White or Black Background for Battery Saving?

trux said:

Exactly! But when you claim the elephant is there (and that's what you do), you should back it with some evidence (other than belief).

I've never opened the Instinct Solar to see what's inside.  For the same reason's tess gave, dc rainmaker has given no reason to believe what he said isn't true.  It's ok to question anything, but you haven't given anyone any reason to believe what you say is true.  This seems difficult for you to understand and it's now personal for you.  Show us all the proof.  To turn it around and say prove it exist after YOU were the one who said he was wrong is a sorry defense.    

Show us all the proof.

I did repeatedly. Solar cells cannot be used beneath the MIP display because it is not transparent (it is reflexive). And if it were transparent, and sollar cells would be on the background, you woud not see anything on the display, since solar cells absorb the light, they do not reflect it.

trux said:

Solar cells cannot be used beneath the MIP display because it is not transparent (it is reflexive)

You're saying that it's a physical impossibly that any light could reach any solar cells beneath the display?  It's a fact that Garmin's MIP display is impregnable to any light?  It's impossible for any solar panel beneath the display to be responsible for 10% of it's charging capabilities?  Solar panels convert visible light into electrical energy.  They can also use up to half of the infrared energy and a portion of ultraviolet energy to do so.  But you're saying you know for a fact that this is an impossibility with the Instinct Solar and a reputable source that Garmin uses is wrong?  You have 100% knowledge of how the Instinct Solar was designed and can say what it's capable of doing without providing any proof?  Like I said early trux.  I got it.

trux said:

this is the type of display (MIP) used in Instinct. Now imagine what a solar cell placed beneath it can harvest.

Show me where this is the type of MIP used?  There are three types.  Reflective, trans-reflective and transmissive.  Which one reflects light and which allow light to pass through?  You're trying, but not hard enough.

They can also use up to half of the infrared energy and a portion of ultraviolet energy to do so.

That's exactly what is being done by the Power Glass under the screen (above the display) - it absorbs practically all UV and IR light. The power Glass is transparent to visible light only. Hence no, it makes no sense trying to harvest the IR and UV light again under the Power Glass - there is practically nothing left.

And if the imaginary cells under the imaginary transparent MIP displayed absorbed visible light, you wouldn't see anything on the display, even if only part of the light was absorbed. Definitely not a bright white background as at Instinct.

Which one reflects light and which allow light to pass through?

According to Garmin specs it uses "monochrome, sunlight-visible, transflective memory-in-pixel (MIP)". It means the light coming from outside is being refected, while it permits to use the backlight. So the problem persists - if there were solar cells on the backside, they would not get any light. On the other hand they could emit the light 

trux said:

it makes no sense trying to harvest the IR and UV light again under the Power Glass - there is practically nothing left.

trux said:

if there were solar cells on the backside, they would not get any light.

That's an interesting theory you now have on light and penetration.  This goes against your own test you conducted and posted 8 months ago in this thread.

Design flaw: Sensor opening in the wrong place. What now? - Instinct - Wearables - Garmin Forums

Let me refresh your memory with a clip from what you said.

 I wanted to test something by hindering the HR from properly functioning, so attached it over a sleeve, and it still worked. I taped the optical sensor with a duct tape, and it still worked. I added a piece of leather and it still worked. I used a metalized foil and it still worked. I had to use a combination of metal foil and an inuslating layer to finally make it fail. It means the sensor captures not only visible light, but also IR

This goes against your own test you conducted and posted 8 months ago in this thread.

No, it does not go against it at all. 

Power Glass is transparent to visible light, while it absorbs 95% of IR, and 99% of UV light - that's a fact documented on the webiste of SunPartner Technologies (the producer of the solar panels for Garmin, in fact one of Garmin's daughter companies). 

A metal foil, I used in the HRM experiment, is also a good screen for the IR radiation, but in the same time it is an excellent conductor of heat (unlike glass). So if you place it directly on the skin, although it reflects the direct IR radiation from the body, it conducts the thermal changes to the outer surface. And that's exactly why only the combination of an insulator (the leather layer) and the metalic foil worked for blockig the signal - this combination prevents all three forms of the thermal transfer - conduction, convection, and radiation.

However, whether the HRM experiment was right or not, changes noting on the fact that the Power Glass absorbs practically all IR+UV light. and hence only visible light can be harvested beneath it.

Bullet said:

Power glass is above the display. See my picture. 

Yes, that's correct, it is the same picture I already posted here, just from another angle.

Bullet said:

outer ring of powerglass takes 100% from sun and rest of the glass takes 10% because there is no solar cells there

This is incorrect. The Power Glass is fully (100%) covered with transparent solar cells harvesting the IR and UV light, letting the visible light through. Its efficiency approaches the 10% (ideally, in relaity probably less). The outer ring of solar cells are standard Si non-transparent cells under the glass, around the bezel. Their efficiency, due to the missing UV+IR (aborbed by the Power Glass) is around those 10% too, but their surface area is smaller (perhaps 40% of the total surface?), hence their contribution will be a bit less significant than at the Power Glass.