Patent ID: 7135712

Claim:
An electroluminescent device comprising: an electroluminescent layer having luminescent regions i=1 to N, with N>=1, each adapted to emit light within an emission wavelength range Δλ EL (i); a light-reflecting surface comprising one or more light-reflecting surface regions arranged, with a light-reflecting side, opposite respective ones of the luminescent regions, the surface regions being capable of inverting the handedness of a circularly polarized component of light incident on the surface regions; arranged on a side of the electroluminescent layer facing away from the light-reflecting surface, an absorbing circular polarizer adapted to absorb one circularly polarized light component and transmit the light component orthogonal thereto; and arranged between the absorbing circular polarizer and the electroluminescent layer, a reflective circular polarizer comprising reflective circular polarizer regions i=1, . . . , N, with N>=1, the i-th circular polarizer region being arranged opposite the i-th luminescent region for all i=1 to N, each circular polarizer region being adapted to reflect, within a reflection wavelength range Δλ cir (i), the circularly polarized light component the absorbing circular polarizer is adapted to absorb, and transmit the component orthogonal thereto; wherein the reflection wavelength range Δλ cir (i) is a sub-range of the emission wavelength range Δλ EL (i) for at least one region of the regions i=1 to N.