Voltage supply device having self-testing circuit
US6191967A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 19, 1999 |
| Grant date | Feb 20, 2001 |
| Priority date | — |
| Expiry date | May 19, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/40
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A device selectively supplying a high voltage and a ground level voltage to electrodes of an electroluminescent display panel. The voltage supply device includes a first and a second transistor connected in series, and outputs the high voltage upon turning on the first switching transistor and the ground level voltage upon turning on the second switching transistor. The device includes a circuit for selecting either an operation mode under which the device is normally operated with the high voltage or a test mode under which the device is tested under a low test voltage. The mode selection is performed by an external signal supplied to the device. Under the test mode, the switching transistors are turned on with a low gate voltage by operation of a circuit built in the device. Accordingly, the voltage supply device normally operated under the high voltage is easily tested under the low test voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.