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:
Jun. 05, 2007
Filed:
Apr. 21, 2004
Chung Hee Lee, Chung-gu Daegu, KR;
U Hyun Kim, Gumi-si, KR;
Chung Hee Lee, Chung-gu Daegu, KR;
U Hyun Kim, Gumi-si, KR;
LG Electronics Inc., Seoul, KR;
Abstract
Disclosed is a video display an auto-convergence error in a projection television receiver (TV) capable of preventing generation of an error when an auto-convergence is performed. The apparatus includes a screen for displaying an image signal, first to eighth sensing units having first and second optical sensors for sensing a pattern displayed on the screen, first and second amplifying units for receiving and amplifying sensed values sensed by the first to fourth sensing units and the fifth to eighth sensing units with predetermined multiple amplification factors, first and second comparators for receiving and comparing amplified values outputted from the first and second amplifying units, an inverter for inverting output values of the first and second comparators, an operation unit for AND-gating the outputs of the amplifying units and outputs of the inverter, and a microcomputer for receiving an output of the operation unit, judging a degree of convergence correction, and outputting a corresponding control signal.