A light source using electroluminescence layers of which width and thickness
are
adjusted so that emission luminance does not depend on the position on the layer.
Also, a light source using red, green and blue electroluminescences light media
for a color source of which the width and thickness are so adjusted that the required
emission luminance can be obtained from electroluminescences for the respective
colors. In light sources using electroluminescence not adjusted in width and thickness
as light medium, emission luminance is different from position to position, especially
in the direction along the longitudinal direction.
