A microlens array, pixel island 3D display device and preparation method thereof

Abstract

The present invention relates to the field of 3D display technology, and specifically to a microlens array, a pixel island 3D display device and a preparation method thereof, wherein the microlens array comprises: a first drive electrode, a liquid crystal film, a second drive electrode and an organic medium layer which are sequentially stacked along the light emitting direction of the display screen, a lens array structure is provided on the organic medium layer, and under the action of the voltage difference formed between the first drive electrode and the second drive electrode, the refractive index of the liquid crystal film is controlled to change in the direction of reducing the placement height of the edge sub-pixel, so as to adjust the focus of the edge sub-pixel to the corresponding focal arc surface. In summary, the design of the present application can achieve that the light emitted by the sub-pixel at any angle meets the conditions of focal plane collimated light emission, thereby ensuring that no matter where the human eye is, it can receive the best quality main lobe viewing area of ​​the light field 3D, thereby achieving ultra-low crosstalk, moiré and ultra-large visual space.

Description

Technical Field

[0001] The present invention relates to the field of 3D display technology, and in particular to a microlens array, a pixel island 3D display device and a preparation method thereof. Background Art

[0002] Among the five major human perception pathways, vision accounts for 70% to 80% of the information source, and about 50% of the brain's capacity is used to process visual information. From daily behavior to complex operations, it is highly dependent on our visual perception; however, the existing image acquisition and display loses multiple dimensions of visual information, which forces us to observe the three-dimensional world only through a two-dimensional "window"; light field display is our way of obtaining multi-dimensional visual information. It can simulate the way the human eye perceives light and focuses, dynamically focus on the area where the human eye is looking, and present a more natural sense.

[0003] Pixel island light field 3D display can gather pixels from multiple viewpoints together to achieve ultra-high pixel density, and can design monochrome pixel island lenses to solve dispersion problems and increase visible field of view. It has attracted widespread attention in the industry.

[0004] In the prior art, pixel island light field 3D displays mostly use a combination of pixel islands and fixed lenses (Lens). This combination method has aberrations for sub-pixels in different positions of the fixed lens, which can only ensure that light at a certain angle meets the conditions of focal plane collimated emission. This will inevitably cause the light field 3D image seen by the human eye to have large crosstalk and moiré changes as the observation angle changes, affecting the observation effect. Summary of the invention

[0005] The purpose of the present application is to provide a microlens array, a pixel island 3D display device and a preparation method thereof, so as to solve the technical problem that the prior art can only ensure that light at a certain angle meets the condition of focal plane collimated emission, thereby causing the light field 3D image seen by the human eye to have large crosstalk and moiré changes as the observation angle changes.

[0006] (I) Technical solution

[0007] To achieve the above-mentioned purpose, the first aspect of the present invention provides a microlens array, comprising: a first driving electrode, a liquid crystal film, a second driving electrode and an organic medium layer which are sequentially stacked along the light emitting direction of a display screen, wherein a lens array structure is provided on the organic medium layer, and under the action of a voltage difference formed between the first driving electrode and the second driving electrode, the refractive index of the liquid crystal film is controlled to change in a direction of reducing the placement height of the edge sub-pixel, so as to adjust the focus of the edge sub-pixel to the corresponding focal arc surface.

[0008] Optionally, the refractive index adjustment strategy of the liquid crystal film is as follows:

[0009] n=nx*ok / kf*(cosθ-1)+n1*cosθ;

[0010] Among them, θ is the angle between the off-axis light corresponding to the edge sub-pixel and the center of the lens; nx is the refractive index between the lens and the liquid crystal film; n1 is the refractive index of the liquid crystal film when the off-axis light is perpendicular to the lens; ok is the distance from the center of the lens to the liquid crystal film when the off-axis light is perpendicular to the lens; kf is the distance from the liquid crystal film to the light-emitting point when the off-axis light is perpendicular to the lens.

[0011] Optionally, the first driving electrode and the second driving electrode are both configured as a continuous structure.

[0012] Optionally, the first driving electrode and / or the first driving electrode is configured as a subdivision electrode.

[0013] Optionally, the subdivided electrodes correspond one-to-one to a plurality of sub-pixels.

[0014] Optionally, the microlens array further includes a plurality of adjustment structures arranged in a matrix, the lenses in the lens array structure are installed one-to-one in the adjustment structures, and the plurality of lenses are all made of electrostrictive materials. Under the action of the adjustment structures, the field controls the lenses to deform in a direction of reducing their arch height.

[0015] Optionally, the plurality of adjustment structures correspond one-to-one to the plurality of sub-pixels.

[0016] Optionally, the regulating structure includes:

[0017] A third driving electrode electrically connected to the outer side of the organic dielectric layer;

[0018] and a fourth driving electrode, which is spaced above the third driving electrode via a supporting structure, and the lens is installed in a space formed between the third driving electrode and the fourth driving electrode.

[0019] Optionally, the outer side of the lens array structure is also wrapped with a flat layer.

[0020] To achieve the above objectives, the second aspect of the present invention provides a pixel island 3D display device, comprising: a display screen and a microlens array as described in any one of the above, wherein the microlens array is arranged on the light emitting surface side of the display screen.

[0021] To achieve the above object, the third aspect of the present invention provides a method for preparing a microlens array, wherein the microlens array comprises: a first driving electrode, a liquid crystal film, and a second driving electrode, and the method comprises:

[0022] Installing the first driving electrode, the liquid crystal film and the second driving electrode in sequence along the light emitting direction of the display screen;

[0023] forming an organic dielectric layer on a side of the second driving electrode away from the liquid crystal film;

[0024] A lens array structure is formed on a side of the organic medium layer away from the second driving electrode.

[0025] Optionally, the first driving electrode and the second driving electrode are both arranged as a continuous structure, and the arrangement range covers a plurality of sub-pixels.

[0026] Optionally, the first driving electrode and / or the first driving electrode is configured as a subdivided electrode corresponding to a plurality of sub-pixels on a one-to-one basis.

[0027] (II) Beneficial effects

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] The present invention provides a microlens array, a pixel island 3D display device and a preparation method thereof. The microlens array comprises: a first driving electrode, a liquid crystal film, a second driving electrode and an organic medium layer which are sequentially stacked along the light emitting direction of a display screen. A lens array structure is arranged on the organic medium layer. Under the action of a voltage difference formed between the first driving electrode and the second driving electrode, the refractive index of the liquid crystal film is controlled to change in a direction of reducing the placement height of edge sub-pixels, so as to adjust the focus of the edge sub-pixels to the corresponding focal arc surface.

[0030] like Figure 1 As shown, the off-axis light of the 0-degree field of view and the on-axis light passing through the principal point o can intersect on the image plane to complete the imaging; while the off-axis light of the θ-degree field of view and the on-axis light passing through the principal point o cannot intersect at one point on the image plane, and cannot complete the imaging, and a diffuse spot bc is formed; at this time, the present application reduces the voltage difference formed by the first driving electrode and the second driving electrode to reduce the refractive index of the liquid crystal film, thereby reducing the placement height of the θ-degree edge sub-pixel, and finally adjusting the focus of the off-axis light corresponding to the θ-degree edge sub-pixel from the bc position to the a position to fall on the corresponding focal arc surface. In summary, the design of the present application can achieve that the light emitted by the sub-pixel at any angle meets the conditions of focal plane collimated light emission, thereby ensuring that no matter where the human eye is, it can receive the best main lobe viewing area of ​​the light field 3D, thereby achieving ultra-low crosstalk, moiré and ultra-large visual space. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings required for use in the embodiments or the prior art description are briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0033] Figure 1 It is a pattern in which pixels in a pixel island in the prior art are arranged with a continuous light-emitting surface;

[0034] Figure 2 It is a pattern in which pixels in a pixel island in the prior art are arranged with a periodic optical compensation continuous light-emitting surface;

[0035] Figure 3 Is adopted Figure 1 or Figure 2 The viewpoint map arrangement formed by the pixel island and the fixed lens.

[0036] Figure 4 It is the viewpoint diagram arrangement corresponding to the change of the viewing angle of the human eye;

[0037] Figure 5 yes Figure 4 The corresponding two eyes receive the crosstalk change diagram between the viewpoints;

[0038] Figure 6 is a light path diagram of the 3D light field display device of the present invention;

[0039] Figure 7 is a schematic structural diagram of a microlens array shown in Embodiment 1 of the present invention;

[0040] Figure 8 is a schematic diagram of a method for preparing a microlens array shown in Example 1 of the present invention;

[0041] Fig. 9 is a diagram showing changes in crosstalk between viewpoints received by two eyes as shown in the first embodiment of the present invention;

[0042] Fig.10 is a diagram showing the relationship between the refractive index of the liquid crystal film and the voltage in the first embodiment of the present invention;

[0043] Fig.11 is a schematic structural diagram of a microlens array shown in Embodiment 2 of the present invention;

[0044] Fig.12 is a diagram showing changes in crosstalk between viewpoints received by two eyes as shown in the second embodiment of the present invention;

[0045] Fig.13 is a schematic structural diagram of a microlens array shown in Embodiment 3 of the present invention;

[0046] Fig.14 is a schematic structural diagram of a microlens array according to a fourth embodiment of the present invention;

[0047] Fig.15 yes Fig.14 Top view of the microlens array before the printed lenses.

[0048] In the figure: 1. first driving electrode; 2. liquid crystal film; 3. second driving electrode; 4. organic medium layer; 5. lens; 6. display screen; 7. sub-pixel; 8. third driving electrode; 9. fourth driving electrode; 10. supporting structure; 11. flat layer; 12. off-axis light of 0 degree field of view; 13. off-axis light of θ degree field of view; 14. on-axis light; 15. focal arc surface; 16. image plane; 17. first line electrode; 18. second line electrode. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] In the prior art, pixel island light field 3D displays mostly use a combination of pixel islands and a fixed lens 5 (Lens). This combination method has aberrations for sub-pixels 7 at different positions of the fixed lens 5, which can only ensure that light at a certain angle meets the conditions of focal plane collimated emission. This will inevitably cause the light field 3D image seen by the human eye to have large crosstalk and moiré changes as the observation angle changes, affecting the observation effect.

[0051] Specifically, Figure 1 , Figure 2 The following is an existing arrangement scheme of pixel island light field 3D. Regardless of whether the pixels are arranged in a continuous light-emitting surface, Figure 1 As shown, the continuous light-emitting surface arrangement of periodic optical compensation is as follows Figure 2 As shown, with the focal plane design of the fixed lens 5, the following will appear Figure 3 The viewpoint diagram shown in the figure changes as the viewing angle of the human eye changes. Figure 4 As shown, the crosstalk changes between the viewpoints received by the two eyes are as follows Figure 5 As shown, it can be seen that as the viewing angle of the human eye changes, the 3D crosstalk will also increase. When the crosstalk increases by more than 10%, observation discomfort will occur due to the ghosting that can be distinguished by the human eye, which seriously limits the visible space of the light field 3D.

[0052] The reasons for the above problems are as follows Figure 6 As shown, after the collimated light rays of different fields of view in the object space pass through the lens 5, the focal plane generated in the image space is not a plane, but a curved surface with a certain curvature, which is called field curvature. However, the display screen 6 and the pixel light-emitting surface are the same as the image plane 16, which is a plane. Therefore, when the display screen 6 is adjusted to the focal position with a 0-degree field of view, the pixels in the large viewing angle direction will be defocused relative to the lens 5; for example, when the off-axis light rays of the 0-degree field of view and the on-axis light rays 14 passing through the principal point o can intersect on the image plane 16 to complete the image; while the off-axis light rays 13 of the θ-degree field of view and the on-axis light rays 14 passing through the principal point o cannot intersect at one point on the image plane 16, the image cannot be completed, and a diffuse spot bc is formed.

[0053] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments:

[0054] Embodiment 1

[0055] In order to solve the above technical problems, Figure 7-Figure 9 As shown, the present application provides a microlens 5 array, comprising: a first driving electrode 1, a liquid crystal film 2, a second driving electrode 3 and an organic medium layer 4 which are sequentially stacked along the light emitting direction of a display screen 6, preferably, the first driving electrode 1 and the second driving electrode 3 are both arranged as a continuous structure, wherein the first driving electrode 1 and the second driving electrode 3 cover all sub-pixels 7; in a specific embodiment, the outer side of the lens 5 array structure is also wrapped with a flat layer 11; a lens 5 array structure is arranged on the organic medium layer 4, wherein the lens shape shown in this embodiment is not limited to the spherical shape shown in the figure, but can also be applied to cylindrical lenses, and the shape of the lens is not limited in this embodiment; under the action of the voltage difference formed between the first driving electrode 1 and the second driving electrode 3, the refractive index of the liquid crystal film 2 is controlled to change in the direction of reducing the placement height of the edge sub-pixel 7, so as to adjust the focus of the edge sub-pixel 7 to the corresponding focal arc surface 15.

[0056] Specifically, the placement height refers to the distance between the light-emitting surface and the highest point of the lens 5. Assuming that the focal length of the lens 5 is f, the refractive index of the organic medium layer 4 is n3, and the thickness is l3, the refractive index of the second driving electrode 3 is n2, and the thickness is l2, the refractive index of the liquid crystal film 2 is na, and the thickness is la, the refractive index of the first driving electrode 1 is n1, and the thickness is l1, the refractive index from the light-emitting surface to the first driving electrode 1 is n0, and the thickness is l0, then the placement height is L=n0*l0+n1*l1+n2*l2+n3*l3+na*la.

[0057] In a preferred embodiment, the refractive index adjustment strategy of the liquid crystal film 2 is as follows:

[0058] n=nx*ok / kf*(cosθ-1)+n1*cosθ;

[0059] Among them, θ is the angle between the off-axis light corresponding to the edge sub-pixel 7 and the center of the lens 5; nx is the refractive index between the lens 5 and the liquid crystal film 2; n1 is the refractive index of the liquid crystal film 2 when the off-axis light is perpendicular to the lens 5; ok is the distance from the center of the lens 5 to the liquid crystal film 2 when the off-axis light is perpendicular to the lens 5; kf is the distance from the liquid crystal film 2 to the light-emitting point when the off-axis light is perpendicular to the lens 5; in this embodiment, nx=n3+n2.

[0060] In the prior art, when the human eye views the screen at an angle of θ, that is, at this time, the sub-pixel 7 corresponding to the human eye is at an edge position, and the light generated by it has an angle of θ with the center of the lens 5. Therefore, the off-axis light generated by the sub-pixel 7 and the on-axis light 14 passing through the principal point o cannot intersect at one point on the image plane 16, and the image cannot be perfected. A diffuse spot bc is formed, which will appear as follows: Figure 5 The crosstalk in the large viewing angle direction shown in the figure increases. At this time, the placement height corresponding to the above-mentioned sub-pixel 7 can be reduced to adjust its focus to the focal plane; in order to achieve the above-mentioned technical effect, the present application reduces the voltage difference formed by the first driving electrode 1 and the second driving electrode 3 to reduce the refractive index of the liquid crystal film 2, that is, the refractive index of the liquid crystal film 2 is reduced from the current na to nb, wherein the value of the refractive index nb can be determined according to the refractive index adjustment strategy of the above-mentioned liquid crystal film 2; thereby reducing the placement height of the θ-degree edge sub-pixel 7, and finally adjusting the focus of the off-axis light corresponding to the θ-degree edge sub-pixel 7 from the bc position to the a position, so as to fall on the corresponding focal arc surface 15, thereby ensuring the collimation of the light output when viewed at this angle, and finally obtaining the following Fig. 9 Crosstalk curve shown; In summary, the design of the present application can ensure that the light emitted by the sub-pixel 7 at any angle meets the condition of focal plane collimated light emission, thereby ensuring that no matter where the human eye is, it can receive the highest quality main lobe viewing area of ​​the light field 3D, thereby achieving ultra-low crosstalk, moiré and ultra-large visual space.

[0061] That is to say, it is only necessary to determine which sub-pixel 7 corresponds to the human eye, so as to determine the angle between the sub-pixel 7 and the center of the lens 5, thereby ensuring that the light output from the sub-pixel 7 is collimated, so as to satisfy the optimal display effect no matter at which angle the human eye is viewing, so as to minimize crosstalk and moiré. In order to determine the position of the human eye in this embodiment, the present application is preferably combined with the human eye tracking technology. Specifically, the human eye is photographed in real time by a camera device, and the pupil position is located by image processing technology to obtain the coordinates of the pupil center, and the gaze point of the human eye is calculated to determine the position of the sub-pixel 7 corresponding to the current human eye. Of course, the technology for determining the gaze point of the human eye is not limited to the human eye tracking technology shown in the above embodiment. Other devices that can achieve the above technical effects are applicable to this solution and belong to the protection scope of this application.

[0062] The specific adjustment process is as follows: after the gaze point of the human eye is determined by using the eye tracking technology, the sub-pixel 7 corresponding to the gaze point can be determined. Since the angle between the sub-pixel 7 and the center of the lens 5 is known, the refractive index nb of the liquid crystal film 2 required after adjustment can be calculated according to the above formula. Then, according to Fig.10 The corresponding relationship between the refractive index of the liquid crystal film 2 and the required voltage is shown, and the voltage value required to adjust the refractive index of the liquid crystal film 2 to nb is determined, and the voltage difference between the first driving electrode 1 and the second driving electrode 3 is adjusted according to the calculated voltage value. For example, when the required refractive index nb of the liquid crystal film 2 after adjustment is 1.58 according to the above calculation, the focus of the light at this position can return to the focal arc surface 15, and the output light can be collimated, thereby reducing crosstalk and moiré. Fig.10 As shown, the required voltage value is determined to be 3V. At this time, it is only necessary to reduce the voltage difference between the first driving electrode 1 and the second driving electrode 3 to 3V. The adjustment process of other gaze points of the human eye is the same as above, so it will not be repeated here.

[0063] To achieve the above objectives, the second aspect of the present invention provides a pixel island 3D display device, characterized in that it includes: a display screen 6 and a microlens 5 array as described in any one of the above, wherein the microlens 5 array is arranged on the light emitting surface side of the display screen 6.

[0064] To achieve the above object, the third aspect of the present invention provides a method for preparing a microlens 5 array, the method comprising:

[0065] S1: installing the first driving electrode 1, the liquid crystal film 2 and the second driving electrode 3 in sequence along the light emitting direction of the display screen 6;

[0066] Preferably, both the first driving electrode 1 and the second driving electrode 3 are configured as a continuous structure, and the configuration range covers a plurality of sub-pixels 7 .

[0067] S2: forming an organic medium layer 4 on a side of the second driving electrode 3 away from the liquid crystal film 2;

[0068] S3: A lens 5 array structure corresponding to a plurality of sub-pixels 7 is formed on a side of the organic medium layer 4 away from the second driving electrode 3 .

[0069] Embodiment 2

[0070] Compared with the microlens 5 array provided in the first embodiment, the microlens 5 array provided in this embodiment has the following differences: Fig.10 and Fig.11 As shown, one of the first driving electrode 1 and the second driving electrode 3 is configured as a subdivided electrode, and the other is configured as a continuous structure. In a specific embodiment, as shown in FIG. Fig.10 As shown, the first driving electrode 1 is set as a continuous structure, and the second driving electrode 3 is set as a subdivided electrode. Preferably, the subdivided electrode corresponds to a plurality of sub-pixels 7 one by one. Specifically, after multiple tests using the solution of the first embodiment, the voltage difference required for adjusting each sub-pixel 7 is determined, and then the second driving electrode 3 shown in the first embodiment is refined so that the required voltage difference is applied to the second driving electrode 3 corresponding to each sub-pixel 7. When work is required, it is only necessary to turn on the power supply to turn on all the sub-pixels 7. In summary, the design of this embodiment can adjust the focus of each sub-pixel 7 to the focal arc surface 15 without the need for human eye tracking technology, thereby maintaining a low crosstalk level. Similarly, the refinement process of the first driving electrode 1 is the same as the above process, so it will not be described in detail here.

[0071] To achieve the above object, the present invention provides a method for preparing a microlens 5 array, the method comprising:

[0072] The first driving electrode 1, the liquid crystal film 2 and the second driving electrode 3 are sequentially installed along the light emitting direction of the display screen 6;

[0073] Specifically, the first driving electrode 1 is installed on the light emitting surface side of the display screen 6, wherein the first driving electrode 1 is set as a continuous structure, and the setting range is to cover multiple sub-pixels 7. The liquid crystal film 2 is installed on the side of the first driving electrode 1 away from the display screen 6; the second driving electrode 3 is installed on the side of the liquid crystal film 2 away from the first driving electrode 1; wherein the second driving electrode 3 is set as a subdivided electrode corresponding to the multiple sub-pixels 7 one by one.

[0074] An organic medium layer 4 is formed on a side of the second driving electrode 3 away from the liquid crystal film 2;

[0075] A lens 5 array structure corresponding to a plurality of sub-pixels 7 is formed on a side of the organic medium layer 4 away from the second driving electrode 3 .

[0076] Embodiment 3

[0077] Compared with the microlens 5 array provided in the first embodiment, the microlens 5 array provided in this embodiment has the following differences: Fig.13 As shown, the first driving electrode 1 and the second driving electrode 3 are both configured as subdivided electrodes.

[0078] According to an embodiment of the present invention, the subdivided electrode corresponds to multiple sub-pixels 7 one by one. Of course, it is also possible to adopt a method in which each sub-electrode in the subdivided electrode corresponds to multiple sub-pixels 7. Of course, the resolution corresponding to the one-to-many setting is lower than the resolution corresponding to the one-to-many setting. In actual use, it is preferred to adopt a method in which multiple sub-electrodes in the subdivided electrode correspond to the sub-pixels 7 one by one. On the one hand, the resolution can be guaranteed, and on the other hand, each sub-pixel 7 can be precisely controlled. In summary, the design of this embodiment can realize the precise control of the refractive index of the liquid crystal film 2 corresponding to each sub-pixel 7 through a group of first drive electrodes 1 and second drive electrodes 3. After the sub-pixel 7 corresponding to the gaze point of the human eye is determined, it is only necessary to reduce the voltage difference generated by the first drive electrode 1 and the second drive electrode 3 corresponding to the position, and the voltage difference generated by the first drive electrode 1 and the second drive electrode 3 at other positions remains unchanged.

[0079] Embodiment 4

[0080] Compared with the microlens 5 array provided in the first embodiment, the microlens 5 array provided in this embodiment has the following differences: Fig.14 and Fig.15 As shown, the microlens 5 array also includes a plurality of adjustment structures arranged in a matrix, the lenses 5 in the lens 5 array structure are installed one-to-one in the adjustment structure, and the plurality of lenses 5 are made of electrostrictive material. Under the action of the adjustment structure, the field controls the lens 5 to deform in the direction of reducing its arch height; preferably, the plurality of adjustment structures correspond one-to-one to the plurality of sub-pixels 7.

[0081] Exemplarily, the electrostrictive material may be polyurethane, polyvinylidene fluoride or the like, which can be deformed under the control of the field; and the plurality of lenses 5 are correspondingly mounted on the plurality of adjustment structures; wherein, under the action of the adjustment structure, the field controls the lens 5 to deform in the direction of reducing its arch height. Preferably, the field is set to an electric field, and of course, it can also be set to a magnetic field. As long as the field can realize the deformation of the lens 5, it is applicable to the present solution. For the sake of ease of understanding, the following detailed description is given with the field being set to an electric field.

[0082] Furthermore, in order to ensure accurate control of the lens 5, the shape of the adjustment structure is adapted to the shape of the lens 5. Preferably, as Fig.14 As shown, in this embodiment, the lens 5 is a circular convex lens 5 structure, so correspondingly, the adjustment structure is set to be circular. Of course, in the microlens 5 array, the shape of the lens 5 and the shape corresponding to the adjustment structure are not limited to the above-mentioned circular structure, and other structures may also be used, for example, square, hexagonal and other structures. In this embodiment, the shape is not limited.

[0083] In order to ensure that when the first driving electrode 1 and the second driving electrode 3 cannot work normally, the placement height of the edge sub-pixel 7 can still be lowered to a position where its focus is on the corresponding focal arc surface 15; or when it is detected that the focus of the edge sub-pixel 7 is not smoothly adjusted to the corresponding focal arc surface 15 after the pressure difference is adjusted by the first driving electrode 1 and the second driving electrode 3, in order to achieve the above technical effect, in this embodiment, it is proposed that each lens 5 in the lens 5 array structure is made of an electrostrictive material, and correspondingly, each lens 5 is provided with an adjustment structure, and the field generated by the adjustment structure is used to reduce each lens 5. The arch height of each lens 5 in the vertical direction is used to reduce the placement height of the edge sub-pixel 7, thereby adjusting the focus of the edge sub-pixel 7 to the corresponding focal arc surface 15; specifically, when the field is negative, the corresponding lens 5 will be deformed along the vertical direction to reduce its arch height in the vertical direction, thereby reducing the placement height of the edge sub-pixel 7; as the field intensity changes, the corresponding lens 5 deformation degree, that is, the arch height also changes accordingly. Specifically, as the field intensity increases, the greater the deformation degree of the corresponding lens 5, the more the arch height is reduced, and the smaller the placement height of the edge sub-pixel 7.

[0084] In a preferred embodiment, Fig.14 As shown, the regulating structure includes:

[0085] A third driving electrode 8 is electrically connected to the outer side of the organic dielectric layer 4;

[0086] The fourth driving electrode 9 is arranged above the third driving electrode 8 via a support structure 10, and the lens 5 is installed in the space formed between the third driving electrode 8 and the fourth driving electrode 9. Preferably, the support structure 10 is arranged as a support column.

[0087] Specifically, Fig.14As shown, a space for the lens 5 to deform is formed between the third driving electrode 8 and the fourth driving electrode 9 through the support structure 10. When working, an electric field with adjustable strength will be generated between the third driving electrode 8 and the fourth driving electrode 9, and the electric field will penetrate the lens 5 made of the electrostrictive material with high transmittance, so that the lens 5 is deformed along the direction of the electric field. In this embodiment, in order to change the arch height of the lens 5 in the vertical direction, the third driving electrode 8 and the fourth driving electrode 9 are arranged at intervals along the vertical direction through the support structure 10. For ease of understanding, the direction in which the fourth driving electrode 9 diverges the electric field to the third driving electrode 8 is set to be reverse. When it is necessary to reduce the placement height of the edge sub-pixel 7, it is only necessary to reduce the arch height of the corresponding lens 5. At this time, it is only necessary to ensure that the fourth driving electrode 9 diverges the negative electric field to the third driving electrode 8. At this time, the lens 5 corresponding to the edge sub-pixel 7 will be deformed in the direction of reducing the arch height along the vertical direction under the action of the negative electric field, so that the placement height of the edge sub-pixel 7 is reduced.

[0088] According to one embodiment of the present invention, Fig.14 and Fig.15 As shown, the microlens 5 array is further provided with a plurality of aggregation structures, and the plurality of aggregation structures correspond to the plurality of adjustment structures, and are used to prevent compatible adhesion between each two adjacent lenses 5; specifically, in this solution, the initial state of the lens 5 is a droplet, and is printed onto the corresponding third driving electrode 8 by printing technology, and finally formed into the lens 5 by solidification. In order to avoid compatible adhesion between each two connected droplets during the printing process, which affects the formation of the lens 5, this solution adds an aggregation structure to avoid the above technical problems. In one embodiment, the aggregation structure includes:

[0089] The first line electrode 17 is electrically connected to the outer side of the organic dielectric layer 4 ; the outer side of the first line electrode 17 is coated with an insulating layer, and the third driving electrode 8 is electrically connected to a side of the insulating layer away from the organic dielectric layer 4 .

[0090] The second wire electrodes 18 are staggered above the first wire electrodes 17, and the lens 5 is installed in the area formed by the staggered second wire electrodes 18 and the first wire electrodes 17; through the cooperation of the first wire electrodes 17 and the second wire electrodes 18, the lens 5 droplets are gathered in the above-mentioned area without spreading out of the area.

[0091] In another embodiment, the aggregation structure is configured as a hydrophobic layer, and the hydrophobic layer is disposed on the side wall surface of the support structure 10 close to the lens 5; so that the surface tension of the side wall surface and the lower wall surface of the support structure 10 close to the lens 5 are different, thereby ensuring that the lens 5 droplets are aggregated between two adjacent support columns and will not remain on the side wall surface of the support structure 10, thereby ensuring the molding effect of the lens 5.

[0092] In one embodiment, the aggregation structure includes: a micro-nano structure composed of a plurality of spaced-apart protrusion structures, and the spacing between the protrusion structures in each micro-nano structure is the same. Under the aggregation effect of the micro-nano structure, the lens 5 droplets will be gathered on the micro-nano structure without diffusion, thereby ensuring the forming effect of the droplets. Among them, the specific micro-nano structure can be selected from micro-nano gratings, pits, protrusions and other structures. In this embodiment, micro-nano gratings are preferably selected.

[0093] Each embodiment in this specification is described in a progressive manner, and some embodiments focus on the differences from other embodiments. The same or similar parts between the embodiments can be referenced to each other.

[0094] It should be noted that, in the specification and claims of the present application and the above-mentioned drawings, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or specific order or precedence between these entities or operations. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example.

[0095] Moreover, the terms "comprises," "comprising," and "having," and any variations thereof or any other variants thereof, are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements, but also other elements not expressly listed, or also includes elements inherent to such process, method, article, or apparatus. For example, a process, method, system, product, or apparatus comprising a series of steps or units need not be limited to those steps or units expressly listed, but may include other steps or units not expressly listed or inherent to such process, method, product, or apparatus. In the absence of further limitations, an element defined by the statement "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus comprising the element.

[0096] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0097] The above description is only a specific implementation mode of the present application, so that those skilled in the art can understand or implement the present application. It will be obvious to those skilled in the art that various modifications and variations to these embodiments, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features applied for herein.

Claims

1. A microlens array, characterized in that: include: A first driving electrode, a liquid crystal film, a second driving electrode and an organic medium layer are sequentially stacked along the light emitting direction of the display screen. A lens array structure is provided on the organic medium layer. Under the action of the voltage difference formed between the first driving electrode and the second driving electrode, the refractive index of the liquid crystal film is controlled to change in the direction of reducing the placement height of the edge sub-pixel, so as to adjust the focus of the edge sub-pixel to the corresponding focal arc surface. The placement height is the distance between the light emitting surface and the highest point of the lens. The outer side of the lens array structure is also wrapped with a flat layer.

2. The microlens array according to claim 1, characterized in that: The refractive index adjustment strategy of the liquid crystal film is as follows: n=nx*ok / kf*(cosθ-1)+n1*cosθ; Among them, θ is the angle between the off-axis light corresponding to the edge sub-pixel and the center of the lens; nx is the refractive index between the lens and the liquid crystal film; n1 is the refractive index of the liquid crystal film when the off-axis light is perpendicular to the lens; ok is the distance from the center of the lens to the liquid crystal film when the off-axis light is perpendicular to the lens; kf is the distance from the liquid crystal film to the light-emitting point when the off-axis light is perpendicular to the lens.

3. The microlens array according to claim 1, characterized in that: The first driving electrode and the second driving electrode are both arranged in a continuous structure.

4. The microlens array according to claim 1, characterized in that: The first driving electrode and / or the first driving electrode is configured as a subdivided electrode.

5. The microlens array according to claim 4, characterized in that: The subdivided electrodes correspond to a plurality of sub-pixels one by one.

6. The microlens array according to claim 1, characterized in that: The microlens array also includes a plurality of adjustment structures arranged in a matrix, the lenses in the lens array structure are installed in the adjustment structures one by one, and the plurality of lenses are all made of electrostrictive materials. Under the action of the adjustment structures, the field controls the lenses to deform in the direction of reducing their arch height.

7. The microlens array according to claim 6, characterized in that: The plurality of adjustment structures correspond one-to-one to the plurality of sub-pixels.

8. The microlens array according to claim 6, characterized in that: The regulatory structure comprises: A third driving electrode electrically connected to the outer side of the organic dielectric layer; and a fourth driving electrode, which is spaced above the third driving electrode via a supporting structure, and the lens is installed in a space formed between the third driving electrode and the fourth driving electrode.

9. A pixel island 3D display device, characterized in that: include: A display screen and a microlens array as claimed in any one of claims 1 to 8, wherein the microlens array is arranged on a light emitting surface side of the display screen.

10. A method for preparing a microlens array, characterized in that: For preparing a microlens array as claimed in any one of claims 1 to 8, the microlens array comprising: a first driving electrode, a liquid crystal film and a second driving electrode, the method comprising: The first driving electrode, the liquid crystal film and the second driving electrode are sequentially installed along the light emitting direction of the display screen; forming an organic dielectric layer on a side of the second driving electrode away from the liquid crystal film; A lens array structure is formed on a side of the organic medium layer away from the second driving electrode; Under the action of the voltage difference formed between the first driving electrode and the second driving electrode, the refractive index of the liquid crystal film is controlled to change in the direction of lowering the placement height of the edge sub-pixel, so as to adjust the focus of the edge sub-pixel to the corresponding focal arc surface. The placement height is the distance between the light emitting surface and the highest point of the lens. The outer side of the lens array structure is also wrapped with a flat layer.

11. The method for preparing a microlens array according to claim 10, characterized in that: The first driving electrode and the second driving electrode are both arranged in a continuous structure, and the arrangement range covers a plurality of sub-pixels.

12. The method for preparing a microlens array according to claim 10, characterized in that: The first driving electrodes and / or the first driving electrodes are configured as subdivided electrodes corresponding to a plurality of sub-pixels on a one-to-one basis.

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