To enable visualization of images having no color slippage and a good shade by compensating the radiation intensity of a LED lamp, so as to make the radiation intensity in a prescribed range to be matched with each other an improve the color balance.

An analog image signal is converted into a digital signal by an AD converter 3, and a compensating coefficient signal corresponding to the address of a blue LED chip of each pixel is outputted by a compensating coefficient circuit 4. After a data signal from the AD converter 3 has been compensated in accordance with the compensating coefficient signal in a compensating circuit 5, an address signal from the AD con-verter 3 and data, in which the pulse width of a lighting pulse is compensated so as to widen the width by the compensat-ing circuit 5, are sent to a lighting controller. Consequently, a blue LED chip is turned on with a radiation intensity higher than that of other red and green LED chips. The table of compensating coefficients, which increase in the order of a LED lamp of a small address located on the lower side to lamps of large address located on the upper side, is used.