A GaP monolithic numeric display with internal reflection facets

High brightness monolithic displays of GaP LED´s with slanting back surface facets which serve as self-reflection mirrors have been fabricated. A major fraction of radiation from the junction is so efficiently reflected by the slanting sides of the mesa-shaped segments that the out-coming beams can be confined into narrow regions. In fabrications of the devices, the wire-bonding process has been eliminated in such a way that the electrode contact to the n-region is also led from the same surface of the wafer as the p-contacts through an intentionally shorted p-n junction. Consequently, there is no electrode area which may shade the radiation on the light emitting surface. The structure gives an improvement in optical isolation as well as in external intensity, resulting in well-defined display patterns with high brightness.