Flat type color cathode ray tube
AssigneeLG. Philips Displays Korea Co., Ltd.
InventorsYong Kun Kim, Yoon San Park, Hyeon Soo Hong
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Abstract
Disclosed is a flat type color cathode ray tube of high quality, which is capable of maintaining a brightness and brightness uniformity of an image while improving contrast, thereby ensuring flatness and visual distinction of the image. The flat type color cathode ray tube comprises a panel having an outer surface which is substantially flat and an inner surface which takes a predetermined curvature. The panel possesses at a center part thereof a transmittance of 45%˜75%, and the inner surface of the panel possesses an on-diagonal-axis curvature RD which satisfies a correlation, 3.5R≦RD≦8.0R where R is a product of 1.767 and a diagonal length of an effective surface along a diagonal axis.
Claims13
A flat type color cathode ray tube comprising:
- a rectangular panel having an outer surface which is substantially flat and an inner surface which takes a predetermined curvature, the rectangular panel being formed with a skirt part which extends substantially perpendicularly to the inner and outer surfaces;
- a shadow mask for performing a function of selecting colors of emitted electron beams in the panel;
- a frame for applying tensioning force to the shadow mask and supporting the shadow mask;
- a funnel coupled to a rear end of the panel to maintain the inside of the panel under a vacuum pressure;
- a tubular neck section extending rearward from a rear end of the funnel;
- an electron gun mounted in the neck section to emit electron beams;
- and
- a deflection yoke surrounding a circumferential outer surface of the funnel to deflect electron beams;
- wherein the panel possesses at a center part thereof a transmittance of 45%˜75%, and the inner surface of the panel possesses an on-diagonal-axis curvature RD which satisfies the following inequality (1):
- 3.5R≦RD≦8.0R (1).
A flat type color cathode ray tube comprising:
- a rectangular panel having an outer surface which is substantially flat and an inner surface which takes a predetermined curvature, the rectangular panel being formed with a skirt part which extends substantially perpendicularly to the inner and outer surfaces;
- a shadow mask for performing a function of selecting colors of emitted electron beams in the panel;
- a frame for applying tensioning force to the shadow mask and supporting the shadow mask;
- a funnel coupled to a rear end of the panel to maintain the inside of the panel under a vacuum pressure;
- a tubular neck section extending rearward from a rear end of the funnel;
- an electron gun mounted in the neck section to emit electron beams;
- and
- a deflection yoke surrounding a circumferential outer surface of the funnel to deflect electron beams;
- wherein the panel possesses at a center part thereof a transmittance of 45%˜75%, and the inner surface of the panel possesses an on-diagonal-axis curvature RD which satisfies the following inequality (2):
- 4.0R≦RD≦5.0R (2).
A flat type color cathode ray tube comprising:
- a rectangular panel having an outer surface which is substantially flat and an inner surface which takes a predetermined curvature, the rectangular panel being formed with a skirt part which extends substantially perpendicularly to the inner and outer surfaces;
- a shadow mask for performing a function of selecting colors of emitted electron beams in the panel;
- a frame for applying tensioning force to the shadow mask and supporting the shadow mask;
- a funnel coupled to a rear end of the panel to maintain the inside of the panel under a vacuum pressure;
- a tubular neck section extending rearward from a rear end of the funnel;
- an electron gun mounted in the neck section to emit electron beams;
- and
- a deflection yoke surrounding a circumferential outer surface of the funnel to deflect electron beams;
- wherein the panel possesses at a center part thereof a transmittance of 45%˜75%, and the panel further possesses a wedge rate as a thickness ratio between the center part and a diagonal end part of the panel, which satisfies the following inequality (9):
- 1.4≦wedge rate≦2.0 (9).
Dependencies are inferred from the claim text.