Display panel, manufacturing method thereof and display device

Abstract

The present disclosure provides a display panel and a manufacturing method thereof, and a display device, and belongs to the technical field of display. The display panel has a plurality of sub-pixels, including a driving backplane; a light emitting device layer is arranged on one side of the driving backplane, the light emitting device layer includes a pixel definition layer and a plurality of light emitting devices defined by the pixel definition layer, and the plurality of light emitting devices include a plurality of first light emitting devices and a plurality of second light emitting devices; wherein the first light emitting devices and the second light emitting devices correspond to form sub-pixels of different colors; the first light emitting devices and the second light emitting devices each include a first electrode, a light emitting functional layer and a second electrode which are arranged in a stacked manner away from the driving backplane; the light emitting functional layer includes a printing material layer and an evaporation material layer which are arranged in a stacked manner away from the driving backplane; and the thickness of the printing material layer of the first light emitting device is greater than the thickness of the printing material layer of the second light emitting device. The present disclosure helps to improve the color gamut and reduce power consumption.

Description

Technical Field

[0001] This disclosure relates to the field of display technology, and in particular to a display panel, a method for manufacturing the same, and a display device. Background Technology

[0002] The basic structure of an Organic Light-Emitting Diode (OLED) includes an anode layer, a functional layer, and a cathode layer. The functional layer comprises a hole transport layer, an emissive layer, and an electron transport layer. When an appropriate voltage is applied to the cathode and anode, electrons and holes are injected from the cathode and anode into the electron and hole transport layers, respectively. They then migrate through the electron and hole transport layers to the emissive layer, where they recombine to emit light, thus enabling the OLED device to emit its own light.

[0003] Current technology uses white organic light emission display devices (WOLEDs) to display color by using RGB three-color films to emit white light, but its color gamut and other properties still need further improvement.

[0004] The information disclosed in the background section is only for enhancing the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0005] The purpose of this disclosure is to provide a display panel and its manufacturing method, as well as a display device, to improve color gamut and reduce power consumption.

[0006] To achieve the above-mentioned objectives, the present disclosure adopts the following technical solution:

[0007] According to a first aspect of this disclosure, a display panel is provided having a plurality of sub-pixels, including:

[0008] Drive backplane;

[0009] A light-emitting device layer is disposed on one side of the driving backplate. The light-emitting device layer includes a pixel definition layer and a plurality of light-emitting devices defined by the pixel definition layer. The plurality of light-emitting devices includes a plurality of first light-emitting devices and a plurality of second light-emitting devices.

[0010] The first light-emitting device and the second light-emitting device form sub-pixels of different colors respectively;

[0011] Both the first light-emitting device and the second light-emitting device include a first electrode, a light-emitting functional layer, and a second electrode stacked along the direction away from the driving backplate;

[0012] The light-emitting functional layer includes a printing material layer and a vapor-deposited material layer stacked along the direction away from the driving backplate;

[0013] The thickness of the printing material layer of the first light-emitting device is greater than the thickness of the printing material layer of the second light-emitting device.

[0014] In one exemplary embodiment of this disclosure, the display panel has a plurality of sub-pixels, the plurality of sub-pixels including a plurality of red sub-pixels, a plurality of blue sub-pixels, a plurality of green sub-pixels and a plurality of white sub-pixels;

[0015] The first light-emitting device forms the blue sub-pixel or the red sub-pixel, and the second light-emitting device forms the green sub-pixel or the white sub-pixel.

[0016] In one exemplary embodiment of this disclosure, the display panel further includes:

[0017] A color filter layer is disposed on the side of the light-emitting device layer away from the driving backplate. The color filter layer includes a light-shielding part and a plurality of light-filtering parts separated by the light-shielding part. The light-filtering parts are arranged one-to-one with the light-emitting devices in a direction perpendicular to the driving backplate. The light-filtering parts include a red light-filtering part, a blue light-filtering part, a green light-filtering part, and a white light-transmitting part.

[0018] Wherein, both the first light-emitting device and the second light-emitting device are white light devices, the first light-emitting device is disposed corresponding to the blue filter or the red filter, and the second light-emitting device is disposed corresponding to the green filter or the white light-transmitting part.

[0019] In one exemplary embodiment of this disclosure, the first light-emitting device includes a first sub-light-emitting device and a second sub-light-emitting device, wherein the first sub-light-emitting device forms the blue sub-pixel and the second sub-light-emitting device forms the red sub-pixel.

[0020] The second light-emitting device includes a third sub-light-emitting device and a fourth sub-light-emitting device, wherein the third sub-light-emitting device forms a green sub-pixel and the fourth sub-light-emitting device forms a white sub-pixel.

[0021] The printing material layers of multiple first sub-light-emitting devices are connected as a whole, the printing material layers of multiple second sub-light-emitting devices are connected as a whole, and the printing material layers of the first sub-light-emitting devices and the printing material layers of the second sub-light-emitting devices are connected as a whole.

[0022] The printing material layers of the plurality of third sub-light-emitting devices are connected as a whole, the printing material layers of the plurality of fourth sub-light-emitting devices are connected as a whole, and the printing material layers of the third sub-light-emitting devices and the printing material layers of the fourth sub-light-emitting devices are connected as a whole.

[0023] In an exemplary embodiment of this disclosure, the pixel definition layer includes a plurality of first defining dams extending along a first direction and spaced apart along a second direction, and a plurality of second defining dams extending along the second direction and spaced apart along the first direction, wherein the first direction and the second direction intersect, and the plurality of first defining dams and the plurality of second defining dams mutually intersect to define the range of each light-emitting device;

[0024] The second limiting dam includes a first sub-limiting dam and a second sub-limiting dam arranged alternately along the first direction;

[0025] The first sub-limiting dam is located between the first sub-light-emitting device and the second sub-light-emitting device, or the first sub-limiting dam is located between the third sub-light-emitting device and the fourth sub-light-emitting device;

[0026] The second sub-limiting dam is located between the first light-emitting device and the second light-emitting device;

[0027] The height of the first sub-dam is less than the height of the second sub-dam, and the first sub-dam comprises a hydrophilic material, while the second sub-dam comprises a hydrophobic material.

[0028] In one exemplary embodiment of this disclosure, the height of the first defined dam is 0.3-1 μm;

[0029] The height of the first sub-dam is 0.3-1 μm, and the height of the second sub-dam is 1-1.5 μm.

[0030] In one exemplary embodiment of this disclosure, the printing material layer is used to regulate the injection or transport of holes.

[0031] In one exemplary embodiment of this disclosure, the vapor-deposited material layer includes a phosphorescent luminescent layer and a fluorescent luminescent layer, wherein the luminescent color of the phosphorescent luminescent layer is different from the luminescent color of the fluorescent luminescent layer.

[0032] In one exemplary embodiment of this disclosure, the printing material layer includes a hole injection layer;

[0033] The vapor-deposited material layer includes a first hole transport layer, a first light-emitting layer, a first electron transport layer, a first charge generation layer, a second hole transport layer, a second light-emitting layer, a second electron transport layer, a second charge generation layer, a third hole transport layer, a third light-emitting layer, and a third electron transport layer, stacked in a direction away from the driving backplate.

[0034] The first light-emitting layer is a blue fluorescent light-emitting layer, the second light-emitting layer is a yellow phosphorescent light-emitting layer, and the third light-emitting layer is a blue fluorescent light-emitting layer.

[0035] In one exemplary embodiment of this disclosure, the yellow phosphorescent layer includes a green phosphorescent layer and a red phosphorescent layer.

[0036] In one exemplary embodiment of this disclosure, the thickness of the printing material layer of the first light-emitting device is 90-110 nm thicker than the thickness of the printing material layer of the second light-emitting device.

[0037] In one exemplary embodiment of this disclosure, the driving backplane includes a substrate and a driving circuit layer disposed on one side of the substrate, the driving circuit layer including a planarization layer;

[0038] The planarization layer has multiple grooves on the side away from the substrate, and each of the first limiting dams or the second limiting dams is located in the groove in a direction perpendicular to the substrate.

[0039] In one exemplary embodiment of this disclosure, the depth of the groove is 0.5-1 μm.

[0040] According to a second aspect of this disclosure, a method for manufacturing a display panel is provided, comprising:

[0041] Provides a drive backplane;

[0042] A light-emitting device layer is formed on one side of the driving backplate. The light-emitting device layer includes a pixel definition layer and a plurality of light-emitting devices defined by the pixel definition layer. The plurality of light-emitting devices includes a plurality of first light-emitting devices and a plurality of second light-emitting devices.

[0043] The first light-emitting device and the second light-emitting device form sub-pixels of different colors respectively;

[0044] Both the first light-emitting device and the second light-emitting device include a first electrode, a light-emitting functional layer, and a second electrode stacked along the direction away from the driving backplate;

[0045] The light-emitting functional layer includes a printing material layer and a vapor-deposited material layer stacked along the direction away from the driving backplate;

[0046] The thickness of the printing material layer of the first light-emitting device is greater than the thickness of the printing material layer of the second light-emitting device.

[0047] In one exemplary embodiment of this disclosure, forming a light-emitting device layer on one side of the driving backplate includes:

[0048] A plurality of the first electrodes are formed on one side of the drive backplate;

[0049] The pixel definition layer is formed on the side of the first electrode away from the driving backplate. The pixel definition layer has a plurality of pixel openings, and the plurality of pixel openings expose each of the first electrodes in a corresponding manner.

[0050] The printing material layer is formed on the side of the first electrode away from the driving backplate using an inkjet printing process, and the thickness of the printing material layer of the first light-emitting device is greater than the thickness of the printing material layer of the second light-emitting device.

[0051] A vapor-deposited material layer is formed on the side of the printed material layer away from the drive backplate by vapor deposition;

[0052] The second electrode is formed on the side of the vapor-deposited material layer away from the drive backplate.

[0053] According to a third aspect of this disclosure, a display device is provided, including a display panel as described in the first aspect.

[0054] The display panel disclosed herein includes a first light-emitting device and a second light-emitting device that correspondingly form sub-pixels of different colors. Both the first and second light-emitting devices include a first electrode, a light-emitting functional layer, and a second electrode stacked along a direction away from the driving backplane. The light-emitting functional layer includes a printing material layer and a vapor-deposited material layer stacked along a direction away from the driving backplane. The thickness of the printing material layer for the first light-emitting device is greater than the thickness of the printing material layer for the second light-emitting device. These printing material layers of different thicknesses can serve as optical thickness adjustment layers to improve the color gamut of the sub-pixels formed by the first and second light-emitting devices while reducing power consumption. Attached Figure Description

[0055] The above and other features and advantages of this disclosure will become more apparent from a detailed description of exemplary embodiments thereof with reference to the accompanying drawings.

[0056] Figure 1 This is a schematic diagram of the substrate structure in an exemplary embodiment of this disclosure;

[0057] Figure 2 This is a schematic diagram of the planar structure of the display panel in an exemplary embodiment of this disclosure;

[0058] Figure 3 yes Figure 2 Schematic diagram of the cross section along the A-A' direction;

[0059] Figure 4 yes Figure 2 Schematic diagram of the cross section in the B-B' direction;

[0060] Figure 5 This is a schematic diagram of the film structure of the light-emitting device in an exemplary embodiment of this disclosure.

[0061] The annotations for the main components in the diagram are explained below:

[0062] 100 - Substrate; 110 - Display area; 120 - Peripheral area; 200 - Driving circuit layer; 201 - Active layer; 202 - First gate insulating layer; 203 - First conductive layer; 204 - Second gate insulating layer; 205 - Interlayer dielectric layer; 206 - Second conductive layer; 207 - Passivation layer; 208 - Planarization layer; 081 - Groove; 300 - Light-emitting device layer; 310 - Pixel definition layer; 311 - Pixel aperture; 312 - First limiting dam; 313 - Second limiting dam; 314 - First sub-limiting dam; 315 - Second sub-limiting dam; 320 - Light-emitting functional layer; 321 - Printing material layer; 322 - Evaporated material layer; 330 - First electrode; 340 - Second electrode; 350 - First light-emitting device; 351 - First sub-light-emitting device; 352 - Second sub-light-emitting device; 350' - ... 353 - Second sub-light-emitting device; 354 ​​- Third sub-light-emitting device; 400 - Encapsulation layer; 500 - Color filter layer; 510 - Light-shielding part; 520 - Filter part; 521 - Red filter part; 522 - Blue filter part; 523 - Green filter part; 524 - White light-transmitting part; X - First direction; Y - Second direction; 10 - Sub-pixel; R - Red sub-pixel; B - Blue sub-pixel; G - Green sub-pixel; W - White sub-pixel; 11 - Hole injection layer; 12 - First hole transport layer; 13 - First light-emitting layer; 14 - First electron transport layer; 15 - First charge generation layer; 16 - Second hole transport layer; 17 - Second light-emitting layer; 18 - Second electron transport layer; 19 - Second charge generation layer; 20 - Third hole transport layer; 21 - Third light-emitting layer; 22 - Third electron transport layer. Detailed Implementation

[0063] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, they are provided so that this disclosure will be more comprehensive and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are set forth to give a full understanding of embodiments of this disclosure.

[0064] For clarity, the thickness of regions and layers may be exaggerated in the figures. The same reference numerals in the figures denote the same or similar structures, and therefore their detailed descriptions will be omitted.

[0065] The described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a full understanding of embodiments of this disclosure. However, those skilled in the art will recognize that the technical solutions of this disclosure can be practiced without one or more of the specific details described, or other methods, components, materials, etc., can be employed. In other instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring the main technical concept of this disclosure.

[0066] When a structure is "on" other structures, it may mean that the structure is integrally formed on other structures, or that the structure is "directly" set on other structures, or that the structure is "indirectly" set on other structures through another structure.

[0067] The terms “a,” “one,” and “the” are used to indicate the existence of one or more elements / components / etc.; the terms “including” and “having” are used to indicate an open-ended inclusion and that other elements / components / etc. may exist in addition to those listed. The terms “first” and “second” are used only as markers and are not a limitation on the number of objects.

[0068] In the field of large-size OLED panels, the mask evaporation process cannot form evaporation film layers of different thicknesses for different sub-pixels, resulting in a reduction in the color gamut of different sub-pixels.

[0069] like Figure 2 and Figure 3 As shown, this embodiment of the present disclosure provides a display panel having a plurality of sub-pixels 10, including a driving backplate and a light-emitting device layer 300. The light-emitting device layer 300 is disposed on one side of the driving backplate and includes a pixel definition layer 310 and a plurality of light-emitting devices defined by the pixel definition layer 310. The plurality of light-emitting devices includes a plurality of first light-emitting devices 350 and a plurality of second light-emitting devices 350'. The first light-emitting devices 350 and the second light-emitting devices 350' correspondingly form sub-pixels 10 of different colors. Both the first light-emitting devices 350 and the second light-emitting devices 350' include a first electrode 330, a light-emitting functional layer 320, and a second electrode 340 stacked along the direction away from the driving backplate. The light-emitting functional layer 320 includes a printing material layer 321 and a vapor-deposited material layer 322 stacked along the direction away from the driving backplate. The thickness of the printing material layer 321 of the first light-emitting device 350 is greater than the thickness of the printing material layer 321 of the second light-emitting device 350'.

[0070] The display panel provided in this disclosure includes a first light-emitting device 350 and a second light-emitting device 350' forming sub-pixels 10 of different colors. Both the first and second light-emitting devices 350 and 350' include a first electrode 330, a light-emitting functional layer 320, and a second electrode 340 stacked along the direction away from the driving backplane. The light-emitting functional layer 320 includes a printing material layer 321 and a vapor-deposited material layer 322 stacked along the direction away from the driving backplane. The thickness of the printing material layer 321 of the first light-emitting device 350 is greater than the thickness of the printing material layer 321 of the second light-emitting device 350'. The printing material layers 321 with different thicknesses can serve as optical thickness adjustment layers to improve the color gamut of the sub-pixels 10 formed by the first and second light-emitting devices 350 and reduce power consumption.

[0071] The components of the display panel provided in this embodiment will now be described in detail with reference to the accompanying drawings:

[0072] like Figure 2 and Figure 3 As shown, this disclosure provides a display panel, which can be an OLED (Organic Light-Emitting Diode) display panel, and more particularly a large-size OLED display panel. The display panel includes a driving backplane and a light-emitting device layer 300 disposed on one side of the driving backplane.

[0073] The display panel has multiple sub-pixels 10, each of which can emit different colors of light. The multiple sub-pixels 10 may include multiple red sub-pixels R, multiple green sub-pixels G, and multiple blue sub-pixels B. Furthermore, the multiple sub-pixels 10 may also include multiple white sub-pixels W. Specifically, the red sub-pixels R emit red light; the green sub-pixels G emit green light; the blue sub-pixels B emit blue light; and the white sub-pixels W emit white light.

[0074] like Figure 1 , Figure 2 and Figure 3 As shown, the driving backplane includes a substrate 100 and a driving circuit layer 200 disposed on one side of the substrate 100. The substrate 100 includes a display area and a peripheral area 120 located around the display area. The substrate 100 can be a glass substrate or a flexible substrate, etc., and this disclosure does not limit the specific type.

[0075] The driving circuit layer 200 may include a driving circuit, which includes pixel circuits and peripheral circuits. The pixel circuits are located in the display area 110, and the peripheral circuits are located in the peripheral area 120. The peripheral circuits are connected to the pixel circuits. The light-emitting device layer 300 is disposed on one side of the driving backplane. The light-emitting device layer 300 includes a pixel definition layer 310 and multiple light-emitting devices defined by the pixel definition layer 310. The light-emitting devices are located in the display area 110. The pixel circuits are used to drive the light-emitting devices of the OLED display panel to emit light, and the peripheral circuits are used to provide driving signals to the pixel circuits to control the light-emitting devices to emit light. One pixel circuit and one light-emitting device combine to form a sub-pixel 10. The pixel circuit can be a 7T1C, 7T2C, 6T1C, or 6T2C pixel circuit, etc., and its structure is not specifically limited here. Here, nTmC indicates that one pixel circuit includes n transistors (represented by the letter "T") and m capacitors (represented by the letter "C"). There are multiple pixel circuits, and one pixel circuit drives one light-emitting device to emit light. The peripheral circuit may include a gate driving circuit and a light-emitting control circuit, and of course, it may also include other circuits. No specific limitations are made on the specific structure of the peripheral circuit here.

[0076] The driving circuit layer 200 is a multilayer film stacked structure. Taking the transistor in the pixel circuit as a top-gate thin-film transistor as an example, the driving circuit layer 200 may include an active layer 201, a first gate insulating layer 202, a first conductive layer 203, a second gate insulating layer 204, an interlayer dielectric layer 205, a second conductive layer 206, a passivation layer 207, and a planarization layer 208.

[0077] An active layer 201 is disposed on one side of the substrate 100, and includes the active region of a transistor. A first gate insulating layer 202 is disposed on the side of the active layer 201 away from the substrate 100, and covers the active layer 201. The first gate insulating layer 202 may be a single film layer such as silicon nitride, silicon oxide, or aluminum oxide, or a multi-film layer formed by combinations thereof. A first conductive layer 203 is disposed on the side of the first gate insulating layer 202 away from the substrate 100, and includes the gate of the transistor. The material of the first conductive layer 203 may be a metal material such as aluminum, copper, titanium, or molybdenum, or a combination thereof. A second gate insulating layer 204 is disposed on the side of the first conductive layer 203 away from the substrate 100, and an interlayer dielectric layer 205 is disposed on the side of the second gate insulating layer 204 away from the substrate 100, and covers the first conductive layer 203. The interlayer dielectric layer 205 can be a single film layer such as silicon nitride, silicon oxide, or aluminum oxide, or a multi-film layer formed by combinations thereof. The second conductive layer 206 is disposed on the side of the interlayer dielectric layer 205 away from the substrate 100, and includes the source and drain of a transistor. The source and drain of the transistor are connected to the active layer 201. The material of the second conductive layer 206 can be a metal such as aluminum, copper, titanium, or molybdenum, or a combination thereof. The passivation layer 207 is disposed on the side of the second conductive layer 206 away from the substrate 100, and covers the second conductive layer 206. The material of the passivation layer 207 can be silicon oxide, silicon oxynitride, or other materials. The planarization layer 208 is disposed on the side of the passivation layer 207 away from the substrate 100. Multiple grooves 081 are formed on the surface of the planarization layer 208 away from the substrate 100.

[0078] The pixel definition layer 310 may be disposed on one side of the driving backplane, for example, on the surface of the planarization layer 208 away from the substrate 100. The pixel definition layer 310 is used to separate the various light-emitting devices. Specifically, the pixel definition layer 310 may have multiple pixel openings 311, and the area defined by each pixel opening 311 is the area of ​​one light-emitting device. The shape of the pixel opening 311, that is, the shape of the outline of the orthographic projection of the pixel opening 311 onto the driving backplane, may be a polygon, a smooth closed curve, or other shapes. The smooth closed curve may be a circle, an ellipse, etc., and is not specifically limited here.

[0079] The plurality of light-emitting devices includes a plurality of first light-emitting devices 350 and a plurality of second light-emitting devices 350'. The first light-emitting devices 350 and the second light-emitting devices 350' respectively form sub-pixels 10 of different colors. Each of the first light-emitting devices 350 and the second light-emitting devices 350' includes a first electrode 330, a light-emitting functional layer 320, and a second electrode 340 stacked along a direction away from the driving backplate.

[0080] The first electrode 330 can be disposed on the same surface of the driving backplate as the pixel definition layer 310, and can serve as the anode of the light-emitting device. The outline of the orthographic projection of the first electrode 330 on the driving backplate can be a polygon, a smooth curve, or other shape. Each pixel opening 311 of the pixel definition layer 310 exposes the first electrode 330 in a one-to-one correspondence. Each pixel opening 311 is no larger than the first electrode 330 it exposes; that is, the range of any pixel opening 311 is within the boundary of its corresponding first electrode 330. Further, the orthographic projection of the first electrode 330 on the substrate 100 at least partially overlaps with the orthographic projection of the interval between two adjacent grooves 081 of the planarization layer 208 on the substrate 100. For example, the first electrode 330 covers the sidewall of the groove 081 and the interval between two adjacent grooves 081. The first electrode 330 can be a single-layer or multi-layer structure, and its material can include one or more of conductive metals, metal oxides, and alloys. The thickness of the first electrode 330 can be 50nm-80nm, specifically 50nm, 60nm, 70nm or 80nm, etc.

[0081] The light-emitting functional layer 320 is used to transport electrons and holes, and can generate visible light by causing holes and electrons to recombine into excitons, which then radiate photons. The second electrode 340 may cover the light-emitting functional layer 320 and can serve as the cathode of the light-emitting device. The second electrode 340 can be a single-layer or multi-layer structure, and its material may include one or more of conductive metals, metal oxides, and alloys. Each light-emitting device can share the same second electrode 340. Specifically, the second electrode 340 is a continuous conductive layer covering the light-emitting functional layer 320 and the pixel definition layer 310 of each light-emitting device; that is, the orthogonal projection of the second electrode 340 onto the pixel definition layer 310 covers each pixel opening 311.

[0082] The light-emitting functional layer 320 includes a printing material layer 321 and a vapor-deposited material layer 322 stacked along the direction away from the driving backplate. The thickness of the printing material layer 321 of the first light-emitting device 350 is greater than the thickness of the printing material layer 321 of the second light-emitting device 350'. The printing material layer 321 is formed by inkjet printing, and the vapor-deposited material layer 322 is formed by mask vapor deposition. In some embodiments of this disclosure, the thickness of the printing material layer 321 of the first light-emitting device 350 is 90-110 nm thicker than the thickness of the printing material layer 321 of the second light-emitting device 350', specifically 90 nm, 92 nm, 94 nm, 95 nm, 96 nm, 98 nm, 100 nm, 102 nm, 104 nm, 105 nm, 106 nm, 108 nm, or 110 nm, but is not limited thereto. It should be noted that, due to process errors and the influence of pixel definition layer 310, the thickness of different areas of the printing material layer 321 may vary, but overall, the thickness of the printing material layer 321 of the first light-emitting device 350 is greater than the thickness of the printing material layer 321 of the second light-emitting device 350'.

[0083] The first light-emitting device 350 and the second light-emitting device 350' can correspondingly form sub-pixels 10 of different colors. In some embodiments of this disclosure, the first light-emitting device 350 correspondingly forms a blue sub-pixel B or a red sub-pixel R, and the second light-emitting device 350' correspondingly forms a green sub-pixel G or a white sub-pixel W. A thicker printing material layer 321 is beneficial to improving the display quality of the blue sub-pixel B and the red sub-pixel R, while a thinner printing material layer 321 helps to improve the display quality of the green sub-pixel G and the white sub-pixel W.

[0084] In some embodiments of this disclosure, the display panel further includes a color filter layer 500 disposed on the side of the light-emitting device layer 300 away from the driving backplate. The color filter layer 500 includes a light-shielding portion 510 and a plurality of light-filtering portions 520 separated by the light-shielding portion 510. The material of the light-shielding portion 510 may include black resin. The light-filtering portions 520 are arranged one-to-one with the light-emitting devices in a direction perpendicular to the driving backplate. The light-filtering portions 520 may be made of a light-filtering material, and each light-filtering portion 520 allows only one color of light to pass through. At the same time, each light-filtering portion 520 is arranged one-to-one with the light-emitting device in a direction perpendicular to the driving backplate, so that the light emitted by the light-emitting device can be emitted through the corresponding light-filtering portion 520. Each light-emitting device and its corresponding light-filtering portion 520 can form a sub-pixel 10. The light-filtering portion 520 includes a red light-filtering portion 521, a blue light-filtering portion 522, a green light-filtering portion 523, and a white light-transmitting portion 524. Among them, the red filter section 521 allows red light to pass through, the blue filter section 522 allows blue light to pass through, the green filter section 523 only allows green light to pass through, and the white light-transmitting section 524 can be made of transparent material.

[0085] Both the first light-emitting device 350 and the second light-emitting device 350' are white light devices. The first light-emitting device 350 is correspondingly arranged with the blue filter section 522 or the red filter section 521, and the second light-emitting device 350' is correspondingly arranged with the green filter section 523 or the white light-transmitting section 524.

[0086] In some embodiments of this disclosure, the first light-emitting device 350 includes a first sub-light-emitting device 351 and a second sub-light-emitting device 352. The first sub-light-emitting device 351 forms a blue sub-pixel B, and the second sub-light-emitting device 352 forms a red sub-pixel R. Specifically, the first sub-light-emitting device 351 is disposed corresponding to the blue filter 522 to form the blue sub-pixel B. The second sub-light-emitting device 352 is disposed corresponding to the red filter 521 to form the red sub-pixel R.

[0087] The second light-emitting device 350' includes a third sub-light-emitting device 353 and a fourth sub-light-emitting device 354. The third sub-light-emitting device 353 forms a green sub-pixel G, and the fourth sub-light-emitting device 354 forms a white sub-pixel W. The third sub-light-emitting device 353 is disposed in conjunction with the green filter 523 to form the green sub-pixel G. The fourth sub-light-emitting device 354 is disposed in conjunction with the white light-transmitting part 524 to form the white sub-pixel W.

[0088] like Figure 2 , Figure 3 and Figure 4 As shown, in some embodiments of this disclosure, the printing material layers 321 of multiple first sub-light-emitting devices 351 are connected as a whole, the printing material layers 321 of multiple second sub-light-emitting devices 352 are connected as a whole, and the printing material layers 321 of the first sub-light-emitting devices 351 and the second sub-light-emitting devices 352 are connected as a whole, that is, the first sub-light-emitting devices 351 and the second sub-light-emitting devices 352 share the printing material layer 321. Similarly, the printing material layers 321 of multiple third sub-light-emitting devices 353 are connected as a whole, and the printing material layers 321 of multiple fourth sub-light-emitting devices 354 are connected as a whole, and the printing material layers 321 of the third sub-light-emitting devices 353 and the fourth sub-light-emitting devices 354 are connected as a whole. That is, the third sub-light-emitting devices 353 and the fourth sub-light-emitting devices 354 share the printing material layer 321. Thus, while adjusting the optical thickness by using printing material layers 321 of different thicknesses, this does not significantly increase the complexity of the process, reduces costs, and improves the yield of the display panel.

[0089] In this disclosure, the design of the printing material layer 321 in the first sub-light-emitting device 351, the second sub-light-emitting device 352, the third sub-light-emitting device 353 and the fourth sub-light-emitting device 354 can be completed by structural design of the pixel definition layer 310.

[0090] The pixel definition layer 310 includes a plurality of first defining dams 312 extending along a first direction X and spaced apart along a second direction Y, and a plurality of second defining dams 313 extending along the second direction Y and spaced apart along the first direction X. The first direction X and the second direction Y intersect, and the first direction X and the second direction Y may be approximately perpendicular. The plurality of first defining dams 312 and the plurality of second defining dams 313 mutually define the extent of each light-emitting device. The second defining dams 313 include first sub-defining dams 314 and second sub-defining dams 315 alternately arranged along the first direction X. The first sub-defining dams 314 are located between the first sub-light-emitting device 351 and the second sub-light-emitting device 352, or the first sub-defining dams 314 are located between the third sub-light-emitting device 353 and the fourth sub-light-emitting device 354. The second sub-defining dams 315 are located between the first light-emitting device 350 and the second light-emitting device 350'. The height of the first sub-defining dams 314 is less than the height of the second sub-defining dams 315, and the first sub-defining dams 314 include a hydrophilic material, while the second defining dams 315 include a hydrophobic material.

[0091] In this embodiment, the second sub-dam 315 is relatively high and made of a hydrophobic material, used to separate the first light-emitting device 350 and the second light-emitting device 350', so that their printing material layers 321 are isolated from each other, thus forming printing material layers 321 of different thicknesses. The first sub-dam 314 is relatively low and made of a hydrophilic material, so that the printing material layers 321 of the first sub-light-emitting device 351 and the second sub-light-emitting device 352 can be interconnected, or the printing material layers 321 of the third sub-light-emitting device 353 and the fourth sub-light-emitting device 354 can be interconnected, which helps to reduce printing difficulty and improve the yield of the display panel. Specifically, the height of the first dam 312 is 0.3-1 μm; the height of the first sub-dam 314 is 0.3-1 μm; and the height of the second sub-dam 315 is 1-1.5 μm. Each limiting dam (including the first limiting dam 312 and the second limiting dam 313) has a certain angle between its sidewall and the plane parallel to the substrate 100, and the angle can be in the range of 80°-90°.

[0092] Furthermore, the plurality of grooves 081 in the planarization layer 208 are correspondingly disposed with the first sub-defining dam 314, the second sub-defining dam 315, and the first defining dam 312 in a direction perpendicular to the substrate 100. That is, each first defining dam 312 or second defining dam 313 is located within each groove 081, and the orthographic projection of the first defining dam 312 on the substrate 100 at least partially overlaps with the orthographic projection of the groove 081 on the substrate 100, and the orthographic projection of the second defining dam 313 on the substrate 100 at least partially overlaps with the orthographic projection of the groove 081 on the substrate 100. The depth of the grooves 081, combined with the defining dams of different heights, can form a light-emitting device that conforms to the requirements of this disclosure. Furthermore, the depth of the grooves 081 is 0.5-1 μm. The heights of the first sub-defining dam 314 and the second sub-defining dam 315 are both greater than the depth of the grooves 081, so as to define the extent of each light-emitting device. For example, if the depth of groove 081 is 0.5μm, then the height of the first sub-limiting dam 314 is 0.5-1μm.

[0093] like Figure 5 As shown, the printing material layer 321 and the vapor-deposited material can contain multiple film layers, which can be selected according to the structure of the light-emitting device.

[0094] In some embodiments of this disclosure, the printing material layer 321 is used to regulate hole injection and transport. For example, the printing material layer 321 may include a hole injection layer 11 and / or a hole transport layer. The hole transport layer is used to transport holes injected from the anode to the target film layer and to block electrons from the cathode from directly flowing to the anode. Due to the large HOMO energy level difference between the anode and the hole transport layer, the hole injection layer 11 is used to increase interfacial charge injection.

[0095] The vapor-deposited material layer 322 includes a phosphorescent layer and a fluorescent layer, the phosphorescent layer emitting a different color than the fluorescent layer. Specifically, the fluorescent layer can be a blue fluorescent layer emitting blue light, and the phosphorescent layer can be a yellow phosphorescent layer emitting yellow light. Further, the yellow phosphorescent layer can include both a green phosphorescent layer and a red phosphorescent layer, which are mixed to emit yellow light.

[0096] In one specific embodiment, the printed material layer 321 includes a hole injection layer 11. The vapor-deposited material layer 322 includes a first hole transport layer 12, a first light-emitting layer 13, a first electron transport layer 14, a first charge generation layer 15, a second hole transport layer 16, a second light-emitting layer 17, a second electron transport layer 18, a second charge generation layer 19, a third hole transport layer 20, a third light-emitting layer 21, and a third electron transport layer 22, stacked along the direction away from the driving backplate. The first light-emitting layer 13 is a blue fluorescent light-emitting layer, the second light-emitting layer 17 is a yellow phosphorescent light-emitting layer, and the third light-emitting layer 21 is a blue fluorescent light-emitting layer.

[0097] The hole injection layer 11 of the first light-emitting device 350 has a thickness of 110nm-120nm, such as 110nm, 112nm, 115nm, 118nm, or 120nm. The hole injection layer 11 of the second light-emitting device 350' has a thickness of 10nm-20nm, such as 10nm, 12nm, 15nm, 16nm, 18nm, or 20nm. The thickness of each film layer contained in the vapor-deposited material layer 322 of both the first and second light-emitting devices 350 and 350' is basically the same. Specifically, the thickness of the first hole transport layer 12 is 50nm-70nm, such as 55nm, 60nm, or 65nm. The thickness of the first light-emitting layer 13 is 15nm-35nm, such as 20nm, 25nm, or 30nm. The thickness of the first electron transport layer 14 is 9nm-11nm, such as 9.5nm, 10nm, or 10.5nm. The thickness of the first charge generation layer 15 is 14nm-16nm, such as 14.5nm, 15nm, or 15.5nm. The thickness of the second hole transport layer 16 is 9nm-11nm, such as 9.5nm, 10nm, or 10.5nm. The thickness of the second light-emitting layer 17 is 50nm-70nm, such as 55nm, 60nm, or 65nm. The thickness of the second electron transport layer 18 is 9nm-11nm, such as 9.5nm, 10nm, or 10.5nm. The thickness of the second charge generation layer 19 is 40nm-60nm, such as 45nm, 50nm, or 55nm. The thickness of the third hole transport layer 20 is 40nm-60nm, such as 45nm, 50nm, or 55nm. The thickness of the third light-emitting layer 21 is 15nm-35nm, such as 20nm, 25nm, or 30nm. The thickness of the third electron transport layer 22 is 15nm-35nm, such as 20nm, 25nm or 30nm.

[0098] like Figure 3 and Figure 4As shown, the display panel may also include an encapsulation layer 400, which covers the surface of the light-emitting device layer 300 away from the driving backplate. The encapsulation layer 400 protects the light-emitting device layer 300 from external water and oxygen corrosion. Specifically, the encapsulation layer 400 is disposed between the light-emitting device layer 300 and the color filter layer 500.

[0099] In some embodiments of this disclosure, thin-film encapsulation (TFE) can be used to achieve encapsulation. Specifically, the encapsulation layer 400 may include a first inorganic layer, an organic layer, and a second inorganic layer. The first inorganic layer covers the surface of the light-emitting device layer 300 away from the driving backplane. The organic layer may be disposed on the surface of the first inorganic layer away from the driving backplane, and the boundary of the organic layer is defined inside the boundary of the first inorganic layer. The second inorganic layer covers the organic layer and the first inorganic layer that is not covered by the organic layer. The second inorganic layer can block water and oxygen intrusion, and the flexible organic layer can achieve planarization.

[0100] like Figure 2 , Figure 3 As shown, this disclosure also provides a method for manufacturing a display panel, including:

[0101] Step S100: Provide the drive backplane;

[0102] In step S200, a light-emitting device layer 300 is formed on one side of the driving backplate. The light-emitting device layer 300 includes a pixel definition layer 310 and a plurality of light-emitting devices defined by the pixel definition layer 310. The plurality of light-emitting devices includes a plurality of first light-emitting devices 350 and a plurality of second light-emitting devices 350'.

[0103] Among them, the first light-emitting device 350 and the second light-emitting device 350' form sub-pixels 10 of different colors respectively;

[0104] Both the first light-emitting device 350 and the second light-emitting device 350' include a first electrode 330, a light-emitting functional layer 320 and a second electrode 340 stacked along the direction away from the driving backplate.

[0105] The light-emitting functional layer 320 includes a printing material layer 321 and a vapor-deposited material layer 322 stacked along the direction away from the driving backplate;

[0106] The thickness of the printing material layer 321 of the first light-emitting device 350 is greater than the thickness of the printing material layer 321 of the second light-emitting device 350'.

[0107] In some embodiments of this disclosure, step S200 includes:

[0108] Step S210: A plurality of first electrodes 330 are formed on one side of the drive backplate;

[0109] In step S220, a pixel definition layer 310 is formed on the side of the first electrode 330 away from the driving backplate. The pixel definition layer 310 has a plurality of pixel openings 311, and the plurality of pixel openings 311 expose each first electrode 330 in a one-to-one correspondence.

[0110] In step S230, an inkjet printing process is used to form a printing material layer 321 on the side of the first electrode 330 away from the driving back plate. The thickness of the printing material layer 321 of the first light-emitting device 350 is greater than the thickness of the printing material layer 321 of the second light-emitting device 350'.

[0111] Step S240: Evaporation material layer 322 is formed on the side of the printing material layer 321 away from the drive backplate;

[0112] In step S250, a second electrode 340 is formed on the side of the vapor-deposited material layer 322 away from the drive backplate.

[0113] This disclosure also provides a display device, including a display panel. The display panel can be any of the display panels described in the above embodiments, and its specific structure and beneficial effects can be referred to the embodiments of the display panel described above, which will not be repeated here. The display device of this disclosure can be an electronic device such as a tablet computer or a television, which will not be listed here.

[0114] It should be noted that although the steps of the method in this disclosure are described in a specific order in the accompanying drawings, this does not require or imply that the steps must be performed in that specific order, or that all the steps shown must be performed to achieve the desired result. Additional or alternative steps, such as omitting certain steps, combining multiple steps into one step, and / or breaking down one step into multiple steps, should all be considered part of this disclosure.

[0115] It should be understood that this disclosure is not limited to the detailed structure and arrangement of the components presented in this specification. This disclosure is capable of other embodiments and can be implemented and performed in various ways. The foregoing variations and modifications fall within the scope of this disclosure. It should be understood that this disclosure, as disclosed and defined in this specification, extends to all alternative combinations of two or more individual features mentioned or apparent in the text and / or drawings. All these different combinations constitute multiple alternative aspects of this disclosure. The embodiments described in this specification illustrate the best known mode for implementing this disclosure and will enable those skilled in the art to utilize this disclosure.

Claims

1. A display panel, characterized in that, It has multiple sub-pixels, including: Drive backplane; A light-emitting device layer is disposed on one side of the driving backplate. The light-emitting device layer includes a pixel definition layer and a plurality of light-emitting devices defined by the pixel definition layer. The plurality of light-emitting devices includes a plurality of first light-emitting devices and a plurality of second light-emitting devices. The first light-emitting device and the second light-emitting device form sub-pixels of different colors respectively; Both the first light-emitting device and the second light-emitting device include a first electrode, a light-emitting functional layer, and a second electrode stacked along the direction away from the driving backplate; The light-emitting functional layer includes a printing material layer and a vapor-deposited material layer stacked along the direction away from the driving backplate; The thickness of the printing material layer of the first light-emitting device is greater than the thickness of the printing material layer of the second light-emitting device; The display panel has multiple sub-pixels, including multiple red sub-pixels, multiple blue sub-pixels, multiple green sub-pixels, and multiple white sub-pixels; The first light-emitting device forms the blue sub-pixel or the red sub-pixel, and the second light-emitting device forms the green sub-pixel or the white sub-pixel. The first light-emitting device includes a first sub-light-emitting device and a second sub-light-emitting device, wherein the first sub-light-emitting device forms the blue sub-pixel and the second sub-light-emitting device forms the red sub-pixel. The second light-emitting device includes a third sub-light-emitting device and a fourth sub-light-emitting device, wherein the third sub-light-emitting device forms a green sub-pixel and the fourth sub-light-emitting device forms a white sub-pixel. The printing material layers of multiple first sub-light-emitting devices are connected as a whole, the printing material layers of multiple second sub-light-emitting devices are connected as a whole, and the printing material layers of the first sub-light-emitting devices and the printing material layers of the second sub-light-emitting devices are connected as a whole. The printing material layers of the plurality of third sub-light-emitting devices are connected as a whole, the printing material layers of the plurality of fourth sub-light-emitting devices are connected as a whole, and the printing material layers of the third sub-light-emitting devices and the printing material layers of the fourth sub-light-emitting devices are connected as a whole.

2. The display panel according to claim 1, characterized in that, The display panel also includes: A color filter layer is disposed on the side of the light-emitting device layer away from the driving backplate. The color filter layer includes a light-shielding part and a plurality of light-filtering parts separated by the light-shielding part. The light-filtering parts are arranged one-to-one with the light-emitting devices in a direction perpendicular to the driving backplate. The light-filtering parts include a red light-filtering part, a blue light-filtering part, a green light-filtering part, and a white light-transmitting part. Wherein, both the first light-emitting device and the second light-emitting device are white light devices, the first light-emitting device is disposed corresponding to the blue filter or the red filter, and the second light-emitting device is disposed corresponding to the green filter or the white light-transmitting part.

3. The display panel according to claim 1, characterized in that, The pixel definition layer includes a plurality of first defining dams extending along a first direction and spaced apart along a second direction, and a plurality of second defining dams extending along the second direction and spaced apart along the first direction. The first direction and the second direction intersect, and the plurality of first defining dams and the plurality of second defining dams intersect each other to define the range of each light-emitting device. The second limiting dam includes a first sub-limiting dam and a second sub-limiting dam arranged alternately along the first direction; The first sub-limiting dam is located between the first sub-light-emitting device and the second sub-light-emitting device, or the first sub-limiting dam is located between the third sub-light-emitting device and the fourth sub-light-emitting device; The second sub-limiting dam is located between the first light-emitting device and the second light-emitting device; The height of the first sub-dam is less than the height of the second sub-dam, and the first sub-dam comprises a hydrophilic material, while the second sub-dam comprises a hydrophobic material.

4. The display panel according to claim 3, characterized in that, The height of the first limiting dam is 0.3-1 μm; The height of the first sub-dam is 0.3-1 μm, and the height of the second sub-dam is 1-1.5 μm.

5. The display panel according to claim 1, characterized in that, The printed material layer is used to regulate the injection or transport of holes.

6. The display panel according to claim 1, characterized in that, The vapor-deposited material layer includes a phosphorescent layer and a fluorescent layer, wherein the emission color of the phosphorescent layer is different from that of the fluorescent layer.

7. The display panel according to claim 6, characterized in that, The printed material layer includes a hole injection layer; The vapor-deposited material layer includes a first hole transport layer, a first light-emitting layer, a first electron transport layer, a first charge generation layer, a second hole transport layer, a second light-emitting layer, a second electron transport layer, a second charge generation layer, a third hole transport layer, a third light-emitting layer, and a third electron transport layer, stacked in a direction away from the driving backplate. The first light-emitting layer is a blue fluorescent light-emitting layer, the second light-emitting layer is a yellow phosphorescent light-emitting layer, and the third light-emitting layer is a blue fluorescent light-emitting layer.

8. The display panel according to claim 1, characterized in that, The thickness of the printing material layer of the first light-emitting device is 90-110 nm thicker than the thickness of the printing material layer of the second light-emitting device.

9. The display panel according to claim 3, characterized in that, The driving backplane includes a substrate and a driving circuit layer disposed on one side of the substrate, the driving circuit layer including a planarization layer; The planarization layer has multiple grooves on the side away from the substrate, and each of the first limiting dams or the second limiting dams is located in the groove in a direction perpendicular to the substrate.

10. The display panel according to claim 9, characterized in that, The depth of the groove is 0.5-1μm.

11. A method for manufacturing a display panel, characterized in that, include: Provides a drive backplane; A light-emitting device layer is formed on one side of the driving backplate. The light-emitting device layer includes a pixel definition layer and a plurality of light-emitting devices defined by the pixel definition layer. The plurality of light-emitting devices includes a plurality of first light-emitting devices and a plurality of second light-emitting devices. The first light-emitting device and the second light-emitting device form sub-pixels of different colors respectively; Both the first light-emitting device and the second light-emitting device include a first electrode, a light-emitting functional layer, and a second electrode stacked along the direction away from the driving backplate; The light-emitting functional layer includes a printing material layer and a vapor-deposited material layer stacked along the direction away from the driving backplate; The thickness of the printing material layer of the first light-emitting device is greater than the thickness of the printing material layer of the second light-emitting device; The display panel has multiple sub-pixels, including multiple red sub-pixels, multiple blue sub-pixels, multiple green sub-pixels, and multiple white sub-pixels; The first light-emitting device forms the blue sub-pixel or the red sub-pixel, and the second light-emitting device forms the green sub-pixel or the white sub-pixel. The first light-emitting device includes a first sub-light-emitting device and a second sub-light-emitting device, wherein the first sub-light-emitting device forms the blue sub-pixel and the second sub-light-emitting device forms the red sub-pixel. The second light-emitting device includes a third sub-light-emitting device and a fourth sub-light-emitting device, wherein the third sub-light-emitting device forms a green sub-pixel and the fourth sub-light-emitting device forms a white sub-pixel. The printing material layers of multiple first sub-light-emitting devices are connected as a whole, the printing material layers of multiple second sub-light-emitting devices are connected as a whole, and the printing material layers of the first sub-light-emitting devices and the printing material layers of the second sub-light-emitting devices are connected as a whole. The printing material layers of the plurality of third sub-light-emitting devices are connected as a whole, the printing material layers of the plurality of fourth sub-light-emitting devices are connected as a whole, and the printing material layers of the third sub-light-emitting devices and the printing material layers of the fourth sub-light-emitting devices are connected as a whole.

12. The method for manufacturing a display panel according to claim 11, characterized in that, Forming a light-emitting device layer on one side of the driving backplate includes: A plurality of the first electrodes are formed on one side of the drive backplate; The pixel definition layer is formed on the side of the first electrode away from the driving backplate. The pixel definition layer has a plurality of pixel openings, and the plurality of pixel openings expose each of the first electrodes in a corresponding manner. The printing material layer is formed on the side of the first electrode away from the driving backplate using an inkjet printing process, and the thickness of the printing material layer of the first light-emitting device is greater than the thickness of the printing material layer of the second light-emitting device. A vapor-deposited material layer is formed on the side of the printed material layer away from the drive backplate by vapor deposition; The second electrode is formed on the side of the vapor-deposited material layer away from the drive backplate.

13. A display device, characterized in that, Includes the display panel as described in any one of claims 1-10.

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