Display panel, display device and method for manufacturing display panel

Abstract

The present invention discloses a display panel, a display device and a method for manufacturing a display panel, so as to improve the light extraction efficiency of the display panel and make the display panel have a higher color gamut. The display panel comprises: a substrate; a light emitting structure, the light emitting structure is located on one side of the substrate; a light conversion structure, the light conversion structure is located on the side of the light emitting structure away from the substrate, and comprises a stacked optical pattern layer and a color conversion layer, the optical pattern layer has a plurality of protrusions on the side away from the light emitting structure; the color conversion layer converts the light emitted by the light emitting structure; a color filter layer, the color filter layer is located on the side of the light conversion structure away from the light emitting structure, and has a plurality of color resists, and the color resists filter the light converted by the color conversion layer.

Description

Technical Field

[0001] The present invention relates to the field of semiconductor technology, and in particular to a display panel, a display device and a method for manufacturing the display panel. Background Art

[0002] Currently, organic light emitting diode (OLED) display technology is mainly used in mobile phones, televisions, etc., and will be used in tablet / notebook computers, cars, AR / VR and other display fields in the future. As customers' demands for product power consumption are getting higher and higher, the luminous efficiency of products from various OLED manufacturers on the market has approached the efficiency limit of electroluminescent (EL) materials, so other methods are needed to improve the luminous efficiency of products to meet customer needs.

[0003] At the same time, as customers demand high fidelity and high color purity for product display effects, we need to further adjust the color coordinates of the three primary colors of red, green, and blue to deep red, deep green, and deep blue to ensure that we can meet future customer demand for display color gamut BT2020 (Rx: 0.708, Gx: 0.170, By: 0.046). Currently, replacing EL materials and adjusting the microcavity of the OLED device structure can no longer make the color coordinates of the three primary colors of Red, Green, and Blue meet the BT2020 specifications while ensuring other optical properties of the product. Therefore, other methods are needed to improve the color gamut of the product to meet customer needs. Summary of the invention

[0004] The present invention provides a display panel, a display device and a method for manufacturing the display panel, so as to improve the light extraction efficiency of the display panel and enable the display panel to have a higher color gamut.

[0005] An embodiment of the present invention provides a display panel, including:

[0006] substrate substrate;

[0007] A light emitting structure, wherein the light emitting structure is located on one side of the base substrate;

[0008] A light conversion structure, the light conversion structure is located on a side of the light emitting structure away from the base substrate, and includes a stacked optical pattern layer and a color conversion layer, wherein the optical pattern layer has a plurality of protrusions on a side away from the light emitting structure; the color conversion layer converts light emitted from the light emitting structure;

[0009] A color filter layer is located on a side of the light conversion structure away from the light emitting structure and has a plurality of color resists, and the color resists filter the light converted by the color conversion layer.

[0010] In a possible implementation, the color conversion layer includes a matrix, and color conversion particles distributed in the matrix;

[0011] The light conversion structure further includes a low refractive index layer in contact with the color conversion layer, wherein the refractive index of the low refractive index layer is lower than the refractive index of the matrix.

[0012] In a possible implementation, the refractive index n of the low refractive index layer satisfies: 1.1≤n≤1.4.

[0013] In a possible implementation, the low refractive index layer is located on a side of the color conversion layer facing the light emitting structure; the optical pattern layer is located on a side of the low refractive index layer facing the light emitting structure; and the low refractive index layer is reused as the first flat layer.

[0014] In a possible implementation, the low refractive index layer is located on a side of the color conversion layer away from the light emitting structure; and the optical pattern layer is located on a side of the color conversion layer facing the light emitting structure.

[0015] In a possible implementation, the optical pattern layer is in direct contact with the color conversion layer.

[0016] In a possible implementation manner, the low refractive index layer is located on a side of the color conversion layer away from the light emitting structure; and the light pattern layer is located on a side of the low refractive index layer away from the color conversion layer.

[0017] In a possible implementation manner, a second flat layer is further provided between the optical pattern layer and the color filter layer.

[0018] In a possible implementation, the display panel further includes a black matrix having a plurality of openings, and the color resist is located in the openings;

[0019] The orthographic projection of the opening on the base substrate covers the orthographic projection of at least one of the protrusions on the base substrate.

[0020] In a possible implementation, the optical pattern layer includes a plurality of repeating units, each of the repeating units includes a plurality of protrusions, and the plurality of protrusions of the same repeating unit form a quadrilateral or a hexagon.

[0021] In a possible implementation, the shape of the protrusion includes at least one of a hemispherical shape, a conical shape, a quadrangular pyramid shape, and a hexagonal pyramid shape.

[0022] In a possible implementation, the display panel further includes an encapsulation layer located between the light emitting structure and the light conversion structure.

[0023] In a possible implementation, the encapsulation layer includes a first inorganic encapsulation layer, an organic encapsulation layer, and a second inorganic encapsulation layer which are stacked.

[0024] In a possible implementation, the color conversion layer is a whole layer of white light quantum dot conversion layer.

[0025] In a possible implementation, the color conversion particles include: red quantum dots and green quantum dots.

[0026] In a possible implementation, the color conversion layer further includes scattering particles distributed in the matrix.

[0027] In a possible implementation, the mass ratio of the red quantum dots to the green quantum dots is in the range of 0.8:1 to 1:1; the mass ratio of the scattering particles to the red quantum dots is in the range of 1:8 to 1:10.

[0028] In a possible implementation, the light emitting structure includes a plurality of organic light emitting elements emitting blue light corresponding one-to-one to the color resists.

[0029] In a possible implementation, the display panel further includes a pixel defining layer having a plurality of pixel defining openings, and the organic light emitting element is located in the pixel defining openings.

[0030] An embodiment of the present invention further provides a display device, comprising the display panel provided by the embodiment of the present invention.

[0031] The embodiment of the present invention further provides a method for manufacturing the display panel provided in the embodiment of the present invention, comprising:

[0032] Providing a substrate;

[0033] A light emitting structure is formed on one side of the base substrate:

[0034] A light conversion structure is formed on a side of the light emitting structure away from the base substrate, wherein the light conversion structure comprises an optical pattern layer and a color conversion layer which are stacked, and the optical pattern layer has a plurality of protrusions on a side away from the backlight emitting layer; and the color conversion layer converts light emitted from the light emitting structure;

[0035] A color filter layer is formed on a side of the light conversion structure away from the light emitting structure.

[0036] In a possible implementation manner, forming a light conversion structure on a side of the light emitting structure away from the base substrate includes:

[0037] By spin coating or printing, a whole layer of white light quantum dot conversion layer is formed as the color conversion layer.

[0038] The beneficial effects of the embodiments of the present invention are as follows: In the embodiments of the present invention, the light conversion structure includes a stacked optical pattern layer and a color conversion layer, the optical pattern layer has a plurality of protrusions on the side away from the light-emitting structure, the protrusions can converge the incident light and then emit it, thereby improving the light output efficiency of the optical pattern layer, and further improving the light output efficiency of the display panel; and by using the light-emitting structure 2 in combination with the color conversion layer and the color film layer to achieve color display, the display panel can have a higher color gamut. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 One of the schematic diagrams of a display panel provided by an embodiment of the present invention;

[0040] Figure 2 A second schematic diagram of a display panel provided by an embodiment of the present invention;

[0041] Figure 3 A third schematic diagram of a display panel provided by an embodiment of the present invention;

[0042] Figure 4 A fourth schematic diagram of a display panel provided in an embodiment of the present invention;

[0043] Figure 5 A fifth schematic diagram of a display panel provided in an embodiment of the present invention;

[0044] Figure 6 A sixth schematic diagram of a display panel provided in an embodiment of the present invention;

[0045] Figure 7 A schematic diagram of a color conversion layer provided by an embodiment of the present invention;

[0046] Figure 8 A schematic diagram showing the effect of different refractive indices of the low refractive index layer on the light extraction efficiency of the organic light emitting element provided in an embodiment of the present invention;

[0047] Fig. 9 A schematic diagram showing the effect of different thicknesses of the low refractive index layer on the light extraction efficiency of the organic light emitting element provided in an embodiment of the present invention;

[0048] Fig.10 A schematic diagram of the brightness attenuation of an organic light-emitting element when an optical pattern layer and a low refractive index layer are provided and when no optical pattern layer and a low refractive index layer are provided;

[0049] Fig.11A schematic diagram showing the effect of setting an optical pattern layer, a low refractive index layer and not setting an optical pattern layer, a low refractive index layer on the color shift trajectory of an organic light-emitting element;

[0050] Fig.12 One of the schematic diagrams of protrusion arrangement provided in an embodiment of the present invention;

[0051] Fig.13 The second schematic diagram of the arrangement of protrusions provided in the embodiment of the present invention;

[0052] Fig.14 A schematic diagram of a case where the protrusion provided in an embodiment of the present invention is a quadrangular pyramid;

[0053] Fig.15 A schematic diagram showing the effect of different shapes of protrusions on the light extraction efficiency of an organic light-emitting element provided in an embodiment of the present invention;

[0054] Fig.16 A schematic diagram of the color gamut of a white light quantum dot film layer provided by an embodiment of the present invention;

[0055] Fig.17 A schematic diagram of the color gamut of a color filter layer provided on a white light quantum dot film layer according to an embodiment of the present invention;

[0056] Fig.18 One of the schematic diagrams of an organic light-emitting element provided in an embodiment of the present invention;

[0057] Fig.19 A second schematic diagram of an organic light emitting element provided in an embodiment of the present invention;

[0058] Fig. 20 A schematic diagram of a thin film transistor provided by an embodiment of the present invention;

[0059] Fig.21 A schematic diagram of a manufacturing process of a display panel provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0060] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0061] Unless otherwise defined, the technical terms or scientific terms used in the present disclosure should be understood by people with ordinary skills in the field to which the present disclosure belongs. The "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0062] In order to keep the following description of the embodiments of the present disclosure clear and concise, the present disclosure omits detailed descriptions of well-known functions and well-known components.

[0063] See also Figure 1 , Figure 2 and Figure 3 , an embodiment of the present invention provides a display panel, comprising:

[0064] Base substrate 1;

[0065] The light emitting structure 2 is located on one side of the substrate 1; specifically, the light emitting structure 2 can be a light emitting structure that emits blue light; specifically, combined with Figure 4 , Figure 5 and Figure 6 As shown, the light emitting structure 2 may include a plurality of organic light emitting elements 22 that emit blue light; specifically, the light emitting structure 2 may also include a pixel defining layer 21 having a plurality of pixel defining openings, and the organic light emitting elements 22 may be specifically located in the pixel defining openings of the pixel defining layer 21;

[0066] The light conversion structure 4 is located on the side of the light emitting structure 2 away from the substrate 1, and includes a stacked optical pattern layer 41 and a color conversion layer 42. The optical pattern layer 41 has a plurality of protrusions 410 on the side away from the light emitting structure 2. The color conversion layer 42 converts light emitted from the light emitting structure 2.

[0067] The color filter layer 7 is located on the side of the light conversion structure 4 away from the light emitting structure 2, and has a plurality of color blocks 70, which filter the light converted by the color conversion layer 42. Specifically, the plurality of color blocks may include a red block 71 that only transmits red light, a green block 72 that only transmits green light, and a blue block 73 that only transmits blue light. Specifically, the color blocks 70 may correspond to the organic light emitting element 22 one by one. Specifically, the red block 71 may only transmit red light; the green block 72 may only transmit green light; and the blue block 73 may only transmit blue light.

[0068] In an embodiment of the present invention, the light conversion structure 4 includes an optical pattern layer 41 and a color conversion layer 42 which are stacked. The optical pattern layer 41 has a plurality of protrusions 410 on the side away from the light emitting structure 2. The protrusions 410 can converge the incident light and then emit it, thereby improving the light output efficiency of the optical pattern layer 41, and further improving the light output efficiency of the display panel. By combining the light emitting structure 2 with the color conversion layer 42 and the color film layer 7 to achieve color display, the display panel can have a higher color gamut.

[0069] In one possible implementation, see Figure 7 As shown, the color conversion layer 42 may include a matrix 421 and color conversion particles 422 distributed in the matrix 421; Figure 1-Figure 6 As shown, the light conversion structure 4 further includes a low refractive index layer 43 in contact with the color conversion layer 42 , and the refractive index of the low refractive index layer 43 is smaller than the refractive index of the matrix 421 .

[0070] In the embodiment of the present invention, the light conversion structure 4 also includes a low refractive index layer 43 located in contact with the color conversion layer 42. The refractive index of the low refractive index layer 43 is less than the refractive index of the matrix 421. When the low refractive index layer 43 is located on the side of the color conversion layer 42 away from the light-emitting structure 2, the low refractive index layer 43 can allow part of the light of the light-emitting structure 2 that passes through the color conversion layer 42 to re-enter the color conversion layer 42 through total reflection and excite corresponding photons, thereby improving the conversion rate of the color conversion layer 42; when the low refractive index layer 43 is located between the color conversion layer 42 and the optical pattern layer 41, the low refractive index layer 43 can flatten the optical pattern layer 41 and act as a flat layer.

[0071] In a possible implementation, the refractive index n of the low refractive index layer 43 satisfies: 1.1≤n≤1.4. Specifically, the refractive index n of the low refractive index layer 43 satisfies: 1.3≤n≤1.4. Specifically, the refractive index n of the low refractive index layer 43 may be 1.3. The refractive index n of the low refractive index layer 43 may be 1.4. Specifically, the low refractive index layer 54 may include a matrix layer and an additive, wherein the matrix layer is made of epoxy resin, and the additive layer is SiOx; the thickness of the low refractive index layer 43 may be set to: 30μm to 50μm. Specifically, for example, the thickness of the low refractive index layer 43 may be set to: 35μm to 45μm. Specifically, for example, the thickness of the low refractive index layer 43 is 40μm; specifically, for example, the thickness of the low refractive index layer 43 is 30μm; specifically, for example, the thickness of the low refractive index layer 43 is 50μm.

[0072] Specifically, the effect of the low refractive index layer 43 on the efficiency of the blue light emitting organic light emitting device (simulation results) is as follows: Figure 8 As shown by Figure 8 It can be seen that when the refractive index of the low refractive index layer 43 is n=1.3-1.4 and the film thickness is 30-50 um, the efficiency of the blue organic light emitting device can be improved by more than 10%.

[0073] Specifically, the refractive index n value of the low refractive index layer 43 is set to be 1.3, the film thickness THK is set to be 40 μm, the maximum film thickness THK of the optical pattern layer 41 is set to be 20 μm to 30 μm, and the effect of the optical pattern layer 41 and the low refractive index layer 43 on the efficiency of the blue light emitting device (simulation results) is shown as follows: Fig. 9 As shown by Fig. 9 It can be seen that under this condition, the efficiency of the blue light emitting device can be improved by about 30%; under the above conditions (the refractive index n value of the low refractive index layer 43 is 1.3, the thickness THK is 40μm, and the maximum film thickness THK of the optical pattern layer 41 is 30μm), the brightness of the blue light emitting device (Blue OLED device) changes with the attenuation (L-Decay) of the viewing angle and the CIE color shift trajectory (simulation results) are as follows Fig.10 and Fig.11 As shown by Fig.10 and Fig.11 It is known that, compared with the samples without the optical pattern layer 41 and the low refractive index layer 43, the L-Decay of the Blue OLED device is significantly slower, and the range of color deviation trajectory change is significantly narrowed. This effect is conducive to adjusting the color deviation of the product and optimizing the visual color deviation effect of the product.

[0074] In a possible implementation, the material of the matrix 421 may include at least one of phenolic resin, polyamide resin, polyimide, polyester resin, and polyphenylene resin. Specifically, the refractive index of the matrix 421 may be greater than or equal to 1.50 and less than or equal to 1.65.

[0075] In a specific implementation, the positions of the optical pattern layer 41, the color conversion layer 42, and the low refractive index layer 43 can be flexibly arranged, which is described in detail below.

[0076] In one possible implementation, combining Figure 1 As shown, the low refractive index layer 43 is located on the side of the color conversion layer 42 facing the light emitting structure 2; the optical pattern layer 41 is located on the side of the low refractive index layer 43 facing the light emitting structure 2; and the low refractive index layer 43 is reused as the first flat layer 51. In the embodiment of the present invention, the low refractive index layer 43 is located between the color conversion layer 42 and the optical pattern layer 41, and can flatten the optical pattern layer 41, thus playing the role of a flat layer.

[0077] Specifically, the thickness of the first flat layer 51 can be 20 μm to 40 μm, and the transmittance is ≥ 99%. In the embodiment of the present invention, the first flat layer 51 is provided between the optical pattern layer 41 and the color conversion layer 42 to flatten the upper surface of the optical pattern layer 41 and facilitate the subsequent production of the color conversion layer 42.

[0078] In one possible implementation, combining Figure 2 As shown, the low refractive index layer 43 is located on the side of the color conversion layer 42 away from the light emitting structure 2, and the optical pattern layer 41 is located on the side of the color conversion layer 42 facing the light emitting structure 2. In the embodiment of the present invention, the low refractive index layer 43 is located on the side of the color conversion layer 42 away from the light emitting structure 2, and the optical pattern layer 41 is located on the side of the color conversion layer 42 facing the light emitting structure 2. The low refractive index layer 43 can allow part of the light of the light emitting structure 2 that passes through the color conversion layer 42 to re-enter the color conversion layer 42 through total reflection and excite corresponding photons, thereby improving the conversion rate of the color conversion layer 42.

[0079] In one possible implementation, combining Figure 2 As shown, the optical pattern layer 41 is in direct contact with the color conversion layer 42 .

[0080] In one possible implementation, combining Figure 3 As shown, the low refractive index layer 43 is located on the side of the color conversion layer 42 away from the light emitting structure 2 , and the light pattern layer 41 is located on the side of the low refractive index layer 43 away from the color conversion layer 42 .

[0081] In one possible implementation, combining Figure 3As shown, there is a second flat layer 52 between the optical pattern layer 41 and the color filter layer 7. In the embodiment of the present invention, there is a second flat layer 52 between the optical pattern layer 41 and the color filter layer 7, which can flatten the upper surface of the optical pattern layer 41 to facilitate the subsequent production of the color filter layer 7. Specifically, the thickness of the second flat layer 52 can be: 20μm to 40μm, and the transmittance is ≥99%.

[0082] In a possible implementation, the display panel further includes a black matrix 6 having a plurality of openings 60, the color resist 70 is located in the openings 60, and the orthographic projection of the openings 60 on the base substrate 1 covers the orthographic projection of at least one protrusion 410 on the base substrate 1. Specifically, the orthographic projection area of ​​the protrusion 410 on the base substrate 1 may be smaller than the orthographic projection area of ​​the openings 60 on the base substrate 1, and the orthographic projection area of ​​the protrusion 410 on the base substrate 1 may be located within the orthographic projection of the openings 60 on the base substrate 1. In the embodiment of the present invention, the orthographic projection of the openings 60 on the base substrate 1 covers the orthographic projection of at least one protrusion 410 on the base substrate 1, so as to ensure that each pixel has a protrusion 410 to converge light, thereby improving the light extraction efficiency of each pixel.

[0083] In one possible implementation, see Fig.12 , Fig.13 and Fig.14 As shown, the optical pattern layer 41 includes a plurality of repeating units Z, each repeating unit Z includes a plurality of protrusions 410, and the plurality of protrusions 410 in the same repeating unit Z form a quadrilateral, as shown in FIG. Fig.12 As shown, or multiple protrusions 410 in the same repeating unit Z form a hexagon, such as Fig.13 Specifically, the plurality of protrusions 410 in the same repeating unit Z form a rectangle.

[0084] In one possible implementation, see Fig.12 , Fig.13 and Fig.14 As shown, the shape of the protrusion 410 includes at least one of a hemispherical shape, a conical shape, a quadrangular pyramid shape, and a hexagonal pyramid shape.

[0085] Specifically, the effects of different shapes of the protrusions 410 on the efficiency of the organic light emitting device (Blue OLED device) emitting blue light (simulation results) are as follows: Fig.15 As shown, express Fig.12 The curve showing the effect of the protrusion 410 on the efficiency of the organic light emitting device (Blue OLED device) emitting blue light; express Fig.13 The curve showing the effect of the protrusion 410 on the efficiency of the organic light emitting device (Blue OLED device) emitting blue light; express Fig.14 The curve showing the influence of the protrusion 410 on the efficiency of the organic light emitting device (Blue OLED device) emitting blue light; Fig.15 It can be seen that when the maximum film thickness of the optical pattern layer 41 is THK=20 μm-30 μm, the efficiency of the Blue OLED device can be improved by more than 10% by the optical pattern layer 41 .

[0086] In one possible implementation, combining Figure 1-Figure 6 As shown, the display panel further includes an encapsulation layer 3 between the light emitting structure 2 and the light conversion structure 4. In the embodiment of the present invention, the display panel further includes an encapsulation layer 3 between the light emitting structure 2 and the light conversion structure 4, which can encapsulate the light emitting structure 2 to prevent the light emitting structure 2 from being corroded by external water vapor.

[0087] Specific, combined Figure 3-Figure 6 As shown, the encapsulation layer 3 may include a first inorganic encapsulation layer 301, an organic encapsulation layer 303, and a second inorganic encapsulation layer 302, which are stacked. Specifically, the main material of the first inorganic encapsulation layer 301 may be silicon oxynitride, the film thickness may be set to 0.8um to 1.0um, and the refractive index may be 1.70 to 1.75; the main material of the organic encapsulation layer 303 may be methyl methacrylate, the film thickness may be set to 8um to 12um, and the refractive index may be 1.50 to 1.60; the film thickness of the second inorganic encapsulation layer 302 may be set to 0.5um to 0.8um, and the refractive index may be 1.76 to 1.80; the first inorganic encapsulation layer 301 and the second inorganic encapsulation layer 302 may be prepared by chemical vapor deposition; the organic encapsulation layer 303 may be prepared by inkjet printing.

[0088] In a possible implementation, the color conversion layer 42 is a whole layer of white light quantum dot conversion layer. In the embodiment of the present invention, the color conversion layer 42 is a whole layer of white light quantum dot conversion layer, which simplifies the production process compared with the single-color quantum dot. At the same time, by adjusting the aperture ratio of the black matrix, the high resolution of the product (PPI ≥ 1000) can be achieved.

[0089] In one possible implementation, combining Figure 7 As shown, the color conversion particles 422 may include red quantum dots 4221 and green quantum dots 4222. The red quantum dots 4221 and the green quantum dots 4222 are excited by the organic light emitting element 22 that emits blue light, and are mixed with the blue light emitted by the organic light emitting element 22 to form white light, which is filtered into different primary color lights by the color resistance 70 of the color filter layer 7 above to achieve color display.

[0090] In a possible implementation, the color conversion layer 42 further includes scattering particles 423 distributed in the matrix 421. In the embodiment of the present invention, by adding the scattering particles 423 to the color conversion layer 42, the light output of the color conversion layer 42 can be made uniform.

[0091] In a possible implementation, the mass ratio of the red quantum dots 4221 to the green quantum dots 4222 is in the range of 0.8:1 to 1:1; the mass ratio of the scattering particles 423 to the red quantum dots 4221 is in the range of 1:8 to 1:10. Specifically, the concentration of the red quantum dots 4221, the concentration of the green quantum dots 4222, and the concentration of the scattering particles 423 when printing and forming the color conversion layer 42 can be controlled to be 8% to 10%, 8% to 12%, and 1% to 2% to meet the color gamut BT2020 specification.

[0092] In specific implementation, the color gamut and color coordinates of the white light quantum dot conversion layer (W-QD) are as follows: Fig.16 As shown in Table 1. As can be seen from the chart, the color gamut of only the white light quantum dot conversion layer only reaches 90% of BT20220. In order to further improve its color purity, it is necessary to add a color filter layer 7 (CF) above the white light quantum dot conversion layer; the color gamut and color coordinate simulation results of the W-QD+CF sample are shown in Fig.17 As shown in Table 2, it can be seen from the chart that the color gamut of the W-QD+CF sample can meet the color gamut specification of BT2020.

[0093] Table 1

[0094] Classification Rx R Gx Gy Bx By Color gamut BT2020 0.708 0.292 0.170 0.797 0.131 0.046 100％ W-QD Sample 0.694 0.273 0.172 0.743 0.140 0.046 90％

[0095] Table 2

[0096]

[0097] In one possible implementation, combining Figure 3 , Figure 4 and Figure 5 As shown, the display panel further includes a pixel defining layer 21 having a plurality of pixel defining openings, and the organic light emitting elements 22 are located in the pixel defining openings.

[0098] In a possible implementation, the organic light emitting element 22 may include a plurality of sub-light emitting elements 20 which are sequentially stacked and located on one side of the base substrate 1. Specifically, for example, Fig.18As shown, the organic light-emitting element 22 includes two stacked sub-light-emitting elements 20. Specifically, the organic light-emitting element 22 may include: a first anode 201, a first hole injection layer 202, a first hole transport layer 203, a second hole transport layer 204, a first organic light-emitting layer 205, a first electron transport layer 206, a first charge generation layer 207, a third hole transport layer 208, a second organic light-emitting layer 209, a second electron transport layer 210, and a first cathode 211, which are sequentially located on one side of the substrate 1; or, for example, Fig.19 As shown, the organic light-emitting element 22 includes three stacked sub-light-emitting elements 20. Specifically, the light-emitting element 2 may include: a second anode 212, a second hole injection layer 213, a fourth hole transport layer 214, a fifth hole transport layer 215, a third organic light-emitting layer 216, a third electron transport layer 217, a second charge generation layer 218, a sixth hole transport layer 219, a fourth organic light-emitting layer 220, a fourth electron transport layer 221, a third charge generation layer 222, a seventh hole transport layer 223, a fifth organic light-emitting layer 224, and a second cathode 225, which are sequentially located on one side of the base substrate 1.

[0099] In a possible implementation, the material of the first anode 201 or the second anode 212 may be ITO / Ag / ITO. The material of the first pixel defining layer 21 may be polyimide. The material of the base substrate 1 may be polyimide.

[0100] In a possible implementation, the display panel may include a pixel circuit located between the base substrate 1 and the organic light emitting element 22 for driving the organic light emitting element 22 to emit light. The pixel circuit may include a thin film transistor and a capacitor. Fig. 20 As shown, the thin film transistor may include a buffer layer 102 (the material may be SiOx and / or SiNx), an active layer 103 (the material may be p-Si formed by a-Si through a laser annealing process), a gate insulating layer 104 (the material may be SiOx and / or SiNx), a gate 105 (the material may be Mo or Cu), an interlayer dielectric layer 106 (the material may be SiOx and / or SiNx), a source-drain layer (may include a source 1071 and a drain 1072), and a planar layer 108 (the material may be polyimide), which are sequentially located on one side of the substrate 1.

[0101] An embodiment of the present invention further provides a display device, including the display panel provided by the embodiment of the present invention.

[0102] See also Fig.21 As shown, the embodiment of the present invention further provides a method for manufacturing a display panel provided by the embodiment of the present invention, comprising:

[0103] Step S100, providing a substrate;

[0104] Step S200, forming a light emitting structure on one side of the base substrate;

[0105] Step S300, forming a light conversion structure on a side of the light emitting structure away from the substrate, wherein the light conversion structure includes a stacked optical pattern layer and a color conversion layer, and the optical pattern layer has a plurality of protrusions on a side away from the backlight emitting layer; the color conversion layer converts light emitted from the light emitting structure; specifically, a whole layer of white light quantum dot conversion layer can be formed as the color conversion layer by spin coating or printing;

[0106] Step S400: forming a color filter layer on a side of the light conversion structure away from the light emitting structure.

[0107] In the embodiment of the present invention, an open mask can be used to make an organic light-emitting device (Blue OLED) device that emits blue light, and then encapsulate it through thin film encapsulation technology, make an optical pattern layer (optical pattern layer) above the encapsulation layer, and make a low refractive index layer (Low RI film layer) above the optical pattern layer. The above two layers can enhance the front light of the product and reduce total reflection, thereby improving the luminous efficiency of the display panel. A white light quantum dot layer (W-QD) is made by spin coating or printing on the low refractive index layer, and then a black matrix Black Matrix (BM) layer is set on it and an RGB color filter layer (Color filter, CF) is filled in it to improve the color purity of the product. At the same time, by adjusting the aperture ratio of the BM, a high-resolution (PPI ≥ 1000) product can be achieved.

[0108] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A display panel, characterized in that: include: substrate substrate; A light emitting structure, wherein the light emitting structure is located on one side of the base substrate; A light conversion structure, the light conversion structure is located on a side of the light emitting structure away from the base substrate, and includes a stacked optical pattern layer and a color conversion layer, and a low refractive index layer located on a side of the color conversion layer facing the light emitting structure; The optical pattern layer is located on the side of the low refractive index layer facing the light emitting structure; the optical pattern layer has a plurality of protrusions on the side away from the light emitting structure; the color conversion layer is a whole layer of white light quantum dot conversion layer, the color conversion layer includes a matrix and color conversion particles distributed in the matrix, and the color conversion layer converts the light emitted by the light emitting structure; the refractive index of the low refractive index layer is less than the refractive index of the matrix, and the refractive index n of the low refractive index layer satisfies: 1.1≤n≤1.4, and the low refractive index layer is reused as the first flat layer; A color filter layer is located on a side of the light conversion structure away from the light emitting structure and has a plurality of color resists, and the color resists filter the light converted by the color conversion layer.

2. The display panel according to claim 1, wherein: The low refractive index layer is in contact with the color conversion layer.

3. The display panel according to claim 1 or 2, characterized in that: The display panel further comprises a black matrix having a plurality of openings, and the color resist is located in the openings; The orthographic projection of the opening on the base substrate covers the orthographic projection of at least one of the protrusions on the base substrate.

4. The display panel according to claim 3, wherein: The optical pattern layer includes a plurality of repeating units, each of the repeating units includes a plurality of protrusions, and the plurality of protrusions of the same repeating unit form a quadrilateral or a hexagon.

5. The display panel according to claim 4, wherein: The shape of the protrusion includes at least one of a hemispherical shape, a conical shape, a quadrangular pyramid shape, and a hexagonal pyramid shape.

6. The display panel according to claim 1 or 2, characterized in that: The display panel further includes an encapsulation layer located between the light emitting structure and the light conversion structure.

7. The display panel according to claim 6, wherein: The encapsulation layer includes a first inorganic encapsulation layer, an organic encapsulation layer and a second inorganic encapsulation layer which are stacked.

8. The display panel according to claim 1, wherein: The color conversion particles include red quantum dots and green quantum dots.

9. The display panel according to claim 8, wherein: The color conversion layer also includes scattering particles distributed in the matrix.

10. The display panel according to claim 9, wherein: The mass ratio of the red quantum dots to the green quantum dots is in the range of 0.8:1 to 1:1; the mass ratio of the scattering particles to the red quantum dots is in the range of 1:8 to 1:

10.

11. The display panel according to claim 1 or 2, characterized in that: The light emitting structure includes a plurality of organic light emitting elements corresponding to the color resists one by one and emitting blue light.

12. The display panel according to claim 11, wherein: The display panel further includes a pixel defining layer having a plurality of pixel defining openings, and the organic light emitting element is located in the pixel defining openings.

13. A display device, characterized in that: Comprising the display panel as described in any one of claims 1-12.

14. A method for manufacturing a display panel according to any one of claims 1 to 12, characterized in that: include: Providing a substrate; A light emitting structure is formed on one side of the base substrate: A light conversion structure is formed on a side of the light emitting structure away from the base substrate, wherein the light conversion structure comprises an optical pattern layer and a color conversion layer which are stacked, and the optical pattern layer has a plurality of protrusions on a side away from the light emitting structure; and the color conversion layer converts light emitted from the light emitting structure; A color filter layer is formed on a side of the light conversion structure away from the light emitting structure.

15. The manufacturing method according to claim 14, characterized in that: The light conversion structure is formed on a side of the light emitting structure away from the substrate, comprising: By spin coating or printing, a whole layer of white light quantum dot conversion layer is formed as the color conversion layer.

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