Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1984-05-04
1987-01-06
Groody, James J.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358 67, 313471, 315369, 315370, H04N 924, H01J 2910, H01J 2974, H01J 2956
Patent
active
046351060
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a television receiver in which a picture or image is displayed on a raster or displaying surface of a cathode ray tube by having said surface scanned with a single electron beam. More particularly, it relates to such television receiver in which color fluorescent materials are provided so as to extend in a beam main-scanning direction and a color picture or image is displayed on the raster surface with the aid of line-sequential video signals.
PRIOR ART
In a color television receiver, in general, a screen coated with color phosphorescent materials (phosphors) capable of emitting three primary colors, that is, red, green and blue colors, when activated, is scanned with a single electron beam or three electron beams for displaying a color image or picture on the screen. So far, there has been evolved a variety of color television receiver systems.
For example, there has been provided a color television system making use of a beam-indexing tube in which plural stripes of color phosphorescent materials are arranged side by side in the main-scanning (or horizontal) direction on a screen of a cathode ray tube (CRT) so as to extend in the sub-scanning (usually, vertical) direction, index lines are arranged between said stripes for providing index signals indicative of the beam scanning position, the color phosphorescent materials are scanned dot- or point-sequentially with a single electron beam, and in which the electron beam is switched between different colors based on said index signals. With this version of the color television receiver, the electron beam is driven by pulses for color switching with a higher frequency of several hundred times in each horizontal period. This results in useless obstructive radiation and an extremely complicated circuit design.
Another type of the color television receiver known in the art is so constructed that the screen has plural lines of color phosphorescent materials that extend parallel to the main-scanning (usually horizontal) direction, the phosphorescent materials are scanned line-sequentially with a single electron beam, and the beam is switched between different colors with the period of the horizontal sync signal (1H period). However, with this line-sequential type system, correct landing of the electron beam on the respective color phosphorescent lines and interlacing between odd-line and even-line fields are required, thus unnecessarily complicating the screen construction and the circuit design.
In consideration of the prior-art practice, described briefly above, it is a principal object of the present invention to provide a television receiver in which fluorescent lines are arranged so as to extend parallel to the main-scanning (usually, horizontal) direction, wherein beam landing on the respective color phosphorescent lines and interlacing between odd and even fields may be assured by a simplified structure.
DISCLOSURE OF THE INVENTION
The feature of the television receiver of the present invention resides in that a plurality of imagedisplaying fluorescent lines are disposed on a display surface of a cathode ray tube so as to extend along a main-scanning direction of an electron beam, said lines are disposed in a side-by-side relation in a sub-scanning direction normal to said main-scanning direction, two kinds of beam detection stripes are arranged on guard band portions that are disposed parallel to and between adjacent ones of said fluorescent lines, said beam detection stripes are so adapted that beam detection signals are taken sequentially, alternately and independently from said stripes, and the relative beam position with respect to the fluorescent lines is compensated on the basis of said beam detection signals taken independently from these two kinds of beam detection stripes.
In this manner, positive landing control of the electron beam relative to the respective fluorescent lines and interlaced scanning between odd and even fields may be realized by a simplified circuit configuration.
BRIEF DESCRIP
REFERENCES:
patent: 2684454 (1954-07-01), Huffman
patent: 2728026 (1955-12-01), Van Overbeek
patent: 2757313 (1956-07-01), Miller
patent: 2762949 (1956-09-01), Huffman
patent: 2934600 (1960-04-01), Schwartz et al.
patent: 3784735 (1974-01-01), Brown et al.
patent: 3800072 (1974-03-01), Lejon
patent: 4259687 (1981-03-01), Shinkai et al.
patent: 4369460 (1983-01-01), Weiss
Eslinger Lewis H.
Groody James J.
Sinderbrand Alvin
Sony Corporation
Svihla Randall S.
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