An organic light emitting display device and a method of fabricating the same

Abstract

The application discloses an organic light emitting display device and a preparation method thereof, and relates to the technical field of display.The application comprises a substrate, a black matrix layer formed on the substrate, and an opening corresponding to a sub-pixel of the organic light emitting display device on the black matrix layer; the sub-pixel comprises a red sub-pixel, a green sub-pixel and a blue sub-pixel; a red quantum dot layer is formed on the opening corresponding to the red sub-pixel; a green quantum dot layer is formed on the opening corresponding to the green sub-pixel; a transparent layer is formed on the opening corresponding to the blue sub-pixel; a blue light transmission and red and green reflection layer is formed on the side of the black matrix layer away from the substrate; and a laminated blue light organic light emitting device layer is formed on the side of the blue light transmission and red and green reflection layer away from the black matrix layer.The laminated blue light organic light emitting device layer is a laminated blue light OLED, and the blue light transmission and red and green reflection layer is arranged between the laminated blue light OLED and the quantum dot layer, so that the color purity and the color gamut of the light emitting material are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display devices, in particular to an organic light-emitting display device and a preparation method thereof. BACKGROUND

[0002] QDCF (Quantum dot color filter) liquid crystal panel preparation has been realized. Since quantum dots are introduced into the pixels, the architecture of the LCD (Liquid Crystal Display) is greatly changed, and the preparation of the built-in metal wire grid polarizer is required. The preparation method of nanoimprinting can realize the preparation, but the yield problem of large-size nanoimprinting also exists, and there is no mature equipment for the preparation of automatic large-size metal wire grid polarizer. The liquid crystal light valve also needs to solve a series of optical problems brought by replacing the traditional polarizer with the metal wire grid polarizer.

[0003] At the same time, the OLED (Organic Light-Emitting Diode) prepared at present has the problems of low color gamut and different lifetimes of different organic OLED pixels due to different light-emitting materials. In addition, when preparing red, green and blue three primary color light-emitting centers, it is necessary to adjust the color mixing ratio of the three colors to produce true colors, and the color purity requirement is high, and the light-emitting efficiency is low.

[0004] In summary, the color gamut of the OLED prepared at present is low. SUMMARY

[0005] The present application provides an organic light-emitting display device and a preparation method thereof, to solve the problem of low color gamut of the OLED prepared in the prior art.

[0006] In a first aspect, the present application provides a preparation method of an organic light-emitting display device, which comprises:

[0007] forming a black matrix layer on a substrate and forming an opening corresponding to a sub-pixel of the organic light-emitting display device on the black matrix layer by a patterning process, the sub-pixel including a red sub-pixel, a green sub-pixel and a blue sub-pixel;

[0008] filling a quantum dot material of a corresponding color in the opening corresponding to the red sub-pixel and the green sub-pixel to form a quantum dot layer of the corresponding color, and filling a transparent material in the opening corresponding to the blue sub-pixel to form a transparent layer, wherein the material of the quantum dot layer is cadmium-free quantum dot material;

[0009] forming a blue-transmitting red-green reflecting layer on the black matrix layer;

[0010] Form a stacked blue light organic light-emitting device layer on the blue light transmitting and red and green light reflecting layer, wherein the light emitting direction of the stacked blue light organic light-emitting device layer is towards the substrate.

[0011] The method provides a single-color OLED combined with a QDCF, and mature single-color OLED preparation technology is used to prepare a QD-OLED (quantum dot-organic electroluminescent device), so that a series of pixel life and display burn-in problems caused by different color OLED pixel efficiencies are solved, the color gamut of the OLED is improved under the condition of ensuring the advantages of the OLED display, the display color gamut of the OLED is improved, and meanwhile, a metal wire grid polarizer does not need to be used in the preparation process, so that a main influencing factor in the preparation process of the QDCF liquid crystal display device, i.e., the equipment and technical implementation challenge caused by the high-precision large-area nano-imprint wire grid preparation technology, is solved, the light emitting direction of the stacked blue light organic light-emitting device layer is towards the substrate, the preparation of the bottom light-emitting stacked blue light device is performed, the pixel light mixing problem caused by low alignment accuracy of the QD substrate and the OLED substrate of the QD-OLED is solved, the problem that the OLED using top-emitting blue light generates an optical microcavity effect in the OLED structure itself is overcome, and in addition, the QD and the OLED do not need to be aligned in the embodiment of the application, and the blue light transmitting and red and green light reflecting layer is arranged between the QD and the OLED, so that the color mixing problem caused by the alignment accuracy in the QD and OLED two-substrate cell preparation process is overcome, the color purity of the light-emitting material and the color gamut of the OLED are improved.

[0012] Further, the filling of the corresponding color quantum dot material in the opening corresponding to the red sub-pixel and the green sub-pixel and the formation of the corresponding color quantum dot layer comprises:

[0013] filling the corresponding color solvent type quantum dot material in the opening corresponding to the red sub-pixel and the green sub-pixel;

[0014] evaporating the corresponding color solvent type quantum dot material filled in the opening corresponding to the red sub-pixel and the green sub-pixel by preheating to pre-cure the red solvent type quantum dot material filled in the opening corresponding to the red sub-pixel and the green solvent type quantum dot material filled in the opening corresponding to the green sub-pixel;

[0015] heating and curing the red solvent type quantum dot material filled in the opening corresponding to the red sub-pixel and the green solvent type quantum dot material filled in the opening corresponding to the green sub-pixel by using a heating and curing process to form a red quantum dot layer and a green quantum dot layer.

[0016] The method, when filling the solvent type quantum dot material of corresponding color in the opening corresponding to the red sub-pixel and the green sub-pixel, forms the red quantum dot layer and the green quantum dot layer through the preheating method to remove the solvent and then through the heating curing process.

[0017] Further, the filling the solvent type quantum dot material of corresponding color in the opening corresponding to the red sub-pixel and the green sub-pixel comprises:

[0018] The method fills the solvent type red quantum dot material and the solvent type green quantum dot material through the inkjet printing mode.

[0019] The method fills the solvent type red quantum dot material and the solvent type green quantum dot material through the inkjet printing mode.

[0020] Further, the filling the solvent type quantum dot material of corresponding color in the opening corresponding to the red sub-pixel and the green sub-pixel and forming the quantum dot layer of corresponding color comprises:

[0021] The method fills the solvent type red quantum dot material and the solvent type green quantum dot material through the inkjet printing mode.

[0022] The method fills the solvent type red quantum dot material and the solvent type green quantum dot material through the inkjet printing mode.

[0023] The method, when filling the solvent type quantum dot material of corresponding color in the opening corresponding to the red sub-pixel and the green sub-pixel, forms the red quantum dot layer and the green quantum dot layer through the preheating method to remove the solvent and then through the heating curing process.

[0024] Further, the filling the solvent type quantum dot material of corresponding color in the opening corresponding to the red sub-pixel and the green sub-pixel comprises:

[0025] The method fills the solvent type red quantum dot material and the solvent type green quantum dot material through the inkjet printing mode.

[0026] The method fills the solvent type red quantum dot material and the solvent type green quantum dot material through the inkjet printing mode.

[0027] Further, the forming the laminated blue light organic light emitting device layer on the blue light reflection red and green light layer comprises:

[0028] Forming the laminated blue light organic light-emitting device layer on the blue light transparent and red and green light reflecting layer by evaporation.

[0029] The method for preparing the laminated blue light organic light-emitting device layer by evaporation is mature in preparation technology.

[0030] Further, the cadmium-free quantum dot material is any one of indium phosphide, perovskite, carbon quantum dot, and sulfur quantum dot.

[0031] Further, the blue light transparent and red and green light reflecting layer is a 6-15 period titanium oxide layer or a 6-15 period silicon oxide layer.

[0032] The method for preparing the laminated blue light organic light-emitting device layer by evaporation of the 6-15 period titanium oxide layer or the 6-15 period silicon oxide layer can make the blue light transparent and red and green light reflecting layer achieve the effect of blue light transmission and red and green light reflection by adjusting the thickness of different layers, and the prepared multi-period blue light transparent and red and green light reflecting layer has a certain protective effect on the quantum dots.

[0033] Further, the period of the blue light transparent and red and green light reflecting layer is 8-12 periods.

[0034] Further, the thickness of the red quantum dot layer and the green quantum dot layer is 5-10 μm.

[0035] Further, the pixel structure in the quantum dot layer is the same in size as the pixel control unit of a TFT (Thin Film Transistor) in the laminated blue light organic light-emitting device layer.

[0036] In a second aspect, the present application provides an organic light-emitting display device prepared by any one of the methods of the first aspect, and the display device comprises:

[0037] a substrate;

[0038] a black matrix layer formed on the substrate, and having openings corresponding to sub-pixels of the organic light-emitting display device one by one, the sub-pixels including a red sub-pixel, a green sub-pixel, and a blue sub-pixel, a red quantum dot layer formed on the opening corresponding to the red sub-pixel, a green quantum dot layer formed on the opening corresponding to the green sub-pixel, and a transparent layer formed on the opening corresponding to the blue sub-pixel.

[0039] a blue light transparent and red and green light reflecting layer formed on the side of the black matrix layer away from the substrate;

[0040] a laminated blue light organic light-emitting device layer formed on the side of the blue light transparent and red and green light reflecting layer away from the black matrix layer.

[0041] The display device, the light-emitting direction of the stacked blue light organic light-emitting device layer is towards the substrate, since the bottom light-emitting stacked blue light device is adopted, the pixel mixed light problem caused by the low alignment accuracy of the QD substrate and the OLED substrate of the QD-OLED can be solved, the problem of the optical microcavity effect in the OLED structure caused by the top-emitting blue light OLED is also overcome, in addition, the blue-transmitting red-green reflecting layer is arranged between the QD and the OLED, the color mixing problem caused by the alignment accuracy in the QD and OLED two-substrate cell preparation process is overcome, the color purity of the light-emitting material and the color gamut of the OLED are improved.

[0042] Further, the material of the red quantum dot layer and the green quantum dot layer is cadmium-free quantum dot material. BRIEF DESCRIPTION OF DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0044] Figure 1 A preparation method of an organic light-emitting device provided by the embodiment of the present application is shown in the schematic diagram.

[0045] Figure 2 A QDCF structure provided by the embodiment of the present application is shown in the schematic diagram.

[0046] Figure 3 A method of thermally curing the preparation of a quantum dot layer provided by the embodiment of the present application is shown in the schematic diagram.

[0047] Figure 4 A schematic diagram of inkjet printing preparation of a quantum dot layer provided by the embodiment of the present application is shown in the schematic diagram.

[0048] Figure 5 A schematic diagram of inkjet printing preparation of a quantum dot layer provided by the embodiment of the present application is shown in the schematic diagram.

[0049] Figure 6 A schematic diagram of an organic light-emitting display device provided by the embodiment of the present application is shown in the schematic diagram.

[0050] FIG.

[0051] 1-substrate; 2-black matrix layer; 201-transparent layer; 202-red quantum dot layer; 203-green quantum dot layer; 3-blue-transmitting red-green reflecting layer; 4-stacked blue light organic light-emitting device layer. DETAILED DESCRIPTION

[0052] In order to make the objects, technical solutions and advantages of the present application clearer, the following further describes the present application in detail with reference to the drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0053] The following explains some words appearing in the text:

[0054] The term "and / or" in the embodiments of the present application describes the association relationship of associated objects, which means that there can be three relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. The character " / " generally represents an "or" relationship between the associated objects before and after it.

[0055] The application scenarios described in the embodiments of the present application are used to more clearly illustrate the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided by the embodiments of the present application. Those skilled in the art can know that, with the appearance of new application scenarios, the technical solutions provided by the embodiments of the present application are also applicable to similar technical problems. In the description of the present application, unless otherwise specified, "a plurality of" means two or more.

[0056] The structure of the LCD is to place a liquid crystal cell between two parallel glass substrates, set TFT (Thin Film Transistor, thin film transistor) on the lower substrate glass, set color filter on the upper substrate glass, and control the rotation direction of the liquid crystal molecules through the signal and voltage change on the TFT, so as to control the polarization light emission of each pixel point and achieve the display purpose.

[0057] Now, the LCD has replaced the CRT (Cathode Ray Tube, cathode ray tube) as the mainstream, and the price has also decreased a lot, and the preparation of the metal wire grid polarizer has been fully carried out. In the preparation process, the metal wire grid has a depth-width ratio of more than 2:1, and the problems occurring in the demolding process will directly affect the quality of the subsequent preparation of the metal wire grid and the quality of the next time the working template is pressed. Especially in the case of large size area, the preparation yield of the entire size of the liquid crystal panel needs to be improved through process and material.

[0058] The method for reducing the reflectivity of the metal nanometer grating is mainly applied to non-spectroscopic nanometer metal wire grid, such as metal wire grid polarizer, especially in the application of quantum dot color filter in the liquid crystal panel, the reflectivity of the metal wire grid polarizer is reduced.

[0059] In the application of metal wire grid polarizers, since the grid period is much smaller than the wavelength of light, TM (Transverse Magnetic) light passes through the wire grid polarizer, while TE (Transverse Electric) light is not absorbed but reflected by the metal wire grid polarizer. Reducing the angle between the incident light and the normal of the wire grid plane can effectively improve the extinction ratio of the wire grid. However, in QDCF liquid crystal modules, in the TFT-OFF state, the polarization direction of the light reaching the wire grid polarizer after passing through the liquid crystal layer is the same as the wire grid direction, which is the TE direction, and has a high reflectivity. After reflection, the light is reflected in the liquid crystal cell, resulting in light leakage. Under very low luminous flux conditions, the quantum dots in QDCF pixels have a high light conversion rate, resulting in higher dark field brightness compared to other display methods, but reduced contrast.

[0060] To improve the contrast of a QDCF liquid crystal module, the only solution is to reduce the reflectivity of the metal wire grid and increase the absorption rate of blue light that does not pass through the metal wire grid. Similarly, in other applications of metal wire grids, to reduce the impact of light reflection from the metal wire grid on photoelectric conversion and improve the application efficiency of the optical metal nanowire grid, it is also necessary to prepare an anti-reflection layer.

[0061] QDCF LCD panel fabrication has been achieved. Due to the introduction of quantum dots into pixels, the LCD architecture has been greatly changed, requiring the fabrication of built-in metal wire grid polarizers. Nanoimprinting can be used to fabricate them, but large-size nanoimprinting also has yield problems. Furthermore, there is no mature equipment for the fabrication of automated large-size metal wire grid polarizers. Liquid crystal light valves also need to solve a series of optical problems brought about by replacing traditional polarizers with metal wire grid polarizers.

[0062] Therefore, this invention provides a display device that combines monochrome OLED with QDCF, solving a series of pixel lifespan and burn-in problems caused by the different pixel efficiencies of OLEDs of different colors, improving the color gamut of OLEDs, and at the same time solving a major influencing factor in the fabrication process of QDCF liquid crystal display devices: the equipment and technical implementation challenges brought about by high-precision large-area nanoimprinted grid fabrication technology.

[0063] In view of the above scenarios, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0064] like Figure 1 As shown, a method for fabricating an organic light-emitting display device according to an embodiment of the present invention specifically includes the following steps:

[0065] Step 100: forming a black matrix layer on a substrate substrate, and forming openings corresponding to sub-pixels of an organic light-emitting display device on the black matrix layer by a patterning process, the sub-pixels including red sub-pixels, green sub-pixels and blue sub-pixels;

[0066] Step 101: filling a corresponding color of quantum dot material in the openings corresponding to the red sub-pixels and the green sub-pixels to form a corresponding color of quantum dot layer, and filling a transparent material in the opening corresponding to the blue sub-pixel to form a transparent layer, wherein the material of the quantum dot layer is cadmium-free quantum dot material;

[0067] Step 102: forming a blue-transmitting red-green-reflecting layer on the black matrix layer;

[0068] Step 103: forming a stacked blue light organic light-emitting device layer on the blue-transmitting red-green-reflecting layer, wherein the light-emitting direction of the stacked blue light organic light-emitting device layer is towards the substrate substrate.

[0069] By the above scheme, a display device combining single-color OLED and QDCF is provided, which uses mature single-color OLED preparation technology to prepare QD-OLED (quantum dot-organic electroluminescent device), solves a series of pixel life and display burn-in problems caused by different pixel efficiencies of different colors of OLEDs, improves the color gamut of OLEDs under the condition of ensuring the advantages of OLED display, improves the display color gamut of OLEDs; meanwhile, metal wire grid polarizing plates are not needed in the preparation process, solving a major influencing factor in the preparation process of QDCF liquid crystal display device: the equipment and technical implementation challenges caused by high-precision large-area nano-imprint wire grid preparation technology; and the light-emitting direction of the stacked blue light organic light-emitting device layer is towards the substrate substrate, by preparing a bottom-emitting stacked blue light device, solving the pixel light mixing problem caused by low alignment accuracy of QD substrate and OLED substrate of QD-OLED, overcoming the problem of optical microcavity effect caused by the OLED using top-emitting blue light, in addition, the QD and OLED do not need to be aligned in the embodiment, overcoming the color mixing problem caused by alignment accuracy in the QD and OLED two-layer substrate cell preparation process, and the blue-transmitting red-green-reflecting layer is arranged between the QD and the OLED, improving the color purity of the light-emitting material and the color gamut of the OLED.

[0070] Due to the high toxicity of cadmium, air and food contaminated by cadmium are seriously harmful to the human body, and are slowly metabolized in the human body. Therefore, the material used to prepare the quantum dot layer in the embodiment is cadmium-free quantum dot material, which can reduce the harm to the human body in the preparation process.

[0071] Optionally, the cadmium-free quantum dot material is any one of indium phosphide (InP), perovskite, carbon quantum dot, and sulfur quantum dot.

[0072] It should be noted that the types of cadmium-free quantum dot materials listed in the embodiments of the present application are only illustrative, and any cadmium-free quantum dot luminescent material is applicable to the embodiments of the present application.

[0073] As shown in FIG. 1, the organic display device includes a substrate 1, a black matrix layer 2, a transparent layer 201, a red quantum dot layer 202, and a green quantum dot layer 203. Figure 2 As shown in FIG. 2, the QDCF part of the organic display device in the embodiment of the present application includes a substrate 1, a black matrix layer 2, a transparent layer 201, a red quantum dot layer 202, and a green quantum dot layer 203.

[0074] Preparation method one: prepared by thermal curing.

[0075] Specifically, the corresponding color of the solvent type quantum dot material is filled in the opening corresponding to the red sub-pixel and the green sub-pixel; the corresponding color of the solvent type quantum dot material filled in the opening corresponding to the red sub-pixel and the green sub-pixel is evaporated by preheating to pre-cure the red solvent type quantum dot material filled in the opening corresponding to the red sub-pixel and the green solvent type quantum dot material filled in the opening corresponding to the green sub-pixel; and the red solvent type quantum dot material filled in the opening corresponding to the red sub-pixel and the green solvent type quantum dot material filled in the opening corresponding to the green sub-pixel are heated and cured to form the red quantum dot layer and the green quantum dot layer.

[0076] As shown in FIG. 3, the BM substrate is used as the substrate, the black matrix layer is formed on the BM substrate, the solvent type red quantum dot material is filled in the opening corresponding to the red sub-pixel on the black matrix layer by inkjet printing, and the solvent type green quantum dot material is filled in the opening corresponding to the green sub-pixel. Figure 3 Optionally, the corresponding color of the solvent type quantum dot material is filled in the opening corresponding to the red sub-pixel and the green sub-pixel by inkjet printing, as shown in FIG. 4.

[0077] Figure 4 Preparation method two: prepared by ultraviolet curing, also known as UV curing (Ultraviolet rays, ultraviolet rays).

[0078] Preparation method two: prepared by ultraviolet curing, also known as UV curing (Ultraviolet rays, ultraviolet rays).

[0079] ​Specifically, the solvent-free quantum dot material of corresponding color is filled in the opening corresponding to the red sub-pixel and the green sub-pixel; the solvent-free quantum dot material filled in the opening corresponding to the red sub-pixel and the solvent-free quantum dot material filled in the opening corresponding to the green sub-pixel are subjected to ultraviolet light curing by adopting the ultraviolet light curing process to form the red quantum dot layer and the green quantum dot layer.

[0080] As shown in Figure 5 , wherein the BM substrate is used as the substrate, the black matrix layer is formed on the BM substrate, the solvent-free red quantum dot material is filled in the opening corresponding to the red sub-pixel on the black matrix layer by the inkjet printing, and the solvent-free green quantum dot material is filled in the opening corresponding to the green sub-pixel; then the quantum dot pixel layer is formed by UV curing.

[0081] Optionally, the solvent-free quantum dot material of corresponding color is filled in the opening corresponding to the red sub-pixel and the green sub-pixel by the inkjet printing.

[0082] Optionally, the blue-transmitting and red-green-reflection layer is a titanium oxide layer or a silicon oxide layer with 6-15 periods, and preferably 8-12 periods.

[0083] Specifically, the blue-transmitting and red-green-reflection layer is prepared on the prepared black matrix layer by evaporation, and specifically, the evaporation is performed on the red quantum dot layer, the green quantum dot layer and the transparent layer by adopting the titanium oxide or the silicon oxide layer with 6-15 periods to prepare, and the characteristics of the blue-transmitting and red-green-reflection layer are met by adjusting the thicknesses of different layers to make the blue light transmit and the red and green light reflect, and the prepared multi-period blue-transmitting and red-green-reflection layer has a certain protection effect on the quantum dots.

[0084] Optionally, the stacked blue light organic light emitting device layer is formed on the blue-transmitting and red-green-reflection layer by evaporation, and the preparation process is mature.

[0085] The stacked blue light organic light emitting device layer includes ITO (Indium tin oxide), TFT, Bank, cathode, etc. Specifically, the ITO plating layer, the TFT preparation and the Bank preparation are performed on the blue-transmitting and red-green-reflection layer.

[0086] Optionally, the thicknesses of the red quantum dot layer and the green quantum dot layer are 5-10 pm.

[0087] Optionally, the pixel structure in the quantum dot layer is the same as the pixel control unit size of the TFT in the stacked blue light organic light emitting device layer.

[0088] Optionally, a blue monochromatic AMOLED (Active-matrix organic light emitting diode) + red-green photoluminescence QDCF quantum dot pixel conversion technology is adopted to realize the display of the QDCF-OLED, wherein the blue monochromatic AMOLED is an organic light emitting display device layer, and the red-green photoluminescence QDCF includes a red quantum dot layer, a green quantum dot layer and a transparent layer.

[0089] The AMOLED screen has three layers, the AMOLED screen, the Touch Screen Panel and the outer protective glass. The basis of the AMOLED is an organic light emitter. Thousands of light sources capable of emitting only one of the three colors of red, green or blue are arranged on the substrate of the screen in a specific form. The light emitters emit red, green or blue when a voltage is applied. The change of the voltage also needs to rely on the TFT. After the proportion of the three primary colors is adjusted, various colors can be emitted.

[0090] In the embodiment of the present application, by adopting the display device combining the monochromatic OLED and the QDCF, a series of pixel life and display burn-in problems caused by different color OLED pixel efficiencies are solved, the display color gamut of the OLED is improved, and meanwhile, a main influencing factor in the preparation process of the QDCF liquid crystal display device, i.e., the equipment and technical implementation challenge caused by the high-precision large-area nano-imprint wire grid preparation technology, is solved. Relying on the blue monochromatic AMOLED + red-green quantum dot QDCF color conversion technology, the monochromatic OLED blue light is used as a backlight source, the QDCF red-green quantum dot pixels convert the blue light into red-green fluorescence respectively, the independence of each primary color spectrum is improved, and the color gamut of the prepared organic light emitting display device will be much higher than the OLED display color gamut.

[0091] As shown in Figure 6 The embodiment of the present application provides an organic light emitting display device prepared by the above method, and the display device comprises:

[0092] a substrate substrate 1;

[0093] a black matrix layer 2 formed on the substrate substrate, and an opening corresponding to a sub-pixel of the organic light emitting display device is formed on the black matrix layer 2, the sub-pixel includes a red sub-pixel, a green sub-pixel and a blue sub-pixel, a red quantum dot layer is formed on the opening corresponding to the red sub-pixel, a green quantum dot layer is formed on the opening corresponding to the green sub-pixel, and a transparent layer is formed on the opening corresponding to the blue sub-pixel;

[0094] a blue-transmitting red-green reflecting layer 3 formed on the side of the black matrix layer 2 away from the substrate substrate;

[0095] The blue light organic light emitting device layer 4 is formed on the side of the blue-rejecting red-and-green-accepting layer 3 away from the black matrix layer.

[0096] Optionally, the material of the red quantum dot layer and the green quantum dot layer is cadmium-free quantum dot material.

[0097] The computer program instructions can also be loaded onto a computer, other programmable data processing apparatus, or other processing devices to cause a series of operational steps to be performed on the computer, other programmable apparatus or other processing devices to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide processes for implementing the functions / acts specified in the flowchart and / or block diagram block or blocks.

[0098] Accordingly, the present application can also be embodied in hardware and / or in software (including firmware, resident software, micro-code, etc.). Furthermore, the present application can take the form of a computer program product on a computer-usable or computer-readable storage medium having computer-usable or computer-readable program code embodied in the medium for use by or in connection with an instruction execution system. In the context of the present application, a computer-usable or computer-readable medium can be any medium that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device.

[0099] Obviously, various modifications and changes can be made to the present application without departing from the spirit and scope of the application. Accordingly, it is intended that all such modifications and changes be included within the scope of the application as expressed in the following claims and their equivalents.

Claims

1. An organic light emitting display device, characterized by, The display device comprises: a substrate substrate; a black matrix layer formed on the substrate substrate, and having openings corresponding to sub-pixels of an organic light-emitting display device one by one on the black matrix layer, the sub-pixels comprising red sub-pixels, green sub-pixels and blue sub-pixels, a red quantum dot layer being formed on the openings corresponding to the red sub-pixels, a green quantum dot layer being formed on the openings corresponding to the green sub-pixels, and a transparent layer being formed on the openings corresponding to the blue sub-pixels; a blue-transmitting red-green-reflecting layer formed on a side of the black matrix layer away from the substrate substrate; a stacked blue light organic light-emitting device layer formed on a side of the blue-transmitting red-green-reflecting layer away from the black matrix layer, wherein the stacked blue light organic light-emitting device layer is a blue monochromatic active matrix organic light-emitting diode or a blue monochromatic active matrix organic light-emitting diode, and a light-emitting direction of the stacked blue light organic light-emitting device layer is towards the substrate substrate.

2. A display device as claimed in claim 1, characterized in that The red quantum dot layer and the green quantum dot layer are made of cadmium-free quantum dot materials.

3. The display device as described in claim 2, characterized in that, The cadmium-free quantum dot materials are any one of indium phosphide, perovskite, carbon quantum dots and sulfur quantum dots.

4. The display device of claim 1, wherein, The blue-transmitting red-green-reflecting layer is a titanium oxide layer or a silicon oxide layer.

5. The display device as described in claim 4, characterized in that, The blue-transmitting red-green-reflecting layer has 6-15 periods.

6. A method for fabricating an organic light-emitting display device as described in any one of claims 1-5, characterized in that, The method comprises: forming a black matrix layer on a substrate substrate, and forming openings corresponding to sub-pixels of an organic light-emitting display device one by one on the black matrix layer by a patterning process, the sub-pixels comprising red sub-pixels, green sub-pixels and blue sub-pixels; filling quantum dot materials of corresponding colors in the openings corresponding to the red sub-pixels and the green sub-pixels and forming quantum dot layers of the corresponding colors, and filling transparent materials in the openings corresponding to the blue sub-pixels and forming a transparent layer; forming a blue-transmitting red-green-reflecting layer on the black matrix layer; forming a stacked blue light organic light-emitting device layer on the blue-transmitting red-green-reflecting layer, wherein the stacked blue light organic light-emitting device layer is a blue monochromatic active matrix organic light-emitting diode or a blue monochromatic active matrix organic light-emitting diode, and a light-emitting direction of the stacked blue light organic light-emitting device layer is towards the substrate substrate.

7. The method of claim 6, wherein, The filling of the quantum dot materials of corresponding colors in the openings corresponding to the red sub-pixels and the green sub-pixels and the forming of the quantum dot layers of the corresponding colors comprises: filling solvent-type quantum dot materials of corresponding colors in the openings corresponding to the red sub-pixels and the green sub-pixels; pre-solidifying the solvent-type quantum dot materials of corresponding colors filled in the openings corresponding to the red sub-pixels and the green sub-pixels by preheating; performing heat curing on the solvent-type quantum dot materials of corresponding colors filled in the openings corresponding to the red sub-pixels and the green sub-pixels to form red quantum dot layers and green quantum dot layers.

8. The method of claim 6, wherein, The filling of the quantum dot material of the corresponding color in the opening corresponding to the red sub-pixel and the green sub-pixel to form the quantum dot layer of the corresponding color comprises: The filling of the solvent-free quantum dot material of the corresponding color in the opening corresponding to the red sub-pixel and the green sub-pixel; The filling of the solvent-free quantum dot material of the corresponding color in the opening corresponding to the red sub-pixel and the green sub-pixel; 9. The method of claim 7 or 8, wherein, The filling of the solvent-free quantum dot material of the corresponding color in the opening corresponding to the red sub-pixel and the green sub-pixel comprises: The filling of the solvent-free quantum dot material of the corresponding color in the opening corresponding to the red sub-pixel and the green sub-pixel by the inkjet printing mode; Or the filling of the quantum dot material of the corresponding color with solvent in the opening corresponding to the red sub-pixel and the green sub-pixel comprises: The filling of the quantum dot material of the corresponding color with solvent in the opening corresponding to the red sub-pixel and the green sub-pixel by the inkjet printing mode.

10. The method of claim 6, wherein, The formation of the laminated blue light organic light emitting device layer on the blue light transmitting and red and green light reflecting layer comprises: The formation of the laminated blue light organic light emitting device layer on the blue light transmitting and red and green light reflecting layer by the evaporation mode.

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