An automatic switching system and method for determining and effecting an optimal video display mode based on the interaction among participants in a conference or discussion is disclosed. Particularly, the pixel switch SW includes a source electrode and a drain electrode which is formed together with the anode on an interlayer insulating film so as to reflect the light laterally emitted from the self light-emitting layer. The device also includes a sealable opening within the tubular channel and an insertable orifice plug having a set diameter for insertion into the sealable opening in order to calibrate the protective mask tester. In one embodiment, the control circuit of the LED driver includes a frequency regulator to monitor the switching frequency and adjusts the hysteresis window accordingly to maintain a constant switching frequency. All data resident in the LUNs of the source array are copied to corresponding LUNs in the virtual array.