CN111913319A

CN111913319A - Liquid crystal lens with circular ring electrode

Info

Publication number: CN111913319A
Application number: CN202010961389.1A
Authority: CN
Inventors: 苏树钊; 姜海明; 谢康; 唐常钦
Original assignee: Guangdong University of Technology
Current assignee: Guangdong University of Technology
Priority date: 2020-09-14
Filing date: 2020-09-14
Publication date: 2020-11-10

Abstract

The application discloses a circular ring electrode liquid crystal lens, wherein a circular ring inner ring of the circular ring electrode liquid crystal lens is provided with a chamfer to form a chamfer part; the chamfer part is uniformly increased in thickness along the direction from the inner ring to the outer ring of the circular ring electrode liquid crystal lens. This application carries out edge optimization through the mode to ring electrode liquid crystal lens inner circle through the chamfer, has reduced ring inner circle size sudden change, improves the voltage fluctuation problem at lens edge, makes liquid crystal lens's center more even to the transition of the liquid crystal molecule director at edge, and the formation of image more is close traditional solid state lens.

Description

Liquid crystal lens with circular ring electrode

Technical Field

The application relates to the field of zoom lenses, in particular to a circular ring electrode liquid crystal lens.

Background

With the development of the image field of the society, the lens plays an increasingly important role; the imaging quality, portability and zoom of lenses are explored in many fields, such as the medical field, the laser field, the film and television field. Compared with the traditional non-variable lens, the variable-focus lens has higher research value; this is because the variable focus lens can adapt to the scene with changing requirements for the focal length of the lens, such as the glasses worn by the people with myopia in daily life, the lens will slowly harden with the age, the ciliary muscle can not adjust the structure of the lens sufficiently, and the variable focus glasses have research value. While still using a fixed focus lens in a scene requiring a change in focal plane tends to require mechanical structure to drive, which increases the complexity of the system without doubt.

The structure of the annular electrode liquid crystal lens is respectively as follows from top to bottom: the liquid crystal display panel comprises an upper glass carrier, an upper plane electrode, an upper polyimide film, a liquid crystal layer, a lower polyimide film, a lower ring electrode and a lower glass carrier, wherein when a certain voltage is formed by the upper electrode and the lower electrode, liquid crystal molecules are distributed in a gradient manner; the conventional circular ring electrode liquid crystal lens is shown in fig. 2, when the voltage difference between the upper plane electrode and the lower circular ring electrode is 3V, the cross section of the liquid crystal molecular structure is shown in fig. 3, and the electrode transition is not uniform and color blocks with different depths can be seen from the top to the bottom in the seventh row; the position and voltage curve obtained by analyzing the depth difference is shown in fig. 4, and it can be seen from the frame selection area that voltage fluctuation occurs at the edge of the lens, that is, around the abscissa 45um and 125 um; the graph of the liquid crystal layer position and the director of the liquid crystal molecules is shown in fig. 5, and it can be seen from the frame selection area that the directors of the liquid crystal molecules obviously fluctuate around the abscissa of 45um and 125 um. The ideal state of the director curve of the liquid crystal molecules is a parabolic curve, and the fluctuation of the curve will affect the imaging of the lens.

For this reason, it can be seen that there are problems that the voltage fluctuation and the liquid crystal molecular director fluctuation at the edge of the conventional lens affect the imaging quality of the liquid crystal lens.

Disclosure of Invention

In view of the above, an object of the present invention is to provide a circular ring electrode liquid crystal lens, which can improve the problem of voltage fluctuation of the lens, reduce the fluctuation of director of liquid crystal molecules of the lens, make the position of the lens and the director curve closer to a curve similar to a parabola, and improve the imaging quality of the liquid crystal lens.

In order to achieve the technical purpose, the application provides a circular ring electrode liquid crystal lens, wherein a circular ring inner ring of the circular ring electrode liquid crystal lens is provided with a chamfer to form a chamfer part;

the chamfer part is uniformly increased in thickness along the direction from the inner ring to the outer ring of the circular ring electrode liquid crystal lens.

Preferably, the chamfer is arranged on the upper edge of the circular ring and extends to the lower edge of the circular ring.

Preferably, the chamfer is embodied as a chamfer.

Preferably, the chamfer angle is 10 ° to 30 °.

Preferably, the chamfer angle is 14 °.

According to the technical scheme, the chamfer is arranged on the inner ring of the annular electrode liquid crystal lens, so that the thickness of the center of the electrode to the outer edge of the electrode is uniformly changed without sudden change, the electrode can form a good electric field, the position of the lens and the director curve are closer to the curve of a quasi-parabola, and the imaging quality of the liquid crystal lens is improved.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.

FIG. 1 is a schematic view of a liquid crystal lens with a circular ring electrode provided in the present application;

FIG. 2 is a schematic diagram of a conventional circular ring electrode liquid crystal lens;

FIG. 3 is a cross-sectional view of a liquid crystal molecule structure when a 3V voltage difference exists between the upper and lower electrodes of a conventional circular ring electrode liquid crystal lens;

FIG. 4 is a graph of conventional ring electrode liquid crystal lens position versus voltage;

FIG. 5 is a graph of the liquid crystal layer position and the liquid crystal molecular director of a conventional circular ring electrode liquid crystal lens;

FIG. 6 is a cross-sectional view of a liquid crystal molecule structure when a difference of 3V is present between upper and lower electrodes of a circular electrode liquid crystal lens provided in the present application;

FIG. 7 is a graph of liquid crystal lens position versus voltage for a ring electrode as provided herein;

FIG. 8 is a graph of the liquid crystal layer position and the liquid crystal molecular director of a circular ring electrode liquid crystal lens provided in the present application;

fig. 9 is a schematic diagram of an included angle of an upper chamfer on a longitudinal section of a circular ring electrode liquid crystal lens provided in the present application.

In the figure: 1. a glass carrier is arranged; 2. an upper planar electrode; 3. applying a polyimide film; 4. a liquid crystal layer; 5. a lower polyimide film; 6. a lower ring electrode; 7. a lower glass carrier; 8. chamfering the corner; 9. a circular ring electrode liquid crystal lens; 10. conventional circular ring electrode liquid crystal lenses.

Detailed Description

The technical solutions of the embodiments of the present application will be described clearly and completely with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without any creative effort belong to the protection scope of the embodiments in the present application.

In the description of the embodiments of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the embodiments of the present application and simplifying the description, but do not indicate or imply that the referred devices or elements must have specific orientations, be configured in specific orientations, and operate, and thus, should not be construed as limiting the embodiments of the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the embodiments of the present application, it should be noted that the terms "mounted," "connected," and "connected" are used broadly and are defined as, for example, a fixed connection, an exchangeable connection, an integrated connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection through an intermediate medium, and a communication between two elements, unless otherwise explicitly stated or limited. Specific meanings of the above terms in the embodiments of the present application can be understood in specific cases by those of ordinary skill in the art.

The embodiment of the application discloses a liquid crystal lens with a circular ring electrode.

Referring to fig. 1 to 9, one embodiment provided in the embodiments of the present application includes: a ring electrode liquid crystal lens, the ring inner circle of the liquid crystal lens of ring electrode 9 has chamfers, form the chamfered portion 8; the chamfered portion 8 increases in thickness uniformly in the direction from the inner ring to the outer ring of the ring electrode liquid crystal lens 9.

Due to the design of the chamfer of the inner ring of the annular electrode liquid crystal lens, the thickness of the annular electrode liquid crystal lens is gradually increased in the chamfer range from the inner ring to the outer ring, so that the problem of voltage fluctuation caused by size mutation is avoided; referring to fig. 6, the cross-sectional view of the liquid crystal molecule structure of the conventional circular ring electrode liquid crystal lens 10 shown in fig. 3 is the same, from top to bottom: 1. a glass carrier is arranged; 2. an upper planar electrode; 3. applying a polyimide film; 4. a liquid crystal layer; 5. a lower polyimide film; 6. a lower ring electrode; 7. a lower glass carrier; similarly, under the condition that the pressure difference between the upper electrode and the lower electrode is 3V, color blocks with different depths in the liquid crystal layer 4 of the annular electrode liquid crystal lens 9 provided by the application are obviously reduced, and the electrode transition is more uniform; referring to fig. 7, in comparison with the conventional circular ring electrode liquid crystal lens 10 shown in fig. 4, the position and voltage curve of the lens edge, i.e., the abscissa of about 45um and 125um, has no obvious fluctuation in voltage; referring to fig. 8, in comparison with the conventional circular ring electrode liquid crystal lens 10 shown in fig. 5, in which the liquid crystal layer position and the liquid crystal molecular director curve are plotted, at the edge of the lens, i.e., about the abscissa 45um and 125um, the fluctuation of the director curve of the liquid crystal molecules is significantly slowed, no fluctuation or disorder occurs, the curve transition is smooth, and the curve is closer to a parabolic curve.

It should be noted that the X direction in the subscript "X direction position of lens" in fig. 4 specifically refers to the horizontal direction of the cross section of the liquid crystal molecular structure in fig. 3, as indicated by the X direction in fig. 3; similarly, the X direction in the subscript "X direction position of lens" in fig. 7 specifically refers to the horizontal direction of the cross section of the liquid crystal molecular structure in fig. 6, as indicated by the X direction in fig. 6.

Specifically, the chamfer may be provided on one end surface of the circular ring electrode liquid crystal lens 9 and extend to the other end surface; or the inner rings of the two end faces of the circular electrode liquid crystal lens 9 are both provided with chamfers to form two chamfer parts, the edges of the two chamfer parts are superposed to make the inner rings of the circular electrodes form a cone angle, and the chamfers of the inner rings of the two end faces can be set to be the same size or different sizes; or the wall surface of the inner ring of the annular electrode liquid crystal lens 9 is concave towards the direction of the outer ring, such as an inner groove; specifically, the thickness of the annular electrode liquid crystal lens 9 is uniformly increased from the inner ring of the annular electrode to the outer ring of the annular electrode liquid crystal lens within the range of the chamfer part without limitation.

The above is the first embodiment provided in the present application, and the following is the second embodiment provided in the present application, please refer to fig. 1 to 8 specifically

A ring electrode liquid crystal lens, the ring inner circle of the liquid crystal lens of ring electrode 9 has chamfers, form the chamfered portion 8; the chamfered portion 8 increases in thickness uniformly in the direction from the inner ring to the outer ring of the ring electrode liquid crystal lens 9.

Furthermore, the chamfer is arranged on the upper edge of the inner ring of the circular ring and extends to the lower edge of the inner ring of the circular ring.

Specifically, the upper edge and the lower edge of the inner ring of the ring refer to the edges of the inner ring of the two end faces of the ring, the ring electrode liquid crystal lens is made of a transparent material, and the front face and the back face of the liquid crystal lens are not divided into the upper face and the lower face in actual use.

Further, the chamfer is specifically a chamfer angle.

Specifically, the chamfer angle can be a chamfer angle or a fillet angle, and an arc formed by the fillet angle can be an inward arc or an outward arc, so that the thickness of the inner ring of the ring can be uniformly changed; in this embodiment, the chamfer is a planar chamfer.

Further, the chamfer angle is 10 ° to 30 °.

Specifically, referring to fig. 9, the chamfer angle is an included angle between an inclined surface of the inner ring of the circular ring and an end surface of the circular ring, and is denoted by a, and experiments prove that when a is greater than or equal to 10 degrees and less than or equal to 30 degrees, compared with the conventional circular electrode liquid crystal lens 10, the experimental effect of electrode transition, voltage fluctuation and fluctuation of a director curve of liquid crystal molecules can be obviously improved.

Preferably, the chamfer angle x is 14 °, and when x is 14 °, the experimental effect is most desirable.

This application optimizes the inward flange state of round hole electrode on conventional round hole electrode liquid crystal lens 10's basis, promptly through cutting modes such as chamfer or radian processing to the inward flange, reduces the unnatural problem of interior edge department electrode transition, improves the voltage fluctuation problem of lens edge, makes liquid crystal lens's center more even to the transition of the liquid crystal molecule director at edge, and the formation of image more is close traditional solid state lens.

It should be noted that the above-mentioned embodiments are only preferred embodiments of the present application, and not intended to limit the present invention, and although the present application has been described in detail with reference to the examples, it will be apparent to those skilled in the art that modifications can be made to the technical solutions described in the foregoing examples, or equivalent substitutions of some technical features can be made, any modifications, equivalents, improvements, etc. within the spirit and principle of the present application shall be included in the scope of the present application.

Claims

1. A circular ring electrode liquid crystal lens is characterized in that a circular ring inner ring of the circular ring electrode liquid crystal lens is provided with a chamfer to form a chamfer part;

2. The ring electrode liquid crystal lens of claim 1, wherein the chamfer is disposed at an upper edge of the ring inner ring and extends to a lower edge of the ring inner ring.

3. The circular ring electrode liquid crystal lens of claim 2, wherein the chamfer is specifically a chamfer.

4. The circular ring electrode liquid crystal lens as claimed in claim 3, wherein the chamfer angle is 10 ° to 30 °.

5. The ring electrode liquid crystal lens of claim 4, wherein the chamfer angle is 14 °.