Patent ID: 6803891
Filing Date: 2004-10-12
Classification: G09G

Abstract:
A driving apparatus for a light-emitting display which controls the light-emission of M number of light-emitting elements in such a manner that a driving current or driving voltage is turned on or off by an on/off signal supplied through a driving unit comprising:a pixel read section for reading the luminance values for the light-emitting elements in a frame period from an image signal: and a &Dgr;&Sgr; modulator which operates in a sub-frame period which is 1/n of the frame period according to the luminance values read by the pixel read section, wherein an output of â€œ1â€  or â€œ0â€  from &Dgr;&Sgr; modulator is supplied to the driving unit as the on/off signal, and wherein the &Dgr;&Sgr; modulator comprises: an adder; a first delay unit for delaying an output from the adder by the sub-frame period; a deciding unit for deciding whether or not the output from the adder is not smaller than a prescribed value so that if YES, a positive:prescribed value is outputted and if NO, a negative prescribed value is outputted; and a second delay unit for delaying the prescribed value outputted from the deciding unit by the sub-frame period; wherein the adder performs an addition of outputs from the pixel read section and from the first delaying unit, a subtraction of an output from the second delay unit to produce a positive or negative sign bit of the prescribed value from the deciding unit as an output from the &Dgr;&Sgr; modulator.