Patent ID: 7586471

Claim:
A drive circuit for a panel display device for driving light-emitting devices arranged at respective intersections between a plurality of data lines and a plurality of scan lines, the drive circuit comprising: a voltage control circuit for charging said light-emitting devices to a voltage necessary for light emission by connecting said data lines to a predetermined power supply potential in a rising period prior to a period for selectively causing said light-emitting devices to emit light; and a drive control circuit for selectively connecting said data lines to a constant current source after said rising period, wherein said drive control circuit includes a first switch circuit for connecting each of said data lines to either one of said constant current source and a ground potential; and a second switch circuit for connecting each of said scan lines to either one of a power supply potential and a ground potential, wherein said voltage control circuit includes a third switch circuit for connecting or disconnecting each of said data lines to/from said predetermined power supply potential, and said light-emitting devices are selected or deselected by said first and second switch circuits, wherein when said light-emitting devices are selected, said second switch circuit connects said scan lines to said ground potential while said third switch circuit charges said light-emitting devices by connecting said data lines to said predetermined power supply potential for a predetermined period, and then said first switch circuit selectively causes said light-emitting devices to emit light by selectively connecting said data lines to said constant current source, and wherein when said light-emitting devices are not selected, said second switch circuit connects said scan lines to said power supply potential while said first switch circuit connects said data lines to said ground potential.