| 摘要 |
<p>PURPOSE: To simplify a circuit configuration for driving a cold cathod element. CONSTITUTION: When image data for 1H (horizontal scanning time) are stored in shift register groups 37b and 37c, a timing signal Q3 is supplied from a timing control circuit 34 to the shift register groups 37b and 37c. Since this signal Q3 becomes high at the time corresponding to the ((2<n> )-1)th, where n=1,..., 7, and the period of 1H is equally divided by 2<3> 8, the image data stored in the shift register groups 37b and 37c are shifted in the direction of downward arrows in the figure respectively by this signal Q3, and are supplied to a latch circuit 42 of (m) bits. Individual bits of the image data are latched in turn from the lower-order bit by the latch circuit 42 in synchronization with the signal Q3, thus turning a signal outputted from the latch circuit 42 into a PWM (pulse width modulation) signal corresponding to the image data.</p> |
