A window sampling system and method are provided for comparing a signal with an unknown frequency to a reference clock. Chemical moieties can be attached to the membrane, and these moieties can be selected such that they have an affinity for molecules of interest, especially biological molecules of interest. The front board is disposed at a side of the bottom board. The result is much lower overall clock driver current draw, less heat, less dark current and less haze. In addition, the liquid crystal display panel further comprises a protection layer. The method includes the steps of determining binocular rivalry rate in the test subject and comparing the binocular rivalry rate with a corresponding reference rivalry rate to diagnose presence or absence of the mood disorder or predisposition therefor.