An organic light-emitting display device includes: a light-emitting element located between a first substrate and a second substrate, and adapted to emit light; a phase difference plate disposed on the first substrate or the second substrate in a path through which the light emitted from the light-emitting element is propagated, the phase difference plate being adapted to change a phase of an incident light; a wire grid polarizer disposed on the phase difference plate, and adapted to reflect a light having a specific polarization direction and to transmit a light having a polarization direction opposite to the specific polarization direction; and a dye-based polarizer disposed on the wire grid polarizer, and adapted to transmit the light having the polarization direction opposite to the specific polarization direction and to absorb the light having the specific polarization direction.