Display panel and display device

Abstract

The application discloses a display panel and a display device, wherein the display panel comprises a light-emitting substrate, a first surface of the light-emitting substrate is provided with a plurality of micro light-emitting chips, and a quantum dot film is attached to a second surface of the light-emitting substrate. Through the above structure, the display effect of the display panel is improved.

Description

Technical Field

[0001] This invention relates to the field of display panels, and more particularly to display panels and display devices. Background Technology

[0002] Currently, due to the excellent properties of quantum dot (QD) materials, such as high color purity and continuously tunable spectrum, they have become the most outstanding light-emitting materials of the 21st century. They can significantly improve the color performance of existing liquid crystal displays in terms of color gamut, and therefore their display applications have been widely studied in recent years.

[0003] Due to the difficulty of growing three-color chips on a single epitaxial layer and the low luminous efficiency of red chips, microdisplay devices typically employ a structure of blue light-emitting chips superimposed with red and green quantum dots. However, quantum dot materials are unstable and have a short lifespan due to environmental influences.

[0004] In the existing technology, quantum dot films are attached to the surface of micro-display devices. However, due to the influence of the manufacturing process, there is a certain height difference on the surface of the micro-display device. Therefore, the light-emitting surface after the quantum dot film is attached will be uneven, which will affect the display effect. Utility Model Content

[0005] The main technical problem addressed by this application is to provide a display panel and display device that solves the problem of unevenness on the light-emitting surface of the display panel and improves the display effect.

[0006] To address the aforementioned issues, this application provides a display panel in a first aspect, comprising: a light-emitting substrate having a plurality of micro-light-emitting chips disposed on a first side; a quantum dot film attached to a second side of the light-emitting substrate; wherein the second side of the light-emitting substrate is disposed opposite to the first side of the light-emitting substrate; and the quantum dot film is a flexible film.

[0007] The quantum dot film includes: a substrate; a black matrix layer disposed on one side surface of the substrate and having a plurality of first grooves facing away from the substrate; a dimming structure disposed in each of the first grooves and having a second groove facing away from the substrate; a quantum dot layer including red quantum dots, green quantum dots and a transparent filling layer, filling the second grooves; and an encapsulation layer covering the side surface of the quantum dot layer away from the substrate.

[0008] The first groove is a rectangular groove; the second groove tapers in a gradually narrowing shape along the light-emitting surface.

[0009] The second groove is a frustum-shaped groove.

[0010] The second groove is a frustum-shaped groove.

[0011] The black matrix layer has a black film layer on one side near the substrate, and the black film layer is made of the same material as the black matrix layer; the thickness of the black film layer is less than 10 μm.

[0012] The refractive index of the dimming structure is less than that of the quantum dot layer.

[0013] The micro-light-emitting chip has a reflective layer on the surface away from the light-emitting substrate.

[0014] To address the aforementioned issues, this application provides a display device in a second aspect, wherein the display device includes the display panel described in any of the above embodiments, and wherein a plurality of micro-light-emitting chips in the light-emitting substrate are correspondingly disposed with a plurality of quantum dots in the quantum dot film.

[0015] The light-emitting substrate includes multiple strip-shaped light-emitting substrates, and the splicing gaps of the strip-shaped light-emitting substrates are arranged to correspond to the black matrix of the quantum dot film.

[0016] The beneficial effects of this application are: by attaching the quantum dot film to the back of the light-emitting substrate and cooperating with the bottom-emitting light-emitting substrate, the flatness of the quantum dot film attachment is ensured, thereby ensuring the flatness of the light-emitting surface of the display panel, improving the light-emitting effect of the display, and thus improving the display effect of the display panel. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of the first embodiment of the display panel provided in this application; Figure 2 This is a schematic diagram of the structure of an embodiment of the quantum dot film provided in this application; Figure 3 This is a schematic diagram of an embodiment of the dimming structure provided in this application; Figure 4 A top view of an embodiment of the quantum dot film provided in this application; Figure 5 A schematic diagram of the structure of an embodiment of the method for manufacturing a display panel provided in this application; Figure 6 For this application Figure 5 A flowchart illustrating a specific embodiment of step S12; Figure 7 For this application Figure 5 A schematic diagram of the structure of a specific embodiment of step S12; Figure 8 This is a schematic diagram of the structure of the second embodiment of the display panel provided in this application; Figure 9 This is a schematic diagram of a specific embodiment of the curved display panel provided in this application.

[0019] Light-emitting substrate 10; quantum dot film 20; micro light-emitting chip 11; reflective layer 12; substrate 21; black matrix layer 22; dimming structure 23; quantum dot layer 24; encapsulation layer 25; first groove 201; second groove 202; black film layer 221. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to limit the application. The singular forms “a,” “said,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms, unless otherwise clearly indicated above. “Multiple” generally includes at least two, but does not exclude the inclusion of at least one.

[0022] It should be understood that the term "and / or" used herein is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Furthermore, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship. The terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0023] It should be understood that the terms "comprising," "including," or any other variations used herein are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0024] It should be noted that the first and second access terminals of the transistor in this application are the source and drain of the transistor, respectively, and the control terminal is the gate of the transistor. The source and drain are not limited; the first access terminal can be the source, or the second access terminal can be the source.

[0025] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in every place in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0026] This application provides a display panel; please refer to the details. Figure 1 , Figure 1 This is a schematic diagram of the structure of an embodiment of the display panel provided in this application. Figure 1 As shown, the display panel includes a light-emitting substrate 10 and a quantum dot film 20. The first surface of the light-emitting substrate 10 is provided with multiple micro-light-emitting chips 11 to form a light source panel with light-emitting function. The quantum dot film 20 is attached to the second surface of the light-emitting substrate 10 to ensure the flatness of the quantum dot film 20.

[0027] Among them, quantum dot film 20 is a soft film that is prone to deformation.

[0028] Compared to existing technologies that attach the quantum dot film 20 to the first surface of the light-emitting substrate 10, the first surface of the light-emitting substrate 10 has a certain height difference due to the manufacturing process, and the quantum dot film is a soft film. Therefore, after attaching the quantum dot film to the light-emitting substrate, the light-emitting surface of the display panel will be uneven, thus affecting the display effect. This application attaches the quantum dot film to the substrate surface on the non-light-emitting chip side, making the surface of the light-emitting surface flat after attachment, thus improving the light emission effect.

[0029] In this embodiment, the light-emitting substrate 10 includes a glass substrate to facilitate light transmission. A reflective layer 12 is also provided on the surface of the micro-light-emitting chip 11 facing away from the light-emitting substrate 10 to ensure the amount of light emitted by the light-emitting substrate 10. The reflective layer 12 is mainly used to reflect a portion of the light reflected by the glass substrate, thereby ensuring the amount of light emitted.

[0030] In this embodiment, the micro light-emitting chip 11 can be a micro blue light-emitting chip, and the micro light-emitting chip 11 is a bottom light-emitting chip.

[0031] Further, please refer to Figure 2 , Figure 2 This is a schematic diagram of the structure of an embodiment of the quantum dot film provided in this application. Figure 2 As shown, in this embodiment, the quantum dot film 20 specifically includes a substrate 21. A black matrix layer 22 is disposed on one side surface of the substrate 21 and has multiple first grooves 201 facing away from the substrate 21. A dimming structure 23 is disposed in each first groove 201 and has a second groove 202 facing away from the substrate 21. The size of the second groove 202 is smaller than the size of the first groove 201. The quantum dot layer 24 includes multiple quantum dots, specifically red quantum dots, green quantum dots, and a transparent filler layer. Different quantum dots are filled in different second grooves 202 to form the quantum dot layer 24. An encapsulation layer 25 covers the surface of the quantum dot layer 24 away from the substrate 21 to encapsulate and fix the quantum dot layer 24 between the substrate 21 and the encapsulation layer 25.

[0032] The first groove 201 is a rectangular groove.

[0033] In one specific embodiment, the second groove 202 is a frustum-shaped groove. In another specific embodiment, the second groove 202 is a frustum-shaped groove. Please refer to the following for details. Figure 3 , Figure 3 This is a schematic diagram of an embodiment of the dimming structure provided in this application. Figure 3 As shown in Figure a, the surface of the dimming structure 23 away from the substrate 21 is a hemispherical arc surface, which also forms a second groove 202 in the shape of a frustum, as shown in Figure a. Figure 3 As shown in Figure b, the second groove 202 is a frustum-shaped groove. Figure 3 As shown, the diameter of the second groove 202 gradually decreases along the light-emitting surface direction X, that is, it is tapered. The opening / diameter of the second groove 202 on the side closer to the substrate 21 is smaller than that on the side farther from the substrate 21, which allows the emitted light to be focused. In this embodiment, the refractive index of the dimming structure 23 is less than that of the quantum dot layer 24, which further focuses the emitted light.

[0034] Further reading Figure 4 , Figure 4 This is a top view schematic diagram of an embodiment of the quantum dot film provided in this application. Figure 4 As shown, the multiple quantum dots in the quantum dot layer 24 are circular on the projection surface of the substrate 21.

[0035] In this embodiment, the substrate 21 is a transparent flexible substrate. In other embodiments, it may be other flexible boards, which are not limited here.

[0036] In this embodiment, a black film layer 221 is also provided on one side of the black matrix layer 22 near the substrate 21. The black film layer 221 is made of the same material as the black matrix layer 22. Specifically, the black film layer 221 covers the entire surface of the substrate 21, including the positions corresponding to the quantum dots. It can be fabricated together with the black matrix layer 22. Specifically, a portion of the black film can be reserved at the bottom of the first groove 201 during the fabrication of the black matrix layer 22 to form the black film layer 221. The thickness of the black film layer 221 is less than 10 μm. By forming a black film layer 221 in the light-emitting surface direction X, a unified black effect can be achieved on the light-emitting surface, reducing the reflection of ambient light and preventing ambient light from affecting the display effect of the display panel. The black film layer 221 should not be too thick, otherwise it will affect the light emission of the light-emitting surface and also affect the display effect of the display panel.

[0037] In this embodiment, the quantum dot film 20 is equivalent to a color filter substrate.

[0038] This application also provides a method for manufacturing a display panel; please refer to the details below. Figure 5 , Figure 5 This is a schematic diagram of the structure of an embodiment of the method for manufacturing a display panel provided in this application. Figure 5 As shown, the manufacturing method includes: Step S11: Provide a light-emitting substrate with a micro light-emitting chip disposed on the front side.

[0039] The light-emitting substrate is preferably a glass substrate, which has better flatness, and the micro light-emitting chip on its front side can be a blue light-emitting chip. The light-emitting surface of the light-emitting substrate is the back side of the light-emitting substrate.

[0040] This step specifically includes: providing a glass substrate; fabricating or encapsulating multiple micro-light-emitting chips on the front side of the glass substrate. The micro-light-emitting chips are arranged in an array.

[0041] This step also includes attaching a reflective layer to the surface of the micro-light-emitting chip on the side facing away from the glass substrate.

[0042] Step S12: Fabrication of quantum dot film.

[0043] Please refer to the details. Figure 6 and Figure 7 , Figure 6 For this application Figure 5 A flowchart illustrating a specific embodiment of step S12. Figure 7 For this application Figure 5 A schematic diagram of the structure of a specific embodiment of step S12. (See diagram below.) Figure 6 As shown, step S12 specifically includes: Step S21: Provide a substrate.

[0044] The substrate is a flexible transparent plate. For details, please refer to [link / reference needed]. Figure 7 As shown in Figure a.

[0045] Step S22: Coat the substrate surface with a black resin layer.

[0046] The black resin layer has a certain thickness and provides light-blocking functionality. For details, please refer to [reference needed]. Figure 7 As shown in b.

[0047] Step S23: Use the first embossing mold to emboss the black resin layer into a black matrix layer with the first groove.

[0048] Specifically, a first imprinting mold is designed based on the size and spacing of the micro-light-emitting chips. The black resin layer is imprinted using the first imprinting mold to obtain the black matrix layer. For detailed structure, please refer to [reference needed]. Figure 7 As shown in c.

[0049] The height of the raised structure of the first imprinting mold is less than the height (thickness) of the black resin layer along the direction perpendicular to the substrate, so as to leave a portion of the black resin layer at the bottom of the first groove to form a black film layer. The raised structure of the first imprinting mold is rectangular, so as to imprint a rectangular first groove.

[0050] The black film layer, with a thickness of less than 10μm, reduces ambient light reflection into the panel while maintaining its light transmittance. This process is simpler than the conventional method of creating the blackening layer after encapsulation.

[0051] Step S24: Fill the first groove with transparent resin.

[0052] The transparent resin is used to form the dimming structure. The refractive index of the transparent resin is lower than that of the quantum dot layer material. The amount of transparent resin used is calculated based on the equivalent volume of the formed dimming structure. Specifically, the volume of the transparent resin is equal to the volume of the black matrix groove (first groove) minus the volume of each quantum dot. The transparent resin is liquid when filled into the first groove and can solidify at a certain temperature to form a dimming structure of a specific shape. Please refer to [link / reference] for details. Figure 7 As shown in d.

[0053] Step S25: Use the second embossing mold to emboss the transparent resin into a dimming structure with a second groove.

[0054] In this design, the size of the raised structure of the second imprinting mold is smaller than the size of the first groove. Specifically, the height of the second imprinting mold in the direction perpendicular to the substrate is smaller than the width of the first groove in the same direction, and the width of the second imprinting mold in the direction parallel to the substrate is also smaller than the size of the first groove, to avoid the second imprinting mold affecting the structure of the first groove due to alignment accuracy. Preferably, the size of the raised structure of the second imprinting mold is 10% smaller than the size of the first groove, that is, the size of the raised structure of the second imprinting mold is 90% of the size of the first groove.

[0055] The second imprinting mold is designed based on the size and spacing of the micro-light-emitting chips. Please refer to [link / reference] for details. Figure 7 As shown in e.

[0056] The opening diameter of the second groove in the dimming structure is larger than the bottom diameter of the second groove. Specifically, it can be a frustum-shaped groove or a pyramid-shaped groove.

[0057] Step S26: Fill each second groove with quantum dots and solidify to form a quantum dot layer.

[0058] Specifically, different quantum dots are filled in adjacent second grooves. See [link to details] for further information. Figure 7 As shown in f.

[0059] The quantum dots include red quantum dots, green quantum dots, and a transparent filler layer. The transparent filler layer is also made of transparent resin. The resin material of the transparent filler layer differs from that of the light-switching structure, and their refractive indices are also different. The refractive index of the resin material in the light-switching structure is lower than that of the red quantum dots, green quantum dots, and the resin material of the transparent filler layer.

[0060] The materials used for the red quantum dots, green quantum dots, and transparent filler layer are all resin materials, which can be cured under certain temperature or light conditions.

[0061] In this embodiment, red quantum dots, green quantum dots, and a transparent filler layer can be sequentially filled side-by-side in rows or columns. In another embodiment, steps S25 and S26 can be performed alternately to fabricate red quantum dots, green quantum dots, and a transparent filler layer. Specifically, a second imprinting mold is first used to imprint a corresponding red groove area based on a row or column of micro-light-emitting chips, and red quantum dots are filled in the red groove area; then the green groove area is imprinted again, and green quantum dots are filled in the green groove area; then the transparent groove area is imprinted again, and a transparent filler layer is filled in the transparent groove area, thereby completing the fabrication of different quantum dots.

[0062] Step S27: Attach an encapsulation layer to the surface of the quantum dot layer away from the substrate.

[0063] The encapsulation layer is used to encapsulate quantum dots within a substrate; see details for further information. Figure 7 As shown in g.

[0064] Step S13: Attach the quantum dot film to the back of the light-emitting substrate to form a display panel.

[0065] The back side of the light-emitting substrate is the side opposite to the front side of the light-emitting substrate.

[0066] This step specifically includes: attaching the side of the quantum dot film with the encapsulation layer facing the back of the light-emitting substrate. This can be achieved using an adhesive layer.

[0067] The quantum dot film in this application can also be used to splice together small-sized light-emitting substrates such as strip substrates. See details in [link to relevant documentation]. Figure 8 , Figure 8 This is a schematic diagram of the structure of the second embodiment of the display panel provided in this application. Figure 8 As shown, a large-size quantum dot film 20 is used as the splicing substrate. The strip-shaped light-emitting substrate 10 is aligned and attached to the quantum dot film 20 to complete the splicing fabrication of the large-size light-emitting substrate, resulting in a large-size display panel. The splicing gaps of the strip-shaped light-emitting substrate 10 correspond to the black matrix arrangement of the quantum dot film 20. The multiple micro-light-emitting chips of the strip-shaped light-emitting substrate 10 correspond to the multiple quantum dot arrangements of the quantum dot film 20.

[0068] Furthermore, flexible splicing based on quantum dot films enables the application of curved surface light sources. Please refer to [link / reference] for details. Figure 9 , Figure 9 This is a schematic diagram of a specific embodiment of the curved display panel provided in this application. Figure 9 As shown, multiple small-sized strip-shaped light-emitting substrates 10 are bonded to the backlight side of the quantum dot film 20. These small-sized light-emitting substrates 10 can be tightly joined or joined according to preset spacing requirements. Specifically, the small-sized light-emitting substrates 10 can be made into curved light sources with different curvatures according to a matching curved backplate, thus having a wider range of applications. The curved display panel is bent towards the light-emitting surface.

[0069] The beneficial effects of this application are: by attaching the quantum dot film to the back of the light-emitting substrate and cooperating with the bottom-emitting light-emitting substrate, the flatness of the quantum dot film attachment is ensured, thereby ensuring the flatness of the light-emitting surface of the display panel, improving the light-emitting effect of the display, and thus improving the display effect of the display panel.

[0070] The above are merely embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A display panel, characterized in that, The display panel includes: A light-emitting substrate, wherein a plurality of micro light-emitting chips are disposed on the first side of the light-emitting substrate; A quantum dot film is attached to the second surface of the light-emitting substrate; wherein the second surface of the light-emitting substrate is disposed opposite to the first surface of the light-emitting substrate; the quantum dot film is a flexible film. The quantum dot film comprises: substrate; A black matrix layer is disposed on one side surface of the substrate and has a plurality of first grooves disposed opposite to the substrate. A dimming structure is disposed in each of the first grooves and has a second groove disposed opposite to the substrate; A quantum dot layer, comprising red quantum dots, green quantum dots, and a transparent filler layer, is filled within the second groove; An encapsulation layer covers the side of the quantum dot layer away from the substrate.

2. The display panel according to claim 1, characterized in that, The first groove is a rectangular groove; the second groove tapers in a gradually narrowing shape along the light-emitting surface.

3. The display panel according to claim 2, characterized in that, The second groove is a frustum-shaped groove.

4. The display panel according to claim 2, characterized in that, The second groove is a frustum-shaped groove.

5. The display panel according to claim 1, characterized in that, A black film layer is also provided on one side of the black matrix layer near the substrate. The black film layer is made of the same material as the black matrix layer. The thickness of the black film layer is less than 10 μm.

6. The display panel according to claim 1, characterized in that, The refractive index of the dimming structure is less than that of the quantum dot layer.

7. The display panel according to claim 1, characterized in that, A reflective layer is also provided on the surface of the micro light-emitting chip on the side away from the light-emitting substrate.

8. A display device, the display device comprising the display panel according to any one of claims 1 to 7; in, The multiple micro-light-emitting chips in the light-emitting substrate are correspondingly arranged with the multiple quantum dots in the quantum dot film.

9. The display device according to claim 8, characterized in that, The light-emitting substrate includes multiple strip-shaped light-emitting substrates, and the splicing gaps of the strip-shaped light-emitting substrates are arranged to correspond to the black matrix of the quantum dot film.

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