The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 30, 2004
Filed:
Oct. 09, 2000
John Karl Waterman, Mesa, AZ (US);
Three-Five Systems, Inc., Tempe, AZ (US);
Abstract
A matrix of liquid crystal pixels ( ) is provided. A digital-to-analog converter (DAC) ( , and ) is coupled to the matrix and produces an output voltage that can be applied to one or more pixels in the matrix. The DAC ( , and ) receives a calibrated multi-bit digital input and generates its output voltage to correspond to the digital input. A reference voltage generator ( ) generates at least two reference voltages at an output that is coupled to one input of a comparator ( ). Another input of the comparator ( ) is coupled to the DAC ( , and ) output. When the comparator ( ) is activated, it outputs one of two signals: a first signal when one input receives a higher voltage; and a second signal when the other input receives a higher voltage. A digital calibrator ( ) has at least one output and at least one input. The digital calibrator ( ) is adapted to receive an uncalibrated multi-bit digital signal at the input. The digital calibrator ( ) is also adapted to modify the uncalibrated multi-bit digital signal based at least in part on the output of the comparator ( ) to produce the calibrated digital signal. The digital calibrator ( ) applies the calibrated multi-bit digital signal at the output. The output of the digital calibrator ( ) is coupled to the input of the DAC ( , and ).