Koninklijke Philips Corporation N.v.

Leendert Vriens

Rudolf Maria Jozef Voncken

Dani&euml;l Den Engelsen

The CRT has a tensioned shadow mask with between 160-180 or between 210 and 240 slits per row and display devices having such CRT's. The first embodiment is in particular suited for CRT''s having a screen size larger than 21&Prime; and for TVT applications, giving a substantially Moire free image for an NTSC, PAL and VGA signal, the second embodiment is in particular suited for CRT's having a screen size of 23&Prime; or smaller and for CMT applications, giving a substantially Moire free image for a SVGA and XGA signal.

CRT with improved slotted mask

A cathode ray tube having a tensioned shadow mask with elongated holes, i.e. holes with a length longer than 5 mm. The pattern of holes repeats itself after 5 or more rows and the relation between the number of rows after which the pattern repeats itself, the vertical pitch a and the horizontal pitch d is given by a /d &lE;n &lE;8a /d , most preferably n &ap;2a /d .

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Knegsel, Netherlands

Leendert Vriens