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.

An anti-ghosting keyboard includes a sensing unit, a detection unit, and a processing unit. The sensing unit includes a plurality of sensing modules, each of which includes N number of switches and N number of sensing resistors, where N is a positive integer greater than one. The detection unit includes a divider resistor that is connected in series with one of the sensing modules, and a detection module that is connected to a point of connection between the sensing unit and the divider resistor. The detection module obtains a divided voltage value across the divider resistor and generates a potential level value based on the divided voltage value. The processing unit is electrically connected to the detection module for receiving the potential level value therefrom, and generates a key-press signal that corresponds to the one of the sensing modules based on the potential level value thus received.

An anti-ghosting keyboard includes a sensing unit, a detection unit, and a processing unit. The sensing unit includes a plurality of sensing modules, each of which includes N number of switches and N number of sensing resistors, where N is a positive integer greater than one. The detection unit includes a divider resistor that is connected in series with one of the sensing modules, and a detection module that is connected to a point of connection between the sensing unit and the divider resistor. The detection module obtains a divided voltage value across the divider resistor and generates a potential level value based on the divided voltage value. The processing unit is electrically connected to the detection module for receiving the potential level value therefrom, and generates a key-press signal that corresponds to the one of the sensing modules based on the potential level value thus received.

An anti-ghosting membrane keyboard includes a bottom membrane layer, a sensing circuit, and a top membrane layer. The sensing circuit includes a first circuit disposed on the bottom membrane layer, a plurality of flexible conductive elements disposed on the first circuit and spaced apart from each other, and a second circuit disposed on the flexible conductive elements. Each of the flexible conductive elements is a force-sensing resistor. The first circuit and the second circuit are spaced apart by the flexible conductive elements, and each of the flexible conductive elements is connected between a portion of the first circuit and a portion of the second circuit. The top membrane layer is disposed over the bottom membrane layer and the sensing circuit, and is adhered to the bottom membrane layer to cooperatively enclose the sensing circuit.