A display device according to the present invention includes: a planarization
layer
for insulating between a gate electrode etc. and a data wiring, a drain electrode,
or the like of the transistor; and a barrier layer that is formed on an upper surface
or lower surface of the planarization layer and at the same time, adapted to suppress
diffusion of moisture or degassing components from the planarization layer. The
display device adopts a device structure effective in reducing the plasma damage
on the planarization layer by devising a positional relationship between the planarization
layer and the barrier layer. Also, in combination with a novel structure as a structure
for a pixel electrode, effects such as an increase in luminance can be provided
as well.