| 摘要 |
PURPOSE:To constitute so that light and shade of display can be selected by a user, by setting the driving pulse width to an optional state by an external operating member, and driving a liquid crystal display body by voltage of set pulse width. CONSTITUTION:By an external switch 1 and 2, counting contents of a shift register 4 are set to a prescribed state, and one kind among signals SLT1-4 whose pulse width is different from each other is selected 5. Also, only when the signal SLT is generated, prescribed voltage is outputted from transmission gates 10, 12, and driving voltage COM1 of a liquid crystal is obtained. |
