Patent ID: 8614723
Filing Date: 2013-12-24
Classification: G03B

Abstract:
1. A display system, comprising: a color wheel having a plurality of filter segments including a neutral density filter segment; a spatial light modulator having an array of pixel display elements with respective associated pixel memory cells, the pixel display elements being individually settable in response to data; a lamp for projecting a beam of light sequentially through the different ones of the filter segments onto the spatial light modulator array as the color wheel rotates; circuitry for generating bit plane sequences of the data for setting the pixel display elements, including for generating neutral density bit plane sequences for modulation of the beam during projection through the neutral density filter segment; and circuitry for loading the generated bit plane sequences of the data for setting the pixel display elements; the circuitry for generating the bit plane sequences including a memory having a first look-up table for providing given bit plane sequences including given neutral density bit plane sequences corresponding to a given effective transmission factor for the neutral density filter segment; the effective transmission factor corresponding to a product of a transmission parameter of the neutral density filter and a pulse-to-plateau ratio of an amplitude of the beam during a maintenance pulse of the lamp to the amplitude of the beam in the absence of such pulse; and the circuitry for generating the bit plane sequences further including a second look-up table in the sequence memory for providing compensation data, accessed based upon a current effective transmission factor, for providing compensated bit plane sequences including compensated neutral density bit plane sequences having unchanged portions provided by the first look-up table and changed portions provided by the second look-up table.