Abstract: A technique for an information display apparatus technique with improved display characteristics is disclosed. An image, which is displayed at a low resolution by light emitting diodes in a light emitting display panel, is modulated by light modulating devices arranged at a higher resolution than the light emitting diodes in a light modulating panel, which overlaps a front surface of the light emitting display panel, so that a display of a high resolution image is achieved. Adjustment of non-uniformity of characteristics of the light emitting diodes may be achieved by adjusting the light emission of the light emitting diodes on one hand and may be further achieved by adjusting modulation parameters of the light modulating devices additionally. A light emitting display panel may further include a plurality of light detecting devices each of which is adjacently arranged to a corresponding light emitting diode.