Display device having an electron gun with pre-focusing lens portion
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United States of America Patent
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Issued Date -
Jun 15, 2006
app pub date -
Dec 12, 2003
filing date -
Dec 19, 2002
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
This invention relates to a display device comprising a cathode ray tube (1), the cathode ray tube having an electron gun (7) comprising a pre-focusing lens portion, for generating a pre-focusing lens field (22), and a main lens portion, for generating a main lens field (23). The electron gun (7) further comprises an additional grid (10), being positioned in proximity with said main lens portion, whereby a potent Vgx is arranged to be applied to said additional grid (10), for generating, together with one of the potentials Vfoc or Vdyn, an additional lens field in proximity with said main lens field, whereby, in operation, the main lens field and the additional lens field is arranged to cooperate to form an effective main lens field.
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