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.