CN115167058A - Variable-focus liquid crystal molecular lens - Google Patents
Variable-focus liquid crystal molecular lens Download PDFInfo
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- CN115167058A CN115167058A CN202210721406.3A CN202210721406A CN115167058A CN 115167058 A CN115167058 A CN 115167058A CN 202210721406 A CN202210721406 A CN 202210721406A CN 115167058 A CN115167058 A CN 115167058A
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- liquid crystal
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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
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/017—Head mounted
- G02B27/0172—Head mounted characterised by optical features
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Abstract
本发明公开了一种可变焦液晶分子透镜，属于显示技术领域。包括液晶分子，不通电压条件下，液晶分子是一种聚合物，绝大多数液晶分子形状呈细长棒状，存在电学各向异性；在外加电场作用下，液晶分子的长轴朝着平行于电力线的方向旋转，且液晶分子的旋转程度与电场强度大小相关。将常规折射光学元件与多层衍射液晶分子材料形成色散互补，最终消除色散。与现有技术相比，本申请通过两端加电压的方式，有规律的改变液晶分子的排布，所施加电压不同，液晶分子偏转角度不同，电压方向不同，液晶分子偏转顺逆时钟方向不同。这样使得VR透镜变焦速度更快，变焦范围更广，解决了传统透镜重质量、大体积的问题。
The invention discloses a variable-focus liquid crystal molecular lens, which belongs to the technical field of display. Including liquid crystal molecules, under the condition of no voltage, the liquid crystal molecule is a kind of polymer, most of the liquid crystal molecules are slender rod-shaped, and have electrical anisotropy; under the action of an external electric field, the long axis of the liquid crystal molecule is parallel to the electric force line. The direction of rotation of the liquid crystal molecules is related to the strength of the electric field. The conventional refractive optical element and the multi-layer diffractive liquid crystal molecular material form dispersion complementation, and finally eliminate the dispersion. Compared with the prior art, the present application regularly changes the arrangement of liquid crystal molecules by applying voltages at both ends. The applied voltages are different, the deflection angles of the liquid crystal molecules are different, the voltage directions are different, and the liquid crystal molecules are deflected in different clockwise and counterclockwise directions. . In this way, the zoom speed of the VR lens is faster and the zoom range is wider, which solves the problems of heavy weight and large volume of traditional lenses.
Description
Technical Field
The invention relates to the technical field of display, in particular to a variable-focus liquid crystal molecular lens.
Background
The traditional VR display device generally adopts a lens stack mode, and the displayed picture is not distorted, and the view field angle is large enough. Nowadays, people are increasingly pursuing light experience with small volume and light weight, so that the traditional stacked lens can not meet the requirements of people. On the basis of the prior art, people put forward a Fresnel lens, try to replace the traditional stacked lens by the light and thin characteristic of the Fresnel lens, certainly, the Fresnel display has own defects, the range of visual angles provided by the Fresnel display is not wide than that of the stacked lens, barrel-shaped distortion and pillow-shaped distortion exist, a dispersion phenomenon also occurs, and aiming at the problems, a program needs to be programmed and software needs to be used for pre-deformation processing. Aiming at the problem of the pain points, a variable-focus liquid crystal molecular lens is adopted, appropriate voltage is applied to liquid crystal, an appropriate angle is deflected, and a refractive-diffractive optical system is utilized to construct an appropriate optical system, so that the final purposes of large visual angle, light weight and dispersion elimination are achieved.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a variable-focus liquid crystal molecular lens.
In the prior art, for the lens combination, the distance between the eyepiece and the objective lens is changed to realize the adjustment of the optical path. For the fresnel lens, a plurality of small convex lens structures are made on one lens to process incident light, so that the curvature and the focal length of each small convex lens have corresponding requirements, and the lens processing process has higher requirements and higher cost. In view of the above-mentioned disadvantages, the present invention proposes a solution to achieve a good optical effect by using the anisotropy of liquid crystal molecules and applying a voltage to make them appear in a micro-convex lens array state.
The purpose of the invention can be realized by the following technical scheme: a variable-focus liquid crystal molecular lens comprises a liquid crystal molecular lens, wherein under the condition of no applied voltage, liquid crystal molecules are a polymer, and most of the liquid crystal molecules are in a slender rod shape and have electrical anisotropy; under the action of an applied electric field, the long axes of the liquid crystal molecules rotate in a direction parallel to the electric field lines, and the rotation degree of the liquid crystal molecules is related to the intensity of the electric field.
Furthermore, the liquid crystal molecular lens changes the spatial arrangement of liquid crystal molecules in a voltage changing mode; finally, the propagation path of the light is changed, and the purpose of zooming is achieved.
Furthermore, the liquid crystal molecular lens has a large field of view, and the number of layers of the lens needs to be increased; the larger the number of lens layers, the slower the switching speed, the use of multilayer liquid crystal molecular lenses, the faster the switching speed of thinner multilayer lenses, and the ability to provide more options than a single lens of greater thickness. The switching focusing speed is related to the thickness degree of the lens, and if the thickness degree is ten times lower, the switching speed of the lens is improved by about 100 times
For the dispersion problem caused by the fact that light rays pass through a lens in the traditional scheme, the dispersion problem is solved by the refraction and diffraction hybrid imaging optical system.
Furthermore, when light passes through the lens, dispersion is caused, the light passes through the conventional refractive optical element, and due to the existence of the dispersion, the sequential color distribution is sequentially from inside to outside, namely, blue, green and red.
Furthermore, when light passes through the multilayer diffraction optical element, the diffraction element in the imaging system reverses the dispersion sequence to red, green and blue.
Further, the conventional refractive optical element and the multilayer diffraction liquid crystal molecular material form dispersion complementation, and finally the dispersion is eliminated.
Further, the diffraction element is made of a special optical material having a negative abbe constant.
The invention has the beneficial effects that:
this patent is based on the shortcoming that traditional lens combination volume, quality are big, through the mode that both ends add voltage, regular change liquid crystal molecule arranges, and the applied voltage is different, and liquid crystal molecule deflection angle is different, and the voltage direction is different, and the liquid crystal molecule deflects that the clockwise or anticlockwise clock direction is different. Therefore, the VR lens has higher zooming speed and wider zooming range, and the problems of heavy mass and large volume of the traditional lens are solved.
The number of the liquid crystal molecular lenses can be reasonably increased or reduced according to the thickness requirement of the lens, the optical visual angle can be reasonably controlled, and the balance is sought in the aspects of switching speed and visual angle.
Aiming at the dispersion problem of the traditional lens, the invention provides a refraction and diffraction optical system, namely, a diffraction element is added on the basis of the traditional optical element (convex lens), and the dispersion is eliminated.
Drawings
The invention will be further described with reference to the accompanying drawings.
FIG. 1 is a diagram of a conventional refractive optical element of the present application
FIG. 2 is a diagram of a multilayer diffractive optical element of the present application
FIG. 3 is a combination of a refractive optical element and a multilayer diffractive optical element according to the present application
FIG. 4 is a schematic diagram showing the regular arrangement of liquid crystal molecules in the absence of applied voltage according to the present application
FIG. 5 is a diagram illustrating the liquid crystal molecule deflection under the applied voltage
FIG. 6 is a layout of liquid crystal molecules in different voltage regions according to the present application
FIG. 7 is a diagram of a liquid crystal molecular lens assembly in VR of the present application
Fig. 8 is a diagram of a VR lens base structure of the present application.
The parts corresponding to the reference numerals in the figures are as follows: 101. a display; 102. a first lens; 103. a quarter wave plate; 104. a variable focus liquid crystal molecular lens; 105. a polarizing beam splitter; 106. a second lens 106.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A variable-focus liquid crystal molecular lens comprises liquid crystal molecules, wherein the liquid crystal molecules are polymers under the condition of no voltage, most of the liquid crystal molecules are in a slender rod shape, and have electrical anisotropy; under the action of an applied electric field, the long axes of the liquid crystal molecules rotate in a direction parallel to the electric field lines, and the rotation degree of the liquid crystal molecules is related to the intensity of the electric field.
Furthermore, the spatial arrangement of the liquid crystal molecules is changed by changing the voltage of the liquid crystal molecules; finally, the propagation path of the light is changed, and the purpose of zooming is achieved.
Furthermore, the molecular lens has a large field of view, and the number of layers of the lens needs to be increased; the larger the number of lens layers, the slower the switching speed, the use of multilayer liquid crystal molecular lenses, the faster the switching speed of thinner multilayer lenses, and the ability to provide more options than a single lens of greater thickness. The switching focusing speed is related to the thickness degree of the lens, and if the thickness degree is ten times lower, the switching speed of the lens is improved by about 100 times.
Furthermore, when light passes through the lens, dispersion is caused, the light passes through the conventional refractive optical element, and due to the existence of the dispersion, the sequential color distribution is sequentially from inside to outside, namely, blue, green and red.
Furthermore, when light passes through the multilayer diffraction optical element, the diffraction element in the imaging system reverses the dispersion sequence to red, green and blue.
Further, the conventional refractive optical element and the multilayer diffraction liquid crystal molecular material form dispersion complementation, and finally the dispersion is eliminated.
Further, the diffraction element is made of a special optical material having a negative abbe constant.
In a specific embodiment, for the dispersion problem caused by the light passing through the lens in the traditional scheme, the patent solves the dispersion problem by a refraction and diffraction mixed imaging optical system. The light passes through a conventional refractive optical element, and the sequential color distribution is sequentially blue, green and red from inside to outside due to the presence of chromatic dispersion, as shown in fig. 1. As light passes through the multilayer diffractive optical element, the diffractive elements within the imaging system reverse the order of dispersion, red, green, and blue, as shown in fig. 2. The diffraction element is made of a special optical material with a negative Abbe constant, and the conventional refraction optical element and the multilayer diffraction liquid crystal molecular material form dispersion complementation to finally eliminate dispersion, as shown in figure 3.
Refracting parallel light with a conventional refractive optical element, imaging the light wavelength sequence: bluish green and red (bluish green and red from left to right in the figure).
Refracting parallel light by using a multilayer diffraction optical element, and imaging light wavelength sequence: red, green and blue (red, green and blue in the figure from left to right).
After the light passes through the combined lens of the refractive optical element and the multilayer diffraction optical element (i.e. the refraction and diffraction optical system), the dispersion is eliminated.
In a specific embodiment, because the requirements of the diffraction element on materials and processes are relatively strict, the problem that the diffraction element has a plurality of microstructures and is difficult to process is solved.
Under the condition of no voltage, the liquid crystal molecules are arranged, as shown in FIG. 4, and it can be seen from the figure that the liquid crystal molecules are a polymer, and most of the liquid crystal molecules are in the shape of slender rods and have electrical anisotropy. Under the action of an external electric field, the long axes of the liquid crystal molecules rotate towards the direction parallel to the electric field lines, and the rotation degree of the liquid crystal molecules is related to the magnitude of the electric field intensity, as shown in fig. 5, so that the spatial arrangement of the liquid crystal molecules can be changed by changing the voltage, and the arrangement state of the liquid crystal molecules is shown in fig. 6, so that the propagation path of light is finally changed, and the purpose of zooming is achieved.
In order to pursue a large viewing field of the liquid crystal molecular lens, the number of layers of the lens needs to be increased; the larger the number of lens layers, the slower the switching speed. So a balance needs to be pursued between these two requirements, as shown in fig. 7
1. With respect to the use of multilayer liquid crystal molecular lenses, thinner multilayer lenses may switch faster and provide more options than a single lens of greater thickness;
2. the switching focusing speed is related to the thickness degree of the lens, and if the thickness degree is ten times lower, the switching speed of the lens is improved by about 100 times.
In one particular embodiment, as shown in FIG. 8, including a display 101, light from the display 101 is circularly polarized to the left and a portion of the light passes through a first lens 102 with a partially specular coating. The light is refracted by the first lens 102 and then passes through the quarter-wave plate 103, the quarter-wave plate 103 changes the light from left circular polarization to S-linear polarization, and then the light passes through a variable focus liquid crystal molecular lens 104. The S-polarized light is then reflected by the polarizing beam splitter 105 on the surface of the second lens 106 and returns through a variable focus liquid crystal molecular lens 104 and reaches the quarter wave plate 103 on the first lens 102, after changing the S-polarization back to left-handed, the light will be reflected by the mirror coated first lens 102, which will also cause left-handed circular light to right-handed; since the first lens 102 of the mirror coating is curved, this also causes the light rays to be curved. The first lens 102 of the mirror coating thus acts as a lens for light in one direction and a curved mirror for light in the other direction.
The light passing through the first lens 102 passes through a quarter wave plate 103, becomes linearly P-polarized and passes through a variable focus liquid crystal molecular lens 104, and the P-polarized light can then pass through a polarizing beam splitter 105 and be refracted by a second lens 106 as it is directed towards the eye, the folded path making the element more compact.
The light passing through the first lens 102 passes through a quarter wave plate 103, becomes linearly P-polarized and passes through a variable focus liquid crystal molecular lens 104, and the P-polarized light can then pass through a polarizing beam splitter 105 and be refracted by a second lens 106 as it is directed towards the eye, the folded path making the element more compact.
The arrangement of liquid crystal molecules is regularly changed by applying voltages to two ends, the applied voltages are different, the deflection angles of the liquid crystal molecules are different, the voltage directions are different, and the deflection clockwise and anticlockwise directions of the liquid crystal molecules are different. Therefore, the VR lens has higher zooming speed and wider zooming range, and the problems of heavy mass and large volume of the traditional lens are solved.
The number of the liquid crystal molecular lenses can be reasonably increased or decreased according to the thickness requirement of the lens, the optical visual angle can be reasonably controlled, and the balance between the switching speed and the visual angle is sought.
Aiming at the dispersion problem of the traditional lens, the invention provides a refraction and diffraction optical system, namely, a diffraction element is added on the basis of the traditional optical element (convex lens), and the dispersion is eliminated.
The working principle of the invention is explained below, under the condition of no voltage, the liquid crystal molecules are a polymer, and most of the liquid crystal molecules are in the shape of slender rods and have electrical anisotropy; under the action of an applied electric field, the long axes of the liquid crystal molecules rotate in a direction parallel to the electric field lines, and the rotation degree of the liquid crystal molecules is related to the intensity of the electric field. The liquid crystal molecules change the spatial arrangement of the liquid crystal molecules by changing the voltage; finally, the propagation path of the light is changed, and the purpose of zooming is achieved. The molecular lens has a large visual field, and the number of lens layers needs to be increased; the larger the number of lens layers, the slower the switching speed, the use of multilayer liquid crystal molecular lenses, the faster the switching speed of thinner multilayer lenses, and the ability to provide more options than a single lens of greater thickness. The switching focusing speed is related to the thickness degree of the lens, and if the thickness degree is ten times lower, the switching speed of the lens is improved by about 100 times. The conventional refractive optical element forms dispersion complementation with the multilayer diffraction liquid crystal molecular material, and finally eliminates dispersion.
In the description of the present invention, it is to be understood that the terms "opening," "upper," "lower," "thickness," "top," "middle," "length," "inner," "peripheral," and the like are used in an orientation or positional relationship that is merely for convenience in describing and simplifying the description, and do not indicate or imply that the referenced component or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the present invention.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing shows and describes the general principles, principal features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed.
Claims (7)
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210721406.3A CN115167058A (en) | 2022-06-17 | 2022-06-17 | Variable-focus liquid crystal molecular lens |
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| CN202210721406.3A CN115167058A (en) | 2022-06-17 | 2022-06-17 | Variable-focus liquid crystal molecular lens |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070216851A1 (en) * | 2006-03-01 | 2007-09-20 | Citizen Watch Co., Ltd. | Liquid crystal lens and imaging lens device |
| CN101256285A (en) * | 2007-12-28 | 2008-09-03 | 安徽华东光电技术研究所 | Refraction-diffraction mixed optical system as well as helmet display using the same |
| CN101672990A (en) * | 2008-09-10 | 2010-03-17 | 一品光学工业股份有限公司 | Zoom liquid crystal lens |
| CN102854670A (en) * | 2012-06-01 | 2013-01-02 | 京东方科技集团股份有限公司 | Liquid crystal display viewing angle controlling method, liquid crystal display panel and liquid crystal display |
| CN104423116A (en) * | 2013-08-21 | 2015-03-18 | 信利光电股份有限公司 | Zoom lens and camera shooting module |
| CN206074910U (en) * | 2016-09-05 | 2017-04-05 | 深圳市佳美达光电有限公司 | Big visual field low aberration folding spreads out and mixes virtual reality glasses optical system |
| CN112034658A (en) * | 2020-11-03 | 2020-12-04 | 南昌虚拟现实研究院股份有限公司 | Zoom liquid crystal lens |
-
2022
- 2022-06-17 CN CN202210721406.3A patent/CN115167058A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070216851A1 (en) * | 2006-03-01 | 2007-09-20 | Citizen Watch Co., Ltd. | Liquid crystal lens and imaging lens device |
| CN101256285A (en) * | 2007-12-28 | 2008-09-03 | 安徽华东光电技术研究所 | Refraction-diffraction mixed optical system as well as helmet display using the same |
| CN101672990A (en) * | 2008-09-10 | 2010-03-17 | 一品光学工业股份有限公司 | Zoom liquid crystal lens |
| CN102854670A (en) * | 2012-06-01 | 2013-01-02 | 京东方科技集团股份有限公司 | Liquid crystal display viewing angle controlling method, liquid crystal display panel and liquid crystal display |
| CN104423116A (en) * | 2013-08-21 | 2015-03-18 | 信利光电股份有限公司 | Zoom lens and camera shooting module |
| CN206074910U (en) * | 2016-09-05 | 2017-04-05 | 深圳市佳美达光电有限公司 | Big visual field low aberration folding spreads out and mixes virtual reality glasses optical system |
| CN112034658A (en) * | 2020-11-03 | 2020-12-04 | 南昌虚拟现实研究院股份有限公司 | Zoom liquid crystal lens |
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Application publication date: 20221011 |