Electron-beam generating device having plurality of cold cathode elements, method of driving said device and image forming apparatus applying same
US6445367B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 12, 1995 |
| Grant date | Sep 3, 2002 |
| Priority date | — |
| Expiry date | Jun 12, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J2201/3165
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for driving an electron source in which a high-quality image display is presented by correcting a non-uniform effective current distribution caused in cold cathode elements by leakage current. A digital video signal enters a shift register where a serial-to-parallel conversion is made for each line of an image based upon a shift clock signal. One line of the image data that has been subjected to the serial-to-parallel conversion is latched in a latch circuit and then applied to a voltage modulating circuit. The latter voltage-modulates the input data and sends the modulated signal to a voltage/current converting circuit. The latter converts the voltage quantity to a current quantity, which is applied to each of the cold cathode elements of a display panel through respective column terminals. A voltage V1 is applied to the selected row wire, and a voltage V2 (V2≠V1) is applied to all other row wires, for controlling the leakage current.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.