CN117479718A

CN117479718A - Display panel and display device

Info

Publication number: CN117479718A
Application number: CN202311345059.XA
Authority: CN
Inventors: 汪国杰
Original assignee: Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd
Current assignee: Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd
Priority date: 2023-10-17
Filing date: 2023-10-17
Publication date: 2024-01-30

Abstract

The embodiment of the application discloses a display panel and a display device, wherein the display panel comprises at least one display group, the display group comprises a plurality of pixel units which are distributed in an array along a first direction and a second direction, each pixel unit comprises a plurality of sub-pixels which are distributed along the second direction and have different colors, and long axes of the sub-pixels extend along the first direction; wherein, in a plurality of sub-pixels of the same color arranged along the second direction, the lengths of the long axes of at least two sub-pixels are different. According to the method and the device, the long axis length of the sub-pixels with the same color in the same printing direction is designed differently, so that linear mura can be eliminated.

Description

Display panel and display device

Technical Field

The application relates to the field of display, in particular to a display panel and a display device.

Background

An Organic Light-Emitting Diode (OLED) device has the characteristics of self-luminescence, wide viewing angle, high contrast, fast response speed, light and thin, and the like, and has become a major trend of display technology.

Compared with the OLED device manufactured by adopting Fine Metal Mask and vacuum evaporation, the Ink jet printing technology (Ink jet printer) has no need of Fine Metal Mask because of accurate alignment, and the material utilization rate can reach 95%, so that the Ink jet printing technology is a main trend of manufacturing large-size OLED devices in the future.

The organic light emitting diode pixel arrangement structure is generally composed of a plurality of pixel points, each pixel point comprises a red sub-pixel, a green sub-pixel and a blue sub-pixel, and the red sub-pixel, the green sub-pixel and the blue sub-pixel are sequentially and circularly arranged to form a matrix. Ink is printed into corresponding pixels through nozzles (nozzles), but the volume of ink drops ejected from each nozzle is different due to different physical hardware differences among the nozzles, so that in the scan direction of printing, the volume differences exist among adjacent pixel columns to form a linear Mura (uneven display), the product yield is affected, and the current product cannot be produced in a large quantity.

Disclosure of Invention

The embodiment of the application provides a display panel, which comprises at least one display group, wherein the display group comprises:

the pixel units are distributed in an array along a first direction and a second direction, each pixel unit comprises a plurality of sub-pixels which are distributed along the second direction and have different colors, and the long axes of the sub-pixels extend along the first direction;

and the long axis lengths of at least two sub-pixels in the plurality of sub-pixels with the same color arranged along the second direction are different.

In some embodiments of the present application, the absolute value of the difference between the long axis lengths of the at least two of the sub-pixels is greater than 0 and less than 10 microns.

In some embodiments of the present application, lengths of long axes of the plurality of sub-pixels of the same color arranged along the second direction are irregularly changed.

In some embodiments of the present application, the display panel includes a plurality of display groups, where the number of pixel units of each display group is the same and the array distribution rule is the same, and the lengths of long axes of the corresponding sub-pixels of different display groups are the same.

In some embodiments of the present application, the display panel includes a plurality of display groups, at least two of the display groups have the same number of pixel units and the same array distribution rule, and the long axis lengths of the corresponding sub-pixels of the at least two display groups are different.

In some embodiments of the present application, the display panel further includes:

a substrate;

the pixel limiting layer is arranged on the substrate and comprises a plurality of openings which are distributed in an array along a first direction and a second direction, and the openings are in one-to-one correspondence with the sub-pixels; wherein,

and among the openings corresponding to the plurality of sub-pixels which are arranged along the second direction and have the same color, the lengths of at least two openings along the first direction are different.

In some embodiments of the present application, each of the subpixels includes an anode disposed on the substrate, a luminescent material layer disposed on the anode, and a cathode disposed on the luminescent material layer, the luminescent material layer being positioned within the corresponding opening, wherein,

the film thickness of the light emitting material layer of the plurality of sub-pixels of the same color arranged along the second direction is inversely proportional to the length of the corresponding opening along the first direction.

In some embodiments of the present application, the volumes of the luminescent material layers of the same column of the same color sub-pixels arranged along the second direction are the same.

In some embodiments of the present application, the volumes of the luminescent material layers of the same color sub-pixels of different columns arranged along the second direction are different.

In some embodiments of the present application, the second direction is taken as a column direction, and in the plurality of sub-pixels with the same color in each column, the length of the long axis of the first sub-pixel appearing in sequence is greater than the length of the long axes of the other sub-pixels with the same color in the column.

The application also provides a display device comprising the display panel in any embodiment.

The display panel and the display device provided by the embodiment of the application comprise at least one display group, wherein the display group comprises a plurality of pixel units distributed in an array along a first direction and a second direction, each pixel unit comprises a plurality of sub-pixels which are distributed along the second direction and have different colors, and the long axes of the sub-pixels extend along the first direction; wherein, in a plurality of sub-pixels of the same color arranged along the second direction, the lengths of the long axes of at least two sub-pixels are different. According to the method and the device, the long axis length of the sub-pixels with the same color in the same printing direction is designed differently, so that linear mura can be eliminated.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic diagram of a film stack structure of a display panel according to an embodiment of the present disclosure;

fig. 2 is a schematic diagram of a first arrangement of pixel units according to an embodiment of the present application;

fig. 3 is a schematic plan view of a display panel according to an embodiment of the present disclosure;

fig. 4 is a schematic diagram of a second arrangement of pixel units according to an embodiment of the present disclosure;

fig. 5 is a schematic film diagram of a pixel defining layer according to an embodiment of the present disclosure;

FIG. 6 is a test chart of a display screen of a conventional display panel in a dark state;

fig. 7 is a test chart of a display screen of the display panel in a dark state according to the embodiment of the present application.

Detailed Description

In the following detailed description, certain embodiments of the invention are shown and described, simply by way of illustration. As will be appreciated by those skilled in the art, the embodiments described herein may be modified in numerous ways without departing from the spirit or scope of the present invention.

In the drawings, the thickness of layers, films, plates, regions, etc. may be exaggerated for clarity and for better understanding and ease of description. It will be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" another element, it can be directly on the other element or intervening elements may also be present.

In addition, unless explicitly described to the contrary, the word "comprise" and variations such as "comprises" or "comprising" will be understood to imply the inclusion of stated elements but not the exclusion of other elements. Further, in the specification, the word "on … …" means placed above or below the object portion, and not necessarily placed on the upper side of the object portion based on the direction of gravity.

It will be understood that, although the terms "first," "second," etc. may be used herein to describe various components, these components should not be limited by these terms. These components are only used to distinguish one component from another. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used herein, specify the presence of stated features or components, but do not preclude the presence or addition of one or more other features or components. It will be understood that when a layer, region, or element is referred to as being "formed on" or "disposed on" another layer, region, or element, it can be directly or indirectly formed or disposed on the other layer, region, or element. For example, intervening layers, regions, or components may be present.

As shown in fig. 1 to 3, the embodiment of the present application provides a display panel 1000, where the display panel 1000 includes a plurality of display groups 101 distributed in an array, each display group 101 includes a plurality of pixel units 10, where the pixel units 10 are distributed in an array along a first direction X and a second direction Y, each pixel unit 10 includes a plurality of sub-pixels 11 arranged along the second direction Y and having different colors, and a long axis of each sub-pixel 11 extends along the first direction X; among the plurality of sub-pixels 11 of the same color arranged along the second direction Y, the long axis lengths of at least two sub-pixels are different, and linear mura (display unevenness) can be eliminated by differently designing the long axis sizes of the sub-pixels 11 of the same color in the same column.

In some embodiments, among the plurality of sub-pixels of the same color arranged along the second direction Y, the absolute value of the difference between the lengths W1 of the long axes of the sub-pixels 11 of the same color is greater than 0 and less than 10 micrometers, so that on one hand, one linear mura of the ink-jet printing along the printing direction can be eliminated, and on the other hand, the display brightness is not affected.

In some embodiments, the difference between the long axis lengths of the sub-pixels 11 in different positions may be different in the same column of the sub-pixels 11 of the same color, for example, the absolute value of the difference between the long axis lengths of the adjacent two sub-pixels 11 in some positions may be greater than 7 micrometers and less than 10 micrometers, the absolute value of the difference between the long axis lengths of the adjacent two sub-pixels 11 in some positions may be greater than 0 micrometers and less than or equal to 3 micrometers, and the absolute value of the difference between the long axis lengths of the adjacent two sub-pixels 11 in other positions may be greater than 3 micrometers and less than or equal to 7 micrometers.

The technical scheme of the present application is described in detail below through specific examples.

The display panel 1000 of the embodiments of the present application may be a flexible display panel, or may be a rigid display panel, and in particular may be an OLED display panel. As shown in fig. 1, the display panel 1000 may include the following structure:

the substrate 100 may be made of an organic material having insulating properties and being flexible so as to be capable of heat treatment at a temperature equal to or greater than about 450 ℃, and the substrate 100 may be formed as a single layer formed of polyimide or may be formed as a plurality of layers formed by repeatedly stacking polyimide through coating and curing, for example. The substrate 100 may be a flexible substrate formed by coating a polymeric material such as polyimide on a supporting substrate (not shown) and curing the polymeric material. In this case, the substrate may be formed into a plurality of layers by repeatedly coating and curing the polymeric material. The support substrate may be formed of glass, metal, or ceramic, and the polyimide may be coated on the support substrate by a coating process such as spin coating, slot coating, inkjet coating, or the like. The support substrate may be removed in a subsequent process.

The barrier layer 110 is disposed on the substrate 100, and the barrier layer 110 may include various insulating materials (e.g., silicon oxide or silicon nitride) and may have a single-layer or multi-layer structure, without limitation. The barrier layer 110 may provide a planarization layer on an upper surface of the substrate and may prevent or prevent impurities and moisture from penetrating from the substrate into the display unit (i.e., the organic light emitting element).

Wherein the barrier layer 110 may include a first barrier layer 12 and a second barrier layer 14. The second barrier layer 14 is formed on the first barrier layer 12, for example, the first barrier layer 12 may be formed between the second barrier layers 14 and the substrate 100. In practice, the first sub-barrier layer 12 may be formed by depositing silicon oxide and subsequently, the second sub-barrier layer 14 is formed by depositing silicon nitride by an in-situ process. In this case, the first sub-barrier layer 12 may be made of SiO _x Or SiON (which may enhance the interfacial bonding property between the barrier layer 110 and the substrate 100), and the first sub-barrier layer 12 may be formed to have a thickness of about 100nm to about 600 nm. The second sub-barrier layer 14 may be made of SiN _x Or SiON (which may enhance the interfacial bonding property between the barrier layer 110 and the buffer layer 120 provided later), and the second sub-barrier layer 14 may be formed to have a thickness of about 50nm to about 200 nm.

A buffer layer 120 formed on the barrier layer 110. Buffer layer 120 may include one or more inorganic insulating layers including materials such as silicon oxide or silicon nitride. The buffer layer 120 may provide a planarization layer on an upper surface of the substrate, and may prevent or prevent impurities and moisture from penetrating from the substrate into the display unit (i.e., the organic light emitting element).

Wherein the buffer layer 120 comprises a first sub-buffer layer 22 formed of, for example, silicon nitride and a second sub-buffer layer 24 formed of, for example, silicon oxide. The second sub-barrier layer 14 and the first sub-buffer layer 22 may be formed of silicon nitride having the same film quality (e.g., the same density and the same film stress), and an oxide film may be positioned at an interface between the second sub-barrier layer 14 and the first sub-buffer layer 22. The oxide film may be a natural oxide film formed between the process of forming the second sub-barrier layer 14 and the process of forming the first sub-buffer layer 22, and may have a thickness of several tens of angstroms or less. In practical applications, the thickness of the first sub-buffer layer 22 may be about 50nm to 100nm, and the thickness of the second sub-buffer layer 24 may be about 100nm to 300nm.

A semiconductor 135 formed on the buffer layer 120, wherein the semiconductor 135 is formed of polysilicon. The semiconductor 135 is divided into a channel region 1355, and a source region 1356 and a drain region 1357 formed on both sides of the channel region 1355. The channel region 1355 of the semiconductor 135 is polysilicon, i.e., an intrinsic semiconductor, which is not doped with impurities. The source region 1356 and the drain region 1357 are polysilicon doped with conductive impurities, i.e., impurity semiconductors. The impurities doped in the source and drain regions 1356 and 1357 may be any one of P-type impurities and N-type impurities.

In other embodiments, the semiconductor 135 may be a metal oxide semiconductor, and may specifically be at least one of IGZO (indium gallium zinc oxide), IGTO (indium gallium tin oxide), IZTO (indium zinc tin oxide), and IGZTO (indium gallium zinc tin oxide).

A gate insulating layer 140 is formed on the semiconductor 135. The gate insulating layer 140 may be a plurality of layers or a single layer including at least one of tetraethyl orthosilicate (TEOS), silicon nitride, silicon oxide, and the like.

A gate electrode 155 formed on the gate insulating layer 140, and the gate electrode 155 overlaps the channel region 1355. The gate electrode 155 may be formed as a plurality of layers or a single layer including a low resistance material such as Al, ti, mo, cu, ni, or an alloy thereof, or a material having high corrosion preventing properties.

A first interlayer insulating layer 160 is formed on the gate electrode 155. The first interlayer insulating layer 160 may be formed as a plurality of layers or a single layer formed of, for example, tetraethyl orthosilicate (tetraethyl orthosilicate, TEOS), silicon nitride, or silicon oxide. Wherein the first interlayer insulating layer 160 and the gate insulating layer 140 include a source contact hole 66 and a drain contact hole 67, and the source region 1356 and the drain region 1357 are exposed through the source contact hole 66 and the drain contact hole 67, respectively.

The source electrode 176 and the drain electrode 177 are formed on the first interlayer insulating layer 160. The source electrode 176 is connected to the source region 1356 through the source contact hole 66, and the drain electrode 177 is connected to the drain region 1357 through the drain contact hole 67. Among them, the source electrode 176 and the drain electrode 177 may be formed as a plurality of layers or a single layer of a low-resistance material such as Al, ti, mo, cu, ni, or an alloy thereof, or a material having high corrosion resistance. For example, the source electrode 176 and the drain electrode 177 may be triple layers of Ti/Cu/Ti, ti/Ag/Ti, ti/Al/Ti or Mo/Al/Mo, among others.

In addition, the gate electrode 155, the source electrode 176, and the drain electrode 177 are a control electrode, an input electrode, and an output electrode of a thin film transistor in the display panel driving circuit, respectively, and form a thin film transistor together with the semiconductor 135. A channel of the thin film transistor is formed in the semiconductor 135 between the source electrode 176 and the drain electrode 177.

A second interlayer insulating layer 180 is formed on the source electrode 176 and the drain electrode 177. The second interlayer insulating layer 180 includes a via hole 85, and the drain electrode 177 is exposed through the via hole 85. Among them, the second interlayer insulating layer 180 may be formed as a plurality of layers or a single layer formed of, for example, tetraethyl orthosilicate (tetraethyl orthosilicate, TEOS), silicon nitride, or silicon oxide, and may be formed of an organic material having a low dielectric constant (for example, polyimide).

The first electrode 710 is formed on the second interlayer insulating layer 180. The first electrode 710 is electrically connected to the drain electrode 177 through the via hole 85, and may be an anode of an organic light emitting diode of the display panel.

The pixel defining layer 190 is formed on the first electrode 710. Wherein the pixel defining layer 190 has an opening 95, and the first electrode 710 is exposed through the opening 95. The pixel defining layer 190 may be formed to include a resin such as polyacrylate or polyimide, a silica-based organic material, or the like.

A light emitting material layer 720 is formed in the opening 95 of the pixel defining layer 190. A hole-functional layer, such as a Hole Injection Layer (HIL) and a Hole Transport Layer (HTL) (not shown in the figure), is further disposed between the light-emitting material layer 720 and the first electrode 720, and an electron-functional layer, such as an Electron Transport Layer (ETL) and an Electron Injection Layer (EIL) (not shown in the figure), is disposed on a side of the light-emitting material layer 720 facing away from the first electrode 720.

A second electrode 730 formed on the pixel defining layer 190 and the light emitting material layer 720. The second electrode 730 is a cathode of the organic light emitting diode. Accordingly, the first electrode 710, the light emitting material layer 720, the hole functional layer, the electron functional layer, and the second electrode 730 form the organic light emitting element 70.

Among them, the organic light emitting diode display may have any one of a top display type, a bottom display type, and a dual display type according to the direction of light emitted by the organic light emitting element 70.

In the top display type, the first electrode 710 is formed as a reflective layer, and the second electrode 730 is formed as a semi-transmissive layer or a transmissive layer. On the other hand, in the case of the bottom display type, the first electrode 710 is formed as a semi-transmissive layer, and the second electrode 730 is formed as a reflective layer. In addition, in the case of the dual display type, the first electrode 710 and the second electrode 730 are formed as a transparent layer or a semi-transmissive layer.

The reflective layer and the semi-transmissive layer are made by using one or more metals such as magnesium (Mg), silver (Ag), gold (Au), calcium (Ca), lithium (Li), chromium (Cr), and aluminum (Al), or an alloy thereof. The reflective layer and the semi-transmissive layer are determined by thicknesses, and as the thicknesses thereof become smaller, the transmittance increases, so the semi-transmissive layer may be formed to have a thickness of about 200nm or less. The transparent layer is made of a material such as Indium Tin Oxide (ITO), indium Zinc Oxide (IZO), zinc oxide (ZnO) or indium oxide (In) ₂ O ₃ ) Is formed of the material of (a).

The encapsulation layer 260 is formed on the second electrode 730. Wherein the encapsulation layer 260 may be formed by alternately layering one or more organic layers and one or more inorganic layers. The inorganic layer or the organic layer may each be provided in plurality.

Wherein the organic layer is formed of a polymer, and may be a laminate layer or a single layer formed of any one of polyethylene terephthalate, polyimide, polycarbonate, epoxy, polyethylene, and polyacrylate, for example. The organic layer may be formed of polyacrylate, specifically including a substance obtained by polymerizing a monomer composition including a diacrylate-based monomer and a triacrylate-based monomer. Monoacrylate-based monomers may also be included in the monomer composition. In addition, monomer compositions may also includeWell-known photoinitiators such as TPO, but the monomer composition is not limited thereto. The inorganic layer may be a laminate layer or a single layer including a metal oxide or a metal nitride. For example, the inorganic layer may include SiN _x 、Al ₂ O ₃ 、SiO ₂ And TiO ₂ Any one of them.

The uppermost layer of the encapsulation layer 260 exposed to the outside may be formed of an inorganic layer to prevent moisture from being transferred to the inside of the organic light emitting diode display. The encapsulation layer 260 may include at least one sandwich structure in which at least one organic layer is interposed between at least two inorganic layers. In addition, the encapsulation layer 260 may include at least one sandwich structure in which at least one inorganic layer is interposed between at least two organic layers.

The encapsulation layer 260 may sequentially include a first inorganic layer, a first organic layer, and a second inorganic layer on the second electrode 730. In addition, the encapsulation layer 260 may sequentially include a first inorganic layer, a first organic layer, a second inorganic layer, a second organic layer, and a third inorganic layer on the second electrode 730. In addition, the encapsulation layer 260 may sequentially include a first inorganic layer, a first organic layer, a second inorganic layer, a second organic layer, a third inorganic layer, a third organic layer, and a fourth inorganic layer on the second electrode 730.

In addition, a metal halide layer may be additionally included between the second electrode 730 and the first inorganic layer, wherein the metal halide layer includes LiF, for example. The halogenated metal layer may prevent the second electrode 730 from being damaged when the first inorganic layer is formed by a sputtering method or a plasma deposition method.

The first organic layer has an area smaller than that of the second inorganic layer, and the second organic layer has an area smaller than that of the third inorganic layer. Furthermore, the first organic layer is entirely covered by the second inorganic layer, and the second organic layer is entirely covered by the third inorganic layer.

In some embodiments of the present application, the first direction X is a row direction, and the second direction Y is a column direction. The long axis length W1 of the plurality of sub-pixels 11 of the same color in each column changes irregularly. An element "irregular change" in the embodiments of the present application refers to an element that does not change regularly, and there is no linear change relationship or curvilinear change relationship. For example, the long axis length W1 of the plurality of sub-pixels 11 of the same color in each column changes irregularly, which means that the long axis length of the sub-pixels of the same color changes neither longer nor shorter in the direction from top to bottom or from bottom to top in each column, and is in irregular change. For example, the length W1 of the long axis of the plurality of sub-pixels 11 of the same color in the same column may be gradually increased, gradually decreased, and then maintained unchanged, and then gradually increased. Or the materials can be kept consistent, gradually reduced, gradually increased, kept unchanged and then gradually increased. Or gradually decreasing, keeping unchanged, gradually increasing, and gradually decreasing. That is, in the plurality of sub-pixels having the same color in the same column, there are two or more sub-pixels having the same long axis length and the same long axis length, and the sub-pixels having the same long axis length may be arranged adjacently or continuously, but the number is not limited, and the sub-pixels may be arranged at intervals. The principle is that the lengths of long axes of a plurality of sub-pixels with the same color in the same column are irregularly changed. As shown in fig. 2, the inkjet printing direction is the same as the column direction, and in the inkjet printing direction, the size of the sub-pixels 11 of the same color is designed differently, so that the size of the sub-pixels 11 of the same color is irregularly changed, and the linear mura can be broken, and is not in a line any more, so that the linear mura is visually eliminated.

In some embodiments, the lengths W1 of the long axes of the plurality of sub-pixels 11 with the same color in the same column may alternately change in a gradually increasing and gradually decreasing manner, or may alternately change in a gradually decreasing and gradually increasing manner. The number of progressively larger and progressively smaller regions depends on the size of the display set. The gradually-increased area is marked as an A area, the gradually-reduced area is marked as a B area, and the sizes of different A areas can be the same or different, namely the numbers of the sub-pixels corresponding to the different A areas can be the same or different; the sizes of the different B regions may be the same or different, i.e., the number of sub-pixels corresponding to the different B regions may be the same or different. The size of the a region may be the same as or different from the size of the B region, i.e., the number of sub-pixels corresponding to the a region and the B region may be the same or different.

As shown in fig. 3, in some embodiments of the present application, the number of pixel units 10 in each display group 101 is the same and the array distribution rule is the same. The "same array distribution rule" includes, but is not limited to, the same arrangement order of the sub-pixels of different colors of each pixel unit 10. For example, the size of each display group 101 may be 10mm×10mm, and the number of pixel units 10 of each display group 101 may be 100×100, i.e., the number of sub-pixels 11 of each display group 101 may be 100×100×3. The long axis length W1 between the corresponding sub-pixels 11 of different display groups 101 is the same, for example, the long axis length W1 of the sub-pixels 11 of the first row and the first column of each display group 101 is the same, the long axis length W1 of the sub-pixels 11 of the first row and the second column of each display group 101 is the same, and the arrangement rule of the different display groups 101 and the size design of the sub-pixels 11 at the corresponding positions are the same, so that the effect of breaking the linear mura can be achieved, the difficulty in the process can be reduced, and the mass production of products is facilitated.

As shown in fig. 4, in some embodiments, the number of pixel units 10 of at least two display groups 101 is the same and the array distribution rule is the same, and the lengths of the long axes of the corresponding sub-pixels of the at least two display groups 101 are different. For example, the number of the pixel units 10 of the two adjacent display groups 101 (hereinafter referred to as a first display group 101A and a second display group 101B) is the same, and the array distribution is the same (for example, schematically, the pixel units are arranged in 9 rows by 3 columns, the arrangement order of the sub-pixels of different colors of each pixel unit is the same), but the long axis lengths of the sub-pixels of the first display group 101A and the second display group 101B are different, for example, the long axis length of the first red (R) sub-pixel of the first column of the first display group 101A is greater than the long axis length of the first red (R) sub-pixel of the first column of the second display group 101B, and the long axis length of the second R sub-pixel of the first column of the first display group 101A is less than the long axis length of the second R sub-pixel of the first column of the second display group 101B.

As shown in fig. 4, in some embodiments, the sizes of different display groups may be different, i.e., the number of pixel units 10 of different display groups 101 may be different, which may further function as a break in the linear mura. Of the plurality of display groups 101, a portion of the display groups 101 may have the same size (e.g., the first display group 101A and the second display group 101B may have the same size), and a portion of the display groups 101 may have different sizes (e.g., the first display group 101A and the third display group 101C may have different sizes). The display groups 101 with the same size can be adjacently arranged or can be arranged at intervals; the display groups 101 of different sizes may be disposed adjacent to each other or may be disposed at intervals.

In some embodiments, the long axis length variation rule between the subpixels of different display groups 101 may be different, which may further function as a break in the linear mura. In the plurality of display groups 101, the long axis length variation rule between the corresponding sub-pixels of one portion of the display groups may be the same, and the long axis length variation rule between the corresponding sub-pixels of the other portion of the display groups may be different. As shown in fig. 4, for example, the long axis length variation rule of the green (G) sub-pixels in the first column of the first display area 101A is different from the long axis variation rule of the green sub-pixels in the first column of the second display area 101B. The display groups with the same length change rule of the long axis of the sub-pixel can be adjacently arranged or arranged at intervals, and the display groups with different length change rules of the long axis of the sub-pixel can be adjacently arranged or arranged at intervals.

Since the openings 95 of the pixel defining layer 190 are in one-to-one correspondence with the sub-pixels 11 for accommodating the luminescent material of the sub-pixels 11, the long axis length of the sub-pixels 11 refers to the length of the luminescent material layer of the sub-pixels along the first direction X. The size of the sub-pixel 11 size can be achieved by controlling the size of the opening 95 in the pixel defining layer 190. As shown in fig. 5, in some embodiments of the present application, among a plurality of openings 95 corresponding to a plurality of sub-pixels 11 arranged along the second direction Y and extending identically, at least two openings have a difference in length W2 along the first direction X, so that long axis lengths of light emitting material layers of two sub-pixels of the same color correspondingly formed subsequently are different. In some embodiments, the absolute value of the difference in the length W2 of the at least two openings is greater than 0 and less than 10 microns. Specifically, lengths W2 of the plurality of openings 95 corresponding to the plurality of sub-pixels 11 arranged along the second direction Y and having the same extension are different as much as possible, so as to break the linear rule change to the greatest extent, and thus, the effect of eliminating the linear mura is most obvious. The absolute value of the difference is within the range, so that on one hand, the display brightness is not affected, and on the other hand, the linear mura can be obviously eliminated.

When the same color sub-pixels 11 of each column are used in the inkjet printing, the same nozzle is used for each sub-pixel 11 of the same color in each column, different nozzles are used for each sub-pixel 11 of the same color in different columns, and when a plurality of columns of sub-pixels 11 of the same color are printed at the same time, the printing volume parameters set by the corresponding plurality of nozzles are the same, but the volume of ink drops actually ejected by each nozzle is different due to the fact that the physical hardware of each nozzle is different, so that a linear mura is formed due to the volume difference between adjacent pixel columns in the printing direction. For example, the volume parameter set for each nozzle for printing the red luminescent material is 10pL, but in practice, the volume that the nozzle corresponding to the first column of red sub-pixels 11 may print is 10pL, the volume that the nozzle corresponding to the second column of red sub-pixels 11 may print is 9pL, the volume that the nozzle corresponding to the third column of red sub-pixels 11 may print is 10pL, and the volume that the nozzle corresponding to the fourth column of red sub-pixels 11 may print is 7pL. So that the sub-pixels 11 of different columns are visually present in a linear mura.

Since the disadvantage of the difference in hardware of the nozzle itself is difficult to improve, the embodiment of the present application eliminates the linear mura by improving the size of the sub-pixel 11. Although the size of the sub-pixels 11 is changed in the present application, the original process parameters can be used for inkjet printing, and no adjustment is necessary. In the embodiment of the present application, the volumes of the light emitting material layers of the plurality of sub-pixels 11 of the same color arranged (in the same column) along the second direction Y are the same. Further, the film thickness of the light emitting material layer of the plurality of sub-pixels 11 of the same color arranged along the second direction Y is inversely proportional to the length of the corresponding opening 95 along the first direction X. In the openings 95 corresponding to the same-color sub-pixels 11 in the same column, the larger the length of the openings 95, the larger the area of the openings 95, and the larger the leveling area of the luminescent material to be ink-jet printed in the openings 95, the thinner the film thickness of the luminescent material layer to be formed.

The length of the luminescent material layer of the sub-pixel 11 along the first direction X is proportional to the length of the opening 95 along the first direction X.

In the embodiments of the present application, the volumes of the luminescent material layers of the same color sub-pixels 11 of different columns are different.

In some embodiments of the present application, with the second direction Y as a column direction, the length W1 of the long axis of the first subpixel 11 appearing in sequence in the plurality of subpixels 11 with the same color in each column is greater than the length W1 of the long axes of the other subpixels 11 with the same color in the column.

For example, taking an 8K (resolution size 7680x4320) display panel of 65inch as an example, the first R (red) subpixel 11 in one column in one display group 101 is 150 (long axis direction) μm×50 (short axis direction) μm, and the sizes of the other sequentially arranged R subpixels 11 in the column are shown in table 1 below.

TABLE 1

By testing the display panel in the above embodiment, as shown in fig. 6 and 7, fig. 6 is a test chart of a display screen of the existing display panel in a dark state, and fig. 7 is a test chart of a display screen of the display panel provided in the embodiment of the present application in a dark state, where the dark state includes a low gray level and a black state, the size of each R sub-pixel 11 of the display panel corresponding to fig. 6 is designed to be 150×50 μm, the short axis of each R sub-pixel 11 of the display panel corresponding to fig. 7 is 50 μm, and the size of the long axis of each R sub-pixel 11 of the same color is greater than 140 μm and less than 50 μm. From fig. 6 and fig. 7, the conventional linear mura of the display panel is serious, and the display panel provided in the embodiment of the application can break the linear mura, which is beneficial to mass production of products.

Based on the display panel, the embodiment of the application provides a display device, which comprises the display panel in the embodiment. Including but not limited to televisions, electronic billboards, monitor screens, etc.

In summary, the embodiments of the present application provide a display panel and a display device, where the display panel includes a plurality of display groups 101 distributed in an array, each display group 101 includes a plurality of pixel units 10 distributed in an array along a first direction X and a second direction Y, each pixel unit 10 includes a plurality of sub-pixels 11 arranged along the second direction Y and having different colors, and long axes of the sub-pixels 11 extend along the first direction X; among the plurality of sub-pixels 11 having the same color arranged in the second direction Y, the lengths W1 of the long axes of at least two sub-pixels are different. The present application can eliminate the linear mura by differently designing the long axis lengths W1 of the same color sub-pixels 11 in the same printing direction.

The foregoing has described in detail a display panel and a display device provided by embodiments of the present application, and specific examples have been applied herein to illustrate the principles and embodiments of the present application, where the foregoing examples are provided to assist in understanding the methods and core ideas of the present application; meanwhile, those skilled in the art will have variations in the specific embodiments and application scope in light of the ideas of the present application, and the present description should not be construed as limiting the present application in view of the above.

Claims

1. A display panel, wherein the display panel comprises at least one display group, the display group comprising:

2. The display panel of claim 1, wherein an absolute value of a difference between long axis lengths of the at least two of the sub-pixels is greater than 0 and less than 10 microns.

3. The display panel according to claim 1 or 2, wherein lengths of long axes of a plurality of sub-pixels of the same color in the same column arranged in the second direction change irregularly.

4. The display panel according to claim 2, wherein the display panel comprises a plurality of the display groups, the number of pixel units of each display group is the same and the array distribution rule is the same, and the long axis lengths of the corresponding sub-pixels of different display groups are the same.

5. The display panel according to claim 2, wherein the display panel comprises a plurality of the display groups, the pixel units of at least two of the display groups are the same in number and are distributed in an array with the same rule, and the lengths of the long axes of the corresponding sub-pixels of the at least two display groups are different.

6. The display panel of claim 1, further comprising:

a substrate;

7. The display panel of claim 6, wherein each of the subpixels comprises an anode disposed on the substrate, a luminescent material layer disposed on the anode, and a cathode disposed on the luminescent material layer, the luminescent material layer being positioned within the corresponding opening, wherein,

8. The display panel according to claim 6, wherein the volumes of the light emitting material layers of the plurality of same-color sub-pixels arranged in the same column along the second direction are the same;

and/or the volumes of the luminescent material layers of the same-color sub-pixels of different columns arranged along the second direction are different.

9. The display panel of claim 1, wherein, with the second direction as a column direction, a length of a major axis of a first subpixel in a sequence among the plurality of subpixels of the same color in each column is greater than a length of major axes of other subpixels of the same color in the column.

10. A display device comprising a display panel according to any one of claims 1-9.