Global Oled Technology LLC

Other

Nobuyki Mori

Seiichi Mizukoshi

Makoto Kohno

Kazuyoshi Kawabe

An object of the invention is to convert input RGB data to R'G&#x2032;B&#x2032;W data without suffering loss of gradations of the input RGB data. A display panelis configured having unit pixels made up of subpixels of RGBW (red, green, blue, white). In an RGB&#x2192;R&#x2032;G&#x2032;B&#x2032;W conversion section, conversion is carried out under conditions that usage rate of W is less than 100%, and a bit width of input RGB data us larger than a bit width of R&#x2032;G&#x2032;B&#x2032;W data after conversion. In the RGB&#x2192;R&#x2032;G&#x2032;B&#x2032;W conversion section, R1G1B1values and W values are determined so that an absolute value of a sum of values obtained by multiplying differences between respective RGB data input and respective RGB components in R&#x2032;G&#x2032;B&#x2032;W data after conversion by a weight, becomes minimum.

Display device

To alleviate an afterimage phenomenon caused by a hysteresis characteristic of a drive transistor. Current driven type light emitting elementsare provided for each of pixelsthat are arranged in a matrix shape, and current of the light emitting elementsis controlled using drive TFTsthat operate by receiving data voltage on a gate. At least two power supply voltages (PVDDa, PVDDb) for supply to each pixel are provided, one being set to a voltage such that current corresponding to a data voltage flows in the drive TFT, the other being set to a voltage beyond a variation range of data voltage and that reverse biases the drive TFT, and the two power supply voltages are switched and supplied to each pixel

There is provided a display device in which disadvantageous effects due to unnecessary operations of an image lag alleviating function are minimized. In a display device of active matrix type, for each of the pixels arranged in a matrix, a current-driven emissive element is provided, and the current of the emissive element is controlled using a drive TFT so as to perform display. While a black display period during which an opposite bias voltage is applied between the gate electrode and the source electrode of the drive TFT is inserted in order to alleviate image lag, this insertion is performed only when a predetermined condition is satisfied, and is performed for a certain duration according to a command by a microcomputer ().

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Asaka, Japan

Nobuyki Mori