SYSTEM AND METHOD FOR DRIVING COLUMNS OF AN ACTIVE MATRIX DISPLAY

摘要

Described is a system and method for driving columns of an active matrix display using a resistor-string digital-to-analog converter (DAC). The description includes an auto-stop buffer circuit that drives an analog data voltage in two steps; the first step being active buffering by a "dead-zone amplifier" before the output reaches a certain level and the second step being acting as a passive conduit after the output reaches the certain level. The dead-zone amplifier inherently turns itself off when the analog voltage reaches the certain level. Also described are various column driver architectures in which buffers are placed in various ways in a column driver in between the resistor-string DAC and the column decoders in order to minimize the number of required buffers.