Cypress Semiconductor Corporation

Vadym Grygorenko

Viktor Kremin

Oleksandr Pirogov

Jens Weber

Andriy Maharyta

Taras Kuzo

Pavlo Saldak

Oleksii Bukhtii

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

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

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

A method, apparatus, and system to detect whether a two-electrode touch button is pressed using a first self-capacitance measurement of an inner electrode of the two-electrode touch button and a second self-capacitance measurement of an outer electrode of the two-electrode touch button. The method, apparatus, and system further to detect whether the two-electrode touch button is pressed in view of presence of water proximate to the touch button.

Two-electrode touch button with a multi-phase capacitance measurement process

A method of estimating multiple touch positions on a touch sensor array, based on centroids calculated in the vicinity of a local maxima determined for the touch sensor array.

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Lviv, Ukraine

Vadym Grygorenko