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:
Sep. 13, 2005
Filed:
Feb. 21, 2003
Shanti A. Cavanaugh, Santa Rosa, CA (US);
Mark A. Crowley, Windsor, CA (US);
Neil J. Spatz, Santa Rosa, CA (US);
Shanti A. Cavanaugh, Santa Rosa, CA (US);
Mark A. Crowley, Windsor, CA (US);
Neil J. Spatz, Santa Rosa, CA (US);
Xtellus Inc., Morris Plains, NJ (US);
Abstract
A thermal control system for a liquid crystal cell is presented that may utilize a time division scheme to multiplex temperature sensing and heating functions across active thermal elements such that the cell may generally be kept at a constant temperature. A calibration process characterizes the profile of the cell and generates a polynomial regression formula that provides the voltage drive output for a temperature and cell state input. The control system stores the state of the liquid crystal cell, the regression formula, and reads the temperature of the liquid crystal cell to compute end assert the temperature compensated voltage drive.