Quantum dot nano crystal LCD backlight system and related method

摘要

A system and method are disclosed employing a dielectric mirror layer, highly reflective at wavelengths below a cut off but highly transparent at wavelengths above the cut off, is placed within a display assembly. This dielectric mirror layer creates a very efficient reflecting cavity for a portion of a Light Emitting Diode (LED) pumping spectrum. Accurate dielectric filter tuning allows an increased portion of the pumping spectrum to be converted to desired wavelength spectrum and also raise the luminance ratio of the display to a useful value for display applications. Variable and active tuning of the cut off wavelength value functions to optimize system performance.

主权项

1. A system for efficient conversion of light through a display assembly, comprising:
a light source configured to emit a light spectrum comprising a first wavelength spectrum; a quantum dot nano crystal layer, the quantum dot nano crystal layer configured for conversion of the light spectrum from the first wavelength spectrum to a second wavelength spectrum; and a dielectric mirror layer, the dielectric mirror layer more distal from the light source than the quantum dot nano crystal layer, the dielectric mirror layer configured for reflection of the first wavelength spectrum and for blocking the transmission of the first wavelength spectrum, wherein an unconverted portion of the emitted light spectrum comprising the first wavelength spectrum is substantially reflected by the dielectric mirror layer toward the quantum dot nano crystal layer, the dielectric mirror layer further configured for transmission of the second wavelength spectrum, wherein the quantum dot nano crystal layer is further configured for conversion of the reflected unconverted portion of the emitted light spectrum to the second wavelength spectrum.