A display drive circuit has a signal line drive circuit that, before the display panel is turned OFF, writes prescribed data signals to a respective plurality of pixels via a plurality of source signal lines, such that the potential of the drain electrodes of the respective pixels becomes equal to the potential of the opposite electrode after the display panel is turned OFF. The collar member includes first, second, third and fourth surfaces, a tapped opening on the first surface engaging the fastener, and a conduit between the second and third surfaces. The width between the reflection surface and the exit plane at the planes of incidence of the rod-like photoconductor is smaller than the width of the light sources in the same direction.