A ground pattern 8 has a portion thereof removed in an area 13 where an inverted-F plate antenna 1 is mounted. The driving circuit portion is controlled by a system circuit block. The spacing distance between the first and second light-transmissive substrates 1, 2 is narrowed while allowing the first and second light-transmissive substrates 1, 2 to be opposed to one another, and a space between the both is filled with the adhesive. Thus, back-and-forth scanning and unidirectional scanning are used jointly in appropriate fashion in accordance with the printed image. The Tio2 film varies in thickness to produce multilevel color variations through the effect of light refraction.