Display panel and display device

Abstract

The present application provides a display panel and a display device. The display panel comprises a first sublayer and a second sublayer in a pixel definition layer, and the refractive index of the second sublayer is greater than that of the first sublayer. Then, the contact surface of the first sublayer and the second sublayer forms a total reflection surface, so that the light emitted by the luminescent material layer is reflected out of the display panel when it is irradiated on the contact surface of the first sublayer and the second sublayer, thereby improving the light extraction efficiency of the display panel. In addition, a microstructured laminated film is formed by the pixel definition layer, without the need for additional film layers, thereby reducing the thickness of the display panel. The microstructured laminated film formed by the pixel definition layer is closer to the luminescent material layer, and can improve the light extraction efficiency compared to the external microstructured laminated film. In addition, the pixel definition layer can adopt a high-temperature process, with more material selectivity, more stable performance, and lower cost.

Description

Technical Field

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

[0002] OLED (Organic Light-Emitting Diode) display devices are widely used in various fields due to their light weight, wide viewing angle, low power consumption, fast response speed, low temperature resistance, high luminous efficiency, and the ability to produce curved flexible display screens. OLED display devices include top-emitting OLED display devices and bottom-emitting OLED display devices. Top-emitting OLED display devices are not affected by whether the substrate is light-transmitting, which can effectively improve the aperture ratio of OLED display devices, facilitate integration with transistor backplanes, and can narrow the spectrum and color purity. They are widely used in large and small electronic products. However, top-emitting OLED display devices have the problem of low external quantum efficiency (i.e., light output efficiency). Research has found that this problem is caused by the influence of waveguide effect, substrate effect, surface plasma effect, absorption effect, etc. In order to improve the light extraction efficiency, a microstructure (micro lens array, MLA) laminated film is provided in existing OLED display devices. Specifically, an MLA structure is provided above the touch layer to improve the light extraction efficiency. However, setting an MLA structure above the touch layer will increase the thickness of the OLED display device, and when the OLED display device is one of the dynamic bending, waterfall and four-curved screens, there is a risk of film peeling.

[0003] Therefore, the existing method of using a microstructured laminated film to improve the light removal efficiency of an OLED display device has technical problems such as a large thickness of the OLED display device and a risk of film peeling. Summary of the Invention

[0004] The embodiments of the present application provide a display panel and a display device to solve the technical problems of the existing method of using a microstructured laminated film to improve the light removal efficiency of an OLED display device, such as the large thickness of the OLED display device and the risk of film peeling.

[0005] An embodiment of the present application provides a display panel, comprising:

[0006] substrate;

[0007] A driving circuit layer is provided on one side of the substrate;

[0008] a light-emitting functional layer, disposed on a side of the driving circuit layer away from the substrate, the light-emitting functional layer comprising a pixel electrode layer, a light-emitting material layer, and a pixel definition layer, the pixel electrode layer being disposed on a side of the driving circuit layer away from the substrate, the pixel definition layer being disposed on a side of the pixel electrode layer away from the driving circuit layer, and the light-emitting material layer being disposed on a side of the pixel definition layer away from the pixel electrode layer;

[0009] In which, the pixel definition layer includes a first sublayer and a second sublayer, the first sublayer is arranged on the side of the pixel electrode layer away from the driving circuit layer, the first sublayer includes a first pixel opening, the second sublayer is arranged on the side of the first sublayer away from the pixel electrode layer and extends into the first pixel opening, the second sublayer includes a second pixel opening, the light-emitting material layer at least covers the second pixel opening, and the refractive index of the second sublayer is greater than the refractive index of the first sublayer.

[0010] In some embodiments, the material of the second sub-layer includes a transparent material, and the material of the first sub-layer includes one of a transparent material and a non-transparent material.

[0011] In some embodiments, the material of the first sub-layer includes a black material.

[0012] In some embodiments, the thickness of the first sub-layer is greater than the thickness of the second sub-layer.

[0013] In some embodiments, the light-emitting functional layer further includes a common electrode layer, and the thickness of the first sublayer is greater than or equal to the sum of the thicknesses of the pixel electrode layer, the light-emitting material layer, and the common electrode layer.

[0014] In some embodiments, the display panel further includes a filter layer, which includes a plurality of color resists and a black matrix arranged between the color resists. The pixel definition layer is arranged corresponding to the black matrix, and there is a distance between the edge of the black matrix and the edge of the first sublayer.

[0015] In some embodiments, the distance between the edge of the black matrix and the edge of the second sublayer ranges from 2 microns to 4 microns, and the distance between the edge of the first sublayer and the edge of the second sublayer ranges from 1 micron to 3 microns.

[0016] In some embodiments, the pixel electrode layer includes: a plurality of pixel electrodes arranged in an array, the first pixel opening is set corresponding to the corresponding pixel electrode, the second pixel opening is set corresponding to the corresponding first pixel opening, and the area of ​​the second pixel opening is smaller than the area of ​​the first pixel opening.

[0017] In some embodiments, a shape of the first pixel opening is the same as a shape of the second pixel opening.

[0018] In some embodiments, the second sublayer is close to the first lower surface of the substrate and contacts at least a portion of the first sublayer away from the second upper surface of the substrate, and contacts at least a portion of the pixel electrode away from the third upper surface of the substrate.

[0019] In some embodiments, the first sub-layer and the pixel electrode layer form a first angle, the second sub-layer and the pixel electrode layer form a second angle, and the first angle is greater than or equal to the second angle.

[0020] In some embodiments, the first angle ranges from 20 degrees to 60 degrees.

[0021] In some embodiments, the refractive index of the first sub-layer ranges from 1.4 to 1.55, and the refractive index of the second sub-layer ranges from 1.55 to 1.85.

[0022] In some embodiments, a difference between a refractive index of the second sub-layer and a refractive index of the first sub-layer ranges from 0.1 to 0.15.

[0023] In some embodiments, the light-emitting functional layer further includes a common electrode layer, the thickness of the first sublayer is equal to the thickness of the second sublayer, and the thickness of the pixel definition layer is greater than the sum of the thicknesses of the pixel electrode layer, the light-emitting material layer and the common electrode layer.

[0024] In some embodiments, the pixel electrode layer includes: a plurality of pixel electrodes arranged in an array, the first pixel opening is set corresponding to the corresponding pixel electrode, the second pixel opening is set corresponding to the corresponding first pixel opening, the area of ​​the second pixel opening is smaller than the area of ​​the first pixel opening, the projection of the second pixel opening on the substrate is located within the projection of the first pixel opening on the substrate, and the distance between the second pixel opening and the first pixel opening is in the range of 2 to 4 microns.

[0025] At the same time, an embodiment of the present application provides a display device, which includes the display panel as described in any of the above embodiments.

[0026] Beneficial effects: The present application provides a display panel and a display device, which display panel includes a substrate, a driving circuit layer and a light-emitting functional layer, the driving circuit layer is arranged on one side of the substrate, the light-emitting functional layer is arranged on the side of the driving circuit layer away from the substrate, the light-emitting functional layer includes a pixel electrode layer, a light-emitting material layer and a pixel definition layer, the pixel electrode layer is arranged on the side of the driving circuit layer away from the substrate, the pixel definition layer is arranged on the side of the pixel electrode layer away from the driving circuit layer, and the light-emitting material layer is arranged on the side of the pixel electrode layer away from the driving circuit layer, wherein the pixel definition layer includes a first sublayer and a second sublayer, the first sublayer is arranged on the side of the pixel electrode layer away from the driving circuit layer, the first sublayer includes a first pixel opening, the second sublayer is arranged on the side of the first sublayer away from the pixel electrode layer and extends into the first pixel opening, the second sublayer includes a second pixel opening, the light-emitting material layer at least covers the second pixel opening, and the refractive index of the second sublayer is greater than the refractive index of the first sublayer. In the present application, the pixel definition layer includes a first sublayer and a second sublayer, and the second sublayer extends into the first pixel opening. The refractive index of the second sublayer is greater than the refractive index of the first sublayer. Then, the contact surface of the first sublayer and the second sublayer forms a total reflection surface, so that the light emitted by the luminescent material layer will be reflected out of the display panel when it hits the contact surface of the first sublayer and the second sublayer, thereby improving the light extraction efficiency of the display panel. In addition, a microstructured laminated film is formed by the pixel definition layer without the need for additional film layers, thereby reducing the thickness of the display panel. The microstructured laminated film formed by the pixel definition layer is closer to the luminescent material layer, and can improve the light extraction efficiency compared to the external microstructured laminated film. In addition, the pixel definition layer can adopt a high-temperature process, with more material selectivity, more stable performance, and lower cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The following detailed description of the specific embodiments of the present application in conjunction with the accompanying drawings will make the technical solutions and other beneficial effects of the present application apparent.

[0028] Figure 1 Schematic diagram of an existing OLED display device.

[0029] Figure 2 This is a first schematic diagram of a display panel provided in an embodiment of the present application.

[0030] Figure 3 Schematic diagram of the first pixel opening and the second pixel opening provided in an embodiment of the present application.

[0031] Figure 4 This is a schematic diagram of the structure of the display panel corresponding to each step of the method for manufacturing the display panel provided in an embodiment of the present application.

[0032] Figure 5 A schematic diagram of a comparative display device provided in an embodiment of the present application.

[0033] Figure 6 A schematic diagram of another comparative display device provided in an embodiment of the present application.

[0034] Figure 7 A schematic diagram of another comparative display device provided in an embodiment of the present application.

[0035] Figure 8 This is a second schematic diagram of a display panel provided in an embodiment of the present application.

[0036] Figure 9 This is a third schematic diagram of the display panel provided in an embodiment of the present application.

[0037] Figure 10 This is a fourth schematic diagram of the display panel provided in an embodiment of the present application. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0039] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present application, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0040] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections, electrical connections, or mutual communication; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0041] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0042] The disclosure below provides many different embodiments or examples for realizing different structures of the present application. In order to simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the present application. In addition, the present application may repeat reference numbers and / or reference letters in different examples, and such repetition is for the purpose of simplicity and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides examples of various specific processes and materials, but those of ordinary skill in the art will appreciate the application of other processes and / or the use of other materials.

[0043] like Figure 1 As shown, the existing OLED display device includes a driving substrate 11, a planarization film layer 12, a pixel definition film layer 14, a light-emitting film layer 13, an encapsulation film layer 15 and a touch film layer 16 arranged in sequence. In order to improve the light extraction efficiency of the OLED display device, a microstructured laminated film is provided on the touch film layer 16. Specifically, Figure 1 As shown, a first light extraction layer 17 and a second light extraction layer 18 are provided on the touch film layer 16. By making the refractive index of the first light extraction layer 17 smaller than the refractive index of the second light extraction layer 18, light can be normally emitted. Figure 1As shown, it can be seen that the internal light 19 emitted by the light-emitting film layer 13 is reflected out of the OLED display device when it is irradiated on the microstructured laminated film, thereby improving the light extraction efficiency of the OLED display device. It is understandable that since the OLED display device is provided with a microstructured laminated film on the touch film layer 16, the thickness of the OLED display device will increase, and when the OLED display device is a curved display device, if it is applied to a static curved screen, the risk of film peeling is low, but when it is applied to products such as dynamic curved screens, waterfall screens, and four-curved screens, the risk of peeling and breaking of the microstructured laminated film will be high. Therefore, the existing method of using a microstructured laminated film to improve the light removal efficiency of the OLED display device has the technical problem that the thickness of the OLED display device is large and the risk of film peeling is prone to occur.

[0044] In order to solve the above technical problems, the embodiments of the present application provide a display panel and a display device to solve the above technical problems.

[0045] like Figure 2 As shown, an embodiment of the present application provides a display panel, and the display panel 2 includes:

[0046] substrate 21;

[0047] The driving circuit layer 22 is provided on one side of the substrate 21;

[0048] a light-emitting functional layer 23 disposed on a side of the driving circuit layer 22 away from the substrate 21, the light-emitting functional layer 23 comprising a pixel electrode layer 231, a light-emitting material layer 233, and a pixel definition layer 232. The pixel electrode layer 231 is disposed on a side of the driving circuit layer 22 away from the substrate 21, the pixel definition layer 232 is disposed on a side of the pixel electrode layer 231 away from the driving circuit layer 22, and the light-emitting material layer 233 is disposed on a side of the pixel electrode layer 231 away from the driving circuit layer 22;

[0049] In which, the pixel definition layer 232 includes a first sublayer 232a and a second sublayer 232b, the first sublayer 232a is arranged on the side of the pixel electrode layer 231 away from the driving circuit layer 22, the first sublayer 232a includes a first pixel opening 311, the second sublayer 232b is arranged on the side of the first sublayer 232a away from the pixel electrode layer 231 and extends into the first pixel opening 311, the second sublayer 232b includes a second pixel opening 312, the light-emitting material layer 233 at least covers the second pixel opening 312, and the refractive index of the second sublayer 232b is greater than the refractive index of the first sublayer 232a.

[0050] An embodiment of the present application provides a display panel, which comprises a pixel definition layer including a first sublayer and a second sublayer, and the second sublayer extends into the first pixel opening. The refractive index of the second sublayer is greater than the refractive index of the first sublayer, and the contact surface of the first sublayer and the second sublayer forms a total reflection surface, so that the light emitted by the luminescent material layer is reflected out of the display panel when it is irradiated on the contact surface of the first sublayer and the second sublayer, thereby improving the light extraction efficiency of the display panel. A microstructured laminated film is formed by the pixel definition layer without the need for additional film layers, thereby reducing the thickness of the display panel. The microstructured laminated film formed by the pixel definition layer is closer to the luminescent material layer, and can improve the light extraction efficiency compared to the external microstructured laminated film. The pixel definition layer can adopt a high-temperature process, with more material selectivity, more stable performance, and lower cost.

[0051] Specifically, such as Figure 2 As shown, since the second sub-layer 232b is filled into the first pixel opening 311, Figure 2 The first pixel opening 311 cannot be seen in the figure, but it can be understood that the first pixel opening 311 formed by the first sub-layer 232a can be determined by the boundary of the first sub-layer 232a. Similarly, the light emitting material layer 233 at least covers the second pixel opening 312. Figure 2 The second pixel opening 312 cannot be seen in the figure, and the second pixel opening 312 formed by the second sub-layer 232b can be determined by the boundary of the second sub-layer 232b.

[0052] Specifically, such as Figure 2 As shown, it can be seen that when the light 26 emitted by the luminescent material layer 233 passes through the second sub-layer 232b and irradiates the contact surface between the second sub-layer 232b and the first sub-layer 232a, since the contact surface between the second sub-layer 232b and the first sub-layer 232a is a total reflection surface, the light is reflected out of the display panel, thereby improving the light output efficiency of the display panel.

[0053] Specifically, such as Figure 1 、 Figure 2 As shown, since the embodiment of the present application forms a microstructured laminated film through the pixel definition layer 232, compared with the existing OLED display device that adds multiple film layers outside the touch layer to form a microstructured laminated film, the present application does not need to add additional film layers, which can reduce the thickness of the OLED display device. Moreover, since the pixel definition layer 232 is arranged in the display panel, the risk of peeling between the pixel definition layer and other film layers is reduced, so that the structure of the first sub-layer and the second sub-layer adopted in the embodiment of the present application can be applied to static bending screens, waterfall screens, dynamic bending screens and four-curved screens, thereby improving the product form adaptability.

[0054] Specifically, such as Figure 1 、 Figure 2As shown, it can be seen that the light will diverge after being emitted from the light-emitting material layer. Therefore, the microstructured laminated film in the existing OLED display device can only extract part of the light, and for downward or large viewing angles, the microstructured laminated film in the existing OLED display device cannot capture or extract the light. In the embodiment of the present application, a pixel definition layer is used to form a microstructured laminated film, which can extract light at a downward angle and light with a large viewing angle, thereby improving the light extraction efficiency and the light output efficiency of the display panel.

[0055] Specifically, such as Figure 1 、 Figure 2 As shown, compared with the existing OLED display device, the microstructure stacked film is formed after the light-emitting material is formed. Therefore, in order to prevent the process from affecting the light-emitting material, the existing process for forming the microstructure stacked film can only use a low-temperature curing process, which makes material development more difficult, has less selectivity, poor stability and high cost. The pixel definition layer in the embodiment of the present application is formed before the light-emitting material layer is formed. Therefore, the process for forming the pixel definition layer will not affect the light-emitting material layer, and a high-temperature process can be used to form the pixel definition layer, which makes the material selectivity wider, the cost lower and the performance more stable.

[0056] In some embodiments, as Figure 2 As shown, the pixel electrode layer 231 includes: a plurality of pixel electrodes 231a arranged in an array, the first pixel openings 311 are provided corresponding to the corresponding pixel electrodes 231a, the second pixel openings 312 are provided corresponding to the corresponding first pixel openings 311, and the area of ​​the second pixel openings 312 is smaller than the area of ​​the first pixel openings 311. By providing the pixel electrodes corresponding to the first pixel openings, the second pixel openings corresponding to the first pixel openings, and the area of ​​the second pixel openings being smaller than the area of ​​the first pixel openings, the first sublayer and the second sublayer can form a contact surface, so that the contact surface formed by the first sublayer and the second sublayer can reflect light emitted by the light-emitting material layer, thereby improving light efficiency.

[0057] In some embodiments, as Figure 2 、 Figure 3As shown, the projection of the second pixel opening 312 on the substrate 21 is located within the projection of the first pixel opening 311 on the substrate 21, and the distance L3 between the second pixel opening 312 and the first pixel opening 311 is in the range of 2 to 4 microns. By ensuring that the projection of the second pixel opening on the substrate is located within the projection of the first pixel opening on the substrate, the first sublayer and the second sublayer can form a contact surface. The contact surface formed by the first and second sublayers can reflect light emitted by the luminescent material layer, thereby improving light efficiency. In addition, the distance between the first and second pixel openings is in the range of 2 to 4 microns, which reduces the thickness through which light passes, thereby reducing light loss and preventing the second sublayer from being too thin, thereby preventing the formation of a total reflection surface.

[0058] Specifically, the width of the first pixel opening is in a range of 5 micrometers to 100 micrometers, and the width of the second pixel opening is in a range of 5 micrometers to 100 micrometers.

[0059] Specifically, the distance between the first pixel opening and the second pixel opening is 3 micrometers.

[0060] Specifically, considering that the cross-sectional shape of the pixel opening may be a trapezoid, the width of the first pixel opening is limited by the width of the opening on the side of the first sublayer close to the pixel electrode layer. Similarly, the width of the second pixel opening is limited by the width of the opening on the side of the second sublayer close to the pixel electrode layer.

[0061] Specifically, the display panel includes a plurality of pixel units, each pixel unit includes at least a red sub-pixel, a blue sub-pixel and a green sub-pixel. Figure 3 As shown, the first pixel opening 311 includes a first green pixel opening 411 corresponding to a green sub-pixel, a first red pixel opening 412 corresponding to a red sub-pixel, and a first blue pixel opening 413 corresponding to a blue sub-pixel. The second pixel opening 312 includes a second green pixel opening 421 corresponding to a green sub-pixel, a second red pixel opening 422 corresponding to a red sub-pixel, and a second blue pixel opening 423 corresponding to a blue sub-pixel. Figure 3 As can be seen in the figure, the areas of the first pixel opening and the second pixel opening corresponding to different sub-pixels are different. It is understandable that, due to the different luminous efficiencies of different sub-pixels, when forming the pixel openings corresponding to different sub-pixels, the areas of the pixel openings corresponding to different sub-pixels can be made different. For example, if the area of ​​the blue sub-pixel is larger than the area of ​​the green sub-pixel, the area of ​​the first blue pixel opening can be made larger than the area of ​​the first green pixel opening, and the area of ​​the second blue pixel opening can be made larger than the area of ​​the second green pixel opening. However, the embodiments of the present application are not limited thereto, and the areas of the pixel openings can be set accordingly based on different pixel designs.

[0062] Specifically, the spacing between the second pixel openings and the first pixel openings corresponding to different sub-pixels can be made the same, for example, the spacing between the first blue pixel opening and the second blue pixel opening is equal to the spacing between the first green pixel opening and the second green pixel opening. The spacing between the second pixel openings and the first pixel openings corresponding to different sub-pixels can also be made different, for example, the spacing between the first blue pixel opening and the second blue pixel opening is greater than or smaller than the spacing between the first green pixel opening and the second green pixel opening.

[0063] In some embodiments, as Figure 3 As shown, the shape of the first pixel opening 311 is the same as the shape of the second pixel opening 312, so that the reflection surface formed by the first pixel opening and the second pixel opening is relatively flat, and the reflection effect on light is better. Figure 3 The shapes of the first pixel opening 311 and the second pixel opening 312 are both rhombus-shaped, but the embodiment of the present application is not limited thereto, and the shapes of the first pixel opening and the second pixel opening can be other shapes.

[0064] In some embodiments, as Figure 2 As shown, the second sublayer 232b is close to the first lower surface 511 of the substrate 21 and contacts at least a portion of the second upper surface 512 of the first sublayer 232a away from the substrate 21, and contacts at least a portion of the third upper surface 513 of the pixel electrode 231a away from the substrate 21. By overlapping the second sublayer on the first sublayer, the second sublayer and the first sublayer are in direct contact to form a reflective surface, which improves light extraction. The second sublayer is overlapped on the pixel electrode, so that the luminescent material is arranged corresponding to the pixel electrode. The reflective surface formed by the first and second sublayers can reflect light emitted by the luminescent material, thereby improving light extraction.

[0065] In some embodiments, as Figure 2 As shown, the first sublayer 232a forms a first angle A1 with the pixel electrode layer 231, and the second sublayer 232b forms a second angle A2 with the pixel electrode layer 231, wherein the first angle A1 is greater than or equal to the second angle A2. By making the first angle greater than the second angle, light can be irradiated onto the reflective surfaces of the first and second sublayers, improving light extraction. By making the angle formed by the first sublayer and the pixel electrode layer equal to the angle formed by the second sublayer and the pixel electrode layer, the contact surface between the second and first sublayers is smooth, and the total reflection surface formed by the second and first sublayers has a better light extraction effect, thereby improving the light extraction efficiency of the display panel.

[0066] Specifically, since the angle formed by the first sublayer and the pixel electrode layer includes an acute angle and an obtuse angle, the embodiment of the present application defines the acute angle formed by the first sublayer and the pixel electrode layer as the first angle. Similarly, the acute angle formed by the second sublayer and the pixel electrode layer is the second angle.

[0067] In some embodiments, the first angle ranges from 20 degrees to 60 degrees, and the second angle ranges from 20 degrees to 60 degrees.

[0068] Specifically, to prevent the second sublayer from breaking when it overlaps the side of the first sublayer, the first angle can be made smaller so that when the second sublayer is formed, the second sublayer can overlap the first sublayer to avoid breaking the second sublayer. In addition, to prevent the first angle from being too small, causing the light to diverge and fail to illuminate the contact surface between the first and second sublayers, the first angle can be made relatively large, so that the value range of the first angle is 20 degrees to 60 degrees. When setting the second sublayer, the angle of the second sublayer is made the same as the angle of the first sublayer, which can prevent breakage when the subsequent film layer is formed and can also prevent the angle from being too small to cause the light to be unable to reflect. Therefore, the range of the first angle and the second angle is 20 degrees to 60 degrees, so that the light extraction efficiency of the display panel is higher.

[0069] In some embodiments, the difference between the refractive index of the second sublayer and the refractive index of the first sublayer is in a range of 0.1 to 0.15. By setting the difference between the refractive index of the second sublayer and the refractive index of the first sublayer in a range of 0.1 to 0.15, the total reflection surface formed by the first sublayer and the second sublayer can effectively extract light, thereby improving the light extraction efficiency of the display panel and avoiding excessive light scattering caused by an excessively large difference in the refractive index of the first sublayer and the second sublayer, thereby improving the light efficiency of the display panel.

[0070] In some embodiments, the refractive index of the first sublayer is in a range of 1.4 to 1.55, and the refractive index of the second sublayer is in a range of 1.55 to 1.85. By setting the refractive index of the first sublayer in a range of 1.4 to 1.55 and the refractive index of the second sublayer in a range of 1.55 to 1.85, the total internal reflection surface formed by the first and second sublayers has a better light reflection effect, thereby improving the light extraction efficiency of the display panel.

[0071] Specifically, as an introduction to the embodiments of the present application, a comparative display device is provided herein, such as Figure 5As shown, the comparative display device includes a substrate 61, an array film 62, a light-emitting film 63, a packaging film 64 and a circular polarizer 65. The light-emitting film 63 includes a reflective anode 631, a pixel definition film 632, an organic material 633 and a transparent cathode 634. The circular polarizer 65 includes a linear polarizer 651 and a quarter-wave plate 652. By providing the circular polarizer, the influence of external incident light is prevented, thereby improving the display effect of the comparative display device. Figure 6 As shown, it can be seen that when external light 661 at various angles is irradiated onto the comparative display device, the linear polarizing film 651 allows the light at an angle parallel to the light transmission axis of the linear polarizing film 651 to pass through ( Figure 6 (The example uses the left-right transmission axis as an example for illustration.) Light at other angles will be blocked by the linear polarizing film 651. Then, after the external light 661 strikes the quarter-wave plate 652, it will be converted into circularly polarized light. After striking the reflective anode 631, the circularly polarized light will be reflected back to the quarter-wave plate 652. At this time, the quarter-wave plate 652 will convert the circularly polarized light into light perpendicular to the transmission axis of the linear polarizing film 651, preventing the light from passing through the linear polarizing film 651. This absorbs the external light and reduces the reflectivity of the contrast display device. However, the thickness of the circular polarizer is approximately 50 to 100 microns, which will increase the thickness of the contrast display device and lose some of the emitted light.

[0072] In order to solve the problem of large thickness and light loss in the contrast display device using circular polarizer, the embodiment of the present application provides another contrast display device, such as Figure 6 As shown, the contrast display device adopts PLP (Pol Less Panel) technology, and replaces the circular polarizer with a filter film 67, thereby reducing the thickness of the contrast display device, improving the brightness of the contrast display device and reducing power consumption.

[0073] Specifically, such as Figure 6 As shown, the filter film 67 includes a black matrix 671 and a color-resist film 672. When external light 661 strikes the filter film 67, some of the light strikes the black matrix 671, and some strikes the color-resist film 672. The light striking the black matrix 671 is absorbed by the black matrix 671, which has a light absorption rate of approximately 99.75%. Even if some of the light passes through the black matrix 671 and strikes the reflective anode 631, it will be absorbed again by the black matrix 671 upon reflection. This results in virtually no light being reflected from the contrast display device after the external light 661 strikes the black matrix. However, because the color-resist film 672 is required to be light-transmissive, some of the external light striking the color-resist film 672 will pass through the color-resist film 672 and, after being reflected by the reflective anode 631, be reflected from the color-resist film 672 out of the contrast display device. This results in a higher reflectivity of the contrast display device, resulting in a poor display effect.

[0074] like Figure 7 As shown, the array film 62 includes a metal film 621, the packaging film 64 includes a first packaging film 641, a second packaging film 642 and a third packaging film 643, the comparative display device further includes an insulating film 681, and the color resist film 672 includes a red color resist film 672a. Figure 7 The light path diagram when the external light 661 irradiates the red color resist film 672a is used for description. It can be understood that when the external light 661 irradiates the green color resist film and the blue color resist film, the following description can be referred to.

[0075] from Figure 7 As can be seen in the figure, the external light 661 includes red light, green light and blue light. When passing through the red color-resistance film 672a, only the red light in the external light 661 passes through. After passing through each film layer of the contrast display device in sequence, the red light in the external light 661 will irradiate the reflective anode 631 and the metal film 621, and then be reflected from the other red color-resistance film 672a to exit the contrast display device, resulting in a higher reflectivity of the contrast display device and a poor display effect.

[0076] Based on the above technical problems, this application provides some embodiments to solve the above technical problems.

[0077] In some embodiments, the second sublayer comprises a transparent material, and the first sublayer comprises a transparent material or a non-transparent material. By making the second sublayer a transparent material, light emitted by the luminescent material layer can pass through the second sublayer to reach the interface between the first and second sublayers, thereby extracting the light and improving the light extraction efficiency of the display panel. The first sublayer can be made of either a transparent material or a non-transparent material, as the difference in refractive index between the first and second sublayers forms a total reflection surface.

[0078] Specifically, the material of the second sub-layer includes transparent organic photoresist, and the material of the first sub-layer includes organic photoresist.

[0079] Specifically, the material of the first sublayer can be a non-transparent material, so that after light passes through the second sublayer, it will not pass through the first sublayer, avoiding the light from irradiating downward to the thin film transistor and causing electrical deviation of the thin film transistor, thereby improving the stability of the thin film transistor.

[0080] Specifically, the embodiment of the present application makes the material of the second sublayer include a transparent material and the material of the first sublayer include a non-transparent material, so that the light emitted by the luminescent material layer can pass through the second sublayer and be emitted normally, and the light extraction efficiency is improved through the cooperation of the first sublayer and the second sublayer. The first sublayer can prevent the light emitted by the luminescent material from affecting the performance of the thin film transistor, and when external light shines on the luminescent functional layer, the second sublayer can absorb the light and reduce the reflectivity of the display panel, thereby improving the light extraction effect of the display panel without increasing the thickness of the display panel, thereby reducing the reflection of light by the display panel and improving the display effect.

[0081] In some embodiments, as Figure 8 As shown, the material of the first sublayer 232a includes a black material. By making the material of the first sublayer include a black material, the interface formed by the first sublayer and the second sublayer can improve the light extraction efficiency of the display panel, and the first sublayer can absorb external light, thereby reducing the reflection of external light by the display panel and improving the display effect.

[0082] Specifically, the material of the first sub-layer includes polymethacrylic resin.

[0083] In some embodiments, as Figure 2 、 Figure 8 As shown, the thickness L1 of the first sublayer 232a is greater than the thickness L2 of the second sublayer 232b. By making the thickness of the first sublayer greater than the thickness of the second sublayer, when external light is reflected by the pixel electrode layer, the second sublayer can absorb more light, thereby further reducing the reflection of external light by the display panel and improving the display effect.

[0084] In some embodiments, as Figure 8 As shown, the light-emitting functional layer 23 further includes a common electrode layer 234, and the thickness L1 of the first sublayer 232a is greater than or equal to the sum L2 of the thicknesses of the pixel electrode layer 231, the light-emitting material layer 233, and the common electrode layer 234. By ensuring that the thickness of the first sublayer is greater than or equal to the sum of the thicknesses of the pixel electrode layer, the light-emitting material layer, and the common electrode layer, when external light is reflected by the pixel electrode layer, the second sublayer can absorb more light, thereby further reducing the reflection of external light by the display panel and improving the display effect.

[0085] Specifically, such as Figure 10 As shown, it can be seen that when the external light 661 passes through the color block and is incident on the pixel electrode layer 231, it will be reflected by the pixel electrode 231, and the reflected light may pass through the pixel definition layer. Therefore, when the thickness of the first sub-layer is increased, more reflected light can be irradiated to the first sub-layer and then absorbed by the first sub-layer, thereby further reducing the reflected light and improving the display effect.

[0086] Specifically, when the first sublayer is a non-transparent material, or even a black material, although the interface between the first sublayer and the second sublayer can still reflect light, considering that the first sublayer will also absorb light, the thickness of the first sublayer can be determined according to the actual light angle, thereby taking into account both the light extraction efficiency of the display panel and the effect of reducing the reflected light of the display panel.

[0087] In some embodiments, as Figure 8 As shown, the display panel 2 further includes a filter layer 28, which includes a plurality of color resists 282 and a black matrix 281 disposed between the color resists 282. The pixel definition layer 232 is disposed corresponding to the black matrix 281, and a gap exists between the edge of the black matrix 281 and the edge of the first sublayer 232a. By including the filter layer in the display panel, the filter layer can prevent the display panel from reflecting external light, and the thickness of the display panel is smaller than that of a display panel using a circular polarizer. By providing a gap between the edge of the black matrix and the edge of the first sublayer, the black matrix can be prevented from blocking the light emitted by the light-emitting functional layer, thereby improving the light extraction efficiency of the display panel.

[0088] Specifically, the color resist may include red color resist, green color resist and blue color resist.

[0089] Specifically, for a display panel using a filter layer, by making the pixel definition layer include a first sublayer and a second sublayer, the material of the first sublayer can be a black material. Then, when external light passes through the color resistor, part of the light can be absorbed and blocked by the first sublayer, and the first sublayer and the second sublayer can still form a total reflection surface, so that the light emitted by the luminescent material layer can be emitted, thereby improving the light output efficiency of the display panel. Moreover, this solution can reduce the thickness of the display panel, improve the light output efficiency of the display panel, and reduce the reflectivity of the display panel to external light, thereby improving the display effect.

[0090] In some embodiments, as Figure 9 As shown, the distance L6 between the edge of the black matrix 281 and the edge of the second sub-layer 232b ranges from 2 microns to 4 microns, and the distance L5 between the edge of the first sub-layer 232a and the edge of the second sub-layer 232b ranges from 1 micron to 3 microns. By setting the distance between the edge of the black matrix and the second sub-layer to be in the range of 2 microns to 4 microns, light emitted by the display panel can be emitted from the openings of the black matrix, thereby improving the light extraction effect of the display panel. By setting the distance between the edge of the second sub-layer and the first sub-layer to be in the range of 1 micron to 3 microns, light emitted by the luminescent material layer can pass through the pixel definition layer, thereby improving the light extraction effect of the display panel.

[0091] Specifically, it can be understood that the distance between the edge of the first sub-layer and the edge of the second sub-layer may be the distance between the first pixel opening and the second pixel opening.

[0092] Specifically, such as Figure 10 As shown, taking the red color resist 282a as an example, when the external light 661 is irradiated to the red color resist 282a, the green light and the blue light cannot pass through the red color resist. After the red light passes through the red color resist 282a, part of the light will directly irradiate the pixel electrode layer 231, and part of the light will irradiate the pixel definition layer. In the comparative display device, part of the light will pass through the pixel definition layer and irradiate the pixel electrode layer and then be reflected, and the other part of the light will pass through the pixel definition layer and irradiate the metal layer and be reflected. In the embodiment of the present application, when the first sublayer is a non-transparent material, specifically a black material, it will directly absorb the light irradiated to the pixel definition layer, thereby reducing the light reflected from the display panel, reducing the reflectivity of the display panel to external light, and improving the display effect.

[0093] In some embodiments, the material of the first sublayer includes one of acrylic resin, epoxy resin, phenol resin, and polyamide resin, and the material of the second sublayer includes one of acrylic resin, epoxy resin, phenol resin, and polyamide resin. By forming a total reflection surface at the interface between the first and second sublayers, and by using a high-temperature process to form the first and second sublayers, a wider range of material options are available for the first and second sublayers, and their performance is more stable.

[0094] Specifically, for acrylic resin, epoxy resin, phenol resin, and polyamide resin, since the above resins are a resin system, the properties of each resin can be changed by adjusting the dopants or groups within each system. For example, the first sub-layer formed is opaque, but the second sub-layer formed is transparent, thereby achieving different functions of different film layers.

[0095] In some embodiments, as Figure 2 As shown, the light-emitting functional layer 23 further includes a common electrode layer 234. The thickness L1 of the first sublayer 232a is greater than or equal to the thickness L2 of the second sublayer 232b, and the thickness of the pixel definition layer 232 is greater than the sum L4 of the thicknesses of the pixel electrode layer 231, the light-emitting material layer 233, and the common electrode layer 234. By ensuring that the thickness of the first sublayer is equal to the thickness of the second sublayer, and the thickness of the pixel definition layer is greater than the sum of the thicknesses of the pixel electrode layer, the light-emitting material layer, and the common electrode layer, the light-emitting material layer is prevented from overflowing from the corresponding second pixel opening, thereby improving the uniformity of the display panel.

[0096] Specifically, the above embodiment is described by taking the example that the thickness of the first sub-layer is equal to the thickness of the second sub-layer, but the embodiments of the present application are not limited thereto, and the thicknesses of the first sub-layer and the second sub-layer may be different.

[0097] Specifically, the above embodiment is described by taking the example that the thickness of the pixel definition layer is greater than the sum of the thicknesses of the pixel electrode layer, the light-emitting material layer and the common electrode layer, but the embodiments of the present application are not limited to this. For example, the thickness of the pixel definition layer can be equal to the sum of the thicknesses of the pixel electrode layer, the light-emitting material layer and the common electrode layer, so that the thickness of the pixel definition layer is smaller and the height difference between different areas of the common electrode layer is smaller, thereby avoiding breakage of the common electrode layer.

[0098] Specifically, the thickness of the first sub-layer ranges from 0.3 micrometers to 5 micrometers.

[0099] Specifically, the thickness of the second sub-layer ranges from 0.3 micrometers to 5 micrometers.

[0100] Specifically, such as Figure 8 As shown, the substrate 21 includes a first flexible layer 211 , a first barrier layer 212 , a second flexible layer 213 and a second barrier layer 214 .

[0101] Specifically, such as Figure 2 As shown, the driving circuit layer 22 includes a thin film transistor array layer 221 and a planarization layer 222 .

[0102] Specifically, such as Figure 8 As shown, the driving circuit layer 22 includes a buffer layer 271, an active layer 272, a first gate insulating layer 273, a first metal layer 274, a second gate insulating layer 275, an interlayer insulating layer 276, a first source and drain layer 277, a first planarization layer 278, a second source and drain layer 279 and a second planarization layer 280.

[0103] Specifically, the thin film transistor array layer 221 includes a buffer layer, an active layer, a first gate insulating layer, a first metal layer, a second gate insulating layer, a second metal layer, an interlayer insulating layer and a source / drain layer, which are arranged in sequence.

[0104] Specifically, such as Figure 2 As shown, the display panel further includes an encapsulation layer 24 and a touch layer 25 .

[0105] Specifically, the encapsulation layer includes a first inorganic layer, an organic layer and a second inorganic layer.

[0106] Specifically, such as Figure 8 As shown, the encapsulation layer 24 includes a first inorganic layer 241 , an organic layer 242 and a second inorganic layer 243 which are sequentially arranged.

[0107] Specifically, the touch layer includes a first electrode layer, an insulating layer and a second electrode layer.

[0108] Specifically, such as Figure 8 As shown, the touch layer 25 includes a first insulating layer 251 , a first electrode layer 252 , a second insulating layer 253 and a second electrode layer 254 .

[0109] Specifically, such as Figure 8 As shown, the display panel 2 further includes a flat layer 291 , an optical adhesive layer 292 and a cover plate 293 .

[0110] The above embodiments provide detailed descriptions of the design of the display panel from various structural perspectives. It is understood that, when there is no conflict between the embodiments, the embodiments can be combined to achieve better technical effects. For example, the first sub-layer forms a first angle with the pixel electrode layer, the second sub-layer forms a second angle with the pixel electrode layer, the first angle is equal to the second angle, and the difference between the refractive index of the second sub-layer and the refractive index of the first sub-layer is in a range of 0.1 to 0.15. For example, the material of the first sub-layer includes a black material, and the shape of the first pixel opening is the same as the shape of the second pixel opening.

[0111] At the same time, an embodiment of the present application provides a method for manufacturing a display panel, the method for manufacturing a display panel comprising:

[0112] Provide a substrate, and form a driving circuit layer on the substrate; the structure of the display panel corresponding to this step is as follows Figure 4 As shown in (a);

[0113] The pixel electrode layer and the first sub-layer are formed on the driving circuit layer; the structure of the display panel corresponding to this step is as follows Figure 4 As shown in (a);

[0114] The first sub-layer is patterned by an exposure and development process, and a first pixel opening is formed in the region corresponding to the pixel electrode layer to expose the pixel electrode layer; the structure of the display panel corresponding to this step is as follows: Figure 4 As shown in (b);

[0115] A second sublayer is formed by coating on the first sublayer, and the second sublayer is patterned using an exposure and development process, and a second pixel opening is formed in the area corresponding to the pixel electrode layer to expose the pixel electrode layer; the structure of the display panel corresponding to this step is as follows Figure 4 As shown in (c);

[0116] A light-emitting material layer, a common electrode layer, an encapsulation layer, and a touch layer are sequentially formed on the second sub-layer; the structure of the display panel corresponding to this step is as follows: Figure 2 shown.

[0117] At the same time, an embodiment of the present application provides a display device, which includes the display panel as described in any of the above embodiments.

[0118] According to the above embodiments, it can be seen that:

[0119] An embodiment of the present application provides a display panel and a display device, which display panel includes a substrate, a driving circuit layer and a light-emitting function layer, the driving circuit layer is arranged on one side of the substrate, the light-emitting function layer is arranged on a side of the driving circuit layer away from the substrate, the light-emitting function layer includes a pixel electrode layer, a light-emitting material layer and a pixel definition layer, the pixel electrode layer is arranged on a side of the driving circuit layer away from the substrate, the pixel definition layer is arranged on a side of the pixel electrode layer away from the driving circuit layer, and the light-emitting material layer is arranged on a side of the pixel electrode layer away from the driving circuit layer, wherein the pixel definition layer includes a first sublayer and a second sublayer, the first sublayer is arranged on a side of the pixel electrode layer away from the driving circuit layer, the first sublayer includes a first pixel opening, the second sublayer is arranged on a side of the first sublayer away from the pixel electrode layer and extends into the first pixel opening, the second sublayer includes a second pixel opening, the light-emitting material layer at least covers the second pixel opening, and the refractive index of the second sublayer is greater than the refractive index of the first sublayer. In the present application, the pixel definition layer includes a first sublayer and a second sublayer, and the second sublayer extends into the first pixel opening. The refractive index of the second sublayer is greater than the refractive index of the first sublayer. Then, the contact surface of the first sublayer and the second sublayer forms a total reflection surface, so that the light emitted by the luminescent material layer will be reflected out of the display panel when it hits the contact surface of the first sublayer and the second sublayer, thereby improving the light extraction efficiency of the display panel. In addition, a microstructured laminated film is formed by the pixel definition layer without the need for additional film layers, thereby reducing the thickness of the display panel. The microstructured laminated film formed by the pixel definition layer is closer to the luminescent material layer, and can improve the light extraction efficiency compared to the external microstructured laminated film. In addition, the pixel definition layer can adopt a high-temperature process, with more material selectivity, more stable performance, and lower cost.

[0120] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0121] The above is a detailed introduction to a display panel and a display device provided in the embodiments of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the technical solutions and core ideas of the present application. Ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A display panel, characterized in that: include: substrate; A driving circuit layer is provided on one side of the substrate; a light-emitting functional layer, disposed on a side of the driving circuit layer away from the substrate, the light-emitting functional layer comprising a pixel electrode layer, a light-emitting material layer, and a pixel definition layer, the pixel electrode layer being disposed on a side of the driving circuit layer away from the substrate, the pixel definition layer being disposed on a side of the pixel electrode layer away from the driving circuit layer, and the light-emitting material layer being disposed on a side of the pixel electrode layer away from the driving circuit layer; The pixel definition layer includes a first sublayer and a second sublayer, the first sublayer is arranged on a side of the pixel electrode layer away from the driving circuit layer, the first sublayer includes a first pixel opening, the second sublayer is arranged on a side of the first sublayer away from the pixel electrode layer and extends into the first pixel opening, the second sublayer includes a second pixel opening, the light-emitting material layer at least covers the second pixel opening, and the refractive index of the second sublayer is greater than the refractive index of the first sublayer; The material of the second sub-layer includes a transparent material, and the material of the first sub-layer includes a black material.

2. The display panel according to claim 1, wherein The thickness of the first sub-layer is greater than the thickness of the second sub-layer.

3. The display panel according to claim 2, wherein: The light-emitting functional layer further includes a common electrode layer, and the thickness of the first sublayer is greater than or equal to the sum of the thicknesses of the pixel electrode layer, the light-emitting material layer, and the common electrode layer.

4. The display panel according to claim 1, wherein: The display panel further includes a filter layer including a plurality of color resists and a black matrix disposed between the color resists. The pixel definition layer is disposed corresponding to the black matrix, and a distance exists between an edge of the black matrix and an edge of the first sublayer.

5. The display panel according to claim 4, wherein: The distance between the edge of the black matrix and the edge of the second sub-layer ranges from 2 micrometers to 4 micrometers, and the distance between the edge of the first sub-layer and the edge of the second sub-layer ranges from 1 micrometer to 3 micrometers.

6. The display panel according to any one of claims 1 to 5, wherein: The pixel electrode layer includes: a plurality of pixel electrodes arranged in an array, the first pixel openings are set corresponding to the corresponding pixel electrodes, the second pixel openings are set corresponding to the corresponding first pixel openings, and the area of ​​the second pixel openings is smaller than the area of ​​the first pixel openings.

7. The display panel according to claim 6, wherein: The shape of the first pixel opening is the same as the shape of the second pixel opening.

8. The display panel according to claim 7, wherein: The second sublayer is close to the first lower surface of the substrate and contacts at least a portion of the first sublayer's second upper surface away from the substrate, and contacts at least a portion of the pixel electrode's third upper surface away from the substrate.

9. The display panel according to any one of claims 1 to 5, wherein: The first sub-layer and the pixel electrode layer form a first angle, the second sub-layer and the pixel electrode layer form a second angle, and the first angle is greater than or equal to the second angle.

10. The display panel according to claim 9, wherein: The first angle ranges from 20 degrees to 60 degrees.

11. The display panel according to claim 1, wherein: The refractive index of the first sub-layer ranges from 1.4 to 1.55, and the refractive index of the second sub-layer ranges from 1.55 to 1.

85.

12. The display panel according to claim 11, wherein: The difference between the refractive index of the second sub-layer and the refractive index of the first sub-layer ranges from 0.1 to 0.

15.

13. The display panel according to claim 1, wherein The light-emitting functional layer also includes a common electrode layer, the thickness of the first sublayer is greater than or equal to the thickness of the second sublayer, and the thickness of the pixel definition layer is greater than the sum of the thicknesses of the pixel electrode layer, the light-emitting material layer and the common electrode layer.

14. The display panel according to claim 1, wherein: The pixel electrode layer includes: a plurality of pixel electrodes arranged in an array, the first pixel openings are set corresponding to the corresponding pixel electrodes, the second pixel openings are set corresponding to the corresponding first pixel openings, the area of ​​the second pixel openings is smaller than the area of ​​the first pixel openings, the projection of the second pixel openings on the substrate is located within the projection of the first pixel openings on the substrate, and the spacing between the second pixel openings and the first pixel openings is in the range of 2 to 4 microns.

15. A display device, characterized in that: The display panel comprises the display panel according to any one of claims 1 to 14.

Images