Back to results
US 5,347,197 AGranted
Display device having a display tube including a cold cathode and a current mirror drive circuit for the cold cathode
AssigneeU.S. Philips Corporation
InventorsTerence Doyle, Matheus J. G. Lammers
Life of this patent
Estimating the term…
Abstract
A display device having a display tube including a cold cathode, for example a PN emitter (PNE), has the terminals of the PN emitter (PNE) coupled between first terminals of a first (CR1) and a second (CR2) current mirror. The first current repeater (CR1) is connected to an output of an amplifier (AMP) whose feedback input (FI) is connected to second terminals of the first (CR1) and second (CR2) current mirrors.
Claims3
A display device having a display tube including a cold cathode, said display device comprising:
- amplifying means having a signal input and a feedback input;
- first current mirror means coupled to said amplifying means and having a first terminal and a second terminal;
- second current mirror means having an input and an output;
- said cold cathode having a first end coupled to said first terminal of said first current mirror means, and a second end coupled to said input of said second current mirror means;
- and
- feedback means having a first end coupled to said second terminal of said first current mirror means and to said output of said second current mirror means, and a second end coupled to said feedback input of said amplifying means.
3 more elements
Dependencies are inferred from the claim text.