Matrix display devices
AssigneeKoninklijke Philips Electronics N.V.
InventorsMartin John Edwards, Karel Elbert Kuijk
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Abstract
Digital to analogue conversion in an AMLCD is obtained by using the column electrode capacitance as part of the digital to analogue conversion circuit by dividing columns (19) into separate sections and serially performing the conversion via switching elements (31). Alternative embodiments comprise a column driver circuit with capacitors having a (binary) divided range of capacitance or use column sub-electrodes of different widths.
Claims9
A matrix display device comprising a matrix of picture elements at the crossings of selection electrodes to select rows of picture elements and column electrodes to provide data, further comprising drive means via which selection signals and data signals are applied to the picture elements, the matrix display device comprising charge redistribution digital to analogue converter means for converting a multi-bit digital data signal, the digital to analogue converter means comprising at least one conversion switch, characterised in that the digital to analogue conversion of said digital to analogue converter means at least comprises the column electrode capacitance.
Dependencies are inferred from the claim text.