A front light and a reflective display using the same are provided. The resonant properties of the cavity are therefore completely insensitive to variations in the volume of the pressure chamber. Instead of one printed circuit board, the transformer may be embodied in two printed circuit boards as well, each comprising a magnetic layer and a transformer coil. Further, gate conductor spacers may be formed by anisotropic etching of the grown film. During the phase capture mode, the analog PLL control signal and the digital PLL control signal may be given a percentage of control over the output oscillator depending on the state of lock of the analog PLL andor the digital PLL. In an embodiment, system information and a system information identifier are stored by the communication device in a first connection state and the system information identifier is transmitted to the network communication device after changing to a second connection state.