lens |
| JP5328315B2 (en) * | 2008-11-25 | 2013-10-30 | シチズンホールディングス株式会社 | Variable focus lens |
| CN203433171U (en) * | 2013-08-21 | 2014-02-12 | 信利光电股份有限公司 | Zoom lens and camera module |
| WO2017197533A1 (en) * | 2016-05-20 | 2017-11-23 | Lensvector Inc. | Flat liquid crystal layered fresnel lens device |
| CN105842888A (en) * | 2016-05-31 | 2016-08-10 | 成都微晶景泰科技有限公司 | Quick focusing optical element and imaging device |
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