Quantum Dot Enhancement Film for Improved LCD Displays

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Quantum dots are semiconductor nanoparticles that range in size from two to 10 nanometers[fn]http://www.nanocotechnologies.com/content/AboutUs/AboutQuantumDots.aspx[....  The variations in the size of the quantum dots control the color and physical properties of quantum dots.  The ability to tune these quantum dots makes them ideal candidates for LCD backlights.

The new Quantum Dot Enhancement Film (QDEF) developed by Nanosys and 3M incorporates trillions of red and green quantum dot phosphors into a thin film that can be used to replace the diffuser film in LCD display panels.  The conventional diffuser film consists of Yttrium Aluminum Garnet (YAG) phosphors, which is overlaid on blue LEDs to produce the “white” backlight used in conventional displays.  This causes the green and red colors produced by conventional LCD displays to be weak and dull.

Replacing the YAG diffuser with an optically clear QDEF sheet and the blue LED backlight creates a white light with a backlight color spectrum matched to the screen’s Red Green Blue (RGB) color filters[fn]http://www.nanosysinc.com/what-we-do/display-backlighting/qdef-how-does-....  This results in much deeper and richer colors.  The QDEFs are manufactured as direct replacements of the diffuser sheets in displays, allowing them to be easily incorporated into the display manufacturing process without retooling or new equipment.  This will result in red and green color reproduction comparable to more expensive organic LED displays.  Additionally, the QDEFs have a very high quantum efficiency of at least 90%, allowing screens to reproduce vibrant images much more efficiently than conventional phosphor YAG technologies.

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This product enhances the color reproduction of LCD displays, making them more comparable to organic LED displays in depth of color.

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The use of quantum dots in LCD displays reduces costs, energy consumption and resources inputs required to produce better picture quality than conventional YAG LCD displays. QDEF technology may offer a cost effective alternative to OLED screens in terms of picture quality.

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The proprietary nature of the technology makes creating a risk profile difficult. Without knowing the composition of the quantum dots or the fabrication processes for making the QDEF inserts, it will be hard to determine the ecological or human health risks of this technology.

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