Samsung Display Co., Ltd.

Korea Advanced Institute of Science and Technology

Bo-Yeon Kim

Oh-Jo Kwon

Won-Tae Choi

Hee-Sun Ahn

Joo-Hyung Lee

Gyu-Hyeong Cho

Hyun-Sik Kim

Hak-Sun Kim

Jun-Suk Bang

A display apparatus includes a display panel configured to display an image and comprises a plurality of gate lines, a plurality of data lines and a plurality of pixels connected to the plurality of gate lines and the plurality of data lines. A signal comparing circuit may be configured to compare an image data of an image currently being displayed with an image data of an image to be displayed subsequently, and to store a comparison data resulting from a comparison of the image data. A pre-charge controller may be disposed in the display panel and may pre-charge the plurality of data lines with predetermined voltage level based on the comparison data.

Display apparatus and method employing pre-charging based on image data comparison

An organic light emitting display device includes pixels positioned at crossing regions between data lines and scan lines, each of the pixels including an organic light emitting diode, a scan driver configured to supply a scan signal to scan lines, a data driver configured to drive the data lines, wherein the data driver includes, in each channel, a supply part comprising a digital-to-analog converter configured to generate data signals using second data supplied from outside in a driving period, and a deterioration part configured to measure deterioration information of the organic light emitting diode using the digital-to-analog converter in a sensing period.

Organic light emitting display device configured to measure deterioration information, and driving method thereof

There are disclosed a DC-DC converter and an organic light emitting display including the same. The DC-DC converter includes a first voltage generator that has an inductor and a plurality of transistors, and converts an input voltage into a first voltage and outputs the first voltage to a first output terminal. The DC-DC converter also includes a controller that controls driving of the first voltage generator by supplying a first driving pulse to each transistor of the first voltage generator. In the DC-DC converter, the amplitude of the first driving pulse is adjustable. Accordingly, it is possible to provide a DC-DC converter and an organic light emitting display including the same, which can achieve high power conversion efficiency by change a driving pulse used in a DC-DC converter.

DC-DC converter and organic light emitting display including the same

An error compensator and an organic light emitting display device using the same. The organic light emitting display device includes pixels each having a driving transistor and an organic light emitting diode; and a sensing unit extracting at least one of a first information including the threshold voltage of the driving transistor or a second information including the degradation of the organic light emitting diode from a pixel of the pixels. In the organic light emitting display device, the sensing unit includes an amplifier amplifying a voltage corresponding to the at least one of the first information or the second information; and an error compensator compensating for error components of elements included in the amplifier and the error compensator.

Error compensator and organic light emitting display device using the same

A current generating circuit includes a reference voltage generating unit, a clock signal generating unit, a reference current generating unit, and a current mirror unit. The reference voltage generating unit generates a first reference voltage and a second reference voltage. The clock signal generating unit generates clock signals. The reference current generating unit generates a reference current corresponding to a selection signal based on the first reference voltage. The current mirror unit supplies a first current and a second current based on the reference current. A capacitor charges voltage based on the second current. A selection signal generating unit counts clock signals during a period in which a voltage charged in the capacitor is less than the second reference voltage, and outputs the selection signal based on the counted result.

Adjustable reference current generating circuit and method for driving the same

An organic light emitting device is provided. The organic light emitting device includes an organic light emitting panel, a drive unit receiving image data and image luminance discrimination signal that includes information on a maximum luminance of the image and providing a data voltage corresponding to the image luminance discrimination signal to the organic light emitting panel, and a power supply unit providing a common voltage to the organic light emitting panel. The common voltage is varied to correspond to the image luminance discrimination signal.

Organic light emitting device

A current memory cell includes an amplifier, transistor, first and second capacitors, and first to third switching units. The amplifier includes first to third terminals. The transistor is coupled to first and second nodes, and ground. The first capacitor is coupled between the second node and ground. The second capacitor is coupled between a third node and ground. The first unit couples a current source to the first node during a first period and an output line to the first node during a second period. The second unit couples the first node to the second node during the first period. The third unit couples the first terminal to the second node and couples the second and third terminals to the third node during the first period, and couples the first terminal to the third node and couples the second and third terminals to the second node during the second period.

Growing community of inventors

Yongin, South Korea

Bo-Yeon Kim