PRISMATIC TYPE SEALED BATTERY

An image display has a light guide having a total reflecting surface which reflects guided light for image display totally transmits the light and an optical switch having a microprism which extracts the evanescent light leaking from the total reflecting surface and reflects it. Guided light is directed from two directions symmetrical with respect to a display area to produce light from the whole surface of the microprism. Therefore, an image display on which a brighter image having a higher contrast can be displayed is provided, by optimizing the vertex angle of the microprism, the directions of emitted rays of light are matched and directed vertically to the total reflecting surface, so that an image display which displays a high quality image is realized.