Back to results
US 6,806,636 B2Granted
Flat CRT with improved coating
AssigneeLG Electronics Inc.
InventorsCheon Su Kang, Sung Ho Park
Life of this patent
Estimating the term…
Abstract
A CRT display including a display panel having a substantially flat outside surface, and an inside surface with a substantially fixed curvature includes a film coating with a non-uniform transmissivity. The film coating's transmissivity is varied, as a function of position, to compensate for variations in transmissivity exhibited by the display panel, thus resulting in substantially uniform image brightness across the surface of the CRT.
Claims18
A flat cathode ray tube (CRT), comprising:
- a panel having a substantially flat outside surface, and an inside surface with a substantially fixed curvature;
- a black filter film coated on the inside surface of the panel configured to improve contrast and,
- a film coating on the outside surface of the panel configured to reduce reflections or antireflection static electricity,
- wherein a panel thickness ratio of a panel edge to a panel center is greater than approximately 170% and a transmissivity y of the panel film coating at adifferent positions on a diagonal axis A, a short axis B, and a long axis C, of the panel is expressed according to:
- for the diagonal axis, A:
- 0.8624x2−2.0957x+73.71≦y≦0.8643x2−2.0957x+76.72,
- for the short axis, B:
- 0.2571x2−0.5229x+72.69≦y≦0.2571x2−0.5229x+75.66,
- for the long axis, C:
- 0.5000x2−1.0600x+72.99≦y≦0.5000x2−1.0600x+75.96,
- wherein x denotes an integer ranging from 1-3, indicating a position on the short, long, or diagonal axis.
8 more elements
A flat cathode ray (CRT), comprising:
- a panel having a substantially flat outside surface, and an inside surface with a substantially fixed curvature;
- and,
- a film coating coated on the outside surface of the panel far antireflection and/or antistatic electricity,
- wherein transmissivity y of the film coating at different positions on diagonal axis A, a short axis B, and a long axis C is expressed according to the following equations:
- for the diagonal axis, A:
- 0.8643x2−2.0957x+59.71≦y≦0.8643x2−2.0957x+62.72,
- for the short axis, B:
- 0.2571x2−0.5229x+58.69≦y≦0.2571x2−0.5229x+61.66,
- for the long axis, C:
- 0.5000x 2−1.0600x+58.99≦y≦0.5000x2−1.0600x+61.96,
- and x denotes an integer ranging from 1-5, indicating a position on the short, long, or diagonal axis.
8 more elements
A CRT, comprising:
- a display panel comprising a substantially flat outer surface and an inner surface with a substantially fixed curvature, wherein the display panel exhibits a first transmissivity that varies as a function of position on the display panel;
- a film coating on said outer surface with a second transmissivity that vanes as a function of position on the film coating, and as a function of said first transmissivity, wherein a said first transmissivity and said second transmissivity at any position between a display panel center and a display panel edge is within approximately 1.6% of a sum of said first transmissivity and said second transmissivity at any other position between said display panel center and said display panel edge.
A coating for an image displaying CRT, comprising:
- a film configured to reduce a variation in image brightness caused by a variation in a transmissivity of said CRT, wherein a sum of a transmissivity of said film and a transmissivity of said CRT at all positions on said CRT varies by no more than approximately 1.6%.
Dependencies are inferred from the claim text.