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Organic light-emitting diode (OLED) with improved light extraction and corresponding display unit

A technology of light-emitting diodes and organic light-emitting layers, which is applied in the field of display devices, manufacturing signal lights and display devices, can solve the problems of not being able to fully improve light extraction efficiency, and achieve the effect of reducing costs

Inactive Publication Date: 2009-10-28
INTERDIGITAL CE PATENT HLDG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method to improve the light extraction efficiency still cannot sufficiently improve the light extraction efficiency

Method used

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  • Organic light-emitting diode (OLED) with improved light extraction and corresponding display unit
  • Organic light-emitting diode (OLED) with improved light extraction and corresponding display unit
  • Organic light-emitting diode (OLED) with improved light extraction and corresponding display unit

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Embodiment Construction

[0078] exist figure 1 In the organic light-emitting diode (OLED) concerned, the light exit face is the front face, ie the face on the side opposite to the substrate on which the diode is built. On the substrate 2 on the back side, the OLED diode 1 comprises at least one back electrode 3 of the first type (anode or cathode), which also has light-reflecting properties to reflect light towards the exit face and form a reflector mechanism . The back electrode 3, called reflective electrode, is metallic and overlaid with a light emitting organic layer 4 which may comprise sub-layers. The light-emitting organic layer 4 is finally covered by an embossed transparent organic layer 5. The embossed transparent organic layer 5 has a concave-convex pattern in a periodic regular arrangement, and the pattern forms a basic prism structure. The front surface of the prism structure supports a Substantially transparent electrodes 6 of the second front type (cathode or anode respectively with r...

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PUM

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Abstract

The invention relates to an organic light-emitting diode (1) comprising at least one so-called back electrode (3) of a first type on a substrate in order from the back to the front, an organic light-emitting layer covering said back electrode (4) and at least one so-called front electrode (6) of a second type covering said organic emitting layer, when holes and electrons are injected into it by an electric current flowing through said electrode, said organic emitting A layer generates light, said electrode type corresponds to an anode and a cathode, at least one of said electrodes being substantially transparent to the light generated, allowing it to exit through a face of the diode called the exit face. According to the invention, said substantially transparent electrode comprises at least one transparent extraction zone and at least one reflective zone for re-passing said generated light through said light-emitting layer, and said diode further comprises a reflector means, said reflector means being disposed on an opposite side of said substantially transparent electrode from said organic emissive layer, for returning said generated light through said emissive layer to said substantially transparent electrode. The diodes may be constructed by embossing, various embodiments are described herein.

Description

technical field [0001] The present invention relates to an organic light emitting diode (OLED) with improved light extraction efficiency, and to a corresponding display device. It is used in the field of optoelectronics, especially in the manufacture of signal lamps and display devices. Background technique [0002] Organic Light Emitting Diodes (OLEDs) are under significant development. Like conventional light-emitting diodes (LEDs) before them, organic light-emitting diodes are based on the ability of certain compounds, especially semiconducting compounds or in this case organic compounds, to When they are subjected to an electric current, it becomes possible to inject charges, that is, electrons and holes, into them, thereby emitting light. A conventional organic light-emitting diode (OLED) structure comprises two electrodes on a substrate whose function is to inject charges of opposite sign, between which electrodes an organic layer is arranged, preferably formed of on...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L51/50H01L51/52F21V8/00
CPCH01L51/5203H01L51/5052H01L51/5271H10K50/155H10K50/165H10K50/805H10K50/813H10K50/856H05B33/26H05B33/22
Inventor 萨尔瓦托尔·西纳瓦尔特·德拉齐克兰德里·肖邦
Owner INTERDIGITAL CE PATENT HLDG