**It seems that you have no space between your pixels and your fill ratio is 100%**. Trigonometry also create too much rounding errors, I set up the formula X^2(16^2+9^2)=0.69^2 and solved for X. This gives the exact height and width of the chip. I then used the 3.8 micron gap and resolution to calculate the area used by the grid line to determine fill ratio. I also used other techniques to avoid unforced errors and the resulting fill ratio looks legitimate.

**Edit:** a quick and dirty check using dimensional analysis lead me to believe that if the chip has thousands of vertical/horizontal resolution (1*10^3) the pixel pitch should be in milli and not microns for units; or closer to 157 microns.

I still respect your good intent in fact checking my comments.

I respect your contribution and effort to keep the Science in AVS!

**the chip is not 16:9, its 17x9**.

That's why I used 4096 and 2160 in my calculations. And we don't want to solve for X, since its already known at .69"

**a .69" chip is about .6103" horizontal X .3219" vertical**

(roughly, JVC probably rounded .69" off lol)

There are 4096 horizontal pixels.

The absolute biggest pixel that we can fit 4096 of them in only .6103" inches room is a 3.78um pixel.

yes, exactly, good catch, this is indeed assuming a 100% fill ratio. Reason: what's the biggest that will fit assuming a perfect 0.0 gap? The actual pixel has to be smaller of course, but have to find the physical limit first. This defines the pixel pitch which in a 4K .69" inch chip ends up 3.78um (~ 3.8um)

If the gap is 3.8um, is not possible to fit any pixels in at all since the gap would be larger than the largest possible 3.78um pixel we can physically cram in!

**Maybe that's the secret of JVC's contrast, the pixels are negative in size and are sucking up light! **
The only way to calculate fill ratio is if we knew what the actual gap is, or what the actual pixel size is. We do know pixel pitch is 3.78um. I supplied synopsis of calculations previously. Perhaps there's a fat finger in there.