| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a field emission backlight device of a triode type. <P>SOLUTION: A driving method of the field emission backlight device includes grounding of a cathode electrode and applying (+) and (-) bipolar pulse power source to a gate. The pulse power source has a constant duty ratio, and when (+) voltage is applied to the gate, electrons are emitted to the gate from an emitter composed of carbon nanotubes on the cathode electrode, and when (-) voltage is applied, electrons are emitted to the cathode electrode from the carbon nanotubes on a gate upper face. While electrons are emitted, the emitted electrons are accelerated by applying a high voltage and the accelerated electrons make a phosphor coated on an upper face of an anode electrode emit light. Since the electrons are emitted from both sides of the cathode electrode and the gate, an effective area as the emitter out of the whole substrate area is not only widened in double, but also a life of the carbon nanotube emitter can be made longer and efficiency of a planar light emitting device can be improved. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
