Provided are a method, a base station and a computer storage medium for implementing inner loop and closed loop power control. Main power supply lines are arranged along one side of a rectangular region including a MOS logic circuit whose subthreshold current must be reduced, and a plurality of sub-power supply lines are arranged on the region in the direction perpendicular to the main power supply lines. Here, the period includes a 1st time-period during which an electric current having a 1st intensity is fed to the light-source, and a 2nd time-period during which an electric current having a 2nd intensity differing from the 1st intensity is fed to the light-source. Accordingly, the registration of a group mode can be simplified. By allowing the simultaneous transmission of multiple signals on the same frequencies and over the same channel space, such a transmitter may increase the effective bandwidth of the channel space, and thus may allow more devices to simultaneously share the same channel space. The blank layout efficiency of reflective polarizers can be increased though the distinct vision direction B is slightly deviated from the direction of the visual angle at a six o’clock hour, and the manufacturing cost can be reduced, accordingly.