Embodiments of methods and apparatus for optimization of verification of a chip design are disclosed. A method for creating and controlling a location of a virtual microphone near a telecommunication device so as to reduce background noise in a speech signal is also disclosed. The light shielding film has an end fixedly connected to an upper surface of the light guide plate and an opposite end fixedly connected to the backplane. Thereby the ends of the bending beam are connected with ring elements which are oriented perpendicularly to the longitudinal axis, and which are welded with the pipe sleeve at their radial edge area.