The trouble is that liquid-crystal shutters absorb over 90 % of the light passing through them , even when they are open .
困难之处是液晶百叶窗吸收了超过90%的通过光,甚至其张开时也是如此。
Instead of reflecting ambient light , its perfectlight technology uses tiny shutters that open and close quickly to allow through light from a backlight composed of red , blue and green light-emitting diodes .