Cold cathode fluorescent lamp and liquid crystal display device
View Patent ↗A cold cathode fluorescent lamp includes a tube having an inner surface coated with a fluorescent film and tubular discharge electrodes disposed at both inner ends of the tube. Each discharge electrode has an opening facing a discharge area and includes a projection in the opening, the area of the projection being reduced by electric discharge.
1. A cold cathode fluorescent lamp comprising:
a tube having an inner surface coated with a fluorescent material; and
tubular discharge electrodes disposed at both inner ends of the tube, wherein
each discharge electrode has an opening facing a discharge area and includes a projection in the opening, the area of the projection being reduced by electric discharge, and
the projections each have a columnar shape and are made of a same material as the tubular discharge electrodes.
2. The lamp according to claim 1 , wherein the projection comprises a material containing tungsten.
3. The lamp according to claim 1 , wherein the projection is formed by sintering tungsten.
4. The lamp according to claim 1 , wherein each discharge electrode includes a plurality of projections.
5. A cold cathode fluorescent lamp comprising:
a tube having an inner surface coated with a fluorescent film; and
tubular discharge electrodes disposed at both inner ends of the tube, wherein
the tubular discharge electrodes each have an opening such that the openings face each other,
each tubular discharge electrode includes a projection in the opening so that the projection is easier to be sputtered than the inner surface of the discharge electrode, and
the projections each have a columnar shape and are made of a same material as the tubular discharge electrodes.
6. The lamp according to claim 5 , wherein the projection comprises a material containing tungsten.
7. The lamp according to claim 5 , wherein the projection is formed by sintering tungsten.
8. The lamp according to claim 5 , wherein each tubular discharge electrode includes a plurality of projections.
9. A liquid crystal display device comprising:
a liquid crystal display panel including two transparent substrates having electrodes for pixel formation and a liquid crystal layer sandwiched between the substrates; and
a backlight including at least one cold cathode fluorescent lamp that applies illumination light to the back of the liquid crystal display panel, wherein
the cold cathode fluorescent lamp includes:
a tube having an inner surface coated with a fluorescent film; and
tubular discharge electrodes disposed at both inner ends of the tube, wherein
each discharge electrode has an opening and includes a projection to be sputtered in the opening, and
the projections each have a columnar shape and are made of a same material as the tubular discharge electrodes.
10. The device according to claim 9 , wherein the projection comprises a material containing tungsten.
11. The device according to claim 9 , wherein the projection is formed by sintering tungsten.
12. The device according to claim 9 , wherein each discharge electrode includes a plurality of projections.