CN116390586A - Display panel and display device - Google Patents

Abstract

The disclosure provides a display panel and a display device, which belong to the technical field of display, wherein the display panel comprises a substrate base plate and a plurality of pixel units positioned on the substrate base plate; the pixel unit comprises a plurality of sub-pixels; the plurality of sub-pixels includes a first sub-pixel, a second sub-pixel, a third sub-pixel, and a fourth sub-pixel; the maximum opening width of the pixel opening of the first sub-pixel along the row direction is the same as the maximum opening width of the pixel opening of the fourth sub-pixel along the row direction; the maximum opening width of the pixel opening of the first sub-pixel along the column direction is the same as the maximum opening width of the pixel opening of the second sub-pixel along the column direction; the maximum opening width of the pixel opening of the fourth sub-pixel along the column direction is the same as the maximum opening width of the pixel opening of the third sub-pixel along the column direction; the maximum opening width of the pixel opening of the second sub-pixel along the row direction is the same as the maximum opening width of the pixel opening of the third sub-pixel along the row direction.

Description

Display panel and display device

Technical Field

The disclosure belongs to the technical field of display, and particularly relates to a display panel and a display device.

Background

With the continuous development of display technology, the requirement for resolution of a display is continuously increased, however, the requirement for high resolution display increases the difficulty of the production process and increases the production cost. In order to reduce the difficulty of the production process and the cost at present, the pixel arrangement can adopt a pixel borrowing mode, and according to the difference of resolutions of human eyes on sub-pixels with different colors (the human eyes are most sensitive to the perception of green sub-pixels), the pixel arrangement generally adopts an arrangement mode that the resolutions of red sub-pixels and blue sub-pixels are lower than the resolutions of real red sub-pixels and blue sub-pixels, and the resolution of the green sub-pixels is unchanged, for example, a diamond pixel arrangement mode.

However, the pixel arrangement design needs to satisfy various constraints, such as: because the luminous materials of the sub-pixels with different colors have different efficiency and service life, the luminous areas of the sub-pixels with different colors are also different, and a certain proportion is required to be met; and, the area of the light emitting region needs to be designed as large as possible, that is, the opening of the sub-pixel occupies the whole sub-pixel area as much as possible, so as to ensure the service life of the device, etc. Therefore, how to reasonably design the pixel arrangement is a problem to be solved in the display field.

Disclosure of Invention

The present disclosure is directed to at least solving one of the technical problems in the prior art, and provides a display panel and a display device.

In a first aspect, a technical solution adopted to solve the technical problem of the present disclosure is a display panel, which includes a substrate and a plurality of pixel units located on the substrate; the pixel unit comprises a plurality of sub-pixels; the plurality of sub-pixels comprise a first sub-pixel, a second sub-pixel, a third sub-pixel and a fourth sub-pixel, the colors of the first sub-pixel, the second sub-pixel and the third sub-pixel are different, and the colors of the second sub-pixel and the fourth sub-pixel are the same;

the first sub-pixels and the second sub-pixels are alternately arranged along the row direction to form a plurality of rows of first pixel rows, and the first sub-pixels and the fourth sub-pixels are alternately arranged along the column direction to form a plurality of columns of first pixel columns; the fourth sub-pixel and the third sub-pixel are alternately arranged along the row direction to form a plurality of rows of second pixel rows, and the second sub-pixel and the third sub-pixel are alternately arranged along the column direction to form a plurality of columns of second pixel columns;

the maximum opening width of the pixel opening of the first sub-pixel along the row direction is the same as the maximum opening width of the pixel opening of the fourth sub-pixel along the row direction; the maximum opening width of the pixel opening of the first sub-pixel along the column direction is the same as the maximum opening width of the pixel opening of the second sub-pixel along the column direction; the maximum opening width of the pixel opening of the fourth sub-pixel along the column direction is the same as the maximum opening width of the pixel opening of the third sub-pixel along the column direction; the maximum opening width of the pixel opening of the second sub-pixel along the row direction is the same as the maximum opening width of the pixel opening of the third sub-pixel along the row direction.

In some embodiments, the outline shape of the orthographic projection of the pixel opening of the first sub-pixel on the substrate is rectangular, the outline shape of the orthographic projection of the pixel opening of the second sub-pixel on the substrate is rectangular, the outline shape of the orthographic projection of the pixel opening of the third sub-pixel on the substrate is rectangular, and the outline shape of the orthographic projection of the pixel opening of the fourth sub-pixel on the substrate is rectangular;

one side of the pixel opening, which is away from the substrate base plate, comprises a first side and a second side which are oppositely arranged along the row direction, and a third side and a fourth side which are oppositely arranged along the column direction;

the length of the third side of the pixel opening of the first sub-pixel is the same as the length of the third side of the pixel opening of the fourth sub-pixel; the length of the first edge of the pixel opening of the first sub-pixel is the same as the length of the first edge of the pixel opening of the second sub-pixel; the length of the first edge of the pixel opening of the fourth sub-pixel is the same as the length of the first edge of the pixel opening of the third sub-pixel; the length of the third side of the pixel opening of the second sub-pixel is the same as the length of the third side of the pixel opening of the third sub-pixel.

In some embodiments, a sum of a maximum area of the pixel opening of the first sub-pixel and a maximum area of the pixel opening of the third sub-pixel is greater than or equal to a sum of a maximum area of the pixel opening of the second sub-pixel and a maximum area of the pixel opening of the fourth sub-pixel.

In some embodiments, the first subpixel is a red subpixel; the second sub-pixel and the fourth sub-pixel are green sub-pixels; the doping material of the light-emitting layer of the red sub-pixel is a platinum complex or a gold complex; the doping material of the light-emitting layer of the green sub-pixel is a platinum complex or a gold complex.

In some embodiments, the third subpixel is a blue subpixel; the main material of the light-emitting layer of the blue sub-pixel is a phosphorescent material or a deuterium-band fluorescent material.

In some embodiments, for one of the pixel units, an aperture ratio between the red, green, and blue sub-pixels is one of 1:1:2, 1:1:1.7, 1:1.2:2, 1:1.2:1.8.

In some embodiments, the first subpixel is a red subpixel, the second subpixel and the fourth subpixel are green subpixels, and the third subpixel is a blue subpixel;

The ratio of the aperture ratio of the blue sub-pixel to the aperture ratio of the red sub-pixel is greater than 2.8, and the ratio of the aperture ratio of the blue sub-pixel to the aperture ratio of the green sub-pixel is greater than 2.8.

In some embodiments, the first subpixel is a red subpixel, the second subpixel and the fourth subpixel are green subpixels, and the third subpixel is a blue subpixel; the first subpixel, the second subpixel, the third subpixel, and the fourth subpixel each include a plurality of light emitting layers;

the ratio of the aperture ratio of the blue sub-pixel to the aperture ratio of the red sub-pixel is greater than 3.5, and the ratio of the aperture ratio of the blue sub-pixel to the aperture ratio of the green sub-pixel is greater than 3.5.

In some embodiments, the ratio of the aperture ratio of the red sub-pixel and the ratio of the aperture ratio of the blue sub-pixel are the same.

In some embodiments, for one of the pixel units, an aperture ratio between the red, green, and blue sub-pixels is 1:1.4:2.

In some embodiments, for one of the pixel units, an aperture ratio between the red, green, and blue sub-pixels is 1:1:1.2.

In some embodiments, for one of the pixel units, an aperture ratio between the red, green and blue sub-pixels is 1:0.8:2.2.

In some embodiments, the display panel further comprises a light extraction structure disposed on a side of the pixel unit facing away from the substrate; the light extraction structure comprises a first low refractive index layer, a high refractive index layer and a second low refractive index layer which are sequentially arranged along the direction of the substrate to the pixel unit, wherein the refractive indexes of the first low refractive index layer and the second low refractive index layer are smaller than those of the high refractive index layer.

In a second aspect, embodiments of the present disclosure further provide a display device including the display panel according to any one of the above embodiments.

Drawings

FIG. 1a is a schematic diagram of an exemplary pixel arrangement of the prior art;

FIG. 1b is a schematic diagram of another exemplary pixel arrangement in the prior art;

fig. 2 is a schematic diagram of a display panel with a single device structure according to an embodiment of the disclosure;

FIG. 3a is a schematic diagram of an exemplary partial pixel arrangement provided by an embodiment of the present disclosure;

FIG. 3b is a schematic diagram of an exemplary overall arrangement of pixels provided in accordance with an embodiment of the present disclosure;

FIG. 4a is a schematic diagram of an example one life curve provided by an embodiment of the present disclosure;

FIG. 4b is a schematic diagram of a life curve of example two provided by an embodiment of the present disclosure;

FIG. 4c is a schematic illustration of a life curve of example three provided by an embodiment of the present disclosure;

FIG. 4d is a schematic illustration of a life curve of example four provided by an embodiment of the present disclosure;

FIG. 4e is a schematic illustration of an example five life curve provided by an embodiment of the present disclosure;

FIG. 4f is a schematic illustration of a life curve of example six provided by an embodiment of the present disclosure;

FIG. 4g is a schematic illustration of an example seven life curve provided by an embodiment of the present disclosure;

FIG. 4h is a schematic illustration of an example eight life curve provided by an embodiment of the present disclosure;

FIG. 4i is a schematic illustration of an example nine life curve provided by an embodiment of the present disclosure;

FIG. 5 is a schematic diagram of an exemplary low gray-scale tailing phenomenon provided by embodiments of the present disclosure;

FIG. 6 is a schematic diagram illustrating a threshold voltage variation situation when switching between low gray levels and high gray levels according to an embodiment of the present disclosure;

fig. 7 is a schematic diagram of a display panel with a tan device structure as an example according to an embodiment of the disclosure;

FIG. 8 is a schematic diagram of the relationship between brightness and voltage provided by an embodiment of the present disclosure;

Fig. 9a is a schematic diagram between the on current and the voltage of a red light emitting device according to an embodiment of the present disclosure;

FIG. 9b is a schematic diagram of the green light emitting device according to the embodiment of the present disclosure between the on current and the voltage;

FIG. 9c is a schematic diagram of the blue light emitting device according to the embodiments of the present disclosure between the on-current and the voltage;

FIG. 10a is a schematic diagram of voltage versus luminance of a red light emitting device according to an embodiment of the present disclosure;

FIG. 10b is a schematic diagram of the voltage versus luminance of a green light emitting device provided by an embodiment of the present disclosure;

FIG. 10c is a schematic diagram of the voltage versus luminance of a blue light emitting device according to an embodiment of the present disclosure;

FIG. 11 is a schematic view of a light extraction structure provided by an embodiment of the present disclosure;

fig. 12 is a schematic diagram of a TFT characteristic-OLED luminance-temperature variation curve in an embodiment of the present disclosure.

Detailed Description

For the purposes of making the objects, technical solutions and advantages of the embodiments of the present disclosure more apparent, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure, and it is apparent that the described embodiments are only some embodiments of the present disclosure, but not all embodiments. The components of the embodiments of the present disclosure, which are generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present disclosure provided in the accompanying drawings is not intended to limit the scope of the disclosure, as claimed, but is merely representative of selected embodiments of the disclosure. All other embodiments, which can be made by those skilled in the art based on the embodiments of this disclosure without making any inventive effort, are intended to be within the scope of this disclosure.

Unless defined otherwise, technical or scientific terms used in this disclosure should be given the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The terms "first," "second," and the like, as used in this disclosure, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. Likewise, the terms "a," "an," or "the" and similar terms do not denote a limitation of quantity, but rather denote the presence of at least one. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate relative positional relationships, which may also be changed when the absolute position of the object to be described is changed.

Reference in the present disclosure to "a plurality of" or "a number" means two or more than two. "and/or", describes an association relationship of an association object, and indicates that there may be three relationships, for example, a and/or B, and may indicate: a exists alone, A and B exist together, and B exists alone. The character "/" generally indicates that the context-dependent object is an "or" relationship.

Before describing the display panel and the display device of the embodiments of the present disclosure, a specific structure of the display panel is first described, and the display panel mainly includes a substrate and a pixel defining layer disposed on the substrate, the pixel defining layer having pixel openings in one-to-one correspondence with sub-pixels. It is generally determined that each sub-pixel shape is the shape of a pixel opening in a pixel defining layer, and the light emitting layer is at least partially formed in the pixel opening, defining the shape of the light emitting region of that sub-pixel, i.e. the outline shape of the orthographic projection of the sub-pixel as referred to in the embodiments of the present disclosure. When the pixel opening is polygonal, the sub-pixel is polygonal.

In this disclosure, the pixel opening refers to a receiving portion of the pixel defining layer, the maximum opening width of the pixel opening in the row direction refers to the maximum width of the orthographic projection of the receiving portion of the pixel defining layer on the substrate in the row direction, and the maximum opening width of the pixel opening in the column direction refers to the maximum width of the orthographic projection of the receiving portion of the pixel defining layer on the substrate in the column direction.

In the related art, with the continuous updating of display products, the continuous expansion of application scenes is more and more, for example, the problem of screen burning of the display products (as shown in fig. 1a and 1b, by using the pixel arrangement mode, the aperture ratio of the sub-pixels is lower, the risk of screen burning for a long time is provided), the picture quality experience under different environmental scenes is worse, the standby time is shorter, and the like. For display products, the reasons for the occurrence of the phenomena are various factors, namely the pixel arrangement design needs to meet various constraint conditions, and the adoption of reasonable pixel arrangement is a way for optimizing the efficiency and the service life of the display products.

In view of this, the embodiments of the present disclosure provide a display panel including a substrate and a plurality of pixel units on the substrate; the pixel unit comprises a plurality of sub-pixels; the plurality of sub-pixels include a first sub-pixel 10, a second sub-pixel 20, a third sub-pixel 30, and a fourth sub-pixel 40, and colors of the first sub-pixel 10, the second sub-pixel 20, and the third sub-pixel 30 are different, and colors of the second sub-pixel 20 and the fourth sub-pixel 40 are the same; among the plurality of pixel units, the first sub-pixels 10 and the second sub-pixels 20 are alternately arranged in the row direction to form a plurality of rows of first pixel rows, and the first sub-pixels 10 and the fourth sub-pixels 40 are alternately arranged in the column direction to form a plurality of columns of first pixel columns; the fourth sub-pixel 40 and the third sub-pixel 30 are alternately arranged in the row direction to form a plurality of rows of second pixel rows, and the second sub-pixel 20 and the third sub-pixel 30 are alternately arranged in the column direction to form a plurality of columns of second pixel columns; the maximum opening width of the pixel opening of the first sub-pixel 10 in the row direction is the same as the maximum opening width of the pixel opening of the fourth sub-pixel 40 in the row direction; the maximum opening width of the pixel opening of the first sub-pixel 10 in the column direction is the same as the maximum opening width of the pixel opening of the second sub-pixel 20 in the column direction; the maximum opening width of the pixel opening of the fourth sub-pixel 40 in the column direction is the same as the maximum opening width of the pixel opening of the third sub-pixel 30 in the column direction; the maximum opening width of the pixel opening of the second sub-pixel 20 in the row direction is the same as the maximum opening width of the pixel opening of the third sub-pixel 30 in the row direction.

In the embodiment of the disclosure, the maximum opening width of the pixel opening of the first sub-pixel 10 along the row direction is the same as the maximum opening width of the pixel opening of the fourth sub-pixel 40 along the row direction, the maximum opening width of the pixel opening of the first sub-pixel 10 along the column direction is the same as the maximum opening width of the pixel opening of the second sub-pixel 20 along the column direction, the maximum opening width of the pixel opening of the fourth sub-pixel 40 along the column direction is the same as the maximum opening width of the pixel opening of the third sub-pixel 30 along the column direction, and the maximum opening width of the pixel opening of the second sub-pixel 20 along the row direction is the same as the maximum opening width of the pixel opening of the third sub-pixel 30 along the row direction, so that the high-precision Metal Mask (FMM) can be utilized to the greatest extent, the opening ratio of the sub-pixels is improved, and the risk of screen burn is reduced.

In the embodiment of the disclosure, the second sub-pixel 20 and the fourth sub-pixel 40 are taken as a green sub-pixel G, the first sub-pixel 10 is taken as a red sub-pixel R, and the third sub-pixel 30 is taken as a blue sub-pixel B for illustration. The shape of at least one of the red sub-pixel R, the green sub-pixel G, and the blue sub-pixel B includes a polygon, and in the embodiment of the present disclosure, the red sub-pixel R, the green sub-pixel G, and the blue sub-pixel B are all polygons. The polygon may include three or more corners according to its shape; such as a quadrilateral or the like, comprising four vertices. Of course, it should be understood that if the sub-pixels are polygonal, the number of the vertex angles thereof may be more, which is not limited in the embodiment of the present disclosure.

It should be noted that, in the embodiment of the present disclosure, the pixel unit is a light emitting device, the red subpixel R is a red light emitting device, the green subpixel G is a green light emitting device, and the blue subpixel B is a blue light emitting device.

In the following, a light emitting device is taken as an example of a single layer device structure, and fig. 2 is a schematic diagram of a display panel taking a single layer device structure as an example provided in an embodiment of the disclosure, and as shown in fig. 2, the single layer device structure refers to a structure of a light emitting device including a light emitting layer, and includes an anode 1, a hole transporting layer 3, a light emitting layer R-EML of a red subpixel R, a light emitting layer G-EML of a green subpixel G, and a light emitting layer B-EML of a blue subpixel B, an electron transporting layer 4, and a cathode 2, which are stacked in order.

In some embodiments, the outline shape of orthographic projection of the pixel opening of the sub-pixel on the substrate is set to be a regular polygon, so that the utilization rate of the high-precision mask FMM is further improved, the opening rate of the sub-pixel is improved, and the risk of screen burn is reduced.

Specifically, the outline shape of the orthographic projection of the pixel opening of the first sub-pixel 10 on the substrate is rectangular, the outline shape of the orthographic projection of the pixel opening of the second sub-pixel 20 on the substrate is rectangular, the outline shape of the orthographic projection of the pixel opening of the third sub-pixel 30 on the substrate is rectangular, and the outline shape of the orthographic projection of the pixel opening of the fourth sub-pixel 40 on the substrate is rectangular. That is, the outline shape of the orthographic projection of the pixel openings of the red, green and blue sub-pixels R, G and B on the substrate is rectangular.

Wherein, the side of the pixel opening facing away from the substrate base plate comprises a first side and a second side which are oppositely arranged along the row direction, and a third side and a fourth side which are oppositely arranged along the column direction. The length of the third side of the pixel opening of the first sub-pixel 10 is the same as the length of the third side of the pixel opening of the fourth sub-pixel 40; the length of the first side of the pixel opening of the first sub-pixel 10 is the same as the length of the first side of the pixel opening of the second sub-pixel 20; the length of the first edge of the pixel opening of the fourth sub-pixel 40 is the same as the length of the first edge of the pixel opening of the third sub-pixel 30; the length of the third side of the pixel opening of the second sub-pixel 20 is the same as the length of the third side of the pixel opening of the third sub-pixel 30.

Fig. 3a is an exemplary partial pixel arrangement schematic provided by an embodiment of the disclosure, and fig. 3b is an exemplary pixel overall arrangement schematic provided by an embodiment of the disclosure, where a row direction is denoted as an X direction and a column direction is denoted as a Y direction as shown in fig. 3a and 3 b. The length of the third side of the pixel opening of the red subpixel R is the same as the length of the third side of the pixel opening of the green subpixel G located in the same first pixel column as the red subpixel R, and the side lengths of the third side and fourth side of the green subpixel G located in the same first pixel column as the red subpixel R are referred to herein as L1. The length of the first side of the pixel opening of the red subpixel R is the same as the length of the first side of the pixel opening of the green subpixel G located in the same first pixel row as the red subpixel R, and the side lengths of the first side and the second side of the green subpixel G located in the same first pixel row as the red subpixel R are referred to herein as L2. The length of the first side of the pixel opening of the blue sub-pixel B is the same as the length of the first side of the pixel opening of the green sub-pixel G located in the same second pixel row as the blue sub-pixel B, and the side lengths of the first side and the second side of the green sub-pixel G located in the same second pixel row as the blue sub-pixel B are referred to herein as L3. The length of the third side of the pixel opening of the blue sub-pixel B is the same as the length of the third side of the pixel opening of the green sub-pixel G located in the same second pixel column as the blue sub-pixel B, and the side lengths of the third side and the fourth side of the green sub-pixel G located in the same second pixel column as the blue sub-pixel B are referred to herein as L4.

Preferably, as further shown in fig. 3a and 3b, the length of the first side and the length of the third side of the pixel opening of the red subpixel R are equal, i.e. l1=l2; the length of the first side and the length of the third side of the pixel opening of the blue sub-pixel B are equal, that is, l3=l4. At this time, the outline shape of the orthographic projection of the pixel opening of the red subpixel R on the substrate is a square with a side length of L1; the outline shape of the orthographic projection of the pixel opening of the blue sub-pixel B on the substrate is a square with a side length of L3. The outline shape of the orthographic projection of the pixel opening of the green sub-pixel G on the substrate is a rectangle with a side length of l1×l3.

Here, in this embodiment, by setting the outline shape of the orthographic projection of the pixel opening of the sub-pixel on the substrate as regular rectangle and square, a more regular pixel arrangement is obtained, so that the utilization rate of the high-precision mask FMM in the preparation process is greatly improved, and compared with the prior art (see fig. 1a and 1 b), the pixel arrangement improves the opening rate of the sub-pixel, and reduces the risk of screen burn. In addition, in the embodiment, only two parameters (L1 and L3) are required to be designed, so that the aperture opening ratio of the sub-pixels can be improved, the risk of screen burning is reduced, and compared with the complicated pixel arrangement in the prior art, the process difficulty of the product is reduced.

In some embodiments, the sum of the maximum area of the pixel opening of the first sub-pixel 10 and the maximum area of the pixel opening of the third sub-pixel 30 is greater than or equal to the sum of the maximum area of the pixel opening of the second sub-pixel 20 and the maximum area of the pixel opening of the fourth sub-pixel 40.

The maximum area of the pixel opening of the sub-pixel is understood to be the maximum area of the light emitting layer defined by the accommodating portion of the sub-pixel on the pixel defining layer, and is simply understood to be the light emitting area of the sub-pixel.

For example, the light emitting area of the sub-pixel satisfies the above condition for different pixel arrangements. Specifically, for the real pixel arrangement, each sub-pixel is not shared independently, and for one pixel unit, the sum of the light emitting area of the red sub-pixel R and the light emitting area of the blue sub-pixel B is greater than or equal to twice the light emitting area of the green sub-pixel G. For the diamond-like pixel arrangement, a pixel unit is composed of a half red sub-pixel R, a half blue sub-pixel B and a green sub-pixel G, and at this time, for the pixel unit, the sum of the light emitting area of the red sub-pixel R and the light emitting area of the blue sub-pixel B is larger than or equal to the light emitting area of the green sub-pixel G.

In the related art, the doping materials of the light emitting layers of the red and green sub-pixels R and G are generally ligands of iridium Ir, however, the material Ir is a rare material, not easily available, and thus other materials are urgently needed to replace the material Ir. In some embodiments, the first subpixel 10 is a red subpixel R; the second subpixel 20 and the fourth subpixel 40 are green subpixels G; the doping material of the light-emitting layer of the red sub-pixel R is a platinum complex or a gold complex; the doping material of the light emitting layer of the green sub-pixel G is a platinum complex or a gold complex.

Because platinum Pt and gold Au and iridium Ir belong to the third transition group metal element, and the platinum Pt and gold Au are easier to obtain than the iridium Ir, the doped materials of the light-emitting layers of the red sub-pixel R and the green sub-pixel G are set to be platinum complexes or gold complexes, and the process difficulty of product preparation is reduced.

In the related art, the lifetime and efficiency of the blue sub-pixel B are a short-panel of the current development, compared to the lifetime and efficiency of the red sub-pixel R and the green sub-pixel G. The light emitting layer of the blue subpixel B is typically made of a fluorescent material. In some embodiments, the third subpixel 30 is a blue subpixel B; the host material of the light emitting layer of the blue subpixel B is a phosphorescent material or a deuterium-band fluorescent material.

Because of the characteristic of the phosphorescent material, the host material of the light emitting layer of the blue sub-pixel B is provided as the phosphorescent material in the embodiment, and compared with the fluorescent material, the efficiency of the blue light emitting device can be improved. Experiments show that the main material of the light-emitting layer of the blue sub-pixel B is deuterium-band fluorescent material, and compared with the fluorescent material, the service life of the blue light-emitting device can be prolonged by 30%.

The above arrangement of the main material of the light emitting layer of the blue sub-pixel B can make up for the short plate of fluorescent material adopted for the light emitting layer of the blue sub-pixel B in the prior art, and can improve the efficiency and the service life of the blue light emitting device.

In some embodiments, for one pixel unit, the aperture ratio between the red, green and blue sub-pixels R, G and B is one of 1:1:2, 1:1:1.7, 1:1.2:2, 1:1.2:1.8.

Here, the aperture ratio is a ratio between an area of a light passing portion excluding a wiring portion and a transistor portion (normally hidden by a black matrix) of each pixel and an area of the entire pixel.

According to the technical iteration of the different color sub-pixels, in order to meet the efficiency and the service life of the different color sub-pixels, the white point color coordinate drift is less than or equal to 1JNCD, the opening ratio proportion of the different color sub-pixels is set, and the specific examples are described below. Here, JNCD is a standard for measuring the color accuracy of a screen, and specifically refers to the minimum unit of color change that human eyes can distinguish, and the smaller the value, the better the effect of recovering the natural color of the screen.

With the display product replacement cycle extended, in order to avoid burn-in, the following examples are based on the white light lifetime rule spec and the luminous intensity 600nit, and under the condition that the luminance lifetime is equal to the color lifetime and the luminance lifetime is greater than 1000hr, the lifetime requirements of the red sub-pixel R, the green sub-pixel G and the blue sub-pixel B are simulated, specifically as follows:

fig. 4a is a schematic diagram of a lifetime curve of an example one provided by an embodiment of the disclosure, where, as shown in fig. 4a, an abscissa indicates time, a left ordinate indicates luminance lifetime, a right ordinate indicates color lifetime, an aperture ratio between a red sub-pixel R, a green sub-pixel G and a blue sub-pixel B is 1:1:2 for a pixel unit, a doping material of a light emitting layer of the red sub-pixel R is a ligand of Ir, a doping material of a light emitting layer of the green sub-pixel G is a ligand of Ir, and a host material of a light emitting layer of the blue sub-pixel B is a fluorescent material. The lifetime of the red sub-pixel R is relatively improved by 100%, the lifetime of the green sub-pixel G is relatively improved by 100%, and the lifetime of the blue sub-pixel B is relatively improved by 100%.

T95 represents the time taken for the luminance to decay to 95% of the initial value.

The materials of the light emitting layers of the sub-pixels with different colors in the example adopt the materials of the light emitting layers in the prior art, and the aperture ratio among the sub-pixels with different colors is purposefully designed on the basis, for example, the original aperture ratio is adjusted to 1:1:1.7 from 1:1:2, so that the aperture ratio of the blue sub-pixel B is relatively improved, and as can be known from the data feedback in the table, the service life of the final display panel can be prolonged, and the burn-in is avoided.

Fig. 4B is a schematic diagram of a lifetime curve of an example two provided by an embodiment of the disclosure, as shown in fig. 4B, for one pixel unit, an aperture ratio between the red sub-pixel R, the green sub-pixel G, and the blue sub-pixel B is 1:1:1.7, a doping material of a light emitting layer of the red sub-pixel R is a ligand of Ir, a doping material of a light emitting layer of the green sub-pixel G is a ligand of Ir, and a host material of a light emitting layer of the blue sub-pixel B is a deuterium-band fluorescent material. Based on this, the lifetime of the red sub-pixel R is relatively improved by 100%, the lifetime of the green sub-pixel G is relatively improved by 100%, and the lifetime of the blue sub-pixel B is relatively improved by 130%.

In this example, the materials of the light emitting layers of the red sub-pixel R and the green sub-pixel G are light emitting layer materials in the prior art, the main material of the light emitting layer of the blue sub-pixel B is a deuterium fluorescent material, and the ratio of the aperture ratios between the sub-pixels with different colors is designed in a targeted manner, as can be seen from the data feedback in table one, the service life of the final display panel can be improved, and the burn-in is avoided.

Fig. 4c is a schematic diagram of a lifetime curve of an example three provided by an embodiment of the disclosure, where, as shown in fig. 4c, for one pixel unit, an aperture ratio between the red sub-pixel R, the green sub-pixel G, and the blue sub-pixel B is 1:1:2, a doping material of the light emitting layer of the red sub-pixel R is a ligand of Ir, a doping material of the light emitting layer of the green sub-pixel G is a ligand of Ir, and a host material of the light emitting layer of the blue sub-pixel B is a phosphorescent material. Based on this, the lifetime of the red sub-pixel R is relatively improved by 100%, the lifetime of the green sub-pixel G is relatively improved by 100%, and the lifetime of the blue sub-pixel B is relatively improved by 200%.

In this example, the materials of the light emitting layers of the red sub-pixel R and the green sub-pixel G are light emitting layer materials in the prior art, the main material of the light emitting layer of the blue sub-pixel B is a phosphorescent material, and the aperture ratio between the sub-pixels with different colors is designed in a targeted manner, for example, the aperture ratio is adjusted from 1:1:1.7 to 1:1:2, so that the aperture ratio of the blue sub-pixel B is relatively improved, and as can be known from the data feedback in the table one, the service life of the final display panel can be improved, and the burn-in is avoided.

In an example four, fig. 4d is a schematic diagram of a lifetime curve of an example four provided by an embodiment of the present disclosure, as shown in fig. 4d, for one pixel unit, an aperture ratio between the red sub-pixel R, the green sub-pixel G, and the blue sub-pixel B is 1:1:1.7, a doping material of the light emitting layer of the red sub-pixel R is a ligand of Pt, a doping material of the light emitting layer of the green sub-pixel G is a ligand of Ir, and a host material of the light emitting layer of the blue sub-pixel B is a fluorescent material. Based on this, the lifetime of the red sub-pixel R is relatively increased by 60%, the lifetime of the green sub-pixel G is relatively increased by 100%, and the lifetime of the blue sub-pixel B is relatively increased by 100%.

The materials of the light emitting layers of the blue sub-pixel B and the green sub-pixel G in the example adopt the materials of the light emitting layers in the prior art, the doping materials of the light emitting layers of the red sub-pixel R adopts Pt ligands in a targeted manner, the ratio of the opening ratios among the sub-pixels with different colors is designed in a targeted manner, and the data feedback in the table one shows that the service life requirement of the display panel can be met, and the probability of burning the product is reduced.

Fig. 4e is a schematic diagram of a lifetime curve of an example five provided by an embodiment of the disclosure, where, as shown in fig. 4e, for one pixel unit, an aperture ratio between the red sub-pixel R, the green sub-pixel G, and the blue sub-pixel B is 1:1.2:2, a doping material of the light emitting layer of the red sub-pixel R is a ligand of Pt, a doping material of the light emitting layer of the green sub-pixel G is a ligand of Ir, and a host material of the light emitting layer of the blue sub-pixel B is a deuterium-band fluorescent material. Based on this, the lifetime of the red sub-pixel R is relatively increased by 60%, the lifetime of the green sub-pixel G is relatively increased by 100%, and the lifetime of the blue sub-pixel B is relatively increased by 130%. Luminance lifetime T95 is 1200hr and lifetime color shift @ JNCD is 1700hr.

In this example, the material of the light emitting layer of the green sub-pixel G adopts the light emitting layer material in the prior art, the doped material of the light emitting layer of the red sub-pixel R adopts a ligand of Pt in a targeted manner, the main material of the light emitting layer of the blue sub-pixel B adopts a deuterium-containing fluorescent material, and the aperture ratio between the sub-pixels of different colors is designed in a targeted manner, for example, the aperture ratio is adjusted to 1:1.2:2 from the original aperture ratio of 1:1:1.7, so that the aperture ratio of the green sub-pixel G and the aperture ratio of the blue sub-pixel B are relatively improved, and as can be known from the data feedback in table one, the service life of the final display panel can be improved, and the burn-in is avoided.

Fig. 4f is a schematic diagram of a lifetime curve of an example six provided by an embodiment of the disclosure, where, as shown in fig. 4f, for one pixel unit, an aperture ratio between the red sub-pixel R, the green sub-pixel G, and the blue sub-pixel B is 1:1.2:2, a doping material of the light emitting layer of the red sub-pixel R is a ligand of Pt, a doping material of the light emitting layer of the green sub-pixel G is a ligand of Ir, and a host material of the light emitting layer of the blue sub-pixel B is a phosphorescent material. Based on this, the lifetime of the red sub-pixel R is relatively increased by 60%, the lifetime of the green sub-pixel G is relatively increased by 100%, and the lifetime of the blue sub-pixel B is relatively increased by 200%. Luminance lifetime T95 is 1400hr and lifetime color shift @ JNCD is 1800hr.

In this example, the material of the light emitting layer of the green sub-pixel G adopts the light emitting layer material in the prior art, the doped material of the light emitting layer of the red sub-pixel R adopts the ligand of Pt in a targeted manner, the main material of the light emitting layer of the blue sub-pixel B adopts the phosphorescent material, and the aperture ratio between the sub-pixels of different colors is designed in a targeted manner, for example, the aperture ratio is adjusted from the original aperture ratio of 1:1:1.7 to 1:1.2:2, so that the aperture ratio of the green sub-pixel G and the aperture ratio of the blue sub-pixel B are relatively improved, as can be known from the data feedback in the table one, the service life of the final display panel can be improved, and the burn-in is avoided.

An example seven, fig. 4G is a schematic diagram of a lifetime curve of an example seven provided by an embodiment of the disclosure, as shown in fig. 4G, for one pixel unit, an aperture ratio between the red sub-pixel R, the green sub-pixel G, and the blue sub-pixel B is 1:1.2:1.8, a doping material of the light emitting layer of the red sub-pixel R is a ligand of Ir, a doping material of the light emitting layer of the green sub-pixel G is a ligand of Pt, and a host material of the light emitting layer of the blue sub-pixel B is a fluorescent material. The lifetime of the red sub-pixel R is relatively improved by 100%, the lifetime of the green sub-pixel G is relatively improved by 80%, and the lifetime of the blue sub-pixel B is relatively improved by 100%.

The materials of the light emitting layers of the red sub-pixel R and the blue sub-pixel B in the example adopt the materials of the light emitting layers in the prior art, the doping materials of the light emitting layers of the green sub-pixel G adopt Pt ligands in a targeted manner, and the ratio of the aperture ratios among the sub-pixels with different colors is designed in a targeted manner on the basis, for example, the ratio of the original aperture ratio is 1:1:1.7 and is adjusted to be 1:1.2:1.8, the aperture ratio of the green sub-pixel G and the aperture ratio of the blue sub-pixel B are relatively improved, and the service life of a final display panel can be prolonged and screen burning is avoided as shown by data feedback in the table one.

Fig. 4h is a schematic diagram of a lifetime curve of an example eight provided by an embodiment of the disclosure, where, as shown in fig. 4h, for one pixel unit, an aperture ratio between a red sub-pixel R, a green sub-pixel G, and a blue sub-pixel B is 1:1.2:2, a doping material of a light emitting layer of the red sub-pixel R is a ligand of Ir, a doping material of a light emitting layer of the green sub-pixel G is a ligand of Pt, and a host material of a light emitting layer of the blue sub-pixel B is a deuterium-band fluorescent material. Based on this, the lifetime of the red sub-pixel R is relatively improved by 100%, the lifetime of the green sub-pixel G is relatively improved by 80%, and the lifetime of the blue sub-pixel B is relatively improved by 130%.

In this example, the material of the light emitting layer of the red sub-pixel R adopts the light emitting layer material in the prior art, the doped material of the light emitting layer of the green sub-pixel G adopts a ligand of Pt in a targeted manner, the main material of the light emitting layer of the blue sub-pixel B adopts a deuterium-containing fluorescent material, and the aperture ratio between the sub-pixels of different colors is designed in a targeted manner, for example, the aperture ratio is adjusted to 1:1.2:2 from the original aperture ratio of 1:1:1.7, so that the aperture ratio of the green sub-pixel G and the aperture ratio of the blue sub-pixel B are relatively improved, and as can be known from the data feedback in table one, the service life of the final display panel can be improved, and the burn-in is avoided.

Fig. 4i is a schematic diagram of a lifetime curve of an example nine provided by an embodiment of the disclosure, where, as shown in fig. 4i, for one pixel unit, an aperture ratio between a red sub-pixel R, a green sub-pixel G, and a blue sub-pixel B is 1:1.2:1.8, a doping material of a light emitting layer of the red sub-pixel R is a ligand of Ir, a doping material of a light emitting layer of the green sub-pixel G is a ligand of Pt, and a host material of a light emitting layer of the blue sub-pixel B is a phosphorescent material. Based on this, the lifetime of the red sub-pixel R is relatively improved by 100%, the lifetime of the green sub-pixel G is relatively improved by 80%, and the lifetime of the blue sub-pixel B is relatively improved by 200%.

In this example, the material of the light emitting layer of the red sub-pixel R adopts the light emitting layer material in the prior art, the doped material of the light emitting layer of the green sub-pixel G adopts the ligand of Pt in a targeted manner, the main material of the light emitting layer of the blue sub-pixel B adopts the phosphorescent material, and the aperture ratio between the sub-pixels of different colors is designed in a targeted manner, for example, the aperture ratio is adjusted from the original aperture ratio of 1:1:1.7 to 1:1.2:1.8, so that the aperture ratio of the green sub-pixel G and the aperture ratio of the blue sub-pixel B are relatively improved, and as can be known from the data feedback in table one, the service life of the final display panel can be improved, and the burn-in is avoided.

List one

In some embodiments, fig. 5 is a schematic diagram of an exemplary low-gray-scale tailing phenomenon provided by the embodiments of the present disclosure, and fig. 6 is a schematic diagram of a change of threshold voltage when switching a high gray scale with a low gray scale provided by the embodiments of the present disclosure. When the display screen in the display panel is switched from a black screen to a white screen, the current difference (i.e. the voltage hysteresis shown in fig. 6) caused by the TFT hysteresis of the thin film transistor can cause the abnormal colors of white, red, green, blue and the like shown in fig. 5, i.e. the low gray-scale tailing phenomenon; in addition, due to the difference in capacitance of the OLED device itself (capacitance of the green light emitting device > capacitance of the red light emitting device > capacitance of the blue light emitting device), color shift of the white screen may also occur. Specifically, the larger the capacitance is, the slower the OLED device is turned on, and the lower gray-scale tailing phenomenon is more obvious; or, the influence of the driving condition of the OLED device, such as the data voltage date, the reset voltage reset, and the threshold voltage Vth also influence the turn-on current Ids, when the black frame is switched to the white frame, the turn-on current becomes larger, and the larger the turn-on current, the slower the turn-on of the OLED device, and the lower gray-scale tailing phenomenon is more obvious.

In order to improve the low-grayscale tailing phenomenon, the aperture ratio among the red sub-pixel R, the green sub-pixel G and the blue sub-pixel B is purposefully adjusted, specifically, the ratio of the aperture ratio of the blue sub-pixel B to the aperture ratio of the red sub-pixel R is greater than 2.8, and the ratio of the aperture ratio of the blue sub-pixel B to the aperture ratio of the green sub-pixel G is greater than 2.8.

For example, the aperture ratio of the red subpixel R and the aperture ratio of the green subpixel G may be appropriately reduced. Alternatively, the aperture ratio of the blue subpixel B may be appropriately increased. Alternatively, the aperture ratio of the red subpixel R and the aperture ratio of the green subpixel G may be appropriately reduced, and the aperture ratio of the blue subpixel B may be appropriately increased.

The aperture ratio of the red sub-pixel R and the aperture ratio of the green sub-pixel G are reduced, and the capacitance of the red light emitting device and the capacitance of the green light emitting device are relatively reduced; the aperture ratio of the blue sub-pixel B is improved, and the capacitance of the blue light emitting device is relatively reduced, so that the capacitance difference between the light emitting devices with different colors is shortened, the color shift generated when the black picture is switched to the white picture is reduced, and the low-gray-scale tailing is improved. In addition, the aperture ratio is reduced, and the starting current of the light-emitting device can be reduced, so that the phenomenon of low gray-scale tailing is weakened.

In some embodiments, the ratio of the aperture ratio of the red subpixel R and the ratio of the aperture ratio of the blue subpixel B are the same. For example, in the case that the sub-pixel includes a light emitting layer, setting the aperture ratio between the red sub-pixel R, the green sub-pixel G, and the blue sub-pixel B to be 1:1:2.8 can reduce color shift occurring when switching from a black screen to a white screen, and improve low gray-scale tailing.

In some embodiments, the display panel of the present disclosure may employ a tan device structure in addition to a single device structure. Fig. 7 is a schematic diagram of a display panel taking a tandem device structure as an example, as shown in fig. 7, the tandem device structure refers to a structure of a light emitting device including multiple light emitting layers, and includes an anode 1, a first hole transporting layer 31, a light emitting layer R-EML1 of a red sub-pixel R, a light emitting layer G-EML1 of a green sub-pixel G, and a light emitting layer B-EML1 of a blue sub-pixel B, a first electron transporting layer 41, a light emitting layer R-EML2 of a red sub-pixel R, a light emitting layer G-EML2 of a green sub-pixel G, and a light emitting layer B-EML2 of a blue sub-pixel B, which are stacked in order, a second electron transporting layer 42, and a cathode 2. Compared with the case that the sub-pixel only comprises a single-layer luminescent layer, the capacitance of the OLED device corresponding to the sub-pixel is increased, and on the basis of the single-layer luminescent layer, the embodiment can further reduce the aperture ratio of the red sub-pixel R and the aperture ratio of the green sub-pixel G, for example, the aperture ratio between the red sub-pixel R, the green sub-pixel G and the blue sub-pixel B can be set to be 0.5:0.5:2.8, so that the color cast of the display panel of the serial OLED device when the display panel is switched from a black picture to a white picture is reduced, and the low-gray-scale tailing is improved.

In some embodiments, for one pixel unit, the ratio of the aperture ratios between the red, green and blue sub-pixels R, G and B is 1:1.4:2.

The light emitting devices of different colors correspond to the sub-pixels of different colors. Fig. 8 is a schematic diagram of the relationship between brightness and voltage provided by the embodiment of the disclosure, and as shown in fig. 8, the relationship between voltage and brightness corresponding to light emitting devices with different colors is included, and it can be clearly seen that, at low gray scale, a green light emitting device is more sensitive to voltage fluctuation than a red light emitting device and a blue light emitting device. The aperture ratio of the green sub-pixel G can be correspondingly reduced, thereby ensuring the image quality of low gray scale. Specifically, the ratio of the aperture ratios among the red sub-pixel R, the green sub-pixel G and the blue sub-pixel B is 1:1.4:2, so that the image quality of low gray scale can be ensured.

Illustratively, in combination with thin film transistor TFT leakage, it is desirable to ensure that the OLED on current is greater than 0.1pA. Fig. 9a is a schematic diagram between an on current and a voltage of a red light emitting device provided by an embodiment of the disclosure, fig. 9b is a schematic diagram between an on current and a voltage of a green light emitting device provided by an embodiment of the disclosure, and fig. 9c is a schematic diagram between an on current and a voltage of a blue light emitting device provided by an embodiment of the disclosure, wherein an abscissa indicates a voltage and an ordinate indicates an on current of the light emitting device. The light emitting devices of different colors correspond to the sub-pixels of different colors. As shown in fig. 9a,9b and 9c, when the on current of the red light emitting device is 0.1pA, the corresponding voltage is 2.6V; when the on current of the green light emitting device is 0.1pA, the corresponding voltage is 3.4V; when the turn-on current of the blue light emitting device was 0.1pA, the corresponding voltage was 2.6V. Fig. 10a is a schematic diagram between voltage and luminance of a red light emitting device provided by an embodiment of the present disclosure, fig. 10b is a schematic diagram between voltage and luminance of a green light emitting device provided by an embodiment of the present disclosure, fig. 10c is a schematic diagram between voltage and luminance of a blue light emitting device provided by an embodiment of the present disclosure, wherein an abscissa indicates voltage, an ordinate indicates luminance of a light emitting device, von1 indicates 1nit voltage, von2 indicates 10000nit voltage, vdela indicates a voltage difference of 1-10000nit, that is, a voltage range that can be adjusted, as shown in fig. 10a,10b and 10c, according to a relationship between luminance and voltage of light emitting devices of different colors at low voltage, luminance of a red light emitting device, a green light emitting device and a blue light emitting device at respective corresponding voltages can be obtained. Here, the aperture ratio between the red, green, and blue sub-pixels R, G, and B may be set to be the ratio of the luminances of the red, green, and blue sub-pixels R, G, and B at 1:1.5:2.5 voltages.

In some embodiments, fig. 11 is a schematic view of a light extraction structure provided in an embodiment of the disclosure, where, as shown in fig. 11, the display panel further includes a passivation layer PVX and a light extraction structure sequentially disposed on a side of the pixel unit facing away from the substrate; the light extraction structure comprises a first low refractive index layer 01, a high refractive index layer 02 and a second low refractive index layer 03 which are sequentially arranged in the direction of the substrate pointing to the pixel unit; the refractive index of both the first low refractive index layer 01 and the second low refractive index layer 03 is smaller than that of the high refractive index layer 02. Among them, the material of the high refractive index layer 02 may be a Microlens (Microlens) material, and the material of the first low refractive index layer 01 and the second low refractive index layer 03 may be a resin (resin) material. The light extraction efficiency is improved by utilizing the multi-layer light extraction structure with the high and low refractive index change. The efficiency gain of the light emitting device is related to the resolution of the display panel, since the arrangement of the light extraction structure affects the efficiency gain of the light emitting device. On the basis of the aperture ratio of 1:1.4:2, namely on the premise of improving low-gray trailing and guaranteeing low-gray image quality, the aperture ratio of the green sub-pixel G and the aperture ratio of the blue sub-pixel B are reduced, and for one pixel unit, the aperture ratio among the red sub-pixel R, the green sub-pixel G and the blue sub-pixel B is set to be 1:1:1.2, so that the efficiency gain of the light-emitting device is improved.

In some embodiments, fig. 12 is a schematic diagram of a TFT characteristic-OLED luminance-temperature change curve in the embodiment of the present disclosure, as shown in fig. 12, the green sub-pixel G in the red sub-pixel R, the green sub-pixel G, and the blue sub-pixel B is sensitive to the change of the threshold voltage Vth, and on the basis of the aperture ratio of 1:1:1.2, that is, on the premise of improving the tailing of low gray scale, ensuring the low gray scale image quality, and the efficiency gain of the light emitting device, the aperture ratio of the green sub-pixel G is reduced, the sensitivity of the green sub-pixel G to the threshold voltage Vth is weakened, and for one pixel unit, the aperture ratio among the red sub-pixel R, the green sub-pixel G, and the blue sub-pixel B is set to be 1:0.8:2.2, so that the color cast occurring when switching from a black image to a white image can be reduced.

The above is a complete description of the display panel.

The embodiment of the present disclosure also provides a display device including the display panel according to any one of the above embodiments. The display device may be: any product or component with display function such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like. Other essential components of the display panel are those of ordinary skill in the art and will not be described in detail herein, nor should they be considered as limiting the present disclosure.

The embodiment of the disclosure further provides a high-precision metal mask for manufacturing the display panel according to any one of the above embodiments, and in particular, the high-precision metal mask FMM is configured to form pixel openings corresponding to each sub-pixel in the pixel defining layer.

It is to be understood that the above embodiments are merely exemplary embodiments employed to illustrate the principles of the present disclosure, however, the present disclosure is not limited thereto. Various modifications and improvements may be made by those skilled in the art without departing from the spirit and substance of the disclosure, and are also considered to be within the scope of the disclosure.

Claims (14)

1. A display panel comprising a substrate base plate and a plurality of pixel units positioned on the substrate base plate; the pixel unit comprises a plurality of sub-pixels; the plurality of sub-pixels comprise a first sub-pixel, a second sub-pixel, a third sub-pixel and a fourth sub-pixel, the colors of the first sub-pixel, the second sub-pixel and the third sub-pixel are different, and the colors of the second sub-pixel and the fourth sub-pixel are the same;

the first sub-pixels and the second sub-pixels are alternately arranged along the row direction to form a plurality of rows of first pixel rows, and the first sub-pixels and the fourth sub-pixels are alternately arranged along the column direction to form a plurality of columns of first pixel columns; the fourth sub-pixel and the third sub-pixel are alternately arranged along the row direction to form a plurality of rows of second pixel rows, and the second sub-pixel and the third sub-pixel are alternately arranged along the column direction to form a plurality of columns of second pixel columns;

The maximum opening width of the pixel opening of the first sub-pixel along the row direction is the same as the maximum opening width of the pixel opening of the fourth sub-pixel along the row direction; the maximum opening width of the pixel opening of the first sub-pixel along the column direction is the same as the maximum opening width of the pixel opening of the second sub-pixel along the column direction; the maximum opening width of the pixel opening of the fourth sub-pixel along the column direction is the same as the maximum opening width of the pixel opening of the third sub-pixel along the column direction; the maximum opening width of the pixel opening of the second sub-pixel along the row direction is the same as the maximum opening width of the pixel opening of the third sub-pixel along the row direction.

2. The display panel of claim 1, wherein the outline shape of the orthographic projection of the pixel opening of the first sub-pixel on the substrate is rectangular, the outline shape of the orthographic projection of the pixel opening of the second sub-pixel on the substrate is rectangular, the outline shape of the orthographic projection of the pixel opening of the third sub-pixel on the substrate is rectangular, and the outline shape of the orthographic projection of the pixel opening of the fourth sub-pixel on the substrate is rectangular;

One side of the pixel opening, which is away from the substrate base plate, comprises a first side and a second side which are oppositely arranged along the row direction, and a third side and a fourth side which are oppositely arranged along the column direction;

the length of the third side of the pixel opening of the first sub-pixel is the same as the length of the third side of the pixel opening of the fourth sub-pixel; the length of the first edge of the pixel opening of the first sub-pixel is the same as the length of the first edge of the pixel opening of the second sub-pixel; the length of the first edge of the pixel opening of the fourth sub-pixel is the same as the length of the first edge of the pixel opening of the third sub-pixel; the length of the third side of the pixel opening of the second sub-pixel is the same as the length of the third side of the pixel opening of the third sub-pixel.

3. The display panel of claim 1, wherein a sum of a maximum area of the pixel opening of the first sub-pixel and a maximum area of the pixel opening of the third sub-pixel is greater than or equal to a sum of a maximum area of the pixel opening of the second sub-pixel and a maximum area of the pixel opening of the fourth sub-pixel.

4. The display panel of claim 1, wherein the first subpixel is a red subpixel; the second sub-pixel and the fourth sub-pixel are green sub-pixels; the doping material of the light-emitting layer of the red sub-pixel is a platinum complex or a gold complex; the doping material of the light-emitting layer of the green sub-pixel is a platinum complex or a gold complex.

5. The display panel of claim 4, wherein the third subpixel is a blue subpixel; the main material of the light-emitting layer of the blue sub-pixel is a phosphorescent material or a deuterium-band fluorescent material.

6. The display panel of claim 5, wherein for one of the pixel units, an aperture ratio between the red, green, and blue sub-pixels is one of 1:1:2, 1:1:1.7, 1:1.2:2, 1:1.2:1.8.

7. The display panel of any one of claims 1-6, wherein the first subpixel is a red subpixel, the second subpixel and the fourth subpixel are green subpixels, and the third subpixel is a blue subpixel;

the ratio of the aperture ratio of the blue sub-pixel to the aperture ratio of the red sub-pixel is greater than 2.8, and the ratio of the aperture ratio of the blue sub-pixel to the aperture ratio of the green sub-pixel is greater than 2.8.

8. The display panel of any one of claims 1-6, wherein the first subpixel is a red subpixel, the second subpixel and the fourth subpixel are green subpixels, and the third subpixel is a blue subpixel; the first subpixel, the second subpixel, the third subpixel, and the fourth subpixel each include a plurality of light emitting layers;

The ratio of the aperture ratio of the blue sub-pixel to the aperture ratio of the red sub-pixel is greater than 3.5, and the ratio of the aperture ratio of the blue sub-pixel to the aperture ratio of the green sub-pixel is greater than 3.5.

9. The display panel of claim 7, wherein the ratio of the aperture ratio of the red sub-pixel and the ratio of the aperture ratio of the blue sub-pixel are the same.

10. The display panel of claim 9, wherein an aperture ratio between the red, green and blue sub-pixels is 1:1.4:2 for one of the pixel units.

11. The display panel of claim 10, wherein an aperture ratio between the red, green and blue sub-pixels is 1:1:1.2 for one of the pixel units.

12. The display panel of claim 11, wherein an aperture ratio between the red, green and blue sub-pixels is 1:0.8:2.2 for one of the pixel units.

13. The display panel of claim 1, wherein the display panel further comprises a light extraction structure disposed on a side of the pixel cell facing away from the substrate; the light extraction structure comprises a first low refractive index layer, a high refractive index layer and a second low refractive index layer which are sequentially arranged along the direction of the substrate to the pixel unit, wherein the refractive indexes of the first low refractive index layer and the second low refractive index layer are smaller than those of the high refractive index layer.

14. A display device comprising the display panel according to any one of claims 1 to 13.

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