This invention provides a display apparatus in which it is possible to
have a light emitting element emitted light with constant luminance
without coming under the influence of deterioration over time, and it is
possible to realize accurate gray scale express, and yet, it is possible
to speed up writing of a signal current to each pixel, and influence of
noise of a leak current etc. is suppressed, and a driving method thereof.
A plurality of pairs of switch parts and current source circuits are
disposed in each pixel. Switching of each of a plurality of the switch
parts is controlled by a digital video signal. When the switch part is
turned on, by a current supplied from the current source circuit making a
pair with the switch part, the light emitting element emits light. A
current which is supplied from one current source circuit to the light
emitting element is constant. A value of a current flowing through the
light emitting element is comparable to a value of added currents which
are supplied to the light emitting element from respective all current
source circuits making pairs with the switch parts which are in the
conductive states.