Abstract: A new display panel system includes a stacked display panel and drive units therefor. The drive units include a computer for adjusting for the individual gamma characterics of each one of the display panels for color balancing purposes and for causing the luminance of each panel to be maximized, or at least greatly increased for each intensity level or shading of each color.

Abstract: Main power (e.g. an alternating voltage) is applied to a data processing system through a switch in a first state of the switch operation. The switch may have an arm movable to a first terminal to obtain the first state of switch operation and to a second terminal to obtain a second state of switch operation. A microprocessor periodically checks to determine if the main power to the data processing system has been interrupted. Upon such an interruption, the microprocessor produces a signal which causes the switch to be transferred to the second state of operation. The microprocessor is also operative to cause an alternating voltage to be produced during the interruption in the application of the main power to the data processing system. This alternating voltage is introduced to the data processing system in the second state of operation of the switch to energize the data processing system.