On-screen displaying apparatus having zoom function
AssigneeKabushiki Kaisha Toshiba
InventorMasayori Sato
Life of this patent
Estimating the term…
Abstract
A projection type imaging display system utilizing a liquid crystal panel projector. The zoom position of a projection lens is detected as an indicator of the aspect ratio of the main image being projected. Based on the zoom position, the position of an information display signal superimposed upon the main image is adjusted relative to the position of the main image, so that the information display signal is displayed on the main image no matter what the aspect ratio of the main image is.
Claims4
An on-screen displaying system capable of superimposing a secondary video picture, represented by an on-screen signal, onto a main video picture, represented by a video signal, comprising:
- means for receiving said video signal and said on-screen signal;
- means for selectively outputting said on-screen signal in a predetermined period within a period of said video signal;
- means for displaying an output signal from said outputting means;
- a projection lens projecting light of an image from said displaying means;
- means for moving said projection lens in order to change a size of said image projected;
- means for detecting a position of said projection lens and generating a detecting signal related thereto;
- and
- on-screen timing setting means, responsive to said detecting signal, for controlling a timing at which said outputting means outputs said on-screen signal within said video signal so as to shift a position of a display of said on-screen signal relative to a display of said video signal so as to maintain the display of said on-screen signal within said image on said screen during enlarging.
Dependencies are inferred from the claim text.