Samsung Electro-mechanics Co., Ltd.

Sungkyunkwan University

Hyun Suk Lee

Tah Joon Park

Yong Il Kwon

Byeong Hak Jo

Jung Hyun Lee

Moon Suk Jeong

Yoon Shik Hong

Sung Cheon Jung

Hyung Jin Choi

Jae Goon Aum

Ji Hoon Kim

Je Hyuk Ryu

Sang Hyun Min

Sang Ho Lee

Sang Hyun Sim

Kyung Uk Kim

Jung Eun Youm

Kang Joo Kim

Tae Hyeon Kwon

Se Bin Im

Jung Tae Kim

Young Ha Cho

Jung Soo Han

Ray Amiya

Kyung Hoon Won

There are provided a touchscreen device and a method of sensing a touch. The touchscreen device includes: a panel unit including a plurality of first electrodes and a plurality of second electrodes; a driving circuit unit simultaneously applying driving signals to M first electrodes among the first electrodes, where M is a natural number equal to or greater than two; a sensing circuit unit detecting capacitance generated in intersections between the first electrodes and the second electrodes so as to output sensing signals; and an operation unit determining whether a touch has occurred, based on the sensing signals.

Touchscreen device and method of sensing touch

A capacitance sensing apparatus includes: a driving circuit unit applying a driving signal of a first period to a node capacitor; a first integrating circuit unit integrating voltage charged in the node capacitor to generate output voltage of which a voltage level is changed twice during a second period; a buffer capacitor charged or discharged by the output voltage of the first integrating circuit unit; a second integrating circuit unit integrating voltage charged in the buffer capacitor to generate output voltage of which a voltage level is changed twice during the first period; and an amplifying unit differentially amplifying non-inverted output voltage and inverted output voltage of the second integrating circuit unit, wherein the amplifying unit amplifies voltage corresponding to a difference between the non-inverted output voltage and the inverted output voltage during a reset section of the second integrating circuit unit to generate offset information.

Capacitance sensing apparatus and touchscreen apparatus

There are provided a touch sensing device and a touchscreen device, the touch sensing device including a plurality of driving electrodes extended in a first axial direction, a plurality of sensing electrodes extended in a second axial direction intersecting with the first axial direction, an integrating circuit unit generating a first analog signal by integrating a change in capacitance generated in a first sensing electrode among the plurality of sensing electrodes and generating a second analog signal from a change in capacitance generated in a second sensing electrode adjacent to the first sensing electrode, and a subtracting unit calculating a difference in levels between the first and second analog signals.

Touch sensing device and touchscreen device

There are provided an apparatus for sensing capacitance, a method for sensing capacitance, and a touch screen apparatus. The apparatus for sensing capacitance includes; a first integration circuit unit including a first capacitor charged by a change in capacitance occurring in a sensing electrode; a comparison circuit unit comparing a level of an output signal of the first integration circuit unit with a predetermined reference level; and a noise removal unit including a plurality of switches operating according to an output of the comparison circuit unit, wherein the comparison circuit unit controls an operation of each of the plurality of switches to discharge charges charged in the first capacitor when the level of the output signal of the first integration circuit unit is higher than the reference level.

Apparatus and method for sensing capacitance, and touch screen apparatus

There are provided an apparatus for sensing capacitance, a method for sensing capacitance, and a touch screen apparatus. The apparatus for sensing capacitance includes; a driving circuit unit applying driving signals to a first capacitor; an integration circuit unit including a second capacitor and a third capacitor respectively charged by a change in capacitance generated in the first capacitor based on the driving signals to generate a predetermined output voltage and calculating a voltage difference between the output voltage of the second capacitor and the output voltage of the third capacitor; and a control unit determining characteristics of a noise signal based on the voltage difference and controlling the driving signals based on the characteristics of the noise signal.

There are provided a touchscreen device and a method of processing touch data. The touchscreen device includes: a panel unit including rows of first electrodes extending in a first direction and columns of second electrodes extending in a second direction intersecting the first direction; a sensing circuit unit sensing changes in capacitance in intersections of the first electrodes and the second electrodes; a signal conversion unit converting the changes in capacitance into a digital signal; and an operation unit creating a binary image in a matrix form having rows of the first electrodes and columns of the second electrodes based on the digital signal, and projecting the binary image onto every first electrode and every second electrode in the first and second directions, respectively, to create a projection mask including a plurality of bit masks.

Touchscreen device and method of processing touch data

There are provided a data processing method and a touch sensing apparatus. The data processing method includes (a) obtaining a plurality of pieces of sensing data according to one or more touch inputs; (b) selecting one or more pieces of temporary reference data having the minimum difference value between adjacent other pieces of sensing data; (c) calculating difference values between the one or more pieces of temporary reference data; (d) calculating an N number of difference values between the N number of pieces of sensing data obtained from the nodes included in the Kth row and an N number of pieces of sensing data obtained from nodes included in the K-1th row; and (e) determining the temporary reference data having a relatively small representative value as reference sensing data of the Kth row.

Touch sensing apparatus and data processing method thereof

There are provided a touch sensing apparatus and method. The touch sensing apparatus includes a sensing circuit unit detecting a plurality of signals from a plurality of changes in capacitance generated in a plurality of electrodes provided in a panel unit; and a signal processing unit comparing, with predetermined reference levels, levels of at least two signals generated from changes in capacitance in at least two electrodes spaced apart from one another by a predetermined distance or greater, from among the plurality of electrodes, wherein, when the levels of the at least two signals are greater than the predetermined reference levels, the plurality of changes in capacitance are determined to be generated due to noise.

Touch sensing apparatus and method thereof

There are provided a touch sensing device and a method thereof. The touch sensing device, including: a plurality of sensing circuit units measuring capacitance variations from a plurality of sensing electrodes; at least one TDC circuit connected with the plurality of sensing circuit units to convert the capacitance variations into digital signals; a calculating unit judging a touch from the digital signals; and a delay circuit sequentially receiving the capacitance variations from the plurality of sensing circuit units.

Touch sensing device and method thereof

A sampling frequency offset estimation apparatus of an orthogonal frequency division multiplexing (OFDM) system includes a first differential operation unit performing complex conjugate multiplication of scattered pilots of complex symbols subjected to a fast Fourier transform (FFT) in an OFDM receiver, an interpolation unit repeating an operation of obtaining a median complex symbol between two consecutive symbols among complex symbols having first phase difference information from the first differential operation unit by a predetermined number, a second differential operation unit performing complex conjugate multiplication of two consecutive median complex symbols among median complex symbols from the interpolation unit, and a sampling frequency offset estimation unit estimating sampling frequency offset using complex symbols having second phase difference information from the second differential operation unit.

Sampling frequency offset estimation apparatus and method of OFDM system

Provided is an apparatus for estimating a delay spread of a multi-path fading channel in an Orthogonal Frequency Division Multiplexing (OFDM) system. The apparatus is applied to an OFDM receiver including a channel equalization unit compensating channel distortion by estimating channel distortion at pilot locations with respect to output signals of an FFT unit.

Apparatus and method for estimating delay spread of multi-path fading channel in OFDM system

An orthogonal frequency division multiplexing (OFDM) receiver capable of improving equalization performance is provided. In the OFDM receiver receiving an OFDM signal having a frame structure constructed with one reference symbol and a plurality of data symbols following the reference symbol, the OFDM receiver includes: a synchronizer which detects a position of the reference symbol from the received OFDM signal; a time-domain equalizer which equalizes in a time domain the data symbols that are separated by a distance longer than a predetermined distance from the position of the reference symbol; an FFT (fast Fourier transform) unit which performs an FFT process on the OFDM signal; and a frequency-domain equalizer which equalizes in a frequency domain the data symbols that are separated by a distance shorter than a predetermined distance from the position of the reference symbol.

OFDM receiver using time-domain and frequency-domain equalizing and time domain equalizer

The present invention relates to a method of estimating symbol synchronization for an Offset Quadrature Phase Shift Keying (OQPSK) demodulator applicable to a Zigbee receiver. More particularly, the invention relates to a method of recovering symbol synchronization of an OQPSK demodulator in which a reference correlation value is reset using a correlation value of a reception signal when detecting symbol synchronization in the OQPSK demodulator, preventing errors in detecting symbol synchronization due to noise, thereby increasing the accuracy in symbol synchronization.

Method of estimating symbol synchronization in OQPSK demodulator

Disclosed is a MEMS (Micro Electro Mechanical System) variable optical attenuator. The MEMS variable optical attenuator comprises a substrate having a flat upper surface; an electrostatic attenuator disposed on the upper surface of the substrate; transmitting and receiving terminals disposed on the substrate so that optical axes of the terminals coincide with each other; and a beam shutter moved to a designated position between the transmitting and receiving terminals by the actuator, wherein the beam shutter is provided with a first coating layer made of a material with a reflectivity of more than 90% and formed on a surface of the beam shutter, and a second coating layer made of a material with a reflectivity of less than 80% so that a part of light is transmitted by the second coating layer and with a photodisintegration rate of the transmitted light determined by a thickness of the second coating layer.

MEMS variable optical attenuator

Disclosed is a path-converted variable optical attenuator comprising: a transmitting fiber for launching an optical signal through a transmitting core; a receiving fiber for receiving the optical signal from the transmitting fiber through a receiving core; and a mirror having a reflector for obstructing the optical signal launched from the transmitting core of the transmitting fiber from proceeding into the receiving core of the receiving fiber, and being displaced in a direction allowing a portion of the optical signal of the transmitting fiber into the receiving fiber to attenuate the optical signal. An optical signal launched from the transmitting fiber to the receiving fiber is reflected to a separate path from paths of transmitting/receiving fibers so that attenuation may not vary according to wavelength.

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Suwon, South Korea

Hyun Suk Lee