The present invention has an object of providing a light emitting device
including an OLED formed on a plastic substrate, which can prevent the
degradation due to penetration of moisture or oxygen. On a plastic
substrate, a plurality of films for preventing oxygen or moisture from
penetrating into an organic light emitting layer in the OLED (hereinafter,
referred to as barrier films) and a film having a smaller stress than that
of the barrier films (hereinafter, referred to as a stress relaxing film),
the film being interposed between the barrier films, are provided. Owing
to a laminate structure of a plurality of barrier films, even if a crack
occurs in one of the barrier films, the other barrier film(s) can
effectively prevent moisture or oxygen from penetrating into the organic
light emitting layer. Moreover, the stress relaxing film, which has a
smaller stress than that of the barrier films, is interposed between the
barrier films, thereby making it possible to reduce a stress of the entire
sealing film. As a result, a crack due to stress hardly occurs.
