Self converging wide screen color picture tube system

Details Self converging wide screen color picture tube system Self converging wide screen color picture tube system

1992-10-19

1995-04-18

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

335213, 313413, H01J 2956

Patent

active

054081637

DESCRIPTION:

BRIEF SUMMARY
This invention relates to a self converging wide screen color picture tube system.
To provide a more pleasing viewing experience, there has recently been developed a family of picture tubes having an aspect ratio of 16.times.9, where 16 represents the screen dimension in arbitrary units along the horizontal or X-direction, and 9 represents in the same units the distance along the vertical, or Y-direction. FIG. 1 schematically compares a widescreen, 16.times.9 aspect ratio picture tube viewing screen VSW with a standard narrowscreen, 4.times.3 aspect ratio viewing screen VSN. For the same diagonal length D of e.g. 86.3 cm (34 V), the wide aspect ratio viewing screen is approximately 9% wider in the X-direction and approximately 10% shorter in the Y-direction than the corresponding narrow aspect ratio viewing screen.
In addition to the wider aspect ratio, other pleasing viewer features include a picture tube with a panel that is nearly rectangular in shape, and with the contour of the panel faceplate as flat as practical, taking into account the overall weight and implosion strength requirements of the picture tube.
FIG. 2 illustrates a front view of a rectangular faceplate 18 of a widescreen, 16.times.9 aspect ratio color picture tube. Located on the inner surface of faceplate 18 is a line stripe type of color phosphor screen VSW. Associated with rectangular faceplate 18 is a major axis X, a minor axis Y, and diagonals D. Two long sides, L, of faceplate 18 are substantially parallel to the major axis X, and two short sides, S, are substantially parallel to the minor axis Y.
The inside surface of faceplate 18 of FIG. 2 is shown in perspective in FIG. 3 including curved lines 22-26 which follow the inner surface contour of faceplate 18 in directions corresponding to those indicated in FIG. 2. For each one of curved lines 22-26 there is associated an equivalent radius R which corresponds to the radius of a circle that touches the center CW of faceplate 18 and the corresponding extremes of the faceplate at the edges of the viewing screen. The actual contour of the inner surface of faceplate 18 is more complex and is more precisely defined by the equations to be discussed herein.
In FIG. 3, the equivalent radius of curve 22, which follows the major axis, is designated RX, and the equivalent radius of curve 23 which follows the minor axis is designated RY. The equivalent radius of curve 25, which follows the long side of the faceplate, is designated RL, and the equivalent radius of curve 26, which follows the short side, is designated RS. The equivalent radius of curve 24, which follows a faceplate diagonal, is designated RD.
The contour of the inner surface of faceplate 18 is defined by the following polynomial sum equation. ##EQU1##
ZW is defined as the distance of a point on the inner surface of faceplate 18 from the sagittal plane tangent to the inner surface at center point CW. Each of X and Y is defined as the distance from center CW in a sagittal plane along a respective one of orthogonal axes having directions corresponding to those of the major and minor axes.
The ZW equation defines a family of aspherical, faceplate contours which can be made relatively flat by proper parameter selection.
For a flat faceplate having a viewing screen diagonal distance DW=86.3 centimeter in the sagittal plane, the coefficients Ai and the exponents Ji, Ni, Mi are given in the following table.


TABLE I ______________________________________ A(1) = +2.7548540 J(1) = -04 N(1) = 2 M(1) = 0 A(2) = +3.0213080 J(2) = -10 N(2) = 4 M(2) = 0 A(3) = +4.9051820 J(3) = -04 N(3) = 0 M(3) = 2 A(4) = -2.0299050 J(4) = -10 N(4) = 2 M(4) = 2 A(5) = -6.3074090 J(5) = -15 N(5) = 4 M(5) = 2 A(6) = +9.4301190 J(6) = -11 N(6) = 0 M(6) = 4 A(7) = +5.2725900 J(7) = -15 N(7) = 2 M(7) = 4 ______________________________________
Heretofore, a deflection yoke for use in a large screen, wide aspect ratio picture tube has been of the nonself converging type, requiring auxiliary coils in the yoke to provide outer beam conv

REFERENCES:
patent: 4329671 (1982-05-01), Gross et al.
patent: 4376924 (1983-03-01), Gross et al.

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