What is a Nano Cell?
January 10, 2017
LG’s new ‘regular’ TV line is focused on ‘Nano Cell’ technology, which actually filters the light coming from an LED and reduces the spectrum spread. Nano cell is an ultra-tiny organic particle that is approximately one nanometer in diameter. With these nano cells coated on the color filter, LG’s SUPER UHD TVs offers consistent colors at wider viewing angles with virtually no color difference seated directly in front of the screen and those watching from a 60 degree angle, according to the company. The graphic below represents the relative intensity of light at various wavelengths for a ‘typical’ modern WLED backlight.
Figure 1 LED Spectrum
There us a distinct peak of spectral energy in the ‘blue’ region, specifically at 450nm (light considered ‘pure blue’). This comes from the blue diode of the backlight, which is typically composed of InGaN (indium gallium nitride). A much weaker spectral response of less than a third the intensity can be observed between 500nm and 700nm, corresponding to the ‘yellow’ light of the typical scintillator phosphor coating; YAG (yttrium aluminum garnet). In combination the InGaN and YAG components of the backlight produce ‘white’ light with a native color temperature (white point) determined by the ratio of InGaN to YAG. What the nano cell does is narrow spread between the peaks, providing greater intensity to each of the targeted colors. Given that the new TV line is said to be 25% brighter than the previous line, the light extraction films operate in a manner similar to quantum dots, without the higher cost.