Encapsulation structure that acts as a multilayer mirror
US6888305B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 6, 2001 |
| Grant date | May 3, 2005 |
| Priority date | — |
| Expiry date | Feb 11, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10K59/878
Abstract
The present invention is directed to novel structures for use in connection with OLED devices that simulaneously act as a multiplayer mirror and as a barrier to harmful species in the exterior environment. According to one embodiment of the invention, an OLED structure includes (a) a substrate; (b) an OLED over the substrate that includes (i) a first electrode, (ii) an emission region above the first electrode and (iii) a second electrode above the emission region, wherein the OLED emits light having a range of wavelengths upon being turned on; and (c) a multiplayer mirror over the substrate, the multiplayer mirror including an alternating series of (i) planarizing layers having a first refractive index and (ii) high-density layers having a second refractive index that differs from the first refractive index. The thicknesses of the planarizing layers and of the high-density layers in this embodiment are selected such that the multiplayer mirror is tuned to transmit light at a peak wavelength within the range of wavelengths emitted by the OLED. Moreover, the planarizing layers and the high-density layers cooperate to restrict transmission of water and oxygen.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.