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US 8,804,069 B2Granted
Backlighting system including a specular partial reflector and a circular-mode reflective polarizer
Assignee3M Innovative Properties Company
InventorsMark B. O'Neill, Philip E. Watson, Matthew B. Johnson, Adam D. Haag, Keith M. Kotchick, Sergey Lamansky
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Abstract
A backlight that includes an illumination device that has at least one light source, a circular-mode reflective polarizer, and a specular partial reflector is disclosed. The specular partial reflector is disposed between the illumination device and the circular-mode reflective polarizer. Furthermore, the specular partial reflector is in substantially direct polarization communication with the circular-mode reflective polarizer.
Claims12
A display, comprising:
- an illumination device comprising at least one organic light-emitting diode;
- a circular-mode reflective polarizer;
- and
- a specular partial reflector disposed between the illumination device and the circular-mode reflective polarizer, wherein the specular partial reflector has an orthogonal reflection fraction value of at least 2%.
1 more element
A display, comprising:
- an illumination device comprising at least one organic light-emitting diode;
- a circular-mode reflective polarizer configured to transmit a first portion of light having a first circular polarization and reflect a second portion of light having a second circular polarization orthogonal to the first circular polarization;
- and
- a specular partial reflector disposed between the illumination device and the circular-mode reflective polarizer, the specular partial reflector suitable for receiving the second portion of light from the circular-mode reflective polarizer and returning a third portion of light to the circular-mode reflective polarizer, the third portion of light being a fraction of the second portion of light and having the first circular polarization that is transmittable by the circular-mode reflective polarizer.
1 more element
Dependencies are inferred from the claim text.