Patent ID: 6366329
Filing Date: 2002-04-02
Classification: H04N

Abstract:
A projection type video display apparatus using a progressive scanning mode, said apparatus comprising:signal selecting means for receiving a plurality of video signals from external sources, and for selectively outputting one of the plurality of video signals in response to a first control signal; progressive scanning conversion means connected to an output of said signal selecting means for converting said selectively outputted one of the plurality of video signals from said signal selecting means to a video signal of the progressive scanning mode in response to a second control signal; cathode-ray tube driving means for amplifying the video signal of the progressive scanning mode from said progressive scanning conversion means to output a red-green-blue signal having red, green and blue components; progressive convergence means responsive to a third control signal for outputting a progressive convergence signal so as to minimize a difference between incidence angles of each of the red, green and blue components of the red-green-blue signal outputted from said cathode-ray tube driving means; cathode-ray tube means for outputting the red-green-blue signal from said cathode-ray tube driving means to a user in response to the progressive convergence signal; and control means for supplying the first control signal to said signal selecting means in response to a selection control signal from the user in order to select the video signal, for supplying the second control signal to said progressive scanning conversion means in order to convert said selectively outputted one of the plurality of video signals from said signal selecting means to the video signal of the progressive scanning mode, and for supplying the third control signal to said progressive convergence means.