CN108010953B - Organic light-emitting display back plate, preparation method thereof and display device - Google Patents
Organic light-emitting display back plate, preparation method thereof and display device Download PDFInfo
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- 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
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- 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
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- H10K59/121—Active-matrix OLED [AMOLED] displays characterised by the geometry or disposition of pixel elements
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- H—ELECTRICITY
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- 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
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Abstract
The invention discloses an organic light-emitting back plate, a preparation method thereof and a display device. Specifically, the invention provides an organic light-emitting display back plate, which comprises: the display device comprises a substrate, a display area and a packaging area are defined on the substrate, and the packaging area is arranged around the display area; and the virtual pixel layer is positioned in a region outside the display region, and the thickness of the position, close to the display region, in the virtual pixel layer is smaller than the thickness of the position, far away from the display region, in the virtual pixel layer. Thus, the organic light-emitting display back plate has at least one of the following advantages: the number of pixels of the virtual pixel layer is reduced, the film forming uniformity of the display area during ink-jet printing film forming is ensured, and the design requirements of large size and narrow frame are met.
Description
Technical Field
The invention relates to the technical field of display, in particular to an organic light-emitting display back plate, a preparation method thereof and a display device.
Background
Organic electroluminescent (OLED) display technology has become a research hotspot in the field of photoelectric display technology due to its advantages of self-luminescence, wide viewing angle, high contrast, low power consumption, extremely high response speed, ultra-light and thin weight, flexible display, rollable screen, strong temperature adaptability, simple manufacturing process, and the like. As an important one of OLED display technologies, polymer electroluminescent (PLED) display technologies are increasingly widely used. The technology of manufacturing a PLED display device by using inkjet printing (inkjet printing PLED technology) is widely used for manufacturing an organic light emitting display device because of its advantages of simple operation, low cost, simple process, easy realization of a large size, and the like. When an organic light-emitting film obtained by depositing an organic light-emitting material by ink-jet printing is used, because the drying atmosphere of the pixels at the edge of the substrate is different from that of the pixels in the middle of the substrate, solvent vapor is mainly volatilized from the edge area of the liquid drop, and the volume change of the solution is mainly generated in the central area of the liquid drop, so that the solution flow from the center to the edge is formed in the liquid drop, the solute is driven to migrate to the edge of the liquid drop by the flow and is finally deposited on the edge, the deposition appearance with thick edge and thin center is finally formed, the coffee ring effect is generated, and the film. Therefore, when a display device is manufactured by using inkjet printing, in addition to printing a light emitting material on a display region, Dummy pixels, also called Dummy region pixels, are generally printed and disposed on the periphery of the display region by using the same material to ensure uniformity of film formation on the display region.
However, there is still a need for improvement in the current organic light emitting display backplane, the method for manufacturing the same, and the display device.
Disclosure of Invention
The present invention is based on the discovery and recognition by the inventors of the following facts and problems:
the inventor finds that the organic light-emitting display back plate prepared by ink-jet printing generally has the problem of large number of pixels in a virtual pixel layer (also called dummy area): as described above, in the case of manufacturing an organic light emitting display device using inkjet printing, in order to secure film formation uniformity in a display area and uniformity in luminance of a light emitting device, Dummy area pixels are generally disposed around the display area. The Dummy area pixels are not used for emitting light but can be used as the 'edge' portion of the display area pixels, so that the 'edge' with uneven film thickness after drying is positioned in the Dummy area. Therefore, in order to ensure that the "edge" with uneven thickness is located in the Dummy area, more pixels need to be disposed in the Dummy area as a buffer, and it is difficult to narrow the frame of the display substrate. This problem is particularly pronounced when the thickness of the light-emitting layer in the display area is large: for example, when the organic light-emitting film is at the second anti-node, the film thickness is close to or greater than 100nm, the film formation unevenness of the ink-jet printed film is more remarkable, that is, the greater the difference between the film thicknesses at the edge and the middle of the film is, and more pixels in the Dummy area need to be arranged in order to ensure the film formation uniformity of the display area. The Dummy area pixels are ineffective areas for later light emission, which not only causes material waste, but also is not beneficial to the design requirement of a narrow frame. Therefore, if a method can be proposed to reduce the number of pixels in the Dummy area and to ensure the film thickness uniformity in the display area, the above-mentioned problem will be solved to a great extent.
The present invention aims to alleviate or solve at least to some extent at least one of the above mentioned problems.
In one aspect of the invention, an organic light emitting display backplane is presented. According to an embodiment of the present invention, the organic light emitting display back plate includes a display region including: the display device comprises a substrate, a display area and a packaging area are defined on the substrate, and the packaging area is arranged around the display area; and the virtual pixel layer is positioned in a region outside the display region, and the thickness of the position, close to the display region, in the virtual pixel layer is smaller than the thickness of the position, far away from the position, in the virtual pixel layer. Thus, the organic light-emitting display back plate has at least one of the following advantages: the number of pixels of the virtual pixel layer is reduced, the film forming uniformity of the display area during ink-jet printing film forming is ensured, and the design requirements of large size and narrow frame are met.
According to the embodiment of the present invention, a light emitting layer is disposed in the display region, the light emitting layer is disposed adjacent to the dummy pixel layer, and a thickness of the dummy pixel layer adjacent to the light emitting layer is equal to a thickness of the light emitting layer. Therefore, the film thickness uniformity of the display area during ink-jet printing film formation is improved, and the service performance of the light-emitting device is improved.
According to the embodiment of the invention, the thickness of the virtual pixel layer gradually increases along the direction far away from the display area. Therefore, the pixel drying atmosphere of the virtual pixel layer from the position close to the display area to the position far away from the display area is kept consistent, the film thickness unevenness of the virtual pixel layer is reduced, and the number of pixels of the virtual pixel layer is reduced.
According to an embodiment of the present invention, the dummy pixel layer is formed of a material constituting the light emitting layer. Thus, the film thickness uniformity of the light-emitting layer can be improved by providing the dummy pixel layer.
According to the embodiment of the invention, the maximum value of the thickness of the virtual pixel layer is 3-10 times of the minimum value of the thickness of the virtual pixel layer. Thus, the thickness difference range is advantageous for reducing the number of pixels of the pixel layer.
According to an embodiment of the present invention, the virtual pixel layer further includes a plurality of virtual sub-pixel units, each of the virtual sub-pixel units includes a plurality of virtual sub-pixels, the thickness of the plurality of virtual sub-pixels in the same virtual sub-pixel unit is equal, and each of the virtual sub-pixel units includes only one virtual sub-pixel along a direction from the display area to the encapsulation area. Therefore, the solvent drying atmosphere of the pixels of the virtual pixel layer is consistent, the number of the pixels of the virtual pixel layer is reduced, and the film thickness uniformity of the display area is ensured.
According to an embodiment of the present invention, the virtual pixel layer includes: the first virtual sub-pixel unit is arranged around the display area, and the thickness of the virtual sub-pixel in the first virtual sub-pixel unit is 1-3 mu m; a second virtual sub-pixel unit, wherein the second virtual sub-pixel unit is arranged around the first virtual sub-pixel unit, and the thickness of the virtual sub-pixel in the second virtual sub-pixel unit is 3-5 μm; and the third virtual sub-pixel unit is arranged around the second virtual sub-pixel unit, and the thickness of the virtual sub-pixel in the third virtual sub-pixel unit is 5-10 mu m. Therefore, the virtual sub-pixel units of the virtual pixel layer form a proper thickness gradient, the number of pixels of the virtual pixel layer is reduced, and the film forming uniformity of the display area is ensured.
In another aspect of the present invention, a display device is provided. According to an embodiment of the present invention, the display device includes the organic light emitting display backplane described above. Therefore, the display device has all the features and advantages of the organic light emitting display back plate, which are not described herein again.
In yet another aspect of the invention, a method of making an organic light emitting display backplane is provided. According to an embodiment of the invention, the method comprises: providing a substrate, wherein a display area and a packaging area are defined on the substrate, and the packaging area is arranged around the display area; and arranging a virtual pixel layer on the substrate, wherein the virtual pixel layer is positioned in a region outside the display region, and the thickness of the virtual pixel layer close to the display region is smaller than that of the virtual pixel layer far away from the display region. Therefore, the number of pixels of the virtual pixel layer of the prepared organic light-emitting display back plate can be reduced, the film forming uniformity of a display area formed by ink-jet printing can be ensured, and the preparation of the organic light-emitting display back plate with large size and narrow frame is facilitated.
According to an embodiment of the present invention, the dummy pixel layer and the light emitting layer disposed in the display region are formed of the same material by ink jet printing, wherein a thickness of the dummy pixel layer is controlled by controlling an amount of the ink jet printed material. Thus, the thickness of the dummy pixel layer can be controlled by a simple method.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 shows a schematic structural diagram of an organic light emitting display backplane according to an embodiment of the present invention;
FIG. 2 shows a schematic structural diagram of an organic light emitting display backplane according to another embodiment of the present invention;
FIG. 3 shows a schematic structural diagram of a prior art organic light emitting display backplane containing a "Halo region";
FIG. 4 shows a schematic structural diagram of an organic light emitting display backplane according to yet another embodiment of the present invention;
FIG. 5 shows a schematic structural diagram of an organic light emitting display backplane according to yet another embodiment of the present invention;
FIG. 6 shows a schematic structural diagram of an organic light emitting display backplane according to yet another embodiment of the present invention;
FIG. 7 is a schematic structural diagram of a display device according to an embodiment of the present invention; and
fig. 8 shows a flow chart of a method of manufacturing an organic light emitting display backplane according to an embodiment of the present invention.
Description of reference numerals:
100: a substrate; 110: a display area; 120: a packaging region; 200: a virtual pixel layer; 300: a light emitting layer; 10: a first virtual sub-pixel unit; 20: a second virtual sub-pixel unit; 30: a third virtual sub-pixel unit; 1000: an organic light emitting display backplane; 1100: a display device.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In one aspect of the invention, an organic light emitting display backplane is presented. According to an embodiment of the present invention, referring to fig. 1, the organic light emitting display back sheet 1000 includes: a substrate 100 and a dummy pixel layer 200. Specifically, the substrate 100 defines a display area 110 and a package area 120 (e.g., the peripheral portion of the dashed box in fig. 1), and the package area 120 is disposed around the display area 100. According to an embodiment of the present invention, referring to fig. 2 (a cross-sectional view along AA' in fig. 1), the virtual pixel layer 200 is disposed in an area outside the display area 110, and a thickness D2 in the virtual pixel layer 200 near the display area 110 is smaller than a thickness D1 in the virtual pixel layer 200 far from the display area 100. Thus, the organic light emitting display backplane 1000 has at least one of the following advantages: the number of pixels of the virtual pixel layer is reduced, the film forming uniformity of the display area during ink-jet printing film forming is ensured, and the design requirements of large size and narrow frame are met.
For ease of understanding, the following first describes in detail the principle of the virtual pixel layer according to the embodiment of the present invention to achieve the above technical effects:
at present, the virtual pixel layer for ink-jet printing is generally a structure with the same thickness as the light-emitting layer of the display area and uniform thickness. As previously mentioned, the ink jet printed film, after drying, forms a "Halo" region as shown in FIG. 3 at the edge. As shown in fig. 3, the outer side of the Halo region has a higher protrusion (as shown by the side far away from the light emitting layer 300), the inner side of the protrusion (as shown by the side near the light emitting layer 300) forms a recess, and then extends inward to obtain the light emitting layer 300 with uniform height. Therefore, under the premise that the thickness of the dummy pixel layer is uniform and equal to the thickness of the light emitting layer, a sufficiently wide dummy pixel layer is required to serve as a buffer in order to make the protrusion and the recess structure located outside the display region. According to the virtual pixel layer of the embodiment of the invention, the thickness of the virtual pixel layer close to the display area is smaller than that of the virtual pixel layer far away from the display area, that is, the ink-jet thickness of the virtual pixel layer far away from the display area of the virtual pixel layer is larger than that of the virtual pixel layer close to the display area. After drying, the above structure will form a "Halo" region similar to that shown in fig. 3, and since the dummy pixel layer at this time is not of an equal thickness structure, even though the dummy pixel layer at the region corresponding to the recessed structure in fig. 3 dries faster than the inner dummy pixel layer, because the thickness of the dummy pixel layer at this position is greater than that of the inner dummy pixel layer, the recessed structure shown in fig. 3 is not formed after drying, but rather a film layer with a uniform thickness tends to be formed. Therefore, on the premise of ensuring the film forming uniformity of the display area, the number of pixels of the virtual pixel layer is reduced, namely the width of a 'Halo' area is reduced, and the design requirements of large-size and narrow frames are further met.
According to an embodiment of the present invention, referring to fig. 4, a light emitting layer 300 may be disposed in the display region 110, the light emitting layer 300 may be disposed adjacent to the virtual pixel layer 200, and a thickness D2 of the virtual pixel layer 200 adjacent to the light emitting layer 300 may be equal to a thickness D3 of the light emitting layer 300. Therefore, the solvent drying atmosphere of the dummy pixel layer 200 near the light emitting layer 300 can be kept consistent with that of the light emitting layer 300, so that the film forming uniformity of the display area can be ensured, and the service performance of the light emitting device can be further improved. According to an embodiment of the present invention, the dummy pixel layer 200 may be formed of a material constituting the light emitting layer 300. That is, since the dummy pixel layer 200 is made of the same material as that of the pixel layer 300 in the case of performing ink jet printing, the formation uniformity of the light emitting layer 300 can be ensured by simply providing the dummy pixel layer 200.
Since the solvent evaporation speed of the inkjet-printed dummy pixel layer gradually increases in a direction away from the display region 110, the thickness of the dummy pixel layer 200 may gradually increase in a direction away from the display region 110 according to an embodiment of the present invention. Therefore, the solvent drying atmosphere of the virtual pixel layer 200 from the position close to the display area 110 to the position far away from the display area 110 is kept consistent as much as possible, and the uneven film thickness of the virtual pixel layer is reduced, so that the number of pixels of the virtual pixel layer 200 is reduced on the premise of ensuring the film forming uniformity of the display area, and the design of a large-size and narrow frame is facilitated.
According to an embodiment of the present invention, the specific thickness of the virtual pixel layer 200 is not particularly limited as long as the thickness of the virtual pixel layer is increased in a direction away from the display region 110. According to an embodiment of the present invention, the maximum value of the thickness of the dummy pixel layer 200 may be 3 to 10 times the minimum value of the thickness of the dummy pixel layer 200. In the thickness range, the thickness of the virtual pixel layer 200 is gradually increased from the direction close to the display area to the direction far away from the display area, so that the uneven film thickness caused by the accelerated solvent volatilization of the virtual pixel layer 200 along the direction far away from the display area can be well compensated, the solvent drying atmosphere of the virtual pixel layer 200 is kept consistent as much as possible, and the reduction of the number of pixels of the virtual pixel layer 200 is facilitated. When the difference between the maximum value and the minimum value of the thickness of the virtual pixel layer 200 is small (for example, the maximum value of the thickness is less than 3 times of the minimum value), the thickness of the virtual pixel layer 200 does not change significantly in the direction from the position close to the display area to the position far away from the display area, and the non-uniform thickness of the virtual pixel layer film caused by the gradual acceleration of the solvent evaporation in the direction cannot be compensated well, so that the number of pixels of the virtual pixel layer 200 cannot be reduced significantly. When the maximum value and the minimum value of the thickness of the dummy pixel layer 200 are different from each other (for example, the thickness maximum value is greater than 10 times of the minimum value), the thickness of the dummy pixel layer to be printed by ink-jet printing is too large, and ink-jet materials are wasted.
In particular, in the present invention, the thickness of the dummy pixel layer 200 may be increased along the direction from the display region 110 to the panel edge (package region). For example, according to an embodiment of the present invention, referring to fig. 2, the thickness of the dummy pixel layer 200 may be uniformly increased in a direction away from the display area 110; referring to fig. 4, the thickness of the dummy pixel layer 200 near the display region may be equal to the thickness of the light emitting layer 300 in the display region; alternatively, referring to fig. 6, the thickness of the dummy pixel layer 200 may also be increased in a gradient in a direction away from the display area 110.
According to an embodiment of the present invention, referring to fig. 5, the virtual pixel layer may further include a plurality of virtual sub-pixel units (such as the first virtual sub-pixel unit 10, the second virtual sub-pixel unit 20, and the third virtual sub-pixel unit 30 shown in fig. 5), the virtual sub-pixel unit may include a plurality of virtual sub-pixels, the thicknesses of the plurality of virtual sub-pixels located in the same virtual sub-pixel unit may be equal, and each virtual sub-pixel unit includes only one virtual sub-pixel in a direction from the display area to the encapsulation area. Therefore, the virtual pixel layer with the height gradually increasing along the direction from the display area to the display area is arranged around the whole display area. Therefore, the film forming uniformity of the display area can be improved, the total number of pixels of the virtual pixel layer is reduced, raw materials are saved, and narrow-frame design is facilitated.
According to the embodiment of the present invention, the specific number of the dummy sub-pixel units is not particularly limited as long as the height of the dummy pixel layer gradually increases in a direction from the approach to the display area to the distance from the display area. For example, referring to fig. 4 and 5 (fig. 5 is a cross-sectional view along the direction AA' in fig. 4), the number of the dummy sub-pixel units may be set to 3, that is, the dummy pixel layer 200 may include: the display device comprises a first virtual sub-pixel unit 10, a second virtual sub-pixel unit 20 and a third virtual sub-pixel unit 30 which are arranged around a display area in sequence along the direction from the display area to the display area. Specifically, the thickness of the first dummy sub-pixel unit 10 may be equal to the thickness of the light emitting layer 300. According to the embodiment of the invention, the thickness of the dummy sub-pixel in the first dummy sub-pixel unit 10 may be 1 to 3 μm, and the thickness of the light emitting layer 300 may be 1 to 3 μm. The thickness of the dummy sub-pixel in the second dummy sub-pixel unit 20 may be 3 to 5 μm. The thickness of the dummy sub-pixel in the third dummy sub-pixel unit 20 may be 5-10 μm. Therefore, the virtual pixel layer 200 can form a virtual sub-pixel unit with a proper thickness gradient, which is beneficial to keeping the solvent drying atmosphere of the virtual pixel layer 200 from the pixel close to the display area 110 to the pixel in the Dummy area far away from the display area 110 consistent as much as possible, and reducing the uneven film thickness of the virtual pixel layer, thereby being beneficial to reducing the number of pixels of the virtual pixel layer 200 on the premise of ensuring the film forming uniformity of the display area, and being beneficial to the design of large size and narrow frame.
It will be appreciated by those skilled in the art that in order to form the light-emitting layer in the display region, a pixel definition layer (disposed at the gaps between the pixels of the light-emitting layer as shown in fig. 6) is also typically provided to precisely define the location and height of the ink-jet printed material. Similarly, in the virtual pixel layer, the same pixel definition layer is also disposed to define the pixel size of the virtual pixel layer. Since the dummy pixel layer is not used for light emission and display, the precision requirement for ink-jet printing is not so high as long as the dummy pixel layer having the shape described above can be prepared. Therefore, according to the virtual pixel layer of the embodiment of the invention, the amount of the ink-jet printing material can be controlled only by setting the parameters of the ink-jet printing, so that the thickness of the virtual pixel layer can be gradually increased in the direction away from the display area without changing the shape and height of the pixel defining layer of the existing virtual pixel layer.
In another aspect of the present invention, a display device is provided. According to an embodiment of the present invention, referring to fig. 7, the display device 1100 includes the organic light emitting display backplane 1000 described above. Thus, the display device 1100 can have all the features and advantages of the organic light emitting display backplane 1000 described above, and thus, the description thereof is omitted. In general, the display device 1000 has at least one of the following advantages: the number of pixels of the virtual pixel layer is reduced, the film forming uniformity of the display area during ink-jet printing film forming is ensured, and the design requirements of large size and narrow frame are met.
In yet another aspect of the invention, a method of making an organic light emitting display backplane is provided. According to the embodiment of the invention, the organic light-emitting display back plate prepared by the method can be the organic light-emitting display back plate. Therefore, the organic light-emitting display back plate prepared by the method can have all the characteristics and advantages of the organic light-emitting display back plate.
Referring to fig. 8, the method includes, according to an embodiment of the present invention:
s100: providing a substrate
In this step, a substrate is provided that defines a display area and an encapsulation area, the encapsulation area being disposed around the display area. The specific type of substrate is not particularly limited and may be selected by one of ordinary skill in the art according to the actual requirements, according to embodiments of the present invention. For example, according to embodiments of the present invention, the substrate may be glass.
S200: providing a dummy pixel layer on a substrate
In this step, a dummy pixel layer is provided on the substrate. According to the embodiment of the invention, the virtual pixel layer is positioned in the region outside the display region, and the thickness of the virtual pixel layer close to the display region is smaller than that of the virtual pixel layer far away from the display region. That is to say, when the organic light-emitting film is prepared by ink-jet printing, the ink-jet height of the virtual pixel layer far away from the display area is higher than that of the virtual pixel layer close to the display area, therefore, the uneven film thickness caused by the fact that the solvent is volatilized more and more quickly from the direction close to the display area to the direction far away from the display area in the virtual pixel layer can be compensated, so that the drying atmosphere of the solvent in the direction from the direction close to the display area to the direction far away from the display area of the virtual pixel layer is more consistent, the pixel number of the virtual pixel layer is reduced, the film forming uniformity of the display area can be ensured, and the design requirements of large size and.
According to the embodiment of the present invention, the dummy pixel layer and the light emitting layer provided in the display region may be formed of the same material by inkjet printing, and thus, the film thickness uniformity of the display region may be easily improved by providing the dummy pixel layer. According to an embodiment of the present invention, the thickness of the dummy pixel layer can be controlled by controlling the amount of material for ink-jet printing. It can be understood by those skilled in the art that since the dummy pixel layer is not used for light emission and display, the precision requirement for ink-jet printing is not so high as long as the dummy pixel layer having the shape described above can be prepared. Therefore, in the preparation of the virtual pixel layer according to the embodiment of the present invention, the thickness of the virtual pixel layer can be gradually increased in a direction away from the display region by controlling the amount of the inkjet printing material only by setting the parameters of inkjet printing without changing the shape and height of the pixel defining layer of the virtual pixel layer. Therefore, the method simplifies the production process, can simply and conveniently reduce the number of pixels of the virtual pixel layer, can ensure the film forming uniformity of the display area, and is favorable for the design requirements of large-size and narrow frames.
In the description of the present invention, the terms "upper", "lower", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention but do not require that the present invention must be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description herein, references to the description of "one embodiment," "another embodiment," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction. In addition, it should be noted that the terms "first" and "second" in this specification are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (9)
1. An organic light emitting display backplane, comprising:
the display device comprises a substrate, a display area and a packaging area are defined on the substrate, and the packaging area is arranged around the display area; and
the display device comprises a virtual pixel layer, wherein the virtual pixel layer is positioned in a region outside the display region, the thickness of the position, close to the display region, in the virtual pixel layer is smaller than the thickness of the position, far away from the display region, in the virtual pixel layer, a light emitting layer is arranged in the display region, the light emitting layer is adjacent to the virtual pixel layer, and the thickness of the virtual pixel layer adjacent to the light emitting layer is equal to that of the light emitting layer.
2. The organic light-emitting display backplane according to claim 1, wherein the thickness of the dummy pixel layer gradually increases in a direction away from the display area.
3. The organic light emitting display backplane of claim 1, the dummy pixel layer being formed of a material comprising the light emitting layer.
4. The organic light-emitting display backplane according to claim 1, wherein a maximum value of the thickness of the dummy pixel layer is 3 to 10 times a minimum value of the thickness of the dummy pixel layer.
5. The organic light-emitting display backplane according to claim 2, wherein the virtual pixel layer further comprises a plurality of virtual sub-pixel units, each of the virtual sub-pixel units comprises a plurality of virtual sub-pixels, the thickness of the plurality of virtual sub-pixels in the same virtual sub-pixel unit is equal, and each of the plurality of virtual sub-pixel units comprises only one of the virtual sub-pixels in a direction from the display area to the encapsulation area.
6. The organic light emitting display backplane according to claim 5, wherein the dummy pixel layer comprises:
the first virtual sub-pixel unit is arranged around the display area, and the thickness of the virtual sub-pixel in the first virtual sub-pixel unit is 1-3 mu m;
a second virtual sub-pixel unit, wherein the second virtual sub-pixel unit is arranged around the first virtual sub-pixel unit, and the thickness of the virtual sub-pixel in the second virtual sub-pixel unit is 3-5 μm;
and the third virtual sub-pixel unit is arranged around the second virtual sub-pixel unit, and the thickness of the virtual sub-pixel in the third virtual sub-pixel unit is 5-10 mu m.
7. A display device comprising the organic light emitting display backplane according to any one of claims 1 to 6.
8. A method of making an organic light emitting display backplane, comprising:
providing a substrate, wherein a display area and a packaging area are defined on the substrate, and the packaging area is arranged around the display area; and
disposing a virtual pixel layer on the substrate, the virtual pixel layer being located in a region outside the display region, and a thickness of the virtual pixel layer near the display region being smaller than a thickness of the virtual pixel layer far from the display region,
the display area is provided with a luminous layer, the luminous layer is arranged adjacent to the virtual pixel layer, and the thickness of the virtual pixel layer adjacent to the luminous layer is equal to that of the luminous layer.
9. The method according to claim 8, wherein the dummy pixel layer and the light emitting layer provided in the display region are formed of the same material by ink-jet printing,
wherein the thickness of the dummy pixel layer is controlled by controlling the amount of the ink-jet printed material.
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| CN110416428B (en) * | 2019-07-22 | 2021-12-28 | Tcl华星光电技术有限公司 | Display panel manufacturing method and display panel |
| CN111477660B (en) * | 2020-04-16 | 2023-12-26 | 合肥京东方卓印科技有限公司 | Display substrate and display device |
| EP4152399A4 (en) * | 2020-05-11 | 2023-06-28 | BOE Technology Group Co., Ltd. | Display panel, mask, mask assembly, and method for manufacturing mask assembly |
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| CN103149739B (en) * | 2013-03-05 | 2015-09-02 | 合肥京东方光电科技有限公司 | Alignment films preparation method and system |
| CN104260554B (en) * | 2014-09-24 | 2016-03-30 | 京东方科技集团股份有限公司 | The preparation method of inkjet printing methods and equipment, display base plate |
| KR102457536B1 (en) * | 2015-06-30 | 2022-10-21 | 엘지디스플레이 주식회사 | Organic light emitting display device |
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