WO2020037961A1 - 一种有机发光二极管显示器 - Google Patents
一种有机发光二极管显示器 Download PDFInfo
- Publication number
- WO2020037961A1 WO2020037961A1 PCT/CN2019/075314 CN2019075314W WO2020037961A1 WO 2020037961 A1 WO2020037961 A1 WO 2020037961A1 CN 2019075314 W CN2019075314 W CN 2019075314W WO 2020037961 A1 WO2020037961 A1 WO 2020037961A1
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- WO
- WIPO (PCT)
- Prior art keywords
- layer
- organic light
- light emitting
- diode display
- emitting diode
- Prior art date
Links
- 239000010410 layer Substances 0.000 claims description 153
- 238000007641 inkjet printing Methods 0.000 claims description 74
- 239000000463 material Substances 0.000 claims description 60
- 239000000758 substrate Substances 0.000 claims description 19
- 238000007639 printing Methods 0.000 claims description 14
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 9
- 239000002356 single layer Substances 0.000 claims description 6
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 5
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 5
- 229920002120 photoresistant polymer Polymers 0.000 claims description 4
- 235000012239 silicon dioxide Nutrition 0.000 claims description 3
- 239000000377 silicon dioxide Substances 0.000 claims description 3
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 3
- 239000010408 film Substances 0.000 description 15
- 238000000034 method Methods 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 239000002904 solvent Substances 0.000 description 4
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 239000002105 nanoparticle Substances 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
Classifications
-
- 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
- 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
- the invention relates to the field of display technology, in particular to an organic light emitting diode display.
- OLEDs Organic light-emitting diodes
- OLEDs have the advantages of autonomous light emission, wide operating temperature range, fast response speed, wide viewing angle, high luminous efficiency, can be fabricated on flexible substrates, low driving voltage, and low energy consumption.
- OLED panels are mainly prepared by the evaporation process.
- the use of the evaporation process will reduce the material utilization rate.
- the OLED panel is then prepared using inkjet printing technology.
- the inkjet printing technology is to dissolve the OLED material in a solvent or to disperse the OLED material in the solvent as nano-sized droplets, and then spray the material on the surface of the substrate through a nozzle. Film formation by drying process.
- the inkjet printing technology has a high material utilization rate, a simple manufacturing process, and it is easy to manufacture large-size panels.
- the inkjet printing technology needs to strictly control the size of the liquid droplets ejected by the print head during the production process to ensure its uniformity.
- the volume of the inkjet printing ink must be the same for each light-emitting layer to ensure uniform film thickness. In the printing process, it is necessary to ensure that the ink-jet printing ink of the light-emitting layer is accurately sprayed on the corresponding light-emitting area, and cannot be sprayed to other light-emitting areas, otherwise color mixing will occur. It can be seen that the existing inkjet printing technology is prone to uneven film thickness and color mixing. The problem.
- An object of the present invention is to provide an organic light emitting diode display capable of improving uniformity of film thickness and reducing color mixing.
- an organic light emitting diode display which includes:
- a first conductive layer on the switch array layer including a plurality of anodes arranged at intervals;
- a plurality of pixel defining units including a first portion and a second portion, the first portion being located on a switch array layer not covered by the anode, and the second portion being located on the anode and located
- the material of the pixel defining unit includes an organic photoresist At least one of silicon nitride, silicon nitride, silicon oxide, and silicon dioxide; and
- the organic light emitting layer includes a plurality of organic light emitting units, and the organic light emitting units are located on an anode that is not covered by the second part.
- the second portion includes a first sublayer and a second sublayer, the second sublayer is located on the first sublayer, and the opening is provided on the second Sublayer.
- the height of the opening is the same as the thickness of the second sub-layer.
- the opening is used to communicate a light emitting region and the groove, and the light emitting region is a region located in the second portion and corresponding to the anode.
- the material of the second sublayer is opposite to the material of the light emitting layer inkjet printing ink, and the contact angle between the light emitting layer inkjet printing ink and the second sublayer is The range of is greater than 45 degrees; the material of the first sublayer is the same as the material of the light-emitting layer inkjet printing ink, and the range of the contact angle between the light-emitting layer inkjet printing ink and the first sublayer It is 10-45 degrees.
- a top of the anode is higher than a horizontal top of the groove, wherein the horizontal top is a top of a horizontal portion of the groove, and the groove includes a horizontal portion and a vertical portion.
- Straight section
- a height of the opening is smaller than a height of the second portion.
- the pixel defining unit has a single-layer structure, and the material of the first portion is the same as the material of the light-emitting layer inkjet printing ink, and the light-emitting layer inkjet printing ink is
- the contact angle of the first portion ranges from 10 degrees to 45 degrees.
- the material on the upper surface of the second portion is opposite to the material of the light-emitting layer inkjet printing ink.
- the range of the contact angle of the upper surface of the second portion is greater than 45 degrees.
- the thickness of the second portion is set according to the volume of the inkjet printing ink of the light emitting layer.
- the invention provides an organic light emitting diode display, which includes:
- a first conductive layer on the switch array layer including a plurality of anodes arranged at intervals;
- a plurality of pixel defining units including a first portion and a second portion, the first portion being located on a switch array layer not covered by the anode, and the second portion being located on the anode and located The periphery of the anode; the first portion is provided with a groove, and the second portion is provided with at least one opening;
- the organic light emitting layer includes a plurality of organic light emitting units, and the organic light emitting units are located on an anode that is not covered by the second part.
- the second portion includes a first sublayer and a second sublayer, the second sublayer is located on the first sublayer, and the opening is provided on the second Sublayer.
- the height of the opening is the same as the thickness of the second sub-layer.
- the opening is used to communicate a light emitting region and the groove, and the light emitting region is a region located in the second portion and corresponding to the anode.
- the material of the second sublayer is opposite to the material of the light emitting layer inkjet printing ink, and the contact angle between the light emitting layer inkjet printing ink and the second sublayer is The range of is greater than 45 degrees; the material of the first sublayer is the same as the material of the light-emitting layer inkjet printing ink, and the range of the contact angle between the light-emitting layer inkjet printing ink and the first sublayer 10 degrees to 45 degrees.
- the top of the anode is higher than the horizontal top of the groove, and the horizontal top is the top of the horizontal portion of the groove.
- a height of the opening is smaller than a height of the second portion.
- a width of the opening is smaller than a width of the second portion.
- the pixel defining unit has a single-layer structure, and the material of the first portion is the same as the material of the light-emitting layer inkjet printing ink, and the light-emitting layer inkjet printing ink is
- the contact angle of the first portion ranges from 10 degrees to 45 degrees.
- the material on the upper surface of the second portion is opposite to the material of the light-emitting layer inkjet printing ink.
- the range of the contact angle of the upper surface of the second portion is greater than 45 degrees.
- the thickness of the second portion is set according to the volume of the inkjet printing ink of the light emitting layer.
- the thickness of the pixel defining unit ranges from 0.5um to 10um.
- the organic light emitting diode display of the present invention since an opening and a groove are provided on the pixel definition unit, when the nozzle is shifted, the ink that is misprinted is printed into the groove, thereby preventing the light-emitting layer during the printing process. Inkjet printing ink is sprayed to other light-emitting areas to avoid color mixing. In addition, when the volume of the ink is large, the excess light-emitting layer of inkjet printing ink will also flow from the opening to the groove, thereby improving the uniformity of film thickness. .
- FIG. 1 is a schematic structural diagram of an OLED display according to the present invention.
- FIG. 2 is a top view of a second part of the pixel definition unit of the present invention.
- FIG. 3 is a cross-sectional view taken along the line AA ′ in FIG. 2 according to the first embodiment of the present invention
- FIG. 4 is a schematic structural diagram of a printed organic light emitting layer of an OLED display of the present invention.
- FIG. 5 is a second cross-sectional view taken along the line AA ′ in FIG. 2 according to the second embodiment of the present invention.
- FIG. 6 is a schematic structural diagram of printing ink droplet offset of the OLED display of the present invention.
- FIGS. 1 to 6 are schematic structural diagrams of an OLED display according to the present invention.
- the OLED display of the present invention mainly includes a base substrate 11, a switch array layer 12, a first conductive layer, a plurality of pixel definition units 14, and an organic light emitting layer 15.
- the switch array layer 12 is located on the base substrate 11.
- the switch array layer 12 may include a plurality of switching elements, such as a thin film transistor.
- a first conductive layer is located on the switch array layer 12.
- the first conductive layer includes a plurality of anodes 13 disposed at intervals.
- the pixel defining unit 14 is located between two adjacent anodes.
- the pixel defining unit 14 includes a first portion 141 and a second portion 142.
- the first portion 141 is located on the switch array layer 12 not covered by the anode. That is, the first portion includes a portion disposed laterally on the switch array layer 12 and a portion disposed vertically on the switch array layer 12, and the shape of the first portion is U-shaped.
- the second portion 142 is located on the anode 13 and is located on the periphery of the anode 13, that is, the second portion 142 is disposed on the periphery of the anode 13.
- the second portion 142 defines a light-emitting area for the anode 13, that is, the light-emitting area is an area corresponding to the anode located in the second portion 142, or the light-emitting area is located on the anode 13 not covered by the second portion 142, and
- the height of the light emitting area is smaller than the height of the second portion 142 (that is, the area where the inner rectangle is located in FIG. 2).
- the first portion 141 is provided with a groove 22 including a horizontal portion and a vertical portion.
- the top of the anode 13 is larger than the horizontal top of the groove 22, and the horizontal top is the top of the horizontal portion of the groove 22, that is, the groove 22 includes two side walls and a bottom, and the horizontal top is the The top surface of the bottom of the groove 22.
- the second portion 142 is provided with an opening 21; the height H2 of the opening is smaller than the height of the second portion 142, and the height of the second portion 142 is H2 plus H1.
- the opening 21 is used to communicate the light-emitting area and the groove 22, and the light-emitting area is a region located in the second portion 142 and corresponding to the anode.
- the second part 142 in FIG. 2 is provided with four openings 21, the present invention is not limited thereto, and the present invention may be provided with one or more openings.
- the opening 21 may be at any position of the second portion 142.
- the width of the opening 21 is smaller than the width of the second portion 142.
- a cross-sectional shape of the second portion 142 is a quadrangle, and an opening is provided on at least one side of the second portion 142. 21.
- the width of the opening 21 on one side of the second portion 142 is smaller than the width of the corresponding side of the second portion 142.
- the width L of the opening 21 on the upper side of the second portion 142 is smaller than the width W of the upper side of the second portion 142.
- the cross-sectional shape of the second portion 142 may also be circular or other shapes.
- the length L of the opening 21 on one side of the second portion 142 is less than or equal to the length of the corresponding side of the second portion 142.
- the width of the opening 21 on the upper side of the second portion 142 is smaller than the length of the upper side of the second portion 142.
- the height of the inside of the opening 21 is smaller than the height of the outside of the opening 21.
- the outside of the opening 21 is close to the groove 22, and the inside of the opening 21 is far from the groove 22.
- the material of the pixel definition unit 14 may be an organic material or an inorganic material, which includes at least one of an organic photoresist, silicon nitride, silicon oxide, and silicon dioxide.
- the thickness of the second portion 142 is set according to the volume of the inkjet printing ink of the light emitting layer.
- the thickness of the second portion 142 is related to the volume of the ink-jet printing ink of the light-emitting layer.
- the top of the ink-jet printing ink of the light-emitting layer printed in the light-emitting region may be higher than the thickness of the second portion 142, but may not exceed the thickness of the second portion 142. 50%.
- the ink that exceeds the second portion 142 flows into the groove 22 through the opening 21.
- the thickness of the pixel defining unit 14 ranges from 0.5um to 10um.
- the pixel definition unit 14 has a single-layer structure. That is, both the first portion 141 and the second portion 142 are of a single layer structure.
- the material of the first portion 141 has the same polarity as the material of the light-emitting layer inkjet printing ink, and the contact angle between the light-emitting layer inkjet printing ink and the first portion ranges from 10 degrees to 45
- the material of the upper surface of the second portion 142 has the opposite polarity to the material of the light-emitting layer inkjet printing ink, and the contact angle of the light-emitting layer inkjet printing ink with the upper surface of the second portion is The range is greater than 45 degrees. It can be understood that the contact angle of the side wall of the second portion 142 and the light-emitting layer inkjet printing ink ranges from 10 degrees to 45 degrees.
- the organic light emitting layer 15 is located on the anode 13 not covered by the second portion 142, and the organic light emitting layer 15 is formed by printing a light emitting layer inkjet printing ink 24 on the anode 13 not covered by the second portion 142. of. Specifically, the light-emitting layer inkjet printing ink 24 is printed through the nozzle 23, and the light-emitting layer inkjet printing ink 24 is formed by dissolving the OLED material in a solvent or dispersing the OLED material in the solvent as nano-sized droplets.
- the material of the pixel definition unit is coated on the surface of the substrate having the anode, and cured to form the pixel definition unit 14.
- the material of the pixel definition unit 14 and the light emission The material of the inkjet printing ink 24 has the same polarity, and the contact angle of the light-emitting inkjet printing ink 24 and the pixel definition unit 14 ranges from 10 to 45 degrees to improve the uniformity of the film thickness of the organic light-emitting layer. .
- the material of the first portion has the same polarity as the material of the light-emitting layer inkjet printing ink, and the contact angle between the light-emitting layer inkjet printing ink and the first portion 141 ranges from 10 degrees to 45 degrees;
- the upper surface of the second portion 142 is processed to obtain a surface having a polarity opposite to that of the material of the light-emitting layer inkjet printing ink 24.
- the light-emitting layer inkjet printing ink 24 and the second portion 142 The upper surface contact angle is greater than 45 degrees. That is, the material of the upper surface of the second portion is opposite to the polarity of the material of the light-emitting layer inkjet printing ink, and the range of the contact angle between the light-emitting layer inkjet printing ink and the upper surface of the second portion More than 45 degrees.
- the anode 13 not covered by the second part 142 is exposed and developed to form a light-emitting area; the area of the pixel definition unit 14 on the switch array layer 12 that needs to be grooved is exposed and developed to obtain the groove 22; The area where the opening 21 is to be formed on the portion 142 is exposed and developed to obtain the opening 21.
- the nozzle 23 when using the nozzle 23 to print the light-emitting layer inkjet printing ink 24 on the light-emitting region of the substrate, if the height of the light-emitting layer inkjet printing ink 24 in the light-emitting region is higher than the height of the opening 21 of the second portion 142 A part of the light-emitting layer inkjet printing ink 24 flows into the groove 22. Thereafter, the ink-jet printing ink 24 of the light-emitting layer to be printed is baked to form a film, and then the organic light-emitting layer 15 is formed by film printing or vacuum plating.
- part of the pixel definition unit 14 has a double-layer structure, that is, the second portion 142 has a double-layer structure.
- the second portion 142 includes a first sub-layer 31 and a second sub-layer 32.
- the second sub-layer 32 is located on the first sub-layer 31.
- the opening 21 is provided on the second sub-layer 32. .
- the height of the opening 21 and the thickness of the second sub-layer 32 are the same.
- the height of the inside of the opening 21 is smaller than the height of the outside of the opening 21.
- the outside of the opening 21 is close to the groove 22, and the inside of the opening 21 is far from the groove 22.
- the material of the first sub-layer 31 is coated on the surface of the substrate having the anode, and cured to form the first sub-layer 31.
- the material of the first sub-layer 31 The polarity of the material of the light-emitting layer inkjet printing ink 24 is the same, and the contact angle of the light-emitting layer inkjet printing ink 24 and the first sub-layer 31 ranges from 10 to 45 degrees.
- the anode 13 not covered by the second portion 142 is exposed and developed to form a light-emitting area; the first sub-layer 31 on the switch array layer 12 needs to be exposed and developed to form a groove 22 to obtain a groove.
- the surface of the substrate is coated with the material of the second sublayer 32, and the second sublayer 32 is cured, illuminated, and developed to form the second sublayer 32.
- the area on the second sublayer 32 where an opening is to be provided is illuminated and developed to form the opening 22.
- the time for illumination and development varies.
- the material of the second sub-layer 32 is opposite to the material of the light-emitting layer inkjet printing ink 24, and the contact angle range of the light-emitting layer inkjet printing ink 24 and the second sub-layer 32 is greater than 45 degree.
- the ink volume in each light-emitting area between the entire panel and the substrate is different, resulting in uneven film thickness and affecting the uniformity of light emission.
- the present invention accurately calculates the height required for the opening 21 according to the ink concentration, and during the printing process, the volume of the printing ink can be designed to be larger than the actual required volume, and the excess ink will flow into the groove 22 through the opening 21 Therefore, the amount of the final ink in each light-emitting area is related to the height of the opening, that is, the height of the opening on each pixel defining unit is consistent, so that the film thickness of all organic light-emitting layers is consistent.
- the groove 22 is provided on the first part 141, so that excess ink in the light-emitting area can flow into the groove 22.
- the excess The ink can flow into the groove 22 through the opening 21 on the second part, that is, the amount of ink remaining in each light-emitting area is related to the height of the opening on the second part, so by controlling the height of the opening, organic light can be ensured Uniformity of film thickness.
- the nozzle 23 when using the nozzle 23 to print the light-emitting layer inkjet printing ink 24 on the light-emitting region of the substrate, if the height of the light-emitting layer inkjet printing ink 24 in the light-emitting region is higher than the height of the opening 21 of the second portion 142, Part of the light-emitting layer inkjet printing ink 24 flows from the opening 21 into the groove 22. Thereafter, the ink-jet printing ink 24 of the light-emitting layer to be printed is baked to form a film, and then the organic light-emitting layer 15 is formed by film printing or vacuum plating.
- the wrongly printed light-emitting layer inkjet printing ink 24 (hereinafter referred to as ink) will be printed into the groove 22 to avoid color mixing;
- the ink 24 printed on the second part 142 will flow into the groove, but not into the light-emitting area corresponding to other colors, so as to avoid color mixing.
- the ink printed in the light-emitting area is excessive, the excessive ink will flow to the groove through the opening on the second part to avoid uneven thickness of the organic light-emitting layer due to the difference in ink droplet volume.
- the pixel defining unit is provided with an opening and a groove
- the ink that is misprinted is printed into the groove to prevent the light-emitting layer from being sprayed during the printing process.
- Ink printing ink is sprayed to other light-emitting areas to avoid color mixing.
- the excess light-emitting layer inkjet printing ink will also flow from the opening to the groove, thereby improving the uniform thickness of the organic light-emitting layer. Sex.
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Abstract
本发明提供一种有机发光二极管显示器，该显示器包括：多个像素定义单元，所述像素定义单元包括位于未被所述阳极覆盖的开关阵列层上的第一部分和位于所述阳极上的第二部分，所述第一部分设置有凹槽，所述第二部分设置有至少一个开口；有机发光层，包括多个有机发光单元，所述有机发光单元位于未被所述第二部分覆盖的阳极上。
Description
本发明涉及显示技术领域，特别是涉及一种有机发光二极管显示器。
有机发光二极管（organic light-emitting diode，OLED）具有自主发光、工作温度范围宽、响应速度快、视角广、发光效率高、可制作在柔性衬底上、驱动电压以及能耗低等优点，被誉为下一代的显示技术。
但是由于目前OLED存在技术难以及成本高的因素，导致其难以像LCD一样大规模量产，从而造成巨大的市场缺口。目前OLED面板主要是依靠蒸镀工艺来制备，但是采用蒸镀工艺会降低材料的利用率，且对于大尺寸面板，特别是对于采用FMM技术的OLED面板，由于基板弯曲，因此难以保证膜厚均匀性。
随后OLED面板采用喷墨打印技术来制备，喷墨打印技术是将OLED材料溶解在溶剂中或将OLED材料以纳米级小液滴分散在溶剂中，之后通过喷嘴将该材料喷印在基板表面并通过干燥工艺成膜。喷墨印刷技术具有较高的材料利用率，制作工艺简单，容易制作大尺寸面板。
但是喷墨打印技术在制作过程中需要严格控制打印喷头喷出的液滴大小，以保证其均匀性，其次每个发光层喷墨打印墨水的体积必须一致，以保证膜厚均匀性；另外在打印过程中需要保证发光层喷墨打印墨水精确地喷在相应的发光区，不能喷到其他发光区，否则会发生混色，可见现有的喷墨印刷技术容易产生膜厚不均以及容易产生混色的问题。
本发明的目的在于提供一种有机发光二极管显示器，能够提高膜厚的均匀性以及降低混色。
为解决上述技术问题，本发明提供一种有机发光二极管显示器，其包括：
衬底基板；
开关阵列层，位于所述衬底基板上；
第一导电层，位于所述开关阵列层上，所述第一导电层包括多个间隔设置的阳极；
多个像素定义单元，所述像素定义单元包括第一部分和第二部分，所述第一部分位于未被所述阳极覆盖的开关阵列层上，所述第二部分位于所述阳极上，且位于所述阳极的周缘；所述第一部分设置有凹槽，所述第二部分设置有至少一个开口；所述开口的宽度小于所述第二部分的宽度；所述像素定义单元的材料包括有机光阻、氮化硅、氧化硅以及二氧化硅中的至少一种；以及
有机发光层，包括多个有机发光单元，所述有机发光单元位于未被所述第二部分覆盖的阳极上。
在本发明的有机发光二极管显示器中，所述第二部分包括第一子层和第二子层，所述第二子层位于所述第一子层上，所述开口设置在所述第二子层上。
在本发明的有机发光二极管显示器中，所述开口的高度和所述第二子层的厚度相同。
在本发明的有机发光二极管显示器中，所述开口用于连通发光区和所述凹槽，所述发光区为位于第二部分内，且与所述阳极对应的区域。
在本发明的有机发光二极管显示器中，所述第二子层的材料与发光层喷墨打印墨水的材料的极性相反，所述发光层喷墨打印墨水与所述第二子层的接触角的范围大于45度；所述第一子层的材料与所述发光层喷墨打印墨水的材料的极性相同，所述发光层喷墨打印墨水与所述第一子层的接触角的范围为10度-45度。
在本发明的有机发光二极管显示器中，所述阳极的顶部高于所述凹槽的水平顶部，其中所述水平顶部为所述凹槽的水平部分的顶部，所述凹槽包括水平部分和竖直部分。
在本发明的有机发光二极管显示器中，所述开口的高度小于所述第二部分的高度。
在本发明的有机发光二极管显示器中，所述像素定义单元为单层结构，所述第一部分的材料与发光层喷墨打印墨水的材料的极性相同，所述发光层喷墨打印墨水与所述第一部分的接触角的范围为10度—45度；所述第二部分的上表面的材料与所述发光层喷墨打印墨水的材料的极性相反，所述发光层喷墨打印墨水与所述第二部分的上表面的接触角的范围大于45度。
在本发明的有机发光二极管显示器中，所述第二部分的厚度根据发光层喷墨打印墨水的体积设置。
本发明提供一种有机发光二极管显示器，其包括：
衬底基板；
开关阵列层，位于所述衬底基板上；
第一导电层，位于所述开关阵列层上，所述第一导电层包括多个间隔设置的阳极；
多个像素定义单元，所述像素定义单元包括第一部分和第二部分，所述第一部分位于未被所述阳极覆盖的开关阵列层上，所述第二部分位于所述阳极上，且位于所述阳极的周缘；所述第一部分设置有凹槽，所述第二部分设置有至少一个开口；
有机发光层，包括多个有机发光单元，所述有机发光单元位于未被所述第二部分覆盖的阳极上。
在本发明的有机发光二极管显示器中，所述第二部分包括第一子层和第二子层，所述第二子层位于所述第一子层上，所述开口设置在所述第二子层上。
在本发明的有机发光二极管显示器中，所述开口的高度和所述第二子层的厚度相同。
在本发明的有机发光二极管显示器中，所述开口用于连通发光区和所述凹槽，所述发光区为位于第二部分内，且与所述阳极对应的区域。
在本发明的有机发光二极管显示器中，所述第二子层的材料与发光层喷墨打印墨水的材料的极性相反，所述发光层喷墨打印墨水与所述第二子层的接触角的范围大于45度；所述第一子层的材料与所述发光层喷墨打印墨水的材料的极性相同，所述发光层喷墨打印墨水与所述第一子层的接触角的范围为10度—45度。
在本发明的有机发光二极管显示器中，所述阳极的顶部高于所述凹槽的水平顶部，所述水平顶部为所述凹槽的水平部分的顶部。
在本发明的有机发光二极管显示器中，所述开口的高度小于所述第二部分的高度。
在本发明的有机发光二极管显示器中，所述开口的宽度小于所述第二部分的宽度。
在本发明的有机发光二极管显示器中，所述像素定义单元为单层结构，所述第一部分的材料与发光层喷墨打印墨水的材料的极性相同，所述发光层喷墨打印墨水与所述第一部分的接触角的范围为10度—45度；所述第二部分的上表面的材料与所述发光层喷墨打印墨水的材料的极性相反，所述发光层喷墨打印墨水与所述第二部分的上表面的接触角的范围大于45度。
在本发明的有机发光二极管显示器中，所述第二部分的厚度根据发光层喷墨打印墨水的体积设置。
在本发明的有机发光二极管显示器中，所述像素定义单元的厚度范围为0.5um-10um。
本发明的有机发光二极管显示器，由于在像素定义单元上设置开口和凹槽，因此当喷嘴发生偏移时，将误喷印的墨水喷印到凹槽中，从而防止在喷印过程中发光层喷墨打印墨水喷到其他发光区，避免了出现混色；另外当墨水的体积较大时，多余的发光层喷墨打印墨水也会从开口处流向凹槽内，从而提高了膜厚的均匀性。
图1为本发明OLED显示器的结构示意图；
图2为本发明像素定义单元的第二部分的俯视图；
图3为本发明实施例一中图2中沿AA’方向的剖视图；
图4为本发明OLED显示器的打印有机发光层的结构示意图；
图5为本发明实施例二中图2中沿AA’方向的第二种剖视图；
图6为本发明OLED显示器的打印墨滴偏移的结构示意图。
以下各实施例的说明是参考附加的图式，用以例示本发明可用以实施的特定实施例。本发明所提到的方向用语，例如「上」、「下」、「前」、「后」、「左」、「右」、「内」、「外」、「侧面」等，仅是参考附加图式的方向。因此，使用的方向用语是用以说明及理解本发明，而非用以限制本发明。在图中，结构相似的单元是以相同标号表示。
请参照图1至6，图1为本发明OLED显示器的结构示意图。
本发明的OLED显示器主要包括衬底基板11、开关阵列层12、第一导电层、多个像素定义单元14以及有机发光层15。
开关阵列层12位于所述衬底基板11上，该开关阵列层12可以包括多个开关元件，开关元件比为如薄膜晶体管。
第一导电层位于所述开关阵列层12上，所述第一导电层包括多个间隔设置的阳极13。
所述像素定义单元14位于相邻两个阳极之间，所述像素定义单元14包括第一部分141和第二部分142，所述第一部分141位于未被所述阳极覆盖的开关阵列层12上，也即第一部分包括横向设置在开关阵列层12上的部分和竖直设置在开关阵列层12上的部分，第一部分的形状为U形。结合图2，所述第二部分142位于所述阳极13上，且位于所述阳极13的周缘，也即第二部分142设置在阳极13的周缘上。第二部分142对阳极13限定形成发光区，也即发光区为与位于第二部分142内且与阳极对应的区域，或者发光区位于未被所述第二部分142覆盖的阳极13上，且发光区的高度小于第二部分142的高度（也即图2中内侧长方形所在的区域）。
所述第一部分141设置有凹槽22，所述凹槽22包括水平部分和竖直部分。所述阳极13的顶部大于所述凹槽22的水平顶部，所述水平顶部为所述凹槽22水平部分的顶部，也即所述凹槽22包括两侧壁和底部，水平顶部为所述凹槽22底部的顶表面。
所述第二部分142设置有开口21；所述开口的高度H2小于所述第二部分142的高度，第二部分142的高度为H2加上H1。
所述开口21用于连通发光区和所述凹槽22，所述发光区为与位于第二部分142内且与阳极对应的区域。尽管图2中第二部分142设置有四个开口21，但是并不能对本发明构成限定，本发明可设置一个或者一个以上的开口。开口21可以在第二部分142的任意位置。所述开口21的宽度小于所述第二部分142的宽度，比如在一实施方式中，所述第二部分142的截面形状为四边形，在所述第二部分142的至少一条边上设置有开口21，位于所述第二部分142的一侧边上的开口21的宽度小于所述第二部分142对应边的宽度。比如位于第二部分142上侧边上的开口21的宽度L小于所述第二部分142的上侧边的宽度W。当然可以理解的，所述第二部分142的截面形状也可以为圆形或者其它形状。
位于所述第二部分142的一侧边上的开口21的长度L小于等于第二部分142的对应边的长度。位于第二部分142上侧边上的开口21的宽度小于所述第二部分142的上侧边的长度。
在一实施方式中，该开口21的内侧的高度小于该开口21的外侧的高度。其中开口21的外侧靠近凹槽22，所述开口21的内侧远离凹槽22。
所述像素定义单元14的材料可以为有机材料或者无机材料，其包括有机光阻、氮化硅、氧化硅以及二氧化硅中的至少一种。
为了使有机发光层的膜后更加均匀，所述第二部分142的厚度根据所述发光层喷墨打印墨水的体积设置。所述第二部分142的厚度与发光层喷墨打印墨水的体积相关，发光区内打印发光层喷墨打印墨水的顶部可高于第二部分142的厚度，但是不能超过第二部分142厚度的50%。其中超过第二部分142的墨水通过开口21流入凹槽22中。
进一步地，所述像素定义单元14的厚度范围为0.5um-10um。
在一实施例中，如图3所示，所述像素定义单元14为单层结构。也即所述第一部分141和第二部分142都为单层结构。
结合图4，所述第一部分141的材料与所述发光层喷墨打印墨水的材料的极性相同，所述发光层喷墨打印墨水与所述第一部分的接触角的范围为10度-45度；所述第二部分142的上表面的材料与所述发光层喷墨打印墨水的材料的极性相反，所述发光层喷墨打印墨水与所述第二部分的上表面的接触角的范围大于45度。可以理解的，所述第二部分142的侧壁与所述发光层喷墨打印墨水的接触角的范围也为10度-45度。
有机发光层15位于未被所述第二部分142覆盖的阳极13上，所述有机发光层15通过在未被所述第二部分142覆盖的阳极13上喷印发光层喷墨打印墨水24形成的。具体是通过喷嘴23喷印发光层喷墨打印墨水24，发光层喷墨打印墨水24是将OLED材料溶解在溶剂中或将OLED材料以纳米级小液滴分散在溶剂中形成的。
具体在制程过程中，在制作完阳极13后，在具有阳极的基板的表面涂布像素定义单元的材料，并对其固化形成像素定义单元14，所述像素定义单元14的材料与所述发光层喷墨打印墨水24的材料的极性相同，所述发光层喷墨打印墨水24与所述像素定义单元14的接触角的范围为10-45度，以提高有机发光层的膜厚均匀性。也即所述第一部分的材料与所述发光层喷墨打印墨水的材料的极性相同，所述发光层喷墨打印墨水与所述第一部分141的接触角的范围为10度-45度；
之后对第二部分142的上表面进行处理，得到与所述发光层喷墨打印墨水24的材料的极性相反的表面，此时所述发光层喷墨打印墨水24与所述第二部分142的上表面接触角度大于45度。也即所述第二部分的上表面的材料与所述发光层喷墨打印墨水的材料的极性相反，所述发光层喷墨打印墨水与所述第二部分的上表面的接触角的范围大于45度。
对未被第二部分142覆盖的阳极13进行曝光、显影形成发光区；对位于开关阵列层12上的像素定义单元14中需要形成凹槽的区域进行曝光、显影得到凹槽22；对第二部分142上需要形成开口21的区域进行曝光、显影得到开口21。
结合图4，当用喷嘴23对上述基板的发光区打印发光层喷墨打印墨水24，如果发光层喷墨打印墨水24在发光区的高度高于第二部分142的开口21的高度时，多余部分的发光层喷墨打印墨水24流向凹槽22内。之后对喷印的发光层喷墨打印墨水24进行烘烤成膜，再进行膜层打印或真空镀膜形成有机发光层15。
在另一实施例中，如图5所示，部分所述像素定义单元14为双层结构，也即所述第二部分142为双层结构。所述第二部分142包括第一子层31和第二子层32，所述第二子层32位于所述第一子层31上，所述开口21设置在所述第二子层32上。
优选地，为了简化生产工艺，降低生产成本，所述开口21的高度和所述第二子层32的厚度相同。
在一实施方式中，为了进一步提高有机发光层的膜厚均匀性，该开口21的内侧的高度小于该开口21的外侧的高度。其中开口21的外侧靠近凹槽22，所述开口21的内侧远离凹槽22。
具体在制程过程中，在制作完阳极13后，在具有阳极的基板的表面涂布第一子层31的材料，并对其固化形成第一子层31，所述第一子层31的材料与所述发光层喷墨打印墨水24的材料的极性相同，所述发光层喷墨打印墨水24与所述第一子层31的接触角的范围为10-45度。
对未被第二部分142覆盖的阳极13进行曝光、显影形成发光区；对位于开关阵列层12上的第一子层31需要形成凹槽的区域进行曝光、显影得到凹槽22。
在基板的表面涂布第二子层32的材料，并对其固化、光照、显影形成第二子层32，对第二子层32上需要设置开口的区域进行光照和显影，形成开口22。根据所使用的光刻胶不同，光照和显影的时间不同。所述第二子层32的材料与所述发光层喷墨打印墨水24的材料的极性相反，所述发光层喷墨打印墨水24与所述第二子层32的接触角的范围大于45度。
由于在打印过程中，可能会发生喷嘴喷出的墨水的体积有差异的情况，此时对于整个面板和基板间各个发光区内的墨水体积不一样，从而导致膜厚不均，影响发光均匀性，因此本发明根据墨水的浓度准确计算出开口21所需的高度，并且打印过程中可以设计打印墨水的体积多于实际所需的体积，多余的墨水就会通过开口21流入到凹槽22中，从而每个发光区内最终墨水的量与开口的高度有关，也即通过使每个像素定义单元上开口的高度一致，从而达到所有有机发光层的膜厚一致。
由于第一部分141上设置有凹槽22，使得发光区内的多余的墨水可以流到凹槽22中，通过控制凹槽22的高度，当在每个发光区打印的墨水量较多时，多余的墨水可以通过第二部分上的开口21流到凹槽22中，也即每个发光区内剩余的墨水量与第二部分上开口的高度有关，因此通过控制开口的高度，便可确保有机发光层膜厚的均匀性。
结合图6，当用喷嘴23对上述基板的发光区打印发光层喷墨打印墨水24，如果发光层喷墨打印墨水24在发光区的高度高于第二部分142的开口21的高度时，多余部分的发光层喷墨打印墨水24从开口21流向凹槽22内。之后对喷印的发光层喷墨打印墨水24进行烘烤成膜，再进行膜层打印或真空镀膜形成有机发光层15。
结合图6，在OLED打印过程中当喷嘴23的位置发生偏移的时候，一方面错误打印的发光层喷墨打印墨水24（以下简称墨水）会打印到凹槽22中，避免出现混色；另一方面打印到第二部分142上的墨水24会流到凹槽中，而不会流到别的颜色对应的发光区，避免出现混色。此外，当打印到发光区内的墨水过量的时候，过量的墨水会通过第二部分上的开口流到凹槽，避免因为墨滴体积的差异造成有机发光层的膜厚不均。
本发明的有机发光二极管显示器，由于在像素定义单元上设置开口和凹槽，因此当喷嘴发生偏移时，将误喷印的墨水喷印到凹槽中，防止在喷印过程中发光层喷墨打印墨水喷到其他发光区，从而避免出现混色；当墨水的体积较大时，多余的发光层喷墨打印墨水也会从开口处流向凹槽内，从而提高了有机发光层膜厚的均匀性。
综上所述，虽然本发明已以优选实施例揭露如上，但上述优选实施例并非用以限制本发明，本领域的普通技术人员，在不脱离本发明的精神和范围内，均可作各种更动与润饰，因此本发明的保护范围以权利要求界定的范围为准.
Claims (20)
- 一种有机发光二极管显示器，其包括：衬底基板；开关阵列层，位于所述衬底基板上；第一导电层，位于所述开关阵列层上，所述第一导电层包括多个间隔设置的阳极；多个像素定义单元，所述像素定义单元包括第一部分和第二部分，所述第一部分位于未被所述阳极覆盖的开关阵列层上，所述第二部分位于所述阳极上，且位于所述阳极的周缘；所述第一部分设置有凹槽，所述第二部分设置有至少一个开口；所述开口的宽度小于所述第二部分的宽度；所述像素定义单元的材料包括有机光阻、氮化硅、氧化硅以及二氧化硅中的至少一种；以及有机发光层，包括多个有机发光单元，所述有机发光单元位于未被所述第二部分覆盖的阳极上。
- 根据权利要求1所述的有机发光二极管显示器，其中所述第二部分包括第一子层和第二子层，所述第二子层位于所述第一子层上，所述开口设置在所述第二子层上。
- 根据权利要求2所述的有机发光二极管显示器，其中所述开口的高度和所述第二子层的厚度相同。
- 根据权利要求2所述的有机发光二极管显示器，其中所述开口用于连通发光区和所述凹槽，所述发光区为位于第二部分内，且与所述阳极对应的区域。
- 根据权利要求2所述的有机发光二极管显示器，其中所述第二子层的材料与发光层喷墨打印墨水的材料的极性相反，所述发光层喷墨打印墨水与所述第二子层的接触角的范围大于45度；所述第一子层的材料与所述发光层喷墨打印墨水的材料的极性相同，所述发光层喷墨打印墨水与所述第一子层的接触角的范围为10度-45度。
- 根据权利要求1所述的有机发光二极管显示器，其中所述阳极的顶部高于所述凹槽的水平顶部，其中所述水平顶部为所述凹槽的水平部分的顶部，所述凹槽包括水平部分和竖直部分。
- 根据权利要求1所述的有机发光二极管显示器，其中所述开口的高度小于所述第二部分的高度。
- 根据权利要求1所述的有机发光二极管显示器，其中所述像素定义单元为单层结构，所述第一部分的材料与发光层喷墨打印墨水的材料的极性相同，所述发光层喷墨打印墨水与所述第一部分的接触角的范围为10度—45度；所述第二部分的上表面的材料与所述发光层喷墨打印墨水的材料的极性相反，所述发光层喷墨打印墨水与所述第二部分的上表面的接触角的范围大于45度。
- 根据权利要求1所述的有机发光二极管显示器，其中所述第二部分的厚度根据发光层喷墨打印墨水的体积设置。
- 一种有机发光二极管显示器，其包括：衬底基板；开关阵列层，位于所述衬底基板上；第一导电层，位于所述开关阵列层上，所述第一导电层包括多个间隔设置的阳极；多个像素定义单元，所述像素定义单元包括第一部分和第二部分，所述第一部分位于未被所述阳极覆盖的开关阵列层上，所述第二部分位于所述阳极上，且位于所述阳极的周缘；所述第一部分设置有凹槽，所述第二部分设置有至少一个开口；以及有机发光层，包括多个有机发光单元，所述有机发光单元位于未被所述第二部分覆盖的阳极上。
- 根据权利要求10所述的有机发光二极管显示器，其中所述第二部分包括第一子层和第二子层，所述第二子层位于所述第一子层上，所述开口设置在所述第二子层上。
- 根据权利要求11所述的有机发光二极管显示器，其中所述开口的高度和所述第二子层的厚度相同。
- 根据权利要求12所述的有机发光二极管显示器，其中所述开口用于连通发光区和所述凹槽，所述发光区为位于第二部分内，且与所述阳极对应的区域。
- 根据权利要求11所述的有机发光二极管显示器，其中所述第二子层的材料与发光层喷墨打印墨水的材料的极性相反，所述发光层喷墨打印墨水与所述第二子层的接触角的范围大于45度；所述第一子层的材料与所述发光层喷墨打印墨水的材料的极性相同，所述发光层喷墨打印墨水与所述第一子层的接触角的范围为10度-45度。
- 根据权利要求10所述的有机发光二极管显示器，其中所述阳极的顶部高于所述凹槽的水平顶部，其中所述水平顶部为所述凹槽的水平部分的顶部，所述凹槽包括水平部分和竖直部分。
- 根据权利要求10所述的有机发光二极管显示器，其中所述开口的高度小于所述第二部分的高度。
- 根据权利要求10所述的有机发光二极管显示器，其中所述开口的宽度小于所述第二部分的宽度。
- 根据权利要求10所述的有机发光二极管显示器，其中所述像素定义单元为单层结构，所述第一部分的材料与发光层喷墨打印墨水的材料的极性相同，所述发光层喷墨打印墨水与所述第一部分的接触角的范围为10度—45度；所述第二部分的上表面的材料与所述发光层喷墨打印墨水的材料的极性相反，所述发光层喷墨打印墨水与所述第二部分的上表面的接触角的范围大于45度。
- 根据权利要求10所述的有机发光二极管显示器，其中所述第二部分的厚度根据发光层喷墨打印墨水的体积设置。
- 根据权利要求10所述的有机发光二极管显示器，其中所述像素定义单元的厚度范围为0.5um-10um。
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