| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a highly reliable surface light emitting device which keeps a temperature distribution uniform and obtains a desired brightness with a necessary minimum number of solid light emitting elements. <P>SOLUTION: The surface light emitting device includes a flat substrate, a plurality of solid light emitting elements distributed on the substrate, and a control circuit which controls the magnitude of current supplied to the solid light emitting elements. The substrate has a plurality of areas having solid light emitting elements distribution densities different from each other. The control circuit carries out control so that each solid light emitting element in a low distribution density area is supplied with a current larger than a current supplied to each solid light emitting element in a high distribution density area. <P>COPYRIGHT: (C)2011,JPO&INPIT |
