WO2019062580A1 - 显示基板及其制备方法、喷墨打印方法、显示装置 - Google Patents

显示基板及其制备方法、喷墨打印方法、显示装置 Download PDF

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Publication number
WO2019062580A1
WO2019062580A1 PCT/CN2018/106006 CN2018106006W WO2019062580A1 WO 2019062580 A1 WO2019062580 A1 WO 2019062580A1 CN 2018106006 W CN2018106006 W CN 2018106006W WO 2019062580 A1 WO2019062580 A1 WO 2019062580A1
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Prior art keywords
pixel defining
area
display
layer
unit
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PCT/CN2018/106006
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English (en)
French (fr)
Inventor
侯文军
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京东方科技集团股份有限公司
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Application filed by 京东方科技集团股份有限公司 filed Critical 京东方科技集团股份有限公司
Priority to US16/335,097 priority Critical patent/US11522026B2/en
Priority to EP18857407.3A priority patent/EP3690947A4/en
Publication of WO2019062580A1 publication Critical patent/WO2019062580A1/zh

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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
    • 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
    • H10K59/80—Constructional details
    • H10K59/88—Dummy elements, i.e. elements having non-functional features
    • 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
    • H10K59/17—Passive-matrix OLED displays
    • H10K59/173—Passive-matrix OLED displays comprising banks or shadow masks
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
    • H10K71/10—Deposition of organic active material
    • H10K71/12—Deposition of organic active material using liquid deposition, e.g. spin coating
    • H10K71/13—Deposition of organic active material using liquid deposition, e.g. spin coating using printing techniques, e.g. ink-jet printing or screen printing
    • H10K71/135—Deposition of organic active material using liquid deposition, e.g. spin coating using printing techniques, e.g. ink-jet printing or screen printing using ink-jet printing

Definitions

  • Embodiments of the present disclosure relate to a display substrate, a method of fabricating the same, an inkjet printing method, and a display device.
  • the organic light-emitting display device has the advantages of self-luminescence, fast response, wide viewing angle, high brightness, colorful color, thinness and the like, and thus becomes an important display technology.
  • the organic functional layer of the organic light-emitting display device can be formed, for example, by inkjet printing, and the formation of the organic functional layer by the inkjet printing method requires that a pixel defining layer be formed on the substrate substrate in advance to define an accurate injection designation of the organic functional material. Within the pixel area.
  • At least one embodiment of the present disclosure provides a display substrate having a display area and a peripheral area, including a pixel defining layer; the pixel defining layer includes: a display pixel defining area and an auxiliary pixel defining area surrounding the display pixel defining area;
  • the display pixel defining region includes a plurality of first pixel defining units;
  • the auxiliary pixel defining region includes a plurality of second pixel defining units, and an opening area of at least a portion of the second pixel defining unit is greater than the first pixel Defining an open area of the unit; the display pixel defining area is in the display area, the auxiliary pixel defining area is in the peripheral area, the plurality of first pixel defining units are configured to form display pixels,
  • the second pixel defining units are configured to form auxiliary pixels.
  • the plurality of second pixel defining units are arranged layer by layer around the display pixel defining area, and are adjacent to the display pixel defining area, the auxiliary pixel
  • the opening area of the second pixel defining unit in the defined area gradually increases from the inner layer to the outer layer.
  • an opening area of the plurality of first pixel defining units is the same size, and an opening area of the second pixel defining unit at the innermost layer is equal to the first The pixel defines the open area of the unit.
  • an opening area of the plurality of first pixel defining units is different in size, and an opening area of the second pixel defining unit located in an innermost layer is equal to an adjacent one thereof.
  • the first pixel defines an open area of the unit.
  • the auxiliary pixel defining region includes 3-6 layers of the second pixel defining unit.
  • the opening of the second pixel defining unit located in the same layer is the same as the opening shape of the first pixel defining unit adjacent thereto, and the size is enlarged by the same scale. .
  • the first pixel defining unit and the second pixel defining unit are arranged in a matrix form.
  • At least one embodiment of the present disclosure provides a method of performing inkjet printing using a pixel defining layer in any one of the above-described display substrates, comprising: opening at the first pixel defining unit and the second pixel defining unit Inkjet printing is performed inside.
  • the ink amount of inkjet printing in the opening of the second pixel defining unit is not less than the inkjet in the opening of the first pixel defining unit.
  • ink amounts of inkjet printing in the second pixel defining unit and the first pixel defining unit are respectively associated with the second pixel defining unit and The size of the opening area of the first pixel defining unit is proportional.
  • At least one embodiment of the present disclosure provides a method of fabricating a display substrate, the display substrate including a display region and a peripheral region, the method comprising: forming a pixel defining layer, the pixel defining layer comprising: a display pixel defining region and surrounding the An auxiliary pixel defining region displaying a pixel defining region; wherein the display pixel defining region includes a plurality of first pixel defining units; the auxiliary pixel defining region includes a plurality of second pixel defining units, and at least a portion of the second pixels
  • the opening area of the defining unit is larger than the opening area of the first pixel defining unit; the display pixel defining area is formed in the display area, the auxiliary pixel defining area is formed in the peripheral area;
  • the first pixel defining unit forms a plurality of first pixels in the display area, and forms a plurality of second pixels in the peripheral area by the plurality of second pixel defining units.
  • forming the plurality of first pixels and the plurality of second pixels includes: defining, at the first pixel defining unit and the second pixel An organic material is inkjet printed within the opening of the unit to form an organic functional layer.
  • an amount of organic material ink-jet-printed in an opening of the second pixel defining unit and the first pixel defining unit is respectively different from the second
  • the pixel defining unit is proportional to the size of the opening area of the first pixel defining unit.
  • the organic functional layer includes one or more of a light-emitting layer, an electron injection layer, a hole injection layer, an electron transport layer, and a hole transport layer. .
  • At least one embodiment of the present disclosure provides a display device including the display substrate of any of the above.
  • FIG. 1 is a schematic plan view of a pixel defining layer of a display substrate according to an embodiment of the present disclosure
  • FIG. 2 is a schematic plan view 2 of a pixel defining layer of a display substrate according to an embodiment of the present disclosure
  • FIG. 3 is a schematic plan view 3 of a pixel defining layer of a display substrate according to an embodiment of the present disclosure
  • FIG. 4 is a schematic cross-sectional view of a display substrate according to an embodiment of the present disclosure.
  • FIG. 5A and FIG. 5B are cross-sectional views showing a display substrate in a preparation process according to an embodiment of the present disclosure
  • FIG. 6 is a schematic diagram of a display panel according to an embodiment of the present disclosure.
  • FIG. 7 is a schematic diagram of a display device according to an embodiment of the present disclosure.
  • the pixel defining layer of the display substrate has a plurality of openings.
  • inkjet printing is performed in these openings by inkjet printing
  • ink drying at the edge of the substrate at the edge of the substrate tends to dry faster
  • inkjet printing is performed.
  • the drying speed of the ink inside the substrate tends to be slow, resulting in inconsistent drying speed of the inkjet printed ink at the edge of the substrate and in the opening inside the substrate, which will cause the ink of the inkjet printing to be dried after drying in different positions.
  • the shape is uneven.
  • an organic functional layer form for example, thickness
  • an organic functional layer form for example, thickness
  • an auxiliary pixel may be disposed in the pixel defining layer around the display pixel, and the ink printed in the auxiliary pixel is the same as the display pixel, but The auxiliary pixel does not emit light when the display substrate is displayed.
  • At least one embodiment of the present disclosure provides a display substrate having a display area and a peripheral area, and including a pixel defining layer, the pixel defining layer comprising: a display pixel defining area and an auxiliary pixel defining area surrounding the display pixel defining area
  • the display pixel defining region includes a plurality of first pixel defining units
  • the auxiliary pixel defining region includes a plurality of second pixel defining units, and an opening area of the second pixel defining unit is larger than an opening area of the first pixel defining unit
  • the defined area is within the display area
  • the auxiliary pixel defining area is within the peripheral area
  • the plurality of first pixel defining units are configured to form display pixels
  • the plurality of second pixel defining units are configured to form auxiliary pixels.
  • At least one embodiment of the present disclosure provides a method of inkjet printing using a pixel defining layer of the above display substrate, the method comprising: performing inkjet printing in an opening of a first pixel defining unit and a second pixel defining unit.
  • At least one embodiment of the present disclosure provides a method of fabricating a display substrate, the display substrate including a display area and a peripheral area, the method comprising: forming a pixel defining layer, the pixel defining layer comprising: a display pixel defining area and a surrounding area defined by the display pixel The auxiliary pixel defining region; wherein the display pixel defining region comprises a plurality of first pixel defining units; the auxiliary pixel defining region comprises a plurality of second pixel defining units, and an opening area of at least a portion of the second pixel defining unit is greater than the first pixel defining region An opening area of the unit; a display pixel defining area is formed in the display area, and an auxiliary pixel defining area is formed in the peripheral area; forming a plurality of first pixels in the display area by the plurality of first pixel defining units, and defining by the plurality of second pixels The unit forms a plurality of second pixels in the peripheral area.
  • At least one embodiment of the present disclosure provides a display device including the above display substrate.
  • the pixel defining layer in the display substrate provided by at least one embodiment of the present disclosure can achieve at least balance the drying speed of the ink in the opening of each of the first pixel defining unit by setting a smaller number of second pixel defining units, thereby enabling The shape of the ink in the first pixel defining unit is more uniform after drying; in addition, the second pixel defining unit provided less can reduce the size of the space occupied by the auxiliary pixel defining area, thereby facilitating the narrow frame design of the display substrate, and also The manufacturing process can be simplified, thereby saving costs.
  • the display substrate of the present disclosure a method of manufacturing the same, an inkjet printing method, and a display device will be described below by way of several specific embodiments.
  • At least one embodiment of the present disclosure provides a display substrate, which may be, for example, an array substrate of an organic light emitting diode (OLED) display panel; the display substrate includes a pixel defining layer.
  • the pixel defining layer includes a display pixel defining area 10 and an auxiliary pixel defining area 20 surrounding the display pixel defining area 10; the display pixel defining area 10 includes a plurality of first pixel defining units 101; and an auxiliary pixel defining area 20
  • a plurality of second pixel defining units 201 are included, and an opening area of at least a portion of the second pixel defining units 201 is larger than an opening area of the first pixel defining unit 101.
  • FIG. 4 is a schematic cross-sectional view of the display substrate provided by the embodiment.
  • the display substrate has a display area 1 and a peripheral area 2, and the display pixel defining area 10 is in the display area 1.
  • the region 20 is in the peripheral region 2, (the pixel defining layer shown in the figure is a cross-sectional view of the pixel defining layer along line AA in FIG. 1, the cross-sectional view in the direction perpendicular to the line AA is similar thereto, the present disclosure is no longer provided), and
  • the plurality of first pixel defining units 101 are configured to form display pixels
  • the plurality of second pixel defining units 201 are configured to form auxiliary pixels.
  • the first pixel defining unit and the second pixel defining unit may be arranged, for example, in a matrix form, for example, a plurality of pixel defining units are formed in rows and columns and arranged in alignment with each other.
  • the plurality of second pixel defining units 201 may be arranged layer by layer around the display pixel defining region 10, and the display pixel defining region 10 is inside, and the opening area of the second pixel defining unit 201 is gradually increased from the inner layer to the outer layer.
  • the plurality of second pixel defining units 201 sequentially form an L1 layer, an L2 layer, ..., an L2 layer, and the like, and from the L1 to the LN layer, the second pixel defining unit 201 The opening area is gradually increased.
  • the plurality of second pixel defining units 201 may form, for example, 3-6 layers, for example 4 layers or 5 layers, around the display pixel defining region 10.
  • the pixel since the aperture area of the second pixel defining unit 201 from the L1 to the LN layer is gradually increased in the auxiliary pixel defining region 20, in the process of performing inkjet printing using the pixel defining layer, the pixel may be used according to the pixel. Defining an opening area of the unit to select an amount of ink in which inkjet printing is performed, for example, an ink amount of inkjet printing in the second pixel defining unit and the first pixel defining unit may be respectively associated with the second pixel defining unit and the first pixel defining unit The size of the opening area is proportional.
  • the vapor pressure generated by the inkjet printing ink in the auxiliary pixel defining region can be gradually changed from the outer layer to the inner layer in the auxiliary pixel defining region without abrupt change, thereby achieving balanced inkjet printing.
  • the technical effect of the drying speed of the ink in the pixel defining region 10 is displayed.
  • the size of the opening areas of the plurality of first pixel defining units 101 located in the display pixel defining area 10 may be the same, for example, and in the auxiliary pixel defining area 20, at the innermost layer. That is, the opening area of the second pixel defining unit 201 of the L1 layer may be equal to, for example, the opening area of the first pixel defining unit 101.
  • the size of the opening area of the plurality of first pixel defining units 201 located in the display pixel defining area 10 may be different, for example, for displaying red sub-pixels and displaying green.
  • the opening area of the sub-pixel may be smaller than the opening area of the sub-pixel displaying blue; and, in the auxiliary pixel defining area 20, the opening area of the second pixel defining unit 201 located in the same layer may be different, for example.
  • the opening area of the second pixel defining unit 201 located at the innermost layer, that is, the L1 layer, for example may be equal to the opening area of the first pixel defining unit 101 adjacent thereto.
  • the ink is defined by using the pixel defining layer.
  • the ink amount of the inkjet printing in the second pixel defining unit may be equal to the ink amount of the inkjet printing in the first pixel defining unit adjacent thereto, so that the boundary between the auxiliary pixel defining area and the display pixel defining area may be reduced.
  • the first pixel defines the ink drying speed in the unit.
  • the second layer located in the same layer may be the same, for example.
  • the opening area of the second pixel defining unit 201 located at the innermost layer, that is, the L1 layer is equal to the opening area of the first pixel defining unit 101 having the largest area in the display pixel defining area.
  • the opening of the second pixel defining unit 201 located in the same layer has the same shape and the same size as the opening of the first pixel defining unit 101 adjacent thereto. Zoom in on the same scale.
  • the opening area sizes of the plurality of first pixel defining units 101 located in the display pixel defining area 10 are the same, and in the auxiliary pixel defining area 20, the second pixels located in the same layer are defined
  • the opening area of the unit 201 is the same, and the ratio of the opening area of the second pixel defining unit 201 to the opening area of the first pixel defining unit 101 is sequentially increased from the inner layer to the outer layer, and the increased amplitude is, for example, the same.
  • the aperture ratio of the first pixel defining unit 101 is [the aperture ratio is the ratio of the aperture area of the pixel defining unit to the area occupied by the entire pixel defining unit (the portion circled by the dotted line in the figure), in this embodiment,
  • the opening of the second pixel defining unit 201 located at the L1 layer The rate may be, for example, 30%
  • the aperture ratio of the second pixel defining unit 201 located in the L2 layer may be, for example, 40%
  • the aperture ratio of the second pixel defining unit 201 located in the L3 layer may be, for example, 50%...
  • the opening area of the two-pixel defining unit 201 may be, for example, 70%, that is, the aperture ratio of the second pixel defining unit 201 is sequentially increased by 10% from the inner layer to the outer layer.
  • the aperture ratio of the second pixel defining unit 201 located at the L1 layer may be, for example, 50. %
  • the aperture ratio of the second pixel defining unit 201 located in the L2 layer may be, for example, 60%
  • the aperture ratio of the second pixel defining unit 201 located in the L3 layer may be, for example, 70%, that is, the aperture ratio of the second pixel defining unit 201 Increase from the inner layer to the outer layer by 10%.
  • the number of layers of the second pixel defining unit in the auxiliary pixel defining area is small, and can be adjusted according to requirements.
  • the opening area sizes of the plurality of first pixel defining units 101 located in the display pixel defining area 10 are different, and in the auxiliary pixel defining area 20, the second pixel defining unit located in the same layer
  • the size of the opening area of the 201 is also different, and the size of the opening area of the second pixel defining unit 201 of the same layer is the same as the nearest pixel defining unit 101 of the outermost side of the display pixel defining area 10
  • the ratio of the size of the opening areas is the same, and the ratio is sequentially increased from the inner layer to the outer layer, and the magnitude of the increase may be, for example, the same.
  • the aperture ratio of the second pixel defining unit 201 nearest to the first pixel defining unit 101 having the above-described three openings having different sizes may be, for example, 30%, 35%, and 40%, respectively;
  • the aperture ratios of the corresponding second pixel defining units 201 may be, for example, 35%, 40%, and 45%, respectively;
  • the aperture ratios of the corresponding second pixel defining units 201 may be, for example, 40%, 45%, and 50%
  • the aperture ratio of the corresponding second pixel defining unit 201 may be, for example, 45%, 50%, and 60%, respectively, that is, the aperture ratio of the second pixel defining unit 201 increases from the inner layer to the outer layer.
  • the size of the opening area of the second pixel defining unit 201 located in the same layer may also be the same, for example, the second
  • the size of the opening area of the pixel defining unit 201 is compared with the opening area of the first pixel defining unit 101 having the largest opening, and the size of the opening area of the second pixel defining unit 201 from the inner layer to the outer layer is the largest first pixel defining unit.
  • the ratio of the size of the opening areas of 101 is sequentially increased, and the magnitude of the increase may be, for example, the same.
  • the specific manner of the increase is substantially the same as the case shown in FIG. 1, and details are not described herein again.
  • the size of the opening area of the second pixel defining unit 201 and the opening area of the first pixel defining unit 101 adjacent thereto are from the inner layer to the outer layer.
  • the magnitude of the increase in the ratio of the sizes may be selected according to, for example, the properties of the ink jet printing material, and the magnitude of the increase may be the same or different, and these material properties include solvent evaporation or volatilization rate and the like.
  • the first pixel defining unit 101 and the second pixel defining unit 201 may be, for example, rectangular, and when the second pixel defining unit 201 is increased relative to the first pixel defining unit 101, the long side and the short side thereof are opposite to each other.
  • the long side and the short side of the first pixel defining unit 101 may be, for example, scaled up, that is, the shapes of the first pixel defining unit 101 and the second pixel defining unit 201 are kept the same.
  • the first pixel defining unit 101 and the second pixel defining unit 201 may also be other suitable shapes, such as a parallelogram, a trapezoid, etc., which is not limited in this embodiment.
  • the organic functional layer of the display substrate can be formed, for example, by ink-jet printing an organic material in the openings of the first pixel defining unit and the second pixel defining unit of the pixel defining layer.
  • the pixel defining layer can make the shape of the organic functional layer formed by inkjet printing more uniform, for example, making the thickness and surface topography of the organic functional layer more uniform.
  • the organic functional layer may be, for example, an organic light-emitting layer, an electron injection layer, a hole injection layer, an electron transport layer, a hole transport layer, and the like.
  • the display substrate may further include other functional structures such as a pixel driving circuit, an anode layer, a cathode layer, and an insulating layer, which are not described in this embodiment.
  • the pixel defining layer in the display substrate provided in this embodiment has a display pixel defining area and an auxiliary pixel defining area surrounding the display pixel defining area, and the auxiliary pixel defining area can reduce the ink in the first pixel defining unit located at the edge of the display pixel defining area
  • the drying speed further makes the ink drying speed of the inkjet printing in the opening of each pixel defining unit in the display pixel defining area substantially the same, thereby making the ink more uniform after drying, for example, the film thickness of the ink is more uniform. Therefore, the organic functional layer of the display substrate provided by the embodiment is more uniform in shape, so that the display uniformity of the display substrate can be improved, so that the display substrate has a better display effect.
  • the opening area of the second pixel defining unit at least partially located in the auxiliary pixel defining area is larger than the opening area of the first pixel defining unit located in the defining area of the display pixel, and thus the second pixel defining unit and the first pixel defining unit
  • the opening area of the pixel defining unit may be selected according to The amount of ink that is inkjet printed, for example, ink that is more inkjet printed in the second pixel defining unit, inkjet printing less ink in the first pixel defining unit.
  • the pixel defining layer provided by the embodiment can achieve at least balance the drying speed of the ink in the opening of each of the first pixel defining unit by setting less number of second pixel defining units (for example, 3 layers), thereby making the first
  • the shape of the ink in the pixel defining unit after drying is more uniform (if the opening area of the second pixel defining unit of the auxiliary pixel defining area is the same as the opening area of the first pixel defining unit of the display pixel defining area, especially in the pixel opening)
  • the thickness of the functional layer is thick, it is necessary to provide a second pixel defining unit of 10 or more layers in order to achieve the effect of balancing the drying speed of the ink in the opening of each of the first pixels defining the unit opening);
  • the second pixel defining unit can reduce the size of the space occupied by the auxiliary pixel defining area, thereby facilitating the narrow bezel design of the display substrate, and setting the second second pixel defining unit can also simplify the preparation process, thereby saving
  • At least one embodiment of the present disclosure provides a method for inkjet printing using a pixel defining layer in a display substrate provided by the above embodiments, the method may be used to form an array substrate such as an OLED display panel, the method comprising: at the first Inkjet printing is performed within the openings of the pixel defining unit and the second pixel defining unit, thereby forming the desired functional layer.
  • the amount of ink that is inkjet printed in the opening of the second pixel defining unit may be more than the amount of ink that is inkjet printed at the opening of the first pixel defining unit.
  • the amount of ink that is inkjet printed in the second pixel defining unit and the first pixel defining unit may be proportional to the size of the opening area of the second pixel defining unit and the first pixel defining unit, respectively. Therefore, by inkjet printing different amounts of ink in a prime defining unit having different opening areas in different positions, the ink is dried from the outer layer of the auxiliary pixel defining region to the inner layer, and the upper portion thereof is generated by evaporation of the ink.
  • the difference in vapor pressure is gradually reduced without abrupt changes such that the vapor pressure above each of the first pixel defining units in the display pixel defining region is close to or the same, so that the drying speed of the ink in each of the first pixel defining units is the same Further, the form of the ink after drying is uniform.
  • the second pixel defining The amount of ink that is inkjet printed in the unit is equal to the amount of ink that is inkjet printed in the first pixel defining unit adjacent thereto, which can reduce the sudden change in the vapor pressure generated at the boundary between the auxiliary pixel defining area and the display pixel defining area, thereby preventing the boundary due to the boundary.
  • the ink drying speed in the first pixel defining unit at the edge of the display pixel defining region caused by the difference in vapor pressure at the portion is different from the ink drying speed in the first pixel defining unit located in the layer defining the pixel region.
  • the amount of ink that is ink-jet-printed in the opening of the second pixel defining unit may be sequentially increased, for example, from the inner layer to the outer layer, and the magnitude of the increase may be the same, for example.
  • the shapes of the first pixel defining unit and the second pixel defining unit may be kept the same , that is, the long side and the short side of the second pixel defining unit located in the same layer are increased in the same proportion with respect to the long side and the short side of the first pixel defining unit, and in the auxiliary pixel defining area, from the inner layer to the outer layer
  • the magnitude of the increase is the same; at this time, when the first pixel defining unit and the second pixel defining unit having the same shape and different sizes are located at different positions for inkjet printing, each pixel defining unit has the same shape and is in the
  • the amount of ink in the inkjet printing in the defined area from the inner layer to the outer pixel defining unit is increased by the same amount, thereby thereby better adjusting the size of the vapor pressure generated by the evaporation of the ink above each pixel defining unit, so that the vapor pressure is
  • the variation is more uniform, thereby better achieving a vapor pressure close to or the same above at least the first pixel defining unit in the display pixel defining region, Further, the speed at which the inks in each of the first pixel defining units are dried is substantially the same, so that the form after the ink is dried is more uniform.
  • the inkjet printing method provided by the embodiment can select the amount of ink to be ink-jet-printed according to the position of each pixel defining unit and its opening area, etc., so that the drying of the ink in the second pixel defining unit located at the edge can be adjusted to different degrees.
  • the speed is such that the drying speed of the ink is substantially the same at least in the first pixel defining unit located in the defined area of the display pixel, thereby making the ink more uniform after drying.
  • At least one embodiment of the present disclosure provides a method of fabricating a display substrate.
  • the display substrate includes a display region 1 and a peripheral region 2.
  • the method includes: forming a pixel defining layer (the pixel defining layer shown in the figure) A cross-sectional view of the pixel defining layer along line AA in FIG. 1).
  • the pixel defining layer includes: a display pixel defining area and an auxiliary pixel defining area surrounding the display pixel defining area; the display pixel defining area includes a plurality of first pixel defining units 101; and the auxiliary pixel defining area includes a plurality of second pixel defining units 201, And an opening area of at least a portion of the second pixel defining unit 201 is larger than an opening area of the first pixel defining unit 101.
  • a display pixel defining area and an auxiliary pixel defining area of the pixel defining layer are respectively formed in the display area 1 and the peripheral area 2 of the display substrate; and a plurality of first pixels are formed in the display area 1 by the plurality of first pixel defining units 101, A plurality of second pixels are formed in the peripheral area by the plurality of second pixel defining units 201.
  • the first pixel formed in the display area 1 is a display pixel for displaying a picture to be displayed on the organic light emitting display substrate, for example, a pixel displaying red, green, blue or white; in the peripheral area 2
  • the second pixel formed in the auxiliary pixel is used to assist the formation of the display pixel to make the shape of each functional layer formed in the display pixel more uniform.
  • forming the plurality of first pixels and the plurality of second pixels may include, for example, ink-jet printing organic materials in the openings of the first pixel defining unit 101 and the second pixel defining unit 201 to form Organic functional layer 301.
  • the organic functional layer 301 may be, for example, one or more of an organic light-emitting layer, an electron injection layer, a hole injection layer, an electron transport layer, and a hole transport layer, which is not limited in this embodiment.
  • the size of the opening area of the plurality of first pixel defining units 101 formed on the display region 10 can be the same, for example, The pixel shown in Figure 1 defines a layer.
  • the display substrate can be fully colored by the white light-emitting layer and the color filter.
  • the light-emitting layer of the formed light-emitting display substrate is a light-emitting layer that can emit colored light, for example, a color light-emitting layer that emits red light, green light, and blue light
  • the size of the opening area of the plurality of first pixel defining units 101 may be different, for example, forming a pixel defining layer as shown in FIG. 2 or FIG.
  • the first pixel defining unit 101 may include, for example, a pixel defining unit having three different size openings, and the pixel defining unit may correspond to a blue pixel defining unit, a green pixel defining unit, and a red pixel, for example, from large to small.
  • the unit is defined, so that the organic material of the corresponding color can be ink-jet printed in the above-described pixel defining unit to form a blue light-emitting layer, a green light-emitting layer and a red light-emitting layer, respectively.
  • the light emitting layer of the organic light emitting display substrate can directly emit colored light after being energized.
  • the amount of organic material ink-jet-printed in the openings of the second pixel defining unit and the first pixel defining unit may be selected according to the opening areas of the second pixel defining unit and the first pixel defining unit.
  • the size is proportional, so from the outer layer to the inner layer, the amount of organic material in the second pixel defining unit is gradually reduced by inkjet printing. This can reduce the drying speed of the organic material in the second pixel defining unit located at the edge to a different extent, so that the drying speed of the organic material in the inkjet printing in each pixel defining unit opening is substantially the same.
  • the organic material that is inkjet printed in each of the pixel defining unit openings to be more uniform in shape after drying or at least in the first pixel defining unit, the organic material that is inkjet printed is more uniform after drying.
  • a more uniform organic functional layer is formed in the first pixel defining unit, such as a more uniform organic functional layer such as thickness and surface topography. Therefore, the organic light-emitting display substrate prepared by the method provided by the embodiment has better display uniformity, and the display device thus obtained has a better display effect.
  • the opening area of the second pixel defining unit formed in the peripheral area is larger than the opening area of the first pixel defining unit formed in the display area, forming at least a second second pixel defining unit can achieve at least The technical effect of inkjet printing on the drying speed of the organic material in the opening of each of the first pixels defining the cell is balanced.
  • the number of the second pixels in the peripheral region formed by the method for preparing the organic light-emitting display substrate provided by the embodiment may be less, thereby facilitating the reduction of the peripheral region of the formed display substrate, and realizing the narrow bezel design of the display substrate.
  • the display panel 4 includes the display substrate 3 described above.
  • the display panel 4 may be, for example, an organic light emitting display panel or the like.
  • the display panel 4 has excellent display uniformity, and the display panel 4 has a narrow frame, so that a large-screen display can be realized.
  • the display device 5 includes the above display panel 4.
  • the display device 5 can be any electronic product having a display function, such as a mobile phone, a computer, a television, an e-book, etc., which is not limited in this embodiment.

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Abstract

显示基板及其制备方法、喷墨打印方法、显示装置。该显示基板具有显示区域(1)和周边区域(2)，并包括像素界定层；该像素界定层包括显示像素界定区(10)和围绕显示像素界定区(10)的辅助像素界定区(20)；显示像素界定区(20)包括多个第一像素界定单元(101)；辅助像素界定区(20)包括多个第二像素界定单元(201)，并且至少部分第二像素界定单元(201)的开口面积大于第一像素界定单元(101)的开口面积；显示像素界定区(10)在显示区域(1)内，辅助像素界定区(20)在周边区域(2)内，多个第一像素界定单元(101)配置为形成显示像素，多个第二像素界定单元(201)配置为形成辅助像素。该像素界定层通过设置较少的第二像素界定单元即可实现在进行喷墨打印时平衡位于边缘和位于内部的开口中喷墨打印的墨水的干燥速度，从而使干燥后的墨水形态更加均匀。

Description

显示基板及其制备方法、喷墨打印方法、显示装置
本申请要求于2017年9月28日递交的中国专利申请第201710898569.8号的优先权，在此全文引用上述中国专利申请公开的内容以作为本申请的一部分。
技术领域
本公开的实施例涉及一种显示基板及其制备方法、喷墨打印方法、显示装置。
背景技术
有机发光显示装置具有自发光、反应快、视角广、亮度高、色彩艳、轻薄等优点，因此成为一种重要的显示技术。
有机发光显示装置的有机功能层例如可以采用喷墨打印的方式形成，而利用喷墨打印法形成有机功能层需要预先在衬底基板上制作像素界定层，以限定有机功能材料精确的喷入指定的像素区域内。
发明内容
本公开至少一实施例提供一种显示基板，具有显示区域和周边区域，包括像素界定层；所述像素界定层包括：显示像素界定区和围绕所述显示像素界定区的辅助像素界定区；其中，所述显示像素界定区包括多个第一像素界定单元；所述辅助像素界定区包括多个第二像素界定单元，并且至少部分所述第二像素界定单元的开口面积大于所述第一像素界定单元的开口面积；所述显示像素界定区在所述显示区域内，所述辅助像素界定区在所述周边区域内，所述多个第一像素界定单元配置为形成显示像素，所述多个第二像素界定单元配置为形成辅助像素。
例如，本公开至少一实施例提供的显示基板中，所述多个第二像素界定单元围绕所述显示像素界定区逐层排列，并且以靠近所述显示像素界定区为内侧，所述辅助像素界定区中的所述第二像素界定单元的开口面积从内层到外层逐渐增大。
例如，本公开至少一实施例提供的显示基板中，所述多个第一像素界定单元的开口面积大小相同，并且在最内层的所述第二像素界定单元的开口面积等于所述第一像素界定单元的开口面积。
例如，本公开至少一实施例提供的显示基板中，所述多个第一像素界定单元的开口面积大小不同，并且位于最内层的所述第二像素界定单元的开口面积等于与其相邻的所述第一像素界定单元的开口面积。
例如，本公开至少一实施例提供的显示基板中，所述辅助像素界定区包括3-6层所述第二像素界定单元。
例如，本公开至少一实施例提供的显示基板中，位于同一层的所述第二像素界定单元的开口相对于与其最近邻的所述第一像素界定单元的开口形状相同，大小成相同比例放大。
例如，本公开至少一实施例提供的显示基板中，所述第一像素界定单元和所述第二像素界定单元呈矩阵形式排列。
本公开至少一实施例提供一种利用上述任一所述的显示基板中的像素界定层进行喷墨打印的方法，包括：在所述第一像素界定单元和所述第二像素界定单元的开口内进行喷墨打印。
例如，本公开至少一实施例提供的喷墨打印的方法中，在所述第二像素界定单元的开口中喷墨打印的墨水量不少于在所述第一像素界定单元的开口中喷墨打印的墨水量。
例如，本公开至少一实施例提供的喷墨打印的方法中，在所述第二像素界定单元和所述第一像素界定单元中喷墨打印的墨水量分别与所述第二像素界定单元和所述第一像素界定单元的开口面积大小成正比。
本公开至少一实施例提供一种显示基板的制备方法，所述显示基板包括显示区域和周边区域，该方法包括：形成像素界定层，所述像素界定层包括：显示像素界定区和围绕所述显示像素界定区的辅助像素界定区；其中，所述显示像素界定区包括多个第一像素界定单元；所述辅助像素界定区包括多个第二像素界定单元，并且至少部分所述第二像素界定单元的开口面积大于所述第一像素界定单元的开口面积；所述显示像素界定区形成于所述显示区域内，所述辅助像素界定区形成于所述周边区域内；通过所述多个第一像素界定单元在所述显示区域形成多个第一像素，通过所述多个第二像素界定单元在所述周边区域形成多个第二像素。
例如，本公开至少一实施例提供的显示基板的制备方法中，形成所述多个第一像素和所述多个第二像素包括：在所述第一像素界定单元和所述第二像素界定单元的开口内喷墨打印有机材料以形成有机功能层。
例如，本公开至少一实施例提供的显示基板的制备方法中，在所述第二像素界定单元和所述第一像素界定单元的开口中喷墨打印的有机材料的量分别与所述第二像素界定单元和所述第一像素界定单元的开口面积大小成正比。
例如，本公开至少一实施例提供的显示基板的制备方法中，所述有机功能层包括发光层、电子注入层、空穴注入层、电子传输层和空穴传输层中的一种或几种。
本公开至少一实施例提供一种显示装置，包括上述任一所述的显示基板。
附图说明
为了更清楚地说明本公开实施例的技术方案，下面将对实施例的附图作简单地介绍，显而易见地，下面描述中的附图仅仅涉及本公开的一些实施例，而非对本公开的限制。
图1为本公开一实施例提供的显示基板的像素界定层的平面示意图一；
图2为本公开一实施例提供的显示基板的像素界定层的平面示意图二；
图3为本公开一实施例提供的显示基板的像素界定层的平面示意图三；
图4为本公开一实施例提供的显示基板的截面示意图；
图5A和图5B为本公开一实施例提供的显示基板在制备过程中的截面图；
图6为本公开一实施例提供的显示面板的示意图；
图7为本公开一实施例提供的显示装置的示意图。
具体实施方式
为使本公开实施例的目的、技术方案和优点更加清楚，下面将结合本公开实施例的附图，对本公开实施例的技术方案进行清楚、完整地描述。显然，所描述的实施例是本公开的一部分实施例，而不是全部的实施例。基于所描述的本公开的实施例，本领域普通技术人员在无需创造性劳动的前提下所获 得的所有其他实施例，都属于本公开保护的范围。
除非另外定义，本公开使用的技术术语或者科学术语应当为本公开所属领域内具有一般技能的人士所理解的通常意义。本公开中使用的“第一”、“第二”以及类似的词语并不表示任何顺序、数量或者重要性，而只是用来区分不同的组成部分。“包括”或者“包含”等类似的词语意指出现该词前面的元件或者物件涵盖出现在该词后面列举的元件或者物件及其等同，而不排除其他元件或者物件。“连接”或者“相连”等类似的词语并非限定于物理的或者机械的连接，而是可以包括电性的连接，不管是直接的还是间接的。“上”、“下”、“左”、“右”等仅用于表示相对位置关系，当被描述对象的绝对位置改变后，则该相对位置关系也可能相应地改变。
通常，显示基板的像素界定层具有多个开口，利用喷墨打印法在这些开口中进行喷墨打印时，喷墨打印在位于基板边缘处开口的墨水干燥速度往往较快，而喷墨打印在基板内部开口的墨水干燥速度往往较慢，导致喷墨打印的墨水在位于基板边缘处和位于基板内部的开口中的干燥速度不一致，这将使得喷墨打印在不同位置开口中的墨水干燥后产生的形态不均匀。例如，利用喷墨打印法在开口中打印有机材料以形成有机功能层时，不同位置开口处形成的有机功能层形态(例如厚度)不均匀，由此会导致显示基板在工作时的显示亮度不均匀，严重影响显示基板的显示效果。
为了平衡喷墨打印的墨水在位于边缘处和位于内部的开口中的干燥速度，像素界定层中可以围绕显示像素设置辅助像素，并且在该辅助像素内喷墨打印的墨水与显示像素相同，但是该辅助像素在显示基板显示时不会发光。
本公开至少一实施例提供的一种显示基板，该显示基板具有显示区域和周边区域，并包括像素界定层，该像素界定层包括：显示像素界定区和围绕显示像素界定区的辅助像素界定区；其中，显示像素界定区包括多个第一像素界定单元；辅助像素界定区包括多个第二像素界定单元，并且第二像素界定单元的开口面积大于第一像素界定单元的开口面积；显示像素界定区在显示区域内，辅助像素界定区在周边区域内，多个第一像素界定单元配置为形成显示像素，多个第二像素界定单元配置为形成辅助像素。
本公开至少一实施例提供一种利用上述显示基板的像素界定层进行喷墨打印的方法，该方法包括：在第一像素界定单元和第二像素界定单元的开 口内进行喷墨打印。
本公开至少一实施例提供一种显示基板的制备方法，该显示基板包括显示区域和周边区域，该方法包括：形成像素界定层，该像素界定层包括：显示像素界定区和围绕显示像素界定区的辅助像素界定区；其中，显示像素界定区包括多个第一像素界定单元；辅助像素界定区包括多个第二像素界定单元，并且至少部分第二像素界定单元的开口面积大于第一像素界定单元的开口面积；显示像素界定区形成于显示区域内，辅助像素界定区形成于周边区域内；通过多个第一像素界定单元在显示区域形成多个第一像素，通过多个第二像素界定单元在周边区域形成多个第二像素。
本公开至少一实施例提供一种显示装置，包括上述显示基板。
本公开至少一实施例提供的显示基板中的像素界定层可以通过设置较少的第二像素界定单元即可实现至少平衡喷墨打印在各个第一像素界定单元开口中墨水的干燥速度，进而使第一像素界定单元中墨水干燥后的形态更加均匀；另外，设置较少的第二像素界定单元可以减小辅助像素界定区所占有的空间大小，从而有利于显示基板的窄边框设计，并且还可以简化制备工艺，进而节约成本。
下面通过几个具体的实施例对本公开的显示基板及其制备方法、喷墨打印方法和显示装置进行说明。
本公开至少一实施例提供一种显示基板，该显示基板例如可以为有机发光二极管(OLED)显示面板的阵列基板；该显示基板包括像素界定层。如图1所示，该像素界定层包括显示像素界定区10和围绕显示像素界定区10的辅助像素界定区20；显示像素界定区10包括多个第一像素界定单元101；辅助像素界定区20包括多个第二像素界定单元201，并且至少部分第二像素界定单元201的开口面积大于第一像素界定单元101的开口面积。
例如，图4示出了本实施例提供的显示基板的截面示意图，如图4所示，该显示基板具有显示区域1和周边区域2，显示像素界定区10在显示区域1内，辅助像素界定区20在周边区域2内，(图中示出的像素界定层为图1中像素界定层沿线A-A的剖视图，在与线A-A垂直方向上的剖视图与此类似，本公开不再提供)，并且多个第一像素界定单元101配置为形成显示像素，多个第二像素界定单元201配置为形成辅助像素。
本实施例中，如图1所示，第一像素界定单元和第二像素界定单元例如 可以呈矩阵形式排列，例如多个像素界定单元形成行与列且彼此对齐排列的形式。例如，多个第二像素界定单元201可以围绕显示像素界定区10逐层排列，并且以显示像素界定区10为内侧，第二像素界定单元201的开口面积从内层到外层逐渐增大。
如图1所示，本示例中，多个第二像素界定单元201围绕显示像素界定区10依次形成L1层、L2层…直到LN层，并且从L1到LN层，第二像素界定单元201的开口面积逐渐增大。本实施例中，多个第二像素界定单元201例如可以围绕显示像素界定区10形成3-6层，例如4层或5层。
本实施例中，由于在辅助像素界定区20中，从L1到LN层第二像素界定单元201的开口面积逐渐增大，因此在利用该像素界定层进行喷墨打印的过程中，可以根据像素界定单元的开口面积选择在其中喷墨打印的墨水的量，例如在第二像素界定单元和第一像素界定单元中喷墨打印的墨水量可以分别与第二像素界定单元和第一像素界定单元的开口面积大小成正比。因此，喷墨打印在辅助像素界定区的墨水在蒸发时产生的蒸汽压可以在辅助像素界定区中从外层到内层逐渐变化，而不会产生突变，从而更好地实现平衡喷墨打印在显示像素界定区10中墨水的干燥速度的技术效果。
如图1所示，本实施例的一个示例中，位于显示像素界定区10的多个第一像素界定单元101的开口面积大小例如可以相同，并且在辅助像素界定区20中，位于最内层，即L1层的第二像素界定单元201的开口面积例如可以等于第一像素界定单元101的开口面积。
如图2所示，本实施例的另一个示例中，位于显示像素界定区10的多个第一像素界定单元201的开口面积大小例如可以不同，例如用于显示红色的子像素和显示绿色的子像素的开口面积可以小于显示蓝色的子像素的开口面积；并且，在辅助像素界定区20中，位于同层的第二像素界定单元201的开口面积例如也可以不同。例如，位于最内层，即L1层的第二像素界定单元201的开口面积例如可以等于与其相邻的第一像素界定单元101的开口面积。
本实施例中，当辅助像素界定区20中位于L1层的第二像素界定单元201的开口面积等于与其相邻的第一像素界定单元101的开口面积时，在利用该像素界定层进行喷墨打印的过程中，该第二像素界定单元中喷墨打印的墨水量可以等于与其相邻的第一像素界定单元中喷墨打印的墨水量，这样可 以减少辅助像素界定区与显示像素界定区边界处由于墨水蒸发而产生的蒸汽压的突变，进而防止由于边界处的蒸汽压差异而导致的位于显示像素界定区边缘的第一像素界定单元中墨水干燥速度不同于位于显示像素界定区内层的第一像素界定单元中墨水干燥速度。
如图3所示，本实施例的一个示例中，当位于显示像素界定区的多个第一像素界定单元101的开口面积大小不同时，在辅助像素界定区20中，位于同层的第二像素界定单元201的开口面积例如也可以相同。例如，位于最内层，即L1层的第二像素界定单元201的开口面积等于显示像素界定区中面积最大的第一像素界定单元101的开口面积。
本实施例的一个示例中，在辅助像素界定区20中，位于同一层的第二像素界定单元201的开口相对于与其最近邻的第一像素界定单元101的开口来说，形状相同，大小成相同比例放大。
例如，在如图1所示的情况下，位于显示像素界定区10的多个第一像素界定单元101的开口面积大小相同，并且在辅助像素界定区20中，位于同层的第二像素界定单元201的开口面积大小相同，并且从内层到外层，第二像素界定单元201的开口面积大小与第一像素界定单元101的开口面积大小之比依次增大，并且增大的幅度例如可以相同。
例如，当第一像素界定单元101的开口率[开口率为像素界定单元的开口面积与整个像素界定单元所占的面积(图中虚线方框圈出的部分)之比，本实施例中，第一像素界定单元和第二像素界定单元的整体占有面积相同]为30％并且第二像素界定单元201围绕显示像素界定区10形成5层时，位于L1层的第二像素界定单元201的开口率例如可以为30％，位于L2层的第二像素界定单元201的开口率例如可以为40％，位于L3层的第二像素界定单元201的开口率例如可以为50％…位于L5层的第二像素界定单元201的开口面积例如可以为70％，即第二像素界定单元201的开口率从内层到外层依次增加10％。
例如，当第一像素界定单元101的开口率为40％并且第二像素界定单元201围绕显示像素界定区10形成3层时，位于L1层的第二像素界定单元201的开口率例如可以为50％，位于L2层的第二像素界定单元201的开口率例如可以为60％，位于L3层的第二像素界定单元201的开口率例如可以为70％，即第二像素界定单元201的开口率从内层到外层依次增加10％。本实 施例中，位于辅助像素界定区中第二像素界定单元的层数较少，并且可以根据需求进行调整。
例如，在如图2所示的情况下，位于显示像素界定区10的多个第一像素界定单元101的开口面积大小不同，在辅助像素界定区20中，位于同层的第二像素界定单元201的开口面积大小也不同，并且位于同层的第二像素界定单元201的开口面积大小与其最近邻的，即与其同行或同列的位于显示像素界定区10最外侧的第一像素界定单元101的开口面积大小之比相同，并且从内层到外层，该比值依次增大，并且增大的幅度例如可以相同。
例如，当第一像素界定单元包括三种不同大小的开口，例如其开口率分别为30％、35％和40％，并且第二像素界定单元201围绕显示像素界定区10形成4层时，在L1层中，与上述三种具有不同大小的开口的第一像素界定单元101最近邻的第二像素界定单元201的开口率例如可以分别为30％、35％和40％；在L2层中，相应的第二像素界定单元201的开口率例如可以分别为35％、40％和45％；在L3层中，相应的第二像素界定单元201的开口率例如可以分别为40％、45％和50％，在L4层中，相应的第二像素界定单元201的开口率例如可以分别为45％、50％和60％，即第二像素界定单元201的开口率从内层到外层依次增加5％。
本实施例的一个示例中，在多个第一像素界定单元101的开口面积大小在不同的情况下，位于同层的第二像素界定单元201的开口面积大小也可以相同，例如可以将第二像素界定单元201的开口面积大小与具有最大开口的第一像素界定单元101的开口面积相比较，从内层到外层，第二像素界定单元201的开口面积大小与最大的第一像素界定单元101的开口面积大小之比依次增大，并且增大的幅度例如可以相同。其增大的具体方式与图1所示的情况基本相同，在此不再赘述。
需要说明的是，本实施例中，在辅助像素界定区20中，从内层到外层，第二像素界定单元201的开口面积大小与和其最近邻的第一像素界定单元101的开口面积大小之比依次增大的幅度可以根据例如喷墨打印材料的性质等进行选择，其增大的幅度可以相同也可以不同，这些材料性质包括溶剂蒸发或挥发速率等。
本实施例中，第一像素界定单元101和第二像素界定单元201例如可以呈矩形，并且第二像素界定单元201相对于第一像素界定单元101增大时， 其长边和短边相对于第一像素界定单元101的长边和短边例如可以等比例增大，即保持第一像素界定单元101和第二像素界定单元201的形状相同。当然，第一像素界定单元101和第二像素界定单元201也可以为其他合适的形状，例如平行四边形、梯形等，本实施例对此不做限定。
本实施例中，显示基板的有机功能层例如可以通过在像素界定层的第一像素界定单元和第二像素界定单元的开口内喷墨打印有机材料而形成。该像素界定层可以使得喷墨打印形成的有机功能层的形态更加均匀，例如使得有机功能层的厚度及表面形貌等更加均匀。本实施例中，该有机功能层例如可以为有机发光层、电子注入层、空穴注入层、电子传输层和空穴传输层等，本实施例对此不做限定。
本实施例中，显示基板当然还可以包括像素驱动电路、阳极层、阴极层、绝缘层等其他功能结构，本实施例不再赘述。
本实施例提供的显示基板中的像素界定层具有显示像素界定区和围绕显示像素界定区的辅助像素界定区，该辅助像素界定区可以降低位于显示像素界定区边缘的第一像素界定单元中墨水的干燥速度，进而使得显示像素界定区中各个像素界定单元开口中喷墨打印的墨水干燥速度基本一致，进而使墨水在干燥后的形态更加均匀，例如墨水的成膜厚度等更加均匀。因此，本实施例提供的显示基板的有机功能层形态更加均匀，从而可以提高显示基板的显示均匀性，使得该显示基板具有更好的显示效果。
本实施例中，至少部分位于辅助像素界定区的第二像素界定单元的开口面积大于位于显示像素界定区的第一像素界定单元的开口面积，因此在第二像素界定单元和第一像素界定单元中进行喷墨打印以形成功能层(例如电子注入层、电子传输层、有机发光层、空穴传输层、空穴注入层等之一或组合)时，可以根据像素界定单元的开口面积选择在其中喷墨打印的墨水的量，例如在第二像素界定单元中喷墨打印较多的墨水，在第一像素界定单元中喷墨打印较少的墨水。因此本实施例提供的像素界定层通过设置较少的第二像素界定单元(例如3层)即可实现至少平衡喷墨打印在各个第一像素界定单元开口中墨水的干燥速度，进而使第一像素界定单元中墨水干燥后的形态更加均匀(若辅助像素界定区的第二像素界定单元的开口面积与显示像素界定区的第一像素界定单元的开口面积相同，特别是在像素开口中将要形成的功能层厚度较厚的情况下，需要设置10层以上的第二像素界定单元才能实现平 衡喷墨打印在各个第一像素界定单元开口中墨水的干燥速度的效果)；另外，设置较少的第二像素界定单元可以减小辅助像素界定区所占有的空间大小，从而有利于显示基板的窄边框设计，同时设置较少的第二像素界定单元还可以简化制备工艺，进而节约成本。
本公开至少一实施例提供一种利用上述实施例提供的显示基板中的像素界定层进行喷墨打印的方法，该方法可以用于形成例如OLED显示面板的阵列基板，该方法包括：在第一像素界定单元和第二像素界定单元的开口内进行喷墨打印，由此形成所需要的功能层。
例如，本实施例中，进行喷墨打印时，在第二像素界定单元的开口中喷墨打印的墨水量可以多于在第一像素界定单元的开口喷墨打印的墨水量。例如，在第二像素界定单元和第一像素界定单元中喷墨打印的墨水量可以分别与第二像素界定单元和第一像素界定单元的开口面积大小成正比。因此，通过在位于不同位置中具有不同开口面积的素界定单元中喷墨打印不同的墨水量，使得墨水在干燥时，从辅助像素界定区的外层到内层，其上方由于墨水蒸发而产生的蒸汽压的差异逐渐减小，而不会产生突变，使得至少在显示像素界定区中各第一像素界定单元上方的蒸汽压接近或相同，从而各第一像素界定单元中墨水的干燥速度相同，进而使得墨水干燥后的形态均匀。
例如，当辅助像素界定区中位于最内层，即L1层的第二像素界定单元的开口面积等于与其相邻的显示像素界定区中第一像素界定单元的开口面积时，该第二像素界定单元中喷墨打印的墨水量等于与其相邻的第一像素界定单元中喷墨打印的墨水量，这样可以减少辅助像素界定区与显示像素界定区边界处产生蒸汽压的突变，进而防止由于边界处的蒸汽压差异而导致的位于显示像素界定区边缘的第一像素界定单元中墨水干燥速度不同于位于显示像素界定区内层的第一像素界定单元中墨水干燥速度。
本实施例中，在第二像素界定单元的开口中喷墨打印的墨水量例如可以从内层到外层依次增大，并且该增大的幅度例如可以相同。例如，当第一像素界定单元和第二像素界定单元呈矩形，并且第二像素界定单元相对于第一像素界定单元增大时，可以保持第一像素界定单元和第二像素界定单元的形状相同，即位于同层的第二像素界定单元的长边和短边相对于第一像素界定单元的长边和短边呈相同比例增大，并且在辅助像素界定区中，从内层到外层该增大的幅度相同；此时，在位于不同位置的保持形状相同而大小不同的 第一像素界定单元和第二像素界定单元进行喷墨打印时，各像素界定单元的形状相同并且在辅助像素界定区中从内层到外层像素界定单元中喷墨打印的墨水量增大的幅度相同，由此可以更好地调节各像素界定单元上方由于墨水蒸发产生的蒸汽压大小，使蒸汽压的变化更加均匀，从而更好地实现至少在显示像素界定区中各第一像素界定单元上方的蒸汽压接近或相同，进而使得各第一像素界定单元中墨水干燥的速度基本相同，从而使墨水干燥后的形态更加均匀。
本实施例提供的喷墨打印方法可以根据各像素界定单元的位置及其开口面积等选择在其中喷墨打印墨水的量，因此可以不同程度地调控位于边缘的第二像素界定单元中墨水的干燥速度，使得至少在位于显示像素界定区的第一像素界定单元中墨水的干燥速度基本相同，进而使墨水在干燥后的形态更加均匀。
本公开至少一实施例提供一种显示基板的制备方法，如图5A所示，该显示基板包括显示区域1和周边区域2，该方法包括：形成像素界定层(图中示出的像素界定层为图1中像素界定层沿线A-A的剖视图)。该像素界定层包括：显示像素界定区和围绕显示像素界定区的辅助像素界定区；显示像素界定区包括多个第一像素界定单元101；辅助像素界定区包括多个第二像素界定单元201，并且至少部分第二像素界定单元201的开口面积大于第一像素界定单元101的开口面积。该像素界定层的显示像素界定区和辅助像素界定区分别形成于显示基板的显示区域1和周边区域2内；并且通过多个第一像素界定单元101在显示区域1形成多个第一像素，通过多个第二像素界定单元201在周边区域形成多个第二像素。
本实施例中，在显示区域1中形成的第一像素为显示像素，用于显示有机发光显示基板所要显示的画面，例如可以为显示红色、绿色、蓝色或白色的像素；在周边区域2中形成的第二像素为辅助像素，用于辅助显示像素的形成，使显示像素中形成的各功能层形态更加均匀。
本实施例中，如图5B所示，形成多个第一像素和多个第二像素例如可以包括在第一像素界定单元101和第二像素界定单元201的开口内喷墨打印有机材料以形成有机功能层301。有机功能层301例如可以为有机发光层、电子注入层、空穴注入层、电子传输层和空穴传输层中的一种或几种，本实施例对此不做限定。
本实施例的一个示例中，当所形成的显示基板的发光层为可以发出白光的发光层时，形成于显示区域10的多个第一像素界定单元101的开口面积大小例如可以相同，即形成如图1所示的像素界定层。该情况下，显示基板可以通过白色发光层配合彩色滤光片来实现显示基板的全彩化。
本实施例的另一个示例中，当所形成的机发光显示基板的发光层为可以发出彩色光的发光层，例如发出红色光、绿色光和蓝色光的彩色发光层时，形成于显示区域10的多个第一像素界定单元101的开口面积大小例如可以不同，例如形成如图2或图3所示的像素界定层。该情况下，第一像素界定单元101例如可以包括具有三种不同大小开口的像素界定单元，并且该像素界定单元由大到小例如可以对应于蓝色像素界定单元、绿色像素界定单元和红色像素界定单元，因此可以在上述像素界定单元内喷墨打印相应颜色的有机材料从而分别形成蓝色发光层、绿色发光层和红色发光层。该有机发光显示基板的发光层可以在通电之后直接发出彩色光。
本实施例中，例如可以根据第二像素界定单元和第一像素界定单元的开口面积选择在第二像素界定单元和第一像素界定单元的开口中喷墨打印的有机材料的量。
例如，在本实施例的一个示例中，在第二像素界定单元和第一像素界定单元的开口中喷墨打印的有机材料的量分别与第二像素界定单元和第一像素界定单元的开口面积大小成正比，因此从外层到内层，喷墨打印在第二像素界定单元中有机材料的量逐渐减少。这样可以不同程度地降低位于边缘的第二像素界定单元中有机材料的干燥速度，进而使得喷墨打印在各个像素界定单元开口中有机材料的干燥速度基本相同。这使得在各个像素界定单元开口中喷墨打印的有机材料在干燥后的形态更加均匀或者至少在第一像素界定单元中喷墨打印的有机材料在干燥后的形态更加均匀。于是，在第一像素界定单元中形成更加均匀的有机功能层，例如形成厚度及表面形貌等更加均匀的有机功能层。因此，利用本实施例提供的方法制备得到的有机发光显示基板具有更好的显示均匀性，进而由此得到的显示装置具有更好的显示效果。
另外，本实施例中，由于形成于周边区域的第二像素界定单元的开口面积大于形成于显示区域的第一像素界定单元的开口面积，因此形成较少的第二像素界定单元即可实现至少平衡喷墨打印在各个第一像素界定单元开口 中有机材料的干燥速度的技术效果。利用本实施例提供的有机发光显示基板的制备方法形成的位于周边区域的第二像素的数量可以更少，从而有利于缩小所形成的显示基板的周边区域，实现显示基板的窄边框设计。
本公开至少一实施例提供一种显示面板，如图6所示，该显示面板4包括上述显示基板3。该显示面板4例如可以为有机发光显示面板等。该显示面板4具有优异的显示均匀性，并且该显示面板4边框较窄，可以实现大屏化显示。
本公开至少一实施例还提供一种显示装置，如图7所示，该显示装置5包括上述显示面板4。该显示装置5例如可以为手机、电脑、电视、电子书等任何具有显示功能的电子产品，本实施例对此不做限定。
还有以下几点需要说明：
(1)本公开实施例附图只涉及到与本公开实施例涉及到的结构，其他结构可参考通常设计。
(2)为了清晰起见，在用于描述本公开的实施例的附图中，层或区域的厚度被放大或缩小，即这些附图并非按照实际的比例绘制。可以理解，当诸如层、膜、区域或基板之类的元件被称作位于另一元件“上”或“下”时，该元件可以“直接”位于另一元件“上”或“下”或者可以存在中间元件。
(3)在不冲突的情况下，本公开的实施例及实施例中的特征可以相互组合以得到新的实施例。
以上所述仅是本发明的示范性实施方式，而非用于限制本发明的保护范围，本发明的保护范围由所附的权利要求确定。

Claims (15)

  1. 一种显示基板，具有显示区域和周边区域，包括像素界定层；
    所述像素界定层包括：显示像素界定区和围绕所述显示像素界定区的辅助像素界定区；其中，所述显示像素界定区包括多个第一像素界定单元；所述辅助像素界定区包括多个第二像素界定单元，并且至少部分所述第二像素界定单元的开口面积大于所述第一像素界定单元的开口面积；
    所述显示像素界定区在所述显示区域内，所述辅助像素界定区在所述周边区域内，
    所述多个第一像素界定单元配置为形成显示像素，所述多个第二像素界定单元配置为形成辅助像素。
  2. 根据权利要求1所述的显示基板，其中，所述多个第二像素界定单元围绕所述显示像素界定区逐层排列，并且以靠近所述显示像素界定区为内侧，所述辅助像素界定区中的所述第二像素界定单元的开口面积从内层到外层逐渐增大。
  3. 根据权利要求2所述的显示基板，其中，所述多个第一像素界定单元的开口面积大小相同，并且在最内层的所述第二像素界定单元的开口面积等于所述第一像素界定单元的开口面积。
  4. 根据权利要求2所述的显示基板，其中，所述多个第一像素界定单元的开口面积大小不同，并且位于最内层的所述第二像素界定单元的开口面积等于与其相邻的所述第一像素界定单元的开口面积。
  5. 根据权利要求2-4任一所述的显示基板，其中，所述辅助像素界定区包括3-6层所述第二像素界定单元。
  6. 根据权利要求2-5任一所述的显示基板，其中，位于同一层的所述第二像素界定单元的开口相对于与其最近邻的所述第一像素界定单元的开口形状相同，大小成相同比例放大。
  7. 根据权利要求1-6任一所述的显示基板，其中，所述第一像素界定单元和所述第二像素界定单元呈矩阵形式排列。
  8. 一种利用权利要求1-7任一所述的显示基板的像素界定层进行喷墨打印的方法，包括：
    在所述第一像素界定单元和所述第二像素界定单元的开口内进行喷墨 打印。
  9. 根据权利要求8所述的喷墨打印的方法，其中，在所述第二像素界定单元的开口中喷墨打印的墨水量不少于在所述第一像素界定单元的开口中喷墨打印的墨水量。
  10. 根据权利要求8所述的喷墨打印的方法，其中，在所述第二像素界定单元和所述第一像素界定单元中喷墨打印的墨水量分别与所述第二像素界定单元和所述第一像素界定单元的开口面积大小成正比。
  11. 一种显示基板的制备方法，所述显示基板包括显示区域和周边区域，该方法包括：
    形成像素界定层，所述像素界定层包括：显示像素界定区和围绕所述显示像素界定区的辅助像素界定区；其中，所述显示像素界定区包括多个第一像素界定单元；所述辅助像素界定区包括多个第二像素界定单元，并且至少部分所述第二像素界定单元的开口面积大于所述第一像素界定单元的开口面积；
    所述显示像素界定区形成于所述显示区域内，所述辅助像素界定区分别形成于所述周边区域内；
    通过所述多个第一像素界定单元在所述显示区域形成多个第一像素，
    通过所述多个第二像素界定单元在所述周边区域形成多个第二像素。
  12. 根据权利要求11所述的显示基板的制备方法，其中，形成所述多个第一像素和所述多个第二像素包括：
    在所述第一像素界定单元和所述第二像素界定单元的开口内喷墨打印有机材料以形成有机功能层。
  13. 根据权利要求12所述的显示基板的制备方法，其中，在所述第二像素界定单元和所述第一像素界定单元的开口中喷墨打印的有机材料的量分别与所述第二像素界定单元和所述第一像素界定单元的开口面积大小成正比。
  14. 根据权利要求12或13所述的显示基板的制备方法，其中，所述有机功能层包括发光层、电子注入层、空穴注入层、电子传输层和空穴传输层中的一种或几种。
  15. 一种显示装置，包括权利要求1-7任一所述的显示基板。
PCT/CN2018/106006 2017-09-28 2018-09-17 显示基板及其制备方法、喷墨打印方法、显示装置 WO2019062580A1 (zh)

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