Title :
Enhancing the brightness of thin-film electroluminescent displays by improving the emission process
Author :
Stevens, R. ; Thomas, C.B. ; Cranton, W.M.
Author_Institution :
Dept. of Electr. & Electron. Eng., Bradford Univ., UK
fDate :
3/1/1994 12:00:00 AM
Abstract :
AC thin film electroluminescent (ACTFEL) devices emit light laterally in addition to conventional surface emission. Because of the waveguiding in ACTFEL devices, lateral emission is stronger than surface emission. However, the former is ignored for displays. This note demonstrates that mirrors can be fabricated into substrates to reflect upward the lateral emission, which can then be summed with surface emission for displays. Use of standard silicon and thin film technology has demonstrated that the reflected lateral emission is a factor of three brighter than conventional surface emission. hence the effective efficiency of out-coupling the light has been improved for an ACTFEL device.<>
Keywords :
electroluminescent displays; mirrors; thin film devices; ACTFEL devices; effective efficiency; emission process; lateral emission; mirrors; out-coupling; surface emission; thin film technology; thin-film electroluminescent displays; Brightness; Displays; Electroluminescent devices; Mirrors; Semiconductor thin films; Silicon; Substrates; Surface waves; Thin film devices; Transistors;
Journal_Title :
Electron Device Letters, IEEE
