Abstract: Disclosed is a pixel circuit consisting of complementary N- and P-channel MOS field-effect transistors (or of thin-film transistors), a capacitor, and an organic light-emitting diode. This circuit stores a voltage signal that is used to control the amount of light emitted from the pixel by means of a CMOS inverter. This pixel circuit is used in a two-dimensional array to form an active-matrix OLED display. The amount of light emitted at each pixel during a frame time is controlled by dividing the frame time into many sub-frames (or fields) and changing the stored voltage at the beginning of each sub-frame in such a way that the integrated time a voltage is stored during a frame time determines the total amount of light emitted.

Abstract: Disclosed is a pixel circuit consisting of MOS field-effect transistors (or of thin-film transistors), a capacitor, and an organic light-emitting diode that stores a voltage signal that is used to control the amount of light emitted from the pixel. This pixel circuit is used in a two-dimensional array to form an active-matrix OLED display. The amount of light emitted at each pixel during a frame time is controlled by dividing the frame time into many sub-frames and changing the stored voltage at the beginning of each sub-frame in such a way that the integrated time a voltage is stored during a frame time determines the total amount of light emitted.

Abstract: A thin film light used in displays is disclosed. The thin film light is an organic light generating thin film located between two electrodes. One electrode facing the display is transparent, while another electrode is a reflective patterned electrode. The patterned electrode is aligned with pixel displays. At least one polarizer is used to provide a light or dark display background. The thin film light may be a backlight for transmission displays. Alternatively, the thin film light may be a frontlight for reflective displays, where display illumination and imaging are performed over the same front side of the reflective display.

Abstract: In the formation of organic light emitting diodes with a transparent top electrode, it was discovered that many of the materials used for this electrode can readily diffuse at room temperature into the organic films, creating shorts and otherwise compromising the performance of the diode. A solution to this problem is disclosed which involves a method for the creation of a diffusion barrier which prevents diffusion of electrode materials into the substrate while enhancing the ability of the OLED to emit light through the top electrode.