To prevent the substrate floating effect that is caused when a transistor channel region fabricated of a monocrystal silicon layer covered with an insulator is in a floating state, and to stabilize the electrical characteristics of the transistor. The digital signal has a pattern in which a norm of an ideal transmitted sequence of symbols for zero is equal to a norm of an ideal transmitted sequence of symbols for one. The first green pixel cell detects first green light of a first wavelength region. The second fitting has a second configuration that differs from the first. This process further provides resilience by allowing a plurality of active gateways to substitute for a non-functioning gateway. The retaining mount thereof has an arc top surface to sustain the base of the blind embodiment in abutting location, a through hole to securely fix the retaining mount onto the top of the doorwindow frame thereby, and a coupling groove for protruded parts of the support boards to be inserted thereto for location thereby.