Abstract: The invention provides a multi-layer printed circuit board with a through hole having a connection formed by filling conductive paste in the through hole, wherein the voltage of a circuit having constant current flow is stabilized. The circuit board comprises a closed circuit that starts from a power supply terminal and passes a power supply line, a connection connecting the patterns on the front and rear surfaces of the board, a load and a ground line to reach an earth terminal, wherein if the voltage drop at the connection exceeds a value determined based on a predetermined rate with respect to the power supply voltage, all or some of the connections is replaced with a jumper wire so that the voltage drop at the connection is equal to or smaller than a value determined by said predetermined rate, according to which the voltage level of the power supply line and the ground line is stabilized.

Abstract: An object of the invention is to provide a display unit capable of rendering an uneven luminance undistinguished by processing a display area alone where a burning phenomenon occurred without processing an entire screen. A main unit CPU of an image display unit is provided with an image signal control part for controlling luminance level of a display screen based on set date relating to light emission luminance which is set in a RAM, a processing area specifying part for specifying a burning moderate area and a timer setting part for controlling processing time. The processing area specifying part specifies a processing area in accordance with the operation of the remote controller so as to surround an area where the burning phenomenon occurred. The image signal control part allows the fluorescent material to emit light at a luminance level which is set to be continuously lowered toward the peripheral portion of the processing area. Upper limit of light emission time is defined by the timer setting part.