Abstract: A large number of display components are arranged and fixed, for example, in a matrix configuration on a first principal surface of a large optical guide plate to construct a main display device body. A substance having a light-transmitting property adjusted for its refractive index is allowed to intervene at least between the large optical guide plate and the display components. The refractive index of the substance is preferably similar to the refractive index of the large optical guide plate as closely as possible. As for the light-transmitting property of the substrate, it is preferable that the transmittance is not less than 50% for the perpendicular incident light at the wavelength in the visible light region, and it is more preferable that the transmittance is not less than 70%, in order to successfully introduce the light into the display component in an efficient manner and suppress the electric power consumption.

Abstract: A display device comprises a main display device body incorporated into a frame constructed by assembling transparent plate members. Specifically, a plurality of display blocks are arranged in a matrix configuration in an opening of the frame. Further, a substance having a light-transmitting property adjusted for its refractive index, for example, a flexible type adhesive made of an acrylic material is allowed to intervene at end surface portions of the respective display blocks and between the display blocks and the inner wall of the frame.

Abstract: A light absorbing member is disposed on the periphery of a display element, a light absorbing layer is applied to an area that appears as a bright defect, and a projection is disposed on a surface of an optical waveguide panel of the display element which confronts a large-size light guide panel. If the projection comprises at least three projections, then the projections should preferably be disposed in respective positions spaced from the closest side of the display element by a distance of at most L/3 where L represents the length of a longer side of the display element.

Abstract: A large number of display components are arranged and fixed, for example, in a matrix configuration on a first principal surface of a large optical guide plate to construct a main display device body. A substance having a light-transmitting property adjusted for its refractive index is allowed to intervene at least between the large optical guide plate and the display components. The refractive index of the substance is preferably similar to the refractive index of the large optical guide plate as closely as possible. As for the light-transmitting property of the substrate, it is preferable that the transmittance is not less than 50% for the perpendicular incident light at the wavelength in the visible light region, and it is more preferable that the transmittance is not less than 70%, in order to successfully introduce the light into the display component and suppress the electric power consumption.