P‐4.15: Low Blue Light Backlight Unit for Eye Protective LCD

Abstract

With the expansion of the markets about near‐eye display devices and other similar consumer devices, the security of display devices has also received more and more attention. So in this paper, a novel low blue light backlight unit for eye‐protective liquid crystal display is reported. The low blue light characteristic is achieved by a LED with long wavelength (>457nm) chip and K2SiF6:Mn4+phosphors or Red/Green phosphors. The screen with this backlight unit can realize 86% NTSC color gamut with a slight decrease in brightness, 8% or so. In addition, the ratio of toxic blue light region (wavelength ranges from 415nm to 450nm) to the whole blue light region (wavelength ranges from 400nm to 500nm) is less than 40%. Especially, the ratio can be less than 15% if using the chip with longer wavelength (>460nm) and Red/Green phosphors. The screen also reaches the TÜV Rheinland low blue light display certification standard.