Micro LED display device

Abstract

A Micro LED display device comprises a Micro LED light-emitting layer, an electric control visual angle adjusting layer and a grating structure layer, the electric control visual angle adjusting layer is located on the light-emitting side of the Micro LED light-emitting layer, and the grating structure layer is located between the Micro LED light-emitting layer and the electric control visual angle adjusting layer or in the electric control visual angle adjusting layer; the grating structure layer comprises a plurality of grating strips of a long-strip-shaped structure, each grating strip comprises a grating block and a light shielding layer arranged on the grating block, the light shielding layer comprises a metal layer and a molybdenum oxide layer which are arranged in a stacked mode, light shielding areas are formed in the positions, corresponding to the grating strips, of the grating structure layer, and light transmitting areas are formed between the adjacent grating strips of the grating structure layer. According to the Micro LED display device, the high-quality display effect of the Micro LED display technology is kept, and wide and narrow visual angles can be switched, so that the peep-proof purpose is achieved.

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 uses self-luminous micron-sized LEDs as pixel units, assembled onto a driver panel to form a high-density LED array. Due to its small size, high integration, and self-luminescence, Micro LEDs offer significant advantages over LCDs (Liquid Crystal Displays) and OLEDs (Organic Light-Emitting Diodes) in terms of brightness, resolution, contrast, energy consumption, lifespan, response speed, and thermal stability.

[0003] With the advancement of the times, users not only have higher demands for the display effects of Micro LED display devices, but also have increasingly strong requirements for personal privacy protection. However, the existing Micro LED display technology cannot meet user needs. Therefore, it is necessary to design a Micro LED display device that not only has high-quality display effects but also can switch between wide and narrow viewing angles to achieve the purpose of anti-peeping. Utility Model Content

[0004] The purpose of the present utility model is to provide a Micro LED display device, which aims to solve the shortcomings of the above-mentioned background technology, maintain the high-quality display effect of Micro LED display technology, and realize wide and narrow viewing angle switching to achieve the purpose of anti-peeping.

[0005] The utility model provides a Micro LED display device, comprising a Micro LED light-emitting layer, an electrically controlled viewing angle adjustment layer for switching between wide and narrow viewing angles, and a grating structure layer for collecting light. The electrically controlled viewing angle adjustment layer is located on the light-emitting side of the Micro LED light-emitting layer, and the grating structure layer is located between the Micro LED light-emitting layer and the electrically controlled viewing angle adjustment layer or within the electrically controlled viewing angle adjustment layer.

[0006] The grating structure layer includes a plurality of grating strips in an elongated structure, each of the grating strips extending along a first direction, and the plurality of the grating strips arranged at intervals along a second direction, wherein the first direction is perpendicular to the second direction; each of the grating strips includes a grid block and a light shielding layer provided on the grid block, the light shielding layer including a stacked metal layer and a molybdenum oxide layer; the grating structure layer forms a light shielding area at a position corresponding to the grating strip, and the grating structure layer forms a light-transmitting area between adjacent grating strips;

[0007] The electrically controlled viewing angle adjustment layer has a first state and a second state. When the electrically controlled viewing angle adjustment layer is in the first state, the electrically controlled viewing angle adjustment layer can increase the emission angle of light, and the Micro LED display device is in a wide viewing angle mode. When the electrically controlled viewing angle adjustment layer is in the second state, the electrically controlled viewing angle adjustment layer does not change the emission angle of light, and the Micro LED display device is in a narrow viewing angle mode.

[0008] Furthermore, the electrically controlled viewing angle adjustment layer is a PDLC electrically controlled haze liquid crystal film layer, a PNLC electrically controlled haze liquid crystal film layer or a PSCT electrically controlled haze liquid crystal film layer.

[0009] Furthermore, the electrically controlled viewing angle adjustment layer is a viewing angle control liquid crystal cell, comprising a first substrate, a second substrate disposed on a side of the first substrate away from the Micro LED light-emitting layer, a refractive layer, and a liquid crystal layer located between the first and second substrates; the liquid crystal layer comprises a plurality of liquid crystal molecules, each having a birefringence index, wherein the two refractive indices of the liquid crystal molecules are a first refractive index and a second refractive index, respectively, and the first refractive index is greater than the second refractive index;

[0010] The refractive layer is provided on a side of the first substrate close to the liquid crystal layer, and the refractive index of the refractive layer is equal to the first refractive index of the liquid crystal molecules;

[0011] Alternatively, the refractive layer is provided on a side of the second substrate close to the liquid crystal layer, and the refractive index of the refractive layer is equal to the second refractive index of the liquid crystal layer.

[0012] Furthermore, the light shielding layer includes a molybdenum oxide layer and a metal layer, and the molybdenum oxide layer is located on a side of the metal layer close to the Micro LED light-emitting layer;

[0013] Alternatively, the light shielding layer includes a molybdenum oxide layer and a metal layer, and the molybdenum oxide layer is located on a side of the metal layer away from the Micro LED light-emitting layer;

[0014] Alternatively, the light shielding layer includes two molybdenum oxide layers and one metal layer, and the metal layer is sandwiched between the two molybdenum oxide layers.

[0015] Furthermore, in the direction from the Micro LED light-emitting layer toward the electrically controlled viewing angle adjustment layer, the cross-section of the grid blocks is a structure with gradually increasing width, and the cross-section of the grating strips is a structure with gradually increasing width.

[0016] Furthermore, the cross section of the grid block is an inverted trapezoidal structure, the light shielding layer is arranged on the bottom wall and the side wall of the grid block, and the cross section of the grating strip is an inverted trapezoidal structure.

[0017] Furthermore, the height of the grating strips is 50 micrometers to 100 micrometers, and the spacing between adjacent grating strips is 40 micrometers to 50 micrometers.

[0018] Furthermore, the thickness of the metal layer is 200 nanometers to 300 nanometers, and the thickness of the molybdenum oxide layer is 30 nanometers to 100 nanometers.

[0019] Furthermore, the grating structure layer further includes a flat layer, and the grating strips are arranged in the flat layer.

[0020] Furthermore, the grating structure layer is located between the Micro LED light-emitting layer and the electrically controlled viewing angle adjustment layer. The Micro LED display device further includes a first base substrate, the first base substrate is located between the Micro LED light-emitting layer and the electrically controlled viewing angle adjustment layer, and the grating structure layer is provided on the first base substrate.

[0021] Alternatively, the grating structure layer is located between the Micro LED light-emitting layer and the electrically controlled viewing angle adjustment layer, and the grating structure layer is arranged on a side of the electrically controlled viewing angle adjustment layer close to the Micro LED light-emitting layer;

[0022] Alternatively, the grating structure layer is located within the electrically controlled viewing angle adjustment layer, which includes a first substrate, a second substrate arranged on a side of the first substrate away from the Micro LED light-emitting layer, and a liquid crystal layer located between the first substrate and the second substrate, and the grating structure layer is arranged on a side of the first substrate close to the liquid crystal layer.

[0023] The Micro LED display device provided by the present invention is provided with a grating structure layer and an electrically controlled viewing angle adjustment layer, and the grating structure layer is located between the Micro LED light-emitting layer and the electrically controlled viewing angle adjustment layer or within the electrically controlled viewing angle adjustment layer. The grating structure layer can play a role in collecting light. The light emitted by the Micro LED light-emitting layer is first gathered and collected by the grating structure layer, and then passes through the electrically controlled viewing angle adjustment layer. The electrically controlled viewing angle adjustment layer has a first state and a second state. When the electrically controlled viewing angle adjustment layer is in the first state, the electrically controlled viewing angle adjustment layer can increase the emission angle of the light. The light gathered and collected by the grating structure layer passes through the electrically controlled viewing angle adjustment layer to increase the emission angle, so that the Micro LED display device is in a wide viewing angle mode. When the electrically controlled viewing angle adjustment layer is in the second state, the electrically controlled viewing angle adjustment layer does not change the emission angle of the light. The light gathered and collected by the grating structure layer directly passes through the electrically controlled viewing angle adjustment layer, so that the Micro LED display device is in a narrow viewing angle mode. Specifically, the electrically controlled viewing angle adjustment layer switches between a first state and a second state, enabling the Micro LED display device to switch between wide and narrow viewing angles, thereby preventing peeping. At the same time, the Micro LED display device maintains the high-quality display effects inherent in Micro LED display technology, meeting user needs for both display quality and privacy protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Schematic cross-sectional view of the Micro LED display device in the first embodiment of the present invention.

[0025] Figure 2 for Figure 1 Enlarged schematic diagram of the structure at position A in the middle.

[0026] Figure 3 Schematic diagram of the planar structure of the grating structure layer in the first embodiment of the present utility model.

[0027] Figure 4a This is a cross-sectional schematic diagram of the first embodiment of the present invention when the electrically controlled viewing angle adjustment layer is in a foggy state.

[0028] Figure 4b This is a cross-sectional schematic diagram of the first embodiment of the present invention when the electrically controlled viewing angle adjustment layer is in a transparent state.

[0029] Figures 5a to 5g Schematic diagram of the manufacturing process of the grating structure layer in the first embodiment of the present invention.

[0030] Figure 6 FIG. 1 is a schematic cross-sectional view of a grating strip in another embodiment of the present invention.

[0031] Figure 72 is a schematic cross-sectional view of a Micro LED display device in a second embodiment of the present invention.

[0032] Figure 8a FIG. 1 is a schematic cross-sectional view of a Micro LED display device in a third embodiment of the present invention.

[0033] Figure 8b for Figure 8a Enlarged schematic diagram of the structure at position B in the middle.

[0034] Figure 9a 2 is a schematic cross-sectional view of a Micro LED display device in a fourth embodiment of the present invention.

[0035] Figure 9b for Figure 9a Enlarged schematic diagram of the structure at position C in the middle.

[0036] Figure 10 2 is a schematic cross-sectional view of a Micro LED display device in a fifth embodiment of the present invention.

[0037] Figure 11 Schematic cross-sectional view of a Micro LED display device in a sixth embodiment of the present invention.

[0038] Figure 12a FIG2 is a cross-sectional schematic diagram of the Micro LED display device in the seventh embodiment of the present invention in a narrow viewing angle mode.

[0039] Figure 12b FIG. 1 is a cross-sectional schematic diagram of the Micro LED display device in the seventh embodiment of the present invention in a wide viewing angle mode. FIG.

[0040] Figure 12c Schematic diagram of the structure of liquid crystal molecules in the seventh embodiment of the present invention.

[0041] Figure 13a FIG2 is a cross-sectional schematic diagram of the Micro LED display device in the eighth embodiment of the present invention in a wide viewing angle mode. ...

[0042] Figure 13b FIG2 is a cross-sectional schematic diagram of the Micro LED display device in the eighth embodiment of the present invention in a narrow viewing angle mode. ... DETAILED DESCRIPTION

[0043] The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0044] The terms "first", "second", "third", "fourth" and so on (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.

[0045] The directional terms "up," "down," "left," "right," "front," "back," "top," and "bottom" (if any) used in the specification and claims of this 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 intended only for clarity and convenience in expressing the technical solution. It should be understood that the use of directional terms should not limit the scope of protection claimed in this application.

[0046] First embodiment

[0047] like Figures 1 to 4b As shown, the Micro LED display device provided by the first embodiment of the present invention includes a Micro LED light-emitting layer 1, an electrically controlled viewing angle adjustment layer 2 for switching between wide and narrow viewing angles, and a grating structure layer 3 that functions to collect light. The electrically controlled viewing angle adjustment layer 2 is located on the light-emitting side of the Micro LED light-emitting layer 1, and the grating structure layer 3 is located between the Micro LED light-emitting layer 1 and the electrically controlled viewing angle adjustment layer 2 or within the electrically controlled viewing angle adjustment layer 2.

[0048] The grating structure layer 3 includes a plurality of elongated grating strips 31. Each grating strip 31 extends along a first direction Y. The plurality of grating strips 31 are spaced apart along a second direction X, with the first direction Y being perpendicular to the second direction X. Each grating strip 31 includes an elongated grid block 313 and a light-shielding layer 310 disposed on the grid block 313. The light-shielding layer 310 includes a stacked metal layer 311 and a molybdenum oxide layer 312. The overlapping metal layer 311 and the molybdenum oxide layer 312 form a black film layer that absorbs and filters light emitted by the Micro LED light-emitting layer 1, achieving an effect similar to a black matrix (BM). This results in light-shielding regions 30A formed in the grating structure layer 3 at locations corresponding to the grating strips 31. The grating structure layer 3 forms light-transmitting regions 30B between adjacent grating strips 31 (i.e., light can pass through the light-transmitting regions 30B but not the light-shielding regions 30A). This creates a structure similar to Venetian blinds, giving the grating structure layer 3 a light-collecting effect. That is, the grating structure layer 3 can reduce the angle of light emission (concentrating the light). The light emitted by the Micro LED light-emitting layer 1 has a wide-angle viewing angle. This wide-angle light emitted by the Micro LED light-emitting layer 1 is concentrated by the grating structure layer 3 and emitted at a smaller angle.

[0049] The electrically controlled viewing angle adjustment layer 2 has a first state and a second state, and can be switched between the first and second states by applying different voltages. When in the first state, the electrically controlled viewing angle adjustment layer 2 increases the light emission angle, and the Micro LED display device is in a wide viewing angle mode. When in the second state, the electrically controlled viewing angle adjustment layer 2 does not change the light emission angle, and the Micro LED display device is in a narrow viewing angle mode.

[0050] Specifically, the Micro LED display device provided by the present invention is provided with a grating structure layer 3 and an electrically controlled viewing angle adjustment layer 2. The grating structure layer 3 can play a light-collecting role. Light emitted by the Micro LED light-emitting layer 1 first passes through the grating structure layer 3 to collect and gather the light, concentrating the light at a normal viewing angle, and then passes through the electrically controlled viewing angle adjustment layer 2. The electrically controlled viewing angle adjustment layer 2 has a first state and a second state. When the electrically controlled viewing angle adjustment layer 2 is in the first state, the electrically controlled viewing angle adjustment layer 2 can increase the light's exit angle. The light collected by the grating structure layer 3 passes through the electrically controlled viewing angle adjustment layer 2 to increase the exit angle, making the Micro LED display device in a wide viewing angle mode. When the electrically controlled viewing angle adjustment layer 2 is in the second state, the electrically controlled viewing angle adjustment layer 2 does not change the light's exit angle. The light collected by the grating structure layer 3 directly passes through the electrically controlled viewing angle adjustment layer 2, making the Micro LED display device in a narrow viewing angle mode. That is, the electrically controlled viewing angle adjustment layer 2 switches between the first state and the second state, allowing the Micro LED display device to switch between wide and narrow viewing angles, thereby achieving the purpose of privacy protection. At the same time, the Micro LED display device maintains the high-quality display effect of Micro LED display technology, and can meet users' needs for display effect and privacy protection at the same time.

[0051] Further, if Figure 1 and Figure 3 As shown, in this embodiment, the first direction Y is the vertical direction, and the second direction X is the horizontal direction. That is, when the Micro LED display device is used in electronic devices such as mobile phones and computers, it can achieve privacy protection in the horizontal direction. Of course, in other embodiments, the first direction Y can also be the horizontal direction, and the second direction X can be the vertical direction.

[0052] Further, 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.

[0053] Further, if Figure 1 、 Figure 4a and Figure 4b As shown, in this embodiment, the electrically controlled viewing angle adjustment layer 2 is an electrically controlled haze liquid crystal film layer, and the electrically controlled viewing angle adjustment layer 2 has a haze state and a transparent state and can switch between the two. Figure 4a As shown, when the electrically controlled viewing angle adjustment layer 2 is in a foggy state, the electrically controlled viewing angle adjustment layer 2 has a diffusion function, and the light gathered by the grating structure layer 3 can be dispersed by the electrically controlled viewing angle adjustment layer 2, thereby making the Micro LED display device present a wide viewing angle. Figure 4b As shown, when the electrically controlled viewing angle adjustment layer 2 is transparent, it has a transmissive function. Light gathered by the grating structure layer 3 can pass directly through the electrically controlled viewing angle adjustment layer 2. That is, the electrically controlled viewing angle adjustment layer 2 does not change the light's exit angle, thereby enabling the Micro LED display to present a narrow viewing angle. By controlling the electrically controlled viewing angle adjustment layer 2 to switch between the foggy and transparent states, the Micro LED display can switch between wide and narrow viewing angles, achieving the purpose of privacy protection.

[0054] Specifically, if Figure 4a and Figure 4b As shown, the electrically controlled viewing angle adjustment layer 2 includes a first substrate 21, a second substrate 22 disposed opposite the first substrate 21, and a liquid crystal layer 23 located between the first substrate 21 and the second substrate 22. The liquid crystal layer 23 is a polymer liquid crystal layer. A first transparent electrode layer 25 is provided on the side of the first substrate 21 near the liquid crystal layer 23, and a second transparent electrode layer 26 is provided on the side of the second substrate 22 near the liquid crystal layer 23. The electrically controlled viewing angle adjustment layer 2 can specifically be a PDLC (polymer dispersed liquid crystal) electrically controlled haze liquid crystal film layer, a PNLC (polymer network liquid crystal) electrically controlled haze liquid crystal film layer, or a PSCT (polymer stabilized cholesteric tectonics) electrically controlled haze liquid crystal film layer. That is, the corresponding liquid crystal layer 23 is a PDLC polymer liquid crystal layer, a PNLC polymer liquid crystal layer, or a PSCT polymer liquid crystal layer, respectively. For example, the electrically controlled viewing angle adjustment layer 2 is a PDLC electrically controlled haze liquid crystal film layer. When no voltage is applied to the first transparent electrode layer 25 and the second transparent electrode layer 26, the PDLC polymer liquid crystal layer is in a hazy state. When a corresponding voltage is applied to the first transparent electrode layer 25 and the second transparent electrode layer 26, the PDLC polymer liquid crystal layer is in a transparent state. The first transparent electrode layer 25 and the second transparent electrode layer 26 can be made of a transparent conductive material, such as indium tin oxide (ITO), indium zinc oxide (IZO), or aluminum zinc oxide.

[0055] Specifically, the liquid crystal in the PDLC polymer liquid crystal layer is a polymer-dispersed liquid crystal. The optical axes of the small droplets composed of liquid crystal molecules are freely oriented, and their refractive index does not match that of the substrate. When light passes through the substrate, it is strongly scattered by the droplets, resulting in an opaque milky white state or a translucent state (i.e., a foggy state). Applying an electric field can adjust the optical axis orientation of the liquid crystal droplets. When the refractive indices of the two match, the liquid crystal droplets appear transparent. When the electric field is removed, the liquid crystal droplets return to their original scattered light state. In other words, the PDLC polymer liquid crystal layer becomes transparent when a voltage is applied across it, and becomes foggy when no voltage is applied.

[0056] The liquid crystal in the PNLC polymer liquid crystal layer is a polymer network liquid crystal. The polymer network liquid crystal is obtained by mixing low-molecular liquid crystal with prepolymer and polymerizing under certain conditions so that the liquid crystal molecules are included in the network. Due to orientation induction, the liquid crystal is uniformly arranged. The polymer monomer also has a liquid crystal phase. Under the guest-host effect, it is also uniformly arranged. At this time, the polymerization phase separation is carried out to obtain a uniformly arranged polymer network liquid crystal. When there is no voltage, it is transparent. When voltage is applied, the negative liquid crystal tends to be parallel due to the electric field. At this time, the anchoring effect of the polymer network on the liquid crystal molecules will organize the rotation, making the liquid crystal arrangement chaotic and foggy, achieving a scattering effect. That is, the PNLC polymer liquid crystal layer is foggy when voltage is applied on both sides, and transparent when no voltage is applied.

[0057] The liquid crystal in the PSCT polymer liquid crystal layer is a stable polymer cholesteric fabric. When a voltage is applied across it, it becomes foggy and transparent when no voltage is applied. The operating principles of PDLC, PNLC, and PSCT polymer liquid crystal layers can be found in existing technology and will not be elaborated here.

[0058] Furthermore, in this embodiment, the material of the metal layer 311 can be Al, Cu, Mo, Ti, etc. The grid block 313 can be made of UV glue, photoresist or OC, etc. The molybdenum oxide layer 312 can be made of MoO x Target coating is made.

[0059] Further, if Figure 1 and Figure 2 As shown, in this embodiment, the grating structure layer 3 is located between the Micro LED light-emitting layer 1 and the electrically controlled viewing angle adjustment layer 2. The Micro LED display device also includes a first base substrate 4, which can be a transparent substrate such as a glass substrate or a film substrate (e.g., a polyimide substrate). The first base substrate 4 is located between the Micro LED light-emitting layer 1 and the electrically controlled viewing angle adjustment layer 2, and the grating structure layer 3 is disposed on the first base substrate 4. Specifically, in this embodiment, the grating structure layer 3 is disposed on a side of the first base substrate 4 close to the Micro LED light-emitting layer 1.

[0060] Further, if Figure 1 and Figure 2 As shown, in this embodiment, the grating structure layer 3 further includes a flattening layer 32 (OC), and the grating strips 31 are disposed within the flattening layer 32. The flattening layer 32 not only flattens the surface of the grating structure layer 3 but also acts as an insulator (preventing the grating strips 31 from contacting the Micro LED light-emitting layer 1 or other structures and causing a short circuit), and also protects the grating strips 31.

[0061] Further, if Figure 1 and Figure 2 As shown, in this embodiment, the light shielding layer 310 includes a molybdenum oxide layer 312 and a metal layer 311. The molybdenum oxide layer 312 is located on the side of the metal layer 311 close to the Micro LED light emitting layer 1 (i.e., Figure 1 and Figure 2 As shown, the molybdenum oxide layer 312 is located on the lower side of the metal layer 311; during manufacturing, the metal layer 311 is first manufactured on the grid block 313, and then the molybdenum oxide layer 312 is manufactured on the metal layer 311).

[0062] Furthermore, in this embodiment, the thickness of the metal layer 311 is 200 nm to 300 nm, and the thickness of the molybdenum oxide layer 312 is 30 nm to 100 nm, so that the light shielding layer 310 can achieve a good blackening and light shielding effect.

[0063] Further, if Figures 1 to 3 As shown, in this embodiment, the height H of the grating strips 31 is 50 microns to 100 microns, and the spacing L between adjacent grating strips 31 is 40 microns to 50 microns, so that the grating structure layer 3 has a good light collecting effect.

[0064] Further, if Figure 1 and Figure 2 As shown, in this embodiment, in the direction from the Micro LED light-emitting layer 1 toward the electrically controlled viewing angle adjustment layer 2 (i.e., the direction indicated by the arrow S in the figure, i.e., from bottom to top in the figure), the cross-section of the grid block 313 has a structure with gradually increasing width, and the cross-section of the grating strip 31 has a structure with gradually increasing width, thereby making the grating structure layer 3 have a better light collection effect. Of course, in other embodiments, in the direction from the Micro LED light-emitting layer 1 toward the electrically controlled viewing angle adjustment layer 2, the cross-section of the grid block 313 can also have a structure with gradually decreasing width, and the cross-section of the grating strip 31 can also have a structure with gradually decreasing width; alternatively, the cross-section of the grid block 313 can also have a structure with a constant width (e.g., a rectangular cross-section), and the cross-section of the grating strip 31 can also have a structure with a constant width.

[0065] Further, if Figure 1 and Figure 2As shown, in this embodiment, the cross section of the grid block 313 is an inverted trapezoidal structure, the light shielding layer 310 is provided on the bottom wall 3131 and the side wall 3132 of the grid block 313, and the cross section of the grating strip 31 is an inverted trapezoidal structure, thereby making the grating structure layer 3 have a better light collecting effect. Of course, in other embodiments, the cross sections of the grid block 313 and the grating strip 31 may also be other shapes, for example Figure 6 The arc-shaped convex structure shown.

[0066] Further, if Figure 1 As shown, in this embodiment, the Micro LED light-emitting layer 1 includes multiple red LEDs 11, multiple green LEDs 12, and multiple blue LEDs 13, which are arranged in an array. The red LEDs 11, green LEDs 12, and blue LEDs 13 are all Micro LEDs. The red LEDs 11 emit red light, the green LEDs 12 emit green light, and the blue LEDs 13 emit blue light, thereby achieving full-color display of the Micro LED display device.

[0067] Further, if Figure 1 As shown, in this embodiment, the Micro LED display device further includes a second base substrate 5 and a control electrode layer 6. The second base substrate 5 is located on a side of the Micro LED light-emitting layer 1 away from the electrically controlled viewing angle adjustment layer 2. The control electrode layer 6 is located between the second base substrate 5 and the Micro LED light-emitting layer 1. The control electrode layer 6 and the Micro LED light-emitting layer 1 are both disposed on the second base substrate 5. The control electrode layer 6 is electrically connected to the Micro LED light-emitting layer 1 and is used to control the switching and brightness of the Micro LED light-emitting layer 1.

[0068] Further, if Figure 1 As shown, in this embodiment, the Micro LED display device further includes a protective layer 7, which is located on the side of the electrically controlled viewing angle adjustment layer 2 away from the Micro LED light-emitting layer 1. The protective layer 7 plays a protective and anti-glare role.

[0069] like Figures 5a to 5g As shown, the method for manufacturing the grating structure layer 3 in this embodiment includes the following steps:

[0070] (1) Figure 5a As shown, a photoresist layer 301 (can also be made of other materials) is made on the first substrate 4, the photoresist layer 301 is imprinted using a mold 9, and then the mold 9 is demoulded (ie, the mold 9 is separated from the photoresist layer 301), and the following is obtained: Figure 5bThe mold 9 is provided with a plurality of spaced protrusions 91, with grooves 92 formed between adjacent protrusions 91; after imprinting, the photoresist layer 301 forms grid blocks 313 at positions corresponding to the grooves 92, and the photoresist layer 301 forms channels 301a at positions corresponding to the protrusions 91.

[0071] (2) Figure 5c As shown, the redundant photoresist layer on the inner wall of the trench 301a is etched (specifically including steps such as exposure and development) so that the photoresist layer on the bottom wall of the trench 301a is etched away to obtain a plurality of trapezoidal grid blocks 313.

[0072] (3) Figure 5d As shown, a metal film layer 302 covering a plurality of grid blocks 313 is formed on the first base substrate 4 .

[0073] (4) Figure 5e As shown, a molybdenum oxide thin film layer 303 is formed on the metal thin film layer 302.

[0074] (5) Figure 5f As shown, the metal film layer 302 and the molybdenum oxide film layer 303 are etched (specifically including the steps of photoresist coating, exposure, development, etching, and photoresist removal), and the metal film layer 302 and the molybdenum oxide film layer 303 on the bottom wall of the trench are removed, so that a stacked metal layer 311 and a molybdenum oxide layer 312 are formed on the grid block 313, and a plurality of spaced grating strips 31 are obtained.

[0075] (6) Figure 5g As shown, a flat layer 32 covering a plurality of grating strips 31 is formed on the first base substrate 4 , thereby obtaining a grating structure layer 3 .

[0076] The Micro LED display device provided by the present invention is provided with a grating structure layer 3 and an electrically controlled viewing angle adjustment layer 2. The grating structure layer 3 can function as a light collector. Light emitted by the Micro LED light-emitting layer 1 first passes through the grating structure layer 3 to gather and collect the light, concentrating it at a normal viewing angle, and then passes through the electrically controlled viewing angle adjustment layer 2. The electrically controlled viewing angle adjustment layer 2 has a first state and a second state. When the electrically controlled viewing angle adjustment layer 2 is in the first state, the electrically controlled viewing angle adjustment layer 2 can increase the light's exit angle. The light gathered and collected by the grating structure layer 3 passes through the electrically controlled viewing angle adjustment layer 2 to increase the exit angle, thereby enabling the Micro LED display device to adopt a wide viewing angle mode. When the electrically controlled viewing angle adjustment layer 2 is in the second state, the electrically controlled viewing angle adjustment layer 2 does not change the light's exit angle. The light gathered and collected by the grating structure layer 3 passes directly through the electrically controlled viewing angle adjustment layer 2, thereby enabling the Micro LED display device to adopt a narrow viewing angle mode. That is, the switching of the electrically controlled viewing angle adjustment layer 2 between the first state and the second state enables the Micro LED display device to switch between wide and narrow viewing angles, thereby achieving the purpose of privacy protection. At the same time, the Micro LED display device maintains the high-quality display effect of Micro LED display technology, and can meet users' needs for display effect and privacy protection at the same time.

[0077] Second embodiment

[0078] like Figure 7 As shown, the Micro LED display device provided by the second embodiment of the present invention is basically the same as the first embodiment, except that the grating structure layer 3 is arranged in a different position.

[0079] Specifically, in this embodiment, the grating structure layer 3 is disposed on a side of the first base substrate 4 away from the Micro LED light-emitting layer 1 , that is, the grating structure layer 3 is located between the first base substrate 4 and the electrically controlled viewing angle adjustment layer 2 .

[0080] The other structures and functions of this embodiment are the same as or similar to those of the first embodiment and are not described in detail here.

[0081] Third embodiment

[0082] like Figure 8a and Figure 8b As shown, the Micro LED display device provided by the third embodiment of the present invention is substantially the same as that of the second embodiment. The grating structure layer 3 is also arranged on the side of the first base substrate 4 away from the Micro LED light-emitting layer 1. The difference lies in the structure of the grating structure layer 3.

[0083] Specifically, in this embodiment, the cross-section of the grid blocks 313 and the cross-section of the grating strips 31 gradually decrease in width from the Micro LED light-emitting layer 1 toward the electrically controlled viewing angle adjustment layer 2. Specifically, the cross-section of the grid blocks 313 and the cross-section of the grating strips 31 are trapezoidal in shape.

[0084] Meanwhile, the light shielding layer 310 includes a molybdenum oxide layer 312 and a metal layer 311. The molybdenum oxide layer 312 is located on the side of the metal layer 311 away from the Micro LED light-emitting layer 1 (i.e., the molybdenum oxide layer 312 is located on the upper side of the metal layer 311; during fabrication, the metal layer 311 is first fabricated on the grid block 313, and then the molybdenum oxide layer 312 is fabricated on the metal layer 311). Compared to the first and second embodiments, since the molybdenum oxide layer 312 in this embodiment is located on the light-emitting side of the metal layer 311, it can prevent ambient light reflection caused by the metal layer 311 (if the metal layer 311 is located on the light-emitting side of the molybdenum oxide layer 312, external ambient light may reflect after being irradiated by the metal layer 311; however, external ambient light does not reflect after being irradiated by the molybdenum oxide layer 312).

[0085] The other structures and functions of this embodiment are the same as or similar to those of the second embodiment and are not described in detail here.

[0086] Fourth embodiment

[0087] like Figure 9a and Figure 9b As shown, the Micro LED display device provided by the fourth embodiment of the present invention is substantially the same as that of the first embodiment, except that the structure of the light shielding layer 310 in the grating structure layer 3 is different.

[0088] Specifically, in this embodiment, the light shielding layer 310 includes two molybdenum oxide layers 312 and a metal layer 311, with the metal layer 311 sandwiched between the two molybdenum oxide layers 312 (during fabrication, a molybdenum oxide layer 312 is first fabricated on the grid block 313, the metal layer 311 is then fabricated on the molybdenum oxide layer 312, and finally the molybdenum oxide layer 312 is fabricated on the metal layer 311). This improves the blackening and light shielding effect of the light shielding layer 310 while preventing ambient light reflection caused by the metal layer 311.

[0089] Fifth embodiment

[0090] like Figure 10 As shown, the Micro LED display device provided by the fifth embodiment of the present invention is substantially the same as that of the first embodiment, except that the grating structure layer 3 is disposed at a different position.

[0091] Specifically, in this embodiment, the first substrate 4 is not disposed between the Micro LED light-emitting layer 1 and the electrically controlled viewing angle adjustment layer 2. The grating structure layer 3 is located between the Micro LED light-emitting layer 1 and the electrically controlled viewing angle adjustment layer 2, and the grating structure layer 3 is disposed on the side of the electrically controlled viewing angle adjustment layer 2 close to the Micro LED light-emitting layer 1.

[0092] The other structures and functions of this embodiment are the same as or similar to those of the first embodiment and are not described in detail here.

[0093] Sixth embodiment

[0094] like Figure 11 As shown, the Micro LED display device provided by the sixth embodiment of the present invention is substantially the same as that of the first embodiment, except that the grating structure layer 3 is disposed at a different position.

[0095] Specifically, in this embodiment, no first base substrate 4 is provided between the Micro LED light-emitting layer 1 and the electrically controlled viewing angle adjustment layer 2. The grating structure layer 3 is located within the electrically controlled viewing angle adjustment layer 2. The electrically controlled viewing angle adjustment layer 2 includes a first substrate 21, a second substrate 22 disposed on the side of the first substrate 21 away from the Micro LED light-emitting layer 1, and a liquid crystal layer 23 located between the first substrate 21 and the second substrate 22 (the liquid crystal layer 23 may be the polymer liquid crystal layer described above or a liquid crystal layer having a birefringence as described below). A first transparent electrode layer 25 is provided on the side of the first substrate 21 near the liquid crystal layer 23, and a second transparent electrode layer 26 is provided on the side of the second substrate 22 near the liquid crystal layer 23. The grating structure layer 3 is provided on the side of the first substrate 21 near the liquid crystal layer 23, and is located between the first substrate 21 and the first transparent electrode layer 25.

[0096] The other structures and functions of this embodiment are the same as or similar to those of the first embodiment and are not described in detail here.

[0097] Seventh embodiment

[0098] like Figures 12a to 12c As shown, the Micro LED display device provided by the seventh embodiment of the present invention is substantially the same as that of the first embodiment, except that the structure and working principle of the electrically controlled viewing angle adjustment layer 2 are different.

[0099] Specifically, in this embodiment, the electrically controlled viewing angle adjustment layer 2 is a viewing angle control liquid crystal box that can adjust the propagation direction of light. The electrically controlled viewing angle adjustment layer 2 includes a first substrate 21, a second substrate 22 arranged on the side of the first substrate 21 away from the Micro LED light-emitting layer 1, a refractive layer 24, and a liquid crystal layer 23 located between the first substrate 21 and the second substrate 22. A first transparent electrode layer 25 and a first alignment layer (not shown) are provided on the side of the first substrate 21 close to the liquid crystal layer 23, and a second transparent electrode layer 26 and a second alignment layer (not shown) are provided on the side of the second substrate 22 close to the liquid crystal layer 23. The liquid crystal layer 23 includes a plurality of liquid crystal molecules 231, and the liquid crystal molecules 231 have a birefringence. The two refractive indices of the liquid crystal molecules 231 are a first refractive index and a second refractive index, respectively, wherein the first refractive index is greater than the second refractive index.

[0100] The refractive layer 24 is capable of refracting light and is disposed on a side of the first substrate 21 close to the liquid crystal layer 23. The refractive layer 24 is located on a side of the first transparent electrode layer 25 close to the liquid crystal layer 23. The refractive index of the refractive layer 24 is equal to the first refractive index of the liquid crystal molecules 231, that is, the refractive index of the refractive layer 24 is greater than the second refractive index of the liquid crystal molecules 231.

[0101] Specifically, if Figure 12a As shown, the light emitted by the Micro LED light emitting layer 1 first passes through the grating structure layer 3 to gather the light. When the refractive index of the liquid crystal molecules 231 in the liquid crystal layer 23 is the first refractive index, since the refractive index of the refractive layer 24 is equal to the first refractive index of the liquid crystal molecules 231, the refractive index of the refractive layer 24 is the same as the refractive index of the liquid crystal layer 23. When the light passes through the refractive layer 24 and the liquid crystal layer 23, its propagation direction does not change, so the Micro LED display device is in a narrow viewing angle mode. Figure 12b As shown, light emitted from the Micro LED light-emitting layer 1 is first focused by the grating structure layer 3. When the refractive index of the liquid crystal molecules 231 in the liquid crystal layer 23 is the second refractive index, since the refractive index of the refractive layer 24 is greater than the second refractive index of the liquid crystal molecules 231, the refractive index of the refractive layer 24 is greater than the refractive index of the liquid crystal layer 23. At this time, the refractive index of the refractive layer 24 is greater than the refractive index of the liquid crystal layer 23. As a result, the light will be refracted to the left and right when passing through the refractive layer 24 and the liquid crystal layer 23, thereby increasing the light emission angle (when light enters a medium with a high refractive index into a medium with a low refractive index, it will be deflected in a direction away from the normal line). Therefore, the Micro LED display device exhibits a wide viewing angle mode.

[0102] In this embodiment, the liquid crystal molecules 231 are negative liquid crystal molecules, and the liquid crystal molecules 231 have a short-axis refractive index n o and the major axis refractive index n e , short-axis refractive index n o Greater than the major axis refractive index n e, that is, the first refractive index of the liquid crystal molecule 231 is the short-axis refractive index n o , the second refractive index is the long axis refractive index n e .like Figure 12a As shown, in the initial state without power, the liquid crystal molecules 231 are oriented and arranged, and the long axis of the liquid crystal molecules 231 is perpendicular to the first substrate 21. After the light is gathered by the grating structure layer 3, it enters the liquid crystal cell perpendicular to the short axis of the liquid crystal molecules 231. Since the refractive index of the refractive layer 24 is equal to the short axis refractive index n of the liquid crystal molecules 231, the liquid crystal molecules 231 are aligned. o , so the propagation direction of the light does not change when passing through the refractive layer 24 and the liquid crystal layer 23, so the Micro LED display device is in a narrow viewing angle mode. Figure 12b As shown, when the first transparent electrode layer 25 and the second transparent electrode layer 26 are powered, the liquid crystal molecules 231 rotate 90 degrees, and the light rays gathered by the grating structure layer 3 enter the liquid crystal cell perpendicular to the long axis of the liquid crystal molecules 231. Since the refractive index of the refractive layer 24 is greater than the long axis refractive index n of the liquid crystal molecules 231, the liquid crystal molecules 231 rotate 90 degrees. e When light passes through the refractive layer 24 and the liquid crystal layer 23, it will be refracted to the left and right sides, thereby increasing the emission angle of the light, so the Micro LED display device is in a wide viewing angle mode.

[0103] Of course, in other embodiments, the liquid crystal molecules 231 may also be positive liquid crystal molecules, and the liquid crystal molecules 231 have a short-axis refractive index n o and the major axis refractive index n e , short-axis refractive index n o Less than the major axis refractive index n e , that is, the first refractive index of the liquid crystal molecule 231 is the long-axis refractive index n e , the second refractive index is the short axis refractive index n o .

[0104] Furthermore, in this embodiment, the refractive layer 24 may be made of UV adhesive or the like, and may have an uneven structure formed by embossing. The cross section of the refractive layer 24 may be triangular, trapezoidal, or semicircular.

[0105] Compared with the first embodiment, since the electrically controlled viewing angle adjustment layer 2 in the first embodiment is an electrically controlled haze liquid crystal film layer, the electrically controlled haze liquid crystal film layer will diffuse light to the surroundings when it is in a foggy state, and the light loss is slightly higher; while this embodiment uses the refractive layer 24 and the liquid crystal layer 23 to refract the light, the light loss is smaller, and the light utilization rate is higher.

[0106] The other structures and functions of this embodiment are the same as or similar to those of the first embodiment and are not described in detail here.

[0107] Eighth embodiment

[0108] like Figure 13aand Figure 13b As shown, the Micro LED display device provided by the eighth embodiment of the present invention is substantially the same as the seventh embodiment, except that the refractive layer 24 is disposed at a different position and the relationship between the refractive index of the refractive layer 24 and the refractive index of the liquid crystal molecules 231 is different.

[0109] Specifically, in this embodiment, the refractive layer 24 is disposed on a side of the second substrate 22 proximal to the liquid crystal layer 23, and the refractive layer 24 is located on a side of the second transparent electrode layer 26 proximal to the liquid crystal layer 23. The liquid crystal layer 23 includes a plurality of liquid crystal molecules 231. The liquid crystal molecules 231 have a birefringence, with the two refractive indices of the liquid crystal molecules 231 being a first refractive index and a second refractive index, wherein the first refractive index is greater than the second refractive index. The refractive index of the refractive layer 24 is equal to the second refractive index of the liquid crystal layer 23, that is, the refractive index of the refractive layer 24 is less than the first refractive index of the liquid crystal layer 23.

[0110] In this embodiment, the liquid crystal molecules 231 are negative liquid crystal molecules, and the liquid crystal molecules 231 have a short-axis refractive index n o and the major axis refractive index n e , short-axis refractive index n o Greater than the major axis refractive index n e , that is, the first refractive index of the liquid crystal molecule 231 is the short-axis refractive index n o , the second refractive index is the long axis refractive index n e .

[0111] like Figure 13a As shown, in the initial state without power, the liquid crystal molecules 231 are oriented and arranged, and the long axis of the liquid crystal molecules 231 is perpendicular to the first substrate 21. After the light is gathered by the grating structure layer 3, it enters the liquid crystal cell perpendicular to the short axis of the liquid crystal molecules 231. Since the refractive index of the refractive layer 24 is less than the short axis refractive index n of the liquid crystal molecules 231, the liquid crystal molecules 231 are aligned. o When the light passes through the refractive layer 24 and the liquid crystal layer 23, it will be refracted to the left and right sides, thereby increasing the light emission angle, so the Micro LED display device is in a wide viewing angle mode. Figure 13b As shown, when the first transparent electrode layer 25 and the second transparent electrode layer 26 are powered, the liquid crystal molecules 231 rotate 90 degrees, and the light rays gathered by the grating structure layer 3 enter the liquid crystal cell perpendicular to the long axis of the liquid crystal molecules 231. Since the refractive index of the refractive layer 24 is equal to the long axis refractive index n of the liquid crystal molecules 231, the liquid crystal molecules 231 rotate 90 degrees. e Therefore, the propagation direction of the light does not change when passing through the refractive layer 24 and the liquid crystal layer 23, so the Micro LED display device is in a narrow viewing angle mode.

[0112] Of course, in other embodiments, the liquid crystal molecules 231 may also be positive liquid crystal molecules, and the liquid crystal molecules 231 have a short-axis refractive index n oand the major axis refractive index n e , short-axis refractive index n o Less than the major axis refractive index n e , that is, the first refractive index of the liquid crystal molecule 231 is the long-axis refractive index n e , the second refractive index is the short axis refractive index n o .

[0113] The other structures and functions of this embodiment are the same as or similar to those of the seventh embodiment and are not described in detail here.

[0114] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A Micro LED display device, characterized in that: The device comprises a Micro LED light-emitting layer (1), an electrically controlled viewing angle adjustment layer (2) for switching between wide and narrow viewing angles, and a grating structure layer (3) for collecting light, wherein the electrically controlled viewing angle adjustment layer (2) is located on the light-emitting side of the Micro LED light-emitting layer (1), and the grating structure layer (3) is located between the Micro LED light-emitting layer (1) and the electrically controlled viewing angle adjustment layer (2) or within the electrically controlled viewing angle adjustment layer (2); The grating structure layer (3) comprises a plurality of grating strips (31) in a strip-shaped structure, each of the grating strips (31) extending along a first direction (Y), and the plurality of the grating strips (31) arranged at intervals along a second direction (X), wherein the first direction (Y) is perpendicular to the second direction (X); each of the grating strips (31) comprises a grid block (313) and a light shielding layer (310) arranged on the grid block (313), the light shielding layer (310) comprising a stacked metal layer (311) and a molybdenum oxide layer (312); the grating structure layer (3) forms a light shielding area (30A) at a position corresponding to the grating strip (31), and the grating structure layer (3) forms a light-transmitting area (30B) between adjacent grating strips (31); The electrically controlled viewing angle adjustment layer (2) has a first state and a second state. When the electrically controlled viewing angle adjustment layer (2) is in the first state, the electrically controlled viewing angle adjustment layer (2) can increase the light emission angle, and the Micro LED display device is in a wide viewing angle mode. When the electrically controlled viewing angle adjustment layer (2) is in the second state, the electrically controlled viewing angle adjustment layer (2) does not change the light emission angle, and the Micro LED display device is in a narrow viewing angle mode.

2. The Micro LED display device according to claim 1, wherein: The electrically controlled viewing angle adjustment layer (2) is a PDLC electrically controlled haze liquid crystal film layer, a PNLC electrically controlled haze liquid crystal film layer or a PSCT electrically controlled haze liquid crystal film layer.

3. The Micro LED display device according to claim 1, wherein: The electrically controlled viewing angle adjustment layer (2) is a viewing angle control liquid crystal box, and comprises a first substrate (21), a second substrate (22) arranged on a side of the first substrate (21) away from the Micro LED light-emitting layer (1), a refractive layer (24), and a liquid crystal layer (23) located between the first substrate (21) and the second substrate (22); the liquid crystal layer (23) comprises a plurality of liquid crystal molecules (231), the liquid crystal molecules (231) having a double refractive index, the two refractive indices of the liquid crystal molecules (231) being respectively a first refractive index and a second refractive index, and the first refractive index being greater than the second refractive index; The refractive layer (24) is arranged on a side of the first substrate (21) close to the liquid crystal layer (23), and the refractive index of the refractive layer (24) is equal to the first refractive index of the liquid crystal molecules (231); Alternatively, the refractive layer (24) is arranged on a side of the second substrate (22) close to the liquid crystal layer (23), and the refractive index of the refractive layer (24) is equal to the second refractive index of the liquid crystal layer (23).

4. The Micro LED display device according to claim 1, wherein: The light shielding layer (310) comprises a layer of the molybdenum oxide layer (312) and a layer of the metal layer (311), wherein the molybdenum oxide layer (312) is located on a side of the metal layer (311) close to the Micro LED light-emitting layer (1); Alternatively, the light shielding layer (310) comprises a layer of the molybdenum oxide layer (312) and a layer of the metal layer (311), and the molybdenum oxide layer (312) is located on a side of the metal layer (311) away from the Micro LED light-emitting layer (1); Alternatively, the light shielding layer (310) comprises two layers of the molybdenum oxide layers (312) and one layer of the metal layer (311), and the metal layer (311) is sandwiched between the two layers of the molybdenum oxide layers (312).

5. The Micro LED display device according to claim 1, wherein: In a direction from the Micro LED light-emitting layer (1) toward the electrically controlled viewing angle adjustment layer (2), the cross section of the grid block (313) presents a structure with a gradually increasing width, and the cross section of the grating strip (31) presents a structure with a gradually increasing width.

6. The Micro LED display device according to claim 5, wherein: The cross section of the grid block (313) is an inverted trapezoidal structure, the light shielding layer (310) is arranged on the bottom wall (3131) and the side wall (3132) of the grid block (313), and the cross section of the grating strip (31) is an inverted trapezoidal structure.

7. The Micro LED display device according to claim 1, wherein: The height (H) of the grating strips (31) is 50 micrometers to 100 micrometers, and the spacing (L) between adjacent grating strips (31) is 40 micrometers to 50 micrometers.

8. The Micro LED display device according to claim 1, wherein: The thickness of the metal layer (311) is 200 nanometers to 300 nanometers, and the thickness of the molybdenum oxide layer (312) is 30 nanometers to 100 nanometers.

9. The Micro LED display device according to claim 1, wherein: The grating structure layer (3) further comprises a flat layer (32), and the grating strips (31) are arranged in the flat layer (32).

10. The Micro LED display device according to any one of claims 1 to 9, wherein: The grating structure layer (3) is located between the Micro LED light-emitting layer (1) and the electrically controlled viewing angle adjustment layer (2), the Micro LED display device further comprises a first substrate (4), the first substrate (4) is located between the Micro LED light-emitting layer (1) and the electrically controlled viewing angle adjustment layer (2), and the grating structure layer (3) is arranged on the first substrate (4); Alternatively, the grating structure layer (3) is located between the Micro LED light-emitting layer (1) and the electrically controlled viewing angle adjustment layer (2), and the grating structure layer (3) is arranged on a side of the electrically controlled viewing angle adjustment layer (2) close to the Micro LED light-emitting layer (1); Alternatively, the grating structure layer (3) is located in the electrically controlled viewing angle adjustment layer (2), the electrically controlled viewing angle adjustment layer (2) comprises a first substrate (21), a second substrate (22) arranged on a side of the first substrate (21) away from the Micro LED light-emitting layer (1), and a liquid crystal layer (23) located between the first substrate (21) and the second substrate (22), and the grating structure layer (3) is arranged on a side of the first substrate (21) close to the liquid crystal layer (23).

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