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AssigneeKoninklijke Philips Electronics N.V.
InventorsCarsten Deppe, Holger Monch
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The present invention relates to a method of operating a projection system comprising several solid state light sources (2, 3, 4) of different colour 13, 14, 15) and at least one spatial light modulator (1) having an array of switchable elements. Said array is illuminated by at least one of said light sources (2, 3, 4) for several illumination periods and is addressed such that the light is timely and spatially modulated to project images onto a screen. In the present method said light sources (2, 3, 4) are controlled to emit light modulated in amplitude (15) and/or time (18) during said illumination periods of said array. With the present method an increased greyscale resolution of the projection system can be achieved.
A method of operating a projection system, said projection system comprising several solid state light sources of different colour and at least one spatial light modulator having an array of switchable elements, said array being illuminated by at least one of said light sources and addressed such that the light is timely and spatially modulated to project images onto a screen, said modulation being achieved by switching said switchable elements by means of pulse width modulation, wherein at least one of said light sources (2, 3, 4) is controlled to emit light modulated in time, to generate at least one light pulse during at least one switching state of said switchable elements, in which the light is directed onto the screen, said light pulse having a duration shorter than a shortest switching state of said switchable elements.
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A projection device comprising
Dependencies are inferred from the claim text.