An anti-ghost membrane switch device includes a first membrane layer, a second membrane layer, and a spacing layer. A first surface of the first membrane layer is provided with first trigger points and a first signal line. The first signal line is connected to the first trigger points and extends to a first output terminal. A second surface of the second membrane layer faces towards the first surface and is provided with second trigger points and second signal lines. Ends of the second signal lines are connected to the second trigger points. Another ends of the second signal lines extend to the second output terminal. The second signal lines are not electrically connected with one another. The first signal line of the first membrane layer and the second signal lines are not electrically connected with one another. The spacing layer is between the first and second membrane layers.

A ghost key preventing circuit includes plural driving lines, plural sensing lines, plural key switches, plural bias resistors and a controller. The plural driving lines and the plural sensing lines are collaboratively formed as a matrix circuit. The plural key switches are included in the matrix circuit. The plural bias resistors are connected with the corresponding sensing lines. When the key switch of a specified switch circuit is turned on, a divided voltage is generated and outputted from the specified switch circuit. The controller judges whether the key switch of the specified switch circuit is normally turned on or the key switch is a ghost key according to the divided voltage.

An apparatus includes a plurality of capacitive sensors arranged in a matrix on a substrate. A measuring circuitry measures the capacitance of each of a plurality of row lines and a plurality of column lines in the matrix coupled to the capacitive sensors. A first electrode is on the substrate on a first edge of the matrix and is proximal to a first corner of the matrix. The first electrode is coupled to the measuring circuitry. A second electrode is on the substrate on the first edge of the matrix and is proximal to a second corner of the matrix, the second corner opposing the first corner on the first edge. The second electrode is coupled to the measuring circuitry. The measuring circuitry determines the positions of two touches to the touch pad. Methods are disclosed.

A keyboard apparatus including a key module and a detection circuit is provided. The key module includes a plurality of keys, a plurality of scan lines and a plurality of return lines. The scan lines and the return lines are crossed to each other and respectively coupled to the keys. The detection circuit detects a plurality of return voltages of the return lines and generates a plurality of detection signals accordingly so as to indicate that a switch of each of the keys is at an on state or at an off state. The detection circuit includes a plurality of P-type transistors. A first terminal of each P-type transistor is coupled to a ground terminal, a control terminal of each P-type transistor is directly coupled to a corresponding one of the return lines, and a second terminal of each P-type transistor generates and outputs one of the detection signals.

A keyboard apparatus including a key module and a detection circuit is provided. The key module includes a plurality of keys, a plurality of scan lines, and a plurality of return lines. The scan lines and the return lines are crossed to each other and coupled to the keys respectively. The detection circuit is coupled to the return lines and configured to detect a current flowing through each of the return lines and indicate that a switch of each of the keys is in an on state or in an off state according to a value of the current.

A load control device may be used to control and deliver power to an electrical load. The load control device may comprise a control circuit for controlling the power delivered to the electrical load. The load control device may comprise multiple actuators, where each of the actuators is connected between a terminal of the control circuit and a current regulating device. The number of the actuators may be greater than the number of the terminals. The control circuit may measure signals at the terminals and determine a state configuration for the actuators based on the measured signals. The control circuit may compare the state configuration to a predetermined dataset to detect a ghosting condition.

Various implementations relate to keyboard data communicated from a client device to a remote access manager. For example, the remote access manager may receive the keyboard data via a communication channel. The keyboard data may include key down states. The remote access manager may insert a key up state after each key down state in the received keyboard data to generate modified keyboard data.

The invention relates in an aspect A to a method for determining active input elements (S1a, S2a) of an input arrangement (10), comprising providing input elements (S1a to S2b) that are connected according to a matrix arrangement, providing within the matrix arrangement at least two drive lines (L1, L2) that are each connected to a respective driving circuit (2, 4), providing within the matrix arrangement at least two sense lines (Ca, Cb) that may be used to detect active input elements (S1a, S2a), providing within the matrix arrangement serial connections (SC1 to SC4) each comprising one of the input elements (S1a) and a resistor (R1a) and each serial connection (SC1 to SC4) being connected to a respective one of the drive lines (L1, L2) and to a respective one of the sense lines (Ca, Cb), providing pull resistors (Ra, Rb) that connect the sense lines (Ca, Cb) to a first potential, and using a control device for the driving circuits that drives an active drive line (L1) to a second potential that is different from the first potential and that drives a non active drive line (L2) or non active drive lines to the first potential or to a potential having an absolute offset value from the first potential that is at most 50 percent or at most 10 percent of the absolute value of the difference of the first potential and of the second potential.

An apparatus includes a plurality of capacitive sensors arranged in a matrix on a substrate. A measuring circuitry measures the capacitance of each of a plurality of row lines and a plurality of column lines in the matrix coupled to the capacitive sensors. A first electrode is on the substrate on a first edge of the matrix and is proximal to a first corner of the matrix. The first electrode is coupled to the measuring circuitry. A second electrode is on the substrate on the first edge of the matrix and is proximal to a second corner of the matrix, the second corner opposing the first corner on the first edge. The second electrode is coupled to the measuring circuitry. The measuring circuitry determines the positions of two touches to the touch pad. Methods are disclosed.

A keyboard includes plural keys, a membrane key switch module and plural diodes. The plural diodes are disposed on the membrane key switch module, and electrically connected with plural upper contacts or plural lower contacts of the membrane key switch module. Consequently, the keyboard has the function of avoiding the ghosting problem.