阅读说明：本技术 一种液晶透镜像差优化方法及应用 (Liquid crystal lens aberration optimization method and application ) 是由 姜海明 苏树钊 谢康 于 2021-08-16 设计创作，主要内容包括：本发明提供了一种液晶透镜像差优化方法,包括S1通过获取液晶透镜任一直径方向上位置相关的理想折射率分布曲线；S2建立液晶透镜电场强度与有效折射率的关系；S3利用步骤2和步骤1,得到位置相关的理想电场强度Z方向分量的分布；S4根据电势和电场强度与高阻层高度的关系,以理想的电场强度Z方向分量为目标,得到位置相关的高阻层高度分布。本发明还提供了一种利用液晶透镜像差优化方法的应用。本发明解决了高阻层型液晶透镜在实际使用中,实际的有效折射率与理折射率存在偏差,导致成像的像差大的问题。本发明能够使得高阻层型液晶透镜的实际折射率分布更接近理想的二次抛物型分布曲线,可大大减小液晶透镜成像时的像差。(The invention provides a method for optimizing aberration of a liquid crystal lens, which comprises the steps of S1 obtaining an ideal refractive index distribution curve related to the position of the liquid crystal lens in any diameter direction; s2, establishing the relation between the electric field intensity and the effective refractive index of the liquid crystal lens; s3, obtaining the distribution of ideal electric field intensity Z direction components related to the position by utilizing the step 2 and the step 1; s4 according to the relationship between the potential and the electric field intensity and the height of the high resistance layer, the ideal electric field intensity Z direction component is taken as the target to obtain the height distribution of the high resistance layer related to the position. The invention also provides an application of the liquid crystal lens aberration optimization method. The invention solves the problem that the imaging aberration is large because the actual effective refractive index and the physical refractive index of the high-resistance layer type liquid crystal lens have deviation in actual use. The invention can make the actual refractive index distribution of the high-resistance layer type liquid crystal lens closer to an ideal secondary parabolic distribution curve, and can greatly reduce the aberration of the liquid crystal lens during imaging.)

1. The method for optimizing the aberration of the liquid crystal lens is characterized by comprising the following specific steps of:

step 1: obtaining distribution curves of ideal refractive indexes of the reference liquid crystal lens at different positions away from the center of the liquid crystal lens, and recording the distribution curves as ideal curves;

step 2: creating a simulation model of the reference liquid crystal lens under the electric field, simulating refractive index data of the reference liquid crystal lens under different electric potentials, and fitting a relational expression of a component of the electric field intensity in the z direction and the effective refractive index of liquid crystal molecules under a given model by utilizing the refractive index data;

and step 3: obtaining ideal electric field intensity z-direction components at different positions away from the center of the liquid crystal lens by using the relational expression of the electric field intensity z-direction component and the effective refractive index in the step 2 and the ideal refractive index of the ideal curve in the step 1;

and 4, step 4: and obtaining ideal height data of the high-resistance layer at different positions from the center of the liquid crystal lens by taking the component in the z direction of the ideal electric field intensity as a target according to the corresponding relation between the height data of the high-resistance layer of the reference liquid crystal lens and the ratio of the applied electric potential to the electric field intensity.

2. The method for optimizing aberration of a liquid crystal lens according to claim 1, wherein the step 2 comprises the following steps:

step 201: creating a simulation model of the reference liquid crystal lens under an electric field, applying a potential to an upper electrode layer of the reference liquid crystal lens, grounding a lower electrode layer, obtaining liquid crystal molecule inclination angle data under different potentials through the simulation model, and converting the inclination angle data into the effective refractive index of liquid crystal molecules;

step 202: and fitting a relational expression between the z-direction component of the electric field strength under a given model and the effective refractive index of the liquid crystal molecules by using the effective refractive index data of the liquid crystal molecules of the reference liquid crystal lens under different electric potentials.

3. The application of the liquid crystal lens aberration optimization method is characterized in that the high-resistance layer height distribution of a target liquid crystal lens is improved by using high-resistance layer height data.

4. The liquid crystal lens designed by the liquid crystal lens aberration optimization method comprises a first substrate (1) and a second substrate (2) which are oppositely arranged, and a liquid crystal layer (3) positioned between the first substrate (1) and the second substrate (2); the liquid crystal display panel comprises a first alignment layer (4) and a second alignment layer (5) which are respectively positioned at two sides of the liquid crystal layer (3) and face the first substrate (1) and the second substrate (2), a first electrode layer (6) positioned between the second alignment layer (5) and the second substrate (2), a high-resistance layer (7) positioned between the first alignment layer (4) and the first substrate (1), and a second electrode layer (8) which is connected with the outer edge of the high-resistance layer (7) and positioned between the first alignment layer (4) and the first substrate (1);

characterized in that the height of the lower bottom surface of the high resistance layer (7) from the first electrode layer (6) is determined by the optimization method according to any of claims 1-2, and the gap between the high resistance layer (7) and the first alignment layer (4) is further provided with a spacer layer (9).

5. Liquid crystal lens according to claim 4, characterized in that the first (1) and second (2) substrates are made of glass, the glass having a light transmission of at least 90%.

6. Liquid crystal lens according to claim 4, characterized in that the liquid crystal layer (3) is a nematic liquid crystal.

7. Liquid crystal lens according to claim 4, characterized in that the spacer layer (9) is a polymer layer having a light transmission of at least 90%.

8. Liquid crystal lens according to claim 4, characterized in that the rubbing directions of the opposite sides of the first (4) and second (5) alignment layers are opposite.

9. Liquid crystal lens according to claim 4, characterised in that the high resistance layer (7) is corrugated from centre to edge.

10. A liquid crystal lens according to claim 9, characterized in that the side of the first substrate (1) in contact with the high resistance layer (7) matches the water wave shaped surface of the high resistance layer (7).

11. A liquid crystal lens according to claim 4, characterized in that the high-resistance layer (7) is made of a material comprising any one of TiOx, ZnO, ZnS, SnO, Sb-Sn-O, ZrO and VO.

Technical Field

The invention relates to the technical field of liquid crystal lenses, in particular to an aberration optimization method and application of a liquid crystal lens.

Background

With the development of the image field, lenses play more and more important roles therein, such as the medical field, the laser field, the video field, and the like. The main working principle of the liquid crystal lens is that the incident plane wave experiences a lens-like phase difference in the process of propagating in the liquid crystal lens by utilizing the birefringence characteristics of liquid crystal and the distribution of liquid crystal molecular director orientation, so that the convergence or divergence of light is formed. NaumovAF et al, 1998, proposed a mode liquid crystal lens having a structure similar to that of a round hole type liquid crystal lens, except that by plating a high-resistance film on the round hole of the liquid crystal lens, the defects of the round hole type liquid crystal lens in the case of a large aperture are effectively overcome, and the focus of the lens can be adjusted by adjusting the amplitude and frequency of the voltage applied to the liquid crystal lens. Li Dongping et al, in the journal of optoelectronics technology, volume 34, No. 4, disclose "research on the preparation and optical imaging characteristics of mode liquid crystal lens", and propose three important parameters determining the distribution of the surface potential of the small hole of the liquid crystal lens, which are the square resistance of the thin film of the high resistance layer, the liquid crystal capacitance, and the frequency of the voltage applied to the lens, based on the theory of the original circular hole type liquid crystal lens and the Mode Liquid Crystal Lens (MLCL).

Based on the prior art as a theoretical basis, it can be known that, because liquid crystals have birefringence characteristics, refractive indexes at different positions of the lens are different, and for the lens with a given aperture size and a high-resistance layer thin film sheet resistance, a voltage with an optimal frequency can be found to enable the lens to form an ideal refractive index distribution similar to a parabola, so that the lens has a good imaging effect. However, the deviation of the actual effective refractive index distribution from the ideal refractive index distribution causes aberration of the liquid crystal lens, which seriously affects the imaging quality of the liquid crystal lens. In some scenarios where a fixed focal length lens is used and the focal plane needs to be changed, a mechanical drive is often required to achieve this goal, which undoubtedly increases the complexity of the system.

Disclosure of Invention

The invention aims to solve the problem that the aberration of imaging is large due to the fact that the actual effective refractive index and the physical refractive index of a high-resistance layer type liquid crystal lens in the prior art are deviated in practical use, and provides an aberration optimization method and application of the liquid crystal lens. The invention can make the actual refractive index distribution of the high-resistance layer type liquid crystal lens closer to an ideal secondary parabolic distribution curve, greatly reduce the aberration of the liquid crystal lens during imaging and obviously improve the imaging quality.

In order to solve the technical problems, the invention adopts the technical scheme that:

a method for optimizing aberration of a liquid crystal lens comprises the following specific steps:

step 1: the method comprises the steps of obtaining distribution curves of ideal refractive indexes of a reference liquid crystal lens at different positions away from the center of the liquid crystal lens, and obtaining the distribution curve of the ideal refractive index of the reference liquid crystal lens at each equal division point position on one diameter of the reference liquid crystal lens by dividing the diameter of the reference liquid crystal lens into N equal divisions from the circle center to the two ends of the reference liquid crystal lens and marking the distribution curve as an ideal curve;

the formula:

wherein n is_cIs the refractive index of the center of the lens; r is the position of the lens from the center of the circle in the radial direction, d_lcIs the thickness of the liquid crystal layer, f is the corresponding focal length, n_ideal(r) is the ideal refractive index corresponding to each bisector position;

step 2: creating a simulation model of the reference liquid crystal lens under the electric field, simulating refractive index data of the reference liquid crystal lens under different electric potentials, and fitting a relational expression of a component of the electric field intensity in the z direction and the effective refractive index of liquid crystal molecules under a given model by utilizing the refractive index data;

the formula:

E_z＝f(n_eff)

wherein E is_zIs a z-direction component of the electric field intensity, n_effIs the effective refractive index of the liquid crystal molecules;

and step 3: substituting the ideal refractive index of the ideal curve in the step 1 into the relation between the z-direction component of the electric field intensity and the effective refractive index in the step 2 to obtain the z-direction component of the ideal electric field intensity corresponding to each bisector, namely E_ideal(r)；

And 4, step 4: according to the height data of the high-resistance layer of the reference liquid crystal lens and the applied potential and electric field intensityThe corresponding relation of the ratio of degrees, i.e. d ═ U/E, with E_ideal(r) as a target, and obtaining the height d (r) data of each equant point position and the corresponding high-resistance layer through liquid crystal lens multi-physical field simulation;

wherein d is the height of the high-resistance layer, U is the potential applied on the liquid crystal lens, and E is the electric field intensity of the liquid crystal lens;

further, the step 2 comprises the following steps:

step 201: creating a simulation model of the reference liquid crystal lens under an electric field by using simulation software, applying a potential to an upper electrode layer of the reference liquid crystal lens, grounding a lower electrode layer, obtaining tilt angle data of liquid crystal molecules under different potentials through the simulation model, and converting the tilt angle data into the effective refractive index of the liquid crystal molecules;

the formula:

wherein n is_effIs the effective refractive index of the liquid crystal molecules, theta is the tilt angle of the liquid crystal molecules, n_oIs the ordinary refractive index, n, of the liquid crystal material_eIs the refractive index of extraordinary rays;

step 202: and fitting a relational expression between the z-direction component of the electric field strength under a given model and the effective refractive index of the liquid crystal molecules by using the effective refractive index data of the liquid crystal molecules of the reference liquid crystal lens under different electric potentials.

The formula:

E_z＝f(n_eff)

it should be noted that, the reference liquid crystal lens is a conventional high-resistance layer type liquid crystal lens, as shown in fig. 1, the structures from top to bottom are respectively: a Glass carrier (Glass), a Ring electrode (Ring electrode), a High resistance layer (High resistance layer), a polyimide film (PI), a liquid crystal layer, a PI, a Circular electrode (Circular electrode), and a Glass carrier (Glass);

as shown in fig. 2, the operating state of the liquid crystal lens can be represented by an equivalent circuit, the liquid crystal layer can be replaced by a capacitance layer, the high resistance layer can be represented by discrete resistors, the lens aperture can be divided into N equal parts along the diameter direction from the center to the edge, and the circuit knowledge shows that the larger the resistance of the element is, the larger the divided voltage is in the series circuit. According to the principle, the resistance value of the capacitor at the edge of the lens and the resistor connected with the capacitor is very small, so that the voltage divided by the capacitor is very large; the closer the capacitive area is to the center of the lens, the greater the resistance connected thereto, and the smaller the voltage divided by the capacitance. Thus, the distribution that the voltage is gradually reduced from the edge of the lens to the center is formed at the high-resistance layer, and the Ez distribution in the space of the liquid crystal lens is consistent with the potential distribution trend because the thickness of the liquid crystal lens is constant; the electric potential of the region near the center is low, the electric potential of the region near the edge of the circle is high, and the spatial distribution of the z-direction component (Ez) of the electric field intensity in the diameter direction of the liquid crystal lens is as shown in fig. 3;

the relationship curve of Ez and the tilt angle of the liquid crystal molecules is a curve which monotonically increases (Ez is an abscissa and the tilt angle of the liquid crystal molecules is an ordinate), and the relationship curve of the tilt angle of the liquid crystal molecules and the effective refractive index is a curve which monotonically decreases. Therefore, the distribution of the effective refractive index in the liquid crystal lens along the diameter direction is the distribution in which the lens center gradually decreases to the edges of the two lenses, as shown in fig. 4;

the effective refractive index distribution of the liquid crystal lens can be adjusted by changing the amplitude and frequency of the driving voltage, so that the aim of zooming is fulfilled. Therefore, the spatial electric field intensity distribution of the lens is adjusted by optimizing the height of the high-resistance layer, so that the ideal refractive index distribution of the liquid crystal lens is further realized, and the imaging quality of the liquid crystal lens is finally improved.

The application of the liquid crystal lens aberration optimization method is to improve the height distribution of a high-resistance layer of a target liquid crystal lens by using the height data of the high-resistance layer, and to manufacture the liquid crystal lens by using the height data of the high-resistance layer at each equal dividing point position calculated in the step 4.

The liquid crystal lens designed by the liquid crystal lens aberration optimization method comprises a first substrate, a second substrate and a liquid crystal layer, wherein the first substrate and the second substrate are oppositely arranged, and the liquid crystal layer is positioned between the first substrate and the second substrate; the liquid crystal display device comprises a first alignment layer, a second alignment layer, a first electrode layer, a high-resistance layer and a second electrode layer, wherein the first alignment layer and the second alignment layer are respectively positioned on one side of a liquid crystal layer facing a first substrate and one side of a second substrate; the height from the lower bottom surface of the high-resistance layer to the first electrode layer is determined by a liquid crystal lens aberration optimization method, and a liner layer 9 is further arranged in a gap between the high-resistance layer and the first alignment layer.

Further, the cushion layer is a polymer layer having a light transmittance of at least 90%.

It should be noted that the reason why the gap between the high-resistance layer and the first alignment layer is filled with the polymer and the glass material is not selected is that the polymer can be easily processed into any curved surface, and the polymer is selected from a substance with higher light transmittance, so that the polymer can better adapt to the refraction requirement and is easier to process; the height of the high-resistance layer from the first electrode layer is determined according to a liquid crystal lens aberration optimization method, but the thickness of the high-resistance layer is kept consistent from the center position to the edge position of the liquid crystal lens; the high-resistance layer is electrically connected with the second electrode layer, so that the high-resistance layer forms an equivalent circuit in a working state through the electrical connection of the second electrode layer, and the potential between the high-resistance layer and the electrode layer corresponds to the distance between the high-resistance layer and the electrode layer.

It should be noted that, if it is difficult to achieve a high-resistance layer with inconsistent height, the high-resistance layer is covered on the glass surface by magnetron sputtering and the height of the high-resistance layer is controlled accurately, the height distribution of the high-resistance layer in different areas can be calculated, and then the liner layer or the first substrate is manufactured to have a corresponding radian height matched with the radian height of the liner layer or the first substrate, and finally the high-resistance layer is subjected to magnetron sputtering, so that the height distribution of the high-resistance layer is controlled accurately.

Like this, adjust the high refracting index distribution that realizes the liquid crystal lens ideal to the height of the high resistant layer of high resistant layer type liquid crystal lens to improve the imaging quality of lens, in some use fixed focus's lens and need change focal plane's scene, do not need mechanical structure's drive to reach the purpose, the effective refracting index that liquid crystal lens itself can reach is close ideal refracting index, and imaging effect is good, facilitates the use.

Further, the first substrate and the second substrate are made of glass, and the light transmittance of the glass is at least 90%.

Further, the liquid crystal layer is nematic liquid crystal. Thus, the short-range interaction between molecules of nematic liquid crystal is weak, and the spontaneous alignment process in which the long axes of the molecules are parallel to each other can cause the liquid crystal to have high birefringence.

Further, the rubbing direction of the opposite side of the first alignment layer and the second alignment layer is opposite.

Furthermore, the high-resistance layer is in a water wave shape from the center position to the edge of the liquid crystal lens.

Furthermore, one side of the first substrate, which is in contact with the high-resistance layer, is matched with the water wave-shaped surface of the high-resistance layer.

The thickness of the second substrate is 0.2mm to 0.4 mm. Therefore, the thickness of the substrate is controlled within a certain range, the light transmission loss can be reduced, and the refraction effect is ensured.

Further, the material of the high-resistance layer includes, but is not limited to, any one of TiOx, ZnO, ZnS, SnO, Sb-Sn-O, ZrO, and VO. Thus, the high-resistance layer is generally made of transparent material with high resistance value by combining the conductivity and relative dielectric constant of the material, so that the high-resistance layer achieves better effect.

Compared with the prior art, the invention has the beneficial effects that:

(1) the invention further realizes the ideal refractive index distribution of the liquid crystal lens by establishing the relation between the height of the high-resistance layer and the ideal curve and adjusting the spatial electric field intensity distribution of the lens.

(2) The height data between the high-resistance layer distance electrode layers is determined by using a liquid crystal lens aberration optimization method, the liquid crystal lens is manufactured according to the height data, the effective refractive index of the liquid crystal lens is close to the ideal refractive index, and in some scenes that a lens with a fixed focal length is used and a focal plane needs to be changed, the liquid crystal lens can achieve a good imaging effect without being driven by a mechanical structure.

Drawings

FIG. 1 is a schematic diagram of a reference liquid crystal lens according to the present invention;

FIG. 2 is an equivalent circuit diagram of a reference liquid crystal lens according to the present invention;

FIG. 3 is a spatial distribution diagram of a z-direction component (Ez) of an electric field intensity in a diameter direction of a liquid crystal lens in the present invention;

FIG. 4 is a spatial distribution diagram of the effective refractive index in the diameter direction of the liquid crystal lens according to the present invention;

FIG. 5 is a flow chart of the steps of the present invention;

fig. 6 is a schematic structural diagram of a liquid crystal lens in the present invention.

The graphic symbols are illustrated as follows:

1-a first substrate, 2-a second substrate, 3-a liquid crystal layer, 4-a first alignment layer, 5-a second alignment layer, 6-a first electrode layer, 7-a high resistance layer, 8-a second electrode layer, 9-a gasket layer.

Detailed Description

The present invention will be further described with reference to the following embodiments. Wherein the showings are for the purpose of illustration only and are shown by way of illustration only and not in actual form, and are not to be construed as limiting the present patent; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

Example 1

As shown in fig. 1 to 4, a method for optimizing aberration of a liquid crystal lens includes the following steps:

step 1: the method comprises the steps of obtaining distribution curves of ideal refractive indexes of a reference liquid crystal lens at different positions away from the center of the liquid crystal lens, and obtaining the distribution curve of the ideal refractive index of the reference liquid crystal lens at each equal division point position on one diameter of the reference liquid crystal lens by dividing the diameter of the reference liquid crystal lens into N equal divisions from the circle center to the two ends of the reference liquid crystal lens and marking the distribution curve as an ideal curve;

the formula:

wherein n is_cIs the refractive index of the center of the lens; r is the position of the lens from the center of the circle in the radial direction, d_lcIs the thickness of the liquid crystal layer, f is the corresponding focal length, n_ideal(r) is the ideal refractive index corresponding to each bisector position;

step 2: establishing a simulation model of the reference liquid crystal lens under the electric field by using simulation software, simulating refractive index data of the reference liquid crystal lens under different electric potentials, and fitting a relational expression of a component of the electric field intensity in the z direction and the effective refractive index of liquid crystal molecules under a given model by using the refractive index data;

the formula:

E_z＝f(n_eff)

wherein E is_zIs a z-direction component of the electric field intensity, n_effIs the effective refractive index of the liquid crystal molecules;

and step 3: substituting the ideal refractive index of the ideal curve in the step 1 into the relation between the z-direction component of the electric field intensity and the effective refractive index in the step 2 to obtain the z-direction component of the ideal electric field intensity corresponding to each bisector, namely E_ideal(r)；

And 4, step 4: according to the corresponding relation of height data of a high-resistance layer of a reference liquid crystal lens and the ratio of the applied potential to the electric field intensity, namely d ═ U/E, and E_ideal(r) as a target, and obtaining the height d (r) data of each equant point position and the corresponding high-resistance layer through liquid crystal lens multi-physical field simulation;

wherein d is the height of the high-resistance layer, U is the potential applied on the liquid crystal lens, and E is the electric field intensity of the liquid crystal lens;

in this embodiment, the step 2 specifically includes the following steps:

step 201: creating a simulation model of the reference liquid crystal lens under an electric field by using simulation software, applying a potential to an upper electrode layer of the reference liquid crystal lens, grounding a lower electrode layer, obtaining tilt angle data of liquid crystal molecules under different potentials through the simulation model, and converting the tilt angle data into the effective refractive index of the liquid crystal molecules;

the formula:

wherein n is_effIs the effective refractive index of the liquid crystal molecules, theta is the tilt angle of the liquid crystal molecules, n_oIs the ordinary refractive index, n, of the liquid crystal material_eIs the refractive index of extraordinary rays;

step 202: and fitting a relational expression between the z-direction component of the electric field strength under a given model and the effective refractive index of the liquid crystal molecules by using the effective refractive index data of the liquid crystal molecules of the reference liquid crystal lens under different electric potentials.

The formula:

E_z＝f(n_eff)

the principle of the method is as follows: as shown in fig. 1, the reference lc lens is a conventional high-resistance layer type lc lens, and its structures from top to bottom are: a Glass carrier (Glass), a Ring electrode (Ring electrode), a High resistance layer (High resistance layer), a polyimide film (PI), a liquid crystal layer, a PI, a Circular electrode (Circular electrode), and a Glass carrier (Glass);

as shown in fig. 2, the operating state of the liquid crystal lens can be represented by an equivalent circuit, the liquid crystal layer can be replaced by a capacitance layer, the high resistance layer can be represented by discrete resistors, the lens aperture can be divided into N equal parts along the diameter direction from the center to the edge, and the circuit knowledge shows that the larger the resistance of the element is, the larger the divided voltage is in the series circuit. According to the principle, the resistance value of the capacitor at the edge of the lens and the resistor connected with the capacitor is very small, so that the voltage divided by the capacitor is very large; the closer the capacitive area is to the center of the lens, the greater the resistance connected thereto, and the smaller the voltage divided by the capacitance. Thus, the distribution that the voltage is gradually reduced from the edge of the lens to the center is formed at the high-resistance layer, and the Ez distribution in the space of the liquid crystal lens is consistent with the potential distribution trend because the thickness of the liquid crystal lens is constant; the electric potential of the region near the center is low, the electric potential of the region near the edge of the circle is high, and the spatial distribution of the z-direction component (Ez) of the electric field intensity in the diameter direction of the liquid crystal lens is as shown in fig. 3;

the relationship curve of Ez and the tilt angle of the liquid crystal molecules is a curve which monotonically increases (Ez is an abscissa and the tilt angle of the liquid crystal molecules is an ordinate), and the relationship curve of the tilt angle of the liquid crystal molecules and the effective refractive index is a curve which monotonically decreases. Therefore, the distribution of the effective refractive index in the liquid crystal lens along the diameter direction is the distribution in which the lens center gradually decreases to the edges of the two lenses, as shown in fig. 4;

the effective refractive index distribution of the liquid crystal lens can be adjusted by changing the amplitude and frequency of the driving voltage, so that the aim of zooming is fulfilled. Therefore, the spatial electric field intensity distribution of the lens is adjusted by optimizing the height of the high-resistance layer, so that the ideal refractive index distribution of the liquid crystal lens is further realized, and the imaging quality of the liquid crystal lens is finally improved.

As shown in fig. 5, the liquid crystal lens designed by the liquid crystal lens aberration optimization method includes a first substrate 1 and a second substrate 2 disposed opposite to each other, and a liquid crystal layer 3 disposed between the first substrate 1 and the second substrate 2; a first alignment layer 4 and a second alignment layer 5 respectively positioned at two sides of the liquid crystal layer 3 and facing the first substrate 1 and the second substrate 2, a first electrode layer 6 positioned between the second alignment layer 5 and the second substrate 2, a high resistance layer 7 positioned between the first alignment layer 4 and the first substrate 1, and a second electrode layer 8 connected with the outer edge of the high resistance layer 7 and positioned between the first alignment layer 4 and the first substrate 1; the height of the lower bottom surface of the high resistance layer 7 from the first electrode layer 6 is determined by the optimization method according to any of claims 1-2, and the gap between the high resistance layer 7 and the first alignment layer 4 is further provided with a spacer layer 9.

In this embodiment, the cushion layer 9 is a polymer layer, and the light transmittance of the polymer layer is 90%.

It should be noted that the reason why the gap between the high resistance layer 7 and the first alignment layer 4 is filled with the liner layer 9, and the glass material is not selected, is because the polymer can be easily processed into any curved surface, and the liner layer 9 is selected from a substance with higher light transmittance, which can better adapt to the refraction requirement, and is also easier to process.

Like this, adjust the high refracting index distribution that realizes the liquid crystal lens ideal to the height of high resistant layer 7 of high resistant layer type liquid crystal lens to improve the imaging quality of lens, in some lens that use fixed focus and need change focal plane's scene, do not need mechanical structure's drive to reach the purpose, the effective refracting index that liquid crystal lens itself can reach is close ideal refracting index, and imaging effect is good, facilitates the use.

In this embodiment, the first substrate 1 and the second substrate 2 are made of glass, and the light transmittance of the glass is at least 90%.

In this embodiment, the liquid crystal layer 3 is a nematic liquid crystal. Thus, the short-range interaction between molecules of nematic liquid crystal is weak, and the spontaneous alignment process in which the long axes of the molecules are parallel to each other can cause the liquid crystal to have high birefringence.

In this embodiment, the high resistance layer 7 and the second electrode layer 8 are electrically connected. In this way, the high-resistance layer 7 forms an equivalent circuit with the electrode layer 6 in an operating state by the electrical connection of the second electrode layer 8, and the potential between the high-resistance layer 7 and the first electrode layer 6 corresponds to the distance between the high-resistance layer 7 and the first electrode layer 6.

In this embodiment, the rubbing directions of the opposite sides of the first alignment layer 4 and the second alignment layer 8 are opposite.

In this embodiment, the high-resistance layer 7 is in a water wave shape from the center to the edge of the liquid crystal lens, and the electric field intensity at each position on the high-resistance layer 7 is matched with the ideal electric field intensity at the same position away from the center of the liquid crystal lens.

In this embodiment, the side of the first substrate 1 in contact with the high resistance layer 7 is matched with the wave-shaped surface of the high resistance layer 7, and the thickness of the second substrate 2 is 0.3 mm. Therefore, the thickness of the substrate is controlled within a certain range, the light transmission loss can be reduced, and the refraction effect is ensured.

In this embodiment, the high-resistance layer 7 is made of ZnO. Thus, the conductivity and the relative dielectric constant of the material are combined, and the high-resistance layer 7 selects the ZnO material with higher resistance value, so that the better effect is achieved.

Example 2

An application of a method for optimizing aberration of a liquid crystal lens, which utilizes height data of a high resistance layer in embodiment 1 to improve height distribution of the high resistance layer of a target liquid crystal lens, specifically comprises the following steps:

the height data of the high-resistance layer at each equal dividing point position calculated in the step 4 is used for firstly manufacturing the liner layer 9 and the height change corresponding to the first substrate 1, and then the high-resistance layer is manufactured on the liner layer by using the sputtering technology, so that the obtained liquid crystal lens has small aberration and high imaging quality.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.