OLED display device based on light management structure and preparation method thereof

Abstract

The invention relates to the technical field of OLEDs, in particular to an OLED display device based on a light management structure and a preparation method of the OLED display device. The invention provides an OLED (Organic Light Emitting Diode) display device based on a light management structure, which comprises an OLED with a packaging structure and a light management layer arranged on the surface of the OLED with the packaging structure, and is characterized in that the surface of the light management layer is also provided with a microlens array. According to the OLED display device, the light emitting efficiency and the display effect can be remarkably improved, meanwhile, the light angle distribution is optimized, and the visual angle range is expanded.

Description

Technical Field

[0001] The present invention relates to the technical field of OLED, and in particular, to an OLED display device based on a light management structure and a preparation method thereof. Background Art

[0002] OLED, also known as organic electroluminescent display and organic light-emitting semiconductor. OLED belongs to a current-driven organic light-emitting device, which is a display that emits light through the injection and recombination of carriers, and the luminous intensity is proportional to the injected current. OLED belongs to a current-driven organic light-emitting device, which is a phenomenon of emitting light through the injection and recombination of carriers, and the luminous intensity is proportional to the injected current. Under the action of an electric field in OLED, holes generated by the anode and electrons generated by the cathode will move, and are respectively injected into the hole transport layer and the electron transport layer, and migrate to the light-emitting layer. When the two meet in the light-emitting layer, energy excitons are generated, which excite the light-emitting molecules to finally generate visible light.

[0003] The structure of a traditional OLED mainly includes a substrate, an anode, a light-emitting layer, a cathode, and a light management layer stacked in sequence. The light management layer includes multiple optical thin films, such as an antireflection film, a reflection film, and a polarization film, etc. These thin films can effectively control the propagation path of light, reduce light loss, and thus improve the light extraction efficiency. However, its light extraction efficiency still cannot meet the requirements of the high-end display market, and there are also problems such as color deviation and limited viewing angle. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide an OLED display device based on a light management structure and a preparation method thereof. The OLED display device of the present invention can significantly improve the light extraction efficiency and display effect, and at the same time optimize the light angle distribution and expand the viewing angle range.

[0005] In order to achieve the above-mentioned invention purpose, the present invention provides the following technical solutions:

[0006] The present invention provides an OLED display device based on a light management structure, including an OLED with a packaging structure and a light management layer disposed on the surface of the OLED with the packaging structure. It is characterized in that a microlens array is further disposed on the surface of the light management layer.

[0007] Preferably, the shape of the microlenses in the microlens array is hemispherical or paraboloidal.

[0008] Preferably, the diameter of the microlenses is 20 - 200 μm, and the height is 10 - 100 μm.

[0009] Preferably, the arrangement mode of the microlenses is a rectangular array, a hexagonal array, or a random arrangement.

[0010] Preferably, the distance between adjacent microlenses is 50 - 500 μm.

[0011] Preferably, the material of the microlenses in the microlens array is optical glass or transparent polymer.

[0012] Preferably, the transparent polymer includes one or more of polymethyl methacrylate, polycarbonate, cycloolefin copolymer, and polyvinyl butyral.

[0013] Preferably, the light management layer includes multiple optical thin films;

[0014] The multiple optical thin films include two or more of an antireflection film, a reflective film, and a polarization film arranged in a stacked manner.

[0015] Preferably, the material of the antireflection film is silicon dioxide and / or magnesium fluoride;

[0016] The material of the reflective film is metal or metal oxide;

[0017] The material of the polarization film is polyvinyl alcohol.

[0018] The present invention also provides a method for manufacturing the OLED display device according to the above technical solution, including the following steps:

[0019] After preparing the light management layer on the surface of the OLED with a packaging structure, a microlens array is prepared on the surface of the light management layer by nanoimprinting or laser etching technology to obtain the OLED display device.

[0020] The present invention provides an OLED display device based on a light management structure, including an OLED with a packaging structure and a light management layer disposed on the surface of the OLED of the packaging structure. It is characterized in that a microlens array is further disposed on the surface of the light management layer. By introducing the microlens array, the present invention further optimizes the distribution and focusing of light, significantly enhances the brightness and clarity of the display screen, makes the screen more vivid and delicate, and the colors more saturated and real; at the same time, it successfully realizes the efficient collection and uniform distribution of light, effectively reduces glare and ghosting phenomena, enables viewers to enjoy a consistent visual effect at different angles, significantly expands the viewing angle range, and can obtain a clear and bright screen whether viewed from the front or the side, greatly improving the user's viewing experience; finally, the combination of the light management structure and the microlens array effectively reduces light loss, improves the utilization rate of light, and at the same time significantly reduces energy consumption while ensuring the same brightness, achieving a more energy-saving and environmentally friendly display effect. Finally, it also enhances the stability and durability of the display device, extends the service life, and reduces the maintenance cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1The OLED display device based on the light management structure prepared in Embodiment 1 of the present invention;

[0022] Figure 2 It is a schematic structural diagram of the light management layer and the microlens array in the OLED display device described in Embodiment 1 of the present invention;

[0023] Among them, 1 is the substrate, 2 is the anode, 3 is the light-emitting layer, 4 is the cathode, 5 is the light management layer, 6 is the antireflection film, 7 is the reflection film, 8 is the polarizing film, and 9 is the microlens array. Detailed implementation manners

[0024] The present invention provides an OLED display device based on a light management structure, including an OLED having a packaging structure and a light management layer provided on the surface of the OLED of the packaging structure, and a microlens array is further provided on the surface of the light management layer.

[0025] In the present invention, the shape of the microlenses in the microlens array is preferably hemispherical or paraboloidal, and more preferably hemispherical. In the present invention, selecting the above shapes for the microlenses can ensure uniform light distribution in all directions, while reducing light scattering and loss caused by irregular shapes, thereby improving the uniformity and clarity of the display screen.

[0026] In the present invention, the diameter of the microlenses is preferably 20 - 200 μm, and more preferably 50 - 100 μm; the height of the microlenses is preferably 10 - 100 μm, and more preferably 15 - 50 μm. In the present invention, controlling the size of the microlenses within the above range can further optimize the light refraction and focusing effects, ensure that the light can be accurately focused on the display area, and improve the brightness and color saturation of the display screen.

[0027] In the present invention, the arrangement pattern of the microlenses is preferably a rectangular array, a hexagonal array or a random arrangement, more preferably a rectangular array or a hexagonal array, and most preferably a rectangular array. In the present invention, controlling the arrangement pattern of the microlenses within the above range can further ensure uniform light distribution in all directions, while reducing light interference and loss caused by irregular arrangements, thereby improving the uniformity and stability of the display screen.

[0028] In the present invention, the distance between adjacent microlenses is preferably 50 - 500 μm, and more preferably 100 - 300 μm. In the present invention, controlling the distance between adjacent microlenses within the above range can further ensure that the light can pass through the microlens array evenly, while avoiding light interference and loss between adjacent microlenses, thereby improving the clarity and brightness of the display screen.

[0029] In the present invention, the material of the microlenses in the microlens array is preferably optical glass or a transparent polymer; the transparent polymer preferably includes one or more of polymethyl methacrylate (PMMA), polycarbonate (PC), cycloolefin copolymer (COC), and polyvinyl butyral (PVB). When the transparent polymer is two or more of the above specific selections, the present invention does not have any special limitation on the ratio of the above specific substances, and they can be mixed in any ratio. In the present invention, controlling the material of the microlenses within the above range can further ensure that the microlenses have good light transmittance, weather resistance, and processing performance, while reducing the manufacturing cost.

[0030] In the present invention, the light management layer preferably includes multiple optical thin films; the multiple optical thin films preferably include two or more of an antireflection film, a reflective film, and a polarizing film arranged in layers. The present invention does not have any special limitation on the stacking order of each layer in the multiple optical thin film layer, and the stacking order well-known to those skilled in the art can be adopted.

[0031] In the present invention, the material of the antireflection film is preferably silicon dioxide and / or magnesium fluoride. In the present invention, the thickness of the antireflection film is preferably 50 - 200 nm, more preferably 100 - 150 nm. In the present invention, by controlling the material and thickness of the antireflection film, the reflection loss of light at the interface can be effectively reduced, the light transmittance can be improved, and more effective light can be ensured to enter the display area.

[0032] In the present invention, the material of the reflective film is preferably a metal or a metal oxide; the metal oxide is preferably an oxide of aluminum or silver; the metal is preferably aluminum or silver. In the present invention, the thickness of the reflective film is preferably 50 - 200 nm, more preferably 100 - 150 nm. In the present invention, selecting the above suitable material for the reflective layer for the material of the light-emitting layer can reflect the light of non-target wavelengths back to the light-emitting layer for reuse, which not only enhances the intensity of the target light but also reduces color deviation and improves color saturation.

[0033] In the present invention, the material of the polarizing film is preferably polyvinyl alcohol-iodine complex (PVA-I, iodine-coated polyvinyl alcohol). The thickness of the polarizing film is preferably 10 - 50 μm, more preferably 20 - 30 μm. In the present invention, the polarizing film can effectively eliminate the non-polarized components in the light and improve the contrast and clarity of the display screen.

[0034] The present invention also provides a method for manufacturing the OLED display device according to the above technical solution, including the following steps:

[0035] After preparing a light management layer on the surface of an OLED with a packaging structure, a microlens array is prepared on the surface of the light management layer by nanoimprinting or laser etching to obtain the OLED display device.

[0036] In the present invention, the method for preparing the light management layer is preferably physical vapor deposition or chemical vapor deposition; the present invention does not have any special limitations on the processes of the physical vapor deposition and chemical vapor deposition, and the processes well-known to those skilled in the art can be used.

[0037] The present invention does not have any special limitations on the processes of the nanoimprinting and laser etching, and the processes well-known to those skilled in the art can be used.

[0038] Next, the technical solutions in the present invention will be clearly and completely described in conjunction with the embodiments in the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0039] Example 1

[0040] Provide an OLED with a packaging structure: including an OLED substrate structure and a packaging structure; the OLED substrate structure includes a substrate (made of glass, with a thickness of 0.5 μm), an anode (made of ITO, with a thickness of 100 nm), a light-emitting layer (made of PLED material, with a thickness of 200 nm), and a cathode (made of magnesium-aluminum alloy, with a thickness of 20 nm) stacked in sequence (as Figure 1 shown);

[0041] Using physical vapor deposition method, an antireflection film (made of silicon dioxide, with a thickness of 100 nm), a reflective film (made of aluminum, with a thickness of 120 nm), and a polarization film (made of iodine coated with polyvinyl alcohol, with a thickness of 20 μm) are sequentially deposited on the surface of the OLED with the packaging structure to obtain a light management layer;

[0042] Using nanoimprinting technology, a microlens array is prepared on the surface of the light management layer. The shape of the microlens array is hemispherical, the diameter of the hemisphere is 80 μm, the height is 40 μm, the arrangement is a rectangular array, the distance between adjacent two microlens arrays is 120 μm, and the material is polymethyl methacrylate to obtain an OLED display device based on the light management structure (as Figure 2 shown).

[0043] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can still be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. An OLED display device based on a light management structure, comprising an OLED having a packaging structure and a light management layer arranged on the surface of the OLED of the packaging structure, characterized in that: A microlens array is also arranged on the surface of the light management layer.

2. The OLED display device according to claim 1, wherein: The shape of the microlenses in the microlens array is hemispherical or parabolic.

3. The OLED display device according to claim 2, wherein: The diameter of the microlens is 20-200 μm, and the height is 10-100 μm.

4. The OLED display device according to claim 3, wherein: The microlenses are arranged in a rectangular array, a hexagonal array or a random array.

5. The OLED display device according to claim 4, wherein: The distance between two adjacent microlenses is 50-500 μm.

6. The OLED display device according to any one of claims 1 to 5, characterized in that: The material of the microlenses in the microlens array is optical glass or transparent polymer.

7. The OLED display device according to claim 6, wherein: The transparent polymer includes one or more of polymethyl methacrylate, polycarbonate, cycloolefin copolymer and polyvinyl butyral.

8. The OLED display device according to claim 1, wherein: The light management layer includes a multilayer optical film; The multilayer optical film includes two or more of an antireflection film, a reflective film and a polarizing film which are stacked.

9. The OLED display device according to claim 8, wherein: The material of the antireflection film is silicon dioxide and / or magnesium fluoride; The material of the reflective film is metal or metal oxide; The material of the polarizing film is polyvinyl alcohol.

10. The method for preparing an OLED display device according to any one of claims 1 to 9, characterized in that: The following steps are involved: After a light management layer is prepared on the surface of the OLED with the encapsulation structure, a microlens array is prepared on the surface of the light management layer by using nano-imprinting or laser etching technology to obtain the OLED display device.

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