Display panel and display device

Abstract

The application discloses a display panel and a display device, wherein the light emitting element and the quantum dot color conversion film are arranged in the sub-pixel opening, and the orthographic projection of the quantum dot color conversion film on the driving back plate and the orthographic projection of the light emitting element on the driving back plate do not overlap each other, so that the light emitting element and the quantum dot color conversion film are horizontally arranged in the same sub-pixel opening, the light emitted by the light emitting element can be prevented from entering the adjacent sub-pixel opening, the problem of light crosstalk caused by the upper and lower layer arrangement of the quantum dot color conversion film and the light emitting element in the related art is solved, and the color purity and the display color gamut of the display panel are improved.

Description

Technical Field

[0001] This invention relates to the field of display technology, and more particularly to a display panel and display device. Background Technology

[0002] Quantum dot (QD) materials have a very narrow full width at half maximum (FWHM) emission spectrum. Therefore, QD has potential application value in the fields of photoluminescent and electroluminescent displays. QD-OLED (a display combining quantum dot and organic light-emitting diode technology) is a typical example of photoluminescent display using QD materials. However, most common QD-OLED devices currently use stacked QD and OLED layers. The light emission direction of the OLED is not fixed; it can emit light vertically or diverge at different angles. Due to the presence of encapsulation layers, planarization layers, etc., between the OLED and QD, the large-angle light emitted by the OLED undergoes continuous refraction and reflection in these layers and enters the QD layer of adjacent sub-pixels. This can easily cause crosstalk between sub-pixels, reducing the color purity and display color gamut of the screen. Summary of the Invention

[0003] The present invention provides a display panel and display device to solve the problem of color bleeding in the display panel, thereby improving the color purity and display color gamut of the display panel.

[0004] This invention provides a display panel, comprising:

[0005] Drive backplane;

[0006] A retaining wall structure is located on the drive backplate, and the retaining wall structure has multiple sub-pixel openings;

[0007] Multiple light-emitting elements are respectively located within the opening of each sub-pixel;

[0008] Multiple quantum dot color conversion films are provided, wherein at least some of the sub-pixel openings are provided with the quantum dot color conversion film, and the orthographic projection of the quantum dot color conversion film on the driving back plate does not overlap with the orthographic projection of the light-emitting element on the driving back plate.

[0009] Optionally, the display panel provided in the embodiments of the present invention further includes a first metal reflective layer, which at least covers the sidewall of the retaining wall structure.

[0010] Optionally, in the display panel provided in the embodiments of the present invention, the first metal reflective layer also covers the top surface of the barrier structure on the side opposite to the drive back plate.

[0011] Optionally, the display panel provided in the embodiments of the present invention further includes a second metal reflective layer located between the driving backplate and the quantum dot color conversion film, wherein the orthographic projection of the second metal reflective layer on the driving backplate does not overlap with the orthographic projection of the light-emitting element on the driving backplate.

[0012] Optionally, in the display panel provided in the embodiments of the present invention, the second metal reflective layer and the first metal reflective layer are an integral structure.

[0013] Optionally, the display panel provided in the embodiments of the present invention further includes: a first planarization layer located between the first metal reflective layer and the quantum dot color conversion film and covering the light-emitting element, and a third metal reflective layer located on the side of the first metal reflective layer and the first planarization layer facing away from the driving back plate, wherein the surface of the third metal reflective layer facing away from the driving back plate is flush with the surface of the quantum dot color conversion film facing away from the driving back plate.

[0014] Optionally, in the display panel provided in the embodiments of the present invention, the surface of the first flat layer facing away from the driving back plate is flush with the surface of the first metal reflective layer facing away from the driving back plate.

[0015] Optionally, in the display panel provided in the embodiments of the present invention, the surface of the first flat layer facing away from the driving back plate is an inclined surface; within the same sub-pixel opening, along the direction from the first metal reflective layer to the quantum dot color conversion film, the distance from the inclined surface to the driving back plate gradually increases.

[0016] Optionally, in the display panel provided in the embodiments of the present invention, the thicknesses of the first metal reflective layer, the second metal reflective layer, and the third metal reflective layer are all greater than or equal to 50 nm.

[0017] Optionally, in the display panel provided in the embodiments of the present invention, the first flat layer contains a plurality of scattering particles.

[0018] Optionally, in the display panel provided in the embodiments of the present invention, the distance between the surface of the barrier structure facing away from the driving back plate and the surface of the light-emitting element facing away from the driving back plate is greater than or equal to 2 μm.

[0019] Optionally, in the display panel provided in the embodiments of the present invention, the material of the barrier structure is an absorbent material or a reflective material.

[0020] Optionally, in the display panel provided in the embodiments of the present invention, the barrier structure and the first metal reflective layer are an integral structure.

[0021] Optionally, in the display panel provided in the embodiments of the present invention, the barrier structure, the first metal reflective layer and the third metal reflective layer are an integral structure.

[0022] Optionally, in the display panel provided in the embodiments of the present invention, the light-emitting element emits blue light, the sub-pixel opening includes a first sub-pixel opening, a second sub-pixel opening and a third sub-pixel opening, a red quantum dot color conversion film is disposed in the first sub-pixel opening, a green quantum dot color conversion film is disposed in the second sub-pixel opening, and the third sub-pixel opening is filled with resin material, the resin material contains scattering particles, and the orthographic projection of the resin material on the driving backplate does not overlap with the orthographic projection of the light-emitting element on the driving backplate.

[0023] Optionally, in the display panel provided in the embodiments of the present invention, the light-emitting element includes: a P-type semiconductor layer, an N-type semiconductor layer, a light-emitting layer located between the P-type semiconductor layer and the N-type semiconductor layer, a first electrode, and a second electrode; the first electrode and the second electrode are electrically connected to the driving backplate, and the light-emitting surface of the N-type semiconductor layer is parallel to the plane of the substrate of the driving backplate.

[0024] Optionally, in the display panel provided in the embodiments of the present invention, the light-emitting element includes: a P-type semiconductor layer, an N-type semiconductor layer, a light-emitting layer located between the P-type semiconductor layer and the N-type semiconductor layer, a first electrode, and a second electrode; the first electrode and the second electrode are electrically connected to the driving backplate, and the light-emitting surface of the N-type semiconductor layer faces the quantum dot color conversion film.

[0025] Optionally, in the display panel provided in the embodiments of the present invention, the driving backplane includes: a substrate, a driving circuit located on the side of the substrate facing the light-emitting element, a second planarization layer located on the side of the driving circuit facing the light-emitting element, a third electrode and a fourth electrode located on the side of the second planarization layer facing the light-emitting element, and a passivation layer located on the side of the third electrode and the fourth electrode facing the light-emitting element; the third electrode is electrically connected to the driving circuit through a via penetrating the second planarization layer, and the fourth electrode is grounded;

[0026] The first electrode is electrically connected to the third electrode through a via penetrating the passivation layer, and the second electrode is electrically connected to the fourth electrode through a via penetrating the passivation layer.

[0027] Optionally, the display panel provided in the embodiments of the present invention further includes: an encapsulation layer located on the side of the quantum dot color conversion film away from the driving backplate, and a color filter layer located on the side of the encapsulation layer away from the driving backplate; the color filter layer includes a plurality of color filters corresponding one-to-one with the quantum dot color conversion film.

[0028] Optionally, in the display panel provided in the embodiments of the present invention, the light-emitting element includes Mini LED or Micro LED.

[0029] Accordingly, embodiments of the present invention also provide a display device, including the display panel described in any of the above embodiments of the present invention.

[0030] The beneficial effects of the embodiments of the present invention are as follows:

[0031] The present invention provides a display panel and display device, which, by placing both the light-emitting element and the quantum dot color conversion film within the sub-pixel opening, and ensuring that the orthographic projection of the quantum dot color conversion film on the driving backplate does not overlap with the orthographic projection of the light-emitting element on the driving backplate, allows the light-emitting element and the quantum dot color conversion film to be arranged horizontally within the same sub-pixel opening. This avoids light emitted by the light-emitting element from entering the openings of adjacent sub-pixels, thus solving the problem of light crosstalk that occurs when the quantum dot color conversion film and the light-emitting element are stacked vertically in related technologies, thereby improving the color purity and display color gamut of the display panel. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of a planar structure of a display panel provided in an embodiment of the present invention;

[0033] Figure 2 for Figure 1 A schematic diagram of a cross-sectional structure along the CC' direction;

[0034] Figure 3 for Figure 1 A schematic diagram of another cross-sectional structure along the CC' direction;

[0035] Figure 4 for Figure 1 A schematic diagram of another cross-sectional structure along the CC' direction;

[0036] Figure 5 for Figure 1 A schematic diagram of another cross-sectional structure along the CC' direction;

[0037] Figure 6 for Figure 1 A schematic diagram of another cross-sectional structure along the CC' direction;

[0038] Figure 7 for Figure 1A schematic diagram of another cross-sectional structure along the CC' direction;

[0039] Figure 8 for Figure 3 A schematic diagram illustrating the light emission and reflection principle of the light-emitting element shown;

[0040] Figure 9 This is a schematic diagram of the structure of a light-emitting element provided in an embodiment of the present invention;

[0041] Figure 10 This is a schematic diagram of another light-emitting element provided in an embodiment of the present invention;

[0042] Figure 11 This is a schematic diagram of another light-emitting element provided in an embodiment of the present invention;

[0043] Figure 12 for Figure 11 A schematic diagram illustrating the light emission and reflection principle of the light-emitting element shown;

[0044] Figures 13A-13I This is a structural diagram showing the structure of the display panel manufacturing method provided in this embodiment of the invention after each step. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. Furthermore, the embodiments and features in the embodiments of this disclosure can be combined with each other without conflict. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0046] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms "comprising" or "including," and similar terms as used in this disclosure, mean that an element or object preceding the term encompasses the elements or objects listed following the term and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. Terms such as "inner," "outer," "upper," and "lower" are used only to indicate relative positional relationships; these relative positional relationships may change accordingly when the absolute position of the described objects changes.

[0047] It should be noted that the dimensions and shapes of the figures in the accompanying drawings do not reflect actual proportions and are intended only to illustrate the content of this disclosure. Furthermore, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout.

[0048] This invention provides a display panel, such as... Figure 1 and Figure 2 As shown, Figure 1 This is a planar schematic diagram of some of the film layers in the display panel. Figure 2 for Figure 1 A cross-sectional view along the CC' direction, the display panel includes:

[0049] Drive backplane 1;

[0050] The barrier structure 2 is located on the drive back plate 1 and has multiple sub-pixel openings (21, 22 and 23).

[0051] Multiple light-emitting elements 3 are located within the openings (21, 22 and 23) of each sub-pixel;

[0052] Multiple quantum dot color conversion films 4, wherein at least some sub-pixel openings (e.g., 21 and 22) are provided with quantum dot color conversion films 4, and the orthographic projection of the quantum dot color conversion films 4 on the driving back plate 1 does not overlap with the orthographic projection of the light-emitting element 3 on the driving back plate 1.

[0053] The display panel provided in this embodiment of the invention, by placing both the light-emitting element and the quantum dot color conversion film within the sub-pixel opening, and ensuring that the orthographic projection of the quantum dot color conversion film on the driving backplate does not overlap with the orthographic projection of the light-emitting element on the driving backplate, allows the light-emitting element and the quantum dot color conversion film to be arranged horizontally within the same sub-pixel opening. This avoids light emitted by the light-emitting element from entering the openings of adjacent sub-pixels, thus solving the problem of light crosstalk that occurs when the quantum dot color conversion film and the light-emitting element are stacked vertically in related technologies, thereby improving the color purity and color gamut of the display panel.

[0054] In practical implementation, to further avoid light crosstalk between the openings of each sub-pixel, in the display panel provided in the embodiments of the present invention, as follows: Figure 2 As shown, the distance D between the surface of the barrier structure 2 facing away from the driving backplate 1 and the surface of the light-emitting element 3 facing away from the driving backplate 1 is greater than or equal to 2μm. In this way, the barrier structure 2 can confine the light emitted by the light-emitting element 3 within its respective sub-pixel opening, further avoiding light crosstalk.

[0055] In specific implementation, in the display panel provided in the embodiments of the present invention, such as Figure 2As shown, the material of the barrier structure 2 can be an absorptive material or a reflective material. In this way, when the light emitted by the light-emitting element 3 is incident on the barrier structure 2, it can be absorbed or reflected back, which can prevent the light from penetrating the barrier structure 2 and entering the opening of the adjacent sub-pixel, thereby further avoiding the problem of light crosstalk.

[0056] Optionally, such as Figure 2 As shown, the material of the barrier structure 2 can be a reflective material. For example, the main body material of the barrier structure 2 is resin, and TiO2 filler can be doped into the resin to play a reflective role. The light incident on the barrier structure 2 can be reflected back, which can enhance the light output while avoiding light crosstalk.

[0057] Optionally, such as Figure 2 As shown, the barrier structure 2 can be made of a light-absorbing resin material, which can avoid the problem of light incident on the top surface of the barrier structure 2 away from the driving backplate 1 being reflected, and can ensure that the light does not enter the opening of other sub-pixels, further avoiding the problem of light crosstalk.

[0058] In practical implementation, in order to improve the light emission intensity of each sub-pixel opening, in the display panel provided in the embodiments of the present invention, as follows: Figure 3 and Figure 4 As shown, it also includes a first metal reflective layer 5, which at least covers the sidewall of the barrier structure 2. In this way, the first metal reflective layer 5 can reflect the light incident on the sidewall of the barrier structure 2 to the quantum dot color conversion film, which on the one hand plays the role of preventing crosstalk, and on the other hand plays a stronger role in enhancing light output than using a reflective barrier structure 2.

[0059] Optionally, the first metal reflective layer 5 may be a reflective metal coating such as Ag, Al, or Mo, and the thickness of the first metal reflective layer 5 may be greater than or equal to 50 nm to ensure the reflectivity of the first metal reflective layer 5.

[0060] Optionally, in the display panel provided in the embodiments of the present invention, as follows: Figure 3 and Figure 4 As shown, the first metal reflective layer 5 can also cover the top surface of the barrier structure 2 on the side away from the drive back plate 1, which can further enhance the light emission effect.

[0061] In practical implementation, to avoid the light emitted by the light-emitting element from hitting the bottom of the quantum dot color conversion film and causing crosstalk from below the sub-pixel opening, in the display panel provided in the embodiments of the present invention, as follows: Figure 3 and Figure 4As shown, it also includes a second metal reflective layer 6 located between the driving backplate 1 and the quantum dot color conversion film 4. The orthographic projection of the second metal reflective layer 6 on the driving backplate 1 does not overlap with the orthographic projection of the light-emitting element 3 on the driving backplate 1. This can reflect the light incident on the bottom of the quantum dot color conversion film 4 back to the quantum dot color conversion film, which on the one hand avoids the problem of crosstalk from below the sub-pixel opening, and on the other hand can further enhance the light emission effect.

[0062] In specific implementation, in the display panel provided in the embodiments of the present invention, such as Figure 3 and Figure 4 As shown, the second metal reflective layer 6 and the first metal reflective layer 5 can be an integral structure. In this way, after the barrier structure 2 is fabricated, a whole layer of reflective material can be deposited, and the reflective material at the location where the light-emitting element 3 is to be fabricated can be etched away by an etching process, thereby forming an integral structure of the second metal reflective layer 6 and the first metal reflective layer 5.

[0063] Optionally, the second metal reflective layer 6 can be a reflective metal coating such as Ag, Al, or Mo, and the thickness of the second metal reflective layer 6 is greater than or equal to 50 nm to ensure the reflectivity of the second metal reflective layer 6.

[0064] In specific implementation, in the display panel provided in the embodiments of the present invention, such as Figure 3 and Figure 4 As shown, it also includes: a first planarization layer 7 located between the first metal reflective layer 5 and the quantum dot color conversion film 4 and covering the light-emitting element 3; and a third metal reflective layer 8 located on the side of the first metal reflective layer 5 and the first planarization layer 7 facing away from the driving backplate 1. The surface of the third metal reflective layer 8 facing away from the driving backplate 1 is flush with the surface of the quantum dot color conversion film 4 facing away from the driving backplate 1. Specifically, the first planarization layer 7 can provide a flat surface for the subsequent film layers. Since the light emission direction of the light-emitting element 3 is not fixed, it can emit light vertically or diverge at different angles. In order to prevent vertical light from failing to enter the quantum dot color conversion film 4, this embodiment of the invention provides a third metal reflective layer 8 on the side of the first metal reflective layer 5 and the first planarization layer 7 facing away from the driving backplate 1. In this way, vertical light entering the third metal reflective layer 8 can be reflected, ultimately allowing the light to enter the quantum dot color conversion film 4, further improving the light emission effect. Therefore, the first metal reflective layer 5, the second metal reflective layer 6 and the third metal reflective layer 8 can reflect the light emitted from the light-emitting element 3 in all directions to the quantum dot color conversion film 4 as much as possible, thereby maximizing the light output while avoiding light crosstalk.

[0065] Optionally, the third metal reflective layer 8 can be a reflective metal coating such as Ag, Al, or Mo, and the thickness of the third metal reflective layer 8 is greater than or equal to 50 nm to ensure the reflectivity of the third metal reflective layer 8.

[0066] Optionally, in the display panel provided in the embodiments of the present invention, as follows: Figure 3 As shown, the surface of the first flat layer 7 facing away from the drive backplate 1 and the surface of the first metal reflective layer 5 facing away from the drive backplate 1 can be flush. Of course, this flush setting refers to being roughly flush; due to factors such as manufacturing process, the two may not be completely flush.

[0067] Optionally, in the display panel provided in the embodiments of the present invention, as follows: Figure 4 As shown, the surface of the first planarization layer 7 facing away from the driving backplate 1 can be inclined. Within the same sub-pixel opening (e.g., 21), the distance from the inclined surface of the first planarization layer 7 to the driving backplate 1 gradually increases along the direction from the first metal reflective layer 5 to the quantum dot color conversion film 4. Thus, the surface of the third metal reflective layer 8 in contact with the first planarization layer 7 is inclined, so that the light incident on the light-emitting element 3 onto this inclined surface can be reflected to the quantum dot color conversion film 4 to the maximum extent, thereby further increasing the utilization rate of the vertical light emitted by the light-emitting element 3.

[0068] In specific implementation, in the display panel provided in the embodiments of the present invention, such as Figure 3 and Figure 4 As shown, the first planarization layer 7 may contain multiple scattering particles (not shown). Optionally, the material of the first planarization layer 7 is generally resin. By doping the resin with scattering particles, in addition to achieving the function of flattening the step, the light emission effect of the light-emitting element 3 can be further enhanced and the light emission viewing angle can be increased. Specifically, the material of the scattering particles can be TiO2.

[0069] In specific implementation, in the display panel provided in the embodiments of the present invention, such as Figure 5 and Figure 6 As shown, the barrier structure 2 and the first metallic reflective layer 5 can be an integral structure. For example, a whole layer of reflective material can be deposited on the drive backplate 1, and then etched using a halftone mask process to form... Figure 5 and Figure 6 The retaining wall structure 2, the first metal reflective layer 5, and the second metal reflective layer 6 shown are an integrated structure.

[0070] It should be noted that, Figure 5 In order to be in Figure 3 Based on Figure 3 The retaining wall structure 2 and the first metal reflective layer 5 are set as an integrated structure. Figure 6 In order to be in Figure 4 Based on Figure 4 The retaining wall structure 2 and the first metal reflective layer 5 are set as an integrated structure.

[0071] In specific implementation, in the display panel provided in the embodiments of the present invention, such as Figure 7 As shown, the retaining wall structure 2, the first metal reflective layer 5, and the third metal reflective layer 8 can be an integral structure. For example, a whole layer of reflective material can be deposited on the drive backplate 1, and then etched using a halftone mask process to form... Figure 7 The barrier structure 2, the first metal reflective layer 5, the second metal reflective layer 6 and the third metal reflective layer 8 shown are an integral structure.

[0072] It should be noted that, Figure 7 In order to be in Figure 3 Based on Figure 3 The retaining wall structure 2, the first metal reflective layer 5, and the third metal reflective layer 8 are set as an integrated structure.

[0073] In specific implementation, in the display panel provided in the embodiments of the present invention, such as Figures 2-7 As shown, the light-emitting element 3 can emit blue light, meaning that the light-emitting element 3 is a blue light source. Blue light is used as the excitation light, resulting in a better excitation effect. The sub-pixel openings include a first sub-pixel opening 21, a second sub-pixel opening 22, and a third sub-pixel opening 23. A red quantum dot color conversion film 4 (R-QD) is disposed in the first sub-pixel opening 21, a green quantum dot color conversion film 4 (G-QD) is disposed in the second sub-pixel opening 22, and the third sub-pixel opening 23 is filled with resin material 9. The resin material 9 contains scattering particles (not shown). The orthographic projection of the resin material 9 on the driving backplate 1 does not overlap with the orthographic projection of the light-emitting element 3 on the driving backplate 1. Specifically, the third sub-pixel opening 23 can directly emit blue light, serving as a blue sub-pixel; the red quantum dots in the red quantum dot color conversion film 4 (R-QD) within the first sub-pixel opening 21 can convert blue light into red light after being excited by blue light, becoming a red sub-pixel; the green quantum dots in the green quantum dot color conversion film 4 (G-QD) within the second sub-pixel opening 22 can convert blue light into green light after being excited by blue light, becoming a green sub-pixel; wherein, the red quantum dot color conversion film 4 (R-QD), the green quantum dot color conversion film 4 (G-QD), and the resin material 9 can be arranged sequentially to form three primary color sub-pixels, the three primary color sub-pixels constitute pixel units, and are arranged in a matrix distribution in a cyclical repeat to achieve color display function.

[0074] Specifically, within the third sub-pixel opening 23, scattering particles are doped into the resin material 9, and then the recess of the third sub-pixel opening 23 is filled using the resin material 9 doped with scattering particles. The scattering particles can enhance the light emission effect and increase the light emission angle. Specifically, the material for the scattering particles can be TiO2.

[0075] like Figure 8 As shown, Figure 8 For Figure 3 The schematic diagram illustrates the principle of light emitted from the light-emitting element 3 within the opening 21 of the first sub-pixel being reflected by the first metal reflective layer 5, the second metal reflective layer 6, and the third metal reflective layer 8 before exiting the quantum dot color conversion film 4. It can be seen that of the light emitted from the light-emitting element 3, a portion directly enters the quantum dot color conversion film 4 and exits; a portion first enters the first metal reflective layer 5, is reflected by it to the third metal reflective layer 8, then to the second metal reflective layer 6, and finally to the quantum dot color conversion film 4; and another portion first enters the third metal reflective layer 8, then to the second metal reflective layer 6, and finally to the quantum dot color conversion film 4. Therefore, light emitted from all directions by the light-emitting element 3 can ultimately be reflected to the quantum dot color conversion film 4, which avoids crosstalk between adjacent sub-pixels and enhances the light emission effect.

[0076] In specific implementation, in the display panel provided in the embodiments of the present invention, such as Figures 2-7 , Figure 9 and Figure 10 As shown, the light-emitting element 3 includes: a P-type semiconductor layer 31, an N-type semiconductor layer 32, a light-emitting layer 33 located between the P-type semiconductor layer 31 and the N-type semiconductor layer 32, a first electrode 34, and a second electrode 35; the first electrode 34 and the second electrode 35 are electrically connected to the driving backplate 1; as shown Figure 9 As shown, the light-emitting surface of the N-type semiconductor layer 32 can be parallel to the plane of the substrate 11 (described later) of the driving backplate 1, that is... Figures 2-7 The light-emitting element 3 in the middle is Figure 9 The structure shown; Figure 9 The light-emitting element shown primarily emits light upwards, with the upper surface being the main light-emitting surface. In this case, small-angle light rays are difficult to penetrate the quantum dot color conversion film 4 and be utilized; only large-angle light rays from the sides can enter the quantum dot color conversion film 4. Figure 8 As shown. Therefore, the embodiments of the present invention preferably adopt... Figure 10 The structure of the light-emitting element 3 shown is relative to Figure 9 The mounting orientation shown is rotated 90° so that the conventionally upward-facing light-emitting surface faces the quantum dot color conversion film 4, that is, the light-emitting surface of the N-type semiconductor layer 32 can face the quantum dot color conversion film 4, as shown. Figure 11 As shown; Figure 10 and Figure 11The light-emitting element 3 shown is a side-emitting element (i.e., it emits light from one side of the quantum dot color conversion film 4), which allows for efficient utilization of the light emitted by the light-emitting element 3, enabling more light to directly enter the quantum dot color conversion film 4, such as... Figure 12 As shown, this avoids light loss caused by multiple reflections.

[0077] It should be noted that the embodiments of the present invention Figure 11 Therefore, Figure 3 The light-emitting element 3 shown is replaced with Figure 10 Taking the structure of the light-emitting element 3 shown as an example, of course... Figure 2 , Figures 4-7 The light-emitting element 3 shown can also be used Figure 10 The structure of the light-emitting element 3 is shown.

[0078] Specifically, the light-emitting element 3 is made of inorganic material, which has better stability compared to organic materials.

[0079] In specific implementation, in the display panel provided in the embodiments of the present invention, such as Figures 2-7 As shown, the driving backplate 1 includes: a substrate 11, a driving circuit 12 located on the side of the substrate 11 facing the light-emitting element 3, a second planarization layer 13 located on the side of the driving circuit 12 facing the light-emitting element 3, a third electrode 14 and a fourth electrode 15 located on the side of the second planarization layer 13 facing the light-emitting element 3, and a passivation layer 16 located on the side of the third electrode 14 and the fourth electrode 15 facing the light-emitting element 3; the third electrode 14 is electrically connected to the driving circuit 12 through a via penetrating the second planarization layer 13, and the fourth electrode 15 is grounded;

[0080] The first electrode 34 is electrically connected to the third electrode 14 through a via penetrating the passivation layer 16, and the second electrode 35 is electrically connected to the fourth electrode 15 through a via penetrating the passivation layer 16.

[0081] In specific implementation, in the display panel provided in the embodiments of the present invention, such as Figures 2-7 As shown, the driving circuit 12 includes an active layer 121, a first gate layer 122, a second gate layer 123, a source 124, and a drain 125. The third electrode 14 is electrically connected to the drain 125 through a via penetrating the second planarization layer 13. Specifically, the third electrode 14 and the fourth electrode 15 are transfer electrodes (pins) when the light-emitting element 3 is externally transferred. The materials of the third electrode 14 and the fourth electrode 15 can be Ag, Au, etc.

[0082] In specific implementation, such as Figures 2-7As shown, the driving backplate 1 further includes: a buffer layer 17 located between the substrate 11 and the driving circuit 12; a first gate insulating layer 18 located between the active layer 121 and the first gate layer 122; a second gate insulating layer 19 located between the first gate layer 122 and the second gate layer 123; and an interlayer insulating layer 20 located between the second gate layer 123 and the source 124 and the drain 125.

[0083] In specific implementation, when the light-emitting element 3 emits light, the driving circuit 12 inputs a driving current to the light-emitting element 3. The specific light-emitting principle is the same as the existing technology, and will not be described in detail here.

[0084] In specific implementation, in the display panel provided in the embodiments of the present invention, such as Figures 2-7 As shown, it also includes an encapsulation layer 10 located on the side of the quantum dot color conversion film 4 away from the driving backplate 1. The encapsulation layer 10 may include an alternating inorganic layer-organic layer-inorganic layer. The encapsulation layer 10 is used to block external moisture and protect the quantum dot material in the quantum dot color conversion film 4 from contact with water, oxygen, etc., so as to improve the stability and lifespan of the device.

[0085] In specific implementation, in the display panel provided in the embodiments of the present invention, such as Figures 2-7 As shown, it also includes a color filter layer 30 located on the side of the encapsulation layer 10 facing away from the driving backplate 1. The color filter layer 30 includes multiple color filters (R-CF, G-CF, B-CF) that correspond one-to-one with the quantum dot color conversion film 4. For example, the red quantum dot color conversion film (R-QD) corresponds to the red color group (R-CF), the green quantum dot color conversion film (G-QD) corresponds to the green color group (G-CF), and the third sub-pixel opening 23 (filled with resin material) corresponds to the blue color group (B-CF). The color filters can act as light filters, allowing each sub-pixel opening to emit light with higher color purity, thus improving the display effect.

[0086] Optionally, the light-emitting element can be a Micro LED. Because Micro LEDs are small in size, they can improve the pixel resolution of the display panel. Specifically, the size of a Micro LED is generally less than 100μm. Of course, the light-emitting element can also be other light-emitting elements such as Mini LEDs, and this invention does not limit this. Specifically, when the light-emitting element is a Mini LED, the size of the Mini LED is 100μm-200μm.

[0087] In specific implementations, the display panel provided in the embodiments of the present invention may also include other functional film layers known to those skilled in the art, which will not be described in detail here.

[0088] The following is based on Figure 3 Taking the display panel shown as an example, the manufacturing method of the display panel provided in this embodiment of the invention will be described in detail:

[0089] (1) A drive backplane 1 is provided. The manufacturing method of the drive backplane 1 is the same as that of the prior art, and will not be described in detail here. Figure 13A As shown.

[0090] (2) A retaining wall structure 2 is formed on the drive back plate 1, such as Figure 13B As shown; the retaining wall structure 2 can be made of absorbent or reflective materials, or other adhesives that can achieve the thickness of the membrane layer.

[0091] (3) A single layer of metallic reflective material film is deposited on the retaining wall structure 2, and the metallic reflective material film is patterned to expose the third electrode 14 and the fourth electrode 15, forming an integral first metallic reflective layer 5 and a second metallic reflective layer 6, as shown in the figure. Figure 13C As shown.

[0092] (4) The light-emitting element 3 is bonded to the driving backplate 1 by bonding, that is, the first electrode 34 of the light-emitting element 3 is electrically connected to the third electrode 14 on the driving backplate 1, and the second electrode 35 of the light-emitting element 3 is electrically connected to the fourth electrode 15 on the driving backplate 1. Figure 13D As shown;

[0093] (5) A first planar layer 7 is formed on the side of the light-emitting element 3 facing away from the driving backplate 1, covering multiple sub-pixel openings (21, 22 and 23), as shown in the figure. Figure 13E As shown; the material of the first planarization layer 7 can be a white oil planarization layer, the main component of which is a resin material containing scattering particles.

[0094] (6) A complete layer of metal reflective material film is deposited on the first planarization layer 7 and the first metal reflective layer 5, and the metal reflective material film is patterned to form a third metal reflective layer 8, such as... Figure 13F As shown;

[0095] (7) Etch the first planarization layer 7 to expose the area where the quantum dot color conversion film will be fabricated, such as... Figure 13G As shown.

[0096] (8) A quantum dot color conversion film 4 is formed in each sub-pixel opening (21, 22, and 23) by spin coating or inkjet printing. The surface of the quantum dot color conversion film 4 facing away from the driving backplate 1 is flush with the surface of the third metal reflective layer 8 facing away from the driving backplate 1. Figure 13H As shown.

[0097] (9) An encapsulation layer 10 is prepared on the side of the quantum dot color conversion film 4 and the third metal reflective layer 8 that faces away from the driving backplate 1, such as... Figure 13I As shown.

[0098] (10) A color filter layer 30 is prepared on the encapsulation layer 10, such as... Figure 3 As shown.

[0099] In summary, the product provided in the embodiments of the present invention can be prepared through the above steps (1)-(10). Figure 3 The display panel shown can prevent crosstalk between adjacent sub-pixels and enhance light emission.

[0100] Based on the same inventive concept, embodiments of the present invention also provide a display device, including any of the display panels described above. This display device can be any product or component with display functionality, such as a mobile phone, tablet computer, television, monitor, laptop computer, digital photo frame, or navigator. Other essential components of this display device are readily understood by those skilled in the art and will not be elaborated upon here, nor should they be construed as limiting the present invention. Implementation of this display device can refer to the embodiments of the aforementioned display panels; repeated details will not be elaborated upon.

[0101] The present invention provides a display panel and display device, which, by placing both the light-emitting element and the quantum dot color conversion film within the sub-pixel opening, and ensuring that the orthographic projection of the quantum dot color conversion film on the driving backplate does not overlap with the orthographic projection of the light-emitting element on the driving backplate, allows the light-emitting element and the quantum dot color conversion film to be arranged horizontally within the same sub-pixel opening. This avoids light emitted by the light-emitting element from entering the openings of adjacent sub-pixels, thus solving the problem of light crosstalk that occurs when the quantum dot color conversion film and the light-emitting element are stacked vertically in related technologies, thereby improving the color purity and display color gamut of the display panel.

[0102] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A display panel, characterized in that, include: Drive backplane; A retaining wall structure is located on the drive backplate, and the retaining wall structure has multiple sub-pixel openings; Multiple light-emitting elements are respectively located within the opening of each sub-pixel; Multiple quantum dot color conversion films, wherein at least some of the sub-pixel openings are provided with the quantum dot color conversion film, and the orthographic projection of the quantum dot color conversion film on the driving back plate does not overlap with the orthographic projection of the light-emitting element on the driving back plate; Within the same sub-pixel opening, the light-emitting element and the quantum dot color conversion film are arranged horizontally to prevent light emitted by the light-emitting element from entering the opening of adjacent sub-pixels.

2. The display panel as described in claim 1, characterized in that, It also includes a first metal reflective layer, which at least covers the sidewalls of the retaining wall structure.

3. The display panel as described in claim 2, characterized in that, The first metal reflective layer also covers the top surface of the retaining wall structure on the side opposite to the drive back plate.

4. The display panel as described in claim 3, characterized in that, It also includes a second metal reflective layer located between the driving backplate and the quantum dot color conversion film, wherein the orthographic projection of the second metal reflective layer on the driving backplate does not overlap with the orthographic projection of the light-emitting element on the driving backplate.

5. The display panel as described in claim 4, characterized in that, The second metal reflective layer and the first metal reflective layer are an integral structure.

6. The display panel as described in claim 5, characterized in that, Also includes: A first planarization layer is located between the first metal reflective layer and the quantum dot color conversion film and covers the light-emitting element, and a third metal reflective layer is located on the side of the first metal reflective layer and the first planarization layer facing away from the driving backplate. The surface of the third metal reflective layer facing away from the driving backplate is flush with the surface of the quantum dot color conversion film facing away from the driving backplate.

7. The display panel as described in claim 6, characterized in that, The surface of the first flat layer facing away from the drive backplate is flush with the surface of the first metal reflective layer facing away from the drive backplate.

8. The display panel as described in claim 6, characterized in that, The surface of the first flat layer facing away from the driving backplate is inclined; within the same sub-pixel opening, along the direction from the first metal reflective layer to the quantum dot color conversion film, the distance from the inclined surface to the driving backplate gradually increases.

9. The display panel as described in claim 6, characterized in that, The thicknesses of the first metal reflective layer, the second metal reflective layer, and the third metal reflective layer are all greater than or equal to 50 nm.

10. The display panel as claimed in claim 6, characterized in that, The first flat layer contains multiple scattering particles.

11. The display panel as described in any one of claims 1-10, characterized in that, The distance between the surface of the retaining wall structure facing away from the driving back plate and the surface of the light-emitting element facing away from the driving back plate is greater than or equal to 2μm.

12. The display panel as described in any one of claims 1-10, characterized in that, The retaining wall structure is made of absorbent or reflective materials.

13. The display panel as described in any one of claims 2-10, characterized in that, The retaining wall structure and the first metal reflective layer are an integral structure.

14. The display panel as described in any one of claims 6-10, characterized in that, The retaining wall structure, the first metal reflective layer, and the third metal reflective layer are an integral structure.

15. The display panel as described in any one of claims 1-10, characterized in that, The light-emitting element emits blue light. The sub-pixel opening includes a first sub-pixel opening, a second sub-pixel opening, and a third sub-pixel opening. A red quantum dot color conversion film is disposed in the first sub-pixel opening, a green quantum dot color conversion film is disposed in the second sub-pixel opening, and the third sub-pixel opening is filled with resin material containing scattering particles. The orthographic projection of the resin material on the driving backplate does not overlap with the orthographic projection of the light-emitting element on the driving backplate.

16. The display panel as claimed in claim 1, characterized in that, The light-emitting element includes: a P-type semiconductor layer, an N-type semiconductor layer, a light-emitting layer located between the P-type semiconductor layer and the N-type semiconductor layer, a first electrode, and a second electrode; the first electrode and the second electrode are electrically connected to the driving backplate, and the light-emitting surface of the N-type semiconductor layer is parallel to the plane of the substrate of the driving backplate.

17. The display panel as claimed in claim 1, characterized in that, The light-emitting element includes: a P-type semiconductor layer, an N-type semiconductor layer, a light-emitting layer located between the P-type semiconductor layer and the N-type semiconductor layer, a first electrode, and a second electrode; the first electrode and the second electrode are electrically connected to the driving backplate, and the light-emitting surface of the N-type semiconductor layer faces the quantum dot color conversion film.

18. The display panel as claimed in claim 16 or 17, characterized in that, The driving backplane includes: a substrate, a driving circuit located on the side of the substrate facing the light-emitting element, a second planarization layer located on the side of the driving circuit facing the light-emitting element, a third electrode and a fourth electrode located on the side of the second planarization layer facing the light-emitting element, and a passivation layer located on the side of the third electrode and the fourth electrode facing the light-emitting element; the third electrode is electrically connected to the driving circuit through a via penetrating the second planarization layer, and the fourth electrode is grounded. The first electrode is electrically connected to the third electrode through a via penetrating the passivation layer, and the second electrode is electrically connected to the fourth electrode through a via penetrating the passivation layer.

19. The display panel as claimed in claim 18, characterized in that, Also includes: An encapsulation layer located on the side of the quantum dot color conversion film facing away from the driving backplate, and a color filter layer located on the side of the encapsulation layer facing away from the driving backplate; The color filter layer includes multiple color filters that correspond one-to-one with the quantum dot color conversion film.

20. A display device, characterized in that, Includes the display panel as described in any one of claims 1-19.

Images