| 摘要 |
Parts (411 - 47n) for managing/controlling signals of scanning drivers LSIs in an LCD module are connected to each other in cascade and are configured identically. The signals sensed by the parts (471, 472, and 47n) are respectively a clock LP for latching data signals, a frame starting signal SP and an alternating clock FR which are applied to terminals CKB1, CKB2, and CKBn respectively. The part for managing/controlling signals 471 has a circuit for sensing the stop of signal to be sensed, as a signal sensing means, and sequential processing circuit (51) comprising a circuit for delaying signals (49), and a logical circuit (50). For example, when the oscillation of the frame starting signal SP is stopped, the outputs (T1 - Tn) of the circuit (51) change into an L level, a display-off signal DF of the LCD module goes to an L level and a liquid crystal panel is forced to be in a display-off mode. Thus, even if the frame starting signal SP is stopped due to any cause, the voltage applied to a liquid crystal is dropped to zero. Consequently, the DC driving of the liquid crystal can be avoided and the deterioration of the liquid crystal, etc. can be prevented. <IMAGE> |
