Samsung Electronics Co., Ltd.

Chong-Chul Chae

Kyong-Ju Shin

Nam-Seok Roh

Seung-Hwan Moon

Joon-Hoo Choi

Cheol-Woo Park

Mun-Pyo Hong

Kyoung-Ju Shin

Jin-Hong Kim

Woong-Kyu Min

Beohm-Rak Choi

A shift register comprises stages connected to each other, in which each stage generates an output signal in response to any one of clock signals and an output from each of two different stages. Each clock signal has a duty ratio of less than 50% and a different phase from each of the other clock signals. A display device includes pixels, signal lines, and first and second shift registers each having stages connected to each other and generating output signals to signal lines. Each stage includes a set terminal, a reset terminal, a clock terminal, and first and second output terminals.

Shift register and display device including the same

A photosensor is provided, which includes a sensor, a reference voltage generator and a processor. The sensor receives an external light and generates a sensing voltage in response to an amount of the external light received. The reference voltage generator is blocked from the external light and generates a reference voltage. The processor receives the sensing voltage from the sensor and the reference voltage from the reference voltage generator to generate a sensor output voltage in response to a difference between the sensing voltage and the reference voltage.

Photosensor and display device including photosensor

A liquid crystal display is provided. Red, blue and green pixels are sequentially arranged in a row direction. The red pixels and the green pixels are alternately arranged in a column direction and the blue pixels are arranged in the column direction. Four red and green pixels surrounding adjacent two blue pixels in neighboring two pixel rows face each other. Pixel electrodes and a common electrode have cutouts. A ratio of horizontal to vertical of each pixel is equal to 2:3. In this structure, a PenTile Matrix driving provides high resolution images, and the control of the arrangement of the liquid crystal molecules by the cutouts of the pixel electrode and the common electrode and the common electrode provides wide viewing angle.

Liquid-crystal display having a particular ratio of horizontal to vertical for each pixel

A pixel circuit of an organic EL display includes an EL device, first and second switching devices, a driving thin film transistor, and a capacitor. The first switching device switches data voltages applied to data lines in response to the selection signal applied to a scan line and the second switching device connects gate and drain of the driving thin film transistor in response to a compensation signal applied to a compensation line. The driving thin film transistor supplies electric current to the organic EL device in response to the data voltage inputted to a gate from the first switching device and the capacitor maintains the data voltage applied to the gate of the driving thin film transistor for a predetermined period. At this time, the characteristic deviation of the transistor is compensated by connecting the gate and the drain of the driving thin film transistor by applying the compensation signal to the compensation line before applying the data voltage, and then the data voltages are applied to the data lines after cutting off the compensation signal. In this manner, the characteristic deviation of the driving thin film transistors can be compensated.

Organic electroluminescent display and driving method thereof

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Seoul, South Korea

Chong-Chul Chae