Patent ID: 6829019
Filing Date: 2004-12-07
Classification: H04N

Abstract:
A picture display device comprising a cathode ray tube (1) having a means (5) for generating at least one electron beam (6,7,8), a display window (2) with a display screen (10) having phosphor patterns comprising parallel aligned phosphor lines (R,G,B), said display screen being provided with an index system (20) comprising a plurality of index elements (21) extending substantially parallel to the phosphor lines, and a means (9) for deflecting the electron beams (6,7,8) across the display screen (10) parallel to the phosphor lines to scan the display screen, the display device having no colour selection electrode in front of the display screen, and the display device comprising means for imparting video information to the at least one electron beam (6,7,8), the image being written in a sequence of video lines, characterized in that the at least one electron beam is scanned across phosphor lines, the phosphor lines are arranged in the colour sequence A-B-C-B-A-B-C, etc., where A, B and C stand for red, green and blue phosphors or any mutation of said colours, wherein, during a scan, the at least one electron beam substantially scans a single phosphor line, and, in operation, the video lines overlap such that each B phosphor line is written in a single video line and each A and C phosphor line is written by two video lines.