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A kind of oled device and its preparation method, display device

A device and the same technology, applied in the fields of OLED devices and their preparation methods, and display devices, can solve problems such as redness, and achieve the effects of improving luminous efficiency, avoiding poor redness at low gray levels, and reducing turn-on voltage difference.

Active Publication Date: 2020-02-28
BOE TECH GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims at the existing problem that reddening occurs easily when the voltage at both ends of the OLED device is lower than the turn-on voltage of the green pixel at a lower gray scale, and provides an OLED device, a preparation method thereof, and a display device

Method used

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  • A kind of oled device and its preparation method, display device
  • A kind of oled device and its preparation method, display device
  • A kind of oled device and its preparation method, display device

Examples

Experimental program
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Embodiment 1

[0032] This embodiment provides an OLED device, such as figure 1 As shown, it includes a plurality of pixels, each pixel includes a plurality of sub-pixels of different colors, and each sub-pixel includes a first electrode 1, a second electrode 2, and an electrode sandwiched between the first electrode 1 and the second electrode 2 Between the luminescent material layer 3 of each sub-pixel, a hole injection layer 4 is provided between the luminescent material layer 3 and the first electrode 1, and the hole injection layer 4 between the luminescent material layer 3 of some sub-pixels and the first electrode 1 The number of layers is less than the number of hole injection layers between the light-emitting material layer 3 and the first electrode 1 of other sub-pixels, so as to reduce the turn-on voltage difference of sub-pixels of different colors.

[0033] The number of hole injection layers can also be understood as the type of hole injection layer material, that is, hole injec...

Embodiment 2

[0036] This embodiment provides an OLED device, which includes a plurality of pixels, each pixel includes a red sub-pixel, a green sub-pixel, and a blue sub-pixel, and each sub-pixel includes a first electrode 1, a second electrode 2, and a The luminescent material layer 3 between the first electrode 1 and the second electrode 2, a hole injection layer 4 is provided between the luminescent material layer 3 of each sub-pixel and the first electrode 1, and the luminescent material of the red sub-pixel The number of hole injection layers between the layer 3 and the first electrode 1 is less than the number of hole injection layers between the light-emitting material layer 3 of the green sub-pixel and the blue sub-pixel and the first electrode 1, so as to reduce the difference between different colors. The turn-on voltage difference of the sub-pixel.

[0037] In the appendix corresponding to this embodiment figure 2 In the figure, the hole injection layer 4, the luminescent mate...

Embodiment 3

[0047] This embodiment provides a figure 2 The preparation method of shown OLED device, comprises the following steps:

[0048] S01. Sputtering an anode conductive film on the substrate, and forming a pattern including the anode (that is, the first electrode) through a patterning process. The anode usually uses inorganic metal oxides (such as: indium tin oxide ITO, zinc oxide ZnO, etc.), organic conductive polymers (such as: poly 3,4-ethylenedioxythiophene / polystyrene sulfonate PEDOT: PSS, poly Aniline PANI, etc.) or high work function metal materials (such as: gold, copper, silver, platinum, etc.). The thickness of the anode ranges from 10 to 200 nm.

[0049] S02, forming a hole injection layer 4; wherein, the number of hole injection layers between the luminescent material layer 3 and the first electrode 1 of some sub-pixels is less than that between the luminescent material layer 3 and the first electrode 1 of other sub-pixels The number of hole injection layers to re...

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Abstract

The invention provides an OLED device, a preparation method thereof, and a display device, which belong to the field of OLED display technology, and can solve the existing problem that the voltage at both ends of the OLED device is lower than the turn-on voltage of the green pixel at a lower gray scale. The problem of the red phenomenon. In the OLED device of the present invention, the number of hole injection layers between the light-emitting material layer and the first electrode of some sub-pixels is less than the number of hole injection layers between the light-emitting layer and the first electrode of other sub-pixels, which can not only reduce the The turn-on voltage difference of the sub-pixels of different colors can also improve the luminous efficiency of the device. It is equivalent to effectively adjusting the difference in the turn-on voltage of the multi-color light of the device, so as to avoid the phenomenon of low gray-scale redness and the like. The OLED device of the present invention is applicable to various display devices.

Description

technical field [0001] The invention belongs to the technical field of OLED display, and in particular relates to an OLED device, a preparation method thereof, and a display device. Background technique [0002] Usually, in an organic light emitting diode (Organic Light Emitting Diode, OLED) display device, R, G, B light-emitting pixels have the same device structure, and the light-emitting materials in the light-emitting material layers of different color pixels are excited to emit R, G, B The order of energy required by the three colors of light is ν R <ν G <ν B . [0003] The inventors have found that there are at least the following problems in the prior art: when R, G, and B have the same structure, the turn-on voltages of each color are different, and generally V R <V G <V B . This will cause the OLED device to light up at a lower gray scale, for example, when the voltage difference across the device is lower than V G , redness appears. With the co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L51/50H01L51/56H01L27/32
CPCH10K59/00H10K50/17H10K50/11H10K2101/10H10K71/00H10K59/35H10K50/18H10K50/15H10K50/852H10K2102/351H10K50/81H10K50/82H10K2101/40H10K2101/30H10K2102/103
Inventor 李锡平孙文
Owner BOE TECH GRP CO LTD
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