Longitudinal chromatic aberration adjusting system based on geometric phase liquid crystal lensThe application relates to a Chinese patent application, the application number is 2023800181610, the application date is 2023, 12 months and 07, the application creates a division application of a longitudinal chromatic aberration adjusting system based on a geometric phase liquid crystal lens, and the mother application is an application with international application number of PCT/CN2023/136937 and enters the national stage of China.
Technical Field
The invention belongs to the field of optical display, and particularly relates to a longitudinal chromatic aberration adjusting system based on a geometric phase liquid crystal lens.
Background
When a viewer views a near object, the viewer's eye adjusts the lens so that the image of the short band of light in the visible light falls near the retina and the image of the long band of light in the visible light falls behind the retina, thereby causing the retina to move backward, i.e., causing the eyeball to develop a force that grows backwards in the longitudinal direction, which has long been the case for myopia.
Based on the above-described problems, it is required to reduce the probability of occurrence of myopia by eliminating interference factors of longitudinal chromatic aberration, while eliminating longitudinal chromatic aberration without introducing extra diopter. The solution implemented by means of the conventional refractive optical element in the prior art is too heavy to be suitable for long-term wearing by a user and has poor user experience.
Disclosure of Invention
The invention is based on the above-mentioned needs of the prior art, and the technical problem to be solved by the invention is to provide a longitudinal chromatic aberration adjusting system based on a geometric phase liquid crystal lens and glasses so as to improve wearing experience of a user.
In order to solve the above problems, the technical solution provided by the present invention includes:
The longitudinal chromatic aberration adjusting system based on the geometric phase liquid crystal lens comprises the geometric phase liquid crystal lens, a circular polarizer, a preset lens and a geometric phase liquid crystal lens, wherein the geometric phase liquid crystal lens is used for changing imaging focal lengths of different visible light wave bands incident to the geometric phase liquid crystal lens, reversing the size relation of the imaging focal lengths of different visible light wave bands, the circular polarizer is used for modulating light rays incident to the circular polarizer into circularly polarized light to eliminate stray light, the preset lens is combined with the geometric phase liquid crystal lens to reduce optical power, and after the incident light rays pass through the geometric phase liquid crystal lens, the circular polarizer and the preset lens, the different visible light wave bands are imaged on retina of a viewer to eliminate longitudinal chromatic aberration.
Through the combination of the geometric phase liquid crystal lens, the circular polaroid and the preset lens, incident light rays can have basically the same focal length on the retina of eyes of a viewer, namely interference of longitudinal errors on eye imaging is eliminated, wherein the geometric phase liquid crystal lens is combined with the lens of the viewer, different focal lengths formed by different wavelengths are eliminated, the circular polaroid ensures normal operation of the system, ghost images and stray light are avoided, and the preset lens is used for being matched with the geometric phase liquid crystal lens to form proper focal power, so that viewing experience is improved.
Preferably, the longitudinal chromatic aberration adjusting system based on the geometric phase liquid crystal lens further comprises a submodule, the submodule comprises the geometric phase liquid crystal lens, a circular polarizer and a preset lens, and a plurality of submodules are arranged in a preset mode to form the longitudinal chromatic aberration adjusting system based on the geometric phase liquid crystal lens.
The problem of perspective resolution caused by transverse chromatic aberration is avoided by arranging the submodules arranged in a preset mode, so that experience of a viewer is guaranteed.
Preferably, the diopter of the geometric phase liquid crystal lens is a first diopter smaller than zero, the diopter of the preset lens is a second diopter larger than zero, and the sum of the first diopter and the second diopter is 0.
Through the arrangement, the longitudinal chromatic aberration adjusting system maintains the characteristics of the plain glasses, is suitable for myopia prevention and control people and myopia people, and is effective in preventing and controlling myopia by eliminating the influence of longitudinal chromatic aberration on eyes and preventing the extension of eye axes. For myopia crowd, can realize correcting myopia and eliminating the effect of longitudinal chromatic aberration simultaneously through the simple cooperation of longitudinal chromatic aberration governing system and ordinary myopia correction lens to be applicable to most myopia crowd, only need overlap on the myopia glasses of daily use one have the longitudinal chromatic aberration governing system of plano-optic mirror characteristic can, the flexibility of adaptation is high.
Preferably, the absolute value of the first diopter is greater than the absolute value of the second diopter.
Through the arrangement, the longitudinal chromatic aberration adjusting system has a certain diopter, the effects of correcting myopia and eliminating longitudinal chromatic aberration can be directly achieved through the system, the diopter of the longitudinal chromatic aberration adjusting system is adjusted in a personalized mode according to the actual eye condition of a viewer so as to avoid combining with a myopia correcting lens, and the longitudinal chromatic aberration adjusting system is light in overall structure and high in pertinence.
Preferably, the range of the first diopter is-10D to-1D, and the range of the second diopter is 1D to 10D.
With the above arrangement, the diopter of the system can be adjusted in a large range to fit most people.
Preferably, the geometric phase liquid crystal lens comprises a photo-alignment layer and a plurality of layers of liquid crystal layers arranged on the photo-alignment layer, wherein the lowermost molecules in the liquid crystal layers connected with the photo-alignment layer are arranged according to the arrangement mode of the molecules in the photo-alignment layer.
The light efficiency is improved by the arrangement.
Preferably, molecules connected between adjacent liquid crystal layers are arranged in the same direction.
The light efficiency is improved by the arrangement.
Preferably, the liquid crystal molecules in the liquid crystal layer form a helical structure along the first direction.
The light efficiency is improved by the arrangement.
Preferably, the angle of the molecules in the photo-alignment layer in the plane satisfies the conditionWhere f is the focal length of the geometric phase liquid crystal lens, λ is the wavelength, β (x, y) is the higher order phase term, x is the abscissa of the plane in which the liquid crystal lens is located, and y is the ordinate of the plane in which the liquid crystal lens is located.
Preferably, the area of the plane in which the sub-modules lie is from 0.25 square mm to 25 square mm.
There is also provided an ophthalmic lens comprising any one of the above-mentioned longitudinal chromatic aberration adjustment systems based on a geometrical phase liquid crystal lens.
By the arrangement, a portable glasses structure is formed according to the actual situation of the viewer, so that the influence of longitudinal chromatic aberration on the viewing experience of the viewer is effectively eliminated.
Compared with the prior art, the optical lens has the advantages that the geometric phase liquid crystal lens is arranged to be matched with the lens of an eye to eliminate longitudinal chromatic aberration, the circular polaroid is arranged to eliminate ghost images and stray light, the preset lens is arranged to be matched with the geometric phase liquid crystal lens to form proper optical power, the optical lens has good viewing experience while eliminating the longitudinal chromatic aberration, the plurality of sub-modules are arranged at the same time and are arranged in a preset mode to avoid perspective resolution caused by generated transverse chromatic aberration, in addition, the diopter of the geometric phase liquid crystal lens is arranged to be flexibly applied in different scenes, and the optical efficiency of the liquid crystal lens in a visible light wave band is improved through the level adjustment of the geometric phase liquid crystal lens.
Drawings
In order to more clearly illustrate the embodiments of the present description or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the embodiments of the present description, and other drawings may be obtained according to these drawings for a person having ordinary skill in the art.
FIG. 1 is a schematic view of longitudinal chromatic aberration formed by different wavebands of light rays at the retinal disparity when an eye is looking at a distance;
FIG. 2 is a schematic view of the eye looking near and not focused with different bands of light imaged near the retina;
FIG. 3 is a schematic view of the eye looking near and focusing different bands of light being imaged near the retina;
FIG. 4 is a schematic plan view of a longitudinal chromatic aberration adjustment system formed by an arrangement of sub-modules;
FIG. 5 is a schematic diagram of the imaging of different band light rays through a geometric phase liquid crystal lens;
FIG. 6 is a side cross-sectional block diagram of a sub-module of the longitudinal color difference adjustment system;
FIG. 7 is a configuration diagram of a geometric phase liquid crystal lens;
FIG. 8 is a schematic diagram of a spiral structure in a geometric phase liquid crystal lens;
FIG. 9 is a schematic plan view of a photoalignment layer in a geometric phase liquid crystal lens;
FIG. 10 is a schematic structural diagram of a photo-alignment layer molecule;
FIG. 11 is a schematic diagram of experimental data;
Fig. 12 is a schematic view of the imaging of light rays on the retina after passing through the longitudinal chromatic aberration adjustment system.
Reference numerals:
1. Short-band imaging, 2, medium-band imaging, 3, long-band imaging, 4, retina, 5, crystalline lens, 6, submodule, 601, geometric phase liquid crystal lens, 601A, photo-alignment layer, 601B, liquid crystal layer, 602, circular polaroid, 603, preset lens, 7, longitudinal chromatic aberration regulating system, 8, spiral structure, 9, photo-alignment layer molecule.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
In describing embodiments of the present invention, it should be noted that, unless explicitly stated and limited otherwise, the term "coupled" should be interpreted broadly, for example, as being fixedly coupled, as being detachably coupled, as being integrally coupled, as being mechanically coupled, as being electrically coupled, as being directly coupled, as being indirectly coupled via an intermediate medium. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
The terms "top," "bottom," "above," "below," and "above" are used throughout the description to refer to relative positions of components of the device, such as the relative positions of the top and bottom substrates inside the device. It will be appreciated that the devices are versatile, irrespective of their orientation in space.
For the purpose of facilitating an understanding of the embodiments of the present application, reference will now be made to the following description of specific embodiments, taken in conjunction with the accompanying drawings, which are not intended to limit the embodiments of the application.
Example 1
When a viewer is looking at a distant object, light entering the eye is focused through accommodation of the lens 5, but since the lens 5 has different refractive indices for light having wavelengths in different bands, the different bands of light have different imaging positions in the eye. When the viewer looks away, the lens 5 is in a relaxed state, and the focal length of short-band (blue) imaging is smaller than that of intermediate-band (green) imaging, and the focal length of intermediate-band imaging 2 is smaller than that of long-band (red) imaging. If the mid-band imaging 2 is on the retina 4, the short-band imaging 1 will fall in front of the retina 4 and the long-band imaging 3 will fall behind the retina 4, if the short-band imaging 1 is on the retina 4, both the mid-band imaging 2 and the long-band imaging 3 will be behind the retina 4, and if the long-band imaging 3 is on the retina 4, both the short-band imaging 1 and the mid-band imaging 2 will fall in front of the retina 4. As shown in fig. 1, the middle band imaging 2 can concentrate the imaging of distant objects on the retina 4 near the retina 4, at this time, the retina 4 is imaged in front and back, balanced, the retina 4 will not move forward or backward, and the middle band imaging 2 can maximize the sharpness of the overall image on the retina 4 compared to the short band imaging 1 on the retina 4 or the long band imaging 3 on the retina 4.
When the viewer is looking at near objects, as shown in fig. 2, after the light rays entering the eye are focused by accommodation of the lens 5, the short-band imaging 1, the mid-band imaging 2 and the long-band imaging 3 will all be behind the retina 4, when the overall image is blurred, if the lens 5 is still in a relaxed state.
When the viewer is looking at near objects and the lens 5 is thickened, as shown in fig. 3, the light entering the eye is often adjusted through the focal adjustment of the lens 5 so that the overall image seen is relatively clear when the short-range imaging 1 is located on the retina 4, in which case the lens 5 will not be adjusted again so that the mid-range imaging 2 is on the retina 4, and both the mid-range imaging 2 and the long-range imaging 3 are located behind the retina 4, such a signal will stimulate growth at the positions of the mid-range imaging 2 and the long-range imaging 3 behind the eyeball image, thereby causing the eye axis to elongate, forming myopia or further deepening the extent of myopia.
Based on the above principle, the present embodiment provides a longitudinal chromatic aberration adjusting system 7 based on a geometric phase liquid crystal lens, as shown in fig. 4 to 10.
The longitudinal chromatic aberration adjusting system 7 based on a geometric phase liquid crystal lens will be hereinafter referred to simply as a "longitudinal chromatic aberration adjusting system", the longitudinal chromatic aberration adjusting system 7 includes a plurality of sub-modules 6, the area of the sub-modules 6 in a plane is 0.25 square millimeters to 25 square millimeters, and the plurality of sub-modules 6 are arranged in an array form so as to avoid the problem of low perspective resolution caused by lateral chromatic aberration. Illustratively, as shown in fig. 4, the sub-modules 6 are rectangular and arranged in three rows and four columns, and the shape and arrangement of the plurality of sub-modules 6 are not limited. The occupied area of the sub-module in the plane is 0.25 square millimeters to 25 square millimeters
As shown in fig. 6, the sub-module 6 comprises a geometrical phase liquid crystal lens 601.
The geometric phase liquid crystal lens 601, as shown in fig. 5, is a planar diffraction optical element, and when parallel light in the visible light band is incident on the geometric phase liquid crystal lens 601, the focal length of the short-band imaging 1 passing through the geometric phase liquid crystal lens 601 is larger than the focal length of the middle-band imaging 2, and the focal length of the middle-band imaging 2 is larger than the focal length of the long-band imaging 3. That is, the longitudinal chromatic aberration after passing through the geometric phase liquid crystal lens 601 is opposite to that through the lens 5 or the conventional refractive optical element. And setting the diopter of the geometric phase liquid level lens to be between-10D and-1D.
The geometric phase liquid crystal lens 601 has a configuration as shown in fig. 7 to 10, and includes a photo-alignment layer 601A and a liquid crystal 601B. The bottom layer is a photo-alignment layer 601A, and the photo-alignment layer molecules 9 are arranged as shown in fig. 9 and 10, specifically, the angles of the photo-alignment layer molecules 9 in the planeThe distribution satisfies the conditionWherein f is the focal length of the geometric phase liquid crystal lens, lambda is the wavelength, beta (x, y) is the higher-order phase term, and x, y are the coordinates of the plane in which the liquid crystal lens is located, respectively. Above the photo-alignment layer 601A, N layers of liquid crystals 601B are arranged, the lowermost molecules of the liquid crystals 601B adjacent to the photo-alignment layer 601A are identical to the arrangement of the molecules 9 of the photo-alignment layer, the molecules contacted between the adjacent liquid crystals 601B in the N layers of liquid crystals 601B are arranged in the same direction, and each layer of liquid crystals 601B has a helical structure 8 in the first direction, and the helical structure 8 spontaneously forms. The spontaneous helical structure 8 is specifically shown as follows, the thickness of the liquid crystal molecules in the ith layer of liquid crystal 601B is di, the rotation angle of the liquid crystal molecules in the first direction is αi, i=1 to n, and the geometric phase liquid crystal lens 601 has an efficiency of more than 90% in the visible light band.
The geometric phase liquid crystal lens 601 can achieve a larger reverse longitudinal chromatic aberration with a smaller optical power than conventional lenses. The experimental data represented in FIG. 11 is illustrated by the Abbe number of approximately 64, the optical power of a 50cm focal length (2.0D) lens made using NBK7, a blue (488 nm) optical power of 2.01D, a green (532 nm) optical power of 2.0D, a red (633 nm) optical power of 1.98D, and a blue and red optical power difference of 0.03D. The optical power measurements at blue (488 nm), green (532 nm), red (633 nm) were 1.85d,1.99d,2.36d using a geometric phase liquid crystal lens 601. The difference in optical power between blue and red light was-0.51D. Based on the above test data, it was found that the optical power-wavelength dispersion relationship was opposite between the geometric phase liquid crystal lens 601 and the conventional glass lens, and that the Abbe number of the geometric phase liquid crystal lens 601 was approximately 17 times that of the conventional glass material NBK 7. Thus, the geometric phase liquid crystal lens 601 can achieve a larger reverse longitudinal chromatic aberration by a smaller optical power.
The longitudinal chromatic aberration adjusting system 7 further comprises a circular polarizer 602 and a preset lens 603, and the relative arrangement sequence among the geometric phase liquid crystal lens 601, the circular polarizer 602 and the preset lens 603 can be changed arbitrarily. The circular polarizer 602 is arranged to ensure the normal operation of the geometric phase liquid crystal lens 601 and avoid ghost images and stray light, the diopter of the preset lens 603 is 1D-10D, the preset lens 603 can be matched with the geometric phase liquid crystal lens 601 to form proper focal power, and if the preset lens 603 is not arranged, larger focal power is finally formed to seriously influence the watching experience.
As shown in fig. 12, after the light rays emitted from the near object or the far object pass through the longitudinal chromatic aberration adjusting system 7 and the lens 5 of the viewer, the full band of visible light is focused on the retina 4 of the viewer, and there is no spatial separation, that is, no longitudinal chromatic aberration, so that the elongation of the eyeball caused by the longitudinal chromatic aberration can be prevented to a limited extent.
Further, after the light is modulated by the longitudinal chromatic aberration adjusting system 7, the focal length of the long-wave band imaging 3 is smaller than that of the short-wave band imaging 1, so that the longitudinal chromatic aberration is reversed, and the effect of reversely stimulating the eyeball longitudinal elongation signal is generated.
In some application scenarios, the longitudinal chromatic adjustment system 7 maintains the characteristics of a flat mirror, i.e., the system diopter is 0, the diopter of the geometric phase liquid crystal lens 601 is opposite to the diopter of the preset lens 603, and the diopter of the geometric phase liquid crystal lens 601 is-5D, and the diopter of the preset lens 603 is 5D. The longitudinal chromatic aberration adjusting system 7 with the characteristics of the plano-optic is suitable for preventing and controlling myopia of people with normal eyes. In addition, the effect of correcting myopia and eliminating longitudinal chromatic aberration can be simultaneously realized through the simple cooperation of the longitudinal chromatic aberration adjusting system 7 and the common myopia correcting lens, so that the device is suitable for most myopia people, only the longitudinal chromatic aberration adjusting system 7 with the characteristics of a smooth lens is required to be overlapped on the myopia glasses used daily, and the adaptation flexibility is high.
In some application scenarios, the longitudinal chromatic aberration adjusting system 7 may be set to have a certain diopter, and the absolute value of the diopter of the geometric phase liquid crystal lens 601 is specifically set to be larger than that of the preset lens 603, so that the effects of correcting myopia and eliminating longitudinal chromatic aberration can be simultaneously achieved, the diopter of the longitudinal chromatic aberration adjusting system 7 is individually adjusted according to the actual eye situation of the viewer, so that the combination of a myopia correcting lens is not needed, and the overall structure of the longitudinal chromatic aberration adjusting system 7 is light and has high pertinence.
By the arrangement, the longitudinal chromatic aberration entering eyes of a viewer is eliminated, so that the adverse effect of an extended eye axis caused by the longitudinal chromatic aberration is avoided, and meanwhile, the longitudinal chromatic aberration adjusting system 7 is matched with a proper lens, so that myopia correction and longitudinal chromatic aberration elimination are realized according to the actual eye use condition of the viewer.
Example 2
The present embodiment provides an eyeglass comprising a lens comprising the longitudinal chromatic aberration adjustment system 7 of embodiment 1 based on the geometric phase liquid crystal lens 601.
By the arrangement, the proper longitudinal chromatic aberration adjusting system 7 based on the geometric phase liquid crystal lens 601 is matched according to different eye conditions of a wearer, so that the longitudinal chromatic aberration is effectively eliminated, the eye axis elongation caused by the longitudinal chromatic aberration is avoided, and myopia prevention, control and relief are facilitated.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the application, and is not meant to limit the scope of the application, but to limit the application to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the application are intended to be included within the scope of the application.