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The conventional LCD was designed around fluorescent backlights but bright LEDs make different compromises possible. A suitably designed light-guide lets us collimate the light then diffuse it over a precise range of angles, eliminating waste. There is the potential to scan the direction of collimation in the horizontal so that light is always concentrated to the head of the user, but users also move in the vertical and forward and back. I will discuss more advanced backlight concepts, which would let us concentrate rays into the users' eyes whatever their position, thus eliminating unseen light and reducing the optical power budget to near zero. |
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