Patent Number: 6,674,226

Title: Color display tube with improved suspension of the color selection electrode

Abstract: A color display tube (1) is disclosed having an improved suspension system of the color selection electrode (12). The positional stability of the color selection electrode (12) is of eminent importance for the color purity of the color display tube (1). If the color selection electrode (12) slightly shifts, the electron beams (7,8,9) may impinge on electroluminescent material of the wrong color, leading to discolorations. It is recognized that this positional stability is improved by applying free end portions (22) of a smaller diameter on the supporting elements (17) because this will lower the friction between the free end portions (22) and the suspension means (20). This smaller diameter has the disadvantage that the insertion of the color selection electrode (12) into the display window (3) of the color display tube (1) becomes more difficult. This invention solves this problem by applying free end portions (22), which are provided with a centering tip (44). In order to prevent scratches--which lead to loose particles in the color display tube (1)--when the color selection electrode (12) is inserted or extracted, the free end portion (22) is smoothly shaped.

Inventors: Meissner; Jorg (Eindhoven, NL), Post; Jan Harmannus (Eindhoven, NL), Jacobs; Hernes (Breda, NL)

Assignee: Koninklijke Philips Electronics N.V.

International Classification: H01J 29/07 (20060101); H01J 029/80 ()

Expiration Date: 01/06/2021