WO2018166176A1 - 一种显示基板及显示装置 - Google Patents

一种显示基板及显示装置 Download PDF

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WO2018166176A1
WO2018166176A1 PCT/CN2017/103941 CN2017103941W WO2018166176A1 WO 2018166176 A1 WO2018166176 A1 WO 2018166176A1 CN 2017103941 W CN2017103941 W CN 2017103941W WO 2018166176 A1 WO2018166176 A1 WO 2018166176A1
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pixel
sub
display substrate
driving voltage
functional
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PCT/CN2017/103941
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English (en)
French (fr)
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李杰威
熊先江
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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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Priority to US15/772,977 priority Critical patent/US11018196B2/en
Publication of WO2018166176A1 publication Critical patent/WO2018166176A1/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
    • 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
    • H10K50/00—Organic light-emitting devices
    • H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
    • H10K50/14—Carrier transporting layers
    • H10K50/15—Hole transporting layers
    • H10K50/155—Hole transporting layers comprising dopants
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
    • H10K50/17—Carrier injection layers

Definitions

  • the present disclosure relates to the field of display, and in particular to a display substrate and a display device.
  • the hole transport layer is usually p-type doped. This results in an increase in the injection capability of holes of the OLED, as well as a reduction in driving voltage and power consumption.
  • p-type doping can cause a significant decrease in the lateral resistance of the layer while reducing the driving voltage. Therefore, it is easy to generate a lateral current after the OLED is energized. This situation leads to the fact that when a sub-pixel with a slightly larger longitudinal resistance is lit, its circuit tends to be transmitted laterally, so that adjacent sub-pixels of other longitudinal resistances are also illuminated at the same time. This phenomenon is called sub-pixel stealing, and macroscopically appears as pixel crosstalk. This leads to a decrease in color purity, an increase in power consumption, and an adverse effect such as a deterioration in image quality.
  • An object of the present disclosure is to provide an OLED display substrate and a display device capable of solving the pixel crosstalk problem of the conventional display device.
  • an embodiment of the present disclosure provides a display substrate, including: a substrate, an anode, an organic light-emitting layer, and a cathode sequentially formed on the substrate;
  • the display substrate further includes a functional pattern formed between the organic light emitting layer and the anode, the functional graphic is classified according to colors of the plurality of sub-pixels, and the functional graphics of each category are set in the corresponding Within the area of the sub-pixel of color;
  • the driving voltages of the plurality of sub-pixels of different colors are different, and the functional graphics of each category are
  • the resistance value in the direction perpendicular to the organic light-emitting layer decreases as the driving voltage of the sub-pixels of different colors corresponding to the functional patterns of the respective classes increases.
  • the plurality of different color sub-pixels include a first color sub-pixel and a second color sub-pixel, the functional graphic including a first functional graphic corresponding to the first color sub-pixel and a corresponding second color sub-pixel a second function pattern, a driving voltage of the first color sub-pixel is greater than a driving voltage of the second color sub-pixel, and a resistance value of the first functional pattern in a direction perpendicular to the organic light-emitting layer is smaller than the
  • the second functional pattern has a resistance value in a direction perpendicular to the organic light-emitting layer.
  • a resistance value of the first functional pattern in a direction perpendicular to the organic light emitting layer and a resistance value of the second functional pattern in a direction perpendicular to the organic light emitting layer are selected such that The actual driving voltage of one color sub-pixel is close to the actual driving voltage of the second color sub-pixel.
  • the ratio of the actual driving voltage of the first color sub-pixel to the actual driving voltage of the second color sub-pixel is between 0.985 and 1.015.
  • the functional pattern is a p-doped functional pattern, and a material doping concentration of the first functional pattern is greater than a material doping concentration of the second functional pattern.
  • the sub-pixel includes a red sub-pixel, a green sub-pixel, and a blue sub-pixel; wherein, a driving voltage of the green sub-pixel is smaller than a driving voltage of the red sub-pixel, and a driving voltage of the red sub-pixel is smaller than a blue sub-pixel Drive voltage.
  • the functional pattern is a p-doped hole injection layer formed between the organic light emitting layer and the anode, and includes: a first p-doped hole injection layer corresponding to the red sub-pixel a second p-doped hole injection layer corresponding to the green sub-pixel and a third p-doped hole injection layer corresponding to the blue sub-pixel;
  • a material doping concentration of the third p-doped hole injection layer is greater than a material doping concentration of the first p-doped hole injection layer, and a material doping of the first p-doped hole injection layer The concentration is greater than a material doping concentration of the second p-doped hole injection layer.
  • the p-doped hole injection layer has a material doping concentration of less than or equal to 5% by weight.
  • the forming material of the p-doped hole injection layer includes: a rubrene compound, a quinoline aluminum compound, a beryllium copper compound, an NPB compound, a TCB compound, a TNATA compound, A combination of one or any of a TPD compound, a CBP compound.
  • the doping material of the p-doped hole injection layer comprises: a combination of a cyano organic compound, C60 and its derivatives, molybdenum oxide, vanadium oxide, zirconium oxide or a combination of any of them.
  • the thickness of the first functional graphic is smaller than the thickness of the second functional graphic.
  • the sub-pixel includes a red sub-pixel, a green sub-pixel, and a blue sub-pixel, wherein a driving voltage of the green sub-pixel is smaller than a driving voltage of the red sub-pixel, and a driving voltage of the red sub-pixel is smaller than a blue sub-pixel Drive voltage.
  • the display substrate includes: a main hole transport layer disposed between the organic light emitting layer and the anode, and a auxiliary hole disposed between the main hole transport layer and the anode a transmission layer;
  • the functional pattern is the auxiliary hole transport layer, and includes: a first auxiliary hole transport layer corresponding to the red sub-pixel, a second auxiliary hole transport layer corresponding to the green sub-pixel, and a corresponding blue sub-pixel a third auxiliary hole transport layer; and the third auxiliary hole transport layer has a thickness smaller than a thickness of the first auxiliary hole transport layer, and the first auxiliary hole transport layer has a thickness smaller than the second auxiliary The thickness of the hole transport layer.
  • the thickness of the auxiliary hole transport layer is less than or equal to
  • the display substrate further includes: a hole injection layer formed between the auxiliary hole transport layer and the anode, wherein the auxiliary hole transport layer has a material doping concentration lower than the main space The material doping concentration of the hole transport layer or the hole injection layer.
  • the present disclosure also provides a display device including the above display substrate provided by the present disclosure.
  • the present disclosure adjusts the longitudinal resistance in each sub-pixel region by setting a function pattern, so that a sub-pixel having a larger driving voltage is correspondingly provided with a functional pattern having a smaller longitudinal resistance value, and a sub-pixel having a smaller driving voltage is correspondingly provided with a vertical direction.
  • a functional pattern having a large resistance value so that the driving voltage actually applied to the sub-pixels of different colors is maintained at a relatively close level.
  • the present disclosure can effectively control the lateral current leakage to adjacent other sub-pixel regions by adjusting the longitudinal resistance of the sub-pixel region, thereby effectively improving the pixel crosstalk problem.
  • FIG. 1 is a schematic structural view of a display substrate of the present disclosure
  • FIG. 2 is a schematic structural view of a display substrate according to Embodiment 1 of the present disclosure.
  • FIG. 3 is a schematic structural view of a display substrate according to Embodiment 2 of the present disclosure.
  • the present disclosure provides the following technical solution to the problem that the pixel area in the existing display device is prone to generate lateral leakage current and cause pixel crosstalk.
  • an embodiment of the present disclosure provides a display substrate, as shown in FIG. 1, comprising a substrate substrate 1, an anode 2, an organic light-emitting layer 3, and a cathode 4 sequentially formed on the substrate;
  • the display substrate further includes functional patterns A and B formed between the organic light-emitting layer 3 and the anode 2, and the functional patterns A and B are classified according to colors of a plurality of sub-pixels on the display substrate, and functional patterns of each category A and B are both set in the area of the sub-pixel of its corresponding color;
  • the driving voltages of the plurality of sub-pixels of different colors are different, and the resistance values of the functional patterns of the respective categories in the direction perpendicular to the organic light-emitting layer are different from the sub-pixels of the different colors corresponding to the functional patterns of the respective categories.
  • the driving voltage is increased and decreased.
  • the display substrate is divided into sub-pixels of a plurality of different colors, but the driving voltages of the sub-pixels of different colors are different.
  • the plurality of sub-pixels of different colors of the embodiment include at least: a first color sub-pixel and a second color sub-pixel.
  • the functional graphic includes: a first functional graphic A corresponding to the first color sub-pixel and a second functional graphic B corresponding to the second color sub-pixel.
  • a resistance value of the first functional pattern in a direction perpendicular to the organic light emitting layer and a resistance value of the second functional pattern in a direction perpendicular to the organic light emitting layer are set such that an actual value
  • the driving voltage applied to the first color sub-pixel is close to the driving voltage actually applied to the second color sub-pixel.
  • the driving voltage actually applied to the first color sub-pixel is actual
  • the ratio of the driving voltage applied to the second color sub-pixel is between 0.985 and 1.015.
  • the ratio of the driving voltage actually applied to the first color sub-pixel to the driving voltage actually applied to the second color sub-pixel is about 1.
  • the above embodiment of the present disclosure adjusts the longitudinal resistance in each sub-pixel region by setting a functional pattern.
  • the sub-pixel region with a larger driving voltage is correspondingly provided with a functional pattern having a small longitudinal resistance value, so that the current corresponding to the large driving voltage is more easily transferred in the longitudinal direction, thereby reducing the leakage current in the lateral direction.
  • a sub-pixel having a smaller driving voltage corresponds to a functional pattern having a larger longitudinal resistance value, thereby reducing leakage current in the lateral direction.
  • the scheme of the embodiment can not only maintain the driving voltage actually loaded by the sub-pixel regions of different colors at a relatively close level, but also effectively control the leakage of the lateral current to the adjacent other sub-pixel regions, thereby Solve the pixel crosstalk problem of the display.
  • the first embodiment can control the longitudinal resistance of different color sub-pixel regions by controlling the material doping concentration of different types of functional patterns.
  • the functional graphics of the present embodiment are unified into a p-doped functional graphic.
  • the material doping concentration of the first functional pattern corresponding to the first color sub-pixel is greater than the second function corresponding to the second color sub-pixel.
  • the material doping concentration of the pattern is such that the resistance value of the first functional pattern in a direction perpendicular to the organic light emitting layer is smaller than the resistance value of the second functional pattern in a direction perpendicular to the organic light emitting layer. That is, the sub-pixel of the large driving voltage corresponds to a small longitudinal resistance, thereby effectively reducing the leakage current of the lateral transmission.
  • the display substrate of the first embodiment includes a base substrate 1, an anode 2, a hole injection layer 5, a hole transport layer 6, an organic light-emitting layer 3, and an electron, which are sequentially formed on the base substrate 1.
  • the sub-pixels include a red sub-pixel R, a green sub-pixel G, and a blue sub-pixel B, and are divided into regions in accordance with the sub-pixel color in the organic light-emitting layer 3 in FIG.
  • the hole injection layer 5 (the hole injection layer 5 is a commonly used layer) is multiplexed.
  • the hole injection layer 5 includes: a first p-doped hole injection layer 51 corresponding to a red sub-pixel, a second p-doped hole injection layer 52 corresponding to a green sub-pixel, and a third corresponding to a blue sub-pixel
  • the hole injection layer 53 is p-doped.
  • the driving voltage of the green sub-pixel is smaller than the driving voltage of the red sub-pixel, and the driving voltage of the red sub-pixel is smaller than the driving voltage of the blue sub-pixel, so the material of the third p-doped hole injection layer 53 is doped.
  • the impurity concentration is greater than the material doping concentration of the first p-doped hole injection layer 51, and the material doping concentration of the first p-doped hole injection layer 51 is greater than that of the second p-doped hole injection layer 52. Doping concentration.
  • the first embodiment can use one of a rubrene compound, a quinoline aluminum compound, a beryllium copper compound, an NPB compound, a TCB compound, a TNATA compound, a TPD compound, a CBP compound or a combination of any of the above.
  • Materials are used to form p-doped hole injection layers 51, 52, 53.
  • the doping material may include a combination of one or a combination of a cyano organic compound, C60 and a derivative thereof, molybdenum oxide, vanadium oxide, zirconium oxide, and a doping concentration of less than or equal to 5% by weight.
  • a pixel of one color with the highest driving voltage may be selected as a reference.
  • the material doping concentration of the p-doped hole injection layer corresponding to three sub-pixels of red, green, and blue is adjusted to maintain the driving voltage of the three color sub-pixels actually loaded to be consistent. In essence, it adjusts the longitudinal resistance of the three color sub-pixels of red, green and blue, and achieves effective suppression of lateral leakage under the condition of ensuring sufficient hole injection capability and low driving voltage, thereby improving pixel crosstalk.
  • the second embodiment can control the longitudinal resistance of different color sub-pixel regions by controlling the thickness of different types of functional patterns.
  • the thickness of the first functional pattern corresponding to the first color sub-pixel is smaller than the second color sub-pixel.
  • the thickness of the corresponding second functional pattern is such that the resistance value of the first functional pattern in a direction perpendicular to the organic light emitting layer is smaller than the resistance value of the second functional pattern in a direction perpendicular to the organic light emitting layer. That is, the sub-pixel of the large driving voltage corresponds to a small longitudinal resistance, thereby effectively reducing the leakage current of the lateral transmission.
  • the display substrate of the second embodiment includes: a substrate substrate 1 which is sequentially formed in The anode 2 on the base substrate 1, the hole injection layer 5, the auxiliary hole transport layer 6*, the main hole transport layer 6, the organic light-emitting layer 3, the electron transport layer 7, the electron injection layer 8, and the cathode 4.
  • the sub-pixels include a red sub-pixel R, a green sub-pixel G, and a blue sub-pixel B, and are region-divided in accordance with the sub-pixel color on the organic light-emitting layer 3 in FIG.
  • the auxiliary hole transport layer 6* is multiplexed into the functional pattern of the present disclosure, and the auxiliary hole transport layer 6* includes: a first auxiliary hole transport layer 61* corresponding to the red sub-pixel, and a corresponding green sub-pixel.
  • the driving voltage of the green sub-pixel is smaller than the driving voltage of the red sub-pixel, and the driving voltage of the red sub-pixel is smaller than the driving voltage of the blue sub-pixel, so the thickness of the third auxiliary hole transport layer 63* is smaller than the first auxiliary space.
  • the thickness of the hole transport layer 61*, the thickness of the first auxiliary hole transport layer 61* is smaller than the thickness of the second auxiliary hole transport layer 62*.
  • the auxiliary hole transport layer 6* of the second embodiment can be made of a low mobility material (such as a PVK compound, a quinoline aluminum compound), and the thickness is less than or equal to It is appropriate. Further, the material doping concentration of the auxiliary hole transport layer 6* is preferably lower than the material doping concentration of the main hole transport layer 6 or the hole injection layer 5 to achieve a stable pixel driving effect.
  • a low mobility material such as a PVK compound, a quinoline aluminum compound
  • the second embodiment can select a pixel of one color with the highest driving voltage as a reference, and adjust the thickness of the auxiliary hole transport layer 6 corresponding to three sub-pixels of red, green, and blue, thereby making the three
  • the driving voltage values actually loaded by the color sub-pixels are close to being uniform. It is essentially equivalent to adjusting the longitudinal resistance of the three color sub-pixels, and effective suppression of lateral leakage is achieved while ensuring sufficient hole injection capability and low driving voltage, thereby improving pixel crosstalk.
  • the solutions of the first embodiment and the second embodiment only need to be slightly modified to the existing substrate manufacturing process, and the production cost is not significantly increased.
  • the need to reduce the driving voltage and power consumption can be further achieved, that is, at least one sub-pixel is guaranteed to be in an optimized low-power state, and other sub-pixels can consume power as much as possible without satisfying pixel crosstalk. reduce.
  • the description that needs to be given is that the first embodiment and the second embodiment are used to exemplarily introduce the scheme of controlling the longitudinal resistance of the sub-pixel in the embodiment.
  • the embodiment can also simultaneously control the thickness of the functional pattern and the material doping concentration to achieve the resistance of the functional pattern in a direction perpendicular to the organic light emitting layer, thereby controlling the resistance of the sub-pixel.
  • embodiments of the present disclosure also provide a display device including the disclosure provided by the present disclosure.

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Abstract

提供一种显示基板及显示装置。显示基板包括：衬底基板（1），依次形成在衬底基板（1）上的阳极（2）、有机发光层（3）和阴极（4）；其中显示基板还包括形成在有机发光层（3）与阳极（2）之间的功能图形（A,B），功能图形（A,B）根据多个子像素的颜色划分类别，且每一类别的功能图形（A,B）均设置在其对应颜色的子像素的区域内；多个不同颜色的子像素的驱动电压不同，并且各类别的功能图形（A,B）在垂直有机发光层（3）的方向上的电阻值随着各类别的功能图形（A,B）所对应的不同颜色的子像素的驱动电压的增大而减小。

Description

一种显示基板及显示装置
相关申请的交叉参考
本申请主张在2017年3月15日在中国提交的中国专利申请号No.201710152992.3的优先权，其全部内容通过引用包含于此。
技术领域
本公开涉及显示领域，特别是涉及一种显示基板及显示装置。
背景技术
在现有OLED显示领域中，为了降低阳极与有机层之间的界面势垒，通常会对空穴传输层进行p-型掺杂。这导致提高了OLED的空穴的注入能力，以及降低驱动电压和功耗。
但是，p-型掺杂在降低驱动电压的同时，会导致图层横向电阻也显著降低。因此，在OLED通电之后很容易产生横向电流。这种情况导致了在点亮某个纵向电阻略大的子像素时，其电路更趋于横向传输，从而使相邻的其他纵向电阻小一些的子像素也会同时被点亮。这种现象称为子像素偷亮，宏观上表现为像素串扰。这会导致色纯度降低，功耗增加，显示画质降低等不利后果。
发明内容
本公开的目的是提供能够解决现有显示装置的像素串扰问题的OLED显示基板和显示装置。
一方面，本公开的实施例提供一种显示基板，包括：衬底基板，依次形成在所述衬底基板上的阳极、有机发光层和阴极；
其中，所述显示基板还包括形成在所述有机发光层与所述阳极之间的功能图形，所述功能图形根据多个子像素的颜色划分类别，且每一类别的功能图形均设置在其对应颜色的子像素的区域内；以及
所述多个不同颜色的子像素的驱动电压不同，并且各类别的功能图形在 垂直于所述有机发光层的方向上的电阻值随着各类别的功能图形所对应的不同颜色的子像素的驱动电压的增大而减小。
可选择地，所述多个不同颜色的子像素包括第一颜色子像素和第二颜色子像素，所述功能图形包括对应第一颜色子像素的第一功能图形和对应第二颜色子像素的第二功能图形，所述第一颜色子像素的驱动电压大于所述第二颜色子像素的驱动电压，所述第一功能图形在垂直于所述有机发光层的方向上的电阻值小于所述第二功能图形在垂直于所述有机发光层的方向上的电阻值。
可选择地，所述第一功能图形在垂直于所述有机发光层的方向上的电阻值和所述第二功能图形在垂直于所述有机发光层的方向上的电阻值被选择为使得第一颜色子像素的实际驱动电压与所述第二颜色子像素的实际驱动电压相接近。
可选择地，第一颜色子像素的实际驱动电压与所述第二颜色子像素的实际驱动电压之比在0.985～1.015之间。
可选择地，所述功能图形为p-掺杂功能图形，所述第一功能图形的材料掺杂浓度大于所述第二功能图形的材料掺杂浓度。
可选择地，所述子像素包括红色子像素、绿色子像素和蓝色子像素；其中，绿色子像素的驱动电压小于红色子像素的驱动电压，红色子像素的驱动电压小于蓝色子像素的驱动电压。
可选择地，所述功能图形为形成在所述有机发光层与所述阳极之间的p-掺杂空穴注入层，并且包括：对应红色子像素的第一p-掺杂空穴注入层、对应绿色子像素的第二p-掺杂空穴注入层以及对应蓝色子像素的第三p-掺杂空穴注入层；以及
所述第三p-掺杂空穴注入层的材料掺杂浓度大于第一p-掺杂空穴注入层的材料掺杂浓度，所述第一p-掺杂空穴注入层的材料掺杂浓度大于所述第二p-掺杂空穴注入层的材料掺杂浓度。
可选择地，p-掺杂空穴注入层的材料掺杂浓度小于或等于5wt％。
可选择地，所述p-掺杂空穴注入层的形成材料包括：红荧烯化合物、喹啉铝化合物、酞箐铜化合物、NPB化合物、TCB化合物、TNATA化合物、 TPD化合物、CBP化合物中的一者或任意几者的组合。
可选择地，所述p-掺杂空穴注入层的掺杂材料包括：氰基有机化合物、C60及其衍生物、氧化钼、氧化钒、氧化锆中的一者或任意几者的组合。
可选择地，所述第一功能图形的厚度小于所述第二功能图形的厚度。
可选择地，所述子像素包括红色子像素、绿色子像素和蓝色子像素，其中，绿色子像素的驱动电压小于红色子像素的驱动电压，红色子像素的驱动电压小于蓝色子像素的驱动电压。
可选择地，所述显示基板包括：设置在所述有机发光层与所述阳极之间的主空穴传输层，以及设置在所述主空穴传输层与所述阳极之间的辅空穴传输层；所述功能图形为所述辅空穴传输层，并且包括：对应红色子像素的第一辅空穴传输层、对应绿色子像素的第二辅空穴传输层以及对应蓝色子像素的第三辅空穴传输层；以及所述第三辅空穴传输层厚度小于所述第一辅空穴传输层的厚度，所述第一辅空穴传输层的厚度小于所述第二辅空穴传输层的厚度。
可选择地，所述辅空穴传输层的厚度为小于或等于
Figure PCTCN2017103941-appb-000001
可选择地，所述显示基板还包括：形成在所述辅空穴传输层与所述阳极之间的空穴注入层，所述辅空穴传输层的材料掺杂浓度低于所述主空穴传输层或所述空穴注入层的材料掺杂浓度。
另一方面，本公开还提供一种显示装置，包括有本公开提供的上述显示基板。
至少一种上述的本公开的方案具有如下有益效果：
本公开通过设置功能图形，来调整各子像素区域内的纵向电阻，使得驱动电压较大的子像素对应设置有纵向电阻值较小的功能图形，而驱动电压较小的子像素对应设置有纵向电阻值较大的功能图形，从而对不同颜色的子像素实际施加的驱动电压维持在比较接近的水平。而且，本公开通过调整子像素区域的纵向电阻，可以有效控制横向电流漏到相邻其他的子像素区域，有效改善了像素串扰问题。
附图说明
图1为本公开的显示基板的结构示意图；
图2为根据本公开的实施例一的显示基板的结构示意图。
图3为根据本公开的实施例二的显示基板的结构示意图。
具体实施方式
为使本公开要解决的技术问题、技术方案和优点更加清楚，下面将结合附图及具体实施例进行详细描述。
针对现有显示装置中像素区域容易产生横向漏电流而导致像素串扰的问题，本公开提供如下技术方案。
一方面，本公开的实施例提供一种显示基板，如图1所示，包括衬底基板1，依次形成在衬底基板上的阳极2、有机发光层3和阴极4；
所述显示基板还包括形成在有机发光层3与阳极2之间的功能图形A、B，该功能图形A、B根据显示基板上的多个子像素的颜色划分类别，且每一类别的功能图形A、B均设置在其对应颜色的子像素的区域内；
所述多个不同颜色的子像素的驱动电压不同，并且各类别的功能图形在垂直于所述有机发光层的方向上的电阻值随着各类别的功能图形所对应的不同颜色的子像素的驱动电压的增大而减小。
与常见的OLED显示装置一样，显示基板划分有多种不同颜色的子像素，但不同颜色的子像素的驱动电压不同。
如图1所示，该实施例的多个不同颜色的子像素至少包括：第一颜色子像素和第二色子像素。功能图形包括：对应于第一颜色子像素的第一功能图形A和对应第二色子像素的第二功能图形B。当第一颜色子像素的驱动电压大于第二色子像素的驱动电压，第一功能图形A在垂直于有机发光层3的方向上的电阻值小于第二功能图形B在垂直于有机发光层3的方向上的电阻值。可选地，所述第一功能图形在垂直于所述有机发光层的方向上的电阻值和所述第二功能图形在垂直于所述有机发光层的方向上的电阻值被设置为使得实际施加于第一颜色子像素的驱动电压与实际施加于所述第二色子像素的驱动电压相接近。进一步可选地，实际施加于第一颜色子像素的驱动电压与实际 施加于所述第二色子像素的驱动电压之比在0.985～1.015之间。优选实际施加于第一颜色子像素的驱动电压与实际施加于所述第二色子像素的驱动电压之比约为1。
本公开的上述实施例通过设置功能图形，来调整各子像素区域内的纵向电阻。驱动电压较大的子像素区域对应设置有纵向电阻值较小的功能图形，使得大驱动电压下所对应的电流更易于纵向传输，从而降低横向上的漏电流。相比之下，驱动电压较小的子像素则对应设置有纵向电阻值较大的功能图形，从而降低横向上的漏电流。
由以上可见：本实施例的方案不仅可以将不同颜色子像素区域所实际加载的驱动电压维持在比较接近的水准上，同时又可以有效控制横向电流漏到相邻其他的子像素区域上，从而解决显示画面的像素串扰问题。
下面结合不同的具体实现方式，对本实施例如何调整子像素区域的纵向电阻的方案进行进一步详细介绍。
实施方式一
本实施方式一可以通过控制不同类别的功能图形的材料掺杂浓度，从而控制不同颜色子像素区域的纵向电阻。
作为示例性介绍，本实施例的功能图形统一为p-掺杂功能图形。
假设第一颜色子像素的驱动电压大于第二色子像素的驱动电压，则第一颜色子像素所对应的第一功能图形的材料掺杂浓度要大于第二色子像素所对应的第二功能图形的材料掺杂浓度，使得第一功能图形在垂直于有机发光层的方向上的电阻值小于第二功能图形在垂直于所述有机发光层的方向上的电阻值。即：大驱动电压的子像素对应较小的纵向电阻，从而有效降低横向传输的漏电流。
如图2所示，本实施方式一的显示基板包括：衬底基板1，依次形成在衬底基板1上的阳极2、空穴注入层5、空穴传输层6、有机发光层3、电子传输层7、电子注入层8以及阴极4。子像素包括：红色子像素R、绿色子像素G和蓝色子像素B，并在图2中的有机发光层3中按照子像素颜色进行区域划分。
本实现方式一将空穴注入层5(空穴注入层5为常见使用的图层)复用 为本公开的功能图形。该空穴注入层5包括：对应红色子像素的第一p-掺杂空穴注入层51、对应绿色子像素的第二p-掺杂空穴注入层52以及对应蓝色子像素的第三p-掺杂空穴注入层53。
在本实施例中，绿色子像素的驱动电压小于红色子像素的驱动电压，红色子像素的驱动电压小于蓝色子像素的驱动电压，因此第三p-掺杂空穴注入层53的材料掺杂浓度大于第一p-掺杂空穴注入层51的材料掺杂浓度，第一p-掺杂空穴注入层51的材料掺杂浓度大于第二p-掺杂空穴注入层52的材料掺杂浓度。
经实践证明，本实现方式一可以使用红荧烯化合物、喹啉铝化合物、酞箐铜化合物、NPB化合物、TCB化合物、TNATA化合物、TPD化合物、CBP化合物中的一者材料或任意几者的组合材料来形成p-掺杂空穴注入层51、52、53。此外，掺杂材料可以包括：氰基有机化合物、C60及其衍生物、氧化钼、氧化钒、氧化锆中的一者或任意几者的组合，掺杂浓度以小于或等于5wt％为宜。
在具体实施时，本实施方式一可以选取驱动电压最高的一种颜色的像素作为基准。调节对应于红、绿、蓝是三种子像素的p-掺杂空穴注入层的材料掺杂浓度，以维持三种颜色子像素实际加载的驱动电压趋近于一致。其本质上是调节红、绿、蓝三种颜色子像素的纵向电阻，在保证足够的空穴注入能力和低驱动电压的情况下，实现横向漏流的有效抑制，从而改善像素串扰。
实施方式二
本实施例二可以通过控制不同类别的功能图形的厚度，从而控制不同颜色子像素区域的纵向电阻。
作为示例性介绍，假设本实施例的第一颜色子像素的驱动电压大于第二色子像素的驱动电压，则第一颜色子像素所对应的第一功能图形的厚度要小于第二色子像素所对应的第二功能图形的厚度，从而使得第一功能图形在垂直于有机发光层的方向上的电阻值小于第二功能图形在垂直于有机发光层的方向上的电阻值。即：大驱动电压的子像素对应较小的纵向电阻，从而有效降低横向传输的漏电流。
如图3所示，本实施方式二的显示基板包括：衬底基板1，依次形成在 衬底基板1上的阳极2、空穴注入层5、辅空穴传输层6*、主空穴传输层6、有机发光层3、电子传输层7、电子注入层8以及阴极4。子像素包括：红色子像素R、绿色子像素G和蓝色子像素B，并在图3中的有机发光层3上按照子像素颜色进行区域划分。
本实施方式二将辅空穴传输层6*复用为本公开的功能图形，该辅空穴传输层6*包括：对应红色子像素的第一辅空穴传输层61*、对应绿色子像素的第二辅空穴传输层62*以及对应蓝色子像素的第三辅空穴传输层63*。
在本实施例中绿色子像素的驱动电压小于红色子像素的驱动电压，红色子像素的驱动电压小于蓝色子像素的驱动电压，因此第三辅空穴传输层63*厚度小于第一辅空穴传输层61*的厚度，第一辅空穴传输层61*的厚度小于第二辅空穴传输层62*的厚度。
经实践证明，实施方式二的辅空穴传输层6*可以采用低迁移率材料(如PVK化合物、喹啉铝类化合物)制成，且厚度以小于或等于
Figure PCTCN2017103941-appb-000002
为宜。此外，辅空穴传输层6*的材料掺杂浓度优选低于主空穴传输层6或空穴注入层5的材料掺杂浓度，以实现稳定的像素驱动效果。
在具体实施时，本实施方式二可以选取驱动电压最高的一种颜色的像素作为基准，调节对应于红、绿、蓝是三种子像素的辅空穴传输层6的厚度，从而使该三种颜色子像素实际加载的驱动电压值趋近于一致。其本质上相当于调节三种颜色子像素的纵向电阻，在保证足够的空穴注入能力和低驱动电压的情况下，实现横向漏流的有效抑制，从而改善像素串扰。
可见，实施方式一和实施方式二的方案只需要对现有基板制作工艺流程稍作更改即可实现，不会明显增加生产成本。此外，还可以进一步实现降低驱动电压和功耗的需求，即保证至少一种子像素处于最优化的低功耗状态、且其他子像素在满足不发生像素串扰的前提下，将功耗尽可能的降低。
此外，需要给予的说明是，以上实施方式一和实施方式二用于示例性介绍本实施例控制子像素纵向电阻的方案。作为其他可行方案，本实施例还可以同时控制功能图形的厚度以及材料掺杂浓度以实现功能图形在垂直于有机发光层的方向上的电阻大小，进而控制子像素的电阻大小。
另一方面，本公开的实施例还提供一种显示装置，包括有本公开所提供 的上述实施方式一或实施方式二的显示基板。显然，基于该显示基板的设计，本实施例的显示装置有效解决了像素串扰的问题，从而能够显示色纯度更高的显示画面，提升了用户的体验。
以上所述是本公开的可选实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本公开所述原理的前提下，还可以作出若干改进和润饰，这些改进和润饰也应视为本公开的保护范围。

Claims (16)

  1. 一种显示基板，包括衬底基板，依次形成在所述衬底基板上的阳极、有机发光层和阴极，
    其中，所述显示基板还包括形成在所述有机发光层与所述阳极之间的功能图形，所述功能图形根据多个子像素的颜色划分类别，且每一类别的功能图形均设置在其对应颜色的子像素的区域内；
    其中，多个不同颜色的子像素的驱动电压不同，并且各类别的功能图形在垂直于所述有机发光层的方向上的电阻值随着各类别的功能图形所对应的不同颜色的子像素的驱动电压的增大而减小。
  2. 根据权利要求1所述的显示基板，其中，所述多个不同颜色的子像素包括第一颜色子像素和第二颜色子像素，所述功能图形包括对应第一颜色子像素的第一功能图形和对应第二颜色子像素的第二功能图形，所述第一颜色子像素的驱动电压大于所述第二颜色子像素的驱动电压，所述第一功能图形在垂直于所述有机发光层的方向上的电阻值小于所述第二功能图形在垂直于所述有机发光层的方向上的电阻值。
  3. 根据权利要求2所述的显示基板，其中，所述第一功能图形在垂直于所述有机发光层的方向上的电阻值和所述第二功能图形在垂直于所述有机发光层的方向上的电阻值被设置为使得实际施加于第一颜色子像素的驱动电压与实际施加于所述第二颜色子像素的驱动电压相接近。
  4. 根据权利要求2所述的显示基板，其中，实际施加于第一颜色子像素的驱动电压与实际施加于所述第二颜色子像素的驱动电压之比在0.985～1.015之间。
  5. 根据权利要求2-4中任一项所述的显示基板，其中，所述功能图形为p-掺杂的功能图形，所述第一功能图形的材料掺杂浓度大于所述第二功能图形的材料掺杂浓度。
  6. 根据权利要求1所述的显示基板，其中，所述子像素包括红色子像素、绿色子像素和蓝色子像素，并且绿色子像素的驱动电压小于红色子像素的驱动电压，红色子像素的驱动电压小于蓝色子像素的驱动电压；
    所述功能图形为形成在所述有机发光层与所述阳极之间的p-掺杂空穴注入层，并且包括：对应红色子像素的第一p-掺杂空穴注入层、对应绿色子像素的第二p-掺杂空穴注入层以及对应蓝色子像素的第三p-掺杂空穴注入层；以及
    所述第三p-掺杂空穴注入层的材料掺杂浓度大于第一p-掺杂空穴注入层的材料掺杂浓度，所述第一p-掺杂空穴注入层的材料掺杂浓度大于所述第二p-掺杂空穴注入层的材料掺杂浓度。
  7. 根据权利要求5或6所述的显示基板，其中，p-掺杂空穴注入层的材料掺杂浓度小于或等于5wt％。
  8. 根据权利要求5-7中任一项所述的显示基板，其中，所述p-掺杂空穴注入层的形成材料包括：红荧烯化合物、喹啉铝化合物、酞箐铜化合物、NPB化合物、TCB化合物、TNATA化合物、TPD化合物、CBP化合物中的一者或任意几者的组合；以及
    所述p-掺杂空穴注入层的掺杂材料包括：氰基有机化合物、C60及其衍生物、氧化钼、氧化钒、氧化锆中的一者或任意几者的组合。
  9. 根据权利要求2-4中任一项所述的显示基板，其中，所述第一功能图形的厚度小于所述第二功能图形的厚度。
  10. 根据权利要求1所述的显示基板，其中，所述子像素包括红色子像素、绿色子像素和蓝色子像素，并且绿色子像素的驱动电压小于红色子像素的驱动电压，红色子像素的驱动电压小于蓝色子像素的驱动电压；
    所述显示基板包括：设置在所述有机发光层与所述阳极之间的主空穴传输层、以及设置在所述主空穴传输层与所述阳极之间的辅空穴传输层；
    所述功能图形为所述辅空穴传输层，包括：对应红色子像素的第一辅空穴传输入层、对应绿色子像素的第二辅空穴传输层以及对应蓝色子像素的第三辅空穴传输层；以及
    所述第三辅空穴传输层厚度小于所述第一辅空穴传输层的厚度，所述第一辅空穴传输层的厚度小于所述第二辅空穴传输层的厚度。
  11. 根据权利要求10所述的显示基板，其中，所述辅空穴传输层的厚度为小于或等于
    Figure PCTCN2017103941-appb-100001
  12. 根据权利要求10或11所述的显示基板，其中，所述显示基板还包括形成在所述辅空穴传输层与所述阳极之间的空穴注入层，所述辅空穴传输层的材料掺杂浓度低于所述主空穴传输层或所述空穴注入层的材料掺杂浓度。
  13. 根据权利要求1所述的显示基板，其中，各类别功能图形的厚度和p-型材料的掺杂浓度同时被设置为使得各类别的功能图形在垂直于有机发光层的方向上的电阻值随着各类别功能图形所对应的不同颜色的子像素的驱动电压的增加而减小。
  14. 根据权利要求13所述的显示基板，其中，各类别功能图形中p-型掺杂材料的掺杂浓度小于或等于5wt％，且各类别功能图形的厚度小于或等于
    Figure PCTCN2017103941-appb-100002
  15. 一种显示面板，包括权利要求1-12中任一项所述的显示基板。
  16. 一种显示装置，包括权利要求15所述的显示面板。
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