>>563 〜
Linearly polarized light is required for most LC devices. A few polarization conversion devices have been invented to convert unpolarized light into linear one.
So that, the conversion efficiency reaches 70 〜 80 % . Furthermore, an array of microlenses is utilized to raise aperture ratio of a high resolution TFT-LCD panel.
The effective aperture ratio was improved to 〜 80 % for a XGA device.
In many cases, the power efficiency of 10 〜 15 lm / watt in a projection system with three transmissive LCD panels has been routinely obtained.
Under such circumstance, 1000 〜 1500 lumens can be produced on a screen with a 100 W short-arc lamp.
