CN111430570B - Display panel and method for manufacturing display panel - Google Patents
Display panel and method for manufacturing display panel Download PDFInfo
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- CN111430570B CN111430570B CN202010253709.8A CN202010253709A CN111430570B CN 111430570 B CN111430570 B CN 111430570B CN 202010253709 A CN202010253709 A CN 202010253709A CN 111430570 B CN111430570 B CN 111430570B
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/85—Arrangements for extracting light from the devices
- H10K50/854—Arrangements for extracting light from the devices comprising scattering means
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/11—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers
- H10K50/125—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers specially adapted for multicolour light emission, e.g. for emitting white light
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- H—ELECTRICITY
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/30—Devices specially adapted for multicolour light emission
- H10K59/35—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels
- H10K59/351—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels comprising more than three subpixels, e.g. red-green-blue-white [RGBW]
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/30—Devices specially adapted for multicolour light emission
- H10K59/38—Devices specially adapted for multicolour light emission comprising colour filters or colour changing media [CCM]
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- H—ELECTRICITY
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Abstract
The application provides a display panel and a manufacturing method thereof. The display panel includes: the light-emitting diode comprises a first substrate, a second substrate arranged opposite to the first substrate, and a blue light emitting layer and a color conversion layer which are arranged between the first substrate and the second substrate in a stacked mode, wherein the color conversion layer is arranged on the light emitting side of the blue light emitting layer, the color conversion layer comprises a plurality of diffusion pixel units, each diffusion pixel unit comprises a matrix, and first scattering particles and second scattering particles which are dispersed in the matrix, the first scattering particles are located on the side, close to the blue light emitting layer, of the color conversion layer, the second scattering particles are located on the side, far away from the blue light emitting layer, of the color conversion layer, the molar concentration of the first scattering particles is smaller than that of the second scattering particles, and the particle size of the first scattering particles is larger than that of the second scattering particles.
Description
Technical Field
The present disclosure relates to display technologies, and particularly to a display panel and a method for manufacturing the display panel.
Background
An Organic Light-Emitting Diode (OLED) display panel is known, which uses a whole-surface evaporated blue OLED as a self-Light source and is matched with a color conversion film prepared by a wet method, so as to realize full-color display. However, due to the interference between adjacent color conversion materials, poor light absorption and light extraction efficiency, the light efficiency of the conversion film is low, and the energy utilization and display brightness of the display device are directly affected.
Disclosure of Invention
In view of the above, the present disclosure is directed to a display panel capable of improving light conversion efficiency and a method for manufacturing the same.
The application provides a display panel, it includes: the light-emitting diode comprises a first substrate, a second substrate arranged opposite to the first substrate, and a blue light emitting layer and a color conversion layer which are arranged between the first substrate and the second substrate in a stacked mode, wherein the color conversion layer is arranged on the light emitting side of the blue light emitting layer, the color conversion layer comprises a plurality of diffusion pixel units, each diffusion pixel unit comprises a matrix, and first scattering particles and second scattering particles which are dispersed in the matrix, the first scattering particles are located on the side, close to the blue light emitting layer, of the color conversion layer, the second scattering particles are located on the side, far away from the blue light emitting layer, of the color conversion layer, the molar concentration of the first scattering particles is smaller than that of the second scattering particles, and the particle size of the first scattering particles is larger than that of the second scattering particles.
In one embodiment, the first scattering particles and the second scattering particles are continuously distributed in a direction from a side of the diffusion pixel unit close to the blue light emitting layer toward a side far from the blue light emitting layer.
In one embodiment, the matrix includes a first film layer and a second film layer disposed in a stack, the first scattering particles being dispersed in the first film layer and the second scattering particles being dispersed in the second film layer.
In one embodiment, the first scattering particles dispersed in each of the first film layers have the same particle size and molar concentration, and the second scattering particles dispersed in each of the second film layers have the same particle size and molar concentration.
In one embodiment, the first scattering particles and the second scattering particles have a gradually decreasing particle diameter in a direction from a side of the diffusion pixel unit closer to the blue light emitting layer toward a side farther from the blue light emitting layer.
In one embodiment, the molar concentrations of the first scattering particles and the second scattering particles are gradually increased in a direction from a side of the diffusion pixel unit close to the blue light emitting layer to a side far from the blue light emitting layer.
In one embodiment, the color conversion layer includes a red pixel unit, a green pixel unit and a blue pixel unit arranged in an array, the red pixel unit and the green pixel unit include a color conversion material in a matrix, the blue pixel unit does not include a color conversion material in a matrix, and the blue pixel unit is the diffusion pixel unit.
In one embodiment, the diffusion pixel unit further includes the red pixel unit and the green pixel unit, the first scattering particles in the red pixel unit and the green pixel unit have a smaller particle size and a higher molar concentration than the first scattering particles in the blue pixel unit on a side close to the blue light emitting layer, and the second scattering particles in the red pixel unit and the green pixel unit have a larger particle size and a lower molar concentration than the second scattering particles in the blue pixel unit on a side away from the blue light emitting layer.
The application provides a manufacturing method of a display panel, which comprises the following steps:
providing a first substrate and a second substrate arranged opposite to the first substrate; and
forming a blue light emitting layer on the first substrate, forming a color conversion layer on the first substrate or the second substrate, and bonding the first substrate and the second substrate to enable the color conversion layer to be positioned on the light emitting side of the blue light emitting layer;
wherein the color conversion layer includes a plurality of diffusion pixel units, and the step of forming the diffusion pixel units includes:
mixing the first scattering particles in a matrix solution, patterning and curing into a first film layer through a wet process;
mixing second scattering particles in a matrix solution, patterning and curing the second scattering particles on the first film layer into a second film layer through a wet process;
the first scattering particles and the second scattering particles are respectively one of first scattering particles and second scattering particles,
the film layer formed by the first scattering particles is positioned on one side of the color conversion layer close to the blue light emitting layer, the film layer formed by the second scattering particles is positioned on one side of the color conversion layer far away from the blue light emitting layer,
the molar concentration of the first scattering particles is less than that of the second scattering particles, and the particle size of the first scattering particles is greater than that of the second scattering particles.
In one embodiment, the step of forming the diffusion pixel cell further comprises: the method further includes the step of patterning and curing the matrix solution on the first film layer into a matrix film layer by a wet process prior to the step of mixing the second scattering particles in the matrix solution, patterning and curing the second scattering particles on the first film layer into a second film layer by a wet process.
The organic light emitting diode display panel has the advantages that the first scattering particles and the second scattering particles are added in the blue pixel unit, the first scattering particle films with large sizes and low molar concentrations are dispersed on the light inlet side, namely the side close to the blue light emitting layer, the blue light is converged and enhanced to be emitted to the light outlet side, and excitation of a color conversion material is promoted. At the light-emitting side, namely, keep away from blue light luminescent layer one side, the second scattering particle film that has small-size, high molar concentration disperses, and the reinforcing light scattering promotes light extraction efficiency, can solve the blue pixel unit visual angle and little, the luminance low problem of. In addition, first and second scattering particles may be added to the green and red pixel cells to improve light efficiency.
Drawings
In order to more clearly illustrate the technical solutions in the present application, the drawings required for the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings may be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic cross-sectional view of a display panel according to a first embodiment of the present disclosure.
Fig. 2 is a schematic cross-sectional view of a display panel according to another embodiment of the present application.
Fig. 3 is a schematic cross-sectional view of a display panel according to yet another embodiment of the present application.
Fig. 4 is a flowchart of a method for manufacturing a display panel according to a second embodiment of the present application.
Fig. 5 is a flowchart of a method for forming a diffusion pixel unit in a method for manufacturing a display panel according to a second embodiment of the present application.
Fig. 6 is a flowchart of a method for forming a diffusion pixel unit in a method for manufacturing a display panel according to another embodiment of the present application.
Detailed Description
The technical solution in the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. It should be apparent that the described embodiments are only some embodiments of the present application, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any inventive step based on the embodiments in the present application, are within the scope of protection of the present application.
Referring to fig. 1, a display panel 100 according to a first embodiment of the present disclosure includes a first substrate 10, a second substrate 20 disposed opposite to the first substrate 10, and a blue light emitting layer 30 and a patterned color conversion layer 40 stacked between the first substrate 10 and the second substrate 20. The color conversion layer 40 is disposed on the light-emitting side of the blue light-emitting layer 30. In the present embodiment, the blue light emitting layer 30 is disposed on the first substrate 10. The color conversion layer 40 is disposed on the second substrate 20. In another embodiment, the blue light emitting layer 30 and the color conversion layer 40 may both be disposed on the first substrate 10. The display panel 100 may further include a color filter layer 50 disposed between the second substrate 20 and the color conversion layer 40.
The blue light emitting layer 30 includes a plurality of blue light emitting parts 31 arranged in an array and a light shielding layer 32 disposed between the adjacent blue light emitting parts 31. The blue Light Emitting part 31 may be a blue Organic Light-Emitting Diode device (OLED) or a blue Micro Light-Emitting Diode device (Micro LED). The light-shielding layer 32 may be a black matrix.
The color conversion layer 40 includes a plurality of diffusion pixel units 41. The diffusion pixel unit 41 may be selected from one or more of a red pixel unit, a green pixel unit, and a blue pixel unit. For example, in the present embodiment, the color conversion layer 40 includes a plurality of red pixel cells 41R, green pixel cells 41G, and blue pixel cells 41B arranged in an array, and spacers 42 disposed between adjacent diffusion pixel cells. Each of the red pixel cells 41R, each of the green pixel cells 41G, and each of the blue pixel cells 41B are provided in one-to-one correspondence with one of the blue light emitting sections 31. In this embodiment, the diffusion pixel unit 41 is referred to as a blue pixel unit 41B. It is understood that the color conversion layer 40 may further include a yellow pixel unit and a white pixel unit, and at this time, the diffusion pixel unit 41 may be selected from one or more of a red pixel unit, a green pixel unit, a blue pixel unit, a yellow pixel unit, and a white pixel unit.
The diffusion pixel unit 41 includes a matrix 411 and first and second scattering particles 412 and 413 dispersed in the matrix 411. The substrate 411 is a film containing a color conversion material or a transparent film containing no color conversion material. The color conversion material may be a phosphor, quantum dot, perovskite, or the like. In this embodiment, the host 411 used for the blue pixel unit 41B does not color-convert the light emitted from the blue light emitting layer 40, and the host 411 is a transparent thin film containing no color conversion material. The host 411 for the red pixel unit 41R and the green pixel unit 41G is used for color conversion of light emitted from the blue light emitting layer 40, that is, for emitting red or green light under excitation of blue light emitted from the blue light emitting layer 40. In this case, the substrate 411 is a thin film including phosphor, quantum dots, or perovskite. In other embodiments, the host 411 for the blue pixel unit 41B may emit blue light under excitation of blue light emitted from the blue light emitting layer 40, and in this case, the host 411 is a thin film including phosphor, quantum dot, or perovskite.
Depending on the manufacturing method, the matrix 411 may be a uniform, continuous film in which the first scattering particles 412 and the second scattering particles 413 are sequentially dispersed. As shown in fig. 2, the substrate 411 includes at least one first membrane layer 4111 and at least one second membrane layer 4112 arranged in a stack. The first scattering particles 412 are dispersed in the first layer 4111, and the second scattering particles 412 are dispersed in the second layer 4112. The particle size and molar concentration of the dispersed first scattering particles 412 in each first film layer 4111 are the same or approximately the same. The particle size and molar concentration of the second scattering particles 413 dispersed in each second film layer 4112 are the same or about the same. The first scattering particles 412 are located on the color conversion layer 40 side close to the blue light emitting layer 30. The second scattering particles 413 are located on the side of the color conversion layer 40 away from the blue light emitting layer 30. Wherein, the molar concentration of the first scattering particles 412 is less than the molar concentration of the second scattering particles 413. The first scattering particles 412 have a larger particle size than the second scattering particles 413. In one embodiment, the average particle size of the first scattering particles 412 may be made larger than the average particle size of the second scattering particles 413. In another embodiment, the minimum particle size of the first scattering particles 412 may be larger than the maximum particle size of the second scattering particles 413.
The particle diameter of the first scattering particles 412 gradually becomes smaller in a direction from the side of the diffusion pixel unit 41 closer to the blue light emitting layer 30 toward the side farther from the blue light emitting layer 30. The particle diameter of the second scattering particles 412 becomes gradually smaller in a direction from the side of the diffusion pixel unit 41 closer to the blue light-emitting layer 30 toward the side farther from the blue light-emitting layer 30. The molar concentration of the first scattering particles 412 is gradually increased in a direction from the side of the diffusion pixel unit 41 closer to the blue light emitting layer 30 toward the side farther from the blue light emitting layer 30. The molar concentration of the second scattering particles 413 gradually becomes larger in a direction from the side of the diffusion pixel unit 41 closer to the blue light emitting layer 30 toward the side farther from the blue light emitting layer 30. The first scattering particles 412 and the second scattering particles 413 are selected from one or more organic scattering particles such as organic silicon, polystyrene and polycarbonate or from one or more inorganic scattering particles such as titanium dioxide, zirconium dioxide, vanadium dioxide, tin dioxide, aluminum oxide and barium titanate. The particle diameters of the first scattering particles and the second scattering particles are 10nm-2500 nm.
In the present embodiment, the first scattering particles 412 and the second scattering particles 413 are continuously distributed in a direction from the side of the diffusion pixel unit 41 closer to the blue light emitting layer 30 toward the side farther from the blue light emitting layer 30. In another embodiment, the first scattering particles 412 and the second scattering particles 413 may be non-continuously distributed, that is, the first scattering particles 412 with large size and low molar concentration are dispersed only on the light incident side, that is, the side close to the blue light emitting layer 30, and the second scattering particles 413 with small size and high molar concentration are dispersed only on the light emitting side, that is, the side far from the blue light emitting layer 30.
In the embodiment, red and green light is generated by exciting the color conversion material, and blue light is directly emitted from the blue light backlight source, so that the viewing angle and brightness of the blue light are smaller than those of the red and green light, and color cast and lower brightness and dark picture are caused in side view. The film containing large-size and low-concentration scattering particles is formed on the side close to the blue light backlight source, namely the light incident side, and the forward emergence of the blue light is converged and enhanced; the scattering particle film with small size and high concentration is formed on the light-emitting side far away from the blue light backlight source, so that the light scattering is enhanced, and the light-emitting efficiency and the visual angle are improved.
In the present embodiment, only the first and second scattering particles 412 and 413 are added to the blue pixel cell 41B, and the first and second scattering particles 412 and 413 are not added to the red and green pixel cells 41R and 41G. In another embodiment of the present application, referring to fig. 3, in order to improve the light efficiency of the red pixel unit 41R and the green pixel unit 41G, the first scattering particles 412 and the second scattering particles 413 are also added to the red pixel unit 41R and the green pixel unit 41G. In order to balance the luminance difference between the pixel units, the particle diameters and molar concentrations of the first scattering particles 412 and the second scattering particles 413 added to the red pixel unit 41R and the green pixel unit 41G may be adjusted to be different from those of the first scattering particles 412 and the second scattering particles 413 added to the blue pixel unit 41B. For example, on the side close to the blue light emitting layer 30, the first scattering particles 412 in the red pixel unit 41R and the green pixel unit 41G have a smaller particle size than the first scattering particles 412 in the blue pixel unit 41B and a higher molar concentration than the first scattering particles 412 in the blue pixel unit 41B. On the side away from the blue light emitting layer 30, the second scattering particles 413 in the red pixel unit 41R and the green pixel unit 41G have a larger particle size than the second scattering particles 413 in the blue pixel unit 41B and a lower molar concentration than the second scattering particles 413 in the blue pixel unit 41B.
Referring to fig. 2 and fig. 4 together, a second embodiment of the present application further provides a method for manufacturing a display panel, which can be used to manufacture the display panel 100 of the present application.
The manufacturing method comprises the following steps:
providing a first substrate 10 and a second substrate 20 disposed opposite to the first substrate 10; and
the blue light emitting layer 30 is formed on the first substrate 10, the color conversion layer 40 is formed on the first substrate 10 or the second substrate 20, and the first substrate 10 and the second substrate 20 are bonded to each other such that the color conversion layer 40 is positioned on the light emitting side of the blue light emitting layer 30.
In this embodiment mode, the color conversion layer 40 is formed on the second substrate 20. In another embodiment, the blue light emitting layer 30 and the color conversion layer 40 may be both formed on the first substrate 10. In addition, the manufacturing method of the display panel may further include a step of forming the color filter layer 50 on the second substrate 20 before forming the color conversion layer 40.
The blue light emitting layer 30 includes a plurality of blue light emitting parts 31 arranged in an array and a light shielding layer 32 disposed between the adjacent blue light emitting parts 31. The blue light emitting section 31 may be a blue organic light emitting diode device or a blue micro light emitting diode device. The light-shielding layer 32 may be a black matrix.
The color conversion layer 40 includes a plurality of diffusion pixel units 41. The diffusion pixel unit 41 may be selected from one or more of a red pixel unit, a green pixel unit, and a blue pixel unit. For example, in the present embodiment, the color conversion layer 40 includes a plurality of red pixel cells 41R, green pixel cells 41G, and blue pixel cells 41B arranged in an array, and spacers 42 disposed between adjacent diffusion pixel cells. Each of the red pixel cells 41R, each of the green pixel cells 41G, and each of the blue pixel cells 41B are provided in one-to-one correspondence with one of the blue light emitting sections 31. In this embodiment, the diffusion pixel unit 41 is referred to as a blue pixel unit 41B. It is understood that the color conversion layer 40 may further include a yellow pixel unit and a white pixel unit, and at this time, the diffusion pixel unit 41 may be selected from one or more of a red pixel unit, a green pixel unit, a blue pixel unit, a yellow pixel unit, and a white pixel unit.
The diffusion pixel unit 41 includes a matrix 411 and first and second scattering particles 412 and 413 dispersed in the matrix 411. The substrate 411 is a film containing a color conversion material or a transparent film containing no color conversion material. The color conversion material may be a phosphor, quantum dot, perovskite, or the like.
In this embodiment, the host 411 used for the blue pixel unit 41B does not color-convert the light emitted from the blue light emitting layer 40, and the host 411 is a transparent thin film containing no color conversion material. The substrates 411 for the red pixel unit 41R and the green pixel unit 41G are used for color conversion of light emitted from the blue light emitting layer 40, that is, for emission of red or green light under excitation of blue light emitted from the blue light emitting layer 40. In this case, the substrate 411 is a thin film including phosphor, quantum dots, or perovskite. In other embodiments, the host 411 for the blue pixel unit 41B may emit blue light under excitation of blue light emitted from the blue light emitting layer 40, and in this case, the host 411 is a thin film including phosphor, quantum dot, or perovskite.
Wherein the color conversion layer 40 includes a plurality of diffusion pixel units 41. Referring to fig. 5, the step of forming the diffusion pixel unit 41 includes:
mixing the first scattering particles 412 in a matrix solution, patterning and curing into a first film layer 4111 by a wet process; this step may also be repeated multiple times, and the first scattering particles 412 with different particle sizes and/or molar concentrations are mixed in the matrix solution to form a plurality of first film layers 4111; the wet process may be an ink jet printing or a photo etching process.
Mixing the second scattering particles 413 in a matrix solution, patterning and curing the second film layer 4112 on the first film layer through a wet process; this step may be repeated a plurality of times, and the second scattering particles with different particle sizes and/or molar concentrations are mixed in the matrix solution to form a plurality of second film layers 4112.
The first scattering particle and the second scattering particle are one of the first scattering particle 412 and the second scattering particle 413, respectively.
The film layer formed by the first scattering particles 412 is located on the side of the color conversion layer 40 close to the blue light emitting layer 30, and the film layer formed by the second scattering particles 413 is located on the side of the color conversion layer 40 far from the blue light emitting layer 30. Wherein, the molar concentration of the first scattering particles 412 is less than the molar concentration of the second scattering particles 413. The first scattering particles 412 have a larger particle size than the second scattering particles 413. In one embodiment, the average particle size of the first scattering particles 412 may be larger than the average particle size of the second scattering particles 413. In another embodiment, the minimum particle size of the first scattering particles 412 may be larger than the maximum particle size of the second scattering particles 413. When the color conversion layer 40 is formed on the second substrate 20, a film layer of the second scattering particles 413 may be formed first, and then a film layer of the first scattering particles 412 may be formed. When the color conversion layer 40 is formed on the first substrate 10, a film layer of the first scattering particles 412 may be formed first, and then a film layer of the second scattering particles 413 may be formed.
In the color conversion layer 40 formed according to this method, the substrate 411 includes a first film layer 4111 and a second film layer 4112 which are stacked. The first scattering particles 412 are dispersed in the first film layer 4111, and the particle size and molar concentration of the first scattering particles 412 dispersed in each first film layer 4111 in the second film layer 4112 are the same or about the same. The second scattering particles 413 dispersed in each second film layer 4112 have the same or approximately the same particle size and molar concentration. Further, the particle diameter of the first scattering particles 412 gradually becomes smaller in a direction from the side of the diffusion pixel unit 41 closer to the blue light emitting layer 30 toward the side farther from the blue light emitting layer 30. The particle diameter of the second scattering particles 412 becomes gradually smaller in a direction from the side of the diffusion pixel unit 41 closer to the blue light-emitting layer 30 toward the side farther from the blue light-emitting layer 30. The molar concentration of the first scattering particles 412 is gradually increased in a direction from the side of the diffusion pixel unit 41 closer to the blue light emitting layer 30 toward the side farther from the blue light emitting layer 30. The molar concentration of the second scattering particles 413 gradually becomes larger in a direction from the side of the diffusion pixel unit 41 closer to the blue light emitting layer 30 toward the side farther from the blue light emitting layer 30. The first scattering particles 412 and the second scattering particles 413 are selected from one or more organic scattering particles such as organic silicon, polystyrene and polycarbonate or from one or more inorganic scattering particles such as titanium dioxide, zirconium dioxide, vanadium dioxide, tin dioxide, aluminum oxide and barium titanate. The particle diameters of the first scattering particles and the second scattering particles are 10nm-2500 nm.
In the present embodiment, the first scattering particles 412 and the second scattering particles 413 are continuously distributed in a direction from the side of the diffusion pixel unit 41 close to the blue light emitting layer 30 toward the side far from the blue light emitting layer 30.
In another embodiment, referring to fig. 6, the step of forming the diffusion pixel unit includes:
mixing the first scattering particles 412 in a matrix solution, patterning and curing into a first film layer 4111 by a wet process; this step may also be repeated multiple times;
patterning and curing the matrix solution on the first film layer into a matrix film layer through a wet process;
the second scattering particles are mixed in the matrix solution, and patterned and cured on the matrix film layer to form the second film layer 4112 by a wet process, which may also be repeated multiple times.
The first scattering particles 412 and the second scattering particles 413 of the color conversion layer thus formed are discontinuously distributed, i.e., the first scattering particles 412 having a large size and a low molar concentration are dispersed only on the light incident side, i.e., the side close to the blue light emitting layer 30, and the second scattering particles 413 having a small size and a high molar concentration are dispersed only on the light emitting side, i.e., the side away from the blue light emitting layer 30.
In the present embodiment, the first scattering particles 412 and the second scattering particles 413 are added only to the blue pixel cell 41B, and the first scattering particles 412 and the second scattering particles 413 are not added to the red pixel cell 41R and the green pixel cell 41G. In other embodiments of the present invention, the first scattering particles 412 and the second scattering particles 413 are also added to the red pixel unit 41R and the green pixel unit 41G in order to improve the light efficiency of the red pixel unit 41R and the green pixel unit 41G. In order to balance the luminance difference between the pixel units, the particle diameters and molar concentrations of the first and second scattering particles 412 and 413 added to the red and green pixel units 41R and 41G may be adjusted to be different from those of the first and second scattering particles 412 and 413 added to the blue pixel unit 41B. For example, on the side close to the blue light emitting layer 30, the first scattering particles 412 in the red pixel unit 41R and the green pixel unit 41G have a smaller particle size than the first scattering particles 412 in the blue pixel unit 41B and a higher molar concentration than the first scattering particles 412 in the blue pixel unit 41B. On the side away from the blue light emitting layer 30, the second scattering particles 413 in the red pixel unit 41R and the green pixel unit 41G have a larger particle size than the second scattering particles 413 in the blue pixel unit 41B and a lower molar concentration than the second scattering particles 413 in the blue pixel unit 41B.
The organic light emitting diode display panel has the advantages that the first scattering particles and the second scattering particles are added in the blue pixel unit, the first scattering particle films with large sizes and low molar concentrations are dispersed on the light inlet side, namely the side close to the blue light emitting layer, the blue light is converged and enhanced to be emitted to the light outlet side, and excitation of a color conversion material is promoted. The second scattering particle film with small size and high molar concentration is dispersed on the light emitting side, namely the side far away from the blue light emitting layer, so that light scattering is enhanced, the light emitting efficiency is improved, and the problems of small visual angle and low brightness of a blue pixel unit can be solved. In addition, first scattering particles and second scattering particles may be added to the green pixel cell and the red pixel cell to improve light efficiency.
The foregoing provides a detailed description of embodiments of the present application, and the principles and embodiments of the present application have been described herein using specific examples, which are presented only to aid in the understanding of the present application. Meanwhile, for those skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
Claims (8)
1. A display panel, comprising: the light-emitting diode comprises a first substrate, a second substrate arranged opposite to the first substrate, and a blue light emitting layer and a color conversion layer which are arranged between the first substrate and the second substrate in a stacked mode, wherein the color conversion layer is arranged on the light emitting side of the blue light emitting layer, the color conversion layer comprises a plurality of diffusion pixel units, each diffusion pixel unit comprises a matrix and first scattering particles and second scattering particles, the first scattering particles are dispersed in the matrix, the first scattering particles are located on the side, close to the blue light emitting layer, of the color conversion layer, the second scattering particles are located on the side, far away from the blue light emitting layer, of the color conversion layer, the molar concentration of the first scattering particles is smaller than that of the second scattering particles, and the particle size of the first scattering particles is larger than that of the second scattering particles;
the color conversion layer comprises a red pixel unit, a green pixel unit and a blue pixel unit which are arranged, the matrix of the red pixel unit and the matrix of the green pixel unit comprise color conversion materials, the matrix of the blue pixel unit does not comprise the color conversion materials, and the blue pixel unit is the diffusion pixel unit;
the diffusion pixel unit further comprises the red pixel unit and the green pixel unit, the particle size of the first scattering particles in the red pixel unit and the green pixel unit is smaller than that of the first scattering particles in the blue pixel unit on the side close to the blue light emitting layer, the molar concentration of the first scattering particles in the red pixel unit and the green pixel unit is higher than that of the first scattering particles in the blue pixel unit, the particle size of the second scattering particles in the red pixel unit and the green pixel unit is larger than that of the second scattering particles in the blue pixel unit on the side far from the blue light emitting layer, and the molar concentration of the second scattering particles in the red pixel unit and the green pixel unit is lower than that of the second scattering particles in the blue pixel unit.
2. The display panel of claim 1, wherein the first scattering particles and the second scattering particles are distributed continuously in a direction from a side of the diffusion pixel unit closer to the blue light emitting layer toward a side farther from the blue light emitting layer.
3. The display panel according to claim 1 or 2, wherein the matrix includes a first film layer and a second film layer which are stacked, the first scattering particles being dispersed in the first film layer, and the second scattering particles being dispersed in the second film layer.
4. The display panel according to claim 3, wherein the first scattering particles dispersed in each of the first film layers have the same particle size and molar concentration, and the second scattering particles dispersed in each of the second film layers have the same particle size and molar concentration.
5. The display panel according to claim 1, wherein particle diameters of the first scattering particles and the second scattering particles become gradually smaller in a direction from a side of the diffusion pixel unit closer to the blue light emission layer toward a side farther from the blue light emission layer.
6. The display panel according to claim 1 or 5, wherein the molar concentrations of the first scattering particles and the second scattering particles become gradually larger in a direction from a side of the diffusion pixel unit closer to the blue light emitting layer toward a side farther from the blue light emitting layer.
7. A method of manufacturing a display panel, comprising the steps of:
providing a first substrate and a second substrate arranged opposite to the first substrate; and
forming a blue light emitting layer on the first substrate, forming a color conversion layer on the first substrate or the second substrate, and attaching the first substrate and the second substrate to enable the color conversion layer to be positioned on the light emitting side of the blue light emitting layer;
wherein the color conversion layer includes a plurality of diffusion pixel units, and the step of forming the diffusion pixel units includes:
mixing the first scattering particles in a matrix solution, patterning and curing into a first film layer through a wet process;
mixing second scattering particles in a matrix solution, patterning and curing the second scattering particles on the first film layer into a second film layer through a wet process;
the first scattering particles and the second scattering particles are respectively one of first scattering particles and second scattering particles,
the film layer formed by the first scattering particles is positioned on one side of the color conversion layer close to the blue light emitting layer, the film layer formed by the second scattering particles is positioned on one side of the color conversion layer far away from the blue light emitting layer,
the molar concentration of the first scattering particles is less than that of the second scattering particles, and the particle size of the first scattering particles is greater than that of the second scattering particles;
the color conversion layer comprises a red pixel unit, a green pixel unit and a blue pixel unit which are arranged, the matrix of the red pixel unit and the matrix of the green pixel unit comprise color conversion materials, the matrix of the blue pixel unit does not comprise the color conversion materials, and the blue pixel unit is the diffusion pixel unit;
the diffusion pixel unit further comprises the red pixel unit and the green pixel unit, the particle size of the first scattering particles in the red pixel unit and the green pixel unit is smaller than that of the first scattering particles in the blue pixel unit on the side close to the blue light emitting layer, the molar concentration of the first scattering particles in the red pixel unit and the green pixel unit is higher than that of the first scattering particles in the blue pixel unit, the particle size of the second scattering particles in the red pixel unit and the green pixel unit is larger than that of the second scattering particles in the blue pixel unit on the side far from the blue light emitting layer, and the molar concentration of the second scattering particles in the red pixel unit and the green pixel unit is lower than that of the second scattering particles in the blue pixel unit.
8. The method for manufacturing a display panel according to claim 7, wherein: the step of forming the diffusion pixel cell further comprises: the method further includes the step of patterning and curing the matrix solution on the first film layer into a matrix film layer by a wet process prior to the step of mixing the second scattering particles in the matrix solution, patterning and curing the second scattering particles on the first film layer into a second film layer by a wet process.
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