Television – Basic receiver with additional function – For display of additional information
Patent
1992-10-26
1995-07-18
Groody, James J.
Television
Basic receiver with additional function
For display of additional information
348565, 348567, 348588, H04N 974, H04N 5262
Patent
active
054346258
DESCRIPTION:
BRIEF SUMMARY
The invention relates to the field of televisions capable of displaying side by side pictures of substantially equal size from different sources, and in particular, to such televisions having a wide display format ratio screen.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention is applicable to both direct view televisions and projection televisions.
2. Description of Related Art
The ratio of the width to the height of the borders of a picture or the borders of a display screen for a picture are referred to herein as the display format ratio, or alternatively, the format display ratio. The ratio of the width to the height of images forming a picture is referred to herein as the image aspect ratio. The result of a mismatch of display format ratios between a video source and a video display, or between a video source and a portion of a video display, which results in distorted images in a picture is referred to herein as image aspect ratio distortion.
Most televisions today have a display format ratio of 4:3. A wide display format ratio corresponds more closely to the display format ratio of movies, for example 16:9.
Televisions having a format display ratio of 4:3, often referred to as 4.times.3, are limited in the ways that single and multiple video signal sources can be displayed. Television signal transmissions of commercial broadcasters, except for experimental material, are broadcast with a 4.times.3 format display ratio. Many viewers find the 4.times.3 display format less pleasing than the wider format display ratio associated with the movies. Televisions with a wide format display ratio provide not only a more pleasing display, but are capable of displaying wide display format signal sources in a corresponding wide display format. Movies "look" like movies, not cropped or distorted versions thereof. The video source need not be cropped, either when converted from film to video, for example with a telecine device, or by processors in the television.
Televisions with a wide display format ratio are also suited to a wide variety of displays for both conventional and wide display format signals, as well as combinations thereof in multiple picture displays. However, the use of a wide display ratio screen entails numerous problems. Changing the display format ratios of multiple signal sources, developing consistent timing signals from asynchronous but simultaneously displayed sources, switching between multiple sources to generate multiple picture displays, and providing high resolution pictures from compressed data signals are general categories of such problems.
Televisions with a wide display format ratio can be implemented in television systems displaying video signals both at basic or standard horizontal scanning rates and multiples thereof, as well as by both interlaced and noninterlaced scanning. Standard NTSC video signals, for example, are displayed by interlacing the successive fields of each video frame, each field being generated by a raster scanning operation at a basic or standard horizontal scanning rate of approximately 15,734 Hz. The basic scanning rate for video signals is variously referred to as f.sub.H, 1f.sub.H, and 1H. The actual frequency of a 1f.sub.H signal will vary according to different video standards. In accordance with efforts to improve the picture quality of television apparatus, systems have been developed for displaying video signals progressively, in a noninterlaced fashion. Progressive scanning requires that each displayed frame must be scanned in the same time period allotted for scanning one of the two fields of the interlaced format. Flicker free AA-BB displays require that each field be scanned twice, consecutively. In each case, the horizontal scanning frequency must be twice that of the standard horizontal frequency. The scanning rate for such progressively scanned or flicker free displays is variously referred to as 2f.sub.H and 2H. A 2f.sub.H scanning frequency according to standards in the United States, for example, is approximately 31,468
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Burgess Glenton B.
Fried Harvey D.
Groody James J.
Laks Joseph J.
Thomson Consumer Electronics Inc.
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