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Put two coatings onto each lens: The first coating is an LCD, which darkens when electrified, the second coating is a thin-film photovoltaic cell, which produces electricity when lit by any light.
When the sun powers up the PV layer, it darkens the LCD.
should have gone to specsavers, Virgil...
http://www.youtube....watch?v=eTv1KqYn-oM
[po, May 28 2009]
Translucent Photovoltaic Cells
http://solartechtimes.com/?p=364=1
[loonquawl, May 28 2009]
Short blurb on auto-darkening helmets
http://www.asashop....n2002/collision.cfm
[loonquawl, May 28 2009]
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Annotation:
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Hmmm. Is the only reason to allow INSTANT darkening?
Polaroid Sunglasses ant that slow are they? |
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I could see this being useful if you can adust the colors.. maybe even be able to add in some custom images.. like something that looks like a pair of eyes so that you can look wide away while you are sleeping. |
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//Polaroid Sunglasses ant that slow are they// |
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Sp. Photochromatic. And yes, it does take about 3 seconds. Polaroid is just a brand, and anyway, it's "polarised" you're referring to, which is simply the filtering out of vertically biased light (including most "glare") in preference to horizontally biased light. |
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What you're looking for is the same technology used for automatic darkening welding helmets. These react quickly enough to prevent eye damage during arc welding (something like 1/1000 of a second reaction time). Typically they use a photovoltaic cell and an LCD layer over the viewing pane. |
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This is what I don't get. If the glass absorbs light, shouldn't it be getting brighter, not darker? Where does all the light go? |
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into the black hole what is your pupil! |
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I second [Custardguts], the proposed technology is baked by auto-darkening welding goggles, although [goldbb] proposes the PV-module to be in the line of sight. This would be possible with translucent PV-cells, which are currently baking [link]. The efficiency of those cells is projected at ~6%, which is better than the cheap amorphous ones they use in the helmets. This means that at least 6% of the light will be filtered at all times, so the glasses would never be totally clear, (the article does not mention which wavelengths are used/filtered, so maybe it has 100% translucency at visible wavelengths. [+] |
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[I_T] - the term photochromatic is rather widely used. Perhaps it's just a proprietary term like polaroid is for polarisation.... |
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Thanks for the links, especially about auto-darkening helmets. |
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Inspired by that, I'd like to suggest that one additional feature might be to make the tinting of the lenses adjustable. |
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gnomethang, The problem isn't really that photochromatic lenses are slow to darken... but that they're slow to become transparent afterwards. It just would have been too long a title to say, "Instant clarifying tinting glasses" :) |
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