WO2021063390A1 - 显示基板、显示面板及显示设备 - Google Patents

显示基板、显示面板及显示设备 Download PDF

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Publication number
WO2021063390A1
WO2021063390A1 PCT/CN2020/119278 CN2020119278W WO2021063390A1 WO 2021063390 A1 WO2021063390 A1 WO 2021063390A1 CN 2020119278 W CN2020119278 W CN 2020119278W WO 2021063390 A1 WO2021063390 A1 WO 2021063390A1
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Prior art keywords
contact hole
substrate
light
orthographic projection
emitting
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PCT/CN2020/119278
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English (en)
French (fr)
Inventor
许名宏
Original Assignee
京东方科技集团股份有限公司
合肥鑫晟光电科技有限公司
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Application filed by 京东方科技集团股份有限公司, 合肥鑫晟光电科技有限公司 filed Critical 京东方科技集团股份有限公司
Priority to US17/419,944 priority Critical patent/US20220069030A1/en
Publication of WO2021063390A1 publication Critical patent/WO2021063390A1/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
    • H10K59/30—Devices specially adapted for multicolour light emission
    • H10K59/35—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels
    • H10K59/353—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels characterised by the geometrical arrangement of the RGB subpixels
    • 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
    • H10K59/121—Active-matrix OLED [AMOLED] displays characterised by the geometry or disposition of pixel elements
    • 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
    • H10K59/10—OLED displays
    • H10K59/12—Active-matrix OLED [AMOLED] displays
    • H10K59/131—Interconnections, e.g. wiring lines or terminals
    • H10K59/1315—Interconnections, e.g. wiring lines or terminals comprising structures specially adapted for lowering the resistance
    • 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
    • H10K59/352—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels the areas of the RGB subpixels being different
    • 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
    • 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
    • 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
    • H10K59/38—Devices specially adapted for multicolour light emission comprising colour filters or colour changing media [CCM]
    • 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
    • H10K59/8791—Arrangements for improving contrast, e.g. preventing reflection of ambient light
    • H10K59/8792—Arrangements for improving contrast, e.g. preventing reflection of ambient light comprising light absorbing layers, e.g. black layers

Definitions

  • the present disclosure relates to the field of display technology, and in particular to a display substrate, a display panel, and a display device.
  • a display substrate which has a plurality of pixel regions.
  • the display substrate includes a substrate, a reservoir layer provided on the substrate, an electrical connection structure provided on the substrate, and a light emitting layer provided in each of the reservoirs.
  • the storage tank layer is provided with a contact hole and a plurality of storage tanks, the plurality of storage tanks are located at the periphery of the contact hole, and each of the storage tanks is spaced apart from the contact hole. In a direction perpendicular to the substrate, the plurality of reservoirs and the contact holes penetrate the reservoir layer. A part of the electrical connection structure passes through the contact hole.
  • the position point with the smallest distance from the wall surface of the at least one tank located at the periphery of the contact hole is the first position point.
  • the orthographic projection of the contact hole and the plurality of reservoirs on the substrate is a polygon or an approximate polygon
  • the first position point is not located at a corner of the polygon or the approximate polygon
  • the contact hole The side closest to the storage tank is not parallel to the side of the storage tank close to the contact hole.
  • one side of the orthographic projection of the contact hole on the substrate is directly opposite to the corner of the orthographic projection of a reservoir located on the periphery of the contact hole on the substrate, and The first position point is on this side.
  • the corners of the orthographic projection of the reservoir on the substrate are rounded corners.
  • the tangent at the bisecting point of the rounded boundary of the contact hole facing the reservoir is the same as the contact hole
  • the sides facing the storage tank are parallel to each other.
  • a plurality of sides of the contact hole are respectively positioned in the contact The corners of the plurality of storage tanks around the hole are directly opposite.
  • the orthographic projection of the contact hole on the substrate is a rectangle.
  • Four storage grooves are arranged in one pixel area, and the four sides of the rectangular orthographic projection of the contact hole are respectively opposite to the corners of the four storage grooves located on the periphery of the contact hole.
  • three storage grooves are provided in one pixel area, and three of the four sides of the rectangular orthographic projection of the contact hole are respectively directly opposite to the corners of the three storage grooves located at the periphery of the contact hole .
  • four storage grooves are provided in one pixel area.
  • the light-emitting layers provided in the two storage tanks are light-emitting layers capable of emitting blue light, and the light-emitting layers provided in the remaining two storage tanks are light-emitting layers capable of emitting red light and light-emitting layers capable of emitting green light.
  • the contact hole is located at the center of a rectangle formed by connecting the centers of the four storage tanks in sequence.
  • the area of the orthographic projection of the four storage tanks on the substrate is the same.
  • three storage grooves are provided in one pixel area.
  • One of the storage tanks is a first storage tank
  • the light-emitting layer provided in the first storage tank is a light-emitting layer capable of emitting blue light
  • the remaining two storage tanks are second storage tanks
  • the two first storage tanks are
  • the light-emitting layers provided in the two storage tanks are respectively a light-emitting layer capable of emitting red light and a light-emitting layer capable of emitting green light.
  • the area of the orthographic projection of the first reservoir on the substrate is larger than the area of the orthographic projection of each of the second reservoirs on the substrate.
  • three of the storage tanks are arranged around the contact hole.
  • the ratio of the area of the orthographic projection of the first reservoir on the substrate to the area of the orthographic projection of each of the second reservoirs on the substrate is greater than or equal to 1.5 , And less than or equal to 6.
  • the electrical connection structure includes an auxiliary electrode disposed between the substrate and the reservoir layer, and an auxiliary electrode disposed on the reservoir layer and the light-emitting layer away from the substrate. Side of the cathode layer.
  • the auxiliary electrode is located on a side of the contact hole close to the substrate, and at least a part of the cathode layer is trapped in the contact hole, so that the cathode layer and the auxiliary electrode are electrically connected through the contact hole.
  • the display substrate further includes an anode disposed between the substrate and the light-emitting layer, and a pixel circuit disposed between the anode and the substrate.
  • the pixel circuit is electrically connected to the anode.
  • a display panel which includes the display substrate described in the above embodiments, and a photoresist cover plate superimposed on the display substrate.
  • the photoresist cover plate includes a plurality of color filter photoresists, and each color filter photoresist is arranged opposite to one of the storage tanks of the display substrate.
  • the light-emitting layer provided in at least two of the storage tanks is a light-emitting layer capable of emitting blue light.
  • the color filter photoresist in the photoresist cover plate opposite to the light emitting layer capable of emitting blue light is a blue photoresist, and the blue photoresist corresponding to different light emitting layers capable of emitting blue light in the same pixel area can be The wavelength range of the transmitted blue light is different, or the peak of the blue light spectrum that can be transmitted is different.
  • a display device including the display panel described in the above embodiments.
  • FIG. 1 is a top view of a related art display substrate
  • FIG. 2 is a top view of a display substrate according to some embodiments of the present disclosure.
  • Figure 3 is a cross-sectional view along the section line O-O' in Figure 2;
  • FIG. 4 is a partial enlarged view of the pixel area of the display substrate in FIG. 2;
  • FIG. 5 is a top view of a pixel area of a related art display substrate
  • FIG. 6 is a top view of another display substrate according to some embodiments of the present disclosure.
  • FIG. 7 is a partial enlarged view of the pixel area of the display substrate in FIG. 6;
  • FIG. 8 is a pixel distribution diagram of a display substrate according to some embodiments of the present disclosure.
  • FIG. 9 is a top view of still another display substrate according to some embodiments of the present disclosure.
  • FIG. 10 is a structural diagram of a display panel according to some embodiments of the present disclosure.
  • FIG. 11 is a structural diagram of a display device according to some embodiments of the present disclosure.
  • first and second are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with “first” and “second” may explicitly or implicitly include one or more of these features. In the description of the embodiments of the present disclosure, unless otherwise specified, "plurality" means two or more.
  • approximately includes the stated value and the average value within the acceptable deviation range of the specified value, where the acceptable deviation range is considered by a person of ordinary skill in the art to consider the measurement being discussed and the The measurement-related error (ie, the limitations of the measurement system) of a specific quantity is determined.
  • an OLED display panel includes a substrate, and a plurality of sub-pixels disposed on the substrate. Each sub-pixel is sequentially disposed on the pixel circuit, anode, light-emitting layer, and cathode on the substrate, and the cathodes of the plurality of sub-pixels are connected to each other. A film covering the entire surface is formed.
  • the light emitted by the light-emitting layer is emitted from the cathode.
  • the cathode needs to be set as a transparent or semi-transparent conductive film layer. Therefore, the thickness of the cathode film layer should be set thinner, which leads to a larger resistance of the cathode.
  • the voltage drop when the voltage signal is transmitted in the entire cathode film layer is relatively large, that is, IR-Drop.
  • an auxiliary electrode is provided in the display panel.
  • the auxiliary electrode is in the shape of a metal wire or a metal grid.
  • the IR voltage drop is reduced.
  • One arrangement is to arrange an auxiliary electrode between the anode and the substrate, and arrange a contact hole in the insulating film layer between the auxiliary electrode and the cathode, so that the cathode is electrically connected to the auxiliary electrode through the contact hole.
  • the display substrate 100' has a plurality of pixel regions P', and each pixel region P'has a blue sub-pixel 124', a green sub-pixel 125', and a red sub-pixel 126'.
  • each pixel region P' has a blue sub-pixel 124', a green sub-pixel 125', and a red sub-pixel 126'.
  • the display substrate 100' is provided with a storage tank layer, the storage tank layer has a plurality of storage tanks, and the light-emitting layer of each sub-pixel is arranged in one storage tank; the contact hole 122' penetrates the storage tank layer.
  • the display substrate 100 has a plurality of pixel regions P.
  • the “pixel area P” refers to the area where a pixel in the display substrate 100 is located; wherein, a pixel is a minimum sub-pixel repeating unit group formed by a plurality of sub-pixels; that is, the display substrate 100 It includes a plurality of pixels, and each pixel includes a plurality of sub-pixels, and the number, size, color, and arrangement of the sub-pixels included in each pixel are the same. For example, each pixel includes a red sub-pixel, a green sub-pixel, and a blue sub-pixel.
  • the sub-pixels of the same color in each pixel have the same size, and the arrangement of multiple sub-pixels in each pixel is the same. Therefore, the one red sub-pixel
  • the pixels, one green sub-pixel, and one blue sub-pixel form a minimum sub-pixel repeating unit group, and the area where the minimum sub-pixel repeating unit group is located is a pixel area P.
  • the display substrate 100 includes a substrate 140 and a reservoir layer 120 disposed on the substrate 140.
  • the part of the reservoir layer 120 located in each pixel region P is provided with a contact hole 122 and a plurality of reservoirs 123.
  • the multiple reservoirs 123 are located on the periphery of the contact hole 122, and each reservoir 123 is spaced from the contact hole 122. .
  • a plurality of reservoirs 123 and contact holes 122 penetrate the reservoir layer 120.
  • the display substrate 100 further includes a light-emitting layer 121 disposed in each reservoir 123.
  • a light-emitting layer 121 disposed in each reservoir 123.
  • IJP ink-jet printing
  • the display substrate 100 further includes an electrical connection structure disposed on the substrate 140, and a part of the electrical connection structure passes through the contact hole 122.
  • the electrical connection structure includes an auxiliary electrode 150 disposed between the substrate 140 and the reservoir layer 120, and a cathode layer 110 disposed on the side of the reservoir layer 120 and the light-emitting layer 121 away from the substrate 140.
  • the auxiliary electrode 150 is located on the side of the contact hole 122 close to the substrate 140. At least a part of the cathode layer 110 sinks into the contact hole 122 so that the cathode layer 110 and the auxiliary electrode 150 are electrically connected through the contact hole 122.
  • an evaporation process can be used to prepare the cathode layer 110.
  • the material of the cathode layer 110 may include metal or transparent conductive oxide (Transparent Conductive Oxide, TCO for short), or a combination of the two.
  • the impedance of the cathode layer 110 can be reduced, thereby avoiding a large voltage drop (ie, IR voltage drop) generated by the current flowing through the cathode layer 110.
  • the display substrate 100 further includes an anode 130 disposed between the substrate 140 and the light-emitting layer 121, and a pixel circuit T disposed between the anode 130 and the substrate 140, and the pixel circuit T is electrically connected to the anode 130.
  • the pixel circuit T transmits a voltage signal to the anode 130, and the anode 130 and the cathode layer 110 with voltage form an electric field, thereby exciting the light-emitting layer 121 located between the anode 130 and the cathode layer 110 to emit light.
  • the position with the smallest distance from the wall surface of the at least one reservoir 123 located on the periphery of the contact hole 122 is the first position.
  • Point 1221 That is, the minimum distance between the first position point 1221 and the wall surface of the at least one storage tank 123 is the first distance d1, and the minimum distance between the other position points of the contact hole 122 and the wall surface of the at least one storage tank 123 is the second distance.
  • Distance, the first distance d1 is always smaller than the second distance.
  • the orthographic projection of the contact hole 122 and the plurality of reservoirs 123 on the substrate 140 is a polygonal or approximately polygonal shape
  • the first position point 1221 is not located at the corner of the polygonal or approximately polygonal
  • the contact hole 122 is away from the reservoir 123
  • the nearest side A is not parallel to the side B near the contact hole 122 in the storage tank 123.
  • FIG. 5 another distribution map of the reservoir 123' and the contact hole 122' in the reservoir layer is provided.
  • the distance between the first position point 1221' and the wall surface of at least one reservoir 123' located on the periphery of the contact hole 122' is the smallest, and the smallest distance is d2 .
  • the area of the orthographic projection of the reservoir 123' and the contact hole 122' on the substrate that is, the opening area of the reservoir 123' is the same as the opening area of the reservoir 123 in the embodiment of the present disclosure, and the opening area of the contact hole 122'
  • the opening area of the contact hole 122 is the same as that of the embodiment of the present disclosure, and the distance between the center of the reservoir 123' and the center of the contact hole 122' is the same as that of the center of the reservoir 123 and the contact hole 122 in the embodiment of the present disclosure.
  • the distances between the centers of are the same.
  • the first distance d1 in the embodiment of the present disclosure is greater than the minimum distance d2.
  • the orthographic projection of the contact hole 122 on the substrate 140 is a polygon or approximately a polygon, so that the first position point is not located at the corner of the polygon.
  • the minimum distance between the storage tank 123 and the contact hole 122 can be increased, that is, the first distance d1 is increased to prevent the ink overflow into the contact hole 122 when the light-emitting layer 121 is printed in the storage tank 123, causing the cathode layer 110 and the auxiliary The electrode 150 is in poor contact.
  • the opening area of the storage tank 123 can be appropriately increased, thereby increasing the opening ratio of the display substrate 100 and improving the display effect of the display panel.
  • one side of the orthographic projection of the contact hole 122 on the substrate 140 is directly opposite to the corner of the orthographic projection of a reservoir 123 located on the periphery of the contact hole 122 on the substrate 140. , And the first position point 1221 is located on this side.
  • the orthographic projection of the contact hole 122 on the substrate 140 is a polygon, and the corner of the polygon is directly opposite to the corner of the orthographic projection of a reservoir 123 located on the periphery of the contact hole 122 on the substrate 140.
  • the first position point 1221 is located at the corner of the polygon.
  • One side of the orthographic projection is directly opposite to the corner of the orthographic projection of a reservoir 123 located on the periphery of the contact hole 122 on the substrate 140, and the first position point 1221 is located on this side, which increases the contact between the reservoir 123 and the substrate 140.
  • the minimum distance between the holes 122 is to prevent the ink from overflowing into the contact holes 122 when printing the light-emitting layer 121 in the storage tank 123, causing poor contact between the cathode layer 110 and the auxiliary electrode 150.
  • the corners of the orthographic projection of the reservoir 123 on the substrate 140 are rounded corners, which is beneficial to improve the drying uniformity of the ink used to print the light-emitting layer 121.
  • the tangent line 1231 at the bisecting point 1232 of the rounded boundary of the contact hole 122 opposite the reservoir 123 is in contact with
  • the sides A of the hole 122 facing the tank 123 are parallel to each other.
  • the first distance d1 is the distance between the tangent line 1231 and the side A of the contact hole 122 facing the tank 123.
  • the minimum distance between the first position point 1221 and the wall surface of the storage tank 123 can be further increased, that is, the first distance d1 can be increased.
  • the sides of the contact hole 122 are respectively aligned with The corners of the plurality of tanks 123 located on the periphery of the contact hole 122 are directly opposite.
  • a plurality of storage tanks 123 are distributed around the contact holes 122, so that the arrangement of the storage tanks 123 and the contact holes 122 on the storage tank layer 120 is more compact.
  • the above arrangement can increase the number of reservoirs 123 on the reservoir layer 120, which is beneficial to increase the aperture ratio of the display substrate 100.
  • the orthographic projection of the contact hole 122 on the substrate 140 is a rectangle.
  • Four storage grooves 123 are arranged in one pixel area P, and the four sides of the rectangular orthographic projection of the contact hole 122 are respectively directly opposite to the corners of the four storage grooves 123 located on the periphery of the contact hole 122.
  • the contact hole 122 is located at the center position C of the rectangle D formed by connecting the centers of the four storage tanks 123 sequentially.
  • the areas of the orthographic projection of the four storage tanks 123 on the substrate 140 are the same, that is, the opening areas of the four storage tanks 123 are the same.
  • the exposed area of the ink of the luminescent material in the four storage tanks 123 is the same, in the same dry environment
  • the time for the ink of the luminescent material to dry and form a film is approximately the same, which is beneficial to improve the thickness uniformity of the formed luminescent layer 121.
  • the ink material used in the light emitting layer that emits blue light has a shorter service life than the ink material used in the light emitting layer that emits red light and green light.
  • the numbers of blue sub-pixels 1241, green sub-pixels 1251 and red sub-pixels 1261 in each pixel region 101 are the same.
  • the area of the blue sub-pixel 1241 and the green sub-pixel 1251 are the same.
  • the area of the red sub-pixel 1261 is slightly smaller than that of the blue sub-pixel 1241 and the green sub-pixel 1251.
  • the difference between the areas of the blue sub-pixel 1241 and the red sub-pixel 1261 is not enough to eliminate the problem of color shift in the display screen of the display panel caused by the difference in the life of the ink materials of the two.
  • the light-emitting layer 121 provided in the two storage grooves 123 is capable of emitting light.
  • the light-emitting layer of blue light (see the blue sub-pixel 124 in FIG. 8), and the light-emitting layers 121 provided in the remaining two storage tanks 123 are respectively light-emitting layers capable of emitting red light (see the red sub-pixel 126 in FIG. 8) And a light-emitting layer 121 capable of emitting green light (see the green sub-pixel 125 in FIG. 8).
  • the life span of the blue sub-pixel is 1 as the unit.
  • the ratio of the life span of the red sub-pixel 1261 and the blue sub-pixel 1241 is as high as 12.
  • the blue sub-pixels in one pixel area P The total area of 124 is increased; when the areas of one red sub-pixel 1261, one green sub-pixel 125 and one blue sub-pixel 1241 are the same, the total area of the blue sub-pixel 124 in one pixel region P is the red sub-pixel 126. Twice the area of the green sub-pixel 125.
  • the difference between the attenuation speeds of the blue sub-pixel 124, the red sub-pixel 126 and the green sub-pixel 125 in one pixel area P is reduced, and the ratio of the service life of the red sub-pixel 126 and the blue sub-pixel 124 is reduced.
  • the service life of the blue sub-pixel 124 in one pixel area P is increased, and the problem of the color shift of the display panel caused by the large difference in the attenuation speed of the sub-pixels is improved.
  • R refers to the total area of the red sub-pixels 126 in a pixel area P
  • G refers to the total area of the green sub-pixels 125 in a pixel region P;
  • B refers to the total area of the two blue sub-pixels 124 in one pixel area P;
  • the “comprehensive aperture ratio” refers to the ratio of the total area of the red sub-pixel 126, the green sub-pixel 125, and the two blue sub-pixels 124 in one pixel region P to the total area of the pixel region P.
  • the multiple sides of the contact hole 122 and the multiple sides located at the periphery of the contact hole 122 are respectively
  • the corners of the storage tanks 123 are directly opposite, that is, a plurality of storage tanks 123 are distributed around the contact holes 122. This arrangement increases the overall aperture ratio of the display substrate 100, thereby helping to improve the display quality of the display panel.
  • three reservoirs 123 are provided in one pixel area P, and three of the four sides of the rectangular orthographic projection of the contact hole 122 are respectively connected to the three reservoirs located on the periphery of the contact hole 122.
  • the corner of the groove 123 is directly opposite.
  • three storage tanks 123 are arranged around the contact hole 122.
  • one of the storage tanks 123 is the first storage tank 123a, and the light-emitting tank 123a is provided in the first storage tank 123a.
  • the layer 121 is a light-emitting layer 121 capable of emitting blue light
  • the remaining two storage tanks 123 are second storage tanks 123b
  • the light-emitting layers 121 provided in the two second storage tanks 123b are respectively a light-emitting layer 121 capable of emitting red light and a light-emitting layer 121 capable of emitting red light.
  • the light emitting layer 121 emits green light.
  • the area of the orthographic projection of the first reservoir 123a on the substrate 140 is larger than the area of the orthographic projection of each second reservoir 123b on the substrate 140.
  • the difference between the attenuation speeds of the blue sub-pixel 124 and the red sub-pixel 126 and the green sub-pixel 125 can be reduced, and the service life of the blue sub-pixel 124 can be increased.
  • the ratio of the area of the orthographic projection of the first reservoir 123a on the substrate 140 to the area of the orthographic projection of each second reservoir 123b on the substrate 140 is greater than or equal to 1.5, and less than or Equal to 6. That is, the ratio of the area of the blue sub-pixel 124 to the areas of the red sub-pixel 126 and the green sub-pixel 125 is greater than or equal to 1.5 and less than or equal to 6. For example, it is 1.5, 2, 2.5, 3, 5, or 6 times.
  • the inventor’s research found that when the ratio of the area of the blue sub-pixel 124 to the area of the red sub-pixel 126 and the green sub-pixel 125 is within the above range, the attenuation speed of the blue sub-pixel 124 can be reduced, and the blue sub-pixel 124 can be increased.
  • the service life of the sub-pixel 124 improves the color shift of the display panel.
  • Some embodiments of the present disclosure also provide a display panel 300, as shown in FIG. 10, including the display substrate 100 of any of the above-mentioned embodiments, and a photoresist cover 200 superimposed on the display substrate 100.
  • the photoresist cover 200 includes a plurality of color filter photoresists 201, and each color filter photoresist 201 is arranged opposite to a storage groove 123 of the display substrate 100.
  • the color filter photoresist 201 can filter the light emitted by the display substrate 100, so that the display panel 300 has a good light-emitting effect.
  • the light emitting layer 121 provided in at least two of the storage grooves 123 is a light emitting layer 121 capable of emitting blue light.
  • the color filter photoresist 201 in the photoresist cover 200 opposite to the light emitting layer 121 capable of emitting blue light is a blue photoresist, and the blue photoresist corresponding to different light emitting layers 121 capable of emitting blue light in the same pixel area P, so The wavelength range of the blue light that can be transmitted is different, or the peak of the blue light spectrum that can be transmitted is different.
  • the light-emitting layers 121 provided in the two storage tanks 123 are light-emitting layers 121 capable of emitting blue light
  • the blue photoresist corresponding to one of the light-emitting layers 121 capable of emitting blue light is the first blue photoresist, and the other one is capable of emitting blue light.
  • the blue photoresist corresponding to the blue light emitting layer 121 is the second blue photoresist.
  • the blue light wavelength range that the first blue photoresist can transmit is different from the blue light wavelength range that the second blue photoresist can transmit, so that the blue sub-pixels corresponding to the first blue photoresist display light blue, and the second blue photoresist
  • the blue sub-pixel corresponding to the color photoresist displays dark blue.
  • the peak of the blue light spectrum that the first blue photoresist can transmit is different from the peak of the blue light spectrum that the second blue photoresist can transmit.
  • one of the peaks is 430nm and the other is 460nm, so that the first One of the blue sub-pixels corresponding to the one blue photoresist and the second blue photoresist displays light blue, and the other displays dark blue.
  • the blue wavelength range that the first blue photoresist can transmit and the blue wavelength range that the second blue photoresist can transmit may be the same.
  • the blue light emitted by at least two blue sub-pixels in the display substrate 100 can be displayed with different shades of blue light after passing through the corresponding blue photoresist, such as darker blue light and lighter blue light, so that The color gamut of the display screen of the display panel 300 is increased.
  • a certain shade of blue light can be selected, that is, the blue sub-pixel corresponding to the corresponding blue photoresist is turned on, and the other blue sub-pixel is turned off, so that the display panel can be reduced 300 shows the power consumption.
  • the photoresist cover 200 further includes a black matrix 203 that separates a plurality of color filter photoresists 201 to prevent cross-color between sub-pixels of different colors.
  • the photoresist cover 200 further includes a base substrate 204 on which the multiple color filter photoresists 201 and the black matrix 203 are disposed.
  • the black matrix 203 can be formed on one side of the base substrate 204, and then a plurality of color filter photoresistors 201 can be formed, and then the prepared photoresist cover 200 and the prepared display The substrates 100 are stacked together to form a display panel 300.
  • the display panel 300 further includes an encapsulation film 202 disposed between the display substrate 100 and the photoresist cover 200.
  • the encapsulation film 202 includes at least an inorganic encapsulation film.
  • the inorganic packaging film may be used for the preparation of the inorganic packaging film, so that the inorganic packaging film is covered on the display substrate 100 to protect the display substrate 100. effect.
  • the material of the inorganic packaging film may include silicon nitride (SiN x ), silicon oxynitride (SiON x ), etc., and its thickness may range from 0.3 ⁇ m to 1 ⁇ m, such as 0.3 ⁇ m, 0.5 ⁇ m, 0.8 ⁇ m, or 1 ⁇ m.
  • the encapsulation film 202 may also include an organic encapsulation film laminated with an inorganic encapsulation film.
  • the encapsulation film 202 includes both an inorganic encapsulation film and an organic encapsulation film, along the direction perpendicular to the display surface of the display panel 300, the encapsulation film 202 includes an inorganic encapsulation film, an organic encapsulation film, and an inorganic encapsulation film in sequence.
  • Some embodiments of the present disclosure also provide a display device 400, including the display panel 300 in the above-mentioned embodiments.
  • the display device 400 may be an electroluminescence display device, and the electroluminescence display device includes a display panel 300 and a polarizer 401 attached to the display panel 300.
  • the use of the polarizer 401 can reduce the reflection of natural light by the reflective structures (such as anodes, thin film transistors, metal signal lines, etc.) in the display device 400, thereby preventing the reflection of natural light from interfering with the display effect of the display device 400.
  • the above-mentioned display device 400 may be any device that displays images, whether in motion (for example, video) or fixed (for example, still images), and regardless of text or images. More specifically, it is expected that the described embodiments can be implemented in or associated with a variety of electronic devices, such as (but not limited to) mobile phones, wireless devices, and personal data assistants (PDAs).
  • PDAs personal data assistants
  • Handheld or portable computers GPS receivers/navigators, cameras, MP4 video players, camcorders, game consoles, watches, clocks, calculators, TV monitors, flat panel displays, computer monitors, car monitors (e.g., Odometer display, etc.), navigator, cockpit controller and/or display, camera view display (for example, the display of a rear-view camera in a vehicle), electronic photos, electronic billboards or signs, projectors, building structures, packaging And aesthetic structure (for example, a display of the image of a piece of jewelry), etc.

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Abstract

一种显示基板，具有多个像素区域。显示基板包括衬底、设置于衬底上的储槽层、设置于所述衬底上的电连接结构、以及设置于每个储槽中的发光层。储槽层开设有接触孔和多个储槽，多个储槽位于接触孔的周边，且每个储槽与接触孔间隔设置。沿垂直于衬底的方向，多个储槽和接触孔贯穿储槽层。所述电连接结构的一部分穿过所述接触孔。其中，接触孔在衬底上的正投影的边界的各位置点中，与位于接触孔周边的至少一个储槽的壁面之间距离最小的位置点为第一位置点。接触孔和多个储槽在衬底上的正投影为多边形或近似多边形，第一位置点不位于该多边形或近似多边形的拐角处，且接触孔中距离储槽最近的边，与储槽中靠近接触孔的边均不平行。

Description

显示基板、显示面板及显示设备
本申请要求于2019年09月30日提交的、申请号为201910944276.8的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本公开涉及显示技术领域，尤其涉及一种显示基板、显示面板及显示设备。
背景技术
打印有机电致发光(Printed OLED)显示面板的制备不需要采用高精度金属掩模版(Fine Metal Mask，简称FMM)或其它构图工艺，具有高材料利用率、高效率、易于大面积制备及全色显示等特点，逐渐成为应用于大尺寸的显示面板的主流技术之一，得到人们广泛的关注。
公开内容
一方面，提供一种显示基板，具有多个像素区域。所述显示基板包括衬底、设置于所述衬底上的储槽层、设置于所述衬底上的电连接结构、以及设置于每个所述储槽中的发光层。所述储槽层开设有接触孔和多个储槽，所述多个储槽位于所述接触孔的周边，且每个储槽与所述接触孔间隔设置。沿垂直于所述衬底的方向，所述多个储槽和所述接触孔贯穿所述储槽层。所述电连接结构的一部分穿过所述接触孔。
其中，所述接触孔在所述衬底上的正投影的边界的各位置点中，与位于所述接触孔周边的至少一个储槽的壁面之间距离最小的位置点为第一位置点。所述接触孔和所述多个储槽在所述衬底上的正投影为多边形或近似多边形，所述第一位置点不位于该多边形或所述近似多边形的拐角处，且所述接触孔中距离所述储槽最近的边，与所述储槽中靠近所述接触孔的边均不平行。
在一些实施例中，所述接触孔在所述衬底上的正投影的一条边，与位于所述接触孔周边的一个储槽在所述衬底上的正投影的拐角正对，且所述第一位置点位于这条边上。
在一些实施例中，所述储槽在所述衬底上的正投影的拐角为圆角。在所述接触孔及其正对的储槽在所述衬底上的正投影中，所述储槽正对的所述接触孔的圆角边界的平分点处的切线，与所述接触孔的正对所述储槽的边相互平行。
在一些实施例中，在一个所述像素区域内，所述接触孔和所述多个储槽在所述衬底上的正投影中，所述接触孔的多条边分别与位于所述接触孔周边 的所述多个储槽的拐角正对。
在一些实施例中，所述接触孔在所述衬底上的正投影为矩形。一个所述像素区域内设置有四个所述储槽，所述接触孔的矩形正投影的四条边分别与位于所述接触孔周边的四个所述储槽的拐角正对。或者，一个所述像素区域内设置有三个所述储槽，所述接触孔的矩形正投影的四条边中的三条边分别与位于所述接触孔周边的三个所述储槽的拐角正对。
在一些实施例中，一个所述像素区域内设置有四个所述储槽。其中两个所述储槽中所设置的发光层为能够发射蓝光的发光层，其余两个所述储槽中所设置的发光层分别为能够发射红光的发光层和能够发射绿光的发光层。
在一些实施例中，所述接触孔位于四个所述储槽的中心依次连线所形成的矩形的中心位置。
在一些实施例中，四个所述储槽在所述衬底上的正投影的面积相同。
在一些实施例中，一个所述像素区域内设置有三个所述储槽。其中一个所述储槽为第一储槽，所述第一储槽中所设置的发光层为能够发射蓝光的发光层，其余两个所述储槽为第二储槽，两个所述第二储槽中所设置的发光层分别为能够发射红光的发光层和能够发射绿光的发光层。所述第一储槽在所述衬底上的正投影的面积大于每个所述第二储槽在所述衬底上的正投影的面积。
在一些实施例中，三个所述储槽围绕所述接触孔设置。
在一些实施例中，所述第一储槽在所述衬底上的正投影的面积与每个所述第二储槽在所述衬底上的正投影的面积的比值，大于或等于1.5，且小于或等于6。
在一些实施例中，所述电连接结构包括设置于所述衬底与所述储槽层之间的辅助电极，以及设置于所述储槽层和所述发光层远离所述衬底的一侧的阴极层。所述辅助电极位于所述接触孔的靠近所述衬底的一侧，所述阴极层的至少一部分陷入接触孔中，以使所述阴极层和所述辅助电极通过所述接触孔电连接。
在一些实施例中，所述显示基板还包括设置于所述衬底与所述发光层之间的阳极，以及设置于所述阳极与所述衬底的像素电路。所述像素电路与所述阳极电连接。
另一方面，提供一种显示面板，包括以上实施例所述的显示基板，以及与所述显示基板叠加设置的光阻盖板。所述光阻盖板包括多个彩色滤光光阻，每个彩色滤光光阻与所述显示基板的一个所述储槽相对设置。
在一些实施例中，在所述显示基板的每个像素区域内的多个储槽中，至少两个储槽中所设置的发光层为能够发蓝光的发光层。所述光阻盖板中与所述能够发蓝光的发光层相对设置的彩色滤光光阻为蓝色光阻，同一像素区域内不同的能够发蓝光的发光层所对应的蓝色光阻，所能透过的蓝光波长范围不相同，或者所能透过的蓝光光谱的峰值不同。
另一方面，提供一种显示设备，包括以上实施例所述的显示面板。
附图说明
为了更清楚地说明本公开中的技术方案，下面将对本公开一些实施例中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本公开的一些实施例的附图，对于本领域普通技术人员来讲，还可以根据这些附图获得其他的附图。此外，以下描述中的附图可以视作示意图，并非对本公开实施例所涉及的产品的实际尺寸、方法的实际流程、信号的实际时序等的限制。
图1为相关技术的显示基板的俯视图；
图2为根据本公开的一些实施例的一种显示基板的俯视图；
图3为图2中沿剖面线O-O＇的剖面图；
图4为图2中的显示基板的像素区域的局部放大图；
图5为相关技术的显示基板的像素区域的俯视图；
图6为根据本公开的一些实施例的另一种显示基板的俯视图；
图7为图6中的显示基板的像素区域的局部放大图；
图8为根据本公开的一些实施例的一种显示基板的像素分布图；
图9为根据本公开的一些实施例的又一种显示基板的俯视图；
图10为根据本公开的一些实施例的显示面板的结构图；
图11为根据本公开的一些实施例的显示设备的结构图。
具体实施方式
下面将结合附图，对本公开一些实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本公开一部分实施例，而不是全部的实施例。基于本公开所提供的实施例，本领域普通技术人员所获得的所有其他实施例，都属于本公开保护的范围。
除非上下文另有要求，否则，在整个说明书和权利要求书中，术语“包括(comprise)”及其其他形式例如第三人称单数形式“包括(comprises)”和现在分词形式“包括(comprising)”被解释为开放、包含的意思，即为“包含，但不限于”。在说明书的描述中，术语“一个实施例(one embodiment)”、“一些 实施例(some embodiments)”、“示例性实施例(exemplary embodiments)”、“示例(example)”、“特定示例(specific example)”或“一些示例(some examples)”等旨在表明与该实施例或示例相关的特定特征、结构、材料或特性包括在本公开的至少一个实施例或示例中。上述术语的示意性表示不一定是指同一实施例或示例。此外，所述的特定特征、结构、材料或特点可以以任何适当方式包括在任何一个或多个实施例或示例中。
以下，术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括一个或者更多个该特征。在本公开实施例的描述中，除非另有说明，“多个”的含义是两个或两个以上。
如本文所使用的那样，“近似”包括所阐述的值以及处于特定值的可接受偏差范围内的平均值，其中所述可接受偏差范围如由本领域普通技术人员考虑到正在讨论的测量以及与特定量的测量相关的误差(即，测量系统的局限性)所确定。
在相关技术中，OLED显示面板包括衬底，以及设置于衬底上的多个子像素，每个子像素依次设置于衬底上的像素电路、阳极、发光层和阴极，多个子像素的阴极相互连通形成整面覆盖的膜层。对于顶发射的OLED显示面板，发光层发出的光线从阴极出射，阴极需要设置成透明或半透明的导电膜层，因此阴极的膜层厚度要设置得薄，这导致阴极的电阻较大，阴极电压信号在整面的阴极膜层中传输时的压降较大，即IR压降(IR-Drop)。
为了减小阴极信号在传输时的压降，会在显示面板中设置辅助电极，辅助电极为金属线或者金属网格状，通过将多个子像素的阴极与辅助电极并联，来减小IR压降。一种设置方式为，在阳极与衬底之间设置辅助电极，在辅助电极与阴极之间的绝缘膜层中设置接触孔，使阴极通过接触孔与辅助电极电连接。
如图1所示，显示基板100＇具有多个像素区域P＇，每个像素区域P＇内具有一个蓝色子像素124＇、一个绿色子像素125＇和一个红色子像素126＇。沿多个像素区域101＇排列的列方向Y，相邻两个红色子像素126＇之间具有用于电连接子像素的阴极与辅助电极的接触孔122＇。显示基板100＇中设置有储槽层，储槽层具有多个储槽，每个子像素的发光层设置于一个储槽中；接触孔122＇贯穿储槽层。
对于采用打印工艺制备发光层的显示基板，接触孔122＇与相邻的红色子像素126＇之间需要具有足够长的距离，以避免在储槽中打印发光层时墨水溢 流至接触孔122＇中，而导致阴极与辅助电极的接触不良，但是这也导致了显示基板100的开口率降低，影响显示基板100的显示效果。
本公开的一些实施例提供了一种显示基板，如图2～图4所示，显示基板100具有多个像素区域P。需要说明的是，在本文中，“像素区域P”是指，显示基板100中一个像素所在的区域；其中，一个像素为由多个子像素形成的一个最小子像素重复单元组；即显示基板100包括多个像素，每个像素包括多个子像素，且各个像素中所包括的子像素个数、大小、颜色、排布相同。例如，每个像素包括一个红色子像素、一个绿色子像素和一个蓝色子像素，各个像素中相同颜色的子像素的大小相同，各个像素中多个子像素的排布相同，因此该一个红色子像素、一个绿色子像素和一个蓝色子像素形成一个最小子像素重复单元组，该最小子像素重复单元组所在的区域为一个像素区域P。
显示基板100包括衬底140，以及设置于衬底140上的储槽层120。储槽层120中位于每个像素区域P内的部分开设有接触孔122和多个储槽123，多个储槽123位于接触孔122的周边，且每个储槽123与接触孔122间隔设置。沿垂直于衬底的方向a，多个储槽123和接触孔122贯穿储槽层120。
显示基板100还包括设置于每个储槽123中的发光层121。通过采用喷墨打印(Ink-jet printing，简称IJP)工艺，将发光材料的墨水打印至储槽123中，墨水干燥后形成发光层121。
显示基板100还包括设置于衬底140上的电连接结构，电连接结构的一部分穿过接触孔122。
示例性的，电连接结构包括设置于衬底140与储槽层120之间的辅助电极150，以及设置于储槽层120和发光层121远离衬底140的一侧的阴极层110。其中，辅助电极150位于接触孔122的靠近衬底140的一侧。阴极层110的至少一部分陷入接触孔122中，以使阴极层110和辅助电极150通过接触孔122电连接。
示例性的，可采用蒸镀制程，制备阴极层110。阴极层110的材料可包括金属或透明导电氧化物(Transparent Conductive Oxide，简称TCO)，或是两者的结合。
通过将阴极层110和辅助电极150电连接，可减小阴极层110的阻抗，从而避免电流流阴极层110产生较大的压降(即IR压降)。
显示基板100还包括设置于衬底140与发光层121之间的阳极130，以及设置于阳极130与衬底140之间的像素电路T，像素电路T与阳极130电连接。
通过像素电路T传输电压信号给阳极130，阳极130与带有电压的阴极层110形成电场，从而激发位于阳极130和阴极层110之间的发光层121发光。
如图4所示，接触孔122在衬底140上的正投影的边界的各位置点中，与位于接触孔122周边的至少一个储槽123的壁面之间距离最小的位置点为第一位置点1221。也即，第一位置点1221与至少一个储槽123的壁面之间的最小距离为第一距离d1，接触孔122的其它位置点与至少一个储槽123的壁面之间的最小距离为第二距离，第一距离d1总是小于第二距离。并且，接触孔122和多个储槽123在衬底140上的正投影为多边形或近似多边形，第一位置点1221不位于该多边形或近似多边形的拐角处，且接触孔122中距离储槽123最近的边A，与储槽123中靠近接触孔122的边B均不平行。
在相关技术中，如图5所示，提供另一种储槽层中的储槽123＇和接触孔122＇的分布图。接触孔122＇在衬底上的正投影的边界的各位置点中，第一位置点1221＇与位于接触孔122＇周边的至少一个储槽123＇的壁面之间距离最小，最小距离为d2。储槽123＇和接触孔122＇在衬底上的正投影的面积，即储槽123＇的开口面积与本公开的实施例中的储槽123的开口面积相同，接触孔122＇的开口面积与本公开的实施例中的接触孔122的开口面积相同，且储槽123＇的中心与接触孔122＇的中心的距离，与本公开的实施例中的储槽123的中心与接触孔122的中心的距离相同，在此情况下，本公开的实施例中的第一距离d1大于最小距离d2。
本公开的上述实施例，通过改变储槽123和接触孔122的相对位置关系，即接触孔122在衬底140上的正投影为多边形或近似多边形，使第一位置点不位于该多边形的拐角处，且接触孔122中距离储槽123最近的边A，与储槽123中靠近接触孔122的边B均不平行，从而在储槽123与接触孔122的中心的距离不变的情况下，可增大储槽123与接触孔122之间的最小距离，即增大第一距离d1，避免在储槽123中打印发光层121时墨水溢流至接触孔122中导致阴极层110与辅助电极150的接触不良。同时，在保证打印发光层121时墨水不会溢流至接触孔122内的前提下，可适当增大储槽123的开口面积，从而提高显示基板100的开口率，以提高显示面板的显示效果。
在一些实施例中，如图4所示，接触孔122在衬底140上的正投影的一条边，与位于接触孔122周边的一个储槽123在衬底140上的正投影的拐角正对，且第一位置点1221位于这条边上。
参考图5，在相关技术中，接触孔122在衬底140上的正投影为多边形，该多边形的拐角与位于接触孔122周边的一个储槽123在衬底140上的正投 影的拐角正对，使第一位置点1221位于该多边形的拐角处。本公开的上述实施例，在储槽123和接触孔122的开口面积不变，且储槽123与接触孔122的中心的距离不变的情况下，通过使接触孔122在衬底140上的正投影的一条边，与位于接触孔122周边的一个储槽123在衬底140上的正投影的拐角正对，且第一位置点1221位于这条边上，增大了储槽123与接触孔122之间的最小距离，从而避免在储槽123中打印发光层121时墨水溢流至接触孔122中导致阴极层110与辅助电极150的接触不良。
在一些实施例中，如图6和图7所示，储槽123在衬底140上的正投影的拐角为圆角，有利于提高打印发光层121所用墨水的干燥均匀性。
再次基础上，在接触孔122及其正对的储槽123在衬底140上的正投影中，储槽123正对的接触孔122的圆角边界的平分点1232处的切线1231，与接触孔122的正对储槽123的边A相互平行。在此情况下，第一距离d1即为切线1231与接触孔122的正对储槽123的边A之间的距离。
通过上述设置方式，可进一步增大第一位置点1221与储槽123的壁面之间的最小距离，即增大第一距离d1。
在一些实施例中，如图4和图7所示，在一个像素区域P内，接触孔122和多个储槽123在衬底140上的正投影中，接触孔122的多条边分别与位于接触孔122周边的多个储槽123的拐角正对。
通过上述设置方式，多个储槽123围绕接触孔122分布，使储槽123和接触孔122在储槽层120上的排布更加紧凑。在储槽层120所占据的衬底的面积不变的情况下，上述排布方式可提高在储槽层120上开设储槽123的数量，有利于提高显示基板100的开口率。
在一些实施例中，如图4和图7所示，接触孔122在衬底140上的正投影为矩形。一个像素区域P内设置有四个储槽123，接触孔122的矩形正投影的四条边分别与位于接触孔122周边的四个储槽123的拐角正对。
示例性的，接触孔122位于四个储槽123的中心依次连线所形成的矩形D的中心位置C。
在一些实施例中，四个储槽123在衬底140上的正投影的面积相同，即四个储槽123的开口面积相同。在将发光材料的墨水打印至储槽123内后，由于四个储槽123的开口面积相同，因此四个储槽123内的发光材料的墨水所暴露的面积是相同的，在相同的干燥环境下，发光材料的墨水干燥成膜的时间是大致相同的，从而有利于提高所形成的发光层121的厚度均一性。
在相关技术中，相较于发射红光和绿光的发光层所采用的墨水材料，发 射蓝光的发光层所采用的墨水材料的使用寿命较短。如图1所示，每一像素区域101中的蓝色子像素1241、绿色子像素1251和红色子像素1261的个数相同。并且，蓝色子像素1241和绿色子像素1251的面积相同，为避让接触孔122，为接触孔122提供设置空间，红色子像素1261的面积略小于蓝色子像素1241和绿色子像素1251的面积，但是蓝色子像素1241与红色子像素1261的面积的差值不足以消除因两者的墨水材料寿命的差异而导致显示面板的显示画面产生色偏的问题。
为解决上述问题，在一些实施例中，如图8所示，在一个像素区域P内设置有四个储槽123的情况下，其中两个储槽123中所设置的发光层121为能够发射蓝光的发光层(参见图8中的蓝色子像素124)，其余两个储槽123中所设置的发光层121分别为能够发射红光的发光层(参见图8中的红色子像素126)和能够发射绿光的发光层121(参见图8中的绿色子像素125)。
参考图1和图8的像素分布，测试一个像素区域P内不同颜色子像素的使用寿命，得到如下表1的测试结果：
表1
Figure PCTCN2020119278-appb-000001
在上表中，以蓝色子像素的使用寿命为单位1。
由上表可知，在相关技术中，红色子像素1261与蓝色子像素1241的寿命的比值高达12。而本公开的实施例中，通过增加蓝色子像素124的个数(需要增加设置有能够发射蓝光的发光层121的储槽123的个数)，使一个像素区域P内的蓝色子像素124的总面积增加；在一个红色子像素1261、一个绿色子像素125和一个蓝色子像素1241的面积相同的情况下，一个像素区域P内的蓝色子像素124的总面积是红色子像素126、绿色子像素125的面积的两倍。从而缩小了一个像素区域P内蓝色子像素124与红色子像素126和绿色子像素125的衰减速度之间的差值，使红色子像素126与蓝色子像素124的使用寿命的比值降至5.1，提高了一个像素区域P内蓝色子像素124的使用寿命，进而改善了由子像素衰减速度差异太大而导致的显示面板产生色偏的问题。
此外，参考图1和图6，在像素区域P的尺寸为157μm×157μm的情况下，计算显示基板100的综合开口率，如下表1所示：
表1
Figure PCTCN2020119278-appb-000002
表中，“R”是指一个像素区域P内的红色子像素126的总面积；
“G”是指一个像素区域P内的绿色子像素125的总面积；
“B”是指一个像素区域P内的两个蓝色子像素124的总面积；
“综合开口率”是指一个像素区域P内的红色子像素126、绿色子像素125和两个蓝色子像素124的面积总和与像素区域P的总面积的比值。
可见，本公开的实施例，在一个像素区域P内，接触孔122和多个储槽123在衬底140上的正投影中，接触孔122的多条边分别与位于接触孔122周边的多个储槽123的拐角正对，即多个储槽123围绕接触孔122分布，通过这种排布方式使得显示基板100的综合开口率有所提高，从而有利于提高了显示面板的显示质量。
在另一些实施例中，如图9所示，一个像素区域P内设置有三个储槽123，接触孔122的矩形正投影的四条边中的三条边分别与位于接触孔122周边的三个储槽123的拐角正对。
示例性的，三个储槽123围绕接触孔122设置。
在一些实施例中，如图9所示，在一个像素区域P内设置有三个储槽123的情况下，其中一个储槽123为第一储槽123a，第一储槽123a中所设置的发光层121为能够发射蓝光的发光层121，其余两个储槽123为第二储槽123b，两个第二储槽123b中所设置的发光层121分别为能够发射红光的发光层121和能够发射绿光的发光层121。
其中，第一储槽123a在衬底140上的正投影的面积大于每个第二储槽123b在衬底140上的正投影的面积。
通过上述设置方式，可缩小蓝色子像素124与红色子像素126和绿色子像素125的衰减速度之间的差值，提高蓝色子像素124的使用寿命。
在一些实施例中，第一储槽123a在衬底140上的正投影的面积与每个第二储槽123b在衬底140上的正投影的面积的比值，大于或等于1.5，且小于或等于6。即，蓝色子像素124的面积与红色子像素126、绿色子像素125的面积的比值大于等于1.5，并且小于等于6。例如为1.5、2、2.5、3、5或6倍。
经发明人研究发现，在蓝色子像素124的面积与红色子像素126、绿色子 像素125的面积的比值在上述范围内的情况下，可降低蓝色子像素124的衰减速度，提高蓝色子像素124的使用寿命，从而改善显示面板的色偏现象。
本公开的一些实施例还提供了一种显示面板300，如图10所示，包括上述任一实施例的显示基板100，以及与显示基板100叠加设置的光阻盖板200。光阻盖板200包括多个彩色滤光光阻201，每个彩色滤光光阻201与显示基板100的一个储槽123相对设置。彩色滤光光阻201可对显示基板100发出的光线进行过滤，从而使显示面板300具有良好的出光效果。
在一些实施例中，在显示基板100的每个像素区域P内的多个储槽123中，至少两个储槽123中所设置的发光层121为能够发蓝光的发光层121。光阻盖板200中与能够发蓝光的发光层121相对设置的彩色滤光光阻201为蓝色光阻，同一像素区域P内不同的能够发蓝光的发光层121所对应的蓝色光阻，所能透过的蓝光波长范围不同，或者所能透过的蓝光光谱的峰值不同。
例如，两个储槽123中所设置的发光层121为能够发蓝光的发光层121，与其中一个能够发蓝光的发光层121对应的蓝色光阻为第一蓝色光阻，与另外一个能够发蓝光的发光层121对应的蓝色光阻为第二蓝色光阻。第一蓝色光阻所能透过的蓝光波长范围与第二蓝色光阻所能透过的蓝光波长范围不相同，使得第一蓝色光阻对应的蓝色子像素显示浅蓝色，第二蓝色光阻对应的蓝色子像素显示深蓝色。
或者，第一蓝色光阻所能透过的蓝光光谱的峰值与第二蓝色光阻所能透过的蓝光光谱的峰值不同，例如其中一者峰值为430nm，另外一者峰值为460nm，使得第一蓝色光阻和第二蓝色光阻对应的蓝色子像素中的一者显示浅蓝色，另一者显示深蓝色。需要说明的是，在前述情况下，第一蓝色光阻所能透过的蓝光波长范围与第二蓝色光阻所能透过的蓝光波长范围可以是相同的。
通过上述设置方式，使显示基板100中至少两个蓝色子像素发出的蓝光，通过对应的蓝色光阻后显示颜色深浅不同的蓝光，例如颜色较深的蓝光和颜色较浅的蓝光，从而可提高显示面板300显示画面的色域。并且，可根据对显示画面的色域的需求，选择某一种颜色深浅的蓝光，即开启相应蓝色光阻所对应的蓝色子像素，关闭另一个蓝色子像素，这样可减小显示面板300显示的功耗。
在一些实施例中，如图10所示，光阻盖板200还包括黑矩阵203，黑矩阵203将多个彩色滤光光阻201间隔开，以防止不同颜色的子像素之间串色。
在一些实施例中，光阻盖板200还包括衬底基板204，上述多个彩色滤光 光阻201以及黑矩阵203设置于该衬底基板204上。
在显示面板300的制备过程中，可先在衬底基板204的一侧形成黑矩阵203，然后形成多个彩色滤光光阻201，之后将制备好的光阻盖板200与制备好的显示基板100叠加在一起，形成显示面板300。
在一些实施例中，如图10所示，显示面板300还包括设置于显示基板100和光阻盖板200之间的封装膜202。封装膜202至少包括无机封装膜。
示例性的，对于无机封装膜的制备，可采用化学气相沉积法(Chemical Vapor Deposition，简称CVD)形成无机封装膜，使无机封装膜覆盖在显示基板100上，以对显示基板100起到保护的作用。无机封装膜的材料可包括氮化硅(SiN x)、氮氧化硅(SiON x)等，其厚度的范围可为0.3μm～1μm，例如0.3μm、0.5μm、0.8μm或1μm等等。
封装膜202还可包括与无机封装膜层叠设置的有机封装膜。在封装膜202既包括无机封装膜，又包括有机封装膜的情况下，沿垂直于显示面板300的显示面的方向，封装膜202依次包括无机封装膜、有机封装膜和无机封装膜。
本公开的一些实施例还提供了一种显示设备400，包括上述实施例中的显示面板300。
如图11所示，显示设备400可为电致发光显示设备，该电致发光显示设备包括显示面板300，以及粘贴于显示面板300上的偏光片401。利用偏光片401可减少显示设备400中的能够反光的结构(例如阳极、薄膜晶体管、金属信号线等)对自然光的反射，从而避免自然光的反射对显示设备400的显示效果产生干扰。
上述显示设备400可以是显示不论运动(例如，视频)还是固定(例如，静止图像)的且不论文字还是的图像的任何装置。更明确地说，预期所述实施例可实施在多种电子装置中或与多种电子装置关联，所述多种电子装置例如(但不限于)移动电话、无线装置、个人数据助理(PDA)、手持式或便携式计算机、GPS接收器/导航器、相机、MP4视频播放器、摄像机、游戏控制台、手表、时钟、计算器、电视监视器、平板显示器、计算机监视器、汽车显示器(例如，里程表显示器等)、导航仪、座舱控制器和/或显示器、相机视图的显示器(例如，车辆中后视相机的显示器)、电子相片、电子广告牌或指示牌、投影仪、建筑结构、包装和美学结构(例如，对于一件珠宝的图像的显示器)等。
以上所述，仅为本公开的具体实施方式，但本公开的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本公开揭露的技术范围内，想到变化或替换，都应涵盖在本公开的保护范围之内。因此，本公开的保护范围应 以所述权利要求的保护范围为准。

Claims (16)

  1. 一种显示基板，具有多个像素区域；所述显示基板包括：
    衬底；
    设置于所述衬底上的储槽层；所述储槽层开设有接触孔和多个储槽，所述多个储槽位于所述接触孔的周边，且每个储槽与所述接触孔间隔设置；沿垂直于所述衬底的方向，所述多个储槽和所述接触孔贯穿所述储槽层；
    设置于所述衬底上的电连接结构，所述电连接结构的一部分穿过所述接触孔；
    设置于每个所述储槽中的发光层；
    其中，所述接触孔在所述衬底上的正投影的边界的各位置点中，与位于所述接触孔周边的至少一个储槽的壁面之间距离最小的位置点为第一位置点；所述接触孔和所述多个储槽在所述衬底上的正投影为多边形或近似多边形，所述第一位置点不位于该多边形或所述近似多边形的拐角处，且所述接触孔中距离所述储槽最近的边，与所述储槽中靠近所述接触孔的边均不平行。
  2. 根据权利要求1所述的显示基板，其中，所述接触孔在所述衬底上的正投影的一条边，与位于所述接触孔周边的一个储槽在所述衬底上的正投影的拐角正对，且所述第一位置点位于这条边上。
  3. 根据权利要求2所述的显示基板，其中，所述储槽在所述衬底上的正投影的拐角为圆角；
    在所述接触孔及其正对的储槽在所述衬底上的正投影中，所述储槽正对的所述接触孔的圆角边界的平分点处的切线，与所述接触孔的正对所述储槽的边相互平行。
  4. 根据权利要求2或3所述的显示基板，其中，在一个所述像素区域内，所述接触孔和所述多个储槽在所述衬底上的正投影中，所述接触孔的多条边分别与位于所述接触孔周边的所述多个储槽的拐角正对。
  5. 根据权利要求4所述的显示基板，其中，所述接触孔在所述衬底上的正投影为矩形；
    一个所述像素区域内设置有四个所述储槽，所述接触孔的矩形正投影的四条边分别与位于所述接触孔周边的四个所述储槽的拐角正对；或者，
    一个所述像素区域内设置有三个所述储槽，所述接触孔的矩形正投影的四条边中的三条边分别与位于所述接触孔周边的三个所述储槽的拐角正对。
  6. 根据权利要求1～5中任一项所述的显示基板，其中，一个所述像素区域内设置有四个所述储槽；其中两个所述储槽中所设置的发光层为能够发射 蓝光的发光层，其余两个所述储槽中所设置的发光层分别为能够发射红光的发光层和能够发射绿光的发光层。
  7. 根据权利要求6所述的显示基板，其中，所述接触孔位于四个所述储槽的中心依次连线所形成的矩形的中心位置。
  8. 根据权利要求6或7所述的显示基板，其中，四个所述储槽在所述衬底上的正投影的面积相同。
  9. 根据权利要求1～5中任一项所述的显示基板，其中，一个所述像素区域内设置有三个所述储槽；其中一个所述储槽为第一储槽，所述第一储槽中所设置的发光层为能够发射蓝光的发光层，其余两个所述储槽为第二储槽，两个所述第二储槽中所设置的发光层分别为能够发射红光的发光层和能够发射绿光的发光层；
    所述第一储槽在所述衬底上的正投影的面积大于每个所述第二储槽在所述衬底上的正投影的面积。
  10. 根据权利要求9所述的显示基板，其中，三个所述储槽围绕所述接触孔设置。
  11. 根据权利要求9或10所述的显示基板，其中，所述第一储槽在所述衬底上的正投影的面积与每个所述第二储槽在所述衬底上的正投影的面积的比值，大于或等于1.5，且小于或等于6。
  12. 根据权利要求1～11中任一项所述的显示基板，其中，所述电连接结构包括：
    设置于所述衬底与所述储槽层之间的辅助电极，所述辅助电极位于所述接触孔的靠近所述衬底的一侧；
    设置于所述储槽层和所述发光层远离所述衬底的一侧的阴极层，所述阴极层的至少一部分陷入接触孔中，以使所述阴极层和所述辅助电极通过所述接触孔电连接。
  13. 根据权利要求12所述的显示基板，还包括：设置于所述衬底与所述发光层之间的阳极；
    设置于所述阳极与所述衬底之间的像素电路，所述像素电路与所述阳极电连接。
  14. 一种显示面板，包括：
    如权利要求1～13中任一项所述的显示基板；
    与所述显示基板叠加设置的光阻盖板，所述光阻盖板包括多个彩色滤光光阻，每个彩色滤光光阻与所述显示基板的一个所述储槽相对设置。
  15. 根据权利要求14所述的显示面板，其中，在所述显示基板的每个像素区域内的多个储槽中，至少两个储槽中所设置的发光层为能够发蓝光的发光层；
    所述光阻盖板中与所述能够发蓝光的发光层相对设置的彩色滤光光阻为蓝色光阻，同一像素区域内不同的能够发蓝光的发光层所对应的蓝色光阻，所能透过的蓝光波长范围不相同，或者所能透过的蓝光光谱的峰值不同。
  16. 一种显示设备，包括如权利要求14或15所述的显示面板。
PCT/CN2020/119278 2019-09-30 2020-09-30 显示基板、显示面板及显示设备 WO2021063390A1 (zh)

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