Display panel, preparation method thereof and display device

Abstract

Embodiments of the present disclosure provide a display panel, a manufacturing method thereof and a display device. The display panel comprises a substrate, a pixel definition layer and a first color sub-pixel on one side of the substrate. The pixel definition layer is formed with an opening region, and the first color sub-pixel is defined by a corresponding opening region. The first color sub-pixel comprises a first color first light emitting structure layer, a first charge generation layer and a first color second light emitting structure layer. The first color second light emitting structure layer comprises a first part and a second part. A normal projection of the first part on the substrate overlaps a normal projection of the first color first light emitting structure layer on the substrate. A normal projection of the second part on the substrate is located outside the normal projection of the first color first light emitting structure layer on the substrate. In the case that the first color first light emitting structure layer and the first part emit light, the second part emits light under the action of a transverse current in the first charge generation layer. The display panel of the present disclosure can reduce power consumption and improve the service life of the display panel.

Description

Technical Field

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

[0002] OLED (Organic Light Emitting Diode) is widely used due to its advantages such as self-emission, fast response, wide viewing angle, and ability to be fabricated on flexible substrates.

[0003] In existing technologies, stacked OLED display panels can improve brightness and luminous efficiency, but stacked OLED display panels have a problem of lateral current crosstalk, which can cause color shift. Therefore, how to utilize lateral current has become an urgent problem to be solved. Summary of the Invention

[0004] This disclosure provides a display panel and its manufacturing method, as well as a display device, to solve or alleviate one or more technical problems in the prior art.

[0005] As a first aspect of the present disclosure, an embodiment of the present disclosure provides a display panel, including: a substrate, a pixel defining layer, and a first color sub-pixel. The pixel defining layer is located on one side of the substrate and has an opening area. The first color sub-pixel is defined by a corresponding opening area and includes a first color first light-emitting structure layer, a first charge-generating layer, and a first color second light-emitting structure layer sequentially disposed on the side of the substrate where the pixel defining layer is formed. The orthographic projections of the first color first light-emitting structure layer and the first color second light-emitting structure layer on the substrate are both located within the orthographic projection range of the first charge-generating layer on the substrate. The first color second light-emitting structure layer includes a first portion and a second portion. The orthographic projection of the first portion on the substrate overlaps with the orthographic projection of the first color first light-emitting structure layer on the substrate, and the orthographic projection of the second portion on the substrate is located outside the orthographic projection of the first color first light-emitting structure layer on the substrate. When both the first color first light-emitting structure layer and the first portion emit light, the second portion emits light under the action of a transverse current in the first charge-generating layer.

[0006] In some possible implementations, the second part is set up around the first part.

[0007] In some possible implementations, the second part is adjacent to the boundary of the opening region that defines the opening region of the first color sub-pixel.

[0008] In some possible implementations, the display panel further includes a second color sub-pixel disposed adjacent to the first color sub-pixel. The second color sub-pixel includes a second color first light-emitting structure layer, a second charge-generating layer, and a second color second light-emitting structure layer disposed sequentially on the side of the substrate where the pixel limiting layer is formed. The orthographic projections of the second color first light-emitting structure layer and the second color second light-emitting structure layer on the substrate are both located within the orthographic projection range of the second charge-generating layer on the substrate. The area of ​​the portion of the first color second light-emitting structure layer on the surface of the pixel limiting layer facing away from the substrate is greater than the area of ​​the portion of the second color second light-emitting structure layer on the surface of the pixel limiting layer facing away from the substrate.

[0009] In some possible implementations, the portion of the first color second light-emitting structure layer located on the side of the pixel defining layer away from the substrate includes a first structure portion and a second structure portion. The second structure portion overlaps the surface of the second color second light-emitting structure layer away from the substrate, and the orthogonal projection area of ​​the first structure portion on the substrate is smaller than the orthogonal projection area of ​​the second structure portion on the substrate.

[0010] In some possible implementations, the portion of the first color second light-emitting structure layer located on the side of the pixel defining layer away from the substrate includes a first structure portion and a second structure portion. The second structure portion overlaps the surface of the second color second light-emitting structure layer away from the substrate, and the orthogonal projection area of ​​the first structure portion on the substrate is larger than the orthogonal projection area of ​​the second structure portion on the substrate.

[0011] In some possible implementations, the orthographic projection of the first color first luminescent structure layer on the substrate and the orthographic projection of the second color first luminescent structure layer on the substrate do not overlap.

[0012] In some possible implementations, at least a portion of the first color first light-emitting structure layer on the surface of the pixel defining layer facing away from the substrate overlaps with the surface of the second color first light-emitting structure layer facing away from the substrate.

[0013] In some possible implementations, the first color subpixel is a red subpixel, and the second color subpixel is either a blue or green subpixel.

[0014] In some possible implementations, the first charge generation layer and the second charge generation layer are located in the same layer.

[0015] In some possible implementations, the first charge generation layer and the second charge generation layer include an N-type charge generation layer and a P-type charge generation layer, both of which are doped layers.

[0016] In some possible implementations, the first color sub-pixel further includes at least one of an electron injection layer, an electron transport layer, a hole injection layer, and a hole transport layer.

[0017] In some possible implementations, the display panel further includes a first electrode layer and a second electrode layer, the first electrode layer being located in the opening area, a first color first light-emitting structure layer being located on the side of the first electrode layer away from the substrate, and a second electrode layer being located on the side of the first color second light-emitting structure layer away from the substrate.

[0018] As a second aspect of this disclosure, this disclosure provides a method for manufacturing a display panel, comprising:

[0019] Provide a base;

[0020] A pixel-defining layer is formed on one side of the substrate, and the pixel-defining layer has an opening region;

[0021] A first color sub-pixel is formed on one side of the substrate where a pixel defining layer is formed, and is defined by a corresponding opening region. The first color sub-pixel includes a first color first light-emitting structure layer, a first charge generating layer, and a first color second light-emitting structure layer sequentially disposed on the side of the substrate where the pixel defining layer is formed. The orthographic projections of the first color first light-emitting structure layer and the first color second light-emitting structure layer on the substrate are both located within the orthographic projection range of the first charge generating layer on the substrate. The first color second light-emitting structure layer includes a first part and a second part. The orthographic projection of the first part on the substrate overlaps with the orthographic projection of the first color first light-emitting structure layer on the substrate. The orthographic projection of the second part on the substrate is located outside the orthographic projection of the first color first light-emitting structure layer on the substrate. When both the first color first light-emitting structure layer and the first part emit light, the second part emits light under the action of a transverse current in the first charge generating layer.

[0022] As a third aspect of the present disclosure, the present disclosure provides a display device including the display panel in any embodiment of the present disclosure.

[0023] The technical solutions of this disclosure can effectively utilize crosstalk current, reduce power consumption, enhance the user experience in different color temperature environments, extend pixel lifespan, and thus improve the lifespan of the display panel.

[0024] The above overview is for illustrative purposes only and is not intended to be limiting in any way. Further aspects, embodiments, and features of this disclosure will become readily apparent from the accompanying drawings and the following detailed description, in addition to the illustrative aspects, embodiments, and features described above. Attached Figure Description

[0025] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the various drawings denote the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings depict only some embodiments according to this disclosure and should not be construed as limiting the scope of this disclosure.

[0026] Figure 1 This is a cross-sectional schematic diagram of a display panel in one embodiment of a related technology;

[0027] Figure 2 This is a cross-sectional schematic diagram of the display panel in another embodiment of the related technology;

[0028] Figure 3 This is a schematic cross-sectional view of the display panel in one embodiment of the present disclosure;

[0029] Figure 4 This is a schematic cross-sectional view of the display panel in another embodiment of the present disclosure;

[0030] Figure 5 This is a schematic diagram of a display panel structure according to an embodiment of the present disclosure;

[0031] Figure 6 This is a schematic diagram of the current flow direction in the display panel according to one embodiment of the present disclosure;

[0032] Figure 7 This is a top view of a display panel in related technologies;

[0033] Figure 8 This is a top view of the display panel in one embodiment of the present disclosure;

[0034] Figure 9 This is a lifetime diagram of an OLED device according to an embodiment of the present disclosure and related technologies.

[0035] Explanation of reference numerals in the attached figures:

[0036] 100. Base;

[0037] 200, pixel-limited layer;

[0038] 300, First color subpixel;

[0039] 310. First color, first light-emitting structure layer; 320. First charge generation layer; 330. First color, second light-emitting structure layer;

[0040] 330a, Part One; 330b, Part Two;

[0041] 331. Second electron injection layer; 332. Second electron transport layer; 333. Second hole blocking layer; 334. Second RPMime layer; 335. Second hole transport layer;

[0042] 311. First electron transport layer; 312. First hole blocking layer; 313. First R Prime layer; 314. First hole transport layer; 315. First hole injection layer;

[0043] 321. P-type charge generation layer; 322. N-type charge generation layer;

[0044] 400, Second color subpixel;

[0045] 410. Second color first light-emitting structure layer; 420. Second charge generation layer; 430. Second color second light-emitting structure layer;

[0046] 500, First electrode layer;

[0047] 600, Second electrode layer; Detailed Implementation

[0048] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this disclosure, and different embodiments can be combined arbitrarily without conflict. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0049] Figure 1 This is a cross-sectional schematic diagram of a display panel in one embodiment of a related technology. For example... Figure 1 As shown, the display panel includes a substrate 100, a pixel defining layer 200, and a first color sub-pixel 300. The pixel defining layer 200 is located on one side of the substrate 100 and has an opening area. The first color sub-pixel 300 is defined by a corresponding opening area. The first color sub-pixel 300 includes a first color first light-emitting structure layer 310, a first charge-generating layer 320, and a first color second light-emitting structure layer 330 sequentially disposed on the side of the substrate 100 where the pixel defining layer 200 is formed. The orthographic projections of the first color first light-emitting structure layer 310 and the first color second light-emitting structure layer 330 onto the substrate 100 are within the orthographic projection range of the first charge-generating layer 320 onto the substrate 100. During the fabrication of the first color first light-emitting structure layer 310 and the first color second light-emitting structure layer 330, due to process reasons, the first color first light-emitting structure layer 310 and the first color second light-emitting structure layer 330 diffuse outwards and inwards unevenly, forming an edge region above the pixel limiting layer 200. The width of the edge region is 1-4 micrometers. The portion of the first color first light-emitting structure layer 310 and the first color second light-emitting structure layer 330 located on the upper surface of the pixel limiting layer 200 is 0.3-0.8 times the width of the pixel limiting layer 200. The light-emitting coverage area of ​​the first color sub-pixel 300 accounts for 10%-30% of the overall display panel. The vapor deposition area of ​​the first color first light-emitting structure layer 310 and the first color second light-emitting structure layer 330 is about 600-1200 square micrometers, the effective light-emitting area is about 100-500 square micrometers, and the ratio of the effective utilization area to the vapor deposition area is 20%-40%.

[0050] In related technologies, the orthographic projection of the first color first light-emitting structure layer 310 on the substrate 100 and the orthographic projection of the first color second light-emitting structure layer 330 on the substrate 100 overlap. That is, the boundaries on both sides of the first color first light-emitting structure layer 310 coincide with the boundary ranges on both sides of the first color second light-emitting structure layer 330. The crosstalk lateral current generated by the first charge generation layer 320 cannot be effectively utilized, and the crosstalk lateral current will affect the operation of adjacent pixels and affect the display effect.

[0051] For example, the first color first light-emitting structure layer 310 and the first color second light-emitting structure layer 330 of the first color sub-pixel 300 do not overlap with the light-emitting structure layer of the adjacent second color sub-pixel, such as... Figure 1 As shown. Alternatively, the first color first light-emitting structure layer 310 and the first color second light-emitting structure layer 330 of the first color sub-pixel 300 overlap with the light-emitting structure layer of the adjacent second color sub-pixel, as shown. Figure 2 As shown.

[0052] In related technologies, color temperature can create different atmospheres and influence emotions. For example, low color temperature red light can give people a warm and relaxing feeling, suitable for creating a home environment, while high color temperature blue light can make people feel energetic, suitable for an office environment. It is necessary to provide the most suitable color temperature for different occasions or times to achieve high-quality display. However, there is a problem that prolonged use in a certain color temperature environment can cause individual pixels to age rapidly, thereby reducing the lifespan of the device.

[0053] Figure 3 This is a cross-sectional schematic diagram of the display panel according to one embodiment of the present disclosure. Figure 4 This is a schematic diagram of the display panel structure in another embodiment of the present disclosure. Figure 5 This is a schematic diagram of a display panel structure according to an embodiment of the present disclosure. This disclosure provides a display panel, as shown below. Figure 3 , Figure 4 as well as Figure 5 As shown, the display panel includes a substrate 100, a pixel defining layer 200, and a first color sub-pixel 300. The pixel defining layer 200 is located on one side of the substrate 100 and has an opening area. The first color sub-pixel 300 is defined by a corresponding opening area and includes a first color first light-emitting structure layer 310, a first charge generating layer 320, and a first color second light-emitting structure layer 330 sequentially disposed on the side of the substrate 100 where the pixel defining layer 200 is formed. The orthographic projections of the first color first light-emitting structure layer 310 and the first color second light-emitting structure layer 330 onto the substrate 100 are both within the orthographic projection range of the first charge generating layer 320 onto the substrate 100.

[0054] The first color second light-emitting structure layer 330 includes a first part 330a and a second part 330b. The orthographic projection of the first part 330a on the substrate 100 overlaps with the orthographic projection of the first color first light-emitting structure layer 310 on the substrate 100. The orthographic projection of the second part 330b on the substrate 100 is located outside the orthographic projection of the first color first light-emitting structure layer 310 on the substrate 100. When both the first color first light-emitting structure layer 310 and the first part 330a emit light, the second part 330b emits light under the action of the transverse current in the first charge generating layer 320.

[0055] It should be noted that, to distinguish them from other first and second light-emitting structural layers, the first light-emitting structural layer in the first color sub-pixel 300 is called the first color first light-emitting structural layer, and the second light-emitting structural layer in the first color sub-pixel 300 is called the first color second light-emitting structural layer. Here, "first color" refers to the color displayed by the first color sub-pixel 300. For example, the first color first light-emitting structural layer and the first color second light-emitting structural layer can directly emit light of the first color, or they can emit light of other colors, such as white light, which, after passing through the color filter, displays light of the first color. The first color first light-emitting structural layer 310 and the first color second light-emitting layer 330 can emit different colors of light; for example, the first color first light-emitting layer 310 can emit red light, and the first color second light-emitting layer 330 can emit blue light. Alternatively, the first color first light-emitting structure layer 310 and the first color second light-emitting structure layer 330 can emit light of the same color. For example, the first color first light-emitting structure layer 310 and the first color second light-emitting structure layer 330 can both emit red light, and the first color first light-emitting structure layer 310 and the first color second light-emitting structure layer 330 can both emit blue light.

[0056] The vapor deposition area of ​​the first color first light-emitting structure layer 310 is smaller than the vapor deposition area of ​​the first color second light-emitting structure layer 330. The orthographic projection of the first portion 330a on the substrate 100 overlaps with the orthographic projection of the first color first light-emitting structure layer 310 on the substrate 100. The first portion 330a is located on the side of the first charge generating layer 320 away from the substrate 100, and the first color first light-emitting structure layer 310 is located on the side of the first charge generating layer 320 closer to the substrate 100. The boundary of the first portion 330a and the boundary of the first color first light-emitting structure layer 310 have the same range. The first portion 330a and the first color first light-emitting structure layer 310 can emit light by providing current through an external electrode. Figure 3 As shown, the left and right sides of the first part 330a and the left and right sides of the first color first light-emitting structure layer 310 have the same range, and the first part 330a and the first color first light-emitting structure layer 310 form a stacked light-emitting device.

[0057] The orthographic projection of the second portion 330b on the substrate 100 lies outside the orthographic projection of the first color first light-emitting structure layer 310 on the substrate 100. It should be noted that the second portion 330b and the first portion 330a are formed through a single patterning process. The boundary of the second portion 330b is adjacent to the boundary of the first portion 330a, and the second portion 330b extends in a direction away from the first portion 330a. The second portion 330b is a single-layer light-emitting device. The turn-on voltage of the stacked device formed by the first portion 330a and the first color first light-emitting structure layer 310 is higher than the turn-on voltage of the second portion 330b. Therefore, the lateral current generated in the first charge generation layer 320 is transferred to the second portion 330b, causing the second portion 330b to emit light. The light emitted by the second portion 330b can compensate for the brightness of the stacked device, reduce the power consumption of the device, and extend the device's lifespan. Therefore, the technical solution disclosed herein effectively utilizes crosstalk lateral current to make the second part 330b emit light, which compensates for the brightness of the first color sub-pixel, reduces power consumption, and extends the lifespan of the first color sub-pixel.

[0058] Figure 6 This is a schematic diagram showing the direction of current flow. Figure 6 The direction of the arrow indicates the direction of the current. Ideally, the vertical current illuminates the first color sub-pixel. However, since the first color sub-pixel itself has a certain resistance, the vertical current will be partially shunted, with some current flowing along the first charge generation layer to other pixel locations, creating crosstalk. In this embodiment, by configuring the second part 330b to illuminate using the crosstalk current, the power consumption can be better reduced.

[0059] It should be noted that the second part 330b is located on the surface of the pixel limiting layer on the side away from the substrate 100. The second part 330b can emit light using the crosstalk current of the first charge generation layer 320. The thickness, length and shape of the second part 330b are not limited here and can be set according to actual usage requirements.

[0060] Figure 9 This diagram illustrates the lifespan of OLED devices according to embodiments of the present disclosure and related technologies, where the vertical axis represents the lifespan of the OLED device and the horizontal axis represents the usage time. Figure 9 As shown, after adopting the technical solution of this disclosure embodiment, the lifespan of the OLED device in this disclosure embodiment is significantly higher than that of the OLED device in the related art after the same usage time. Therefore, the technical solution of this disclosure extends the lifespan of the OLED device, thereby improving the lifespan of the display panel.

[0061] In this embodiment of the display panel, the orthographic projection of the first portion 330a on the substrate 100 overlaps with the orthographic projection of the first color first light-emitting structure layer 310 on the substrate 100, forming a stacked light-emitting device. The orthographic projection of the second portion 330b on the substrate 100 is located outside the orthographic projection of the first color first light-emitting structure layer 310 on the substrate 100. The second portion 330b is a single-layer light-emitting device. That is, by setting the evaporation area of ​​the first color second light-emitting structure layer 330 to be larger than the evaporation area of ​​the first color first light-emitting structure layer 310, it is possible to achieve that when both the first color first light-emitting structure layer 310 and the first portion 330a emit light, the second portion 330b emits light under the action of the transverse current in the first charge generation layer 320. The second portion 330b can effectively utilize crosstalk current to emit light, reducing the power consumption of the device itself. Moreover, the process is simple, the practicality is high, it increases the user experience in different color temperature environments, extends the pixel life of the first color sub-pixel, and thus improves the service life of the display panel.

[0062] In one disclosed embodiment, when the first color first light-emitting structure layer 310 is entirely located within the opening region, the portion of the first color second light-emitting structure layer 330 located on the surface of the pixel limiting layer 200 facing away from the substrate 100 is the second portion 330b, and the portion of the first color second light-emitting structure layer 330 located within the opening region is the first portion 330a. When the first color first light-emitting structure layer 310 and the first color second light-emitting structure layer 330 are formed by vapor deposition, the opening of the mask for forming the first color first light-emitting structure layer 310 is smaller than the opening of the mask for forming the first color second light-emitting structure layer 330.

[0063] like Figure 3 As shown, in one disclosed embodiment, when the first color first light-emitting structure layer 310 is located on the surface of the pixel limiting layer 200 on the side opposite to the substrate 100, the portion of the first color second light-emitting structure layer 330 on the pixel limiting layer 200 is larger than the portion of the first color first light-emitting structure layer 310 on the pixel limiting layer 200, that is, the portion of the first color second light-emitting structure layer 330 outside the boundary of the first color first light-emitting structure layer 310 is the second portion 330b.

[0064] Figure 7 This is a top view of the first color second light-emitting structure layer of a display panel in related technologies, such as... Figure 7 As shown, the solid line represents the actual vapor deposition area, and the dashed line represents the actual light-emitting area. The vapor deposition area of ​​the first color second light-emitting structure layer 330 is approximately 600-1200 square micrometers, and the effective light-emitting area is approximately 100-500 square micrometers. The coverage area of ​​the first color second light-emitting structure layer accounts for 10%-30% of the entire display panel area.

[0065] Figure 8 This is a top view of the first color second light-emitting structure layer of the display panel in one embodiment of the present disclosure, as shown below. Figure 8 As shown, the solid line represents the vapor deposition area, and the dashed line represents the effective light-emitting area. The vapor deposition area of ​​the first color second light-emitting structure layer 330 is approximately 600-2000 square micrometers, and the effective light-emitting area is approximately 100-500 square micrometers. The auxiliary light-emitting area of ​​the first color second light-emitting structure layer 310 on the pixel limiting layer 200 is 500-1900 square micrometers. The coverage area of ​​the first color second light-emitting structure layer accounts for 55%-85% of the entire display panel area. For example, the first color second light-emitting structure layer 330 is a red light structure. Therefore, the display panel of this embodiment significantly improves the red light coverage area. Of course, the first color second light-emitting structure layer can also be a blue light structure or a green light structure.

[0066] In some embodiments, the second portion 330b is located on the surface of the pixel defining layer 200 on the side opposite to the substrate 100, and the second portion 330b is disposed around the outer periphery of the first portion 330a. The second portion 330b complements the first portion 330a by utilizing crosstalk current, reducing device power consumption without affecting the display effect. It should be noted that the specific size of the second portion 330b is not limited here. The second portion 330b is disposed around the outer periphery of the first portion 330a, and the shapes of the first portion 330a and the second portion 330b can be regular shapes, such as rectangles or circles, or they can be irregular shapes.

[0067] In some embodiments, the second portion 330b is connected to the boundary of the opening area adjacent to the opening area defining the first color sub-pixel 300. One end of the second portion 330b is connected to the first portion 330a, and the maximum range of the end of the second portion 330b away from the first portion 330a is connected to the boundary of the opening area adjacent to the opening area defining the first color sub-pixel 300, thereby preventing the second portion 330b from affecting the pixels in the adjacent opening area.

[0068] For example, the pixel defining layer 200 may be formed of an inorganic or organic insulating material, such as acrylic, polyimide, methyl methacrylate, etc., commonly used in the art. The pixel defining layer 200 forms a plurality of opening regions for defining sub-pixels.

[0069] In some embodiments, the first charge generation layer 320 and the second charge generation layer 420 include an N-type charge generation layer and a P-type charge generation layer stacked together, both of which are doped layers. The N-type charge generation layer is close to the first color first light-emitting structure layer 310, and the host material of the N-type charge generation layer and the guest material of the first electron transport layer are the same general-purpose material.

[0070] In one disclosed embodiment, the first charge generating layer 320 and the second charge generating layer 420 are located in the same layer. It should be noted that the first charge generating layer 320 and the second charge generating layer 420 being located in the same layer can be understood as the first charge generating layer 320 and the second charge generating layer 420 being formed through the same patterning process. Alternatively, it can be understood as the first charge generating layer 320 being located on the surface of the first color first light-emitting structure layer 310 facing away from the substrate 100, and the second charge generating layer 420 being located on the surface of the second color first light-emitting structure layer 410 facing away from the substrate 100, i.e., the first charge generating layer 320 and the second charge generating layer 420 being located on the same side of the surface. Alternatively, it can be understood that the first charge generating layer 320 and the second charge generating layer 420 are an integral structure.

[0071] In some of the disclosed embodiments, the first color subpixel 300 can be used to generate a specific color temperature environment. It should be noted that the human eye requires dark adaptation; that is, when the human eye enters different lighting conditions, a certain adaptation process is needed. For example, entering the dark environment of a movie theater can cause a temporary visual impact, and it takes a relatively long time to fully adapt. Human visual cells are least sensitive to red light, and the human eye can adapt quickly to a red light environment. Therefore, the first color subpixel 300 helps improve the user experience in different color temperature environments. The second part 330b and the first part 330a of the first color second luminescent structure layer of the first color subpixel 300 are complementary, which can effectively solve the problem of excessive attenuation of the first color subpixel during use, improve the lifespan of the device, and simplify the manufacturing process.

[0072] In some of the disclosed embodiments, the first color sub-pixel 300 further includes at least one of an electron injection layer, an electron transport layer, a hole injection layer, and a hole transport layer.

[0073] For example, the first color subpixel 300 is a red subpixel, and the first color subpixel 300 can be used to form a specific red color temperature environment. (See reference...) Figure 5As shown, the first color sub-pixel 300 includes, from top to bottom, a second electron injection layer 331, a second electron transport layer 332, a second hole blocking layer 333, a first color second light-emitting structure layer 330, a second R Prime layer 334 (second auxiliary layer), a second hole transport layer 335, a P-type charge generation layer 321, an N-type charge generation layer 322, a first electron transport layer 311, a first hole blocking layer 312, a first color first light-emitting structure layer 310, a first R Prime layer 313 (first auxiliary layer), a first hole transport layer 314, and a first hole injection layer 315. The orthographic projections of the first color second light-emitting structure layer 330 and the second R Prime layer 334 onto the substrate overlap, and the orthographic projections of the first color first light-emitting structure layer 310 and the first R Prime layer 313 onto the substrate also overlap.

[0074] It should be noted that both the first electron transport layer 311 and the second electron transport layer 332 are binary doped structures, and the main materials of the first electron transport layer 311 and the second electron transport layer 332 can be the same material or different materials.

[0075] It should be noted that the first color sub-pixel 300 can also be a green sub-pixel or a blue sub-pixel. The specific structure of the first color sub-pixel 300 can be referred to the above description of the first color sub-pixel being a red sub-pixel, and will not be repeated here.

[0076] It should be noted that the first color first light-emitting structure layer 310 and the first color second light-emitting structure layer 330 include a main material and an object material. The main material can be the same or different materials, and the object material can also be the same or different materials.

[0077] It should be noted that the specific color of the first color subpixel 300 is not limited here. Different color temperatures can be set according to actual usage requirements to meet different needs. For example, in different usage scenarios, the first color subpixel 300 can be a blue subpixel, or the first color subpixel 300 can be a green subpixel.

[0078] Reference Figure 3 and Figure 5 As shown, in some of the disclosed embodiments, the display panel further includes a first electrode layer 500 and a second electrode layer 600. The first electrode layer 500 is located in the opening area, the first color first light-emitting structure layer 310 is located on the side of the first electrode layer 500 away from the substrate 100, and the second electrode layer 600 is located on the side of the first color second light-emitting structure layer 330 away from the substrate 100.

[0079] Exemplarily, the first electrode layer 500 can be an anode, used to provide hole carriers. The first electrode layer 500 can be a transparent electrode layer, formed using a transparent conductive material, such as indium tin oxide (ITO), zinc tin oxide (ZTO), zinc oxide, indium zinc oxide (IZO), gallium indium zinc oxide (GIZO), etc. The first electrode layer 500 can also be a composite layer including a transparent conductive material layer and a metal layer, such as an ITO / Ag / ITO composite layer. In other exemplary embodiments, the first electrode layer can also be made of an opaque material. The second electrode layer 600 can be a cathode, used to provide electron carriers. The second electrode layer 600 can be formed using a transparent material or a metal. The transparent conductive material can include ITO, IZO, ZTO, GIZO, etc. The metal can include, for example, Ag, Al, Pt, Au, Cr, etc., or alloys of these materials.

[0080] It should be noted that the first electrode layer 500 can also be a cathode, and the second electrode layer 600 can be an anode.

[0081] Reference Figure 3 and Figure 4 As shown, in some of the disclosed embodiments, a display panel further includes a second color sub-pixel 400 disposed adjacent to the first color sub-pixel 300. The second color sub-pixel 400 is defined by an opening adjacent to the opening area of ​​the first color sub-pixel 300. The second color sub-pixel 400 includes a second color first light-emitting structure layer 410, a second charge-generating layer 420, and a second color second light-emitting structure layer 430 sequentially disposed on the side of the substrate 100 where the pixel defining layer 200 is formed. The orthographic projections of the second color first light-emitting structure layer 410 and the second color second light-emitting structure layer 420 on the substrate 100 are both located within the orthographic projection range of the second charge-generating layer 420 on the substrate 100. The orthographic projections of the second color first light-emitting structure layer 410 and the second color second light-emitting structure layer 430 on the substrate 100 overlap, that is, the second color sub-pixel 400 is a stacked light-emitting device. The area of ​​the portion of the first-color second-emissive structure layer 330 on the surface of the pixel limiting layer 200 facing away from the substrate 100 is larger than the area of ​​the portion of the second-color second-emissive structure layer 430 on the surface of the pixel limiting layer 200 facing away from the substrate 100. That is, the area of ​​the first-color second-emissive structure layer 330 is larger than that of the second-color second-emissive structure layer 430, thereby increasing the coverage area of ​​the first-color sub-pixel.

[0082] For example, when the first color sub-pixel 300 is a red sub-pixel and the second color sub-pixel 400 is a green sub-pixel, the area of ​​the red sub-pixel portion is larger than the area of ​​the green sub-pixel portion.

[0083] For example, refer to Figure 4 The portion of the first color second light-emitting structure layer 330 located on the side of the pixel limiting layer 200 away from the substrate 100 includes a first structure portion and a second structure portion. The second structure portion overlaps the surface of the second color second light-emitting structure layer 430 on the side away from the substrate 100. The orthogonal projection area of ​​the first structure portion on the substrate 100 is smaller than the orthogonal projection area of ​​the second structure portion on the substrate 100. The light-emitting coverage area of ​​the first color sub-pixel reaches 45%-75%.

[0084] For example, refer to Figure 3 The portion of the first color second light-emitting structure layer 330 located on the side of the pixel limiting layer 200 away from the substrate 100 includes a first structure portion and a second structure portion. The second structure portion overlaps the surface of the second color light-emitting structure layer 430 on the side away from the substrate 100. The orthogonal projection area of ​​the first structure portion on the substrate 100 is larger than the orthogonal projection area of ​​the second structure portion on the substrate 100. The light-emitting coverage area of ​​the first color light-emitting sub-pixel reaches 55%-85%.

[0085] Reference Figure 3 In some of these embodiments, the orthographic projection of the first color first light-emitting structure layer 310 on the substrate 100 and the orthographic projection of the second color first light-emitting structure layer 410 on the substrate 100 do not overlap, that is, there is no overlap between the first color first light-emitting structure layer 310 and the second color first light-emitting structure layer 410.

[0086] Reference Figure 4 For example, at least a portion of the first color first light-emitting structure layer 310 on the surface of the pixel defining layer 200 facing away from the substrate 100 overlaps with the surface of the second color first light-emitting structure layer 410 facing away from the substrate 100, that is, the first color first light-emitting structure layer 310 and the second color first light-emitting structure layer 410 are partially overlapped.

[0087] This disclosure also provides a method for fabricating a display panel, comprising: providing a substrate; forming a pixel defining layer on one side of the substrate, the pixel defining layer having an opening region; forming a first color sub-pixel on the side of the substrate where the pixel defining layer is formed, defined by a corresponding opening region, the first color sub-pixel including a first color first light-emitting structure layer, a first charge-generating layer and a first color second light-emitting structure layer sequentially disposed on the side of the substrate where the pixel defining layer is formed, the orthogonal projections of the first color first light-emitting structure layer and the first color second light-emitting structure layer on the substrate are both located within the orthogonal projection range of the first charge-generating layer on the substrate, the first color second light-emitting structure layer includes a first part and a second part, the orthogonal projection of the first part on the substrate overlaps with the orthogonal projection of the first color first light-emitting structure layer on the substrate, the orthogonal projection of the second part on the substrate is located outside the orthogonal projection of the first color first light-emitting structure layer on the substrate, when both the first color first light-emitting structure layer and the first part emit light, the second part emits light under the action of a transverse current in the first charge-generating layer.

[0088] The technical solution of this disclosure is further illustrated below through the fabrication process of a display panel in one embodiment. It is understood that the term "patterning" as used herein includes processes such as photoresist coating, mask exposure, development, etching, and photoresist stripping when the patterning material is inorganic or metallic; and processes such as mask exposure and development when the patterning material is organic. Evaporation, deposition, coating, and plating are all mature fabrication processes in related technologies.

[0089] A pixel defining layer 200 is formed on one side of the substrate 100, and the pixel defining layer 200 has an opening area. The specific steps are as follows: The pixel defining layer 200 is formed on one side of the substrate 100 by a patterning process.

[0090] A first color sub-pixel 300 is formed on one side of the substrate 100 where the pixel defining layer 200 is formed, and the first color sub-pixel is defined by a corresponding opening area. The specific steps are as follows: Exemplarily, a first color first light-emitting structure layer 310 is formed in the corresponding opening area of ​​the substrate 100 using a patterning process. The first color first light-emitting structure layer 310 can be formed using a first mask. A first charge-generating layer 320 is formed on the surface of the first color light-emitting structure layer 310 facing away from the substrate 100 using a patterning process. A first color second light-emitting structure layer 330 is formed on the surface of the first charge-generating layer 320 facing away from the substrate 100 using a patterning process. The first color second light-emitting structure layer 330 can be formed using a second mask, and the opening of the second mask is larger than the opening of the first mask. The display panel fabrication method in this embodiment has a simple fabrication process and high practicality.

[0091] Based on the inventive concept of the foregoing embodiments, this disclosure also provides a display device, which includes the display panel in any embodiment of this disclosure. The display device can be any product or component with display functionality, such as a mobile phone, tablet computer, television, monitor, laptop computer, digital photo frame, or navigator.

[0092] Other configurations of the display panel and display device in the above embodiments can be derived from various technical solutions now and in the future known to those skilled in the art, and will not be described in detail here.

[0093] In the description of this specification, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure.

[0094] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this disclosure, "multiple" means two or more, unless otherwise explicitly specified.

[0095] In this disclosure, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0096] In this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0097] The foregoing disclosure provides many different implementations or examples for carrying out different structures of this disclosure. To simplify this disclosure, the components and arrangements of specific examples are described above. Of course, these are merely examples and are not intended to limit this disclosure. Furthermore, reference numerals and / or reference letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various implementations and / or arrangements discussed.

[0098] The above are merely specific embodiments of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in this disclosure, and these should all be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. A display panel, characterized in that, include: Base; A pixel defining layer is located on one side of the substrate, and the pixel defining layer has an opening region; The first color sub-pixel, defined by the corresponding opening region, includes a first color first light-emitting structure layer, a first charge-generating layer, and a first color second light-emitting structure layer sequentially disposed on the side of the substrate where the pixel defining layer is formed. The orthographic projections of the first color first light-emitting structure layer and the first color second light-emitting structure layer on the substrate are both located within the orthographic projection range of the first charge-generating layer on the substrate. The first color second light-emitting structure layer includes a first part and a second part. The orthographic projection of the first part on the substrate overlaps with the orthographic projection of the first color first light-emitting structure layer on the substrate. The orthographic projection of the second part on the substrate is located outside the orthographic projection of the first color first light-emitting structure layer on the substrate. When both the first color first light-emitting structure layer and the first part emit light, the second part emits light under the action of a transverse current in the first charge-generating layer. The second part is disposed around the first part. The second color sub-pixel is disposed adjacent to the first color sub-pixel. The second color sub-pixel includes a second color first light-emitting structure layer, a second charge-generating layer, and a second color second light-emitting structure layer sequentially disposed on the side of the substrate where the pixel limiting layer is formed. The orthographic projections of the second color first light-emitting structure layer and the second color second light-emitting structure layer on the substrate are both located within the orthographic projection range of the second charge-generating layer on the substrate. The area of ​​the first color second light-emitting structure layer located on the surface of the pixel limiting layer facing away from the substrate is greater than the area of ​​the second color second light-emitting structure layer located on the surface of the pixel limiting layer facing away from the substrate. Wherein, at least a portion of the first color first light-emitting structure layer on the surface of the pixel defining layer facing away from the substrate overlaps with the surface of the second color first light-emitting structure layer facing away from the substrate.

2. The display panel according to claim 1, characterized in that, The second part is adjacent to the boundary of the opening area that defines the opening area of ​​the first color sub-pixel.

3. The display panel according to claim 1, characterized in that, The portion of the first color second light-emitting structure layer located on the side of the pixel defining layer away from the substrate includes a first structure portion and a second structure portion. The second structure portion overlaps on the side of the second color second light-emitting structure layer away from the substrate. The orthogonal projection area of ​​the first structure portion on the substrate is smaller than the orthogonal projection area of ​​the second structure portion on the substrate.

4. The display panel according to claim 1, characterized in that, The portion of the first color second light-emitting structure layer located on the side of the pixel defining layer away from the substrate includes a first structural portion and a second structural portion. The second structural portion overlaps on the side of the second color second light-emitting structure layer away from the substrate. The orthogonal projection area of ​​the first structural portion on the substrate is larger than the orthogonal projection area of ​​the second structural portion on the substrate.

5. The display panel according to claim 1, characterized in that, The orthographic projection of the first color first luminescent structure layer on the substrate and the orthographic projection of the second color first luminescent structure layer on the substrate do not overlap.

6. The display panel according to claim 1, characterized in that, The first color sub-pixel is a red sub-pixel, and the second color sub-pixel is either a blue sub-pixel or a green sub-pixel.

7. The display panel according to claim 1, characterized in that, The first charge generation layer and the second charge generation layer are located in the same layer.

8. The display panel according to claim 1, characterized in that, The first charge generation layer and the second charge generation layer include an N-type charge generation layer and a P-type charge generation layer, both of which are doped layers.

9. The display panel according to any one of claims 1 to 8, characterized in that, The first color sub-pixel further includes at least one of an electron injection layer, an electron transport layer, a hole injection layer, and a hole transport layer.

10. The display panel according to any one of claims 1 to 8, characterized in that, The display panel further includes a first electrode layer and a second electrode layer. The first electrode layer is located in the opening area, the first color first light-emitting structure layer is located on the side of the first electrode layer away from the substrate, and the second electrode layer is located on the side of the first color second light-emitting structure layer away from the substrate.

11. A method for manufacturing a display panel, characterized in that, The preparation method is used to prepare a display panel as described in any one of claims 1 to 10, the preparation method comprising: Provide a base; A pixel defining layer is formed on one side of the substrate, and the pixel defining layer has an opening region; A first color sub-pixel is formed on one side of the substrate where a pixel defining layer is formed, and is defined by a corresponding opening area. The first color sub-pixel includes a first color first light-emitting structure layer, a first charge-generating layer, and a first color second light-emitting structure layer sequentially disposed on the side of the substrate where the pixel defining layer is formed. The orthographic projections of the first color first light-emitting structure layer and the first color second light-emitting structure layer on the substrate are both located within the orthographic projection range of the first charge-generating layer on the substrate. The first color second light-emitting structure layer includes a first part and a second part. The orthographic projection of the first part on the substrate overlaps with the orthographic projection of the first color first light-emitting structure layer on the substrate. The orthographic projection of the second part on the substrate is located outside the orthographic projection of the first color first light-emitting structure layer on the substrate. When both the first color first light-emitting structure layer and the first part emit light, the second part emits light under the action of a transverse current in the first charge-generating layer. The second part is disposed around the first part.

12. A display device, characterized in that, The display panel includes any one of claims 1-10.

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