Display device and method for manufacturing the same

Abstract

The present application discloses a display device and a manufacturing method thereof. The display device of the present application includes a substrate, a reflective layer, a first microcavity adjustment layer, a first semi-transparent metal layer, a second microcavity adjustment layer, and a second semi-transparent metal layer. The reflective layer is disposed on the surface of the substrate; the first microcavity adjustment layer is disposed on the side of the reflective layer away from the substrate; the first semi-transparent metal layer is disposed on the side of the first microcavity adjustment layer away from the reflective layer; the second microcavity adjustment layer is disposed on the side of the first semi-transparent metal layer away from the first microcavity adjustment layer; the second semi-transparent metal layer is disposed on the side of the second microcavity adjustment layer away from the first semi-transparent metal layer. In the present application, the first microcavity adjustment layer is provided to adjust wide-angle interference, and the second microcavity adjustment layer is provided to adjust multi-beam interference, so that wide-angle interference and multi-beam interference form constructive interference in the target spectrum, thereby optimizing the microcavity effect and improving the light extraction efficiency of the display device; in addition, the spectrum can be narrowed and the color purity can be improved.

Description

Technical Field

[0001] This application relates to the field of displays, and in particular, to a display device and a manufacturing method thereof. Background Art

[0002] In related technologies, since semiconductor display technologies such as organic light-emitting diodes and quantum dot light-emitting diodes have higher fluorescence efficiency and a wider color gamut compared to traditional display technologies, they have been pursued by people. However, the structures of existing semiconductor display devices often can only be optimized for first-order or second-order microcavities, and the effect of narrowing the emission spectrum is limited, which affects the color purity of the display device. Summary of the Invention

[0003] This application aims to solve at least one of the technical problems existing in the prior art. For this reason, this application provides a display device that can narrow the emission spectrum, thereby improving color purity and ensuring a considerable light extraction efficiency.

[0004] A display device according to an embodiment of the first aspect of this application includes a substrate; a reflective layer disposed on the surface of the substrate for reflecting light; a first microcavity adjustment layer disposed on the side of the reflective layer away from the substrate for adjusting wide-angle interference and multi-beam interference; a first semi-transparent metal layer disposed on the side of the first microcavity adjustment layer away from the reflective layer; a second microcavity adjustment layer disposed on the side of the first semi-transparent metal layer away from the first microcavity adjustment layer for adjusting multi-beam interference; and a second semi-transparent metal layer disposed on the side of the second microcavity adjustment layer away from the first semi-transparent metal layer.

[0005] The display device according to an embodiment of this application has at least the following beneficial effects: By setting the first microcavity adjustment layer to adjust wide-angle interference and the second microcavity adjustment layer to adjust multi-beam interference, constructive interference of wide-angle interference and multi-beam interference is formed in the target spectrum, thereby optimizing the microcavity effect and improving the light extraction efficiency of the display device; in addition, a higher-order microcavity (generally a third-order microcavity) will be generated between the second semi-transparent metal layer and the reflective layer, which can narrow the spectrum and improve color purity.

[0006] According to some embodiments of this application, the display device further includes a light-emitting component disposed between the first microcavity adjustment layer and the first semi-transparent metal layer for outputting the light.

[0007] According to some embodiments of the present application, the light-emitting component includes: a first transport layer disposed on a side of the first microcavity adjustment layer away from the reflective layer for injecting and transporting electrons or holes; a light-emitting layer disposed on a side of the first transport layer away from the first microcavity adjustment layer; and a second transport layer disposed on a side of the light-emitting layer away from the first transport layer for injecting and transporting electrons or holes.

[0008] According to some embodiments of the present application, the material of the light-emitting layer includes one or more of quantum dots and phosphorescent materials.

[0009] According to some embodiments of the present application, the material of the first microcavity adjustment layer and the second microcavity adjustment layer includes one or more of indium tin oxide, indium tin oxide, and indium gallium zinc oxide.

[0010] According to some embodiments of the present application, the material of the first semi-transparent metal layer and the second semi-transparent metal layer includes one or more of aluminum, silver, gold, magnesium, and copper.

[0011] A method for manufacturing a display device according to a second aspect embodiment of the present application includes: depositing a metal on a substrate surface to obtain a reflective layer; depositing a transparent electrode material on the reflective layer surface to obtain a first microcavity adjustment layer; depositing a metal material above the first microcavity adjustment layer surface to obtain a first semi-transparent metal layer; depositing a transparent electrode material on the first semi-transparent metal layer surface to obtain a second microcavity adjustment layer; and depositing a metal material on the second microcavity adjustment layer surface to obtain a second semi-transparent metal layer.

[0012] The method for manufacturing a display device according to an embodiment of the present application has at least the following beneficial effects: By manufacturing the display device through a deposition method, the steps can be simplified, the cost can be reduced, and it is convenient for large-scale application; in addition, the display device manufactured by this method has the advantages of high light extraction efficiency and high color purity.

[0013] According to some embodiments of the present application, the deposition method includes spin coating, printing, and evaporation.

[0014] Additional aspects and advantages of the present application will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The following further describes the present application with reference to the drawings and embodiments, where:

[0016] Figure 1 is a schematic structural diagram of a display device according to an embodiment of the present application;

[0017] Figure 2aSchematic diagram of the principle of the display device according to the embodiment of the present application;

[0018] Figure 2b Schematic diagram of the principle of the display device according to the embodiment of the present application;

[0019] Figure 3a Schematic diagram of the effect of the weak microcavity;

[0020] Figure 3b Schematic diagram of the effect of the single microcavity;

[0021] Figure 3c Schematic diagram of the effect of the multiple microcavities according to the embodiment of the present application;

[0022] Figure 4 Schematic flow chart of the preparation method of the display device according to the embodiment of the present application.

[0023] Reference numerals:

[0024] Substrate 100, reflective layer 200, first microcavity adjustment layer 300, first semi-transparent metal layer 400, second microcavity adjustment layer 500, second semi-transparent metal layer 600, light-emitting component 700, first transmission layer 710, light-emitting layer 720, second transmission layer 730. Detailed description of the specific embodiment

[0025] The embodiments of the present application will be described in detail below. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and should not be construed as a limitation to the present application.

[0026] In the description of the present application, it should be understood that the orientation or positional relationship indicated by terms such as up, down, front, back, left, right, etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0027] In the description of the present application, the meaning of several is more than one, the meaning of multiple is more than two, greater than, less than, exceeding, etc. are understood as not including the number itself, and above, below, within, etc. are understood as including the number itself. If the first and second are described only for the purpose of distinguishing technical features, they should not be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0028] In the description of the present application, unless otherwise clearly defined, terms such as "arrangement", "installation", "connection", etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present application in combination with the specific content of the technical solution.

[0029] In the description of the present application, the description referring to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0030] Next, refer to Figures 1 to 3c to describe a display device according to an embodiment of the present application.

[0031] As Figures 1 to 3c shown, a display device according to an embodiment of the present application includes a substrate 100, a reflective layer 200, a first microcavity adjustment layer 300, a first semi-transparent metal layer 400, a second microcavity adjustment layer 500, and a second semi-transparent metal layer 600.

[0032] The reflective layer 200 is disposed on the surface of the substrate 100 and is used for reflecting light; the first microcavity adjustment layer 300 is disposed on the side of the reflective layer 200 away from the substrate 100 and is used for adjusting wide-angle interference and multi-beam interference; the first semi-transparent metal layer 400 is disposed on the side of the first microcavity adjustment layer 300 away from the reflective layer 200; the second microcavity adjustment layer 500 is disposed on the side of the first semi-transparent metal layer 400 away from the first microcavity adjustment layer 300 and is used for adjusting multi-beam interference; the second semi-transparent metal layer 600 is disposed on the side of the second microcavity adjustment layer 500 away from the first semi-transparent metal layer 400.

[0033] For the display device according to an embodiment of the present application, by setting the first microcavity adjustment layer 300 to adjust wide-angle interference and setting the second microcavity adjustment layer 500 to adjust multi-beam interference, so that wide-angle interference and multi-beam form constructive interference in the target spectrum, thereby optimizing the microcavity effect and improving the light extraction efficiency of the display device; in addition, a high-order microcavity (generally a third-order microcavity) will be generated between the second semi-transparent metal layer 600 and the reflective layer 200, which can narrow the spectrum and improve color purity.

[0034] For example, as Figures 1 to 3cAs shown, a reflective layer 200 is sequentially deposited on the surface of the substrate 100. The reflective layer 200 is a total reflection metal layer, which can reflect all the light beams, improving the light utilization rate. A first microcavity adjustment layer 300 is disposed on the side of the reflective layer 200 away from the substrate 100. The first microcavity adjustment layer 300 can adjust wide-angle interference and multi-beam interference, mainly adjusting wide-angle interference, enhancing the microcavity effect, and at the same time can also filter the light beam. A first semi-transparent metal layer 400 is disposed on the side of the first microcavity adjustment layer 300 away from the reflective layer 200. The first semi-transparent metal layer 400 forms a second-order microcavity with the reflective layer 200, as Figure 2a shown, which can realize spectral narrowing, thereby improving the light extraction efficiency of the display device. However, the display devices in the related art often can only optimize the second-order microcavity, and the effect of spectral narrowing is limited. Therefore, in the embodiments of the present application, a second microcavity adjustment layer 500 and a second semi-transparent metal layer 600 are sequentially disposed on the surface of the first semi-transparent metal layer 400. As Figure 2b shown, a first-order microcavity is formed between the second semi-transparent metal layer 600 and the first semi-transparent metal layer 400, and a third-order microcavity is formed between the second semi-transparent metal layer 600 and the reflective layer 200. The third-order microcavity has a stronger spectral narrowing effect, which can further narrow the spectrum and improve the color purity of the display device.

[0035] The settings of the first microcavity adjustment layer 300 and the second microcavity adjustment layer 500 can optimize the microcavity structure. Among them, the first microcavity adjustment layer 300 can adjust wide-angle interference, and the second microcavity adjustment layer 500 can adjust multi-beam interference. In the light-emitting device, by selecting appropriate thickness values of the first microcavity adjustment layer 300 and the second microcavity adjustment layer 500, wide-angle interference and multi-beam interference can be adjusted so that constructive interference can be formed in the target spectrum, thereby achieving the best light extraction efficiency and color purity.

[0036] According to Figures 3a to 3c it can be found that the effect of spectral narrowing is significantly improved after using multiple microcavities. As Figure 3a shown, in the case of a weak microcavity, the spectral narrowing effect is poor, and the corresponding light extraction efficiency is 6.9% (the light extraction efficiency can be obtained according to the optical simulation software). As Figure 3b shown, when the single microcavity is enhanced, compared with the weak microcavity, the spectral narrowing effect is improved, and the corresponding light extraction efficiency is increased to 18.5%. The display device proposed in the present application uses multiple microcavities, as Figure 3c shown, further narrowing the spectrum, and at the same time can improve the light extraction efficiency, and the corresponding light extraction efficiency is 21.8%.

[0037] In some specific embodiments of the present application, as Figure 1As shown, the display device further includes a light-emitting component 700, which is disposed between the first microcavity adjustment layer 300 and the first semi-transparent metal layer 400 and is used to output light. For example, the display device further includes a light-emitting component 700, which is disposed on the side of the first microcavity adjustment layer 300 close to the first semi-transparent metal layer 400. The light-emitting component 700 can emit light of different colors according to different light-emitting materials. For light of different colors and different wavelengths, it is necessary to correspondingly optimize the thicknesses of the first microcavity adjustment layer 300, the first semi-transparent metal layer 400, the second microcavity adjustment layer 500, and the second semi-transparent metal layer 600, so as to improve the luminous efficiency while enhancing the color rendering degree.

[0038] In some specific embodiments of the present application, as Figure 1 shown, the light-emitting component 700 includes a first transport layer 710, a light-emitting layer 720, and a second transport layer 730. The first transport layer 710 is disposed on the side of the first microcavity adjustment layer 300 away from the reflective layer 200 and is used to inject and transport electrons or holes; the light-emitting layer 720 is disposed on the side of the first transport layer 710 away from the first microcavity adjustment layer 300; the second transport layer 730 is disposed on the side of the light-emitting layer 720 away from the first transport layer 710 and is used to inject and transport electrons or holes. For example, the light-emitting component 700 is composed of a first transport layer 710, a light-emitting layer 720, and a second transport layer 730. The light-emitting layer 720 is disposed in the middle and is used to output light. The first transport layer 710 is disposed on the side of the first microcavity adjustment layer 300 away from the reflective layer 200 and is used to transport electrons. Among them, the material of the first transport layer 710 can be selected as ZnMgO. The transport layer disposed on the side of the light-emitting layer 720 away from the first transport layer 710, the second transport layer 730 is used to inject and transport holes. Among them, the material of the second transport layer 730 can be CBP, MoO3, HATCN, etc., and the specific material can be selected according to requirements.

[0039] In some specific embodiments of the present application, the material of the light-emitting layer 720 includes one or more of quantum dots and phosphorescent materials. For example, the material of the light-emitting layer 720 can be selected as quantum dots, phosphorescent materials, organic light-emitting materials, etc. Among them, quantum dots have the characteristics of long fluorescence lifetime and high luminous efficiency, and can improve the display effect of the display device.

[0040] In some specific embodiments of the present application, the materials of the first microcavity adjustment layer 300 and the second microcavity adjustment layer 500 include one or more of indium tin oxide, indium tin oxide, and indium gallium zinc oxide.

[0041] In some specific embodiments of the present application, the materials of the first semi-transparent metal layer 400 and the second semi-transparent metal layer 600 include one or more of aluminum, silver, gold, magnesium, and copper.

[0042] In some embodiments, the embodiments of the present application further provide a method for manufacturing a display device.

[0043] As Figure 4 shown, the method for manufacturing a display device according to the embodiments of the present application includes:

[0044] Step S100: Depositing a metal on the surface of the substrate 100 to obtain a reflective layer 200;

[0045] Step S200: Depositing a transparent electrode material on the surface of the reflective layer 200 to obtain a first microcavity adjustment layer 300;

[0046] Step S300: Depositing a metal material on the surface of the first microcavity adjustment layer 300 to obtain a first semi-transparent metal layer 400;

[0047] Step S400: Depositing a transparent electrode material on the surface of the first semi-transparent metal layer 400 to obtain a second microcavity adjustment layer 500;

[0048] Step S500: Depositing a metal material on the surface of the second microcavity adjustment layer 500 to obtain a second semi-transparent metal layer 600.

[0049] According to the method for manufacturing a display device of the embodiments of the present application, the display device is manufactured by deposition, which can simplify the steps, reduce the cost, and facilitate large-scale application; in addition, the display device prepared by this method has the advantages of high light extraction efficiency and high color purity.

[0050] Specifically, the substrate 100 is selected as a glass substrate, and silver is deposited on the surface of the glass substrate by thermal evaporation technology as the reflective layer 200. Aluminum, gold, etc. can also be selected as the material of the reflective layer 200. IZO is deposited on the surface of the reflective layer 200 material by magnetron sputtering technology as the first microcavity adjustment layer 300. Among them, the material of the first microcavity adjustment layer 300 can also be selected as ITO, IGZO, etc. Then, ZnMgO is deposited on the surface of the first microcavity adjustment layer 300 by spin coating process as the first transport layer 710, quantum dots are deposited as the light-emitting layer 720, and CBP, MoO3, and HATCN are deposited as the second transport layer 730. Then, an extremely thin layer of silver is deposited on the surface of the second transport layer 730 by thermal evaporation technology as the first semi-transparent metal layer 400 to enhance the microcavity effect, and IZO is sputtered on the surface of the first semi-transparent metal layer 400 as the second microcavity adjustment layer 500. In some other embodiments, other transparent conductive materials can also be thermally evaporated as the microcavity adjustment layer. Finally, Al, Ag, etc. are thermally evaporated on the second microcavity adjustment layer 500 as the second semi-transparent metal layer 600, thus completing the manufacture of the display device.

[0051] In some specific embodiments of the present application, the deposition methods include spin coating, printing, and evaporation.

[0052] The embodiments of the present application have been described in detail above with reference to the accompanying drawings. However, the present application is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present application within the scope of knowledge possessed by those of ordinary skill in the art. In addition, the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

Claims

1. A display device, characterized in that, Comprising: Substrate; Reflection layer, which is disposed on the surface of the substrate and is used for reflecting light; First microcavity adjustment layer, which is disposed on the side of the reflection layer away from the substrate and is used for adjusting wide-angle interference and multi-beam interference; First semi-transparent metal layer, which is disposed on the side of the first microcavity adjustment layer away from the reflection layer; Second microcavity adjustment layer, which is disposed on the side of the first semi-transparent metal layer away from the first microcavity adjustment layer and is used for adjusting multi-beam interference. By adjusting wide-angle interference and multi-beam interference through the first microcavity adjustment layer and the second microcavity adjustment layer, constructive interference is formed in the target spectrum for wide-angle interference and multi-beam interference, so as to optimize the microcavity effect and improve the light extraction efficiency of the display device. The materials of the first microcavity adjustment layer and the second microcavity adjustment layer include one or more of indium tin oxide, indium tin oxide, and indium gallium zinc oxide; Second semi-transparent metal layer, which is disposed on the side of the second microcavity adjustment layer away from the first semi-transparent metal layer; Light-emitting component, which is disposed between the first microcavity adjustment layer and the first semi-transparent metal layer and is used for outputting the light. The light-emitting component emits different colors of light according to different luminescent materials. The light-emitting component includes a light-emitting layer to emit light of a single color; Wherein, the thicknesses of the first microcavity adjustment layer, the first semi-transparent metal layer, the second microcavity adjustment layer, and the second semi-transparent metal layer are optimized to form multiple microcavities with corresponding wavelengths for the different colors of light emitted by the light-emitting component, and according to the multiple microcavities emitting light of a single color and wavelength, the color purity is enhanced while the luminous efficiency is improved.

2. The display device according to claim 1, wherein The light-emitting component includes: First transport layer, which is disposed on the side of the first microcavity adjustment layer away from the reflection layer and is used for injecting and transporting electrons or holes; Light-emitting layer, which is disposed on the side of the first transport layer away from the first microcavity adjustment layer; Second transport layer, which is disposed on the side of the light-emitting layer away from the first transport layer and is used for injecting and transporting electrons or holes.

3. The display device according to claim 2, characterized in that, The material of the light-emitting layer includes one or more of quantum dots and phosphorescent materials.

4. The display device according to claim 1, characterized in that, The materials of the first semi-transparent metal layer and the second semi-transparent metal layer include one or more of aluminum, silver, gold, magnesium, and copper.

5. A method for manufacturing a display device, characterized in that, For preparing the display device according to any one of claims 1 to 4, comprising: Depositing metal on the surface of the substrate to obtain a reflection layer; Depositing a transparent electrode material on the surface of the reflection layer to obtain a first microcavity adjustment layer; Depositing a metal material above the surface of the first microcavity adjustment layer to obtain a first semi-transparent metal layer; Deposit a transparent electrode material on the surface of the first semi-transparent metal layer to obtain a second microcavity adjustment layer. Adjust wide-angle interference and multi-beam interference through the first microcavity adjustment layer and the second microcavity adjustment layer, so that wide-angle interference and multi-beam form constructive interference in the target spectrum to optimize the microcavity effect and improve the light extraction efficiency of the display device. The materials of the first microcavity adjustment layer and the second microcavity adjustment layer include one or more of indium tin oxide, indium tin oxide, and indium gallium zinc oxide; Deposit a metal material on the surface of the second microcavity adjustment layer to obtain a second semi-transparent metal layer; Among them, the display device further includes a light-emitting component, which is disposed between the first microcavity adjustment layer and the first semi-transparent metal layer and is used to output the light. The light-emitting component emits different colors of light according to different light-emitting materials. The light-emitting component includes a light-emitting layer to emit light of a single color; optimize the thicknesses of the first microcavity adjustment layer, the first semi-transparent metal layer, the second microcavity adjustment layer, and the second semi-transparent metal layer to form multiple microcavities with corresponding wavelengths for the different colors of light emitted by the light-emitting component, and emit light of a single color and wavelength according to the multiple microcavities, improving the luminous efficiency while enhancing the color purity.

6. The manufacturing method of a display device according to claim 5, characterized in that, The deposition methods include spin coating, printing, and evaporation.

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