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AssigneeKoninklijke Philips Electronics N.V.
InventorsArnoldus Antonius Maria Hendriks, Wilhelmus Marinus Maria Van De Steen, Jean Winters, Piet Christiaan Jozef Van Rens
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A color display tube (1) is disclosed with an improved suspension of the color selection electrode (12). In order to have a color display tube with good properties of, for instance, color purity, it is of eminent importance that the color selection electrode (12) has and excellent positional stability. Especially wide screen tubes seem to be more sensitive to external shocks by which the color selection electrode (12) may shift and cause discolorations. The positional stability of the color selection electrode (12) can be improved by decreasing the friction between the color selection electrode (12) and the supporting elements (17) in the display window (3) of the color display tube (1). This is achieved by applying a supporting element (17) with a free end portion (22) having a small diameter and by applying a low force between the suspension means (20) and the supporting elements (17). As a consequence of the lightweight construction of the color selection electrode (12), this force can be lowered to about 4 newtons.
A color display tube (1) comprising a display window (3) with a circumferential upright edge and corner areas (18), a color selection electrode (12) comprising corner sections (16) to which suspension means (20) are coupled, which color selection electrode (12) is suspended from supporting elements (17) having free end portions (22), secured to the corner areas (18), characterized in that the free end portions (22) have a diameter which is smaller than 5 mm for display windows having a width of more than 600 mm and smaller than 4 mm for display windows having a width of less than 600 mm.
Dependencies are inferred from the claim text.