| US 7,586,272 B2 | ||
| Cold cathode fluorescent lamp, cold cathode fluorescent lamp driving apparatus, cold cathode fluorescent lamp apparatus, liquid crystal display apparatus, control method for cold cathode fluorescent lamp, and control method for liquid crystal display apparatus | ||
| Makio Iida, Tokyo (Japan); and Norimasa Furukawa, Tokyo (Japan) | ||
| Assigned to Sony Corporation, (Japan) | ||
| Filed on Jun. 07, 2006, as Appl. No. 11/448,438. | ||
| Claims priority of application No. P2005-168095 (JP), filed on Jun. 08, 2005; and application No. P2006-120215 (JP), filed on Apr. 25, 2006. | ||
| Prior Publication US 2006/0284565 A1, Dec. 21, 2006 | ||
| Int. Cl. H05B 37/02 (2006.01) | ||
| U.S. Cl. 315—291 [315/246; 315/260; 315/DIG. 1; 313/607] | 15 Claims |
| 1. A driving apparatus for driving a cold cathode fluorescent lamp which includes an optically transparent sealed vessel containing
a gas and having a fluorescent material disposed on an inner surface thereof, the gas emitting light when electrons collide
therewith, and the fluorescent material reacting with the light, first and second internal electrodes disposed inside the
sealed vessel and formed at least partially from an electron emitting material, and first and second external electrodes disposed
in a spaced relationship from each other on an outer surface of the sealed vessel, the driving apparatus comprising:
a dc driving circuit operable to apply a dc voltage between the first and second internal electrodes;
an ac driving circuit operable to apply an ac voltage between the first and second external electrodes; and
a changeover circuit operable to control the dc driving circuit and the ac driving circuit such that the ac voltage is applied
for a predetermined period of time to cause the electrons and the gas to collide with each other and the dc voltage is applied
while the collisions between the electrons and the gas continue.
|