| 摘要 |
PROBLEM TO BE SOLVED: To realize a control circuit which operates a light emitting elements row with small power and reduces complexity by providing 1st and 2nd current sources connected to a 1st column circuit connected to the light emitting elements. SOLUTION: A drive circuit for the column line 20 to which the light emitting elements 23 to 27 are connected consists of a current source 15, a comparator 16, a current source 14 and a transistor 17. A large current is supplied at a start of each of column cycles by adding to the large current source 15 to charge the column up to a prescribed voltage. A reference voltage corresponding to the prescribed voltage is applied to a reference voltage line 12 during a charging period, once the voltage reaches the prescribed voltage, the comparator 16 disconnects the source 15. Next, the source 15 supplies a 'quick charge' current to charge the capacitor of an active light emitting element in the column, and supplies a desired pixel current when inheritance to the source 14 becomes available. Thus, the source supplies sufficient current and the active light emitting elements emit light in most of the column cycles. |
