Sharp Kabushiki Kaisha Corporation

Mutsumi Hamaguchi

Masayuki Miyamoto

Shinji Shinjo

Hiroshi Kuhara

Kunihiko Iizuka

Masafumi Yamanoue

Narakazu Shimomura

Shinji Amano

Tsuyoshi Itaya

Tamiyo Nakabayashi

Eiji Nakaue

Shohji Sakurai

Mitsuru Tamata

The present disclosure detects capacitance distribution between each of detection electrodes and a detected subject on a touch panel with a simple configuration. A drive sense switch element selected among a plurality of drive sense switch elements (DST) on the basis of a code sequence via control lines turns on, and drive sense lines are driven at a first potential. A difference between linear sum signals based on an electric charge of each of the detection electrodes is then read. Subsequently, a capacitance or a change in capacitance between each of the detection electrodes of a touch panel and a detected subject is detected on the basis of a sum-of-product computation performed on the difference between the linear sum signals and the code sequence.

Capacitance detection method, position detection method, touch panel controller, and electronic device

Sense lines in a self-capacitance touch panel are multiplexed. A touch panel controller () includes a drive circuit () that drives drive lines (Dthrough D(K&#x2212;1)), based on a drive code series, a code multiplication unit () that reads multiple linear sum signals along the sense lines (Sthrough S(M&#x2212;1)), based on the charges of detection electrodes (E) and performs an inner product computation with a detection code series, and a detection circuit () that detects a capacitance or a change in the capacitance.

Touch panel controller, electronic apparatus, capacitance detection method, and position detection method

Capacitance distribution between each of detection electrodes and a stylus pen on a touch panel is detected with a simple configuration. A read step and a detection step are included. In the read step, a switch element selected among a plurality of drive sense switch elements (DST) between detection electrodes (E) and drive sense lines (DS) aligned in an X-axis direction based on a code sequence via control lines (DSS) aligned in a Y-axis direction is made to turn on, and a linear sum signal is read from each of the detection electrodes (E). In the detection step, a capacitance is detected.

To acquire touch position data with a good SN ratio without affecting a display action of a display element, a touch panel includes a non-drive region and a drive region. The non-drive region moves so as to correspond to one of a plurality of scanning signal lines selected and driven in order in a display period included in each frame of a display element. The drive region represents a region except for the non-drive region. A touch panel controller drives a signal line corresponding to the drive region and stops driving a signal line corresponding to the non-drive region.

Display module, touch panel controller, and electronic device

Capacitance distribution on a touch panel is detected with a simple configuration. A drive switch element between each of electrodes and a corresponding drive line is made to turn on and the drive line is driven on the basis of a code sequence. A sense switch element between each of the electrodes and a corresponding sense line is made to turn on and a linear sum signal of each of the electrodes is read along the sense line.

For detecting a signal based on driving of a pen point of a stylus pen satisfactorily, a stylus pen () includes a changeover switch () having a grip portion terminal () of a grip portion (), a pen point terminal () of a pen point (), and a ground terminal () of a ground, the changeover switch () switching connection of the grip portion terminal () to either the pen point terminal () or the ground terminal ().

Touch panel system and electronic device

The present invention provides a touch panel controller for controlling even a large touch panel with little EMI. The touch panel controller of the present invention includes a plurality of driving circuits (DCthrough DCm) for driving respective drive lines (DLthrough DLm) of a capacitive touch panel unitby supplying driving signals (Ds) to the respective drive lines (DLthrough DLm), and a rise/fall time of each of the driving signals (Ds) is variable.

Touch panel controller, touch panel device, and electronic information device

A stylus pen () includes a correction circuit that corrects difference between the number of controller clocks generated by a touch panel controller (), which controls operation of a touch panel (), for outputting a synchronization signal by the touch panel controller () and the number of pen clocks generated by the stylus pen () for receiving, by the stylus pen (), the synchronization signal output from the touch panel controller ().

Stylus pen, touch panel system and electronic device

A touch panel system () according to one aspect of the invention includes: a stylus pen () including a drive circuit () that generates a first driving voltage based on a first code sequence and a second driving voltage based on a second code sequence, and a sensor circuit () that drives a pen point () with a multiplexed voltage obtained by multiplexing the first driving voltage and the second driving voltage; and a touch panel controller () that detects a position of the stylus pen () touching a touch panel.

Touch panel system, stylus pen, and electronic device

Realized is an electrostatic capacitance value distribution detecting device capable of determining whether or not external noise exists. An electrostatic capacitance value distribution detecting circuit () of an aspect of the present invention drives vertical signal lines (VL) to output, from horizontal signal lines (HL), electric charges corresponding to electrostatic capacitances, and then drives the horizontal signal lines to output, from the vertical signal lines, electric charges corresponding to the electrostatic capacitances. The electrostatic capacitance value distribution detecting device includes a noise detecting section () which determines whether or not external noise exists.

Touch panel system, and capacitance value distribution detecting device having noise determining section

A signal processing system () includes a switching circuits () which switches between subsystems (), on a basis of a frequency of noise mixed in each of time-series signals, the amount of that noise, and input-output transfer characteristics, to reduce noise present in a result of estimation of the value of a linear element (CX), which estimation is performed by addition- and subtraction-based signal processing.

Signal processing system, touch panel controller, touch panel system using same, and electronic device

A touch panel controller (), which can accurately detect changes in capacitance values of respective first and second electrostatic capacitors which are touched, includes: a driving section () for driving drive lines (DLthrough DL) on the basis of a code sequence so as to drive (i) electrostatic capacitors (Cthrough C) provided between the respective drive lines (DLthrough DL) and a sense line (SL) and (ii) electrostatic capacitors (Cthrough C) provided between the respective drive lines (DLthrough DL) and a sense line (SL) so that (i) a first linear sum of first capacitance values of the respective electrostatic capacitors (Cthrough C) is outputted from the sense line (SL) and (ii) a second linear sum of second capacitance values of the respective electrostatic capacitors (Cthrough C) is outputted from the sense line (SL); a differential amplifier () for amplifying a difference between the first linear sum and the second linear sum; and a saturation prevention control section () for correcting a line dependency between the first capacitance values and the second capacitance values.

Touch panel controller and electronic apparatus employing same

A front-end circuit according to the present invention includes a VCO which oscillates a local signal, a mixer which converts an RF signal Frf into a baseband signal, a DC offset cancel circuit which detects a DC offset contained in the baseband signal and then eliminates the DC offset, and a local frequency control circuit which controls a frequency of the local signal. In a case where the RF signal is an analog television signal, the local frequency control circuit controls the frequency of the local signal so that a frequency of the baseband signal differs from each frequency spectrum of a luminance signal contained in a video signal which is generated by demodulating the baseband signal. This makes it possible to provide the front-end circuit which can prevent video distortion caused when a frequency spectrum is eliminated from the luminance signal.

Front-end circuit, tuner, and television broadcasting receiver

A cascode-connected amplifier circuit including two transistors cascode-connected to each other, where a first transistor having a grounded emitter or a first field-effect transistor having a grounded source, and (a) a second transistor, having a grounded base, which is cascode-connected to the first transistor or to the first field-effect transistor, or (b) a second field-effect transistor, having a grounded gate, which is cascode-connected to the first transistor or to the first field-effect transistor. The cascode-connected amplifier circuit includes a switching element causing a collector of the first transistor or a drain of the first field-effect transistor to be grounded.

Cascode-connected amplifier circuit, semiconductor integrated circuit using same, and receiving apparatus using same

An inductor of the present invention includes a plurality of insulating layers being stacked and coil patterns respectively provided on predetermined layers of the insulating layers. The coil patterns are provided on at least two of the insulating layers, and electrically connected to each other. With this arrangement, it is possible to improve Q of the inductor without increasing the size of the inductor.

Growing community of inventors

Osaka, Japan

Mutsumi Hamaguchi