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Organic electroluminescent device

An electroluminescence device and luminescence technology, applied in circuits, electrical components, electrical solid devices, etc., can solve the problems of color shift, low luminous brightness of red sub-pixels and green sub-pixels, achieve mature technology and reduce lateral migration , Enhance the effect of the partition effect

Active Publication Date: 2018-12-11
YUNGU GUAN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In practical applications, when the blue sub-pixel is turned on, although the voltage is mainly across the blue sub-pixel, due to the better conductivity of the hole injection layer, part of the voltage will migrate to the green sub-pixel through the hole injection layer. And / or in the red sub-pixel, since the turn-on voltages of the red sub-pixel and the green sub-pixel are lower than the turn-on voltage of the blue sub-pixel, the red sub-pixel and / or the green sub-pixel are easy to be turned on at the same time
That is, in the case of low gray scale, the luminous brightness of the red sub-pixel and / or green sub-pixel cannot strictly meet the requirements to achieve the low-brightness display effect, and the low gray scale color cast (reddish) phenomenon occurs

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0053] This embodiment provides an organic electroluminescent device, such as Figure 4 As shown, it includes a pixel defining layer 1 disposed on a substrate 3 , and a groove 11 for accommodating a sub-pixel unit is opened in the pixel defining layer 1 . In the organic electroluminescent device provided in this embodiment,

[0054] The device structure of the red sub-pixel unit is: ITO(10nm) / Ag(100nm) / ITO(10nm) / CuPc(20nm) / TPD(200nm) / CBP:Ir(piq) 3 (3%, 30nm) / TPBi(40nm) / LiF(1nm) / Mg:Ag(20%, 15nm) / NPB(60nm);

[0055] The device structure of the green photosub-pixel unit is: ITO(10nm) / Ag(100nm) / ITO(10nm) / CuPc(20nm) / TPD(150nm) / CBP:Ir(ppy) 3 (10%, 30nm) / TPBi(40nm) / LiF(1nm) / Mg:Ag(20%, 15nm) / NPB(60nm);

[0056] The blue light sub-pixel unit device structure is: ITO(10nm) / Ag(100nm) / ITO(10nm) / CuPc(20nm) / TPD(120nm) / CBP: Firpic(3%,30nm) / TPBi(40nm) / LiF( 1nm) / Mg:Ag(20%,15nm) / NPB(60nm);

[0057] The pixel definition layer 1 is polyvinyl alcohol, and the static contact angle between poly...

Embodiment 2

[0059] This embodiment provides an organic electroluminescent device, the structure of which is the same as that of Embodiment 1, except that figure 2 As shown, the longitudinal section of the pixel defining layer 11 is a regular trapezoid, the side length of the upper and lower bottom surfaces is 22um, the height is 1.5um, and the angle between the bottom surfaces is 150°.

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Abstract

The invention relates to the technical field of display and discloses an organic electroluminescent device, comprising a pixel defining layer arranged on a substrate, wherein a plurality of grooves for accommodating sub-pixel units are provided in the pixel defining layer, and the pixel defining layer and the sub-pixel units are contacted viaa hydrophilic surface. As that carry functional layer isusually an organic compound contain lipophilic and hydrophobic groups such as hydrocarbon groups or aromatic groups, the carry functional layer is easy to grow in an island mode on the hydrophilic surface, i. e., the carrier functional layer forms a discontinuous thin film structure on the surface of the pixel limiting layer. Therefore, when a sub-pixel unit of a certain light emitting color is turned on, carriers applied to the sub-pixel unit do not migrate to sub-pixel units of adjacent other light emitting colors via a carrier functional layer, thereby avoiding sub-pixel units of other colors from being simultaneously lit up, and effectively solving the color deviation problem at low brightness.

Description

technical field [0001] The invention relates to the field of display technology, in particular to an organic electroluminescent device. Background technique [0002] Organic electroluminescent display (English full name Organic Light Emitting Display, referred to as OLED) is an active light emitting display device, because it has the advantages of simple preparation process, low cost, high contrast, wide viewing angle, low power consumption, etc. Large-screen display, easy to match with integrated circuit drivers, easy to realize flexible display and other advantages, is expected to become the mainstream flat panel display technology of the next generation, and is one of the most concerned technologies in flat panel display technology at present. [0003] figure 1 The voltage-brightness curves of the RGB three-color sub-pixels in the existing full-color display device are shown. It can be seen from the figure that in the existing OLED display device, the turn-on voltages o...

Claims

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Application Information

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IPC IPC(8): H01L27/32
CPCH10K59/35H10K59/122
Inventor 周小康李梦真何麟李维维杨鹤刘彬
Owner YUNGU GUAN TECH CO LTD
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