Sharp Kabushiki Kaisha Corporation

Masahito Sano

Kohhei Tanaka

Ryo Yonebayashi

Kazuatsu Ito

Adnan Heganovic

Hirohide Mimura

The present application discloses a display device, such as an organic EL display device, which is of a current-driven type and is capable of displaying a satisfactory image free from perceivable flickering across all areas of the image even when pause drive is performed. Each pixel circuit is provided with a bias supply circuit, which includes a bias retention capacitor Cbs and a bias control transistor Tconnected in series with each other. In a pause drive mode, emission control lines and bias control lines are driven during both drive and pause periods. The bias control transistor is controlled through the bias control line such that in the drive period, a voltage of a data signal line Dj is written to a data retention capacitor Cst and simultaneously to the bias retention capacitor Cbs, whereas in the pause period, the voltage written in the bias retention capacitor Cbs is applied to a source terminal of a drive transistor during an on-bias application period within a non-emission period.

Pixel circuit, display device, and method for driving same

A display device includes: a first gate insulating film; a first interlayer insulating film; a lower metal layer; an oxide semiconductor layer; a second gate insulating film; a second gate electrode; a second interlayer insulating film; and an upper metal layer being sequentially provided on a substrate, wherein the oxide semiconductor layer includes a second channel region and a second conductor region, the second gate insulating film is disposed in alignment with the second gate electrode, a first contact hole is provided in the first gate insulating film and the first interlayer insulating film, the lower metal layer includes a second conductor connection wiring line, a protection layer having an island shape is provided between the second conductor region and the second interlayer insulating film, a second contact hole exposing the second conductor connection wiring line is provided in the protection layer and the second interlayer insulating film.

Display device

A pixel circuit includes a drive transistor configured to control an amount of current to a light emitting device during an emission phase depending upon a voltage applied to a control terminal of the drive transistor, the drive transistor having a first terminal and a second terminal. During a first phase, an anode of the light emitting device is set to a reference voltage and the first terminal of the drive transistor is set to a fixed data voltage such that the drive transistor is stressed with a fixed source-to-gate voltage to prevent a drift of a threshold voltage in the drive transistor thereby preventing a drift in screen brightness. During a second phase, the anode of the light emitting device is set to the reference voltage and the first terminal of the drive transistor is set to a voltage of the first power supply.

Growing community of inventors

Sakai, Japan

Masahito Sano