Abstract: A solar cell module includes a plurality of electric power generation units. Each of the plurality of electric power generation units includes a solar cell element and a light guide unit having a first surface and a second surface positioned opposite to the first surface and configured to guide light toward the solar cell element between the first surface and the second surface.

Abstract: A solar cell module includes a plurality of electric power generation units. Each of the plurality of electric power generation units includes a solar cell element and a light guide unit having a first surface and a second surface positioned opposite to the first surface and configured to guide light toward the solar cell element between the first surface and the second surface.

Abstract: A plate member of the present invention has an entrance surface (1); an end surface (2) from which a part of entered light, which has entered the entrance surface (1) and has been guided to the end surface (2), exits; and an exit surface (3) from which at least part of rest of the entered light exits. The plate member includes a fluorescent concentrating plate (10) containing fluorescent molecules and a dielectric multilayer mirror (11). The dielectric multilayer mirror (11) (i) reflects light having a complementary color of a color of light generated by the fluorescent molecules or (ii) causes light having the complementary color to pass through. The plate member is configured by stacking the fluorescent concentrating plate (10) and the dielectric multilayer mirror (11).

Abstract: A solar cell unit (100) of the present invention includes (i) a fluorescence converging plate (2) that contains fluorescent materials (6) for absorbing invisible light and then emitting invisible light and (ii) a solar cell (4) provided on an end surface (2a) of the fluorescence converging plate (2) so as to have a light receiving surface which faces the ends surface (2a). When the fluorescence converging plate (2) is irradiated with external light, the fluorescent materials (6) emit invisible light which is then reflected in the fluorescence converging plate (2) and thereafter converged onto the end surface (2a). The solar cell (4) carries out electric power generation by use of fluorescence converged onto the end surface (2a) of the fluorescence converging plate (2). Conversely, visible light, with which the fluorescence converging plate (2) is irradiated, is transmitted through the fluorescence converging plate (2) without being absorbed by the fluorescent materials (6).

Abstract: An illuminator according to the present invention includes a backlight (110) for emitting light containing first and second polarization components having polarization directions which are orthogonal to each other; and a selective reflection polarizer (120) having a reflectance for the first polarization component which is higher than a transmittance for the first polarization component, and having a transmittance for the second polarization component which is higher than a reflectance for the second polarization component. The selective reflection polarizer (120) includes a transparent substrate (122) and a plurality of metal wires (124) arrayed on the transparent substrate (122). The ratio of a width of the metal wires (124) to a pitch of the metal wires (124) is greater than 30% and equal to or less than 42%, and the backlight (110) has a reflectance of 0.6 or more.

Abstract: A display device (1) includes: a PDLC panel (5), which covers a display surface formed by a display part (2a) and a peripheral section (4a), and which, while directly transmitting incident light when a voltage is applied, scatters incident light when no voltage is applied; and a voltage application control circuit (31), which carries out such control that when a display is carried out on the display surface, a voltage is applied from a power supply (v1) to the PDLC panel (5), and when no display is carried out on the display surface, the voltage is not applied from the power supply (V1) to the PDLC panel (5).

Abstract: An illuminator according to the present invention includes a backlight (110) for emitting light containing first and second polarization components having polarization directions which are orthogonal to each other; and a selective reflection polarizer (120) having a reflectance for the first polarization component which is higher than a transmittance for the first polarization component, and having a transmittance for the second polarization component which is higher than a reflectance for the second polarization component. The selective reflection polarizer (120) includes a transparent substrate (122) and a plurality of metal wires (124) arrayed on the transparent substrate (122). The ratio of a width of the metal wires (124) to a pitch of the metal wires (124) is greater than 30% and equal to or less than 42%, and the backlight (110) has a reflectance of 0.6 or more.