Colour display tube

Details Colour display tube Colour display tube

H - Electricity

01

J

313/35.16

H01J 29/07 (2006.01) H01J 9/02 (2006.01)

Patent

CA 1180368

ABSTRACT The invention relates to a colour display tube comprising a colour selection electrode placed before the display screen. The colour selection electrode is coated at least on the side remote from the display screen with a layer which comprises between the colour selection electrode apertures 0.2 to 2 mg/cm2 of a heavy metal or a heavy metal compound. The heavy metal has an atomic number exceeding 70. Such a layer has a high electron reflection coefficient so that of the electron impinging on the colour selection electrode less energy is absorbed by the colour selection electrode. As a result of this the overall doming or local doming of the colour selection electrode treated according to the invention caused by thermal expansion is smaller than in a colour selection electrode not provided with such a layer. This results in a correspondingly smaller move- ment of a target formed on the display screen via a colour selection electrode aperture, as a result of which a qualitatively better colour picture is obtained.

381364

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