Display panel, display device and manufacturing method

Abstract

The application discloses a display panel, a display device and a manufacturing method. The display panel comprises a substrate, a single-color light-emitting layer, a connecting layer and a mixed-color light-emitting layer arranged on the substrate in sequence. The single-color light-emitting layer is used for emitting first color light. The mixed-color light-emitting layer comprises a first light-emitting area and a second light-emitting area arranged in an array. The first light-emitting area is used for emitting the first color light. The second light-emitting area is used for emitting second color light. The second light-emitting area comprises a first conversion layer and a second color light-emitting layer located on the first conversion layer. The maximum absorption spectrum of the first conversion layer is located in a first color light wave band. The maximum emission spectrum of the first conversion layer is located in a second color light wave band, so that the first color light can be absorbed and converted to emit the second color light. The display panel provided by the application can balance the light-emitting efficiency and the process complexity.

Description

Technical Field

[0001] This invention relates to the field of display technology, and in particular to a display panel, display device, and manufacturing method. Background Technology

[0002] With the development of electronic technology, display panels are being used more and more in various devices. Smartphones, tablets, wearable devices and other common devices all rely on display panels.

[0003] Low power consumption is one of the current development trends in display panels, which requires continuous improvement in luminous efficiency to ensure lower driving current at the same brightness. In addition to luminous efficiency, process complexity is also an important indicator of display panels, as it directly affects cost and production capacity. Therefore, there is an urgent need for solutions that can balance luminous efficiency and process complexity. Summary of the Invention

[0004] In view of the above problems, the present invention is proposed to provide a display panel, display device and manufacturing method that overcome or at least partially solve the above problems.

[0005] In a first aspect, a display panel is provided, comprising:

[0006] A substrate, and a monochromatic light-emitting layer, a connecting layer and a color-mixing light-emitting layer sequentially disposed on the substrate, wherein the monochromatic light-emitting layer is used to emit a first color light;

[0007] The color-mixing light-emitting layer includes a first light-emitting area and a second light-emitting area arranged in a row. The first light-emitting area is used to emit light of the first color, and the second light-emitting area is used to emit light of the second color.

[0008] The second light-emitting region includes a first conversion layer and a second color light-emitting layer located on the first conversion layer, wherein the maximum absorption spectrum of the first conversion layer is located in the first color light band, and the maximum emission spectrum of the first conversion layer is located in the second color light band, so as to absorb the first color light and convert it to emit the second color light.

[0009] Optionally, the first color light is green light, and the second color light is red light or blue light.

[0010] Optionally, the color-mixing light-emitting layer further includes a third light-emitting region for emitting a third color light; the third light-emitting region includes a second conversion layer and a third color light-emitting layer located on the second conversion layer, wherein the maximum absorption spectrum of the second conversion layer is located in the first color light band, and the maximum emission spectrum of the second conversion layer is located in the third color light band, so as to absorb the first color light and convert it to emit the third color light; wherein the first color light is green light, the second color light is red light, and the third color light is blue light.

[0011] Optionally, when the first color light is green light and the second color light is red light, the first conversion layer includes a down-conversion luminescent material, which is DCM, DCJ, DCJT or TPBD; when the first color light is green light and the second color light is blue light, the first conversion layer includes an up-conversion luminescent material, which is DTA, DFA, DPTA, DPFA, DBA or DTBA.

[0012] Optionally, the first conversion layer includes a conversion luminescent material and a sensitizing material; the conversion luminescent material and the sensitizing material are doped together, or the sensitizing material is coated on the surface of the conversion luminescent material; the maximum absorption spectrum of the conversion luminescent material is located in the first color light band, and the maximum emission spectrum of the conversion luminescent material is located in the second color light band, so as to absorb the first color light and convert it to emit the second color light; the sensitizing material is used to improve the conversion luminescence efficiency of the conversion luminescent material.

[0013] Optionally, when the first color light is green light and the second color light is blue light, the sensitizing material is a porphyrin palladium complex.

[0014] Optionally, the connecting layer includes: an N-type exciton generation layer and a P-type exciton generation layer stacked together.

[0015] Optionally, a filter layer is further included above the color-mixing light-emitting layer. The filter layer includes a first filter area and a second filter area. The orthographic projection of the first filter area covers the first light-emitting area and is used to allow the first color light to pass through. The orthographic projection of the second filter area covers the second light-emitting area and is used to allow the second color light to pass through.

[0016] Optionally, the color-mixing light-emitting layer further includes: a pixel-defining region located between each light-emitting region; wherein the upper surface of the pixel-defining region is undulating to increase the spacing length of the upper surface of the pixel-defining region between adjacent light-emitting regions.

[0017] Optionally, the display panel further includes: a first electrode, a hole transport layer, a monochromatic light-emitting layer, a connection layer, a color-mixing light-emitting layer, an electron transport layer, and a second electrode, which are sequentially disposed on the substrate.

[0018] Secondly, a method for manufacturing a display panel is provided, comprising:

[0019] Provide substrate;

[0020] A monochromatic light-emitting layer and a bonding layer are sequentially fabricated on the substrate, wherein the monochromatic light-emitting layer is used to emit light of a first color.

[0021] A color-mixing light-emitting layer is prepared on the connecting layer. The color-mixing light-emitting layer includes a first light-emitting area and a second light-emitting area arranged in a row. The first light-emitting area is used to emit light of the first color, and the second light-emitting area is used to emit light of the second color.

[0022] The method for preparing the second light-emitting region includes: sequentially preparing a first conversion layer and a second color light-emitting layer on the connecting layer, wherein the maximum absorption spectrum of the first conversion layer is located in the first color light band, and the maximum emission spectrum of the first conversion layer is located in the second color light band, so as to absorb the first color light and convert it to emit the second color light.

[0023] Thirdly, a display device is provided, including the display panel described in the first aspect.

[0024] The technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

[0025] The display panel, display device, and manufacturing method provided in this invention utilize a double-layered light-emitting layer to improve luminous efficiency. A monochromatic light-emitting layer is placed at the bottom to emit a first color of light. A mixed-color light-emitting layer is placed on top, comprising a first light-emitting area and a second light-emitting area arranged in an array. The first light-emitting area emits the first color of light, and the second light-emitting area emits a second color of light. The second light-emitting area includes a first conversion layer and a second-color light-emitting layer located on the first conversion layer. The first conversion layer absorbs the first color of light and converts it to emit the second color of light. Since the lower layer is a monochromatic light-emitting layer, only the fabrication of this monochromatic light-emitting layer needs to be performed once, eliminating the need to sequentially fabricate multiple color light-emitting layers at the bottom, thus simplifying the process complexity. Furthermore, by setting the first conversion layer below the second light-emitting area of ​​the mixed-color light-emitting layer to absorb the first color of light emitted by the monochromatic light-emitting layer and the surrounding environment and convert it to emit the second color of light, the luminous efficiency of each color of light is ensured while also simplifying the process complexity. Attached Figure Description

[0026] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0027] Figure 1 This is a schematic diagram of a conventional double-layered display panel in an embodiment of the present invention;

[0028] Figure 2 This is a structural diagram of the display panel in an embodiment of the present invention;

[0029] Figure 3 This is a molecular structure diagram of the upconversion luminescent material in an embodiment of the present invention;

[0030] Figure 4 This is a molecular structure diagram of the downconversion luminescent material in an embodiment of the present invention;

[0031] Figure 5 This is a molecular structure diagram of the sensitizing molecule in the embodiments of the present invention;

[0032] Figure 6 This is a schematic diagram of the filter layer in an embodiment of the present invention;

[0033] Figure 7 This is a schematic diagram of the shape of the pixel definition area in an embodiment of the present invention;

[0034] Figure 8 This is a comparison of the simulated spectra of the luminescence intensity experiment in this embodiment of the invention;

[0035] Figure 9 This is a flowchart of the method for preparing the display panel in an embodiment of the present invention;

[0036] Figure 10 This is a process flow diagram of the display panel fabrication chamber in an embodiment of the present invention;

[0037] Figure 11 This is a structural diagram of the display device in an embodiment of the present invention. Detailed Implementation

[0038] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concepts of the present disclosure.

[0039] The accompanying drawings illustrate various structural schematics according to embodiments of the present disclosure. These drawings are not to scale, and some details have been enlarged for clarity, and some details may have been omitted. The shapes of the various regions and layers shown in the drawings, as well as their relative sizes and positional relationships, are merely exemplary and may deviate from reality due to manufacturing tolerances or technical limitations. Furthermore, those skilled in the art can design regions / layers with different shapes, sizes, and relative positions as needed.

[0040] In the context of this disclosure, when a layer / element is referred to as being "above" another layer / element, the layer / element may be directly above the other layer / element, or there may be an intermediate layer / element between them. Additionally, if a layer / element is "above" another layer / element in one orientation, then when the orientation is reversed, the layer / element may be "below" the other layer / element.

[0041] Please see Figure 1 Currently, dual-layer display panels use mixed-color emitting layers on both the top and bottom layers to improve luminous efficiency. The red (R), green (G), and blue (B) emitting areas on both layers are aligned to increase the luminous efficiency of each color. While this dual-layer display panel improves both the luminous efficiency and lifespan of the devices, compared to traditional single-layer emitting display panels, it adds an extra mixed-color emitting layer and an intermediate connecting layer, significantly increasing the number of chambers required for the process. This transforms what should have been single-line production into dual-line production, resulting in a substantial reduction in capacity and an increase in cost.

[0042] Please see Figure 2 The present invention provides a display panel, comprising:

[0043] The substrate comprises a monochromatic light-emitting layer 1, a connecting layer 2, and a color-mixing light-emitting layer 3 sequentially disposed on the substrate. The monochromatic light-emitting layer 1 emits a first color of light. The color-mixing light-emitting layer 3 includes a first light-emitting region 31 and a second light-emitting region 32 arranged thereon. The first light-emitting region 31 emits the first color of light, and the second light-emitting region 32 emits a second color of light. The second light-emitting region 32 includes a first conversion layer 321 and a second color light-emitting layer 322 located on the first conversion layer 321. The maximum absorption spectrum of the first conversion layer 321 is located in the first color of light band, and the maximum emission spectrum of the first conversion layer 321 is located in the second color of light band, so as to absorb the first color of light and convert it to emit the second color of light.

[0044] The display panel can be an Organic Light-Emitting Diode (OLED) display panel or a Light Emitting Diode (LED) display panel, without limitation. Specifically, the display panel is generally an RGB light-emitting mode, that is, the light-emitting layer of the display panel has red light-emitting areas, green light-emitting areas, and blue light-emitting areas. Among them, the first light-emitting area 31 and the second light-emitting area 32 can be any light-emitting areas of different colors.

[0045] In an optional implementation, a monochromatic light-emitting layer 1 emits green light, the first light-emitting area 31 is a green light-emitting area, and the second light-emitting area 32 is a red light-emitting area or a blue light-emitting area. Because the luminous efficiency of OLED light-emitting materials of different colors varies, the luminous efficiency of green light is greater than that of red and blue light. In a dual-layer structure, the difference in luminous efficiency will be further amplified, easily leading to display quality problems such as low grayscale image quality, post-reliability image quality, and color cast in lifetime. Therefore, setting the second light-emitting area 32 to emit either red or blue light can further improve the luminous efficiency of red or blue light through the light absorption and conversion effect of the first conversion layer 321, making the luminous performance of RGB as close as possible, thereby ensuring display quality while improving luminous efficiency.

[0046] like Figure 2 As shown, the color-mixing light-emitting layer 3 may also include a third light-emitting region 33, which is used to emit a third color of light. In this case, there are two structural configurations:

[0047] The first type has a conversion layer only in the second light-emitting area 32, and no conversion layer in the third light-emitting area 33.

[0048] For example, monochromatic light-emitting layer 1 emits green light, with the first light-emitting area 31 emitting green light, the second light-emitting area 32 emitting red light, and the third light-emitting area 33 emitting blue light. This means only a conversion layer is used to improve the luminous efficiency of red light. Alternatively, monochromatic light-emitting layer 1 emits green light, with the first light-emitting area 31 emitting green light, the second light-emitting area 32 emitting blue light, and the third light-emitting area 33 emitting red light. This again means only a conversion layer is used to improve the luminous efficiency of blue light.

[0049] The second type has a conversion layer in both the second light-emitting area 32 and the third light-emitting area 33.

[0050] That is, the third light-emitting region 33 includes a second conversion layer 331 and a third color light-emitting layer 332 located on the second conversion layer 331. The maximum absorption spectrum of the second conversion layer 331 is located in the first color light band, and the maximum emission spectrum of the second conversion layer is located in the third color light band, so as to absorb the first color light and convert and emit the third color light.

[0051] For example, the monochromatic light-emitting layer 1 emits green light, the first light-emitting area 31 is the green light-emitting area, the second light-emitting area 32 is the red light-emitting area, and the third light-emitting area 33 is the blue light-emitting area. By setting conversion layers in both the second light-emitting area 32 and the third light-emitting area 33, the luminous efficiency of red and blue light is further improved, making the luminous efficiency of the emitted RGB three colors of light as close as possible, thereby achieving the effect of ensuring display quality while improving luminous efficiency.

[0052] Of course, the above examples all take into account the fact that green light has the highest luminous efficiency among the RGB color luminescent materials. Therefore, the first luminous area 31 is set to emit green light to reduce display quality issues. Other settings can be made according to different needs, and no restrictions are imposed here.

[0053] It should also be noted that the materials used are different depending on the color type of the light absorbed and emitted by the first conversion layer 321. The conditions that need to be met are that the maximum absorption spectrum (absorption peak position) of the first conversion layer 321 is located in the first color light band, and the maximum emission spectrum (emission peak position) of the first conversion layer 321 is located in the second color light band.

[0054] Specifically, when the first color light is green and the second color light is blue, the first conversion layer 321 includes an upconversion luminescent material, which is an upconversion luminescent molecule that can emit blue light when excited by a green light wavelength. For example, as... Figure 3 As shown, the upconversion luminescent material is DTA, DFA, DPTA, DPFA, DBA, or DTBA. That is, an organic small molecule material with an emission peak in the blue light band and an absorption peak in the green light band is used as the upconversion luminescent material. This type of material has a high fluorescence quantum yield and guaranteed luminescence efficiency.

[0055] When the first color light is green and the second color light is red, the first conversion layer 321 includes a downconversion luminescent material, which is a downconversion luminescent molecule that can emit red light when excited by a green light wavelength. For example, Figure 4 As shown, the downconversion luminescent material is DCM, DCJ, DCJT, or TPBD. That is, an organic small molecule material with an emission peak in the red light band and an absorption peak in the green light band is used as the downconversion luminescent material. This type of material has a high fluorescence quantum yield and guaranteed luminescence efficiency.

[0056] Furthermore, the first conversion layer 321 can be configured to include not only the conversion-emitting material but also a sensitizing material. The maximum absorption spectrum of the conversion-emitting material is located in the first color light band, and the maximum emission spectrum is located in the second color light band, thus enabling the first conversion layer 321 to absorb the first color light and convert it to emit the second color light. The sensitizing material has strong absorption within the first color light band, used to improve the conversion efficiency of the conversion-emitting material. For example, such as... Figure 5 As shown, when the first color light is green light and the second color light is blue light, the blue light sensitizing material includes blue light sensitizing molecules of polycyclic metal compounds. The sensitizing molecule can also be a porphyrin palladium complex, such as PdTMePP, PdTPPCOOH or PdTPP.

[0057] The aforementioned sensitizing material and the conversion luminescent material can be mixed by doping, or the sensitizing material can be coated on all or part of the surface of the conversion luminescent material; there are no restrictions on this.

[0058] In this embodiment, a connecting layer 2 is provided between the monochromatic light-emitting layer 1 and the mixed-color light-emitting layer 3, connecting adjacent light-emitting layers and adjacent light-emitting areas within the light-emitting layers. Figure 2 As shown, the connecting layer 2 may include a stacked N-type exciton generation layer (N-CGL) 21 and a P-type exciton generation layer (P-CGL) 22 to provide a site for generating hole and electron carriers for the light-emitting layer, and to rapidly inject and transport the generated carriers to the adjacent functional layer of the light-emitting layer. Furthermore, a hole blocking layer (HBL) may be disposed below the stacked exciton generation layers to enhance the balance of hole and electron concentrations and balance the carrier concentration.

[0059] In an alternative implementation, after investigation, when Figure 2 When the display panel shown displays a monochrome image, the light emitted from adjacent light-emitting areas may excite other colors, and there may be lateral leakage current transmitted through the exciton generation layer between the monochrome light-emitting layer 1 and the color-mixing light-emitting layer 3 to adjacent sub-pixels, resulting in crosstalk and insufficient color purity in the monochrome image. Crosstalk can be reduced through the following improvements:

[0060] Improvement 1, such as Figure 6As shown, a filter layer 4 can be disposed on the color mixing light-emitting layer 3. This filter layer 4 includes a first filter area 41 and a second filter area 42. The orthographic projection of the first filter area 41 covers the first light-emitting area 31, allowing the first color light to pass through while filtering out stray light of other colors. The orthographic projection of the second filter area 42 covers the second light-emitting area 32, allowing the second color light to pass through while filtering out stray light of other colors. When the color mixing light-emitting layer 3 includes a third light-emitting area 33, the filter layer 4 also includes a third filter area 43, allowing the third color light to pass through while filtering out stray light of other colors. The filter areas can be isolated and fixed by a black matrix (BM) 44. By setting the filter layer 4, light of wavelengths other than its own color emitted by each light-emitting area can be filtered out, thereby effectively improving crosstalk and increasing color purity.

[0061] Improvement 2, such as Figure 7 As shown in the five sub-figures, the pixel delimiting region (PDL) 34 included in the color mixing light-emitting layer 3 can also be improved. This pixel delimiting region 34 is located between the light-emitting regions and is used to isolate and fix the light-emitting regions, preventing short circuits and tip discharge. The upper surface of the pixel delimiting region 34 can be configured (…). Figure 7 The area with thickened lines is undulating to increase the upper surface spacing length of the pixel boundary area 34 between adjacent light-emitting areas. Here, "undulating" means that compared to the existing upper surface... Figure 2 The planar shape shown has an improved upper surface with convex and / or concave structures. Of course, there can be various undulation methods, for example, besides... Figure 7 The stepped, pointed, sunken, or arc-shaped protrusions shown can also be wavy, arc-shaped, or serrated, and there are no restrictions on them here.

[0062] Specifically, the leakage current transmitted laterally is often transmitted along the upper surface of the pixel boundary region 34. By setting the upper surface of the pixel boundary region 34 to be undulating, the lateral transmission path length of the leakage current can be effectively increased. This can reduce the leakage current by increasing the transmission resistance, block the influence of light from adjacent pixels, and effectively improve crosstalk.

[0063] The above-mentioned improvement one or improvement two can be implemented either one or both to improve crosstalk, and no restrictions are placed here.

[0064] In alternative implementations, such as Figure 2 As shown, a transistor layer can also be disposed on the substrate to switch and drive the light-emitting area. A first electrode 5, a hole transport layer 6, a monochromatic light-emitting layer 1, a connecting layer 2, a color-mixing light-emitting layer 3, an electron transport layer 7, a second electrode 8, and a capping layer 9 are sequentially disposed on the transistor layer. The first electrode 5 is the anode, and the second electrode 8 is the cathode. Of course, the first electrode 5 can also be configured as the cathode and the second electrode 8 as the anode; this is not a limitation.

[0065] Specifically, the display panel provided in this application embodiment has a significantly improved luminous efficiency compared to existing single-layer light-emitting display panels, thereby reducing the driving current under the same display screen, reducing product power consumption, and improving battery life. Figure 8 As shown in the figure (wavelength on the horizontal axis and luminous intensity on the vertical axis), the simulated spectrum comparison of the luminous intensity experiment shows that the luminous intensity of red light increased by 20%, the luminous intensity of green light increased by 51%, and the luminous intensity of blue light increased by 14%.

[0066] The display panel provided in this application embodiment, compared to a display panel where both layers are color-mixing light-emitting layers, requires one less color-mixing light-emitting layer (details will be explained in the subsequent process description), thus reducing the number of chambers needed for the process, increasing production capacity, and lowering costs. Furthermore, the intensity of each color light is more similar after the process is improved, resulting in more balanced luminous performance and effectively avoiding problems such as low grayscale image quality, post-reliability image quality, and color shifts in lifespan.

[0067] Based on the same inventive concept, embodiments of the present invention also provide a method for manufacturing a display panel, such as... Figure 9 As shown, it includes:

[0068] Step S901: Provide a substrate;

[0069] Step S902: A monochromatic light-emitting layer and a bonding layer are sequentially prepared on the substrate, wherein the monochromatic light-emitting layer is used to emit light of a first color;

[0070] Step S903: A color-mixing light-emitting layer is prepared on the connecting layer. The color-mixing light-emitting layer includes a first light-emitting area and a second light-emitting area arranged in a row. The first light-emitting area is used to emit light of the first color, and the second light-emitting area is used to emit light of the second color.

[0071] The method for preparing the second luminescent region includes: sequentially preparing a first conversion layer and a second color luminescent layer on the connecting layer, wherein the maximum absorption spectrum of the first conversion layer is located in the first color light band, and the maximum emission spectrum of the first conversion layer is located in the second color light band, so as to absorb the first color light and convert it to emit the second color light.

[0072] In an optional implementation, in step S902, semiconductor processes such as deposition, etching, and cleaning are first used to sequentially fabricate a polysilicon layer, a gate electrode, and source / drain electrodes for the transistor layer on the substrate. Then, processes such as evaporation, sputtering, or etching are used to form a first electrode and a hole transport layer on the substrate. Next, a monochromatic light-emitting layer is fabricated using an open mask evaporation process, and a connection layer is fabricated using a deposition or evaporation process.

[0073] In step S903, a pixel defining region is deposited and etched on the interconnect layer. Then, a first light-emitting region and a second light-emitting region are prepared in the pixel region defined by the pixel defining region using a fine metal mask (FMM mask) evaporation process. The pixel defining region and each light-emitting region constitute the color-mixing light-emitting layer. An electron transport layer and a second electrode are then prepared on the color-mixing light-emitting layer using processes such as evaporation, sputtering, or etching.

[0074] Specifically, an open-mask evaporation process is used to form a monochromatic light-emitting layer. Since the monochromatic light-emitting layer is a complete coverage of the monochromatic light-emitting material, using an open mask can reduce mask costs. An FMM mask evaporation process is used to form the first and second light-emitting areas. The specific shape of the mask body corresponds to the shape and distribution of each light-emitting area to achieve precise coverage of the pixel arrangement of the mixed-color light-emitting layer.

[0075] Please see Figure 10 In this diagram, each square represents a process chamber, and solid lines connect the chambers that need to be used. The order from left to right indicates the sequence of use. A solid dot inside a process chamber indicates that the chamber needs to be used. The markings on each process chamber indicate the film layer that the chamber is used to prepare, specifically: hole transport layer HTL, blue emitting region B, and red emitting region auxiliary layer R. ’ Red luminescent area R, green luminescent area auxiliary layer G ’ The display panel is composed of a green light-emitting region (G), an electron transport layer (ETL), an exciton generation layer (CGL), a cathode (CTD), and a capping layer (CPL). As can be seen, the manufacturing method (c) of this embodiment requires 11 chambers, slightly more than the 9 chambers required for the manufacturing method of a single-layer light-emitting display panel (a). However, compared to the 14 chambers required for the manufacturing method of a display panel with two mixed-color light-emitting layers, the number is significantly reduced. Furthermore, only one production line is needed to meet the process requirements of 11 chambers, eliminating the need for parallel production with two separate lines, greatly increasing production capacity and effectively reducing costs.

[0076] Since the method for manufacturing the display panel described in this embodiment of the invention is the same as the method for manufacturing the display panel described in this embodiment, and its specific implementation has been explained in the process of describing the display panel, those skilled in the art can understand the specific process and variations of this method based on the display panel described in this embodiment of the invention, and therefore will not be repeated here. All manufacturing methods corresponding to the display panel in this embodiment of the invention fall within the scope of protection of this invention.

[0077] Based on the same inventive concept, embodiments of the present invention also provide a display device, such as... Figure 11 The diagram shown is a structural diagram of a display device in an embodiment of the present invention, including a display panel 1101 provided in an embodiment of the present invention.

[0078] The technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

[0079] The display panel, display device, and manufacturing method provided in this invention utilize a double-layered light-emitting layer to improve luminous efficiency. A monochromatic light-emitting layer is placed at the bottom to emit a first color of light. A mixed-color light-emitting layer is placed on top, comprising a first light-emitting area and a second light-emitting area arranged in an array. The first light-emitting area emits the first color of light, and the second light-emitting area emits a second color of light. The second light-emitting area includes a first conversion layer and a second-color light-emitting layer located on the first conversion layer. The first conversion layer absorbs the first color of light and converts it to emit the second color of light. Since the lower layer is a monochromatic light-emitting layer, only the fabrication of this monochromatic light-emitting layer needs to be performed once, eliminating the need to sequentially fabricate multiple color light-emitting layers at the bottom, thus simplifying the process complexity. Furthermore, by setting the first conversion layer below the second light-emitting area of ​​the mixed-color light-emitting layer to absorb the first color of light emitted by the monochromatic light-emitting layer and the surrounding environment and convert it to emit the second color of light, the luminous efficiency of each color of light is ensured while also simplifying the process complexity.

[0080] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0081] Similarly, it should be understood that, in order to simplify this disclosure and aid in understanding one or more of the various aspects of the invention, in the above description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof. However, this method of disclosure should not be construed as reflecting an intention that the claimed invention requires more features than are expressly recited in each claim. Rather, as reflected in the following claims, inventive aspects lie in fewer than all features of a single foregoing disclosed embodiment. Therefore, the claims following the detailed description are hereby expressly incorporated into this detailed description, wherein each claim itself is a separate embodiment of the invention.

[0082] Those skilled in the art will understand that modules in the apparatus of the embodiments can be adaptively changed and placed in one or more apparatuses different from that embodiment. Modules, units, or components in the embodiments can be combined into a single module, unit, or component, and further, they can be divided into multiple sub-modules, sub-units, or sub-components. Except where at least some of such features and / or processes or units are mutually exclusive, any combination can be used to combine all features disclosed in this specification (including the accompanying claims, abstract, and drawings) and all processes or units of any method or apparatus so disclosed. Unless expressly stated otherwise, each feature disclosed in this specification (including the accompanying claims, abstract, and drawings) may be replaced by an alternative feature that serves the same, equivalent, or similar purpose.

[0083] Furthermore, those skilled in the art will understand that although some embodiments herein include certain features included in other embodiments but not others, combinations of features from different embodiments are intended to be within the scope of the invention and form different embodiments. For example, in the following claims, any of the claimed embodiments can be used in any combination.

[0084] It should be noted that the above embodiments are illustrative of the invention and not restrictive, and that those skilled in the art can devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses should not be construed as limiting the claims. The word "comprising" does not exclude the presence of components or steps not listed in the claims. The word "a" or "an" preceding a component does not exclude the presence of a plurality of such components. The invention can be implemented by means of hardware comprising several different components and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by the same item of hardware. The use of the words first, second, and third, etc., does not indicate any order. These words can be interpreted as names.

Claims

1. A display panel, characterized in that, include: A substrate, and a monochromatic light-emitting layer, a connecting layer and a color-mixing light-emitting layer sequentially disposed on the substrate, wherein the monochromatic light-emitting layer is used to emit a first color light; The color-mixing light-emitting layer includes a first light-emitting area and a second light-emitting area arranged in a row. The first light-emitting area is used to emit light of the first color, and the second light-emitting area is used to emit light of the second color. The second light-emitting region includes a first conversion layer and a second color light-emitting layer located on the first conversion layer, wherein the maximum absorption spectrum of the first conversion layer is located in the first color light band, and the maximum emission spectrum of the first conversion layer is located in the second color light band, so as to absorb the first color light and convert it to emit the second color light.

2. The display panel as described in claim 1, characterized in that: The first color light is green light, and the second color light is either red light or blue light.

3. The display panel as described in claim 1, characterized in that: The color-mixing light-emitting layer further includes a third light-emitting region, which is used to emit a third color light; the third light-emitting region includes a second conversion layer and a third color light-emitting layer located on the second conversion layer, wherein the maximum absorption spectrum of the second conversion layer is located in the first color light band, and the maximum emission spectrum of the second conversion layer is located in the third color light band, so as to absorb the first color light and convert it to emit the third color light; Wherein, the first color light is green light, the second color light is red light, and the third color light is blue light.

4. The display panel as described in claim 1, characterized in that: When the first color light is green light and the second color light is red light, the first conversion layer includes a down-conversion luminescent material, wherein the down-conversion luminescent material is DCM, DCJ, DCJT or TPBD; When the first color light is green light and the second color light is blue light, the first conversion layer includes an upconversion luminescent material, which is DTA, DFA, DPTA, DPFA, DBA, or DTBA.

5. The display panel as described in claim 1, characterized in that: The first conversion layer includes a conversion luminescent material and a sensitizing material; the conversion luminescent material and the sensitizing material are doped together, or the sensitizing material is coated on the surface of the conversion luminescent material; The maximum absorption spectrum of the luminescent material is located in the first color light band, and the maximum emission spectrum of the luminescent material is located in the second color light band, so as to absorb the first color light and convert it to emit the second color light; The sensitizing material is used to improve the conversion efficiency of the conversion luminescence material.

6. The display panel as described in claim 5, characterized in that, When the first color light is green light and the second color light is blue light, the sensitizing material is a porphyrin palladium complex.

7. The display panel as described in claim 1, characterized in that, The connection layer includes: The N-type exciton generation layer and the P-type exciton generation layer are stacked together.

8. The display panel as described in claim 1, characterized in that: A filter layer is also included above the color mixing light-emitting layer, and the filter layer includes a first filter area and a second filter area; The orthographic projection of the first filter area covers the first light-emitting area and is used to allow the first color light to pass through; the orthographic projection of the second filter area covers the second light-emitting area and is used to allow the second color light to pass through.

9. The display panel as claimed in claim 1, characterized in that, The color-mixing light-emitting layer further includes: A pixel defining region is located between each light-emitting region; wherein the upper surface of the pixel defining region is undulating to increase the spacing length of the upper surface of the pixel defining region between adjacent light-emitting regions.

10. The display panel as claimed in claim 1, characterized in that, include: The first electrode, hole transport layer, monochromatic light-emitting layer, connecting layer, mixed color light-emitting layer, electron transport layer, and second electrode are sequentially disposed on the substrate.

11. A method for manufacturing a display panel, characterized in that, include: Provide substrate; A monochromatic light-emitting layer and a bonding layer are sequentially fabricated on the substrate, wherein the monochromatic light-emitting layer is used to emit light of a first color. A color-mixing light-emitting layer is prepared on the connecting layer. The color-mixing light-emitting layer includes a first light-emitting area and a second light-emitting area arranged in an array. The first light-emitting area is used to emit light of the first color, and the second light-emitting area is used to emit light of the second color. The method for preparing the second light-emitting region includes: sequentially preparing a first conversion layer and a second color light-emitting layer on the connecting layer, wherein the maximum absorption spectrum of the first conversion layer is located in the first color light band, and the maximum emission spectrum of the first conversion layer is located in the second color light band, so as to absorb the first color light and convert it to emit the second color light.

12. A display device, characterized in that, Includes the display panel as described in any one of claims 1 to 10.

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