A device includes a force driver applying a force signal to a force node associated with a mutual capacitance between the force node and a sense node. A sensing circuit receives a sense signal from the sense node associated with the mutual capacitance between the force node and the sense node, and generates an output indicative of the sensed mutual capacitance. A control circuit controls the generation of the force signal to alternate between at least two different frequencies by generating consecutive pulses, with a given pulse of the consecutive pulses at a first of the at least two different frequencies. In a first operating state, a next pulse immediately succeeding the given pulse is at a second of the at least two different frequencies, and in a second operating state the next pulse immediately succeeding the given pulse is at the first of the at least two different frequencies.

The present embodiment may provide a touch sensing circuit including: an analog signal processing circuit including one or more adjustable filters configured to receive a touch sensing signal from a touch electrode of a panel and to transmit some of a frequency region of the touch sensing signal; and a touch control circuit configured to determine a change in capacitance of the touch electrode attributable to an object approaching the panel and to transmit a controlling signal to control the adjustable filters of the analog signal processing circuit. The adjustable filter of the present embodiment may include a variable resistor or a variable capacitor. A resistance value or capacitance value of the adjustable filter may be changed in response to the controlling signal, thus changing a frequency pass band of the touch sensing signal.

A touch panel includes arranged touch electrodes, and a driver IC connected to each of the touch electrodes. The plurality of touch electrodes is grouped into a plurality of groups such that electrodes belonging to different groups are included in a range smaller than an object to be detected, such as a finger. The driver IC alternately or sequentially applies a driving voltage to the touch electrodes of the plurality of groups, detects a capacitance of each of the sensor electrodes, and detects, based on the detected capacitance, whether there is a touch.

A detecting device includes a plurality of first electrodes extending in a first direction and a plurality of second electrodes extending in a second direction intersecting the first direction, the first electrodes and the second electrodes being disposed facing each other with an insulating layer interposed therebetween, a first electrode selection circuit configured to supply a drive signal to the first electrodes, and a detection circuit configured to detect capacitance generated between the first electrodes and the second electrodes due to the drive signal.

The present disclosure relates to a touch circuit and a touch sensing method. A touch circuit may include a driving circuit configured to transmit a driving signal to a touch electrode, a sensing circuit configured to sense a change in capacitance generated in the touch electrode, and a touch control circuit configured to control a polarity of the driving signal transmitted by the driving circuit. The polarity of the driving signal controlled by the touch control circuit may be determined based on a location of the touch electrode. Touch sensitivity can be improved by differently controlling a polarity of a driving signal transmitted to an adjacent touch electrode.

A circuit board includes multiple of first touch sensing electrodes, multiple of second touch sensing electrodes, and multiple of dummy patterns. The first touch sensing electrodes extend along a first direction. The second touch sensing electrodes extend along a second direction. The first touch sensing electrodes are electrically insulated from the second touch sensing electrodes. The first direction is not parallel to the second direction. The dummy patterns are positioned on the areas between the first touch sensing electrodes and the second touch sensing electrodes. The first touch sensing electrodes, the second touch sensing electrodes, and the dummy electrodes are non-transparent.

An electronic device, including: a display panel, including a fingerprint recognition region, the fingerprint recognition region including a central region and an edge region surrounding the central region; an optical sensor, configured to collect a fingerprint image of a target object and including a plurality of photosensitive units, wherein a projection of the optical sensor on the display panel along a direction perpendicular to the display panel is within the fingerprint recognition region; and a controller, configured to control photosensitive performance of at least one photosensitive unit corresponding to the edge region to be better than photosensitive performance of at least one photosensitive unit corresponding to the central region.

A touch screen system includes two rectangular matrix touch panels, broken down into cells and disposed side by side forming a border between the two touch panels, each touch panel being connected to a respective touch screen board, and a data communication link between the boards, the two boards and respectively the two touch panels being configured as a master/slave configuration and to exchange respective data.

A touch screen controller, a touch screen driving circuit and a touch screen system are provided. The touch screen driving circuit configured to drive a touch screen includes an analog driving circuit configured to provide driving signals to a display panel and a touch panel of the touch screen, and generate a touch sensing value based on a touch sensing signal from the touch panel; a display noise table (DNT) comprising display noise information indicating display noise that varies according to a driving state of the touch screen and image data; a feature extractor configured to extract a plurality of feature values from the driving state and the image data; and a touch processor configured to read a display noise value mapped to the plurality of feature values from the DNT, subtract the display noise value from the touch sensing value and generate a touch value.

A display device including a display panel including pixels that emit light on a frame basis. An input sensing unit includes driving electrodes and sensing electrodes. A driving signal generator is configured to provide driving signals to the driving electrodes. Analog front-ends are configured to receive sensing signals depending on the driving signals from the sensing electrodes. A signal processor is configured to detect touch input, based on differential output values of the analog front-ends. The driving signal generator provides the driving signals to the driving electrodes while avoiding a period in which a pulse of a vertical synchronization signal defining start of the frame is generated.