A projection type image display apparatus which suppresses deterioration in luminous
efficiency of an organic EL element and reduces flickering of projected images
and an amplitude of a power supply capacity is disclosed. The apparatus comprises
an electroluminescence (EL) element, a projection optical system, and a controller
which generates drive signals to control the emission amount from the EL element.
An EL material used for a luminescent layer of the EL element is a phosphorescent
material which emits phosphorescence by priority, which is emitted from an excited
triplet state. The controller generates drive signals by superimposing an intermittent
turning-on signal on emission amount modulating signals to modulate current values
to be injected into pixels according to display image signals.
