Circuit tests VCOM drivers

Posted on Sep 14, 2012    8483

Flat-panel LCD monitors offer excellent image quality and more compact form factor than CRTshence, their steadily increasing popularity. Unfortunately, the complexity of their manufacturing process makes LCD monitors considerably more expensive than CRTs. The amplifier that drives VCOM, the voltage on the backplane of the LCD panel, must be able to drive large capacitive loads, deliver high peak output currents, and maintain a constant output voltage.

. This Design Idea describes a simple test to measure the usefulness of an amplifier used as a VCOM driver. First, consider some video theory. Flat-panel television screens differ in the rate at which the screen refreshes. The refresh rate for TVs depends

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