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US 6,631,996 B2Granted
Projection system, and method of operating a projection system
AssigneeKoninklijke Philips Electronics N.V.
InventorsHolger Moench, Xaver Riederer
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AssigneeKoninklijke Philips Electronics N.V.
InventorsHolger Moench, Xaver Riederer
Estimating the term…
A method of operating a projection system with at least one high intensity discharge lamp (HID lamp), a rotatable color disc with at least three segments of different colors, and an array (DMD) comprising a plurality of individually movable mirrors, wherein the current strength of the electrical operating current supplied to the HID lamp is varied in time such that the light arc of the lamp is stabilized, is to be constructed such that the power and operational life of the HID lamp used are optimized. The current strength of the operating current for the HID lamp is for this purpose varied such that the current strength reaches a maximum when a given segment of the color disc, and preferably exclusively this segment, is present in the radiation path of the light rays used for the projection.
A method of operating a projection system with at least one lamp, wherein a sequential series of colors is generated with the aid of the luminous flux of the lamp and wherein the current strength of the electrical operating current supplied to the lamp is varied in time, wherein the sequential series of colors comprises at least white, characterized in that the current strength of the operating current of the lamp is varied such that the current strength reaches a maximum when white is being generated.
A projection system comprising at least one lamp, preferably a high intensity discharge lamp, with means for generating a sequential series of colors including the color white with the aid of the lamp and with means for controlling the current strength of the electrical operating current supplied to the lamp in time, preferably for stabilizing the light arc, characterized in that said control means are operationally linked to the means for generating a sequential series of colors by synchronization means and for maximizing the lamp current strength when white is being generated.
Dependencies are inferred from the claim text.