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A method of encapsulating an OLED device includes forming an OLED device on a substrate; providing a protective cover surrounding the OLED device and the substrate; providing a first sealing arrangement between the protective cover and top surface of the substrate, to define a first chamber enclosing the OLED device; providing a second sealing arrangement sealed to define a second chamber sealed from and enclosing the first chamber; and providing first desiccant material in the first chamber and providing second desiccant material in the second chamber closer to the bottom surface of the substrate than the top surface.
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