A display panel and a display device

Abstract

An embodiment of the present invention provides a display panel and a display device. The display panel includes a substrate, a light-emitting device layer, and a light-adjusting structure layer; the light-emitting device layer is located between the substrate and the light-adjusting structure layer, and the light-emitting device layer includes a plurality of light-emitting devices; the light-adjusting structure layer includes a light-adjusting unit and a dielectric layer covering the light-adjusting unit, and a light-adjusting portion of the light-adjusting unit is disposed around a through hole, and the through hole overlaps with the light-emitting device; in a direction from the through hole to the light-adjusting portion, the thickness of the light-adjusting portion gradually increases. The light-emitting device includes a first light-emitting device and a second light-emitting device having different emission colors, the emission area of the first light-emitting device is larger than that of the second light-emitting device, and the thickness change rate of the first light-adjusting portion corresponding to the first light-emitting device is smaller than the thickness change rate of the second light-adjusting portion corresponding to the second light-emitting device.

Description

[0001] This application is a divisional application filed based on the patent application with the application date of May 6, 2020, application number 202010374758.7, and invention title "A display panel, its manufacturing method and display device". Technical Field

[0002] The present invention relates to the field of display technologies, and particularly to a display panel and a display device. Background Art

[0003] Currently, the mainstream display devices include liquid crystal display devices and organic light-emitting display devices. Among them, in liquid crystal display devices, since liquid crystals do not emit light, a backlight module for providing light source for the liquid crystal display panel needs to be provided, which results in a relatively thick overall thickness and large weight of the display device. In organic light-emitting display devices, organic light-emitting diodes (OLEDs, Organic Light Emitting Display) are used as light-emitting devices, which have the characteristic of self-luminescence, do not require an additional light source, are beneficial to the overall thinness and lightness of the display device, and can realize the production of flexible display screens. In addition, organic self-luminescent display technology also has characteristics such as fast response speed and wide viewing angle. Therefore, organic self-luminescent display technology has become the focus of current research. However, in current organic light-emitting display technologies, some large-angle light emitted by the light-emitting devices is restricted inside the display panel and cannot be emitted from the display panel to contribute to pixel luminescence, which affects the overall light extraction efficiency of the light-emitting devices. Summary of the Invention

[0004] Embodiments of the present invention provide a display panel and a display device to solve the technical problem that the low light extraction efficiency of the light-emitting device affects the power consumption of the display panel.

[0005] In a first aspect, an embodiment of the present invention provides a display panel, including:

[0006] A substrate;

[0007] A light-emitting device layer located on the substrate, the light-emitting device layer including a plurality of light-emitting devices;

[0008] A light adjustment structure layer located on the side of the light-emitting device layer away from the substrate, including a light adjustment unit and a dielectric layer covering the light adjustment unit, the light adjustment unit including through holes that overlap with the light-emitting devices;

[0009] The light adjustment unit includes a dimming part that is arranged around the through hole;

[0010] The plurality of light-emitting devices include a first light-emitting device and a second light-emitting device with different emission colors, and the emission area of the first light-emitting device is larger than the emission area of the second light-emitting device;

[0011] The through holes include a first through hole and a second through hole. The first light-emitting device overlaps with the first through hole, and the second light-emitting device overlaps with the second through hole.

[0012] The light-dimming part around the first through hole is a first light-dimming part, and the light-dimming part around the second through hole is a second light-dimming part.

[0013] In the direction from the first through hole to the first light-dimming part, the thickness change rate of the first light-dimming part is γ1. In the direction from the second through hole to the second light-dimming part, the thickness change rate of the second light-dimming part is γ2, and γ2 > γ1.

[0014] The thickness change rate represents the ratio of the thickness change amount of the light-dimming part to the length change amount of the light-dimming part. Wherein, the length change amount of the light-dimming part represents the length change amount of the light-dimming part in the direction from the through hole to the light-dimming part, and the thickness change amount of the light-dimming part represents the thickness change amount of the light-dimming part in the direction perpendicular to the substrate.

[0015] In a second aspect, an embodiment of the present invention further provides a display device, including the display panel provided in any embodiment of the present invention.

[0016] The display panel and the display device provided by the embodiments of the present invention have the following beneficial effects: In the embodiments of the present invention, a light adjustment structure layer is fabricated on the light-emitting device layer. The light adjustment structure layer can adjust the optical path of the large-angle light emitted by the light-emitting device, improve the light extraction efficiency of the light-emitting device, and thus reduce the power consumption of the display panel. In addition, in the embodiments of the present invention, γ2 > γ1 is set. Compared with the second light-dimming part, the first light-dimming part can play a role in changing the optical path of more large-angle light, that is, compared with the second light-dimming part, the first light-dimming part has a more obvious effect on improving the light extraction efficiency of the light-emitting device. The first light-dimming part corresponds to the first light-emitting device with a larger light-emitting area, which can balance the difference in light-emitting efficiency between the first light-emitting device and the second light-emitting device and improve the display effect of the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1 It is a cross-sectional schematic diagram of a display panel in the related art;

[0019] Figure 2 A partial top view schematic diagram of the display panel provided by the embodiment of the present invention;

[0020] Figure 3 is Figure 2 a schematic cross-sectional view at the position of the median tangent A-A';

[0021] Figure 4 Another cross-sectional schematic diagram of the display panel provided by the embodiment of the present invention;

[0022] Figure 5 Another cross-sectional schematic diagram of the display panel provided by the embodiment of the present invention;

[0023] Figure 6 Another cross-sectional schematic diagram of the display panel provided by the embodiment of the present invention;

[0024] Figure 7 Another cross-sectional schematic diagram of the display panel provided by the embodiment of the present invention;

[0025] Figure 8 Another cross-sectional schematic diagram of the display surface provided by the embodiment of the present invention;

[0026] Figure 9 Another partial top view schematic diagram of the display panel provided by the embodiment of the present invention;

[0027] Figure 10 is Figure 9 a schematic cross-sectional view at the position of the median tangent B-B';

[0028] Figure 11 is Figure 10 a schematic diagram of the principle corresponding to the embodiment;

[0029] Figure 12 Another cross-sectional schematic diagram of the display panel provided by the embodiment of the present invention;

[0030] Figure 13 Another cross-sectional schematic diagram of the display panel provided by the embodiment of the present invention;

[0031] Figure 14 Another simplified cross-sectional diagram of the display panel provided by the embodiment of the present invention;

[0032] Figure 15 Another top view schematic diagram of the display panel provided by the embodiment of the present invention;

[0033] Figure 16 Another cross-sectional schematic diagram of the display panel provided by the embodiment of the present invention;

[0034] Figure 17Another cross-sectional schematic diagram of the display panel provided by the embodiment of the present invention;

[0035] Figure 18 Another cross-sectional schematic diagram of the display panel provided by the embodiment of the present invention;

[0036] Figure 19 is Figure 18 The principle schematic diagram of the corresponding embodiment;

[0037] Figure 20 Schematic diagram of the display device provided by the embodiment of the present invention;

[0038] Figure 21 The flowchart of the manufacturing method of the display panel provided by the embodiment of the present invention Figure 1 ;

[0039] Figure 22 The flowchart of the manufacturing method of the display panel provided by the embodiment of the present invention Figure 2

[0040] Figure 23 The flowchart of the manufacturing method of the display panel provided by the embodiment of the present invention Figure 3 . Detailed implementation manners

[0041] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0042] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The singular forms of "a", "the" and "said" used in the embodiments of the present invention and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0043] Figure 1 Cross-sectional schematic diagram of the display panel in the related art, such as Figure 1As shown, in the related art, there are also multiple film layer structures disposed on the light-emitting device P', such as a packaging structure layer 11', an optical adhesive layer 12', a protective cover plate 13', etc. Since the manufacturing materials of each film layer are different, the refractive indices of each film layer are different. During display, the light-emitting device P' emits light in multiple directions. As shown in the figure, both the light ray S1' and the light ray S2' can emit out of the display panel and contribute to the light emission of the pixel. However, the light ray S3' satisfies the condition of total reflection at the film layer interface inside the display panel, and after total reflection, the light ray S3' is restricted inside the display panel. The light ray S4' undergoes total reflection at the interface between the display panel and the air and is restricted inside the display panel. Both the light ray S3' and the light ray S4' cannot emit out of the display panel, thus affecting the light extraction efficiency of the light-emitting device.

[0044] Based on the above problems, embodiments of the present invention provide a display panel, a manufacturing method thereof, and a display device. By disposing a light adjustment structure layer above the light-emitting device layer, the light with a larger angle emitted by the light-emitting device can have its light path changed by the light adjustment units in the light adjustment structure layer, reducing the angle between the light propagation direction and the direction perpendicular to the substrate, which is equivalent to reducing the light extraction angle of the large-angle light. Thus, the light with a larger angle emitted by the light-emitting device can also emit out of the display panel and contribute to the light emission of the pixel, improving the light extraction efficiency of the light-emitting device and reducing the power consumption of the display panel. The following embodiments will provide detailed examples of the implementation manners of the present invention.

[0045] Figure 2 It is a partial top view schematic diagram of the display panel provided by an embodiment of the present invention. Figure 3 is Figure 2 a cross-sectional schematic diagram at the position of the tangent line A-A' in

[0046] As Figure 3 only simplifies and schematically shows the structure of the display panel. The display panel includes: a substrate 101, a light-emitting device layer 102, and a light adjustment structure layer 103; the light-emitting device layer 102 is located above the substrate 101, and the light-emitting device layer 102 includes multiple light-emitting devices P ( Figure 3 only two are schematically shown in the figure); the light adjustment structure layer 103 is located on the side of the light-emitting device layer 102 away from the substrate 101, and the light adjustment structure layer 103 includes multiple light adjustment units 31 and a dielectric layer 32 covering the multiple light adjustment units 31. Among them, the dielectric layer 32 can be a continuous film layer structure of a single layer, or the dielectric layer 32 can also be a patterned film layer. The dielectric layer 32 includes multiple dielectric units, and one dielectric unit covers one light adjustment unit 31. Figure 3 In the figure, the dielectric layer 32 is schematically shown as a continuous film layer structure of a single layer. The refractive index n11 of the light adjustment unit 31 is less than the refractive index n22 of the dielectric layer 32. Also refer to Figure 2 and Figure 3As shown in the figure, each light adjustment unit 31 includes a dimming section F. Each light adjustment unit 31 includes a through hole K. The through hole K penetrates the light adjustment unit 31 in the direction e perpendicular to the substrate (when the display panel is a flat panel display panel, the direction e perpendicular to the substrate is the same as the direction perpendicular to the display panel). The through hole K overlaps with the light emitting device P, and the dimming section F is arranged around the through hole K; wherein, as Figure 3 shown, for a light adjustment unit 31, in the direction from the through hole K to the dimming section F, the thickness of the dimming section F gradually increases.

[0047] In the embodiment of the present invention, a light adjustment structure layer 103 is arranged above the light emitting device P. The refractive index n11 of the light adjustment unit 31 in the light adjustment structure layer 103 is less than the refractive index n22 of the dielectric layer 32. When the light emitted by the light emitting device P irradiates on the interface (i.e., the interface) where the light adjustment unit 31 and the dielectric layer 32 contact, refraction will occur. As Figure 3 shown in the simplified optical path diagram, the light ray S1 emitted by the light emitting device P irradiates on the interface where the light adjustment unit 31 and the dielectric layer 32 contact. The incident angle of the light ray S1 is θ1, and the refraction angle after entering the dielectric layer 32 is θ2. According to the refraction law: n11 * sinθ1 = n22 * sinθ2. Since n11 < n22, then sinθ1 > sinθ2, so θ1 > θ2, that is, the incident angle is greater than the refraction angle. After the light ray S1 is refracted at the interface between the light adjustment unit 31 and the dielectric layer 32, the included angle between the propagation direction and the direction e becomes smaller, which is equivalent to reducing the light emission angle of the large-angle light emitted by the light emitting device P. Similarly, the light ray S2 also changes its optical path after being refracted at the interface between the light adjustment unit 31 and the dielectric layer 32. For the display panel provided by the embodiment of the present invention, the light adjustment structure layer can adjust the optical path of the large-angle light emitted by the light emitting device, reduce the included angle between this part of the light and the direction perpendicular to the substrate, thereby reducing the probability of total reflection of this part of the light on the film interface in the display panel or on the interface between the display panel and the air, improving the light emission efficiency of the light emitting device, and thus reducing the power consumption of the display panel.

[0048] Continue to refer to Figure 1 shown, the dielectric layer 32 is a planarization layer. In the embodiment of the present invention, by arranging a light adjustment structure layer above the light emitting device, the optical path of the large-angle light emitted by the light emitting device can be adjusted, reducing the included angle between the light and the direction perpendicular to the display panel, and reducing the probability of total reflection of the light in the display panel and being confined in the display panel, improving the light emission efficiency of the light emitting device. In addition, since the dielectric layer is a planarization layer, the entire planarization layer made during manufacturing can cover all the light adjustment units, and there is no need to etch the dielectric layer again, and the process is simple. Moreover, the planarization layer can provide a flat surface for the light adjustment structure layer, which is beneficial to the flatness on the light-emitting surface side of the display panel.

[0049] Specifically, the interface between the light-dimming part and the dielectric layer is an arc surface. Among them, the arc surface can be a convex surface protruding from the light-emitting device layer toward the side away from the substrate, or a concave surface formed by the light-dimming part recessing toward the light-emitting device layer. Since the interface between the light-dimming part and the dielectric layer is an arc surface, the normal directions corresponding to different parts of the arc surface are different. Therefore, the light rays of the same angle emitted by the light-emitting device have different propagation directions after refraction when irradiating different parts of the arc surface. After the large-angle light rays emitted by the light-emitting device are refracted at the interface between the light-dimming part and the dielectric layer, while changing the propagation direction of the light, the light rays can also propagate in multiple different directions, thereby improving the light extraction efficiency of the light-emitting device while ensuring the uniform divergence of the light rays.

[0050] As Figure 3 shown, the interface between the light-dimming part F and the dielectric layer 32 is a convex surface protruding from the light-emitting device layer 102 toward the side away from the substrate 101.

[0051] In another embodiment, as Figure 4 shown, Figure 4 is another cross-sectional schematic diagram of the display panel provided by the embodiment of the present invention. The interface between the light-dimming part F and the dielectric layer 32 is a concave surface. The figure schematically shows the relatively large-angle light rays S3 and S4 emitted by the light-emitting device P. Taking the light ray S3 as an example, its incident angle on the interface between the light-dimming part F and the dielectric layer 32 is θ3, and the refraction angle after entering the dielectric layer 32 is θ4. According to the refraction law: n11*sinθ3 = n22*sinθ4. Since n11 < n22, then sinθ3 > sinθ4, so θ3 > θ4. That is to say, the included angle between the propagation direction of the light ray S3 after refraction at the interface between the light-dimming part F and the dielectric layer 32 and the direction e becomes smaller, reducing the probability that the light is totally reflected in the display panel and restricted within the display panel.

[0052] Optionally, the interface between the light-dimming part and the dielectric layer can also be a slope surface, that is, in the cross-sectional schematic diagram, the interface between the light-dimming part and the dielectric layer is approximately a straight line, and no further drawings are shown here.

[0053] In one embodiment, the orthographic projection of the light adjustment unit 31 on the substrate 101 is annular. Continuing to refer to Figure 2 the top view shown, the projection direction of the light adjustment unit 31 onto the substrate 101 is the same as the top view direction. Then, in the top view, the light adjustment unit 31 coincides with its orthographic projection on the substrate 101 (not marked in the figure), and it can be seen from the top view that the light adjustment unit 31 is annular. Continuing to refer to Figure 3As shown in the figure, the light adjustment unit 31 includes a first surface M1 on the side away from the substrate 101, and the first surface M1 bulges toward the side away from the substrate 101. In this embodiment, the light adjustment unit 31 is equivalent to an annular convex lens structure. There is a through hole in the center of the annular convex lens, and the through hole overlaps with the light-emitting device. The inner part of the annular convex lens is the dimming part. After the light with a large angle emitted by the light-emitting device is incident on the inner part of the annular convex lens, refraction will occur at the interface between the annular convex lens and the dielectric layer. After refraction, the included angle between the propagation direction of the light and the direction perpendicular to the display panel becomes smaller, thereby reducing the probability of total internal reflection of this part of the light inside the display panel and improving the light extraction efficiency of the light-emitting device. During manufacturing, the light adjustment unit can be fabricated using an inkjet printing process. Ink droplets are sprayed at the position corresponding to each light adjustment unit. The evaporation rate of the solvent at the edge of the ink droplet is much greater than the loss rate of its liquid volume. Therefore, the solvent replenishes from the central region to the edge, forming a capillary flow from the inside to the outside, causing the solute in the ink to accumulate at the edge. The solute in the ink is the material for fabricating the light adjustment unit. After the solvent evaporates, a light adjustment unit with a through hole is formed; then a dielectric layer is fabricated on top of the multiple light adjustment units. The manufacturing process of the light adjustment structure layer in this embodiment is simple, and the specific manufacturing method will be described in detail in the following manufacturing method embodiments.

[0054] Figure 2 Only the orthographic projection of the light adjustment unit 31 on the substrate 101 is shown as a ring in the figure. In another embodiment, the orthographic projection of the light adjustment unit 31 on the substrate 101 can also be a rectangular ring. In another embodiment, the shape of the light adjustment unit 31 is substantially the same as the shape of the outer edge of the light-emitting device P in the top view. In one embodiment, Figure 5 Another cross-sectional schematic diagram of the display panel provided by the embodiment of the present invention is shown in Figure 5As shown, an array layer 107 is further included above the substrate 101. The array layer 107 includes a plurality of thin film transistors T, and the thin film transistor T with a top gate structure is schematically shown in the figure. Optionally, the thin film transistor can also be a bottom gate structure. The light-emitting device P in the light-emitting device layer 102 includes an anode 7, a light-emitting layer 8, and a cathode 9 stacked in sequence, wherein the thin film transistor T is connected to the anode 7. A packaging layer 104 is further provided above the light-emitting device layer 102. The packaging layer 104 includes two inorganic packaging layers w and one organic packaging layer y, and the organic packaging layer y is located between the two inorganic packaging layers w. The light-emitting material in the light-emitting layer 8 is sensitive to water and oxygen. The setting of the packaging layer 104 can play a role in packaging and protecting the light-emitting device, thereby isolating the invasion of water and oxygen and ensuring the service life of the light-emitting device P. In the packaging layer 104, the inorganic packaging layer w has high density and can well block water and oxygen molecules. The organic molecules in the organic packaging layer y have good flexibility and can help the inorganic packaging layer w release stress and prevent cracks from occurring in the inorganic packaging layer w. The light adjustment structure layer 103 is located on the side of the packaging layer 104 away from the light-emitting device layer 102.

[0055] In one embodiment, Figure 6 Another cross-sectional schematic diagram of the display panel provided by the embodiment of the present invention is as Figure 6 shown. The display panel includes a packaging layer 104, and the packaging layer 104 is located between the light-emitting device layer 102 and the light adjustment structure layer 103. The light-emitting device P in the figure is only schematically simplified. The packaging layer 104 includes at least one inorganic packaging layer w (only two layers are schematically shown in the figure) and at least one organic packaging layer y (only one layer is schematically shown in the figure). In the packaging layer 104, the inorganic packaging layer w and the organic packaging layer y are alternately stacked, and the refractive indices of the inorganic packaging layer w and the organic packaging layer y are different. Usually, the refractive index of the organic packaging layer y is less than that of the inorganic packaging layer w. After the light emitted by the light-emitting device P enters the packaging layer 104, part of the large-angle light will undergo total reflection at the interface between the organic packaging layer y and the inorganic packaging layer w (the simplified light path diagram schematically shown in the figure) and cannot exit the display panel again, which has a certain impact on the light extraction efficiency of the light-emitting device. After the design of the present invention, the light adjustment structure layer is provided on the side of the packaging layer away from the light-emitting device layer. The light emitted by the light-emitting device first enters the packaging layer, then exits from the packaging layer and enters the light adjustment structure layer. The light adjustment structure layer can adjust the propagation direction of at least part of the large-angle light entering it, avoid more large-angle light from undergoing total reflection in the display panel and being unable to exit the display panel, reduce the probability of total reflection of light in the display panel, and improve the light extraction efficiency of the light-emitting device.

[0056] Further, in some embodiments, the display panel further includes a touch film group layer, as Figure 7 shown, Figure 7Another cross-sectional schematic diagram of the display panel provided by the embodiment of the present invention. The display panel includes a packaging layer 104 and a touch film group layer 105. Both the packaging layer 104 and the touch film group layer 105 are located between the light-emitting device layer 102 and the light-adjusting structure layer 103. Among them, the packaging layer 104 is located on the side of the touch film group layer 105 close to the light-emitting device layer 102. The packaging layer 104 includes at least one inorganic packaging layer w (only two layers are schematically shown in the figure) and at least one organic packaging layer y (only one layer is schematically shown in the figure). In the figure, the touch film group layer is only schematically simplified. Optionally, the touch film group layer includes an electrode array composed of a plurality of block-shaped touch electrodes. In the electrode array, the plurality of block-shaped touch electrodes are arranged in electrode rows in the row direction, and the plurality of block-shaped touch electrodes are arranged in electrode columns in the column direction. Any two adjacent block-shaped touch electrodes in an electrode row are electrically connected, and any two adjacent block-shaped touch electrodes in an electrode column are electrically connected. The embodiment of the present invention provides a display panel with a touch function. By manufacturing the touch film group layer on the packaging layer, the thickness of the touch film group layer is relatively thin. Compared with the solution of attaching the touch film group on the display panel, it is beneficial to reduce the overall thickness of the panel. And by arranging the light-adjusting structure layer on the side of the touch film group layer away from the light-emitting device layer, it is possible to adjust the optical path of the light emitted by the light-emitting device that still has a relatively large light-emitting angle after passing through the touch film group layer, reduce the probability of total internal reflection of the light in the display panel, and improve the light-emitting efficiency of the light-emitting device.

[0057] In one embodiment, continue to refer to the above Figure 2 As shown, two adjacent light-adjusting units 31 are independent of each other. In the direction perpendicular to the substrate 101, the light-emitting device P overlaps with the through hole K of the light-adjusting unit 31, that is, one light-emitting device P corresponds to one light-adjusting unit 31. By setting two adjacent light-adjusting units 31 to be independent of each other, the light-adjusting part in each light-adjusting unit can adjust the large-angle light emitted by the corresponding light-emitting unit, and avoid interference between the light-adjusting effects of adjacent light-adjusting units.

[0058] In another embodiment, two adjacent light-adjusting units are in contact with each other. Figure 8 Another cross-sectional schematic diagram of the display surface provided by the embodiment of the present invention. As Figure 8 shown, for two adjacent light-emitting devices P1 and P2, the light-adjusting unit 311 corresponds to the light-emitting device P1, and the light-adjusting unit 312 corresponds to the light-emitting device P2. The light-adjusting unit 311 is in contact with the light-adjusting unit 312. Due to manufacturing process reasons or limitations on the size of the light-adjusting unit, some adjacent light-adjusting units in the display panel are in contact with each other. As long as it is ensured that the through hole of the light-adjusting unit overlaps with the light-emitting device, and for one light-adjusting unit, the thickness of the light-adjusting part arranged around the through hole gradually increases in the direction from the through hole to the light-adjusting part.

[0059] In some embodiments, among the multiple light-emitting devices in the display panel provided by the embodiments of the present invention, there are a first light-emitting device and a second light-emitting device with different emission colors, and the emission area of the first light-emitting device is larger than that of the second light-emitting device. Since the emission colors of the light-emitting devices are different, the light-emitting materials selected in the light-emitting devices are different. Correspondingly, the luminous efficiencies of different light-emitting materials are different. In the embodiments of the present invention, by adjusting the emission area of the light-emitting device, the influence of the luminous efficiency of the light-emitting device on the emission brightness is balanced. Among them, the luminous efficiency of the first light-emitting device is less than that of the second light-emitting device, and the emission area of the first light-emitting device is set to be larger than that of the second light-emitting device, so as to enable light-emitting devices of different colors to cooperate with each other for color display.

[0060] The multiple light-emitting devices include a red light-emitting device, a green light-emitting device, and a blue light-emitting device. In one embodiment, the emission area of the blue light-emitting device is larger than that of the red light-emitting device, the emission area of the blue light-emitting device is larger than that of the green light-emitting device, and the emission area of the green light-emitting device is larger than that of the red light-emitting device. In another embodiment, the emission area of the blue light-emitting device is larger than that of the red light-emitting device, the emission area of the blue light-emitting device is larger than that of the green light-emitting device, and the emission area of the green light-emitting device is equal to that of the red light-emitting device. Since the difference in luminous efficiency between the green light-emitting device and the red light-emitting device is small, setting the emission areas of the green light-emitting device and the red light-emitting device to be equal has little impact on the display effect. However, the difference in luminous efficiency between the blue light-emitting device and the red light-emitting device and the green light-emitting device is large. Only making a differential design for the emission area of the blue light-emitting device is relatively simple in terms of process.

[0061] In one embodiment, Figure 9 is another partial top view schematic diagram of the display panel provided by the embodiments of the present invention. Figure 10 is Figure 9 a cross-sectional schematic diagram at the position of the mid-tangent B-B'. Figure 11 is Figure 10 a principle schematic diagram corresponding to the embodiment.

[0062] Such as Figure 9As shown, a first light-emitting device Pa and a second light-emitting device Pb with different emission colors are shown. The light-emitting area of the first light-emitting device Pa is larger than that of the second light-emitting device Pb. The plurality of light adjustment units include a first light adjustment unit 31a and a second light adjustment unit 31b. The first light adjustment unit 31a includes a first through-hole K1 and a first light-dimming section F1 surrounding the first through-hole K1. The second light adjustment unit 31b includes a second through-hole K2 and a second light-dimming section F2 surrounding the second through-hole K2. The first light-emitting device Pa overlaps with the first through-hole K1, and the second light-emitting device Pb overlaps with the second through-hole K2. That is, the first light-emitting device Pa corresponds to the first light adjustment unit 31a, and the second light-emitting device Pb corresponds to the second light adjustment unit 31b.

[0063] As Figure 10 Schematically, for a first light adjustment unit 31a, in the direction from the first through-hole K1 to the first light-dimming section F1, the thickness change rate of the first light-dimming section F1 is γ1. For a second light adjustment unit 31b, in the direction from the second through-hole K2 to the second light-dimming section F2, the thickness change rate of the second light-dimming section F2 is γ2, and γ2 > γ1. Herein, the thickness change rate is understood as the ratio of the thickness change amount of the light-dimming section to the length change amount of the light-dimming section. The length increase amount of the light-dimming section is, that is, the length change amount of the light-dimming section in the direction from the first through-hole to the first light-dimming section in the cross-sectional view. The thickness change amount of the light-dimming section is, that is, the thickness change amount of the light-dimming section in the direction e in the cross-sectional view.

[0064] As Figure 11Simplified schematic diagram, where J1 and J2 represent two dimming sections with different thickness change rates. In the cross-sectional view, from point C to point D in the figure, the thickness change rate of dimming section J2 is greater than that of dimming section J1, with the line passing through point D and parallel to direction e (i.e., perpendicular to the substrate) as the boundary. The light ray S5 emitted by the light-emitting device P shoots towards the intersection of dimming section J1 and the boundary. The light ray S5 can refract at the interface between dimming section J1 and the dielectric layer to change the light path; the light ray S6 emitted by the light-emitting device P shoots towards the intersection of dimming section J2 and the boundary. The light ray S6 can refract at the interface between dimming section J2 and the dielectric layer to change the light path; the angle between light ray S5 and direction e is β2, and the angle between light ray S6 and direction e is β1, and β1 < β2. That is to say, dimming section J2 cannot change the light path of light ray S5. The light with a larger angle emitted by the light-emitting device P is more likely to have its light path changed by the dimming section with a smaller thickness change rate. Therefore, in the embodiment of the present invention, γ2 > γ1 is set. Compared with the second dimming section, the first dimming section can change the light path of more large-angle light rays, that is, compared with the second dimming section, the first dimming section has a more obvious effect on improving the light extraction efficiency of the light-emitting device. The first dimming section corresponds to the first light-emitting device with a larger light-emitting area, which can further balance the difference in light-emitting efficiency between the first light-emitting device and the second light-emitting device and improve the display effect of the display panel.

[0065] Specifically, in one embodiment, the light-emitting area of the blue light-emitting device > the light-emitting area of the green light-emitting device > the light-emitting area of the red light-emitting device. Figure 12 Another cross-sectional schematic diagram of the display panel provided by the embodiment of the present invention, as Figure 12 shown, the blue light-emitting device PB corresponds to the light adjustment unit 31B, and the light adjustment unit 31B includes a dimming section FB; the green light-emitting device PG corresponds to the light adjustment unit 31G, and the light adjustment unit 31G includes a dimming section FG; the red light-emitting device PR corresponds to the light adjustment unit 31R, and the light adjustment unit 31R includes a dimming section FR. For a light adjustment unit, in the direction from the through hole to the dimming section, the thickness change rate of dimming section FB is the smallest, and the thickness change rate of dimming section FR is the largest. Thus, among the dimming sections corresponding to the light-emitting devices of the three colors, dimming section FB can change the light path of more large-angle light rays. Dimming section FB has the greatest effect on improving the light extraction efficiency of the blue light-emitting device PB, dimming section FR has the smallest effect on improving the light extraction efficiency of the red light-emitting device PR, and dimming section FG has a medium effect on improving the light extraction efficiency of the green light-emitting device PG. By designing the dimming sections corresponding to the light-emitting devices of the three colors differently, while ensuring the improvement of the light extraction efficiency of each color light-emitting device, it is also possible to balance the difference in light-emitting efficiency between different light-emitting devices and improve the display effect of the display panel.

[0066] In another embodiment, the light-emitting area of the green light-emitting device is the same as that of the red light-emitting device, and both are smaller than the light-emitting area of the blue light-emitting device. For a light adjustment unit, in the direction from the through hole to the dimming section, the thickness change rate of the dimming section corresponding to the green light-emitting device is equal to the thickness change rate of the dimming section corresponding to the red light-emitting device, and both are greater than the thickness change rate of the dimming section corresponding to the blue light-emitting device. The difference in luminous efficiency between the blue light-emitting device and the red and green light-emitting devices is relatively large. In this embodiment, only the light-emitting area of the blue light-emitting device and the corresponding dimming section are designed differently, which is relatively simple in terms of process.

[0067] In one embodiment, Figure 13 Another cross-sectional schematic diagram of the display panel provided by the embodiment of the present invention. Figure 14 Another simplified cross-sectional view of the display panel provided by the embodiment of the present invention. As Figure 13 shown, the first light adjustment unit 31a corresponds to the first light-emitting device Pa, the second light adjustment unit 31b corresponds to the second light-emitting device Pb, the first light-emitting device Pa and the second light-emitting device Pb have different light-emitting colors, and the light-emitting area of the first light-emitting device Pa is larger than that of the second light-emitting device Pb. The minimum distance from the inner side of the first light adjustment unit 31a to the outer edge of the first light-emitting device Pa is the first distance h1, and the minimum distance from the inner side of the second light adjustment unit 31b to the outer edge of the second light-emitting device Pb is the second distance h2, and the first distance h1 is greater than the second distance h2. The first light-emitting device Pa and the second light-emitting device Pb are basically at the same plane height, and the first light adjustment unit 31a and the second light adjustment unit 31b are also basically at the same plane height. As shown schematically in the cross-sectional view, the horizontal distance h1 from the inner side of the first light adjustment unit 31a to the outer edge of the first light-emitting device Pa, the horizontal distance h2 from the inner side of the second light adjustment unit 31b to the outer edge of the second light-emitting device Pb, the light rays emitted from the edge of the first light-emitting device Pa with an exit angle greater than α1 can be adjusted by the first light adjustment unit to change the light path, and the light rays emitted from the edge of the second light-emitting device Pb with an exit angle greater than α2 can be adjusted by the second light adjustment unit to change the light path. Since h1>h2, α1>α2. Compared with the first light adjustment unit 31a, the second light adjustment unit 31b can adjust the light paths of more light rays emitted by the second light-emitting device Pb. That is, after the light path is changed at the interface between the second light adjustment unit 31b and the dielectric layer, more light rays emitted by the second light-emitting device Pb converge towards the direction closer to the second light-emitting device PB, so the increase in the light extraction efficiency of the second light-emitting device is greater than the increase in the light extraction efficiency of the first light-emitting device.

[0068] This embodiment can be applied to a display panel with a side curved surface, such asFigure 14 There is schematically shown a display panel with a side curved surface (at position Q in the figure). Only a simplified schematic is shown, and the specific structure is not shown. Since the side of the display panel is bent, the light emitted during the light-emitting period at the bent part will be offset relative to the front view direction f of the display panel, where the front view direction f is understood as the direction in which the user's eyes look at the display panel in the usage state. When the user views the side curved surface (position Q) in the front view direction f, there will be a color shift phenomenon, which affects the display effect. This is because the attenuation degrees of the light emitted by different color light-emitting devices in the side curved surface display area are different. Through Figure 13 the solution of the embodiment, in the side curved surface display area, different designs are made for the light adjustment units corresponding to different color light-emitting devices. By adjusting the different increases in the light output efficiency of different color light-emitting devices, the difference in the attenuation degrees of the light emitted by different color light-emitting devices is balanced, thereby improving the side curved surface color shift problem and enhancing the display effect.

[0069] Specifically, in the side curved surface display area: the minimum distance from the inner side of the light adjustment unit corresponding to the blue light-emitting device to the outer edge of the blue light-emitting device is h3, the minimum distance from the inner side of the light adjustment unit corresponding to the green light-emitting device to the outer edge of the green light-emitting device is h4, and the minimum distance from the inner side of the light adjustment unit corresponding to the red light-emitting device to the outer edge of the red light-emitting device is h5. In one embodiment, h3 > h4 > h5. In another embodiment, h3 > h4 = h5.

[0070] In one embodiment, the first light-emitting device and the second light-emitting device have different emission colors, and the emission area of the first light-emitting device is larger than that of the second light-emitting device; the area of the through hole overlapping with the first light-emitting device is the first area, and the area of the through hole overlapping with the second light-emitting device is the second area; wherein, the first area is larger than the second area. According to the different emission areas, the areas of the through holes overlapping with the light-emitting devices are designed. The larger the emission area of the light-emitting device, the larger the area of the through hole overlapping with the light-emitting device. Thus, the size of the through hole of the light adjustment unit is designed according to the emission area of the light-emitting device, ensuring that the light adjustment structure layer only adjusts the optical path of the light emitted by the light-emitting device at a larger angle, without changing the optical path of the light emitted by the light-emitting device at a smaller angle, and avoiding adverse effects caused by adjusting the optical path of the light at a smaller angle.

[0071] Specifically, in one embodiment, as Figure 15 shown Figure 15Another top view schematic diagram of the display panel provided by the embodiment of the present invention. The plurality of light-emitting devices include red light-emitting devices, green light-emitting devices, and blue light-emitting devices. Among them, the light-emitting area of the blue light-emitting device PB > the light-emitting area of the green light-emitting device PG > the light-emitting area of the red light-emitting device PR. The through hole KB overlaps with the blue light-emitting device PB, the through hole KG overlaps with the green light-emitting device PG, and the through hole KR overlaps with the red light-emitting device PR. Among them, the area of the through hole KB > the area of the through hole KG > the area of the through hole KR. The areas of the through holes corresponding to the light-emitting devices of different colors are designed to be different, ensuring that the large-angle light emitted by each light-emitting device of different colors can change the light path after the action of the light adjustment structure layer, thereby improving the light extraction efficiency of each light-emitting device of different colors.

[0072] In another embodiment, the light-emitting area of the green light-emitting device is the same as that of the red light-emitting device, and both are smaller than the light-emitting area of the blue light-emitting device. The area of the through hole overlapping with the blue light-emitting device is larger than the area of the through hole overlapping with the green light-emitting device, the area of the through hole overlapping with the blue light-emitting device is larger than the area of the through hole overlapping with the red light-emitting device, and the area of the through hole overlapping with the red light-emitting device is equal to the area of the through hole overlapping with the green light-emitting device. No further schematic diagram is shown here.

[0073] In some alternative embodiments, Figure 16 Another cross-sectional schematic diagram of the display panel provided by the embodiment of the present invention. As Figure 16 shown, the display panel further includes a contact layer 106. The contact layer 106 is located between the light-emitting device layer 102 and the light adjustment structure layer 103. Among them, the surface of the contact layer 106 on the side away from the substrate 101 includes a plurality of central regions X and a peripheral region Z surrounding the central regions X. The light adjustment unit 31 is in contact with the peripheral region Z. The through hole K exposes the central region X, that is, the shape of the central region X is substantially the same as the shape of the through hole K, and the shape of the peripheral region Z is substantially the same as the shape of the light adjustment unit 31.

[0074] Specifically, in one embodiment, the surface energy of the central region X is less than that of the peripheral region Z. In this embodiment, the light regulating units in the light regulating structure layer can be fabricated by an inkjet printing process. During fabrication, first, the surface of the contact layer away from the substrate is pre-treated to form a plurality of central regions and a plurality of peripheral regions, where the surface energy of the central region is less than that of the peripheral region. Then, ink droplets are jetted at positions corresponding to the light-emitting devices by the inkjet printing process. The ink droplets cover the central region and at least part of the peripheral region. Since the surface energy of the central region is less than that of the peripheral region, the central region is not easily wetted by the ink droplets, while the peripheral region is more easily wetted by the ink droplets compared to the central region. During the evaporation of the solvent in the ink droplets, the ink in the central region is more likely to aggregate towards the peripheral region. After the solvent has evaporated, a light regulating unit with a through-hole is formed, and the through-hole exposes the central region. The differential design of the surface energy of the central region and the peripheral region in the contact layer can play an auxiliary role in the fabrication process of the light regulating unit, ensuring in one step that a light regulating unit with a through-hole can be fabricated using the inkjet printing process. Moreover, the size of the difference in surface energy between the central region and the peripheral region can be adjusted by adjusting the pre-treatment process parameters, thereby enabling control over the size of the through-hole area in the light regulating unit.

[0075] Specifically, in another embodiment, the roughness of the central region X is less than that of the peripheral region Z. In this embodiment, the light regulating units in the light regulating structure layer can be fabricated by an inkjet printing process. During fabrication, first, the surface of the contact layer away from the substrate is pre-treated to form a plurality of central regions and a plurality of peripheral regions, where the roughness of the central region is less than that of the peripheral region. Then, ink droplets are jetted at positions corresponding to the light-emitting devices by the inkjet printing process. The ink droplets cover the central region and at least part of the peripheral region. Since the roughness of the central region is less than that of the peripheral region, that is, the surface of the central region is smoother than that of the peripheral region, the central region is not easily wetted by the ink droplets, while the peripheral region is more easily wetted by the ink droplets. During the evaporation of the solvent in the ink droplets, the ink in the central region is more likely to aggregate towards the peripheral region. After the solvent has evaporated, a light regulating unit with a through-hole is formed, and the through-hole exposes the central region. The differential design of the roughness of the central region and the peripheral region in the contact layer can play an auxiliary role in the fabrication process of the light regulating unit, ensuring in one step that a light regulating unit with a through-hole can be fabricated using the inkjet printing process. Moreover, the size of the difference in roughness between the central region and the peripheral region can be adjusted by adjusting the pre-treatment process parameters, thereby enabling control over the size of the through-hole area in the light regulating unit. Optionally, the contact layer is a nanocrystalline layer, wherein the density of the nanoparticles in the nanocrystalline layer of the central region is greater than that of the peripheral region.

[0076] Further, Figure 17 Another cross-sectional schematic diagram of the display panel provided by the embodiment of the present invention. As Figure 17As shown, a first light-emitting device Pa and a second light-emitting device Pb with different emission colors are shown. The light-emitting area of the first light-emitting device Pa is larger than that of the second light-emitting device Pb. The plurality of central regions include a first central region X1 and a second central region X2. In the direction e perpendicular to the substrate 101, the first central region X1 overlaps with the first light-emitting device Pa, and the second central region X2 overlaps with the second light-emitting device Pb.

[0077] In one embodiment, the surface energy of the first central region X1 is smaller than that of the second central region X2. The smaller the surface energy, the less likely it is to be wetted by ink droplets when fabricating the light adjustment unit using the inkjet printing process. Then, during the evaporation process of the ink solvent during fabrication, the ink above the first central region is more likely to gather towards the peripheral region compared to the ink above the second central region. That is to say, the degree of the ink above the first central region gathering towards the peripheral region is greater. Correspondingly, after the solvent evaporation is completed, the area of the through hole formed above the first central region is larger. By setting different surface energies for the central regions corresponding to light-emitting devices with different emission colors, it is possible to combine the inkjet printing process to fabricate a light adjustment unit with through holes of different sizes above light-emitting devices with different emission colors, thereby realizing the design of the size of the through holes of the light adjustment unit according to the light-emitting area of the light-emitting device. Designing the surface energies of the central regions corresponding to light-emitting devices with different emission colors differently can play an auxiliary role in fabricating the light adjustment unit, and the fabrication process is simple.

[0078] Specifically, in one embodiment, the light-emitting area of the blue light-emitting device is larger than that of the green light-emitting device, and the light-emitting area of the green light-emitting device is larger than that of the red light-emitting device. The surface energy of the central region overlapping with the blue light-emitting device is smaller than the surface energy of the central region overlapping with the green light-emitting device, and the surface energy of the central region overlapping with the green light-emitting device is smaller than the surface energy of the central region overlapping with the red light-emitting device.

[0079] In another embodiment, the light-emitting area of the green light-emitting device is the same as that of the red light-emitting device, and both are smaller than the light-emitting area of the blue light-emitting device. The surface energy of the central region overlapping with the blue light-emitting device is smaller than the surface energy of the central region overlapping with the green light-emitting device, and the surface energy of the central region overlapping with the green light-emitting device is equal to the surface energy of the central region overlapping with the red light-emitting device.

[0080] In another embodiment, the roughness of the first central region X1 is smaller than that of the second central region X2. The smaller the roughness, the less likely it is to be wetted by ink droplets when fabricating the light adjustment unit using the inkjet printing process. During the evaporation process of the ink solvent during fabrication, the ink above the first central region is more likely to gather towards the peripheral region compared to the ink above the second central region. That is to say, the degree of the ink above the first central region gathering towards the peripheral region is greater. Correspondingly, after the solvent evaporation is completed, the area of the through hole formed above the first central region is larger. By setting the surface energy of the central regions corresponding to light-emitting devices with different emission colors to be different, it is possible to combine with the inkjet printing process to fabricate light adjustment units with through holes of different sizes above light-emitting devices with different emission colors, thereby realizing the design of the size of the through holes of the light adjustment unit according to the light-emitting area of the light-emitting device. Differentially designing the roughness of the central regions corresponding to light-emitting devices with different emission colors can play an auxiliary role in fabricating the light adjustment unit, and the fabrication process is simple.

[0081] Specifically, in one embodiment, the light-emitting area of the blue light-emitting device is larger than that of the green light-emitting device, and the light-emitting area of the green light-emitting device is larger than that of the red light-emitting device; the roughness of the central region overlapping with the blue light-emitting device is smaller than the roughness of the central region overlapping with the green light-emitting device, and the roughness of the central region overlapping with the green light-emitting device is smaller than the roughness of the central region overlapping with the red light-emitting device.

[0082] In another embodiment, the light-emitting areas of the green light-emitting device and the red light-emitting device are the same and are both smaller than the light-emitting area of the blue light-emitting device; the roughness of the central region overlapping with the blue light-emitting device is smaller than the roughness of the central region overlapping with the green light-emitting device, and the roughness of the central region overlapping with the green light-emitting device is equal to the roughness of the central region overlapping with the red light-emitting device.

[0083] In one embodiment, Figure 18 This is another cross-sectional schematic diagram of the display panel provided by the embodiment of the present invention. Figure 19 is Figure 18 a schematic diagram of the principle corresponding to the embodiment. As Figure 18 shown, the first light-emitting device Pa and the second light-emitting device Pb with different emission colors are shown. The light-emitting area of the first light-emitting device Pa is larger than that of the second light-emitting device Pb. The refractive index of the light adjustment unit 31a corresponding to the first light-emitting device Pa is n1, and the refractive index of the light adjustment unit 31b corresponding to the second light-emitting device Pb is n2, where n1 < n2.

[0084] As Figure 19Simplified schematic diagram showing a light-emitting device P, the interface M between the light adjustment unit and the dielectric layer, and the refractive index of the dielectric layer is fixed. The incident angle of the light ray S7 on the interface M is θ5. According to the refraction law, when the refractive index of the light adjustment unit is n1, the refracted ray of the light ray S7 is S8′, and the refraction angle is θ6; when the refractive index of the light adjustment unit is n2, the refracted ray of the light ray S7 is S8″, and the refraction angle is θ7; since n1 < n2, then θ6 < θ7. It can also be seen from the figure that the angle between the propagation direction of the light ray S8′ and the direction e is smaller than the angle between the propagation direction of the light ray S8″ and the direction e. It can be seen that the smaller the refractive index of the light adjustment unit, the smaller the angle between the refracted ray emitted after the interface between it and the dielectric layer and the direction e. That is to say, the smaller the refractive index of the light adjustment unit, the better its ability to adjust the optical path of the large-angle light emitted by the light-emitting device. In the embodiment of the present invention, n1 < n2, so the ability of the light adjustment unit 31a to adjust the optical path of the large-angle light is better than that of the light adjustment unit 31b, so that the increase in the light extraction efficiency of the first light-emitting device Pa can be greater than the increase in the light extraction efficiency of the second light-emitting device Pb, and further, the difference in the light-emitting efficiency between different color light-emitting devices can be balanced by adjusting the increase in the light extraction efficiency of different color light-emitting devices.

[0085] Specifically, in one embodiment, the light-emitting area of the blue light-emitting device is larger than that of the green light-emitting device, and the light-emitting area of the green light-emitting device is larger than that of the red light-emitting device; the refractive index of the light adjustment unit corresponding to the blue light-emitting device is smaller than the refractive index of the light adjustment unit corresponding to the green light-emitting device, and the refractive index of the light adjustment unit corresponding to the green light-emitting device is smaller than the refractive index of the light adjustment unit corresponding to the red light-emitting device.

[0086] In another embodiment, the light-emitting areas of the green light-emitting device and the red light-emitting device are the same and both are smaller than the light-emitting area of the blue light-emitting device; the refractive index of the light adjustment unit corresponding to the blue light-emitting device is smaller than the refractive index of the light adjustment unit corresponding to the green light-emitting device, and the refractive index of the light adjustment unit corresponding to the green light-emitting device is equal to the refractive index of the light adjustment unit corresponding to the red light-emitting device.

[0087] In another embodiment, the refractive index of the light adjustment unit corresponding to the blue light-emitting device is smaller than the refractive index of the light adjustment unit corresponding to the green light-emitting device, and the refractive index of the light adjustment unit corresponding to the green light-emitting device is smaller than the refractive index of the light adjustment unit corresponding to the red light-emitting device. By adjusting the increase in the light extraction efficiency of different color light-emitting devices to balance the difference in the light-emitting efficiency between different color light-emitting devices, further set the light-emitting areas of the blue light-emitting device, the red light-emitting device, and the green light-emitting device to be the same in this embodiment. During manufacturing, different color light-emitting devices can be fabricated using the same mask plate, which can simplify the manufacturing process.

[0088] Further, in some embodiments, after adjusting the refractive index of the light regulating unit corresponding to the blue light-emitting device to improve the light extraction efficiency of the blue light-emitting device, the emission brightness of the blue light-emitting device can be correspondingly lowered, so as to improve the service life of the blue light-emitting device.

[0089] It should be noted that the embodiments of the present invention do not make any limitation on the arrangement manner of the light-emitting devices in the display panel. The arrangement of the light-emitting devices in the top view involved in the above partial embodiments is only a schematic representation.

[0090] Based on the same inventive concept, the embodiments of the present invention further provide a display device, Figure 20 which is a schematic diagram of the display device provided by the embodiments of the present invention. As Figure 20 shown, the display device includes the display panel 10 provided by any embodiment of the present invention. Figure 20 The display device shown is only for schematic illustration. The display device may be any electronic device with a display function, such as an in-vehicle display device, a mobile phone, a tablet computer, a laptop computer, an e-book, or a television, a wearable mobile phone or a watch, etc.

[0091] Based on the same inventive concept, the embodiments of the present invention further provide a manufacturing method of a display panel for manufacturing the display panel provided by the embodiments of the present invention. Figure 21 which is a flowchart of the manufacturing method of the display panel provided by the embodiments of the present invention. Figure 1 , Figure 22 which is a flowchart of the manufacturing method of the display panel provided by the embodiments of the present invention. Figure 2 . As Figure 21 shown, the manufacturing method includes:

[0092] Step S101: Provide a substrate 101;

[0093] Step S102: Fabricate a light-emitting device layer 102 on the substrate 101. The light-emitting device layer 102 includes a plurality of light-emitting devices P (only two are schematically shown in the figure). Among them, the light-emitting device P may be an organic light-emitting device or a micro diode, and only a simplified schematic is shown in the figure.

[0094] Fabricate a light regulating structure layer 103 on the side of the light-emitting device layer 102 away from the substrate 101, specifically including:

[0095] Step S103: Fabricate a plurality of light regulating unit precursors T by an inkjet printing process;

[0096] Step S104: Evaporate the solvent to obtain a plurality of light adjustment units 31. Each light adjustment unit 31 includes a dimming part F. Each light adjustment unit 31 includes a through hole K. The through hole K penetrates the light adjustment unit 31 in the direction e perpendicular to the substrate. The through hole K overlaps with the light-emitting device P. The dimming part F is arranged around the through hole K. For one light adjustment unit 31, in the direction from the through hole K to the dimming part F, the thickness of the dimming part F gradually increases.

[0097] As Figure 22 shown, Figure 22 Fig. shows a top view schematic diagram from step S103 to step S104 during the manufacturing process, only showing a partial area. The inkjet printing process is used to manufacture the light adjustment unit 31. Ink droplets (i.e., manufacturing the light adjustment unit precursor T) are sprayed at the corresponding position of each light adjustment unit 31. The evaporation rate of the solvent at the edge of the ink droplets is much greater than the loss rate of its liquid volume. Therefore, the solvent replenishes from the central area to the edge, thereby forming a capillary flow from the inside to the outside, causing the solute in the ink to accumulate at the edge. After the solvent evaporates, the light adjustment unit 31 with the through hole K is formed. Among them, the solute of the ink is the manufacturing material of the light adjustment unit.

[0098] Optionally, during manufacturing, the composition of the ink used for inkjet printing can also be adjusted to reduce the surface tension of the ink. Thus, during the solvent evaporation process, the solvent in the adjustment unit precursor T is more likely to replenish from the central area to the edge, causing the solute to concentrate at the edge.

[0099] Step S105: Manufacture a dielectric layer 32 on the plurality of light adjustment units 31. Among them, the refractive index of the light adjustment unit is less than the refractive index of the dielectric layer 32. The dielectric layer 32 and the plurality of light adjustment units 31 together constitute the light adjustment structure layer 103.

[0100] The manufacturing method provided by this embodiment first uses the inkjet printing process to manufacture the light adjustment unit precursor. During the evaporation process of the solvent in the ink, the ink in the central area of the light adjustment unit precursor replenishes to the edge. Thus, the solute in the ink accumulates at the edge of the adjustment unit precursor. After the solvent evaporates, a light adjustment unit with a through hole is formed. Then, a dielectric layer is manufactured on the light adjustment unit, and finally, a light adjustment structure layer composed of the dielectric layer and a plurality of light adjustment units is formed. Among them, the refractive index of the light adjustment unit is less than the refractive index of the dielectric layer, and the manufacturing process of the light adjustment structure layer is simple. In addition, for the display panel manufactured by this embodiment, the light adjustment structure layer is manufactured on the light-emitting device layer, which can adjust the optical path of the large-angle light emitted by the light-emitting device, reduce the angle between this part of the light and the direction perpendicular to the display panel, thereby reducing the probability of total reflection of this part of the light at the film interface in the display panel or at the interface between the display panel and the air, improving the light extraction efficiency of the light-emitting device, and thus reducing the power consumption of the display panel.

[0101] In one embodiment, Figure 23 is the process flow of the manufacturing method of the display panel provided by the embodiment of the present invention Figure 3 , as Figure 23 shown, the manufacturing method includes:

[0102] Step S201: Provide a substrate.

[0103] Step S202: Fabricate a light-emitting device layer on the substrate, and the light-emitting device layer includes a plurality of light-emitting devices.

[0104] Step S203: Form a pre-contact layer on the light-emitting device layer.

[0105] Step S204: Pretreat the surface of the pre-contact layer on the side away from the substrate to form a contact layer. The contact layer includes a plurality of central regions and a peripheral region surrounding the central regions. In the direction perpendicular to the substrate, the central regions overlap with the light-emitting devices. The central regions and the peripheral region formed after pretreatment have different characteristics. Optionally, the surface energy of the central regions is less than that of the peripheral region; or the roughness of the central regions is less than that of the peripheral region.

[0106] Step S205: Fabricate a plurality of light modulation unit precursors on the pre-contact layer by an inkjet printing process;

[0107] Step S206: Evaporate the solvent to obtain a plurality of light modulation units. Each light modulation unit includes a dimming part. Each light modulation unit includes a through hole. The through hole penetrates the light modulation unit in the direction perpendicular to the substrate, and the through hole overlaps with the light-emitting device. The dimming part is arranged around the through hole. For one light modulation unit, in the direction pointing from the through hole to the dimming part, the thickness of the dimming part gradually increases.

[0108] Step S207: Fabricate a dielectric layer on the plurality of light modulation units. The refractive index of the light modulation unit is less than that of the dielectric layer.

[0109] The display panel fabricated by this embodiment can refer to the schematic diagrams of the above Figure 15 and Figure 16 . In this embodiment, before fabricating the light modulation structure layer, a pre-contact layer is first fabricated, and the surface of the pre-contact layer on the side away from the substrate is pretreated to form a contact layer. Correspondingly, central regions and a peripheral region with different characteristics are formed in the contact layer. The characteristic difference between the central regions and the peripheral region can play an auxiliary role in the process of forming the light modulation units.

[0110] Further, in step S205, an inkjet printing process is used to fabricate a plurality of light adjustment unit precursors, including: the light adjustment unit precursors cover the central region and at least a part of the peripheral region. This embodiment can ensure that the through holes of the light adjustment units formed after the solvent evaporation in the light adjustment unit precursors overlap with the light-emitting devices, and in the direction perpendicular to the substrate, the light adjustment units do not overlap with the light-emitting devices, ensuring that the light adjustment structure layer only adjusts the optical path of the light emitted by the light-emitting devices at a larger angle, without changing the optical path of the light emitted by the light-emitting devices at a smaller angle, and avoiding adverse effects caused by adjusting the optical path of the light at a smaller angle.

[0111] In one embodiment, the surface energy of the central region is less than that of the peripheral region. After using the inkjet printing process to fabricate the light adjustment unit precursors, the central region is not easily wetted by the ink droplets, while the peripheral region is more easily wetted by the ink droplets compared with the central region; during the solvent evaporation process in the light adjustment unit precursors, the ink in the central region is more likely to aggregate towards the peripheral region, and after the solvent evaporation, a light adjustment unit with through holes is formed. Forming a central region and a peripheral region with different surface energies after pretreatment can play an auxiliary role in the fabrication process of the light adjustment unit. And the size of the surface energy difference between the central region and the peripheral region can be adjusted by adjusting the pretreatment process parameters, so that the size of the through hole area in the light adjustment unit can be controlled. In the display panel, the plurality of light-emitting devices include red light-emitting devices, green light-emitting devices, and blue light-emitting devices. By adopting this embodiment, through holes overlapping with light-emitting devices of different colors can be fabricated with different areas according to the design requirements.

[0112] Specifically, step S204 pre-treats the surface of the pre-contact layer on the side away from the substrate to form a contact layer, including any one of the following:

[0113] The surface of the pre-contact layer is pre-treated by a plasma treatment process to form a plurality of central regions and peripheral regions; among them, the plasma treatment process can increase the surface energy of the film layer, divide the surface of the pre-contact layer into a first pre-treatment region and a second pre-treatment region, and in the direction perpendicular to the substrate, the first pre-treatment region overlaps with the light-emitting device, and the second pre-treatment region surrounds the first pre-treatment region. Only the second pre-treatment region is pre-treated by the plasma treatment process to increase the surface energy to form the peripheral region, and the first pre-treatment region is not pre-treated to form the central region.

[0114] The surface of the pre-contact layer is pretreated by a UV process to form a plurality of central regions and peripheral regions. Among them, the UV process can increase the surface energy of the film layer surface, divide the surface of the pre-contact layer into a first pretreatment region and a second pretreatment region. In the direction perpendicular to the substrate, the first pretreatment region overlaps with the light-emitting device, and the second pretreatment region surrounds the first pretreatment region. The UV process is used to only pretreat the second pretreatment region to increase the surface energy to form the peripheral region, and the first pretreatment region is not pretreated to form the central region.

[0115] The surface of the pre-contact layer is pretreated by a hydrophilic or hydrophobic process to form a plurality of central regions and peripheral regions. Among them, the surface of the pre-contact layer is divided into a first pretreatment region and a second pretreatment region. In the direction perpendicular to the substrate, the first pretreatment region overlaps with the light-emitting device, and the second pretreatment region surrounds the first pretreatment region. Optionally, the first pretreatment region is pretreated by a hydrophobic process to form the central region, and the second pretreatment region is not pretreated to form the peripheral region; optionally, the second pretreatment region is pretreated by a hydrophilic process to form the peripheral region, and the first pretreatment region is not pretreated to form the central region; optionally, the first pretreatment region is pretreated by a hydrophobic process to form the central region, and at the same time the second pretreatment region is pretreated by a hydrophilic process to form the peripheral region.

[0116] In another embodiment, the roughness of the central region is less than that of the peripheral region. After the light modulation unit precursor is fabricated by an inkjet printing process, the central region is not easily wetted by the ink droplets, while the peripheral region is more easily wetted by the ink droplets compared with the central region. During the evaporation of the solvent in the light modulation unit precursor, the ink in the central region is more likely to aggregate towards the peripheral region, and a light modulation unit with through holes is formed after the solvent evaporates. Forming a central region and a peripheral region with different roughnesses after pretreatment can play an auxiliary role in the fabrication process of the light modulation unit, and the size of the roughness difference between the central region and the peripheral region can be adjusted by adjusting the pretreatment process parameters, so that the size of the through hole area in the light modulation unit can be controlled. Among the multiple light-emitting devices in the display panel, there are red light-emitting devices, green light-emitting devices and blue light-emitting devices. By adopting this implementation manner, through holes overlapping with light-emitting devices of different colors can be fabricated with different areas according to design requirements.

[0117] Specifically, step S204 pre-treats the surface of the pre-contact layer on the side away from the substrate to form a contact layer, including: fabricating a nanocrystalline layer on the pre-contact layer to form a plurality of central regions and peripheral regions. Among them, the greater the density of the nanoparticles in the nanocrystalline layer, the smaller the surface roughness. The surface of the pre-contact layer is divided into a first pre-treatment region and a second pre-treatment region. In the direction perpendicular to the substrate, the first pre-treatment region overlaps with the light-emitting device, and the second pre-treatment region surrounds the first pre-treatment region. A nanocrystalline layer with a relatively high density is fabricated in the first pre-treatment region to form a central region, and a nanocrystalline layer with a relatively low density is fabricated in the second pre-treatment region to form a peripheral region.

[0118] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

[0119] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A display panel, characterized in that, comprising: a substrate; a light-emitting device layer located above the substrate, the light-emitting device layer including a plurality of light-emitting devices; a light adjustment structure layer located on a side of the light-emitting device layer away from the substrate, including a light adjustment unit and a dielectric layer covering the light adjustment unit, the light adjustment unit including a through hole that overlaps with the light-emitting device; the light adjustment unit includes a light adjustment section disposed around the through hole; the plurality of light-emitting devices include a first light-emitting device and a second light-emitting device having different emission colors, and the emission area of the first light-emitting device is larger than the emission area of the second light-emitting device; the through hole includes a first through hole and a second through hole, the first light-emitting device overlaps with the first through hole, and the second light-emitting device overlaps with the second through hole; the light adjustment section around the first through hole is a first light adjustment section, and the light adjustment section around the second through hole is a second light adjustment section; in a direction from the first through hole to the first light adjustment section, a thickness change rate of the first light adjustment section is γ1, and in a direction from the second through hole to the second light adjustment section, a thickness change rate of the second light adjustment section is γ2, and γ2 > γ1; the thickness change rate represents a ratio of a thickness change amount of the light adjustment section to a length change amount of the light adjustment section, where the length change amount of the light adjustment section represents a length change amount of the light adjustment section in a direction from the through hole to the light adjustment section, and the thickness change amount of the light adjustment section represents a thickness change amount of the light adjustment section in a direction perpendicular to the substrate; 2. The display panel according to claim 1, characterized in that, an emission angle range of light emitted from an edge of the first light-emitting device that can have its optical path changed by the first light adjustment section is larger than an emission angle range of light emitted from an edge of the second light-emitting device that can have its optical path changed by the second light adjustment section.

3. The display panel according to claim 1, characterized in that, the first light-emitting device is a blue light-emitting device, and the second light-emitting device is a red light-emitting device; or, the first light-emitting device is a blue light-emitting device, and the second light-emitting device is a green light-emitting device; or, the first light-emitting device is a green light-emitting device, and the second light-emitting device is a red light-emitting device.

4. The display panel according to claim 1, characterized in that, a refractive index of the light adjustment unit is less than a refractive index of the dielectric layer.

5. The display panel according to claim 1, characterized in that, an interface between the light adjustment section and the dielectric layer is an arc surface.

6. The display panel according to claim 1 or 5, characterized in that, a positive projection of the light adjustment unit on the substrate is annular, the light adjustment unit includes a first surface on a side away from the substrate, and the first surface protrudes toward a side away from the substrate.

7. The display panel according to claim 1, characterized in that, the display panel further includes a packaging layer and a touch film group layer; The encapsulation layer and the touch film group layer are both located between the light-emitting device layer and the light adjustment structure layer, where; The encapsulation layer is located on the side of the touch film group layer close to the light-emitting device layer, and the encapsulation layer includes at least one organic encapsulation layer and at least one inorganic encapsulation layer.

8. The display panel according to claim 1, characterized in that, Two adjacent light adjustment units are independent of each other.

9. The display panel according to claim 1, characterized in that, Two adjacent light adjustment units are in contact with each other in part.

10. The display panel according to claim 1, characterized in that, The dielectric layer is a planarization layer.

11. A display device, characterized in that, It includes the display panel according to any one of claims 1 to 10.

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