CN111900188B - Display substrate and display device - Google Patents
Display substrate and display device Download PDFInfo
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- CN111900188B CN111900188B CN202010783845.8A CN202010783845A CN111900188B CN 111900188 B CN111900188 B CN 111900188B CN 202010783845 A CN202010783845 A CN 202010783845A CN 111900188 B CN111900188 B CN 111900188B
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
- H10K59/122—Pixel-defining structures or layers, e.g. banks
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/86—Arrangements for improving contrast, e.g. preventing reflection of ambient light
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/30—Devices specially adapted for multicolour light emission
- H10K59/35—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels
Abstract
The embodiment of the invention provides a substrate for display and a display device, relates to the technical field of display, and can solve the problem of cross color of ink mutual flow between openings of adjacent rows or columns; the second retaining walls are arranged between two adjacent first retaining walls, and the first retaining walls and the second retaining walls are connected and arranged around the opening; the height of the first retaining wall is greater than that of the second retaining wall, and the height is perpendicular to the substrate; the opening part is used for containing ink; the third retaining wall is arranged on the surface of one side, far away from the substrate, of the first retaining wall; the third retaining walls are arranged on two sides of the second retaining wall; the third retaining wall is made of lyophobic material; the lyophobic material has lyophobic property for the ink.
Description
Technical Field
The present application relates to the field of display technologies, and in particular, to a display substrate and a display device.
Background
Electroluminescent display devices have advantages of self-luminescence, low power consumption, wide viewing angle, fast response speed, and high contrast, and thus become the mainstream trend of current display devices.
At present, an Ink-Jet Printing (IJP) process is often used to form a light-emitting layer in an opening portion of a pixel defining layer.
Disclosure of Invention
Embodiments of the present application provide a display substrate and a display device, which can solve the problem of cross color of ink flowing between openings of adjacent rows or columns.
In order to achieve the above purpose, the embodiment of the present application adopts the following technical solutions:
in one aspect, a substrate for display includes: a substrate; a pixel defining layer disposed on the substrate; the pixel defining layer comprises a plurality of first retaining walls, a plurality of second retaining walls, a plurality of opening parts and a plurality of third retaining walls; the second retaining walls are arranged between two adjacent first retaining walls, and the first retaining walls and the second retaining walls are connected and arranged around the opening; the height of the first retaining wall is greater than that of the second retaining wall, and the height is perpendicular to the substrate; the opening part is used for containing ink; the third retaining wall is arranged on the surface of one side, far away from the substrate, of the first retaining wall; the third retaining walls are arranged on two sides of the second retaining wall; the third retaining wall is made of lyophobic material; the lyophobic material has lyophobic property for the ink.
In some embodiments, the first retaining wall comprises a first material layer and a second material layer sequentially away from the substrate; the first material layer and the second retaining wall are made of the same material; the second retaining wall is made of a lyophilic material, and the lyophilic material has lyophilic performance on the ink; the material forming the second material layer is the lyophobic material.
In some embodiments, the substrate for display further includes a light emitting layer provided in the opening portion; the ink is used for forming the light-emitting layer; the range of the difference delta H between the height of the first retaining wall and the height of the light-emitting layer is delta H which is less than or equal to 0.7 um.
In some embodiments, the height of the third retaining wall is greater than the height of the first retaining wall.
In some embodiments, the height H1 of the first retaining wall ranges from 0.3um to H1 to 1 um; the range of the height H2 of the second retaining wall is more than or equal to 0.1um and less than or equal to H2 and less than or equal to 0.6 um; the range of the height H3 of the third retaining wall is H3 not less than 1 um.
In some embodiments, the range of the wall thickness D1 of the first retaining wall is 5um to D1 to 50 um; the wall degree D2's of second barricade scope is 10um and is less than or equal to D2 and is less than or equal to 100 um.
In some embodiments, the longitudinal cross-sections of the first retaining wall, the second retaining wall, and the third retaining wall are all trapezoidal; the longitudinal section is vertical to the substrate and parallel to the wall thickness direction of the first retaining wall; the upper bottoms of the longitudinal sections of the first retaining wall and the third retaining wall are far away from the substrate, and the lower bottoms are close to the substrate; the upper bottom of the longitudinal section of the second retaining wall is close to the substrate, and the lower bottom of the longitudinal section of the second retaining wall is far away from the substrate.
In some embodiments, the longitudinal cross-sections of the first retaining wall, the second retaining wall, and the third retaining wall are all trapezoidal; the longitudinal section is vertical to the substrate and is parallel to the wall thickness direction of the first retaining wall; the upper bottoms of the longitudinal sections of the second retaining wall and the third retaining wall are far away from the substrate, and the lower bottoms are close to the substrate; the upper bottom of the longitudinal section of the first retaining wall is close to the substrate, and the lower bottom of the longitudinal section of the first retaining wall is far away from the substrate.
In some embodiments, an included angle between a surface of the second retaining wall on a side away from the substrate and a surface of the first retaining wall on a side close to the second retaining wall ranges from 10 ° to 70 °.
On the other hand, a display device is provided, which comprises the display substrate.
The embodiment of the invention provides a substrate for display and a display device, wherein the pixel defining layer further comprises a third retaining wall, the third retaining wall is arranged on the surface of one side of the first retaining wall, which is far away from the substrate, the two sides of the second retaining wall are provided with the third retaining wall, namely the third retaining wall is positioned at the crossed position of the first retaining wall and the second retaining wall, namely the height of the crossed position of the first retaining wall and the second retaining wall is increased, and the third retaining wall is made of a lyophobic material, and the lyophobic material has lyophobic performance on ink, so that the third retaining wall can effectively prevent ink among sub-pixels of adjacent rows or columns from flowing mutually to cause color crosstalk, and further the display effect of the display device is improved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram of a display device according to an embodiment of the present invention;
fig. 2 is a schematic diagram illustrating region division of a display panel according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a display panel according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a pixel defining layer according to an embodiment of the present invention;
FIG. 5 is a schematic structural diagram of another pixel defining layer according to an embodiment of the present invention;
FIG. 6 is a schematic structural diagram of another pixel defining layer according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a pixel definition layer provided in the related art;
FIG. 8 is a schematic cross-sectional view in the direction AA' of FIG. 4;
FIG. 9 is a schematic cross-sectional view of FIG. 4 in the direction BB';
FIG. 10 is a schematic cross-sectional view taken along line CC' of FIG. 4;
FIG. 11 is a schematic cross-sectional view taken in direction DD' of FIG. 4;
fig. 12 is a schematic cross-sectional view in the direction CC' of fig. 4.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the following, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.
Further, in this application, directional terms such as "upper," "lower," "left," "right," and the like may be used in a generic and descriptive sense only and not for purposes of limitation, with respect to the orientation of components in the figures, but also with respect to the orientation of components in the figures.
In the present application, unless expressly stated or limited otherwise, the term "coupled" is to be construed broadly, e.g., "coupled" may be a fixed connection, a removable connection, or an integral part; may be directly connected or indirectly connected through an intermediate.
The embodiment of the invention provides a display device which can be a product or a component with any display function, such as a display, a television, a digital camera, a mobile phone, a tablet personal computer, an electronic photo frame and the like.
The electroluminescent Display device provided in the embodiment of the present invention may be an Organic electroluminescent Display device (Organic Light-Emitting Diode Display, abbreviated as OLED); the Display device may also be a Quantum Dot Light Emitting Display (QLED for short).
As shown in fig. 1, the main structure of the display device includes a frame 1, a cover plate 2, a display panel 3, a circuit board 4, and other components. Here, the display panel 3 may be a flexible display panel or a rigid display panel. In the case where the display panel 3 is a flexible display panel, the display device is a flexible display device.
The longitudinal section of the frame 1 is U-shaped, the display panel 3, the circuit board 4 and other accessories are all arranged in the frame 1, the circuit board 4 is arranged below the display panel 3 (i.e. the back face, the face deviating from the display face of the display panel 3), and the cover plate 2 is arranged on one side of the display panel 3 far away from the circuit board 4.
It should be noted that the Circuit Board 4 is electrically connected to the display panel 3, and the Circuit Board 4 generally includes a Flexible Printed Circuit (FPC), a driver chip (IC), a Printed Circuit Board (PCB), a connection substrate, and the like; the circuit board 4 is used to supply various display screen information to the display panel 3 after power is turned on.
The embodiment of the invention provides a display panel 3, which can be applied to the display device. As shown in fig. 2, the display panel 3 is divided into a display Area a1(Active Area, abbreviated as AA Area) and a peripheral Area a2 located at least on one side of the display Area a1, and fig. 2 illustrates that the display Area a1 is surrounded by the peripheral Area a 2. The display area a1 includes a plurality of subpixels P. The sub-pixel P includes at least a red sub-pixel R, a green sub-pixel G, and a blue sub-pixel B. In some embodiments, as shown in fig. 2, a row of red subpixels R, a row of green subpixels G, and a row of blue subpixels B are alternately arranged in sequence. The peripheral region a2 is used for wiring, and the gate driver circuit may be provided in the peripheral region a 2.
As shown in fig. 3, the display panel 3 includes a display substrate 31 and an encapsulating layer 32 for encapsulating the display substrate 31. Here, the encapsulation layer 32 may be an encapsulation film; or may be a package substrate. When the sealing layer 32 is a sealing film, the number of the sealing films included in the sealing layer 32 is not limited, and the sealing layer 32 may include one sealing film, or the sealing layer 32 may include two or more sealing films stacked one on another. In some embodiments, encapsulation layer 32 comprises three layers of encapsulation film disposed in a sequential stack.
In the case that the encapsulation layer 32 includes three encapsulation films sequentially stacked, optionally, the encapsulation film located in the middle layer is made of an organic material, and the encapsulation films located at both sides are made of an inorganic material.
Here, the organic material is not limited, and the organic material may be, for example, PMMA (Polymethyl methacrylate). The inorganic material is not limited, and may be one or more of SiNx (silicon nitride), SiOx (silicon oxide), or SiOxNy (silicon oxynitride), for example.
On the basis, the encapsulation film located in the intermediate layer can be manufactured by using an Ink Jet Printer (IJP for short). Further, the encapsulation films on both sides can be formed by Chemical Vapor Deposition (CVD).
The embodiment of the invention provides a display substrate 31, which can be applied to the display panel 3. As shown in fig. 4 and 5, the display substrate 31 includes a substrate (the substrate is not illustrated in fig. 4 and 5) and a pixel defining layer 311 provided on the substrate.
The pixel defining layer 311 includes a plurality of first walls 312, a plurality of second walls 313, a plurality of openings 314, and a plurality of third walls 315; the second retaining wall 313 is arranged between two adjacent first retaining walls 312, and the first retaining wall 312 and the second retaining wall 313 are connected and surround the opening 314; the height of the first retaining wall 312 is greater than that of the second retaining wall 313, and the height is vertical to the substrate; the opening 314 accommodates ink.
The specific number of "a plurality" is not limited. Illustratively, "a plurality" means "at least two".
Referring to fig. 4 and 5, in the embodiment of the invention, the first retaining wall 312 is a strip structure, and the second retaining wall 313 is a block structure.
In some embodiments, as shown in fig. 4, the first retaining walls 312 are sequentially arranged along the column direction (downward direction), and the second retaining walls 313 are sequentially arranged along the row direction (rightward direction), and are located between two adjacent first retaining walls 312. In this case, the subpixel P includes a row of red subpixels R, a row of green subpixels G, and a row of blue subpixels B, which are alternately arranged in sequence.
In other embodiments, as shown in fig. 5, the first retaining walls 312 are sequentially arranged along the row direction, and the second retaining walls 313 are sequentially arranged along the column direction and are located between two adjacent first retaining walls 312. In this case, the subpixel P includes a row of red subpixels R, a row of green subpixels G, and a row of blue subpixels B alternately arranged in this order.
Referring again to fig. 4 and 5, a third wall 315 is located at the intersection of first wall 312 and second wall 313; the third wall 315 is made of a lyophobic material, which has lyophobic property for ink.
It should be noted that the "contact angle" refers to the angle between the solid-liquid boundary lines, and is a measure of the degree of wetting. If the contact angle of the solid material and water is greater than 90 degrees, the solid material is a lyophobic material, and the higher the contact angle of the solid material and water is, the better the lyophobic performance is. If the contact angle of the solid material and water is less than 90 degrees, the solid material is a lyophilic material, and the smaller the contact angle of the solid and water is, the better the lyophilic performance is.
On the basis, under the condition that the contact angle of the solid material and water is larger than 90 degrees, the contact angle between the solid material and ink is larger than 35 degrees; in the case where the contact angle of the solid material with water is less than 90 °, the contact angle between the solid material and the ink is less than 5 °. Based on this, in the embodiment of the present invention, if the contact angle between the material of the third retaining wall 315 and water is greater than 90 °, it indicates that the material of the third retaining wall 315 is a lyophobic material; if the contact angle between the material of the third wall 315 and the ink is greater than 35 °, it can also mean that the material of the third wall 315 is a lyophobic material. On the one hand, the contact angle between the material of the third blocking wall 315 and water can be used; on the other hand, the contact angle between the material of the third wall 315 and the ink can be used to determine whether the material of the third wall 315 is a lyophobic material.
It will be appreciated by those skilled in the art that the ink is a mixture comprising a solute and a solvent. The solute is organic electroluminescent material, and the solvent is Propylene Glycol Methyl Ether Acetate (PGMEA). Based on this, in the embodiment of the present invention, when the contact angle between the material of the third retaining wall 315 and the ink is greater than 35 °, that is, the contact angle between the material of the third retaining wall 315 and Propylene Glycol Methyl Ether Acetate (PGMEA) is greater than 35 °.
The definition of lyophobic properties is: the lyophobic material and the ink have a strong repulsive force therebetween, and the third blocking wall 315 is made of the lyophobic material, so that the third blocking wall 315 and the ink have a strong repulsive force therebetween, that is, the third blocking wall 315 and the Propylene Glycol Methyl Ether Acetate (PGMEA) have a strong repulsive force therebetween.
In some embodiments, the display substrate 31 further includes a light emitting layer disposed in the opening portion 314, the opening portion 314 is used to contain ink, and the ink is used to form the light emitting layer.
For example, in the field of electroluminescent display, a light-emitting layer is generally formed by an ink-jet printing method. The ink-jet printing comprises three steps of solution processing, printing and drying, wherein the ink is formed by the solution processing. Ink is dropped into the opening portion 314 by an ink jet printing apparatus, and excess solvent is removed by a subsequent process, thereby drying and forming a desired light emitting layer.
In the embodiment of the present invention, since the display area a1 of the display panel 3 includes a plurality of sub-pixels P, the sub-pixels P include a row of red sub-pixels R, a row of green sub-pixels G, and a row of blue sub-pixels B, which are alternately arranged in sequence; or the subpixel P includes a column of red subpixels R, a column of green subpixels G, and a column of blue subpixels B alternately arranged in sequence. It should be understood that the plurality of opening portions 314 correspond one-to-one to the plurality of sub-pixels P, and thus the light emitting layers are located within the sub-pixels P after the light emitting layers are formed within the opening portions 314. On this basis, a row of sub-pixels P or a column of sub-pixels P are light emitting layers of the same color, so that the color of light emitted by the row of sub-pixels P or the column of sub-pixels P is the same, and therefore the height of the first retaining wall 312 is set to be greater than the height of the second retaining wall 313, that is, ink can be contained in the area of the second retaining wall 313, and the area of the second retaining wall 313 does not emit light, so that the display effect of the whole display device is not affected.
As shown in fig. 6, in some embodiments, an inkjet printing apparatus (e.g., nozzles) is aligned with a region of the second blocking wall 313, and then ink is dropped into the region of the second blocking wall 313, and the ink is diffused into the opening portions 314 on both sides from the second blocking wall 313, so that the nozzles are only required to be disposed above the second blocking wall 313, and the nozzles are not required to be disposed above each opening portion 314, thereby reducing the number of nozzles and simplifying the structure of the inkjet printing apparatus. In this case, the arrangement of the first wall 312 and the second wall 313 included in the pixel defining layer 311 can be referred to as a connected pixel defining layer 311 structure.
However, in the structure of the connection type pixel defining layer 311, as shown in fig. 7, due to the pinning effect of the pixel defining layer 311, when ink is dropped into the region of the second retaining wall 313, the ink climbs at the edge where the second retaining wall 313 is connected to the first retaining wall 312, and since the second retaining wall 313 has a certain thickness, the height difference between the second retaining wall 313 and the first retaining wall 312 is small with respect to the height difference between the first retaining wall 312 and the opening 314, and the ink is dropped into the region of the second retaining wall 313, and is diffused into the opening 314 at both sides by the second retaining wall 313, thereby causing the ink to climb more seriously at the position where the first retaining wall 312 is connected to the second retaining wall 313, and when the ink is accumulated in the region of the second retaining wall 313, since the region of the second retaining wall 313 is small, the ink may also be overflowed from the edge of the first retaining wall 312, the light flows into the openings 314 of adjacent rows or adjacent columns, causing color crosstalk, which in turn affects display.
When the substrate 31 for display provided in the embodiment of the invention is used, the pixel defining layer 311 further includes the third retaining wall 315, the third retaining wall 315 is disposed on a side surface of the first retaining wall 312 away from the substrate 310, two sides of the second retaining wall 313 are provided with the third retaining wall 315, that is, the third retaining wall 315 is located at an intersection position of the first retaining wall 312 and the second retaining wall 313, that is, the height of the intersection position of the first retaining wall 312 and the second retaining wall 313 is increased, and the third retaining wall 315 is made of a liquid-repellent material, and the liquid-repellent material has a liquid-repellent property to ink, that is, the material of the third retaining wall 315 has a repulsive effect with the ink, so that the third retaining wall 315 can effectively prevent ink between the openings 314 of adjacent rows or columns from flowing and causing color crosstalk, thereby improving the display effect of the display device.
In some embodiments, as shown in fig. 8, fig. 8 is a schematic cross-sectional view in the direction AA' of fig. 4. The first retaining wall 312 includes a first material layer 3121 and a second material layer 3122 sequentially distant from the substrate 310; the first material layer 3121 and the second blocking wall 313 are the same layer; the second barrier 313 is made of lyophilic material, and the lyophilic material has lyophilic performance to ink; the material constituting the second material layer 3122 is a lyophobic material.
The term "same layer" refers to a layer structure formed by a single patterning process using the same mask plate after the same film formation process is used to form a film layer having a specific pattern. Depending on the specific pattern, the single patterning process may include multiple exposure, development or etching processes, and the specific pattern in the layer structure may be continuous or discontinuous, and the specific patterns may be at different heights or have different thicknesses. "same material", as the name implies, is the same material for two different layer structures. For example, the materials of the first material layer 3121 and the second retaining wall 313 are the same and are lyophilic materials.
The definition of lyophilic properties is: the lyophilic material and the ink have a strong attraction force, the second retaining wall 313 is made of the lyophilic material, and the first material layer 3121 and the second retaining wall 313 are made of the same material at the same layer, so that the first material layer 3121 and the second retaining wall 313 have a strong attraction force with the ink. Illustratively, the contact angle between the lyophilic material and the ink is less than 5 °, i.e., the contact angle between the materials of the first material layer 3121 and the second blocking wall 313 and the ink is less than 5 °.
With reference to the above embodiments, since the ink is a mixture including a solute and a solvent; the solute is organic electroluminescent material, and the solvent is Propylene Glycol Methyl Ether Acetate (PGMEA). Thus, in some embodiments, the lyophilic material has a contact angle with Propylene Glycol Methyl Ether Acetate (PGMEA), which is the solvent in the constituent ink, of less than 5 °.
The material forming the second material layer 3122 is a lyophobic material, and the lyophobic material can refer to the examples in the above embodiments, which are not described in detail herein.
In summary, the first retaining wall 312 includes a first material layer 3121 and a second material layer 3122 sequentially away from the substrate 310; the first material layer 3121 and the second barrier 313 are the same material; the second retaining wall 313 is made of lyophilic material, that is, the second retaining wall 313 and the first material layer 3121 are both made of lyophilic material, and the lyophilic material has lyophilic performance to ink, so that the bottom of the first retaining wall 312 has strong attraction to ink, and when ink flows into the opening 314, the ink can uniformly cover the entire opening 314, thereby facilitating the flatness of the ink in the opening 314; and when the ink is dropped into the region of the second retaining wall 313, the ink can be made to spread uniformly into the opening portions 314 on both sides in the region of the second retaining wall 313; on the basis, the material forming the second material layer 3122 is a lyophobic material, and the lyophobic material has lyophobic property for ink, so that the top of the first retaining wall 312 can repel ink, and thus, cross color between ink in the openings 314 of adjacent rows or columns can be prevented.
However, due to the characteristics of the material constituting the pixel defining layer 311, the low surface energy small molecules cannot be added too much (i.e., the lyophobic material cannot be added too much), and thus, after the film is dried and formed, the lyophilic ratio is excessively high (normally 60% to 80%) and the height of the first material layer 3121 is relatively large in proportion to the entire height of the first bank 312, so that after the light-emitting layer is formed in the opening 314, the light-emitting layer climbs over the edge of the opening 314, and the film thickness in the pixel is not uniform, and the luminance of the light emitted from the light-emitting layer is not uniform, which affects the display.
Based on this, in some embodiments, as shown in fig. 9, fig. 9 is a schematic cross-sectional view of fig. 4 in the direction BB'. The range of the difference Δ H between the height of the first bank 312 and the height of the light-emitting layer 316 is Δ H less than or equal to 0.7 um.
In general, the height of the light-emitting layer 316 is between 100nm and 300 nm. In this case, since the height of the light emitting layer 316 is not changed, when the height of the first wall 312 is correspondingly reduced, the difference Δ H between the height of the first wall 312 and the height of the light emitting layer 316 is reduced. Moreover, the smaller the difference Δ H between the height of the first wall 312 and the height of the light emitting layer 316 is, the lower the height of the first wall 312 is.
For example, when the difference Δ H between the height of the first wall 312 and the height of the light emitting layer 316 is 0um, the height of the first wall 312 is the same as the height of the light emitting layer 316.
It should be noted that, when the height of the first retaining wall 312 is reduced, the height of the first material layer 3121 and the height of the second material layer 3122 are reduced; further, in order to ensure the height difference between the first wall 312 and the second wall 313, it is ensured that the ink can flow into the opening portions 314 on both sides after the ink is dropped into the area of the second wall 313, and accordingly, the height of the second wall 313 is also reduced, that is, the height difference between the first wall 312 and the second wall 313 is not changed or is changed very little.
Based on the above, since the range of the difference Δ H between the height of the first retaining wall 312 and the height of the light emitting layer 316 is Δ H less than or equal to 0.7um, that is, the height of the first retaining wall 312 is reduced, so that the height of the first material layer 3121 is also reduced, and the ratio of the height of the first material layer 3121 to the height of the lyophilic material at the bottom of the first retaining wall 312 is reduced, after the ink is formed in the opening 314, the height of the light emitting layer 316 climbing over the edge of the opening 314 is reduced, and the uniformity of the film thickness of the light emitting layer 316 is improved, thereby improving the display effect.
In some embodiments, the height of the third wall 315 is greater than the height of the first wall 312.
With reference to the above embodiment, since the height of the first retaining wall 312 is greater than the height of the second retaining wall 313, and the height of the third retaining wall 315 is greater than the height of the first retaining wall 312, in the embodiment of the present invention, the relationship among the height of the first retaining wall 312, the height of the second retaining wall 313, and the height of the third retaining wall 315 is as follows: the height of the third wall 315 is greater than that of the first wall 312, and the height of the first wall 312 is greater than that of the second wall 313.
Illustratively, as shown in fig. 10 and 11, fig. 10 is a schematic cross-sectional view of fig. 4 in the direction CC'; fig. 11 is a schematic cross-sectional view in direction DD' of fig. 4. The range of the height H1 of the first retaining wall 312 is more than or equal to 0.3um and less than or equal to H1 and less than or equal to 1 um; the range of the height H2 of the second retaining wall 313 is more than or equal to 0.1um and less than or equal to H2 and less than or equal to 0.6 um; the height H3 of the third retaining wall 315 is H3 ≥ 1 um.
Since the height of the third wall 315 is greater than the height of the first wall 312, that is, the height of the third wall 315 is set higher in the embodiment of the present invention, the third wall 315 can further prevent the ink in the openings 314 between adjacent rows or columns from cross color.
Referring again to FIG. 4, in some embodiments, the wall thickness D1 of the first retaining wall 312 is in the range of 5um ≦ D1 ≦ 50 um; the range of the wall thickness D2 of the second baffle wall 313 is that D1 is more than or equal to 10um and less than or equal to 100 um.
Here, the wall thickness D1 of the first wall 312 is the distance between the boundary of the first wall 312 on the side close to the opening 314 and the boundary on the side far from the opening 314; the wall thickness D2 of the second retaining wall 313 is the distance between the boundary of the second retaining wall 313 on the side close to the opening 314 and the boundary on the side far from the opening 314.
The wall thickness D1 of the first retaining wall 312 will be explained with reference to the same opening 314 in fig. 4. That is, the "opening portion" in the interval between the boundary of the first wall 312 on the side close to the opening portion 314 and the boundary on the side far from the opening portion 314 is the same opening portion 314 as the wall thickness D1 of the first wall 312. Similarly, the explanation of the wall thickness D2 of the second retaining wall 313 is also explained with reference to the same opening 314 in fig. 4. That is, the "opening" in the distance between the boundary of the second retaining wall 313 on the side closer to the opening 314 and the boundary on the side farther from the opening 314 is the same opening 314 as the wall thickness D2 of the second retaining wall 313. For example, refer to the opening 314, which is labeled "A" in FIG. 4.
It should be understood that one pixel includes one red subpixel R, one green subpixel G, and one blue subpixel B, and the length of one pixel in the row direction is equal to the sum of the wall thickness D2 of one second barrier wall 313 and the length of one opening 314; the length of one pixel in the column direction is equal to the sum of the wall thicknesses D1 of the three first retaining walls 312. As is apparent from fig. 4, the wall thickness D2 of the second wall 313 is greater than the wall thickness D1 of the first wall 312.
Based on the above, in the embodiment of the present invention, the range of the wall thickness D1 of the first retaining wall 312 is 5um or more and D1 or more and 50um or less; the wall thickness D2 of the second wall 313 is 10 um-D1-100 um, which ensures that the length of a pixel in the row direction is equal to the length of a pixel in the column direction, i.e. the shape of the vertical projection of a pixel on the substrate 310 is square, thereby effectively avoiding the display device from displaying an image with malformation or displaying an image with inconsistent scale.
In some embodiments, as shown in fig. 10, the longitudinal sections of the first retaining wall 312, the second retaining wall 313 and the third retaining wall 315 are all trapezoidal; the longitudinal section is perpendicular to the substrate 310 and parallel to the wall thickness direction of the first retaining wall 312; wherein, the upper bottoms of the longitudinal section of the first retaining wall 312 and the longitudinal section of the third retaining wall 315 are far away from the substrate 310, and the lower bottoms are close to the substrate 310; the upper bottom of the longitudinal section of the second barrier wall 313 is close to the substrate 310 and the lower bottom is far from the substrate 310.
Here, the longitudinal section is a schematic sectional view in the direction CC' of fig. 4.
Those skilled in the art will appreciate that the parallel sides of the trapezoid are the base sides of the trapezoid, wherein the longer one is referred to as the lower base and the shorter one is referred to as the upper base.
On this basis, referring to fig. 10, the longitudinal section of the first retaining wall 312 and the third retaining wall 315 is a regular trapezoid, and the longitudinal section of the second retaining wall 313 is an inverted trapezoid.
In summary, in the embodiment of the present invention, the longitudinal sections of the first retaining wall 312, the second retaining wall 313 and the third retaining wall 315 are all trapezoidal, and the upper bottoms of the longitudinal sections of the first retaining wall 312 and the third retaining wall 315 are far away from the substrate 310, and the lower bottoms are close to the substrate 310; the upper bottom of the longitudinal section of the second retaining wall 313 is close to the substrate 310, and the lower bottom is far from the substrate 310, that is, the longitudinal sections of the first retaining wall 312 and the third retaining wall 315 are regular trapezoid, and the longitudinal section of the second retaining wall 313 is inverted trapezoid, so that the first retaining wall 312, the second retaining wall 313 and the third retaining wall 315 can be formed by one-time exposure and development process, thereby simplifying the process for manufacturing the pixel defining layer 311.
In some embodiments, as shown in fig. 12, the longitudinal sections of the first retaining wall 312, the second retaining wall 313 and the third retaining wall 315 are all trapezoidal; the longitudinal section is perpendicular to the substrate 310 and parallel to the wall thickness direction of the first retaining wall 312; wherein, the upper bottoms of the longitudinal sections of the second retaining wall 313 and the third retaining wall 315 are far away from the substrate 310, and the lower bottoms are close to the substrate 310; the upper base of the longitudinal section of the first retaining wall 312 is close to the substrate 310, and the lower base is far from the substrate 310.
For the explanation of the longitudinal section and the trapezoid, reference may be made to the above embodiments, and details are not repeated here.
Referring to fig. 12, the longitudinal section of the second retaining wall 313 and the longitudinal section of the third retaining wall 315 are regular trapezoids, and the longitudinal section of the first retaining wall 312 is an inverted trapezium.
Referring to fig. 12 again, in some embodiments, an included angle θ between a surface of the second retaining wall 313 on a side away from the substrate 310 and a surface of the first retaining wall 312 on a side close to the second retaining wall 313 ranges from 10 ° to 70 °.
In the embodiment of the present invention, since the upper bottom of the longitudinal section of the first retaining wall 312 is close to the substrate 310, and the lower bottom is far from the substrate 310, that is, the longitudinal section of the first retaining wall 312 is an inverted trapezoid, on this basis, the longitudinal section of the second retaining wall 313 and the upper bottom of the longitudinal section of the third retaining wall 315 are far from the substrate 310, and the lower bottom is close to the substrate 310, that is, the longitudinal section of the second retaining wall 313 and the longitudinal section of the third retaining wall 315 are regular trapezoids, such that the length of the longitudinal section of the third retaining wall 315 can be made longer, in other words, the area of the third retaining wall 315 can be enlarged, so that the third retaining wall 315 can accommodate more ink. Moreover, the included angle θ between the surface of the second wall 313 far from the substrate 310 and the surface of the first wall 312 near the second wall 313 is in the range of 10 ° to 70 °, that is, the included angle θ between the second wall 313 and the first wall 312 is an acute angle, so that after ink is dropped into the area of the third wall 315, cross color of ink flowing in the openings 314 between adjacent rows or columns can be further prevented.
Referring to fig. 10 and 12 again, the length of the upper base of the longitudinal section of the first retaining wall 312 is the same as that of the lower base of the longitudinal section of the third retaining wall 315, that is, the upper surface of the first retaining wall 312 coincides with the lower surface of the third retaining wall 315, so that the upper surface of the first retaining wall 312 and the lower surface of the third retaining wall 315 have uniform supporting force in all directions, thereby facilitating the stability of the pixel defining layer 311.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (9)
1. A substrate for display, comprising:
a substrate;
a pixel defining layer disposed on the substrate; the pixel defining layer comprises a plurality of first retaining walls, a plurality of second retaining walls, a plurality of opening parts and a plurality of third retaining walls; the second retaining wall is arranged between two adjacent first retaining walls, and the first retaining walls and the second retaining walls are connected and surround the periphery of the opening part; the height of the first retaining wall is greater than that of the second retaining wall, and the height is perpendicular to the substrate; the opening part is used for containing ink; the first retaining wall comprises a first material layer and a second material layer which are sequentially far away from the substrate; the first material layer and the second retaining wall are made of the same material; the second retaining wall is made of a lyophilic material, and the lyophilic material has lyophilic performance on the ink; the material for forming the second material layer is lyophobic material;
the third retaining wall is arranged on the surface of one side, far away from the substrate, of the first retaining wall; the third retaining walls are arranged on two sides of the second retaining wall; the third retaining wall is positioned at the crossing position of the first retaining wall and the second retaining wall; the third retaining wall is made of the lyophobic material; the lyophobic material has lyophobic property for the ink.
2. The substrate for display according to claim 1, further comprising a light-emitting layer provided in the opening; the ink is used for forming the light-emitting layer;
the range of the difference delta H between the height of the first retaining wall and the height of the light-emitting layer is delta H which is less than or equal to 0.7 um.
3. The substrate for display according to claim 1 or 2, wherein the third wall has a height greater than that of the first wall.
4. The substrate for display according to claim 3, wherein the height H1 of the first retaining wall is in the range of 0.3um H1 1 um; the range of the height H2 of the second retaining wall is more than or equal to 0.1um and less than or equal to H2 and less than or equal to 0.6 um; the range of the height H3 of the third retaining wall is H3 not less than 1 um.
5. The substrate for display use according to claim 1,
the range of the wall thickness D1 of the first retaining wall is more than or equal to 5um and less than or equal to D1 and less than or equal to 50 um;
the wall degree D2 of the second retaining wall is within the range of 10um and not more than D2 and not more than 100 um.
6. The substrate according to claim 1, wherein the first, second, and third retaining walls have trapezoidal longitudinal cross-sections; the longitudinal section is vertical to the substrate and parallel to the wall thickness direction of the first retaining wall; the upper bottoms of the longitudinal sections of the first retaining wall and the third retaining wall are far away from the substrate, and the lower bottoms are close to the substrate;
the upper bottom of the longitudinal section of the second retaining wall is close to the substrate, and the lower bottom of the longitudinal section of the second retaining wall is far away from the substrate.
7. The substrate according to claim 1, wherein the first, second, and third retaining walls have trapezoidal longitudinal cross sections; the longitudinal section is vertical to the substrate and parallel to the wall thickness direction of the first retaining wall;
the upper bottoms of the longitudinal sections of the second retaining wall and the third retaining wall are far away from the substrate, and the lower bottoms are close to the substrate;
the upper bottom of the longitudinal section of the first retaining wall is close to the substrate, and the lower bottom of the longitudinal section of the first retaining wall is far away from the substrate.
8. The substrate according to claim 7, wherein an angle between a surface of the second retaining wall on a side away from the substrate and a surface of the first retaining wall on a side close to the second retaining wall is in a range of 10 ° to 70 °.
9. A display device comprising the substrate for display according to any one of claims 1 to 8.
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| CN117501845A (en) * | 2022-05-26 | 2024-02-02 | 京东方科技集团股份有限公司 | Display substrate and display device |
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| CN109713007A (en) * | 2017-10-25 | 2019-05-03 | 京东方科技集团股份有限公司 | Array substrate and preparation method thereof, display panel, display device |
| CN110120469A (en) * | 2013-01-17 | 2019-08-13 | 科迪华公司 | High-resolution organic light emitting diode device |
| CN110429100A (en) * | 2018-07-20 | 2019-11-08 | 广东聚华印刷显示技术有限公司 | Display panel and its preparation method and application |
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| CN110120469A (en) * | 2013-01-17 | 2019-08-13 | 科迪华公司 | High-resolution organic light emitting diode device |
| CN106601779A (en) * | 2016-12-29 | 2017-04-26 | 深圳市华星光电技术有限公司 | OLED substrate and manufacturing method thereof |
| CN107731871A (en) * | 2017-09-29 | 2018-02-23 | 上海天马微电子有限公司 | Display panel and preparation method thereof and display device |
| CN109713007A (en) * | 2017-10-25 | 2019-05-03 | 京东方科技集团股份有限公司 | Array substrate and preparation method thereof, display panel, display device |
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