Display panel and display device

Abstract

The application discloses a display panel and a display device, and belongs to the technical field of display. The display panel comprises a driving back plate, a first electrode layer, a pixel definition layer, an organic light-emitting layer and a second electrode layer. The pixel definition layer comprises a first definition layer, a second definition layer and a third definition layer which are arranged in a direction perpendicular to and away from the driving back plate in a stacking mode, the side of the first definition layer facing the pixel opening protrudes from the side of the second definition layer facing the pixel opening, and the part of the first definition layer protruding from the second definition layer is a first protruding part; the side of the third definition layer facing the pixel opening protrudes from the side of the second definition layer facing the pixel opening, and the part of the third definition layer protruding from the second definition layer is a second protruding part. The form of the first protruding part located in the first type of pixel opening is different from the form of the first protruding part located in the second type of pixel opening. In this way, the first protruding part can be adapted to different pixel openings, and the overall efficiency of the display panel is improved.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to a display panel and display device. Background Technology

[0002] Organic light-emitting diode (OLED) is a current-driven organic light-emitting device. OLED display panels are widely used in the display field due to their advantages such as thinness, self-illumination, high resolution, and fast response speed.

[0003] OLED display panels generally include a driving backplane and multiple light-emitting devices located on the driving backplane. Each light-emitting device includes a first electrode layer, an organic light-emitting layer, and a second electrode layer stacked along a direction away from the driving backplane. A pixel definition layer is disposed between adjacent light-emitting devices. The pixel definition layer has a recessed structure on the side closest to the light-emitting device to block lateral leakage current. However, the organic light-emitting layer will experience distortion at the recessed structure; therefore, a protrusion needs to be provided on the side of the pixel definition layer closest to the light-emitting device to reduce distortion.

[0004] However, different types of light-emitting devices have different performance. Setting the same protrusion will cause some light-emitting devices to have lower luminous efficiency, resulting in a lower overall efficiency of the OLED display panel. Summary of the Invention

[0005] This application provides a display panel and a display device, which can solve the problem of low overall efficiency of display panels. The technical solution is as follows:

[0006] On the one hand, a display panel is provided, including: a driving backplane, a first electrode layer, a pixel definition layer, an organic light-emitting layer, and a second electrode layer;

[0007] The first electrode layer is located on one side of the drive back plate, and the first electrode layer has a plurality of separately disposed first electrodes, which are electrically connected to the drive back plate.

[0008] The pixel definition layer is located on the side of the first electrode layer opposite to the driving backplate. The pixel definition layer has multiple pixel openings, including multiple first-type pixel openings and multiple second-type pixel openings.

[0009] The organic light-emitting layer is located on the side of the pixel definition layer opposite to the driving backplate;

[0010] The second electrode layer is located on the side of the organic light-emitting layer opposite to the driving backplate;

[0011] The pixel definition layer includes a first definition layer, a second definition layer, and a third definition layer stacked along a direction perpendicular to and away from the driving backplate, wherein the pixel opening passes through the first definition layer, the second definition layer, and the third definition layer in sequence;

[0012] The first defining layer protrudes from the side of the second defining layer facing the pixel opening, and the portion of the first defining layer protruding from the second defining layer is a first protrusion; the third defining layer protrudes from the side of the second defining layer facing the pixel opening, and the portion of the third defining layer protruding from the second defining layer is a second protrusion.

[0013] The shape of the first protrusion located within the first type of pixel opening is different from the shape of the first protrusion located within the second type of pixel opening.

[0014] Optionally, the length by which the first protrusion within the first type of pixel opening protrudes beyond the second defining layer is greater than the length by which the first protrusion within the second type of pixel opening protrudes beyond the second defining layer.

[0015] Optionally, for the first protrusion and the second protrusion located within the first type of pixel opening, the side of the first protrusion facing the first type of pixel opening protrudes beyond the side of the second protrusion facing the first type of pixel opening.

[0016] For the first protrusion and the second protrusion located within the second type of pixel opening, the side of the first protrusion facing the second type of pixel opening is flush with the side of the second protrusion facing the second type of pixel opening.

[0017] Optionally, for the first protrusion and the second protrusion located within the first type of pixel opening, the first protrusion protrudes from the side facing the first type of pixel opening and from the side facing the first type of pixel opening, and the length of the first protrusion protruding from the second protrusion is a first length.

[0018] For the first protrusion and the second protrusion located within the second type of pixel opening, the first protrusion protrudes from the side facing the second type of pixel opening and from the side facing the second type of pixel opening, and the length by which the first protrusion protrudes from the second protrusion is the second length.

[0019] Wherein, the first length is greater than the second length.

[0020] Optionally, the first length ranges from 0.01 micrometers to 0.02 micrometers, and the second length ranges from less than or equal to 0.01 micrometers.

[0021] Optionally, the height of the first protrusion located within the first type of pixel opening in the direction perpendicular to the driving backplate is equal to the height of the first protrusion located within the second type of pixel opening in the direction perpendicular to the driving backplate.

[0022] Optionally, the height of the first protrusion located within the first type of pixel opening in the direction perpendicular to the driving backplate is less than the height of the first protrusion located within the second type of pixel opening in the direction perpendicular to the driving backplate.

[0023] Optionally, the height of the first protrusion located within the first type of pixel opening in the direction perpendicular to the driving backplate is less than or equal to 350 angstroms, and the height of the first protrusion located within the second type of pixel opening in the direction perpendicular to the driving backplate is 400 angstroms to 500 angstroms.

[0024] Optionally, the length by which the first protrusion within the first type of pixel opening protrudes beyond the second defining layer is equal to the length by which the first protrusion within the second type of pixel opening protrudes beyond the second defining layer.

[0025] Optionally, the length by which the first protrusion within the first type of pixel opening protrudes beyond the second defining layer is greater than the length by which the first protrusion within the second type of pixel opening protrudes beyond the second defining layer.

[0026] Furthermore, the height of the first protrusion located within the first type of pixel opening in the direction perpendicular to the driving backplate is less than the height of the first protrusion located within the second type of pixel opening in the direction perpendicular to the driving backplate.

[0027] Optionally, the display panel further includes an encapsulation layer and a color filter layer; the encapsulation layer is located on the side of the second electrode layer opposite to the driving backplate; the color filter layer is located on the side of the encapsulation layer opposite to the driving backplate, and the color filter layer includes: a plurality of color resist blocks corresponding one-to-one with the pixel openings, wherein the orthographic projection of the pixel openings on the driving backplate is located within the orthographic projection of the corresponding color resist blocks on the driving backplate.

[0028] Optionally, the plurality of color resist blocks include a plurality of blue color resist blocks, a plurality of red color resist blocks, and a plurality of green color resist blocks;

[0029] The plurality of first-type pixel openings are all blue pixel openings, and the orthographic projection of the blue pixel openings on the driving back panel is located within the orthographic projection of the blue color resist on the driving back panel; the second-type pixel openings include a plurality of red pixel openings and a plurality of green pixel openings, the orthographic projection of the red pixel openings on the driving back panel is located within the orthographic projection of the red color resist on the driving back panel, and the orthographic projection of the green pixel openings on the driving back panel is located within the orthographic projection of the green color resist on the driving back panel.

[0030] Optionally, the organic light-emitting layer includes a first light-emitting layer, a second light-emitting layer, and a charge-generating layer located between the two;

[0031] The second light-emitting layer is closer to the drive backplate than the first light-emitting layer; and the first light-emitting layer is configured to emit blue light, while the second light-emitting layer is configured to emit yellow light.

[0032] On the other hand, a display device is provided, including a driver chip and a display panel electrically connected to the driver chip, the display panel including any of the display panels described above.

[0033] The beneficial effects of the technical solution provided in this application include at least the following:

[0034] The side of the first defining layer facing the pixel opening protrudes beyond the side of the second defining layer facing the pixel opening, and the side of the third defining layer facing the pixel opening protrudes beyond the side of the second defining layer facing the pixel opening. This creates a concave structure on the sidewall of the pixel defining layer facing the pixel opening, which can isolate at least one layer of the organic light-emitting layer, such as the charge-generating layer, effectively blocking lateral leakage current and ensuring a good display effect for the display panel. Simultaneously, the shape of the first protrusion located within the first type of pixel opening differs from that within the second type of pixel opening, allowing the first protrusion to better adapt to the light-emitting devices within different pixel openings, improving the efficiency of each light-emitting device and resulting in a more balanced luminous efficiency, thereby improving the overall efficiency of the display panel. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This is a schematic diagram of the film layer structure of a display panel provided by related technologies;

[0037] Figure 2 This is a top view of a display panel provided in an embodiment of this application;

[0038] Figure 3 yes Figure 2 The diagram shows the film structure of the display panel at point A-A'.

[0039] Figure 4 yes Figure 2 A schematic diagram of another film layer structure of the display panel at A-A' is shown;

[0040] Figure 5 This is a simulation diagram of a display panel provided in an embodiment of this application;

[0041] Figure 6 This is a simulation diagram of another display panel provided in an embodiment of this application;

[0042] Figure 7 This is a simulation diagram of another display panel provided in the embodiments of this application;

[0043] Figure 8 This is a schematic diagram of the film layer structure of a display panel provided in an embodiment of this application;

[0044] Figure 9 This is a schematic diagram of the film layer structure of another display panel provided in an embodiment of this application;

[0045] Figure 10 This is a schematic diagram of the film layer structure of another display panel provided in an embodiment of this application;

[0046] Figure 11 This is a schematic diagram of the film layer structure of another display panel provided in an embodiment of this application. Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0048] In related technologies, silicon-based OLED display panels generally include a driving backplane and multiple light-emitting devices located on the driving backplane. The light-emitting devices may include a first electrode layer, an organic light-emitting layer, and a second electrode layer stacked along a direction away from the driving backplane. The organic light-emitting layer may consist of multiple stacked sub-light-emitting layers, each of which may include a stacked hole injection layer, a hole transport layer, a light-emitting material layer, an electron transport layer, and an electron injection layer. These sub-light-emitting layers can be connected in series via charge generation layers. Thus, the color of the light emitted by the organic light-emitting layer can be determined by the multiple sub-light-emitting layers. For example, sub-light-emitting layers capable of emitting yellow light and blue light can be stacked to make the organic light-emitting layer emit white light.

[0049] The first electrode layer can be electrically connected to the driving backplane. When a corresponding voltage is applied to the first and second electrode layers, an electric field is formed between them. Thus, the hole injection layer can inject holes into the hole transport layer, which then transports them to the light-emitting material layer. Similarly, the electron injection layer can inject electrons into the electron transport layer, which then transports them to the light-emitting material layer. Holes and electrons combine within the light-emitting material layer to form high-energy excitons. These high-energy excitons are unstable and easily transition to low-energy excitons, releasing energy and generating photons to emit light within a specific wavelength range. When the organic light-emitting layer consists of multiple sub-light-emitting layers, the charge-generating layer used to connect these sub-light-emitting layers is typically made of a material with good conductivity to ensure that each sub-light-emitting layer can emit light, thereby improving the luminescence effect of the organic light-emitting layer.

[0050] Since the organic light-emitting layers in light-emitting devices are uniformly deposited using a vapor deposition process, the sub-light-emitting layers and charge-generating layers in each device are connected together. Because the charge-generating layer has good conductivity, during the emission of light from a particular device, its charge-generating layer may generate lateral leakage current, causing adjacent devices to emit light. Therefore, a pixel definition layer needs to be set between adjacent devices. A concave structure is created on the side of the pixel definition layer near the light-emitting device to isolate the charge-generating layer, thereby preventing lateral leakage current. However, during the formation of the organic light-emitting layer, significant distortion occurs near the concave structure of the pixel definition layer. The internal resistance of the organic light-emitting layer at the distortion point decreases, causing current to flow through the distorted organic light-emitting layer first, resulting in severe leakage.

[0051] Please refer to Figure 1To reduce distortion, the display panel in the related technology has a protrusion 034 on the side of the pixel definition layer 03 facing the light-emitting device 02. The pixel definition layer 03 may include a first definition layer 031, a second definition layer 032, and a third definition layer 033 stacked along a direction perpendicular to and away from the driving backplane. The side of the first definition layer 031 facing the light-emitting device 02 protrudes beyond the side of the second definition layer 032 facing the light-emitting device 02, and the side of the third definition layer 033 facing the light-emitting device 02 also protrudes beyond the side of the second definition layer 032 facing the light-emitting device 02, thereby forming a concave structure on the sidewall of the pixel definition layer 03. This concave structure can effectively isolate lateral leakage current.

[0052] like Figure 1 As shown, the side of the first defining layer 031 facing the light-emitting device 02 also protrudes from the side of the third defining layer 033 facing the light-emitting device 02. Here, the portion of the first defining layer 031 that protrudes from the second defining layer 032 can be a protrusion 034, that is, the side of the protrusion 034 facing the light-emitting device 02 protrudes from the side of the third defining layer 033 facing the light-emitting device 02. Thus, during the formation of the light-emitting device 02, the presence of the protrusion 034 makes the formed organic light-emitting layer smoother, thereby reducing the distortion of the organic light-emitting layer and thus reducing the occurrence of leakage current.

[0053] Typically, the light-emitting side of the display panel also has multiple color resist blocks corresponding one-to-one with multiple light-emitting devices 02. The orthographic projection of each light-emitting device 02 on the driving backplate 01 can be located within the orthographic projection of the corresponding color resist block on the driving backplate. Here, the multiple light-emitting devices 02 can be divided into several different types according to the different colors of the color resist blocks. For example, when the color resist block is red, the light-emitting device 02 corresponding to the red color resist block can be a red light-emitting device, and the white light emitted by the red light-emitting device can be emitted as red light after being filtered by the red color resist block; when the color resist block is green, the light-emitting device 02 corresponding to the green color resist block can be a green light-emitting device, and the white light emitted by the green light-emitting device can be emitted as green light after being filtered by the green color resist block; when the color resist block is blue, the light-emitting device 02 corresponding to the blue color resist block can be a blue light-emitting device, and the white light emitted by the blue light-emitting device can be emitted as blue light after being filtered by the green color resist block.

[0054] However, in related technologies, the protrusions 034 corresponding to different types of light-emitting devices have the same shape. This may result in the protrusions 034 being able to adapt to only one specific type of light-emitting device, but not to other types of light-emitting devices. This may lead to low luminous efficiency of some light-emitting devices in the display panel, which in turn leads to low overall efficiency of the display panel.

[0055] This application provides a display panel that can solve the problem of low overall efficiency of display panels. Please refer to... Figure 2 and Figure 3 , Figure 2 This is a top view of a display panel provided in an embodiment of this application. Figure 3 yes Figure 2 The diagram shows the film structure of the display panel at point A-A'. The display panel 000 may include: a driving backplate 100, a first electrode layer 200, a pixel definition layer 300, an organic light-emitting layer 400, and a second electrode layer 500.

[0056] The first electrode layer 200 may be located on one side of the drive backplate 100. The first electrode layer 200 may have a plurality of separately disposed first electrodes 201, and the plurality of first electrodes 201 may be electrically connected to the drive backplate 100.

[0057] The pixel definition layer 300 can be located on the side of the first electrode layer 200 away from the driving backplate 100. The pixel definition layer 300 can have multiple pixel openings, which penetrate the pixel definition layer 300 in a direction perpendicular to and away from the driving backplate 100. The multiple pixel openings can correspond one-to-one with the multiple first electrodes 201 in the first electrode layer 200, and the orthographic projection of the pixel opening on the driving backplate 100 can be located within the orthographic projection of the corresponding first electrode 201 on the driving backplate 100. That is, the middle part of the first electrode 201 can be exposed in the pixel opening, while the edge part can be covered by the pixel definition layer 300, thereby preventing tip discharge at the edge.

[0058] The organic light-emitting layer 400 may include multiple sub-light-emitting layers stacked together, with adjacent sub-light-emitting layers connected in series via charge generation layers. The organic light-emitting layer 400 may be fabricated using a full-layer vapor deposition process; that is, the sub-light-emitting layers are entirely connected, and the charge generation layers are also entirely connected. The organic light-emitting layer 400 may be located on the side of the pixel definition layer 300 opposite to the driving backplane 100. Since the pixel definition layer 300 has multiple pixel openings, a portion of the organic light-emitting layer 400 may be located within these pixel openings, and the organic light-emitting layer 400 located within the pixel openings may be in contact with the first electrode 201.

[0059] The second electrode layer 500 can be located on the side of the organic light-emitting layer 400 away from the driving backplate 100, that is, the organic light-emitting layer 400 can also be in contact with the second electrode layer 500. In other words, the organic light-emitting layer 400 located within the pixel opening can simultaneously contact the first electrode 201 and the second electrode layer 500. The organic light-emitting layer 400 located within a pixel opening, and the first electrode 201 and the second electrode layer 500 in contact with it, can serve as a light-emitting device. The first electrode 201 can be an anode, and the second electrode layer 500 can be a cathode. When a corresponding voltage is applied to the first electrode 201 and the second electrode layer 500, an electric field is formed between the first electrode 201 and the second electrode layer 500. The organic light-emitting layer 400 located in the electric field can emit light, thereby allowing the display panel 000 to display the corresponding image.

[0060] It should be noted that the pixel definition layer 300 may include a first definition layer 301, a second definition layer 302 and a third definition layer 303 stacked in a direction perpendicular to and away from the driving backplate 100, with the pixel opening passing through the first definition layer 301, the second definition layer 302 and the third definition layer 303 in sequence.

[0061] In this design, the side of the first defining layer 301 facing the pixel opening protrudes beyond the side of the second defining layer 302 facing the pixel opening, and the portion of the first defining layer 301 protruding beyond the second defining layer 302 is the first protrusion L1; the side of the third defining layer 303 facing the pixel opening protrudes beyond the side of the second defining layer 302 facing the pixel opening, and the portion of the third defining layer 303 protruding beyond the second defining layer 302 is the second protrusion L2. Thus, a concave structure is formed on the sidewall of the pixel defining layer 300 facing the pixel opening, which can isolate at least one layer of the organic light-emitting layer 400, such as the charge-generating layer, and can effectively block lateral leakage current.

[0062] Furthermore, the multiple pixel openings may include multiple first-type pixel openings K1 and multiple second-type pixel openings K2. The light-emitting devices located in the first-type pixel openings K1 and the light-emitting devices located in the second-type pixel openings K2 may have different performance characteristics. The shape of the first protrusion L1 located within the first-type pixel openings K1 may differ from the shape of the first protrusion L1 located within the second-type pixel openings K2. In this way, the first protrusion L1 can better accommodate light-emitting devices with different performance characteristics, thereby improving the luminous efficiency of each light-emitting device and ultimately improving the overall efficiency of the display panel 000.

[0063] In summary, this application provides a display panel in which the side of the first defining layer facing the pixel opening protrudes beyond the side of the second defining layer facing the pixel opening, and the side of the third defining layer facing the pixel opening protrudes beyond the side of the second defining layer facing the pixel opening. This creates a concave structure on the sidewall of the pixel defining layer facing the pixel opening, which can isolate at least one layer of the organic light-emitting layer, such as the charge-generating layer, effectively isolating lateral leakage current and ensuring a good display effect. Furthermore, the shape of the first protrusion located within the first type of pixel opening differs from the shape of the first protrusion located within the second type of pixel opening, allowing the first protrusion to better adapt to the light-emitting devices within different pixel openings, improving the efficiency of each light-emitting device, resulting in a more balanced luminous efficiency, and thus improving the overall efficiency of the display panel.

[0064] Please refer to Figure 3 The pixel definition layer 300 may have a concave structure on its sidewall near the pixel opening. To ensure the formation of the concave structure, the first definition layer 301 and the second definition layer 302 may be made of different materials, and the third definition layer 303 and the second definition layer 302 may also be made of different materials. For example, the first definition layer 301 and the third definition layer 303 may both be made of silicon oxide, and the second definition layer 302 may be made of silicon nitride. Thus, depending on the different etching rates of the etching material on the first definition layer 301 and the second definition layer 302, the first definition layer 301 may protrude from the second definition layer 302, and depending on the different etching rates of the etching material on the third definition layer 303 and the second definition layer 302, the third definition layer 303 may protrude from the second definition layer 302, thereby forming a concave structure on the sidewall of the pixel definition layer 300.

[0065] Please refer to Figure 4 The display panel 000 may also include an encapsulation layer 600 and a color filter layer 700.

[0066] The encapsulation layer 600 can be located on the side of the second electrode layer 500 away from the driving backplate 100. The encapsulation layer 600 can be used to protect the light-emitting device located in the pixel opening and prevent water and oxygen from the external environment from entering the light-emitting device and causing the organic light-emitting layer 400 to fail.

[0067] The color filter layer 700 can be located on the side of the encapsulation layer 600 facing away from the driving backplane 100. The color filter layer 700 can include multiple color resist blocks, which can correspond one-to-one with multiple pixel openings. The orthographic projection of the pixel opening on the driving backplane 100 can lie within the orthographic projection of the corresponding color resist block on the driving backplane 100. In this way, the light emitted by the light-emitting device in the pixel opening can selectively pass through the corresponding color resist block and then be emitted, thereby obtaining the light of the desired color.

[0068] The plurality of color resist blocks may include a plurality of blue color resist blocks B, a plurality of red color resist blocks R, and a plurality of green color resist blocks G. The plurality of first-type pixel openings K1 may all be blue pixel openings, and the plurality of second-type pixel openings K2 may include a plurality of red pixel openings and a plurality of green pixel openings. The orthographic projection of the blue pixel openings on the driving backplate 100 may lie within the orthographic projection of the blue color resist block B on the driving backplate 100, the orthographic projection of the red pixel openings on the driving backplate 100 may lie within the orthographic projection of the red color resist block R on the driving backplate 100, and the orthographic projection of the green pixel openings on the driving backplate 100 may lie within the orthographic projection of the green color resist block G on the driving backplate 100. In this way, the light emitted by the light-emitting devices in the red, green, and blue pixel openings can selectively pass through the corresponding color resist blocks, thereby filtering out other colors of light and obtaining the light of the color required by the pixel opening.

[0069] It should be noted that the organic light-emitting layer 400 may include a first light-emitting layer, a second light-emitting layer, and a charge-generating layer located between them. The second light-emitting layer is closer to the driving backplate 100 than the first light-emitting layer. The first light-emitting layer may be configured to emit blue light, and the second light-emitting layer may be configured to emit yellow light. Specifically, the second light-emitting layer may be formed by stacking a light-emitting layer that emits red light and a light-emitting layer that emits green light. For the first type of pixel opening K1, the first type of pixel opening K1 may be a blue pixel opening, and the required blue light may be emitted by the first light-emitting layer. For the second type of pixel opening K2, the second type of pixel opening K2 may include a red pixel opening and a green pixel opening. The red light required for the red pixel opening and the green light required for the green pixel opening may both be emitted by the light-emitting layer in the second light-emitting layer.

[0070] Thus, the organic light-emitting layer 400 is composed of a second light-emitting layer that can emit yellow light and a first light-emitting layer that can emit blue light, with a charge generation layer connecting them in series, so that the organic light-emitting layer 400 can emit white light.

[0071] White light selectively passes through color resist blocks corresponding to different pixel openings, thus obtaining red, green, and blue light. Specifically, white light emitted by the light-emitting device located in the blue pixel opening is selectively filtered to blue after passing through the corresponding blue color resist block B; white light emitted by the light-emitting device located in the red pixel opening is selectively filtered to red after passing through the corresponding red color resist block R; and white light emitted by the light-emitting device located in the green pixel opening is selectively filtered to green after passing through the corresponding green color resist block G. In this way, the different colors of red, green, and blue light obtained allow the display panel 000 to display corresponding images.

[0072] It should be noted that when the organic light-emitting layer 400 is distorted, the internal resistance of the distorted portion is relatively small. At lower gray levels, the current will preferentially pass through the distorted portion of the organic light-emitting layer 400, causing the distorted portion to emit light. When the first protrusion L1 in the pixel opening protrudes beyond the second protrusion L2 in the pixel opening, the distortion of the organic light-emitting layer 400 may typically occur on the side of the first protrusion L1 away from the driving backplate 100. The second light-emitting layer in this part of the organic light-emitting layer 400 is not in contact with the first electrode 201, so this part of the second light-emitting layer may not emit light, and only the distorted portion of the first light-emitting layer will emit light. This causes the light-emitting device in the pixel opening to emit blue light before reaching the turn-on voltage, resulting in a low turn-on voltage and thus a poor display effect. If the organic light-emitting layer 400 in the first type of pixel opening K1 is distorted, the emitted blue light will pass through the corresponding blue color resist block B, resulting in a bluish tint to the displayed image at lower gray levels.

[0073] Therefore, the light-emitting devices within pixel openings of different colors have different performance. In this application, the shape of the first protrusion L1 located within the pixel opening is differentiated to accommodate light-emitting devices with different performance. There are multiple ways to differentiate the shape of the first protrusion L1 located within the first type of pixel opening K1 from the shape of the first protrusion L1 located within the second type of pixel opening K2. This application will illustrate this with the following three implementation methods as examples.

[0074] In the first implementation, the length of the first protrusion L1 located within the first type of pixel opening K1 is designed to be different from the length of the first protrusion L1 located within the second type of pixel opening K2. For an example, please refer to... Figures 5 to 7 The different lengths of the first protrusion L1 and the second protrusion L2 within the pixel opening significantly affect the distortion of the organic light-emitting layer 400 within the pixel opening, thus affecting the occurrence of leakage current and consequently the luminous efficiency of the light-emitting device.

[0075] Figure 5 In this case, the side of the first protrusion L1 facing the pixel opening is flush with the side of the second protrusion L2 facing the pixel opening. At this time, the organic light-emitting layer 400 suffers from severe distortion and leakage. Figure 6 and Figure 7 In the middle, the side of the first protrusion L1 facing the pixel opening protrudes further than the side of the second protrusion L2 facing the pixel opening, but... Figure 6 The first protrusion L1 protrudes from the second protrusion L2 by a relatively short length. Figure 7 The first protrusion L1 protrudes beyond the second protrusion L2 by a relatively longer length. This can be seen from the figure. Figure 7 The distortion degree of the organic light-emitting layer 400 in the middle is lower than Figure 6 The degree of distortion in the organic light-emitting layer 400, and Figure 6 The distortion degree of the organic light-emitting layer 400 in the middle is lower than that of the organic light-emitting layer 400. Figure 5 The distortion degree of the organic light-emitting layer 400 is controlled. That is, within a certain range, as the length of the first protrusion L1 protruding beyond the second protrusion L2 increases, the degree of distortion in the organic light-emitting layer 400 decreases. Therefore, by controlling the length of the first protrusion L1 protruding beyond the second protrusion L2, the distortion degree can be adjusted, thereby improving the luminous efficiency of the light-emitting device.

[0076] Based on this, please refer to Figure 8 and Figure 9 The length of the first protrusion L1 protruding from the second defining layer 302 within the first type pixel opening K1 can be greater than the length of the first protrusion L1 protruding from the second defining layer 302 within the second type pixel opening K2; and the height H1 of the first protrusion L1 within the first type pixel opening K1 in the direction perpendicular to the driving back plate 100 can be equal to the height H2 of the first protrusion L1 within the second type pixel opening K2 in the direction perpendicular to the driving back plate 100. Furthermore, the length of the second protrusion L2 protruding from the second defining layer 302 within the first type pixel opening K1 can be equal to the length of the second protrusion L2 protruding from the second defining layer 302 within the second type pixel opening K2. Here, there are various ways to design the lengths of the first protrusion L1 and the second protrusion L2 within the first type pixel opening K1, and the lengths of the first protrusion L1 and the second protrusion L2 within the second type pixel opening K2. This application embodiment will be illustrated using the following two cases as examples:

[0077] In the first case, please refer to Figure 8 For the first protrusion L1 and the second protrusion L2 located within the first type of pixel opening K1, the side of the first protrusion L1 facing the first type of pixel opening K1 can protrude beyond the side of the second protrusion L2 facing the first type of pixel opening K1. For the first protrusion L1 and the second protrusion L2 located within the second type of pixel opening K2, the side of the first protrusion L1 facing the second type of pixel opening K2 can be flush with the side of the second protrusion L2 facing the second type of pixel opening K2.

[0078] For the first protrusion L1 and the second protrusion L2 located within the first type of pixel opening K1, the first protrusion L1 can protrude beyond the second protrusion L2. The portion of the first protrusion L1 that protrudes beyond the second protrusion L2 can make the formed organic light-emitting layer 400 smoother, especially the first light-emitting layer. This can reduce the distortion of the first light-emitting layer, resulting in a higher flatness of the film layer. This reduces the occurrence of leakage current in the distorted portion, thereby improving the transfer rate of electrons and holes and ensuring the luminous efficiency of the light-emitting device located within the first type of pixel opening K1.

[0079] For the first protrusion L1 and the second protrusion L2 located within the second type pixel opening K2, the first protrusion L1 may not protrude beyond the second protrusion L2. That is, compared to the first protrusion L1 within the first type pixel opening K1, the first protrusion L1 within the second type pixel opening K2 is shorter in the direction near the pixel opening, thus exposing more of the first electrode 201 corresponding to the second type pixel opening K2. Consequently, the second light-emitting layer within the second type pixel opening K2 has a larger contact area with the first electrode 201, resulting in a larger area available for light emission and improving the luminous efficiency of the light-emitting device within the second type pixel opening K2. Meanwhile, the length of the first protrusion L1 is relatively short, which results in a more severe distortion of the first light-emitting layer on the side of the first protrusion L1 that is far away from the driving back plate 100. The distorted part of the first light-emitting layer has severe leakage and emits blue light. However, the blue light cannot pass through the red color block R or the green color block G corresponding to the second type pixel opening K2, so it will not affect the display screen of the display panel 000.

[0080] Therefore, the first protrusion L1 located within the first type of pixel opening K1 can be adapted to the light-emitting device located within the first type of pixel opening K1, and the first protrusion L1 located within the second type of pixel opening K2 can be adapted to the light-emitting device located within the second type of pixel opening K2. In this way, the luminous efficiency of the light-emitting devices located in different pixel openings can be improved, and the luminous efficiency of each light-emitting device is more balanced, thereby improving the overall efficiency of the display panel 000 and achieving a better display effect.

[0081] In the second case, please refer to Figure 9For the first protrusion L1 and the second protrusion L2 located within the first type of pixel opening K1, the side of the first protrusion L1 facing the first type of pixel opening K1 can protrude beyond the side of the second protrusion L2 facing the first type of pixel opening K1, and the length by which the first protrusion L1 protrudes beyond the second protrusion L2 is a first length X1. For the first protrusion L1 and the second protrusion L2 located within the second type of pixel opening K2, the side of the first protrusion L1 facing the second type of pixel opening K2 can protrude beyond the side of the second protrusion L2 facing the second type of pixel opening K2, and the length by which the first protrusion L1 protrudes beyond the second protrusion L2 is a second length X2. The first length X1 can be greater than the second length X2.

[0082] Compared to the length of the first protrusion L1 protruding beyond the second protrusion L2 within the second type of pixel opening K2, the length of the first protrusion L1 protruding beyond the second protrusion L2 within the first type of pixel opening K1 can be longer. Therefore, the organic light-emitting layer 400 within the first type of pixel opening K1 can be formed more smoothly, especially the first light-emitting layer, which reduces distortion in the first light-emitting layer, resulting in higher film flatness and reduced leakage current in the distorted portion. This reduces the phenomenon of blue light emission from the distorted portion, and to some extent avoids the problem of a bluish tint in the displayed image at lower grayscale levels. Simultaneously, reduced distortion and leakage current improve the electron and hole transfer rate, thereby ensuring the luminous efficiency of the light-emitting device within the first type of pixel opening K1.

[0083] Compared to the length of the first protrusion L1 protruding from the second protrusion L2 within the first type of pixel opening K1, the length of the first protrusion L1 protruding from the second protrusion L2 within the second type of pixel opening K2 can be shorter. That is, the length of the first protrusion L1 within the second type of pixel opening K2 is shorter in the direction close to the second type of pixel opening K2, resulting in a larger exposed portion of the first electrode 201 corresponding to the second type of pixel opening K2. Thus, the second light-emitting layer within the second type of pixel opening K2 has a larger contact area with the first electrode 201, allowing for a larger area for light emission and thereby improving the luminous efficiency of the light-emitting device within the second type of pixel opening K2.

[0084] To this end, the first protrusion L1 located within the openings of different types of pixels is set with different lengths, which can better adapt to the light-emitting devices located within the openings of different types of pixels. In this way, the luminous efficiency of each light-emitting device can be improved, thereby improving the overall efficiency of the display panel 000, and at the same time, it can also avoid the problem of the displayed image appearing bluish at lower gray levels to a certain extent.

[0085] Preferably, the first length X1 can be 0.01 micrometers to 0.02 micrometers, that is, the length of the first protrusion L1 protruding from the second protrusion L2 within the first type of pixel opening K1 can be 0.01 micrometers to 0.02 micrometers. The second length X2 can be less than or equal to 0.01 micrometers, that is, the length of the first protrusion L1 protruding from the second protrusion L2 within the second type of pixel opening K2 can be less than or equal to 0.01 micrometers.

[0086] In this way, the first protrusion L1 can better adapt to the light-emitting devices located in different pixel openings, improving the luminous efficiency of each light-emitting device. At the same time, it can also avoid the problem of premature blue light activation to a certain extent, thereby controlling the activation sequence of pixels of different colors, avoiding low activation voltage, and enabling the display panel 000 to achieve a better display effect.

[0087] For the second implementation method, please refer to [link / reference]. Figure 10 The height H1 of the first protrusion L1 located within the first type of pixel opening K1 in the direction perpendicular to the driving back plate 100 can be less than the height H2 of the first protrusion L1 located within the second type of pixel opening K2 in the direction perpendicular to the driving back plate 100. The length of the first protrusion L1 protruding from the second definition layer 302 within the first type of pixel opening K1 can be equal to the length of the first protrusion L1 protruding from the second definition layer 302 within the second type of pixel opening K2. Similarly, the length of the second protrusion L2 protruding from the second definition layer 302 within the first type of pixel opening K1 can be equal to the length of the second protrusion L2 protruding from the second definition layer 302 within the second type of pixel opening K2.

[0088] Compared to the height H2 of the first protrusion L1 located within the second type pixel opening K2 in the direction perpendicular to the driving backplate 100, the height H1 of the first protrusion L1 located within the first type pixel opening K1 in the direction perpendicular to the driving backplate 100 is smaller. This allows the leakage path within the first type pixel opening K1 to be controlled so that the second light-emitting layer experiences distortion leakage, while the first light-emitting layer does not. This ensures the electron and hole transfer rate within the first light-emitting layer, thereby guaranteeing the blue light emission efficiency of the light-emitting device located within the first type pixel opening K1. The distorted portion of the second light-emitting layer emits yellow light, which cannot pass through the blue color resist block B corresponding to the first type pixel opening K1, thus avoiding a yellowish tint in lower grayscale displays.

[0089] Compared to the height H1 of the first protrusion L1 located within the first type of pixel opening K1 in the direction perpendicular to the driving backplate 100, the height H2 of the first protrusion L1 located within the second type of pixel opening K2 in the direction perpendicular to the driving backplate 100 is larger. This allows the leakage path within the second type of pixel opening K2 to be controlled so that the first light-emitting layer experiences distortion leakage, while the second light-emitting layer does not. This ensures the electron and hole transfer rate within the second light-emitting layer, thereby guaranteeing the red or green light luminous efficiency of the light-emitting device located within the second type of pixel opening K2. Furthermore, the distorted portion of the first light-emitting layer emits blue light, which cannot pass through the red color resist R or green color resist G corresponding to the second type of pixel opening K2, thus avoiding the problem of a bluish tint in the display at lower grayscale levels.

[0090] Preferably, the height H1 of the first protrusion L1 located within the first type of pixel opening K1 in the direction perpendicular to the driving backplate 100 is less than or equal to 350 angstroms, and the height H2 of the first protrusion L1 located within the second type of pixel opening K2 in the direction perpendicular to the driving backplate 100 is between 400 angstroms and 500 angstroms. In this way, the first protrusion L1 can be well adapted to the light-emitting devices within different pixel openings.

[0091] To this end, the first protrusion L1 located within different types of pixel openings is set with different heights, which can better adapt to the light-emitting devices located within different types of pixel openings. In this way, the luminous efficiency of each light-emitting device can be improved, thereby improving the overall efficiency of the display panel 000, and also enabling the display panel 000 to achieve a better display effect.

[0092] For the third implementation method, please refer to... Figure 11 The length of the first protrusion L1 within the first type pixel opening K1 protruding out of the second definition layer 302 can be greater than the length of the first protrusion L1 within the second type pixel opening K2 protruding out of the second definition layer 302. The height H1 of the first protrusion L1 within the first type pixel opening K1 in the direction perpendicular to the driving backplate 100 can be less than the height H2 of the first protrusion L1 within the second type pixel opening K2 in the direction perpendicular to the driving backplate 100. Furthermore, the length of the second protrusion L2 within the first type pixel opening K1 protruding out of the second definition layer 302 can be equal to the length of the second protrusion L2 within the second type pixel opening K2 protruding out of the second definition layer 302.

[0093] For the first protrusion L1 located within the first type of pixel opening K1, the height H1 of the first protrusion L1 in the direction perpendicular to the driving backplate 100 is smaller. Therefore, the leakage path within the first type of pixel opening K1 is controlled as second light-emitting layer distortion leakage. The yellow light emitted by the distorted portion of the second light-emitting layer cannot pass through the blue color block B corresponding to the first type of pixel opening K1, thus avoiding the problem of a yellowish display at lower grayscale levels. Simultaneously, the first protrusion L1 within the first type of pixel opening K1 protrudes beyond the second protrusion L2. The protrusion of the first protrusion L1 relative to the second protrusion L2 makes the formed organic light-emitting layer 400 smoother, thereby reducing the distortion of the second light-emitting layer, resulting in higher film flatness, reducing leakage phenomena, and thus improving the electron and hole transfer rate. This, in turn, ensures the blue light emission efficiency of the light-emitting device located within the first type of pixel opening K1.

[0094] For the first protrusion L1 located within the second type pixel opening K2, if the height H1 of the first protrusion L1 in the direction perpendicular to the driving backplate 100 is greater, then the leakage path within the second type pixel opening K2 is controlled as first light-emitting layer distortion leakage. The blue light emitted by the distorted portion of the first light-emitting layer cannot pass through the red color block R or the green color block G corresponding to the second type pixel opening K2, thereby avoiding the problem of a bluish tint in the display at lower grayscale levels. Simultaneously, the first protrusion L1 located within the second type pixel opening K2 may not protrude beyond the second protrusion L2, or the first protrusion L1 may protrude beyond the second protrusion L2, but the length of the first protrusion L1 protruding relative to the second protrusion L2 is shorter. Thus, the first electrode 201 corresponding to the second type pixel opening K2 has a larger exposed portion, and the second light-emitting layer located in the second type pixel opening K2 has a larger contact portion with the first electrode 201. As a result, the area of ​​the second light-emitting layer that can be used for light emission is larger, which can improve the red light emission efficiency or green light emission efficiency of the light-emitting device located in the second type pixel opening K2.

[0095] To this end, the first protrusion L1 located within the openings of different types of pixels has different lengths and heights, which can better accommodate the light-emitting devices located within the openings of different types of pixels. In this way, the luminous efficiency of each light-emitting device can be improved, thereby improving the overall efficiency of the display panel 000, and also enabling the display panel 000 to achieve a better display effect.

[0096] It should be noted that the above embodiments are illustrative examples of the second light-emitting layer in the organic light-emitting layer 400 that emits yellow light being closer to the driving backplate 100 than the first light-emitting layer that emits blue light. In other possible implementations, the second light-emitting layer in the organic light-emitting layer 400 that emits yellow light can be further away from the driving backplate 100 than the first light-emitting layer that emits blue light. In this case, it is necessary to ensure that the length of the first protrusion L1 located in the second type pixel opening K2 is longer in the direction close to the second type pixel opening K2, while the length of the first protrusion L1 located in the first type pixel opening K1 is shorter in the direction close to the first type pixel opening K1; and / or, it is necessary to ensure that the height of the first protrusion L1 located in the second type pixel opening K2 is smaller in the direction perpendicular to the driving backplate 100, while the height of the first protrusion L1 located in the first type pixel opening K1 is larger in the direction perpendicular to the driving backplate 100.

[0097] It should also be noted that, as verified by the inventors, the technical solutions provided in the embodiments of this application are applicable to display panels 000 with weak microcavity structures, wherein the material of the second electrode layer 500 can be indium tin oxide or indium zinc oxide; the technical solutions provided in the embodiments of this application are also applicable to display panels 000 with strong microcavity structures, wherein the material of the second electrode layer 500 can be magnesium or silver.

[0098] In summary, this application provides a display panel in which the side of the first defining layer facing the pixel opening protrudes beyond the side of the second defining layer facing the pixel opening, and the side of the third defining layer facing the pixel opening protrudes beyond the side of the second defining layer facing the pixel opening. This creates a concave structure on the sidewall of the pixel defining layer facing the pixel opening, which can isolate at least one layer of the organic light-emitting layer, such as the charge-generating layer, effectively isolating lateral leakage current and ensuring a good display effect. Furthermore, the shape of the first protrusion located within the first type of pixel opening differs from the shape of the first protrusion located within the second type of pixel opening, allowing the first protrusion to better adapt to the light-emitting devices within different pixel openings, improving the efficiency of each light-emitting device, resulting in a more balanced luminous efficiency, and thus improving the overall efficiency of the display panel.

[0099] This application also provides a display device, which can be any product or component with display function, such as AR (Augmented Reality), VR (Virtual Reality), mobile phone, tablet computer, television, monitor, laptop computer, digital photo frame, navigator, etc.

[0100] The display device may include a driver chip and a display panel. The display panel may be a silicon-based OLED display panel. The display panel may be the display panel 000 described in the above embodiments, and the driver chip may be electrically connected to the display panel 000 to drive the display panel 000 to display an image.

[0101] It should be noted that the dimensions of layers and regions may be exaggerated in the accompanying drawings for clarity. Furthermore, it is understood that when an element or layer is referred to as being "on" another element or layer, it can be directly on the other element, or there may be intermediate layers. Additionally, it is understood that when an element or layer is referred to as being "below" another element or layer, it can be directly below the other element, or there may be more than one intermediate layer or element. Furthermore, it is also understood that when a layer or element is referred to as being "between" two layers or two elements, it can be the only layer between the two layers or two elements, or there may be more than one intermediate layer or element. Similar reference numerals throughout indicate similar elements.

[0102] In this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term "multiple" refers to two or more unless otherwise expressly defined.

[0103] The above description is merely an optional embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A display panel, characterized in that, include: Drive backplane, first electrode layer, pixel definition layer, organic light-emitting layer and second electrode layer; The first electrode layer is located on one side of the drive back plate, and the first electrode layer has a plurality of separately disposed first electrodes, which are electrically connected to the drive back plate. The pixel definition layer is located on the side of the first electrode layer opposite to the driving backplate. The pixel definition layer has multiple pixel openings, including multiple first-type pixel openings and multiple second-type pixel openings. The organic light-emitting layer is located on the side of the pixel definition layer opposite to the driving backplate; The second electrode layer is located on the side of the organic light-emitting layer opposite to the driving backplate; The pixel definition layer includes a first definition layer, a second definition layer, and a third definition layer stacked along a direction perpendicular to and away from the driving backplate, wherein the pixel opening passes through the first definition layer, the second definition layer, and the third definition layer in sequence; The first defining layer protrudes from the side of the second defining layer facing the pixel opening, and the portion of the first defining layer protruding from the second defining layer is a first protrusion; the third defining layer protrudes from the side of the second defining layer facing the pixel opening, and the portion of the third defining layer protruding from the second defining layer is a second protrusion. The shape of the first protrusion located within the first type of pixel opening is different from the shape of the first protrusion located within the second type of pixel opening.

2. The display panel according to claim 1, characterized in that, The length by which the first protrusion within the first type of pixel opening protrudes beyond the second defining layer is greater than the length by which the first protrusion within the second type of pixel opening protrudes beyond the second defining layer.

3. The display panel according to claim 2, characterized in that, For the first protrusion and the second protrusion located within the first type of pixel opening, the side of the first protrusion facing the first type of pixel opening protrudes from the side of the second protrusion facing the first type of pixel opening. For the first protrusion and the second protrusion located within the second type of pixel opening, the side of the first protrusion facing the second type of pixel opening is flush with the side of the second protrusion facing the second type of pixel opening.

4. The display panel according to claim 2, characterized in that, For the first protrusion and the second protrusion located within the first type of pixel opening, the first protrusion protrudes from the side facing the first type of pixel opening and protrudes from the side facing the first type of pixel opening, and the length by which the first protrusion protrudes from the second protrusion is a first length. For the first protrusion and the second protrusion located within the second type of pixel opening, the first protrusion protrudes from the side facing the second type of pixel opening and from the side facing the second type of pixel opening, and the length by which the first protrusion protrudes from the second protrusion is the second length. Wherein, the first length is greater than the second length.

5. The display panel according to claim 4, characterized in that, The first length ranges from 0.01 micrometers to 0.02 micrometers, and the second length ranges from less than or equal to 0.01 micrometers.

6. The display panel according to any one of claims 2 to 5, characterized in that, The height of the first protrusion located within the first type of pixel opening in the direction perpendicular to the driving backplate is equal to the height of the first protrusion located within the second type of pixel opening in the direction perpendicular to the driving backplate.

7. The display panel according to claim 1, characterized in that, The height of the first protrusion located within the first type of pixel opening in the direction perpendicular to the driving backplate is less than the height of the first protrusion located within the second type of pixel opening in the direction perpendicular to the driving backplate.

8. The display panel according to claim 7, characterized in that, The height of the first protrusion located within the first type of pixel opening in the direction perpendicular to the driving backplate is less than or equal to 350 angstroms, and the height of the first protrusion located within the second type of pixel opening in the direction perpendicular to the driving backplate is 400 angstroms to 500 angstroms.

9. The display panel according to claim 7 or 8, characterized in that, The length by which the first protrusion within the first type of pixel opening protrudes beyond the second definition layer is equal to the length by which the first protrusion within the second type of pixel opening protrudes beyond the second definition layer.

10. The display panel according to claim 1, characterized in that, The length by which the first protrusion within the first type of pixel opening protrudes beyond the second definition layer is greater than the length by which the first protrusion within the second type of pixel opening protrudes beyond the second definition layer. Furthermore, the height of the first protrusion located within the first type of pixel opening in the direction perpendicular to the driving backplate is less than the height of the first protrusion located within the second type of pixel opening in the direction perpendicular to the driving backplate.

11. The display panel according to any one of claims 1 to 5, 7 to 8, and 10, characterized in that, The display panel further includes an encapsulation layer and a color filter layer; the encapsulation layer is located on the side of the second electrode layer away from the driving backplate; the color filter layer is located on the side of the encapsulation layer away from the driving backplate, and the color filter layer includes: a plurality of color resist blocks corresponding one-to-one with the pixel openings, and the orthographic projection of the pixel openings on the driving backplate is located within the orthographic projection of the corresponding color resist blocks on the driving backplate.

12. The display panel according to claim 11, characterized in that, The plurality of color resist blocks include a plurality of blue color resist blocks, a plurality of red color resist blocks and a plurality of green color resist blocks; The plurality of first-type pixel openings are all blue pixel openings, and the orthographic projection of the blue pixel openings on the driving back panel is located within the orthographic projection of the blue color resist on the driving back panel; the second-type pixel openings include a plurality of red pixel openings and a plurality of green pixel openings, the orthographic projection of the red pixel openings on the driving back panel is located within the orthographic projection of the red color resist on the driving back panel, and the orthographic projection of the green pixel openings on the driving back panel is located within the orthographic projection of the green color resist on the driving back panel.

13. The display panel according to claim 12, characterized in that, The organic light-emitting layer includes a first light-emitting layer, a second light-emitting layer, and a charge-generating layer located between the two; The second light-emitting layer is closer to the drive backplate than the first light-emitting layer; and the first light-emitting layer is configured to emit blue light, while the second light-emitting layer is configured to emit yellow light.

14. A display device, characterized in that, It includes a driver chip and a display panel electrically connected to the driver chip, the display panel including the display panel according to any one of claims 1 to 13.

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