发明名称 |
Illumination device for liquid crystal display apparatus |
摘要 |
An illumination device for a liquid crystal display apparatus to be disposed on a back side of a liquid crystal display panel is constituted by a plurality of illumination circuits, and plural hot cathode tubes including at least one hot cathode tube associated with each illumination circuit. Each illumination circuit includes a life detection circuit for detecting an end of life of a hot cathode tube, and a turn-off circuit for turning off the hot cathode tube depending on an output of the life detection circuit. Each illumination circuit controls said at least one hot cathode tube associated therewith independently from the other hot cathode tubes. As a result, even when a hot cathode tube approaches its end of life, the illumination device can be partially turned off to allow an operator to continue the operation on the liquid crystal display apparatus.
|
申请公布号 |
US5808597(A) |
申请公布日期 |
1998.09.15 |
申请号 |
US19960610416 |
申请日期 |
1996.03.04 |
申请人 |
CANON KABUSHIKI KAISHA |
发明人 |
ONITSUKA, YOSHIHIRO;TAKABAYASHI, HIROSHI;KANDA, TOSHIYUKI |
分类号 |
G02F1/13357;H05B37/03;H05B41/46;(IPC1-7):G09G3/36 |
主分类号 |
G02F1/13357 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|