H - Electricity – 01 – J
Patent
H - Electricity
01
J
313/35.19
H01J 29/06 (2006.01) H01J 29/86 (2006.01)
Patent
CA 1218407
ABSTRACT: A colour display tube comprising a display window which changes into a skirt which is substantially parallel to the axis of the envelope via a strongly curved part. The set of points where the inner surface of the window changes into a first strongly curved surface is formed by a closed line 1. The set of points where the outer sur- face of the window changes into a second strongly curved surface is formed by a closed line m. The first and second surfaces constitute the transition to the inner and outer surfaces, respectively, of the skirt. A display screen of luminescent material provided on the inner wall of the display window has a substantially rectangular boundary which coincides substantially with the line 1. A large viewing angle ? is obtained within which no dis- tortion of the picture edge occurs when in any point Q of the line m the shortest connection line to the line 1 with the normal to Q on the outer window surface of the window encloses an angle Y for which the relationship holds that: n sin ? = sin (? - .beta.) wherein _ is the refractive index of the glass of the dis- play tube, ? is the maximum viewing angle, between 55° and 65°, defined with respect ot the tube axis, and .beta. is the angle between the said normal and the tube axis.
468852
Bakker Gijsbertus
Rorije Gerhardus J.
Koninklijke Philips Electronics N.v.
Van Steinburg C.e.
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