Dual-frequency liquid crystal microlens array and naked eye 3D display device

Abstract

The invention provides a double-frequency liquid crystal microlens array and a naked eye 3D display device, and relates to the technical field of 3D display, the double-frequency liquid crystal microlens array comprises an upper substrate glass layer, an upper substrate electrode layer, an upper substrate polymer layer, a lower substrate orientation layer, a lower substrate electrode layer and a lower substrate glass layer which are arranged in sequence; a dual-frequency liquid crystal is arranged between the upper substrate polymer layer and the lower substrate orientation layer; the double-frequency liquid crystal forms a plurality of array units, the upper substrate polymer layer forms a plurality of curved surface array units, and the array units formed by the double-frequency liquid crystal and the array units formed by the upper substrate polymer layer have the same pitch. According to the dual-frequency liquid crystal microlens array, the dual-frequency liquid crystal material is adopted to develop the liquid crystal microlens, the orientation of liquid crystals is controlled through the frequency and size of an electric field, and different refractive index distributions are obtained.

Description

Technical Field

[0001] The present application relates to the field of 3D display technology, and in particular to a dual-frequency liquid crystal microlens array and a naked-eye 3D display device. Background Art

[0002] At present, naked-eye cylindrical lens grating 3D display has problems such as viewing fatigue, crosstalk of 3D images, high cost of film source production and insufficient film source. Therefore, naked-eye 3D display with 2D / 3D switchable display performance can enable users to choose 2D mode or 3D mode according to the experience requirements of different film sources. However, the current 2D / 3D switchable display device has the disadvantage of complex structure. Summary of the invention

[0003] The embodiments of the present application provide a dual-frequency liquid crystal microlens array and a naked-eye 3D display device, which can effectively solve the problem that the current 2D / 3D switchable display device has the disadvantage of complex structure.

[0004] The specific technical solution of this embodiment is as follows:

[0005] On the one hand, the present embodiment provides a dual-frequency liquid crystal microlens array, comprising an upper substrate glass layer, an upper substrate electrode layer, an upper substrate polymer layer, a lower substrate alignment layer, a lower substrate electrode layer and a lower substrate glass layer arranged in sequence; a dual-frequency liquid crystal is arranged between the upper substrate polymer layer and the lower substrate alignment layer; the dual-frequency liquid crystal forms a plurality of array units, the upper substrate polymer layer forms a plurality of array units, and the array units formed by the dual-frequency liquid crystal and the array units formed by the upper substrate polymer layer have the same pitch.

[0006] In some of the embodiments, the distance between the upper substrate polymer layer and the lower substrate alignment layer is 20-30 μm.

[0007] In some embodiments, the upper substrate glass layer, the upper substrate polymer layer, and the lower substrate glass layer have the same refractive index.

[0008] In some of the embodiments, the refractive index of the upper substrate glass layer, the upper substrate polymer layer and the lower substrate glass layer is 1-2.

[0009] In some of the embodiments, the upper substrate electrode layer and / or the lower substrate electrode layer adopts a planar indium tin oxide electrode.

[0010] On the other hand, this embodiment provides a naked-eye 3D display device based on a dual-frequency liquid crystal microlens array, comprising the dual-frequency liquid crystal microlens array of any one of the above embodiments, and also comprising a 2D display screen, which is arranged on a side close to the lower substrate glass layer.

[0011] In some embodiments, the array units formed by the dual-frequency liquid crystal and the array units formed by the upper substrate polymer layer have the same pitch:

[0012]

[0013] Among them, w is the pitch, m is the number of viewpoints in 3D mode, Q is the pupil distance of the human eye, and W P is the sub-pixel width of the 2D display.

[0014] In some of the embodiments, it is characterized in that the 2D display screen and the dual-frequency liquid crystal microlens array are arranged in close contact with each other, and the distance between the two is 0.

[0015] Compared with the prior art, the embodiments of the present application have the following beneficial effects:

[0016] (1) The dual-frequency liquid crystal microlens array provided in the embodiment of the present application uses dual-frequency liquid crystal materials to manufacture liquid crystal microlenses, and controls the orientation of liquid crystals by the frequency and magnitude of the electric field to obtain different refractive index distributions. The light beam is defocused or focused by matching or mismatching the different refractive indices of the dual-frequency liquid crystals with the refractive index of the curved polymer array layer, thereby realizing 2D / 3D switchable display.

[0017] (2) The dual-frequency liquid crystal microlens array provided in the embodiment of the present application adopts a planar electrode structure, the electrode structure is simple, and the electric field distribution is uniform. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 is a schematic diagram of the structure of a dual-frequency liquid crystal microlens array provided in some embodiments of the present application;

[0020] Figure 2 is a schematic diagram of application scenarios of dual-frequency liquid crystal microlens arrays provided in some embodiments of the present application;

[0021] Figure 3 is a schematic diagram of application scenarios of dual-frequency liquid crystal microlens arrays provided in other embodiments of the present application;

[0022] in:

[0023] 2. 2D display screen; 10. upper substrate glass layer; 20. upper substrate electrode layer; 30. upper substrate polymer layer; 40. lower substrate orientation layer; 50. lower substrate electrode layer; 60. lower substrate glass layer; 70. dual-frequency liquid crystal. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this application.

[0025] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0026] “A and / or B” includes the following three combinations: A only, B only, and a combination of A and B.

[0027] The use of "suitable for" or "configured to" in this application is meant to be open and inclusive language, which does not exclude devices that are suitable for or configured to perform additional tasks or steps. In addition, the use of "based on" is meant to be open and inclusive, because the process, step, calculation or other action "based on" one or more stated conditions or values ​​can be based on additional conditions or values ​​beyond the stated values ​​in practice.

[0028] In this application, the word "exemplary" is used to mean "used as an example, illustration, or description." Any embodiment described in this application as "exemplary" is not necessarily to be construed as being preferred or advantageous over other embodiments. The following description is given to enable any technician in the field to implement and use the present application. In the following description, details are listed for the purpose of explanation. It should be understood that a person of ordinary skill in the art can recognize that the present application can be implemented without using these specific details. In other instances, well-known structures and processes will not be elaborated in detail to avoid obscuring the description of the present application with unnecessary details. Therefore, the present application is not intended to be limited to the embodiments shown, but is consistent with the widest scope consistent with the principles and features disclosed in the present application.

[0029] The study found that:

[0030] In order to realize 2D / 3D switchable display on a naked-eye 3D display, a feasible solution is to study a device with adjustable focusing state to replace the cylindrical lens grating with fixed focal length. After the device is assembled with a 2D display screen, a 2D / 3D switchable display is formed.

[0031] In specific examples, a liquid lens array, a combination of a polarization light converter and a polymer column lens array, and a liquid crystal microlens array can be used as a device with adjustable focusing state. Liquid lenses have defects such as gravity effects, bubbles, and liquid volatilization that affect the stability of the liquid, and the combination of polarization light converters has the defect of complex structure. Liquid crystal materials have better performance and stability than liquid materials, and liquid crystal microlens arrays are a more ideal solution. However, in the current liquid crystal microlens array technology solution, there are also problems such as complex patterned electrode structure and unsatisfactory electric field distribution.

[0032] Based on the above research, on the one hand, the present application embodiment provides a dual-frequency liquid crystal microlens array, see Figure 1 , including an upper substrate glass layer 10, an upper substrate electrode layer 20, an upper substrate polymer layer 30, a lower substrate alignment layer 40, a lower substrate electrode layer 50 and a lower substrate glass layer 60 arranged in sequence. A dual-frequency liquid crystal 70 material is arranged between the upper substrate polymer layer 30 and the lower substrate alignment layer 40. The dual-frequency liquid crystal 70 forms a plurality of array units, and the upper substrate polymer layer 30 can also be regarded as being composed of a plurality of curved array units. Among them, the array units formed by the dual-frequency liquid crystal 70 and the array units formed by the upper substrate polymer layer 30 have the same pitch w.

[0033] Through the arrangement of the above embodiment, the dual-frequency liquid crystal microlens array is used to be assembled with the 2D display screen 2 to form a 2D / 3D switchable display. By using the dual-frequency liquid crystal 70 material dual-frequency liquid crystal microlens array, the orientation of the liquid crystal can be controlled by the frequency and size of the electric field to obtain different refractive index distributions. The light beam is defocused or focused by matching or mismatching the different refractive indices of the dual-frequency liquid crystal 70 with the refractive index of the curved polymer array layer, thereby realizing 2D / 3D switchable display, which has a simple structure and good use effect.

[0034] In some embodiments, the distance between the upper substrate polymer layer 30 and the lower substrate alignment layer 40 is 20-30 μm. With this arrangement, a better display effect can be achieved.

[0035] In some embodiments, the upper substrate glass layer 10 , the upper substrate polymer layer 30 , and the lower substrate alignment layer 40 have the same refractive index.

[0036] In some examples, the refractive index of the upper substrate glass layer 10 , the upper substrate polymer layer 30 , and the lower substrate alignment layer 40 may be 1-2, preferably 1.5.

[0037] In some embodiments, the upper substrate electrode layer 20 and / or the lower substrate electrode layer 50 are planar indium tin oxide electrodes. With this configuration, a planar electrode structure is adopted, which has a simple structure and a uniform electric field distribution.

[0038] On the other hand, the embodiment of the present application provides a naked-eye 3D display device based on a dual-frequency liquid crystal microlens array, comprising the dual-frequency liquid crystal microlens array of any one of the above embodiments, and further comprising a 2D display screen 2. The 2D display screen 2 is disposed on one side of the lower substrate glass layer 60 close to the dual-frequency liquid crystal microlens array.

[0039] In some embodiments, the array units formed by the dual-frequency liquid crystal 70 and the array units formed by the upper substrate polymer layer 30 have the same pitch. In the 3D mode, the pitch setting is specifically as follows:

[0040]

[0041] Among them, w is the pitch, m is the number of viewpoints in 3D mode, Q is the pupil distance of the human eye, and W P is the sub-pixel width of 2D display screen 2.

[0042] In some of the embodiments, the 2D display screen 2 and the dual-frequency liquid crystal micro-lens array are arranged in close contact with each other, and the distance between the two is 0.

[0043] In a specific example: the distance between the dual-frequency liquid crystal microlens array and the 2D display screen 2 is 0, and the sub-pixel width W of the 2D display screen 2 is p=30μm, the refractive indexes of the upper substrate glass layer 10, the upper substrate polymer layer 30 and the lower substrate glass layer 60 are matched, and the refractive indexes are all 1.50. The distance d between the upper substrate polymer layer 30 and the lower substrate orientation layer 40 is 25μm, and each dual-frequency liquid crystal microlens array unit and the upper substrate polymer layer 30 array unit have the same pitch.

[0044] By formula The calculated pitch w=90 μm, where m=3 and Q=65 mm.

[0045] Dual frequency LCD 70n e =1.72, n o =1.50, when the frequency of the externally applied AC electric field is 1kHz, the dielectric anisotropy Δε of the dual-frequency liquid crystal 70 is 3.3; when the frequency of the externally applied AC electric field is 50kHz, the dielectric anisotropy Δε of the dual-frequency liquid crystal 70 is -3.0.

[0046] When an electric field E of a certain magnitude and a frequency of 1kHz is applied between the indium tin oxide electrode on the upper substrate plane and the indium tin oxide electrode on the lower substrate plane, the positive dielectric anisotropy causes the liquid crystal molecules to be distributed along the orientation consistent with the direction of the electric field. The refractive index of the incident linearly polarized light in the liquid crystal is n o , matches the refractive index of the upper substrate polymer layer 30, light passes through in a straight line, and the 2D display screen 2 displays a 2D image without parallax. At this time, the device works in 2D mode. Figure 2 shown.

[0047] When an electric field E of a certain magnitude and a frequency of 50kHz is applied between the indium tin oxide electrode on the upper substrate plane and the indium tin oxide electrode on the lower substrate plane, the negative dielectric anisotropy causes the liquid crystal molecules to be distributed along an orientation perpendicular to the electric field direction. The refractive index of the incident linearly polarized light in the liquid crystal is n e , the refractive index of the polymer layer 30 of the upper substrate does not match, the light is refracted, and the 2D display screen 2 displays left and right parallax images. At this time, the device works in 3D mode. Figure 3 shown.

[0048] The above is a detailed introduction to a dual-frequency liquid crystal microlens array and a naked-eye 3D display device provided in the embodiments of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for those skilled in the art, according to the ideas of the present application, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A dual-frequency liquid crystal microlens array, characterized in that: The invention comprises an upper substrate glass layer, an upper substrate electrode layer, an upper substrate polymer layer, a lower substrate alignment layer, a lower substrate electrode layer and a lower substrate glass layer which are arranged in sequence; a dual-frequency liquid crystal is arranged between the upper substrate polymer layer and the lower substrate alignment layer; the dual-frequency liquid crystal forms a plurality of array units, the upper substrate polymer layer forms a plurality of array units, and the array units formed by the dual-frequency liquid crystal and the array units formed by the upper substrate polymer layer have the same pitch.

2. The dual-frequency liquid crystal microlens array according to claim 1, characterized in that: The distance between the upper substrate polymer layer and the lower substrate alignment layer is 20-30 μm.

3. The dual-frequency liquid crystal microlens array according to claim 1, characterized in that: The upper substrate glass layer, the upper substrate polymer layer and the lower substrate glass layer have the same refractive index.

4. The dual-frequency liquid crystal microlens array according to claim 3, characterized in that: The refractive indexes of the upper substrate glass layer, the upper substrate polymer layer and the lower substrate glass layer are 1-2.

5. The dual-frequency liquid crystal microlens array according to claim 1, characterized in that: The upper substrate electrode layer and / or the lower substrate electrode layer adopts a planar indium tin oxide electrode.

6. A naked-eye 3D display device based on a dual-frequency liquid crystal microlens array, comprising the dual-frequency liquid crystal microlens array according to any one of claims 1 to 5, characterized in that: It also includes a 2D display screen, which is arranged on a side close to the lower substrate glass layer.

7. The naked-eye 3D display device based on a dual-frequency liquid crystal microlens array according to claim 6, characterized in that: The array units formed by the dual-frequency liquid crystal and the array units formed by the upper substrate polymer layer have the same pitch: Among them, w is the pitch, m is the number of viewpoints in 3D mode, Q is the pupil distance of the human eye, and W P is the sub-pixel width of the 2D display.

8. The naked-eye 3D display device based on a dual-frequency liquid crystal microlens array according to claim 6, characterized in that: The 2D display screen and the dual-frequency liquid crystal microlens array are arranged in close contact with each other, and the distance between the two is 0.

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