Patent ID: 8049707
Filing Date: 2011-11-01
Classification: G09G

Abstract:
1. A method for driving a display apparatus having a spatial light modulator and an illumination unit that includes at least one red LED, at least one green LED, and at least one blue LED, comprising the steps of: (a) examining a set of red video words to determine whether substantially all of the red video words in the set of red video words have values less than a predetermined value for red; (b) if substantially all of the red video words in the set of red video words have values less than the predetermined value for red, increasing the values of at least some of the red video words in the set of red video words to form a set of converted red video words; (c) supplying the set of converted red video words to the spatial light modulator; (d) adjusting the light emitted by the at least one red LED to compensate for the increasing of the values in step (b); (e) examining a set of green video words to determine whether substantially all of the green video words in the set of green video words have values less than a predetermined value for green; (f) if substantially all of the green video words in the set of green video words have values less than the predetermined value for green, increasing the values of at least some of the green video words in the set of green video words to form a set of converted green video words; (g) supplying the set of converted green video words to the spatial light modulator; (h) adjusting the light emitted by the at least one green LED to compensate for the increasing of the values in step (f); (i) examining a set of blue video words to determine whether substantially all of the blue video words in the set of blue video words have values less than a predetermined value for blue; (j) if substantially all of the blue video words in the set of blue video words have values less than the predetermined value for blue, increasing the values of at least some of the blue video words in the set of blue video words to form a set of converted blue video words; (k) supplying the set of converted blue video words to the spatial light modulator; and (l) adjusting the light emitted by the at least one blue LED to compensate for the increasing of the values in step (j), wherein step (a) comprises comparing the set of red video words to a set of threshold values, the predetermined value for red being a threshold value that is included in the set, and wherein there are a predetermined number of possible values for the red video words and a predetermined number of threshold values in the set, the number of threshold values in the set being substantially smaller than the number of possible values for the red video words.