Television – Image signal processing circuitry specific to television – Sweep expansion or reduction
Reexamination Certificate
1998-01-07
2001-05-01
Eisenzopf, Reinhard (Department: 2614)
Television
Image signal processing circuitry specific to television
Sweep expansion or reduction
C348S581000, C348S561000, C348S441000, C348S552000
Reexamination Certificate
active
06226052
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an apparatus to adjust the over-scanning amount of a video scan and a method of controlling the apparatus. In the present invention, over-scanning is adjusted by varying the amount of signal information.
2. Description of the Prior Art
Generally, the actual horizontal size of the video signals which are to be displayed on a screen is larger than the effective size of the picture which is watched by users.
The difference between the horizontal width of the actual video signals and the effective size of the picture is called “over-scanning amount”.
The percentage of the over-scanning amount is called “over-scanning rate”. When a user selects an over-scanning adjustment function, the over-scanning can be adjusted if a microcomputer judges that the over-scanning rate is too small or too large.
Conventionally, the over-scanning is adjusted by adjusting the magnitude of the horizontal deflections.
FIG. 1
illustrates the conventional over-scanning adjusting method. The relationship of the over-scanning amount to the deflections will be described referring to FIG.
1
. If it is assumed that the size of the effective watchable picture is c, and that the magnitude of the horizontal deflection is A, then the over-scanning amount is a−c. If the magnitude of the horizontal deflection is B, then the over-scanning amount is b−c. That is, if the horizontal deflection is increased from A to B, then the over-scanning amount increases as much as b−a.
If the over-scanning amount is too large, then the magnitude of the horizontal deflection is reduced to decrease the over-scanning amount. On the other hand, if the over-scanning amount is too small, then the magnitude of the horizontal deflection is increased to increase the over-scanning amount. In this way, the over-scanning is adjusted.
In this conventional over-scanning amount adjusting method, however, when the deflection is varied, not only is the picture size varied but the brightness and the contrast are also varied. Such unintended changes in the brightness and contrast of the picture cause the viewer to have eye fatigue.
SUMMARY OF THE INVENTION
The present invention is intended to overcome the above described disadvantage of the conventional technique.
Therefore it is an object of the present invention to provide an apparatus to adjust over-scanning amount and a method of controlling the apparatus, in which only the picture size is varied by varying the amount of the signal information, with the brightness and the contrast being left intact.
In achieving the above object, the present invention is characterized as follows. That is, the over-scanning amount can be increased by inserting a pixel of signal information at a regular interval of pixels, and the over-scanning amount can be decreased by deleting a pixel of signal information at a regular interval of pixels.
REFERENCES:
patent: 4729012 (1988-03-01), Jose et al.
patent: 5048104 (1991-09-01), D'Aoust et al.
patent: 5218436 (1993-06-01), Sugiyama et al.
patent: 5249049 (1993-09-01), Kranawetter et al.
patent: 5303044 (1994-04-01), Richards
patent: 5309234 (1994-05-01), Kranawetter et al.
patent: 5323235 (1994-06-01), Tonomura et al.
patent: 5502511 (1996-03-01), Nagel
patent: 5534934 (1996-07-01), Katsumata et al.
patent: 5642167 (1997-06-01), Wallace et al.
patent: 5673086 (1997-09-01), Fukuoka et al.
patent: 5751370 (1998-05-01), Lee
patent: 5781241 (1998-07-01), Donovan
patent: 5835160 (1998-11-01), chen et al.
patent: 5949923 (1999-09-01), Ikeda
patent: 5953075 (1999-09-01), Nagata et al.
Desir Jean W.
Eisenzopf Reinhard
Samsung Electronics Co,. Ltd.
Sughrue Mion Zinn Macpeak & Seas, PLLC
LandOfFree
Apparatus to adjust the amount of over-scanning of a... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Apparatus to adjust the amount of over-scanning of a..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus to adjust the amount of over-scanning of a... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2564905