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To raise the color saturation of a liquid crystal display for better image quality, a manufacturer in this field has proposed an approach which applies a film called Quantum Dot Enhancement Film (QDEF) to a backlight module consisting of blue LEDs. Quantum dot enhancement film has a plurality of quantum dot phosphors of different sizes to convert the incident blue light to light having different wavelengths. Thereby, the spectrum of white light mixed from the light having different wavelengths is wider such that the color saturation of the display is higher.

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