Samsung Electronics Co., Ltd.

Ji-Woon Jung

Yong-Weon Jeon

Hyung-Tae Kim

Hyo-sun Shim

Won-chang Jang

Jong-Kon Bae

Won-sik Kang

Jae-hyuck Woo

In-Suk Kim

Yang-Hyo Kim

Il-Kwon Chang

Hyun-chang Shin

Sun-min Park

Hyo-Sun Shim

Jeong-ah Ahn

Beop-Hee Kim

Jo-Hyun Ko

Provided are an output buffer circuit having an amplifier offset compensation function and a source driving circuit including the output buffer circuit. The output buffer circuit may include a plurality of channel amplifiers, each of which is configured to adjust an amount of current flowing through transistors connected to at least one of a non-inverted input terminal and an inverted input terminal of a differential input unit to compensate an amplifier offset, and adjust buffer input voltage signals to generate output voltage signals.

Buffer circuit having amplifier offset compensation and source driving circuit including the same

A method and an apparatus for automatically connecting a short range wireless network in a portable terminal. The method for automatically connecting a short range wireless network in the portable terminal includes, when registering to an Access Point (AP), storing location information of the AP. The method also includes obtaining location information of the terminal. The method further includes controlling an activation cycle of a communication module by comparing the location information of the terminal and the location information of the AP. The method still further includes, when the communication module is activated, searching for the AP.

Method and apparatus for automatically connecting short range wireless network in portable terminal

A voltage level conversion circuit includes a voltage switch circuit and a level shift circuit. The voltage switch circuit is configured to sequentially output an intermediate voltage and a conversion voltage in response to a switch signal. The level shift circuit is configured to latch a voltage level corresponding to an input signal using the intermediate voltage, and to convert the latched voltage level using the conversion voltage to generate an output signal.

Voltage level conversion circuits and display devices including the same

Method and apparatus for activating a slave device are provided. The method including: receiving communication medium scan signals comprising a slave device identifier; controlling a main power supply when the slave device is in an inactive state; determining whether the slave device is completely booted; and executing an upper layer communication when the slave device is completely booted.

Method and apparatus for activating device

A display driving device a driving unit, an output unit, and an output control unit. The driving unit includes a first buffer and a second buffer generating a first driving voltage and a second driving voltage, respectively. The output unit includes a first output pad and a second output pad to which voltages are respectively applied via first second data driving paths, respectively, and which output the voltages to outside. The output control unit includes a charge share path that connects the first output pad and the second output pad. Each of the first data driving path and the second data driving path includes a first electro-static discharge (ESD) protection element, and the charge share path includes a second ESD protection element that is disposed separately from the first data driving path and the second data driving path.

Display driving device and display system with improved protection against electrostatic discharge

A method to control a portable audio device in a power-saving mode using a wireless headset includes transmitting a host wake-up signal (HOST_WAKEUP) according to a signal requesting reproduction of music transmitted from the wireless headset, transmitting a control signal corresponding to the host wake-up signal, and controlling the portable audio device according to the control signal to switch the portable audio device out of the power-saving mode and to supply power to at least one component in the portable audio device used to reproduce music.

Method and apparatus for controlling portable audio device

Embodiments of the invention provide a digital-to-analog converter (DAC) that is configured to process upper data bits, a control data bit, and a lower data bit using two decoders and a control logic. The resulting DAC provides high resolution output using a minimum circuit area. Embodiments of the invention also provide a sample and hold circuit for a DAC that reduces the effects of parasitic capacitance at the input of an operational amplifier (OP-AMP).

Digital to analog converter with minimum area and source driver having the same

A method and apparatus for map-updating of a navigation system by automatically generating point of interest (POI) data that is not registered and automatically generating a POP alias of POI data that is already registered, the method including: logging at least one piece of point of interest (POI) data if the POI data input in order to find a destination is not found in the navigation terminal; and registering the logged at least one piece of POI data as a candidate POI alias of newly input POI data if a destination designated by the navigation terminal according to the newly input POI data is equal to an arrived destination.

Method and apparatus for map-updating of navigation system

A digital/analog converting driver and a digital/analog converting method, in which the digital/analog converting driver converts digital data having M+N (M and N are integers) bits into an analog voltage and includes a first converting unit, a second converting unit, and an analog voltage outputting unit. The first converting unit converts successive M bits of the digital data into a first voltage. The second converting unit converts successive N bits of the digital data into a second voltage. The analog voltage outputting unit adds the first voltage and the second voltage and outputs the added voltage as the analog voltage. The output range of the first voltage is different from that of the second voltage.

Digital/analog converting driver and method

A digital to analog converter (DAC) converting digital data into a corresponding analog voltage is disclosed. The digital data includes upper bit data and lower bit data and the DAC includes; a first resistor circuit dividing first and second reference voltages to output a plurality of first division voltages, a first decoder selecting one of the first division voltages in response to the upper bit data, a second resistor circuit dividing third and fourth reference voltages to output a plurality of second division voltages, a second decoder selecting one of the second division voltages in response to the lower bit data, and a sample and hold circuit including a first capacitor and a second capacitor, and outputting the analog voltage in response to an output voltage from the first decoder and an output voltage from the second decoder, wherein the sample and hold circuit samples the output voltage of the first decoder during a sample mode, and adds the output voltages of the first and second decoders through the first and second capacitors to output a combined voltage during a hold mode.

Digital to analog converter and source driver

A gamma signal supplying apparatus includes a timing controller for storing predetermined gamma values as digital values, and for transmitting one of the digital values serially. The gamma supplying apparatus may further include a gamma digital-to-analog controller (DAC) for receiving the serial digital gamma value, and for converting the serial digital gamma value into a first analog gamma value, and a plurality of column drive units, each of the plurality of column drive units for generating a second analog gamma value, for comparing the second analog gamma value to the first analog gamma value, and for outputting a gray level value based on the second analog gamma value if both values are substantially identical.

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Seoul, South Korea

Ji-Woon Jung