Quote:
Originally Posted by blue_skies
The video presenter is optimistic that they will be able to lessen the dithering before the Bigme Galy is released, but since I get horrible migraines from PWM flickering, I won't take a chance on having a device that flashes as the screen changes.
On the other hand, the demos of the eink Kaleido Plus screens looked very nice to me, even though the colors are muted and not as sharp.
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The Gallery-ACEP technology doesn't seem to be regular eink, though from the E Ink company. I'd be sceptical that it will ever be acceptable for a reader due to slow page refresh (up to 1.5 second) and "effects" while it happens.
Kaleido is simply regular mono eink with a colour filter. There are two main kinds possible.
Dots:
R G
G B
It gives 150 dpi in colour and sort of 300 dpi in mono
The older kind of layout is stripes
R G B
Thus its 100 dpi x 300 dpi colour and sort of 300 dpi in mono.
The problem is that real eink has black, white and 14 shades. So you only get about 4,000 different shades and hues.
You can make the filters good, and the colour is strong but it's dark, needs frontlight all the time.
Or if you make the colours pastel then the filters don't darken it so much, but it's still far darker than mono eink.
This is basic physics. So how can they make it better?
Perhaps higher resolution and paler colours mixed with mono?
R W G W B W G
W G W R W G B
Or the filter on inside front of cell
Or no filter, but cells with green & black balls, red & Black, blue & black instead of white & black balls.
Or red, green and blue liquid cells with only black balls.
It's hard to see how they can do a better Kaleido. The original was too dark because they wanted the colour more saturated. The newer one is brighter because it only has pastel shades (tints). All Kaleido have lower resolution than a mono panel.
It's possible to have LCD with less flicker than OLED at the same refresh because LCD can't change state quickly. Quantum film/dot LCD, usually called QLED have only blue instead of white backlight and are twice to four times brighter. All LCD and OLED can be at sufficient high refresh that there is no flicker.
Edit
Reading this
https://www.businesswire.com/news/ho...per-Technology it seems to me the main difference with Kaleido 3 and earlier is built-in front light and their best mono panel. So like the best mono eink today but dimmer without front light and inhernetly the colour filter means you lose resolution.
Just an incremental tweak. But better for reading than Gallery3 AECP which seems only fit for signage.