Display device having a display window

Details Display device having a display window Display device having a display window

1993-03-31

1997-12-16

Patel, Nimeshkumar

Electric lamp and discharge devices

Cathode ray tube

Envelope

220 21R, 220 23A, H01J 2986

Patent

active

056989393

ABSTRACT:
A display device having a cathode ray tube which comprises a display window. The radius of curvature of the inside of the display window along the diagonal (R.sub.diag) is greater than 1.6.times.1.767.times.D and smaller than 3.0.times.1.767.times.D, where D is the length of the diagonal of the display window. For the inside surface it holds that the quotient of the sagittal height at the end of the diagonal (21) and the sum of the sagittal heights at the end of the long axis (22) and at the end of the short axis (23) ranges between 0.75 and 0.95. In embodiments, the inside surface also complies with the formula 1.5<R.sub.x (0,0)/R.sub.x (x.sub.max, O)<4, where R.sub.x (0,0) and R.sub.x (x.sub.max, 0) are the radii of curvature along the long axis in the centre of the display window and at the end of the long axis, respectively. By virtue thereof, an improved picture display as regards reflection, local doming and raster distortion can be obtained.

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patent: 4881004 (1989-11-01), Inoue et al.
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patent: 4924140 (1990-05-01), Hirai et al.
patent: 4985658 (1991-01-01), Canevazzi
patent: 5155410 (1992-10-01), Wakasond et al.
patent: 5274303 (1993-12-01), Bakker et al.

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