Driver circuit for capacitive display elements
US6556177B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 14, 2000 |
| Grant date | Apr 29, 2003 |
| Priority date | — |
| Expiry date | Apr 14, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2330/023
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A display panel having plural capacitive elements such as electroluminescent elements is driven by an integrated circuit connected between the display panel and a power source. A pair of power transistors such as MOSFETs is connected between the power source and the integrated circuit. The capacitive elements are selectively charged and discharged by operating switching elements in the integrated circuit. The pair of transistors disposed separately from the integrated circuit is turned on or off after the switching elements in the integrated circuit are closed, so that the switching loss only occurs in the transistors outside the integrated circuit, thereby suppressing temperature rise in the integrated circuit. A pair of resistors may be used in place of the transistors to divide a voltage supplied to the capacitive elements between the resistors and the integrated driver circuit. A step-recycle circuit including a condenser for recycling a part of energy stored in the capacitive elements may be further connected between the power source and the pair of transistors, to further reduce power consumption in the integrated circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.