Active solid-state devices (e.g. – transistors – solid-state diode – Incoherent light emitter structure – With reflector – opaque mask – or optical element integral...
Reexamination Certificate
2006-11-14
2006-11-14
Smith, Zandra V. (Department: 2822)
Active solid-state devices (e.g., transistors, solid-state diode
Incoherent light emitter structure
With reflector, opaque mask, or optical element integral...
C257S098000, C257SE31096, C257SE31129, C438S690000
Reexamination Certificate
active
07135712
ABSTRACT:
An electroluminescent device (13), such as a light emitting diode, which has a light-reflecting surface (10) causing undesirable reflection of ambient light incident on the device is provided with a combination of a reflective circular polarizer (17) and an absorbing circular polarizer (23) to suppress the undesirable reflection of ambient light thus improving the contrast of the device when used under high intensity ambient lighting conditions while maintaining a satisfactory brightness. The reflection band of the reflective circular polarizer regions (17′) of the reflective circular polarizer (17) are preferably tuned to the corresponding emission band of the luminescent regions (9′) of the electroluminescent device to further increase the contrast of the device while substantially maintaining the same brightness.
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Broer Dirk Jan
Van Tongeren Henricus Franciscus Johannus Jacobus
Visser Robert Jan
Chiu Tsz Kit
Koninklijke Philips Electronics , N.V.
Smith Zandra V.
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