Organic light emitting diode device and preparation method thereof, display substrate and display device

A technology of light-emitting diodes and display substrates, which is applied in semiconductor/solid-state device manufacturing, semiconductor devices, electric solid-state devices, etc., and can solve problems such as poor mura, smaller color gamut of panels, and reddish white screens, etc.

Pending Publication Date: 2020-10-20
BOE TECH GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Current OLED display products are prone to various mura defects at low current densities
In addition, at low gray levels, monochrome light-emitting pixel

Method used

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  • Organic light emitting diode device and preparation method thereof, display substrate and display device
  • Organic light emitting diode device and preparation method thereof, display substrate and display device
  • Organic light emitting diode device and preparation method thereof, display substrate and display device

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Embodiment Construction

[0045] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0046] Since the brightness of the OLED device is determined by the current of the OLED device, the control of the current by the drive transistor DTFT will directly affect the luminous intensity of the OLED screen. As the resolution of OLED screens is getting higher and higher, the pixel light-emitting area is getting smaller and smaller. Under the condition that the brightness of the screen remains unchanged, the current of each pixel will become smaller and smaller, especially in extremely low grayscale. current. The smaller the current, the more difficult it is to precisely control the driving transistor DTFT. Therefore, various mura defects will occur on the OLED screen at low gray levels. In addition, when the screen is in ...

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Abstract

The application provides an organic light emitting diode device and a preparation method thereof, a display substrate and a display device. The organic light-emitting diode device comprises a substrate, an anode layer, an organic functional layer and a cathode layer, and the anode layer, the organic functional layer and the cathode layer are stacked on one side of the substrate; the organic functional layer comprises a first functional layer, a second functional layer and a light-emitting layer which are stacked, and the first functional layer is arranged close to the anode layer; the HOMO energy level of the second functional layer is deeper than the HOMO energy levels of the first functional layer and a light-emitting layer host material. According to the technical scheme, the second functional layer material with the relatively deep HOMO energy level is arranged; a hole blocking barrier is formed at the interface of the first functional layer 11 and the second functional layer 12 and thus the light-emitting efficiency of the organic light-emitting diode device under extremely low current is extremely low, so that the picture quality of an OLED under extremely low gray scale andlow brightness can be improved, the influence of leakage current on the picture quality can be reduced, and the problem of crosstalk between pixels is solved.

Description

technical field [0001] The invention relates to the field of display technology, in particular to an organic light emitting diode device and a preparation method thereof, a display substrate, and a display device. Background technique [0002] Compared with LCD screens, OLED (Organic Light-Emitting Diode) screens have advantages such as bendability and high contrast, and more and more panel manufacturers are beginning to pay attention to or invest in this field. However, the display principle of the OLED screen is very different from that of the LCD screen. Such as figure 1 As shown, holes are injected from the anode, electrons are injected from the cathode, and the electrons and holes recombine in the light-emitting layer to emit light. Therefore, the brightness of the OLED screen is controlled by the current of the OLED device at the pixel point. [0003] Current OLED display products are prone to various mura defects at low current densities. In addition, at low gray l...

Claims

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Application Information

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IPC IPC(8): H01L51/50H01L51/56H01L27/32
CPCH10K59/35H10K50/11H10K2101/40H10K50/18H10K71/00H10K50/852H10K50/86H10K71/166H10K2101/30Y02E10/549H10K2102/311H10K59/1201H10K2102/351H10K77/111H10K71/164H10K59/12
Inventor 张伟孔超杨一帆陈龙戴灵均袁德
Owner BOE TECH GRP CO LTD
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