E-Ink's Gallery 3: 300dpi
#1  kyteflyer 04-26-2022, 04:30 PM e=1

I'm not sure how this directly relates to e-readers, as they speak of paper... can someone explain?

#2  kyôdai 04-26-2022, 05:02 PM
Hey there,

E-Ink is adding yet another color display to their portfolio.
Yesterday, they announced the "Gallery 3 Color", based on their ACeP technology, will join the recently updated "Gallery Plus Color".

While the "Plus" version, like its predecessor, is only geared for commercial signage and public information displays, the "Gallery 3 Color" is intended for use in ebook-readers.

Here you can find the press release:

-> e=1

E-Ink says the new display has a 300ppi color resolution, showing upto 50.000 colors.

They have significantly improved the refresh rate of the display compared to the first generation (where a full screen refresh could take upto 10 secends).

The new display has multiple refresh modes. It takes 350ms in black/white mode, 500ms in "fast color" mode, 750-1000ms in "standard color" mode and 1500ms in "best color" mode.
Screenshot 2022-04-26 at 22-48-01 Gallery 3.jpg (JPEG-Grafik 1600 × 1067 Pixel) - Skaliert (91%).png E%20Ink%20Gallery%203%20Rollable.jpg E%20Ink%20Gallery%203%20Foldable.jpg 

#3  pdurrant 04-27-2022, 07:25 AM
This looks really interesting. B&W refresh at 300ms is very good. A maximum refresh for best colour of 1.5s is acceptable, given that there's a slightly lower quality 0.5s refresh rate for colour.

And 300dpi colour... it's a big improvement on the colour displays that use a colour filter in front of a B&W display.

I would be very tempted if a Kindle came out using this display, even if just for the book covers!

#4  jhowell 04-27-2022, 09:30 AM
Quote pdurrant
I would be very tempted if a Kindle came out using this display, even if just for the book covers!
I would be tempted also, but I doubt that the added cost would be worth it for me to actually go ahead and make the purchase.

#5  Pajamaman 04-28-2022, 09:28 AM e=1

They have examples of foldable, bendable color e-ink panels. I can see this stuff revolutionizing panels, TVs and reading material in the future.

#6  kyôdai 04-28-2022, 05:24 PM
E-Ink released another new video today.
They are demonstrating all their new color displays at their booth at this years "Touch Taiwan 2022" exhibition.

YouTube clip »
vlcsnap-2022-04-28-23h09m20s520.png vlcsnap-2022-04-28-23h09m36s672.png vlcsnap-2022-04-28-23h07m38s034.png vlcsnap-2022-04-28-23h10m16s800.png vlcsnap-2022-04-28-23h08m54s851.jpg vlcsnap-2022-04-28-23h07m07s307.jpg 

#7  Quoth 04-29-2022, 05:46 AM
I always wrote that colour epaper needed a different technology to R G B filters on a mono eink screen, which is inherently poor due to intrinsic physics and maths. I suggested a four layer C Y M K (Cyan, Yellow, Magenta. K= Black, but can mean white with black/grey) was the solution. Early colour photography used R G B dots but was only viable years later using C Y M layers.

It will be interesting to see how it really works as each layer has to be transparent or coloured or somewhere between. Traditional eink isn't transparent.

It's pretty slow so won't do video/tv/animation.

It will be interesting to see how bright the whites are in ambient light compared to regular eink, contrast ratio, how many levels of grey and saturation and gamut.
In theory the lighting layer can be below the three C Y M layers and above the "white".

An issue is viewing angle. This is limited by the thickness of each layer vs size of the pixels.

Also I think there isn't a huge point to much less than a 10" screen if you look at size of colour illustrated books, magazines, graphic novels and comic. Most of my 3000+ books are monochrome and most just text. Most of the coloured books I have are quite large; larger than 10" diagonal

The price and battery life will be important. Are the C Y M cells bistable like regular eink?

#8  pdurrant 04-29-2022, 09:26 AM
There are no layers - all the colours are in the sample capsule. There's some clever tweaking of electrical properties that allows one of the colours to be displayed in preference to the others, or white. Yes, they're bistable (or quad-stable) like regular B&W e-ink.

eInk mention 300dpi B&W and 150dpi colour, so I think they're not able to mix colours within a capsule, so full colour needs to be a sub-cell of four dots. But with much better contrast and saturation than from colour filters in front of B&W cells.

#9  Quoth 04-30-2022, 09:02 AM
R G B can only use parallel sub cells. Additive colour model.
C Y M can ONLY use layered sub cells. Subtractive colour model.
It's basic physics.
Additive mixing (sub pixels in parallel). Dots or cells are side by side.
G + B = C
R + G = Y
R + B = M
R + G + B = W
Vary proportions for other hues and saturations.

Subtractive Colour Mixing uses cells or pixels in layers.
C blocks Red
Y blocks Blue
M blocks Green
Thus Layers
White - C - Y = Green
White - C - M = Blue
White - Y - M = Red
White - Y - C - M = Black. Because print pigments are not perfect black is also used or you get a dark muddy colour.

Using C Y M print the pigments or transparent cells are superimposed.
R G B needs the dots side by side.

Projectors & cameras currently use either R, G & B added in a prism, OR red, green & blue filter or spinning R G B clear wheel on monochrome. Some displays might use also yellow for brightness. Some cameras and displays don't stripe R G B but use a Bayer pattern.

You could use a single cell with mix of multiple Cyan, Yellow and Magenta balls if there was a way of separating them. It was a lie-for-children in art class that you used red, yellow and blue primary paints. The red was closer to magenta and the blue closer to cyan or you couldn't get very many colours by mixing.
It's not impossible that they have cyan, yellow and magenta in one cell and mix like paint. I can't imagine how that's done compared to three thin layers of cyan, yellow & magenta balls in a clear liquid that can be move to sides of cell or face of cell.

No doubt eInk Corp will explain more later.

#10  pdurrant 04-30-2022, 09:09 AM
A fair point about the difference between additive and subtractive. But I think you're missing something.

Cyan reflects Green and Blue light.
Magenta reflects Red and Blue light.

Red, Green and Blue light makes white.

So putting dots of Cyan and Magenta next to each other will give Red. Similarly for other combinations. So I think it is theoretically possible to do a display using CMY pigments with side-by-side cells, not layered.

We'll have to wait for people to examine the display in close-up to find out for sure.

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