Cypress Semiconductor Corporation

Jens Weber

Viktor Kremin

Oleksandr Pirogov

Andriy Yarosh

Vadym Grygorenko

Taras Kuzo

Daniel O'Keeffe

Brendan Lawton

Khosrov D Sadeghipour

Andrew Kinane

Yarsolav Lek

Gaurav Panchanan

Oleksandr Karpin

Igor Kolych

Oleksandr Hoshtanar

Igor Kravets

Oleksii Bukhtii

An apparatus and method for detecting the angle of passive rotary knob partially located on a touch screen are described. In embodiments the apparatus includes a touch screen having an array of sensors and a dial that includes a base and a knob attached to the base and rotatable relative to the base. The knob includes a plurality of conductive elements, each positioned a distance from a center point of the knob. A controller is also included, coupled to the touch screen, and configured to receive signals generated by one or more sensors of the array in response to the sensors detecting one or more of the conductive elements. The controller can determine a rotational angle of the knob based on the signals generated by the one or more of the sensors in the array while a portion of the knob does not overlap the array of sensors.

Detecting the angle of passive rotary knob partially located on touch screen

Systems, methods, and devices detect defects in touch panels. Methods include scanning, using a designated integration window, a plurality of electrodes of a sensing device to obtain a plurality of measurements and determining a plurality of variance values for the plurality of electrodes based on the plurality of measurements, the plurality of variance values identifying variances in the plurality of measurements between adjacent sense locations of the sensing device. Methods also include determining if a defect is present in the sensing device based, at least in part, on a comparison of the plurality of difference values with the plurality of threshold values.

Systems, methods, and devices for defect detection in capacitive touch panels

Apparatuses and methods of quadrature modulation and compensation are described. One touch controller includes a receiver sensing channel to measure a sense signal and generate at least four samples per one period of the sense signal. The touch controller includes quadrature demodulation logic to determine phase information of the sense signal using the at least four samples per one period of the sense signal and processing logic to execute a compensation algorithm to compensate for a phase mismatch of the touch controller based on the phase information.

Quadrature calibration methods for sensor applications

Systems, methods, and devices improve the sensitivity of capacitive sensors. Devices may include an attenuator configured to receive an input from at least one sense electrode of a capacitive sensing device. The attenuator may be included in a sensing channel of a capacitive sensor. Devices may further include a signal generator coupled to an input of the attenuator. The signal generator may include one or more processors configured to generate a sinusoidal signal based, at least in part, on one or more noise characteristics of a scan sequence associated with one or more transmit electrodes of the capacitive sensing device, and provide the sinusoidal signal to the input of the attenuator.

Systems, methods, and devices for capacitive sensing with sinusodial demodulation

An apparatus includes a global baseliner circuit coupled with sensing channels of a sensing device. The global baseliner circuit has a signal generator to generate a rectified sinusoidal signal and a square wave having a frequency matching that of an excitation sinusoidal signal, and is to use the square wave to modulate the excitation sinusoidal signal provided at an output of the global baseliner circuit. A channel baseliner circuit is coupled between the global baseliner circuit and a sensing channel and that includes a switched capacitor coupled between the output of the global baseliner circuit and the sensing channel; a sigma-delta modulator coupled with the signal generator and to generate, from the rectified sinusoidal signal, a density-modulated bit stream; and a pair of AND gates to use the density-modulated bit stream and non-overlapping clock signals to generate outputs including density-modulated clock signals sent to switches of the switched capacitor.

Low-noise, high-resolution ratiometric capacitive baseliner

A touch screen display and corresponding devices and methods are disclosed, the touch screen display comprising a touchscreen having a plurality of capacitive sensors and a passive dial having one or more conductive elements, the passive dial mounted within an active area of the touchscreen such that the one or more conductive elements are proximate to the face of the touchscreen and move in conjunction with a rotation of the passive dial. The touch screen display may further include a touchscreen controller to detect an angle of the passive dial using conventional capacitive sensing techniques.

Detecting the angle of a touch screen mounted passive dial

Technology directed to low-emissions touch controller in in-cell touch display systems is described. One in-cell touch controller includes a signal generator circuit that is configured to generate a sense signal according to a sensing function, the sense signal including a windowed sinusoidal waveform. The controller generates a transition signal to transition the in-cell touch display between a display function and the sensing function. The controller drives the sense signal and the transition signal on common voltage (VCOM) layer of electrodes during a touch scanning interval. During a display function interval an integrated display driver is configured to drive a first signal on the VCOM layer of electrodes during a display function interval.

Low-emissions touch controller

Systems, methods, and devices for capacitive sensing with sinusoidal demodulation

Systems and methods access a correction value in a correction matrix. The correction matrix defines an active region of a touch array that includes plurality of unit cells. The correction value corresponds to a unit cell of the plurality of unit cells. Systems and methods modify a touch sense value of the unit cell using the correction value, based on the unit cell being partially within the active region. Systems and methods detect an object using the touch array, based on the modified sense value.

Uniformity correction method for low cost and non-rectangular touch sensor matrices

An apparatus including a first signal generator of a force sensing circuit to output a first excitation (TX) signal on a first terminal and a second TX signal on a second terminal. The first terminal and the second terminal are configured to couple to a first force sensor and a reference sensor. The apparatus includes a first receiver channel coupled to a third terminal and a fourth terminal. The third terminal is configured to couple to the first force sensor and the fourth terminal is configured to couple to the reference sensor. The force sensing circuit is configured to measure a first receive (RX) signal from the first force sensor via the third terminal and a second RX signal from the reference sensor via the fourth terminal. The force sensing circuit is configured to measure a force value indicative of a force applied to the first force sensor.

Force sensing

A method includes storing a set of touch sense values corresponding to a measured characteristic of at least one unit cell of a plurality of unit cells of the touch array and accessing a correction matrix that defines an active region and an inactive region of the touch array. The inactive region is surrounded by the active region. The method further includes modifying touch sense values of a first subset of the plurality of unit cells that are partially within the active region defined by correction values of the correction matrix.

A correction matrix for use with non-rectangular touch arrays is described. In one embodiment, a sensing device may include a memory and a processing element coupled to the memory. The memory may store a set of touch sense values corresponding to a measured characteristic of at least one unit cell of plurality of unit cells of a non-rectangular touch array and may store a correction matrix. The correction matrix may define an active region and an inactive region of the non-rectangular touch array. The processing element may modify touch sense values of a subset of the plurality of unit cells that are not completely within the active region defined by correction values of the correction matrix.

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Munich, Germany

Jens Weber