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. 21, 2004
Filed:
Aug. 16, 2001
Peter J. Janssen, Scarborough, NY (US);
Lucian Remus Albu, New York, NY (US);
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Abstract
A liquid crystal display (LCD) device includes a circuit for calibrating out non-linearities in the signal processing path from received digital input data to the analog voltage produced on a data (column) line of the display, and for calibrating out differences between column drivers and column lines in the device. The device receives digital input data and in response thereto generates an analog data voltage to be applied to a column line. The device includes a circuit for generating a precision staircase reference signal, and a circuit for comparing the precision staircase reference signal voltage to the data voltage and in response thereto producing a calibration data error value which is stored in the device. One, or beneficially all, columns of the device are calibrated by stepping the digital input data through each value in its operating range and storing the corresponding calibration data error values in memory.