6 is constructed together with the pixels matrix 111 and shift register 7 using polycrystalline si tfts the present invention is not limited to such construction in the alternative the peripheral circuits to the pixels such as the analog signal drive circuit 6 may be embodied in monocrystalline lsis and mounted on the substrate even in the monocrystalline lsi embodiment of the analog signal drive circuit 6 it is not necessary to construct separate analog signal drive circuits 6 for r g and b pixels and this is obviously beneficial in view of the cost of packaging although the light emission characteristics of the r g and b organic el elements 23 as explained in referenced to fig3 change if the material of the organic el elements changes it should be appreciated that application of the present invention is not restricted to specific material of the organic el elements while the microprocessor 104 converts 6 bit digital pixel data into 8 bit data in preferred embodiment 7 it will be appreciated that the present invention is applicable regardless of the number of bits of the digital pixel data before and after conversion the foregoing invention has been described in terms of preferred embodiments however those skilled in the art.