US 8,009,125 B2 · Organic electroluminescent display device

Abstract

In an organic electroluminescent (EL) display device, a main display panel and a sub display panel share a data line and a power supply voltage line. The organic EL display device has a top emission type main display panel and a bottom emission type sub display panel in a single display panel. The main display panel is composed of main pixels, each having a compensation circuit for compensating a threshold voltage, and the sub pixel display is composed of basic sub pixels without any compensation circuit. Each of the sub pixels has a boost capacitor which increases a data voltage, and which is disposed between a scan line and a storage capacitor so as to use the same voltage and power supply voltage as the main pixels. The sub pixels having the boost capacitor are disposed in the sub display panel, so that the main and sub display panels share the data line and the power supply voltage line.

Claims20

Dependent claims

An organic electroluminescent (EL) display device, comprising:

a main display panel having a plurality of main pixels for displaying a main image;
a sub display panel having a plurality of sub pixels for displaying a sub image;
a main scan driver for applying a main scan signal for selecting the main pixels;
a sub scan driver for applying a sub scan signal for selecting the sub pixels;
and
a main/sub data driver for supplying one of a main data signal and a sub data signal to one of the main pixels and the sub pixels;
wherein the main pixels and the sub pixels arranged in the same column share a same data line and a same power supply voltage line.

4 more elements

An organic electroluminescent (EL) display device comprising a main display panel having a plurality of main pixels for displaying a main image and a sub display panel having a plurality of sub pixels for displaying a sub image, each of the sub pixels comprising:

an organic light emitting diode (MED) for emitting light at a luminance corresponding to a predetermined drive current;
a drive transistor connected between the OLED and a power supply voltage line for generating a drive current corresponding to a voltage applied to a gate terminal thereof;
a switching transistor connected between a data line and the gate terminal of the drive transistor for delivering a data voltage in response to a scan signal from a scan line connected to the gate terminal;
a storage capacitor having a first electrode connected to the power supply voltage line and a second electrode connected to the gate terminal of the drive transistor for temporarily storing the data voltage for a constant period of time;
and
a boost capacitor connected between the scan line and the second electrode of the storage capacitor for increasing a voltage of the gate terminal of the drive transistor in response to the scan signal converted to a high level.

3 more elements

Dependencies are inferred from the claim text.

Organic electroluminescent display device

Life of this patent

Organic electroluminescent display device

Life of this patent

Abstract

Claims20