Patent attributes
An organic electroluminescent display device connected by a blocking diode in series to an organic light-emitting diode (OLED). Each pixel or subpixel of the electroluminescent display device comprises an OLED, a blocking diode to prevent the OLED from being reversed biased, a rectification diode to isolate the column electrode from unselected rows and a capacitor as a memory device. The charge stored in each memory capacitor may be increased by the blocking diode in series with each OLED. A frame period of the display device is divided into sub-frames that have address and light emission periods. Current mode data programming is used to address the device in each sub-frame. A ramp waveform is applied to the row electrode during the light emission period, to cause the capacitor to discharge through the OLED and control the forward current level.
