Method of driving an electro-optic display utilizing internal capacitance to smooth a digitally modulated signal
AssigneeCambridge Display Technology Limited
InventorsEuan C. Smith, David S. Warren, Richard Alan Page, Stefan Wurster, Barry Thompson
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Abstract
A method of driving an electro-optic display comprising providing a current source, digitally modulating the current source and generating a modulated digital signal, and converting the modulated digital signal into an effective analog drive signal so that the display pixels receive an effective analog drive current, wherein the internal capacitance of the electro-optic display smooths the digitally modulated signal and generates the effective analog drive signal.
Claims8
A method of driving an electro-optic display having a plurality of display pixels, the method comprising providing a current source;
- digitally modulating the current source at a modulation frequency and generating a modulated digital signal;
- and converting the modulated digital signal into an effective analog drive signal so that the display pixels receive an effective analoq drive current, wherein the internal capacitance of each display pixel of the electro-optic display gives rise to an RC time constant of each display pixel such that the modulation frequency is above the cutoff frequency determined by the RC time constant for each display pixel, and wherein the internal capacitance smooths the digitally modulated signal and generates the effective analoq drive signal, wherein the digitally modulating is at a modulation frequency within the range of 1 MHz to 2 MHz.
Dependencies are inferred from the claim text.