Patent ID: 8228317
Filing Date: 2012-07-24
Classification: G09G

Abstract:
1. An active matrix array device comprising an array of individually addressable matrix elements and driver circuitry for providing address signals to the matrix elements, the driver circuitry including digital to analogue converter circuitry for converting a digital pixel matrix element signal to an analogue drive level, wherein the digital to analogue converter circuitry comprises: a voltage selector for selecting a pair of voltages based on a first set of bits of the digital matrix element signal; and a converter arrangement for providing an analogue voltage level derived from the pair of voltages and from a second set of bits of the digital matrix element signal, wherein the converter arrangement comprises first and second digital to analogue converter circuits in parallel and which are adapted to provide an analogue voltage level to an output of the converter arrangement alternately, wherein the pair of voltages and the second set of bits are provided as inputs to each of the first and second digital to analogue converter circuits, wherein each of the first digital to analogue converter circuit and second digital to analogue converter circuit comprises an amplifier and a capacitor input arrangement connected to the amplifier input, wherein the output of the amplifier provides the output of the converter arrangement, wherein a respective one of the pair of voltages is coupled to an input side of each capacitor of the capacitor arrangement through a respective input switch arrangement, and an output side of each capacitor of the capacitor arrangement is coupled to the amplifier input.