| 摘要 |
The drive voltage (VDATA-VREF) across an active matrix liquid crystal display module (24) is reversed on alternate frames or alternate lines by using a fixed voltage level (VREF) at one side of the LCD module and shifting the level of a base component (VBASE) on the other side of the module between higher and lower voltage levels that are respectively higher than the fixed reference level and lower than the fixed reference level. All voltages have the same polarity so that polarity shifting of any applied voltage is not required. An intensity level component from a digital to analog converter (40a), controlled by a digital input code (41), is combined with the base component in the same sense in alternate frames, but with the digital input code inverted in alternate frames.
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