Abstract: A color display tube comprising a display window which changes into a skirt which is substantially parallel to the axis of the tube via a strongly curved part. The inner surface of the window changes into the inner surface of the skirt via a strongly curved surface having a radius of curvature r. The outer surface of the window changes into the outer surface of the skirt via a strongly curved surface. The display window comprises on its inside a substantially rectangular display screen and a shadow mask at a short distance in front of the display screen, which mask is supported in the corners of the display window by suspension means fixed in the skirt. In the proximity of the strongly curved transition the skirt has a thickness d. In a plane perpendicular to the tube axis the distance D between the boundary of the luminescent material of the display screen and the outer surface of the skirt throughout the circumference of the window is substantially equally large and for r.ltoreq.

Abstract: A color display tube comprising a faceplate including a display window connected to a skirt which is substantially parallel to the axis of the envelope via a sharply curved transition portion. The set of points defining where the inner surface of the window meets the inner surface of the transition part is formed by a closed line l. The set of points defining where the outer surface of the window meets the outer surface of the transition portion is formed by a closed line m. A display screen of luminescent material provided on the inner surface of the display window has a substantially rectangular boundary which coincides substantially with the line l. A large viewing angle .alpha. is obtained within which no distortion of the picture edge occurs when, from any point Q in the line m, the shortest connection line to the line l encloses with a normal line h (normal to the outer surface of the window) an angle .gamma., for which the relationship holds that:n sin .gamma.=sin (.alpha.-.beta.

Abstract: A display tube comprising an envelope consisting of a neck, a cone, and a faceplate including a flat or slightly curved, substantially rectangular display window and a skirt which is substantially parallel to the axis of the envelope. The skirt and the display window meet at a sharply-curved transition portion of the faceplate. The display window has on its inside a substantially rectangular display screen. The display window and the skirt near the sharply curved portion and over the whole circumference of the display window have a thickness d which to an approximation satisfies the following relationship:d=C D.sup.0.8 R.sup.0.2whereinC is a constant between 0.015 and 0.025,D is the diagonal of the inner surface of the display window, andR is the radius of the curvature of the inner surface of the display window.The tube is implosion-safe and the faceplate has a narrow dark edge which is equally wide substantially everywhere around the display screen.