Micro LED display device

Abstract

A Micro LED display device comprises a Micro LED light-emitting layer, a polarization layer and a refraction layer, and the Micro LED light-emitting layer comprises a plurality of Micro LEDs; the refraction layer is located on the light-emitting side of the Micro LED light-emitting layer and comprises a plurality of micro lens units. The polarization layer is located between the Micro LED light-emitting layer and the refraction layer; according to the Micro LED display device, the polarization layer can convert light emitted by the Micro LED light-emitting layer into polarized light, and the micro lens units have a refraction effect on the light, so that the light emitted by each Micro LED can only selectively enter the left eye or the right eye of an observer, and the Micro LED display device can present a 3D display effect. According to the Micro LED display device, the high-quality display effect of the Micro LED display technology is kept, the naked eye 3D display function can be achieved, and the structure is simple.

Description

Technical Field

[0001] The utility model relates to the field of display technology, and in particular to a Micro LED display device. Background Art

[0002] Micro LED (micrometer light-emitting diode) display technology refers to a display technology that uses self-luminous micrometer-scale LEDs as light-emitting pixel units and assembles them on a driving panel to form a high-density LED array. Due to the characteristics of small size, high integration and self-luminescence, Micro LED has greater advantages in brightness, resolution, contrast, energy consumption, service life, response speed and thermal stability compared with LCD (Liquid Crystal Display) and OLED (Organic Light-Emitting Diode) in terms of display.

[0003] 3D (three-dimensional) display technology is a new type of display technology. Compared with ordinary 2D (two-dimensional) display technology, 3D display technology can make the picture three-dimensional and realistic. The image is no longer limited to the plane of the screen, but seems to be able to walk out of the screen, giving the audience an immersive feeling.

[0004] Currently, the parallax barrier type naked eye 3D display technology is not mature. If you want to achieve the function of free switching between 2D display and 3D display, you need to add a liquid crystal lens to the display panel to achieve the 3D display effect by using the birefringence of the liquid crystal lens. This places particularly high requirements on the liquid crystal and its rotation angle, and requires a complex driving circuit.

[0005] In view of this, it is necessary to design a Micro LED display device that has both high-quality display effects and can achieve naked-eye 3D display effects. Utility Model Content

[0006] The purpose of the utility model is to provide a Micro LED display device, aiming to solve the shortcomings of the above-mentioned background technology, which not only maintains the high-quality display effect of Micro LED display technology, but also can realize the naked-eye 3D display function and has a simple structure.

[0007] The utility model provides a Micro LED display device, comprising a Micro LED light-emitting layer, a polarization layer and a refraction layer, wherein the Micro LED light-emitting layer comprises a plurality of Micro LEDs; the refraction layer is located at the light-emitting side of the Micro LED light-emitting layer, and the refraction layer comprises a plurality of micro lens units; the polarization layer is located between the Micro LED light-emitting layer and the refraction layer; the polarization layer can convert the light emitted by the Micro LED light-emitting layer into polarized light, and the micro lens unit refracts the light, so that the light emitted by each Micro LED can only selectively enter the left eye or the right eye of the observer, thereby making the Micro LED display device present a 3D display effect.

[0008] Furthermore, the polarization layer is a metal wire grid polarizer.

[0009] Furthermore, the polarization layer has a polarization state and a non-polarization state, and the polarization layer can switch between the polarization state and the non-polarization state; when the polarization layer is in the polarization state, the polarization layer can convert the light emitted by the MicroLED light-emitting layer into polarized light, so that the Micro LED display device presents a 3D display effect; when the polarization layer is in the non-polarization state, the polarization layer does not perform polarization filtering on the light emitted by the Micro LED light-emitting layer, so that the Micro LED display device presents a 2D display effect.

[0010] Furthermore, the polarizing layer is a polymer quantum rod film.

[0011] Furthermore, the Micro LED display device includes a plurality of pixel units arranged in an array along a first direction and a second direction, wherein the first direction is perpendicular to the second direction; the plurality of Micro LEDs include a plurality of red LEDs, a plurality of green LEDs and a plurality of blue LEDs, and each of the pixel units includes one red LED, one green LED and one blue LED.

[0012] Furthermore, the Micro LED display device includes a plurality of pixel units arranged in an array along a first direction and a second direction, wherein the first direction is perpendicular to the second direction;

[0013] The microlens unit is a long strip structure, the microlens unit is extended along the first direction, and a plurality of the microlens units are arranged along the second direction; a plurality of the pixel units are arranged into a plurality of columns along the second direction, and each of the microlens units corresponds to a column of the pixel units;

[0014] Alternatively, the plurality of microlens units correspond one-to-one to the plurality of pixel units respectively.

[0015] Furthermore, a surface of the microlens unit away from the Micro LED light-emitting layer is a curved structure; or a surface of the microlens unit close to the Micro LED light-emitting layer is a curved structure.

[0016] Furthermore, the microlens unit is a solidified liquid crystal structure, a plurality of liquid crystal molecules are arranged in the solidified liquid crystal structure, the arrangement directions of the liquid crystal molecules are the same, and the liquid crystal molecules are fixed in the solidified liquid crystal structure.

[0017] Furthermore, the refractive layer also includes a first transparent substrate and a second transparent substrate arranged opposite to each other and a structural layer arranged between the first transparent substrate and the second transparent substrate, the microlens unit is arranged between the first transparent substrate and the second transparent substrate, the microlens unit and the structural layer are arranged adjacent to each other up and down, and the refractive index of the microlens unit is not equal to the refractive index of the structural layer.

[0018] Furthermore, a groove is provided on the structural layer, and the microlens unit is arranged in the groove; the inner wall of the groove is a curved surface structure, and the surface of the microlens unit at the contact position with the inner wall of the groove is a curved surface structure.

[0019] The Micro LED display device provided by the utility model sequentially arranges a polarization layer and a refraction layer on the light-emitting side of the Micro LED light-emitting layer, the refraction layer includes a plurality of micro lens units, the polarization layer can convert the light emitted by the Micro LED light-emitting layer into polarized light, and the micro lens unit can refract the light. Through the cooperation of the polarization layer and the refraction layer, the light emitted by each Micro LED can only selectively enter the left eye or the right eye of the observer, so that the left eye and the right eye of the observer can respectively present two images with parallax, and the parallax images of the left and right eyes can produce a three-dimensional feeling in the brain, so that the Micro LED display device presents a naked-eye 3D display effect. The Micro LED display device not only maintains the high-quality display effect of the Micro LED display technology, but also can realize the display function of naked-eye 3D, and has a simple structure, and is easy to manufacture and drive. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of a cross-section of a Micro LED display device in the first embodiment of the present invention.

[0021] Figure 2a This is a schematic diagram of the Micro LED display device in the first embodiment of the utility model presenting a 2D display effect.

[0022] Figure 2bThis is a schematic diagram of the Micro LED display device in the first embodiment of the utility model presenting a 3D display effect.

[0023] Figure 3 It is a schematic diagram of the planar structure of a plurality of microlens units in the first embodiment of the utility model.

[0024] Figure 4 It is a schematic diagram of the three-dimensional structure of a single microlens unit in the first embodiment of the utility model.

[0025] Figure 5 It is a schematic cross-sectional view of a polymer quantum rod film in the first embodiment of the utility model.

[0026] Figures 6a to 6d It is a schematic diagram of the manufacturing process of the refractive layer in the first embodiment of the utility model.

[0027] Figure 7 Schematic diagram of a cross-section of a Micro LED display device in a second embodiment of the present invention.

[0028] Figure 8 Schematic diagram of a cross-section of a Micro LED display device in a third embodiment of the present invention.

[0029] Fig. 9 It is a schematic diagram of the planar structure of a plurality of micro-lens units in the fourth embodiment of the utility model.

[0030] Fig.10 It is a schematic diagram of the three-dimensional structure of a single microlens unit in the fourth embodiment of the utility model. DETAILED DESCRIPTION

[0031] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0032] The terms "first", "second", "third", "fourth" and the like (if any) in the description and claims of the present invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0033] The directional words such as up, down, left, right, front, back, top, bottom, etc. (if any) involved in the specification and claims of the utility model are defined by the positions of the structures in the drawings and the positions of the structures relative to each other, and are only for the clarity and convenience of expressing the technical solution. It should be understood that the use of directional words should not limit the scope of protection requested by this application.

[0034] First embodiment

[0035] like Figures 1 to 4As shown, the Micro LED display device provided by the first embodiment of the utility model includes a Micro LED light emitting layer 1, a polarization layer 2 and a refraction layer 3. The Micro LED light emitting layer 1 includes a plurality of Micro LEDs arranged in an array. The refraction layer 3 is located on the light emitting side of the Micro LED light emitting layer 1, and the refraction layer 3 includes a plurality of micro lens units 31; the polarization layer 2 is located between the Micro LED light emitting layer 1 and the refraction layer 3.

[0036] The polarization layer 2 can perform polarization filtering on the light, and convert the light emitted by the Micro LED light-emitting layer 1 into polarized light (the light emitted by the Micro LED light-emitting layer 1 is non-polarized light, and the polarization layer 2 can perform polarization filtering on the non-polarized light emitted by the Micro LED light-emitting layer 1, and convert it into polarized light); the microlens unit 31 is used to refract the light, so that the light emitted by each Micro LED can only selectively enter the left eye or the right eye of the observer (that is, the light emitted by each Micro LED can only enter one of the left eye and the right eye, and will not enter both the left eye and the right eye at the same time), so that the Micro LED display device presents a 3D display effect.

[0037] Specifically, Figure 2a As shown, since the light emitted by the Micro LED light-emitting layer 1 is non-polarized light (the light emitted by the Micro LED light-emitting layer 1 is similar to natural light, which contains all possible vibration directions perpendicular to the propagation direction of the light wave, so it does not show polarization), if the light emitted by the Micro LED light-emitting layer 1 is not polarized and filtered, the light emitted by each Micro LED is in a divergent state (the light can propagate in all directions). After refraction by the refractive layer 3, the light emitted by each Micro LED can reach the left and right eyes of the observer at the same time, and no parallax can be formed, that is, the left and right eyes of the observer can see the same image. At this time, the Micro LED display device will present a 2D display effect. Figure 2b As shown, the light emitted by the MicroLED light-emitting layer 1 is converted into polarized light after being polarized and filtered by the polarization layer 2 (that is, after passing through the polarization layer 2, the light can only propagate in one direction). After the polarized light is refracted by the refractive layer 3, it can only propagate in a fixed direction, so it can only selectively enter the observer's left eye or right eye (it cannot enter the left eye and the right eye at the same time), so that the observer's left eye and right eye can respectively present two images with parallax. The parallax images of the left and right eyes can produce a three-dimensional feeling in the brain, realizing the naked-eye 3D display effect.

[0038] The Micro LED display device provided by the utility model is provided with a polarization layer 2 and a refraction layer 3 on the light-emitting side of the Micro LED light-emitting layer 1 in sequence, the refraction layer 3 includes a plurality of micro lens units 31, the polarization layer 2 can convert the light emitted by the Micro LED light-emitting layer 1 into polarized light, and the micro lens unit 31 can refract the light. Through the cooperation of the polarization layer 2 and the refraction layer 3, the light emitted by each Micro LED can only selectively enter the left eye or the right eye of the observer, so that the left eye and the right eye of the observer can respectively present two images with parallax, and the parallax images of the left and right eyes can produce a three-dimensional feeling in the brain, so that the Micro LED display device presents a naked-eye 3D display effect. The Micro LED display device not only maintains the high-quality display effect of the Micro LED display technology, but also can realize the naked-eye 3D display function, and has a simple structure, and is easy to manufacture and drive.

[0039] Furthermore, if Figure 1 to Figure 2b As shown, in this embodiment, the polarization layer 2 has a polarization state and a non-polarization state, and the polarization layer 2 can switch between the polarization state and the non-polarization state. Figure 2b As shown, when the polarization layer 2 is in a polarized state, the polarization layer 2 can convert the light emitted by the Micro LED light-emitting layer 1 into polarized light, so that the Micro LED display device presents a 3D display effect; Figure 2a As shown, when the polarization layer 2 is in a non-polarized state, the polarization layer 2 does not perform polarization filtering on the light emitted by the Micro LED light-emitting layer 1 (i.e., the polarization layer 2 does not change the polarization characteristics of the light emitted by the Micro LED light-emitting layer 1), so that the Micro LED display device presents a 2D display effect. By switching the polarization layer 2 between the polarized state and the non-polarized state, the Micro LED display device can switch between 3D display and 2D display.

[0040] Specifically, Figure 1 and Figure 5As shown, in this embodiment, the polarizing layer 2 is a polymer quantum rod film 22, which includes an upper transparent substrate 221 and a lower transparent substrate 222 arranged opposite to each other, and a quantum rod solution layer 225 located between the upper transparent substrate 221 and the lower transparent substrate 222, and the quantum rod solution layer 225 includes a polymer and a plurality of quantum rods 2251 dispersed in the polymer. The quantum rod 2251 is composed of one or more semiconductor materials such as CdSe, CdTe, CdS, and ZnSe, and the polymer is a mixture of organic solvents and additives such as stabilizers, and the organic solvent is a solvent that does not react with the quantum rod 2251, such as diethylene glycol methyl ethyl ether, methyl ethyl ketone, and methyl isobutyl ketone. The surface of the quantum rod 2251 is modified by chelation, grafting, ligand exchange, etc., so that the surface of the quantum rod 2251 has metal ion groups, polar groups, or other electric field-induced groups, and the quantum rod 2251 can be oriented and orderly arranged under the action of the electric field, thereby realizing the polarization function.

[0041] The polymer quantum rod film 22 also includes a first electrode layer 223 and a second electrode layer 224. The first electrode layer 223 and the second electrode layer 224 can be arranged on the same substrate (i.e., a horizontal electric field is generated between the two), or arranged on different substrates (i.e., a vertical electric field is generated between the two). In this embodiment, the first electrode layer 223 and the second electrode layer 224 are both arranged on the lower transparent substrate 222. The first electrode layer 223 includes a plurality of electrode strips 2231 arranged at intervals. The second electrode layer 224 is a planar structure. The first electrode layer 223 and the second electrode layer 224 are separated by an insulating layer 226. Figure 2a and Figure 5 As shown, when no voltage is applied between the first electrode layer 223 and the second electrode layer 224, the plurality of quantum rods 2251 in the polymer quantum rod film 22 are arranged in a disordered manner. At this time, the polymer quantum rod film 22 is in a non-polarized state, and the Micro LED display device presents a 2D display effect. Figure 2b and Figure 5 As shown, when a corresponding voltage is applied between the first electrode layer 223 and the second electrode layer 224, the multiple quantum rods 2251 in the polymer quantum rod film 22 are oriented and arranged under the action of the electric field. At this time, the polymer quantum rod film 22 is in a polarized state, and the Micro LED display device presents a 3D display effect (the specific structure and working principle of the polymer quantum rod film 22 can refer to the prior art). Of course, in other embodiments, the polarization layer 2 can also be other polarization structures that can switch between a polarized state and a non-polarized state.

[0042] Furthermore, if Figure 1 and Figure 2bAs shown, in this embodiment, the polarization layer 2 can convert the light emitted by the Micro LED light-emitting layer 1 into polarized light whose polarization direction is parallel to the plane where the refractive layer 3 is located, that is, the polarization direction of the polarization layer 2 is parallel to the plane where the refractive layer 3 is located; the propagation direction of the polarized light is perpendicular to the plane where the refractive layer 3 is located. Of course, in other embodiments, the polarization direction of the polarization layer 2 can also be other directions.

[0043] Furthermore, if Figure 1 and Figure 3 As shown, in this embodiment, the Micro LED display device includes a plurality of pixel units P ( Figure 3 , each dotted box represents a pixel unit P), and the first direction Y is perpendicular to the second direction X. The multiple Micro LEDs include multiple red LEDs 11, multiple green LEDs 12, and multiple blue LEDs 13, and each pixel unit P is provided with a red LED 11, a green LED 12, and a blue LED 13. The self-luminescence of the red LED 11 is red, the self-luminescence of the green LED 12 is green, and the self-luminescence of the blue LED 13 is blue, thereby realizing full-color display of the Micro LED display device.

[0044] Furthermore, if Figure 1 , Figure 3 and Figure 4 As shown, in this embodiment, the microlens unit 31 is a long strip structure (specifically a rod-shaped structure), and each microlens unit 31 corresponds to a plurality of pixel units P. Specifically, in this embodiment, each microlens unit 31 is extended along the first direction Y, and a plurality of microlens units 31 are arranged along the second direction X; a plurality of pixel units P are arranged into a plurality of columns along the second direction X (i.e., a plurality of pixel units P in the same first direction Y is a column), and each microlens unit 31 corresponds to a column of pixel units P.

[0045] Furthermore, if Figure 1 and Figure 3 As shown, in this embodiment, the first direction Y is the up-down direction, and the second direction X is the left-right direction. Of course, in other embodiments, the first direction Y may also be the left-right direction, and the second direction X may be the up-down direction.

[0046] Furthermore, if Figure 1 and Figure 3 As shown, in this embodiment, one of the first direction Y and the second direction X is the length direction of the Micro LED display device, and the other is the width direction of the Micro LED display device.

[0047] Furthermore, if Figure 1As shown, in this embodiment, the Micro LED display device further includes a base substrate 4 and a control electrode layer 5, the base substrate 4 is located on the side of the Micro LED light-emitting layer 1 away from the polarization layer 2, the control electrode layer 5 is located between the base substrate 4 and the Micro LED light-emitting layer 1, and the control electrode layer 5 and the Micro LED light-emitting layer 1 are both arranged on the base substrate 4. The control electrode layer 5 is electrically connected to the Micro LED light-emitting layer 1, and is used to control the switch and brightness of the Micro LED light-emitting layer 1.

[0048] Furthermore, the polarizing layer 2 may be disposed on the lower surface of the refractive layer 3 , or on the upper surface of the Micro LED light-emitting layer 1 .

[0049] Furthermore, if Figure 1 As shown, in this embodiment, the surface of the microlens unit 31 away from the Micro LED light-emitting layer 1 is a curved surface structure (that is, the microlens unit 31 is a structure that convexly projects upward, and its cross section may be a semicircular structure), and light can be refracted on the curved surface. By setting the surface of the microlens unit 31 to a curved surface structure, a pre-tilt angle is provided when the light is refracted, so as to improve the refraction effect, thereby improving the 3D display effect.

[0050] Furthermore, if Figure 1 As shown, in this embodiment, the microlens unit 31 is a solidified liquid crystal structure (i.e., the microlens unit 31 is solidified by liquid crystal), and a plurality of liquid crystal molecules 311 are arranged in the solidified liquid crystal structure, and the arrangement direction of each liquid crystal molecule 311 is the same (i.e., the long axes of each liquid crystal molecule 311 are parallel to each other), and the liquid crystal molecules 311 are fixed in the solidified liquid crystal structure (i.e., the liquid crystal molecules 311 cannot rotate in the solidified liquid crystal structure). By aligning the plurality of liquid crystal molecules 311 and utilizing the refractive property of the liquid crystal molecules 311 to light, the refractive function of the microlens unit 31 is realized. Of course, in other embodiments, the microlens unit 31 may also be other microlens structures.

[0051] Furthermore, if Figure 1As shown, in this embodiment, the refractive layer 3 further includes a first transparent substrate 32 and a second transparent substrate 33 that are arranged opposite to each other and a structural layer 34 that is arranged between the first transparent substrate 32 and the second transparent substrate 33, the microlens unit 31 is arranged between the first transparent substrate 32 and the second transparent substrate 33, the microlens unit 31 and the structural layer 34 are arranged adjacent to each other up and down, and the refractive index of the microlens unit 31 is not equal to the refractive index of the structural layer 34 (the refractive index of the microlens unit 31 can be greater than the refractive index of the structural layer 34, or it can be less than the refractive index of the structural layer 34). Since the refractive index of the microlens unit 31 is not equal to the refractive index of the structural layer 34, the light will be refracted when passing through the interface between the microlens unit 31 and the structural layer 34. At the same time, by controlling the relative size relationship between the refractive index of the microlens unit 31 and the refractive index of the structural layer 34, the refractive effect of the refractive layer 3 on the light (i.e., whether the light is divergent or convergent, and the angle of refraction) is controlled.

[0052] Specifically, in this embodiment, the liquid crystal molecules 311 have a birefringence index, and the liquid crystal molecules 311 have a short-axis refractive index n o and the major axis refractive index n e , the structural layer 34 is located on the side of the microlens unit 31 away from the Micro LED light-emitting layer 1 (i.e., the light enters the microlens unit 31 and the structural layer 34 in turn); the arrangement direction of the liquid crystal molecules 311 is parallel to the plane where the refractive layer 3 is located (i.e., the long axis of the liquid crystal molecules 311 is parallel to the plane where the refractive layer 3 is located), and the refractive index n1 of the structural layer 34 is greater than the long axis refractive index n e When the light is incident perpendicular to the long axis of the liquid crystal molecule 311, since the refractive index n1 of the structure layer 34 is greater than the long axis refractive index n e , so the refractive layer 3 can have a focusing effect on the light. Of course, in other embodiments, the arrangement direction of the liquid crystal molecules 311 can also be other directions (for example

[0053] The arrangement direction of the liquid crystal molecules 311 is perpendicular to the plane where the refractive layer 3 is located, that is, the short axis of the liquid crystal molecules 311 is parallel to the plane where the refractive layer 3 is located. In other embodiments, the refractive index n1 of the structural layer 34 may also be smaller than the long axis refractive index n2 of the liquid crystal molecules 311. e At this time, the refractive layer 3 can have a diverging effect on the light.

[0054] Furthermore, if Figure 1As shown, in this embodiment, a groove 341 is provided on the structural layer 34, and the microlens unit 31 is arranged in the groove 341; the inner wall of the groove 341 is a curved surface structure, and the microlens unit 31 is arranged in a contour with the groove 341, and the surface of the microlens unit 31 at the position where the inner wall of the groove 341 contacts the microlens unit 31 is a curved surface structure. That is, the structural layer 34 can not only cooperate with the microlens unit 31 to realize the refraction function, but also can be used for the structural shaping of the microlens unit 31 (so that the surface of the microlens unit 31 forms a curved surface structure).

[0055] Furthermore, in this embodiment, the structural layer 34 is made of an organic resin material similar to OC.

[0056] like Figures 6a to 6d As shown, the method for manufacturing the refractive layer 3 in this embodiment includes the following steps:

[0057] (1) Figure 6a As shown, an organic resin layer 340 is formed on the first transparent substrate 32;

[0058] (2) Figure 6b As shown, the organic resin layer 340 is etched (specifically, it may include steps such as exposure and development) to form a plurality of grooves 341 on the organic resin layer 340, that is, a structural layer 34 is formed on the first transparent substrate 32;

[0059] (3) Figure 6c As shown, liquid crystal is dripped onto the second transparent substrate 33, thereby forming a liquid crystal layer 310 on the second transparent substrate 33;

[0060] (4) Figure 6d As shown, the first transparent substrate 32 in step (2) and the second transparent substrate 33 in step (3) are assembled into a box, and then the liquid crystal layer 310 is oriented and fixed to form a plurality of microlens units 31, that is, the refractive layer 3 is obtained; wherein, the liquid crystal molecules 311 can be oriented by applying an electric field, and the liquid crystal can be cured by ultraviolet light irradiation (for details, please refer to patents such as CN109239982B).

[0061] The Micro LED display device provided by the embodiment of the utility model is provided with a polarization layer 2 and a refraction layer 3 on the light-emitting side of the Micro LED light-emitting layer 1 in sequence, and the refraction layer 3 includes a plurality of micro lens units 31. The polarization layer 2 can convert the light emitted by the Micro LED light-emitting layer 1 into polarized light, and the micro lens unit 31 can refract the light. Through the cooperation of the polarization layer 2 and the refraction layer 3, the light emitted by each Micro LED can only selectively enter the left eye or the right eye of the observer, so that the left eye and the right eye of the observer can respectively present two images with parallax, and the parallax images of the left and right eyes can produce a three-dimensional feeling in the brain, so that the Micro LED display device presents a naked-eye 3D display effect. The Micro LED display device not only maintains the high-quality display effect of the Micro LED display technology, but also can realize the naked-eye 3D display function, and has a simple structure and is easy to manufacture and drive. At the same time, the polarization layer 2 can switch between the polarization state and the non-polarization state, so that the Micro LED display device can switch between 3D display and 2D display.

[0062] Second embodiment

[0063] like Figure 7 As shown, the Micro LED display device provided in the second embodiment of the present invention is basically the same as the first embodiment, except that the structure of the polarization layer 2 is different.

[0064] Specifically, in this embodiment, the polarization layer 2 is a metal wire grid polarizer 21, which can be formed into a regular linear grating on a substrate by nanoimprinting technology. The specific structure of the metal wire grid polarizer 21 can refer to the prior art and will not be repeated here.

[0065] Since the metal wire grid polarizer 21 only has a polarization filtering effect on light (i.e., it is equivalent to a polarizer) and cannot be switched to a non-polarized state, the Micro LED display device in this embodiment can only realize the naked eye 3D display function and cannot be switched to 2D display.

[0066] The other structures and functions of this embodiment are the same or similar to those of the first embodiment and are not described in detail here.

[0067] Third embodiment

[0068] like Figure 8 As shown, the Micro LED display device provided in the third embodiment of the present invention is basically the same as the first embodiment, except that the structure of the refractive layer 3 is different.

[0069] Specifically, in this embodiment, the surface of the microlens unit 31 close to the Micro LED light-emitting layer 1 is a curved surface structure (i.e., the microlens unit 31 is a downwardly convex structure), and the structural layer 34 is located on the side of the microlens unit 31 close to the Micro LED light-emitting layer 1 (i.e., the light enters the structural layer 34 and the microlens unit 31 in sequence). By controlling the relative magnitude relationship between the refractive index of the microlens unit 31 and the refractive index of the structural layer 34, the refraction effect of the refractive layer 3 on the light is controlled.

[0070] The other structures and functions of this embodiment are the same or similar to those of the first embodiment and are not described in detail here.

[0071] Fourth embodiment

[0072] like Fig. 9 and Fig.10 As shown, the Micro LED display device provided in the fourth embodiment of the present invention is basically the same as the first embodiment, except that the structure and arrangement of the micro lens unit 31 are different.

[0073] Specifically, in the present embodiment, the Micro LED display device includes a plurality of pixel units P arranged in an array along a first direction Y and a second direction X, wherein the first direction Y is perpendicular to the second direction X; a plurality of microlens units 31 correspond one-to-one to the plurality of pixel units P, that is, the plurality of microlens units 31 are also arranged in an array along the first direction Y and the second direction X, and each microlens unit 31 is located in a corresponding pixel unit P.

[0074] Furthermore, if Fig.10 As shown, in this embodiment, the microlens unit 31 is a hemispherical structure.

[0075] The other structures and functions of this embodiment are the same or similar to those of the first embodiment and are not described in detail here.

[0076] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A Micro LED display device, characterized in that: The device comprises a Micro LED light-emitting layer (1), a polarizing layer (2) and a refractive layer (3), wherein the Micro LED light-emitting layer (1) comprises a plurality of Micro LEDs; the refractive layer (3) is located on the light-emitting side of the Micro LED light-emitting layer (1), and the refractive layer (3) comprises a plurality of micro lens units (31); the polarizing layer (2) is located between the Micro LED light-emitting layer (1) and the refractive layer (3); the polarizing layer (2) is capable of converting the light emitted by the Micro LED light-emitting layer (1) into polarized light, and the micro lens unit (31) refracts the light, so that the light emitted by each Micro LED can only selectively enter the left eye or the right eye of the observer, thereby enabling the Micro LED display device to present a 3D display effect.

2. The Micro LED display device according to claim 1, wherein: The polarizing layer (2) is a metal wire grid polarizer (21).

3. The Micro LED display device according to claim 1, wherein: The polarization layer (2) has a polarization state and a non-polarization state, and the polarization layer (2) can switch between the polarization state and the non-polarization state; when the polarization layer (2) is in the polarization state, the polarization layer (2) can convert the light emitted by the Micro LED light-emitting layer (1) into polarized light, so that the Micro LED display device presents a 3D display effect; when the polarization layer (2) is in the non-polarization state, the polarization layer (2) does not perform polarization filtering on the light emitted by the Micro LED light-emitting layer (1), so that the Micro LED display device presents a 2D display effect.

4. The Micro LED display device according to claim 3, wherein: The polarizing layer (2) is a polymer quantum rod film (22).

5. The Micro LED display device according to claim 1, wherein: The Micro LED display device comprises a plurality of pixel units (P) arranged in an array along a first direction (Y) and a second direction (X), wherein the first direction (Y) is perpendicular to the second direction (X); the plurality of Micro LEDs comprises a plurality of red LEDs (11), a plurality of green LEDs (12) and a plurality of blue LEDs (13), and each of the pixel units (P) comprises one of the red LEDs (11), one of the green LEDs (12) and one of the blue LEDs (13).

6. The Micro LED display device according to claim 1, wherein: The Micro LED display device includes a plurality of pixel units (P) arranged in an array along a first direction (Y) and a second direction (X), wherein the first direction (Y) is perpendicular to the second direction (X); The microlens unit (31) is a long strip structure, the microlens unit (31) is extended along the first direction (Y), and a plurality of the microlens units (31) are arranged along the second direction (X); a plurality of the pixel units (P) are arranged in a plurality of columns along the second direction (X), and each of the microlens units (31) corresponds to a column of the pixel units (P); Alternatively, the plurality of microlens units (31) correspond one-to-one to the plurality of pixel units (P).

7. The Micro LED display device according to claim 1, wherein: The surface of the microlens unit (31) on a side away from the Micro LED light-emitting layer (1) is a curved surface structure; or the surface of the microlens unit (31) on a side close to the Micro LED light-emitting layer (1) is a curved surface structure.

8. The Micro LED display device according to claim 1, wherein: The microlens unit (31) is a solidified liquid crystal structure, a plurality of liquid crystal molecules (311) are arranged in the solidified liquid crystal structure, the arrangement directions of the liquid crystal molecules (311) are the same, and the liquid crystal molecules (311) are fixed in the solidified liquid crystal structure.

9. The Micro LED display device according to any one of claims 1 to 8, wherein: The refractive layer (3) further comprises a first transparent substrate (32) and a second transparent substrate (33) which are arranged opposite to each other, and a structural layer (34) which is arranged between the first transparent substrate (32) and the second transparent substrate (33); the microlens unit (31) is arranged between the first transparent substrate (32) and the second transparent substrate (33); the microlens unit (31) and the structural layer (34) are arranged adjacent to each other in a vertical direction; and the refractive index of the microlens unit (31) is not equal to the refractive index of the structural layer (34).

10. The Micro LED display device according to claim 9, wherein: A groove (341) is provided on the structural layer (34), and the microlens unit (31) is arranged in the groove (341); the inner wall of the groove (341) is a curved surface structure, and the surface of the microlens unit (31) at the position where it contacts the inner wall of the groove (341) is also a curved surface structure.

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