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Dim Display

Another tip: Check your sunglasses. If you have polarized lenses, the display might appear dim or black because of the lenses in your sunglasses.

Tip your head 90 degrees to the right and left while looking at the display. If it gets brighter and dimmer while your head is tipped to the side, it's your glasses.

Another clue is to look through your rear window with your sunglasses on. If you see gray polkadots, your sunglasses are polarized.

The display is polarized because of the liquid crystal inside the glass panel. I don't want to go into a technical explanation of how liquid crystals work, but suffice it to say that they are polarized. For example, try looking at a watch or calculator with an LCD display, while wearing polarized sunglasses. By rotating the device, you will see the display alternate between black and normal.

Not much you can do about that, except don't wear the sunglasses, get new sunglasses that aren't polarized, or just put up with it. -- Just a small annoyance that is certainly not a good reason to avoid buying a Prius (or about any car with an LCD panel in the dash).
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