Projecting sections controlling alignment directions of liquid crystal molecules are provided on at least one of an active matrix substrate and a counter substrate. At the first end point of the transmission line the digital optical signal to be transmitted to the second end point is amplitude-modulated with a preset frequency, with the modulation amplitude being small relative to the amplitude of the digital signal. The programmable electronic circuitry includes one or more of programmable interconnects, pass devices, look-up table circuits, andor multi-input logic circuits.