Multi-window picture adjustment arrangement for a video display
First Claim
Patent Images
1. A video display apparatus, comprising:
- a display device for displaying an image;
a source of a plurality of input video signals containing picture information for display in a plurality of windows including a window having a selectable size to form said image; and
a signal processor responsive to said plurality of input video signals for applying the picture information for display in said plurality of windows, said signal processor automatically varying at least one of a brightness characteristic and a contrast characteristic of a first output video signal, associated with a first of said windows, relative to that of a second output video signal, associated with a second of said windows, when a magnitude of a light output of said image is outside a range of values, the variation being adjusted in accordance with said size selection.
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Abstract
In a multi-window arrangement, the light output attributable to each window in a multiple window display is calculated, for example, in accordance with the video signal that provides the picture information for display in the window and in accordance with the window area. When the total light output contributed by all the windows exceeds a predetermined level, a loop controller automatically reduces, for example, the contrast and the brightness in selected windows, in accordance with a rule, in a loop control manner. The result is that the total light output drops below the predetermined level.
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Citations
16 Claims
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1. A video display apparatus, comprising:
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a display device for displaying an image;
a source of a plurality of input video signals containing picture information for display in a plurality of windows including a window having a selectable size to form said image; and
a signal processor responsive to said plurality of input video signals for applying the picture information for display in said plurality of windows, said signal processor automatically varying at least one of a brightness characteristic and a contrast characteristic of a first output video signal, associated with a first of said windows, relative to that of a second output video signal, associated with a second of said windows, when a magnitude of a light output of said image is outside a range of values, the variation being adjusted in accordance with said size selection. - View Dependent Claims (2, 3, 4, 5)
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6. A video display apparatus, comprising:
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a display device for displaying an image;
a source of a plurality of input video signals containing picture information for display in a plurality of windows including a window at an inactive state and a window at an active state to form said image; and
a signal processor responsive to said plurality of input video signals for applying the picture information for display in said plurality of windows, said signal processor automatically varying at least one of a brightness characteristic and a contrast characteristic of a first output video signal, associated with a first of said windows, relative to that of a second output video signal associated with a second of said windows, when both a light output of said image is outside a range of values and said first window is at said inactive state.
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7. A video display apparatus, comprising:
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a display device for displaying an image;
a source of a plurality of input video signals containing picture information for display in a plurality of windows to form said image; and
a signal processor responsive to said plurality of input video signals for applying the picture information for display in said plurality of windows, said signal processor automatically varying at least one of a brightness characteristic and a contrast characteristic of a first output video signal, associated with a first of said windows, relative to that of a second output video signal, associated with a second of said windows, when a magnitude of a light output of said image is outside a range of values, said signal processor deriving said light output magnitude via a signal path that excludes said display device. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification