[Quoth]

Originally Posted by rashkae

We're going in circles repeating the same things over and over again, but yes, there is visible speckle in the background,


However, as I can judge both by in person usage and macro photographs (which I posted in a previous thread where the same inane discussion took place,) the font rendering is just as sharp and clear. And more than a match for pre Carta 800 300dpi screens.

Yes, you like it and refuse to believe actual facts and repeat the same opinions.

What is a "pre Carta 800 300dpi" screen?

None of the below is opinion.

Kindle 2012: Paperwhite 1 6 in, 212 PPI E Ink Pearl display
Kindle 2013: Paperwhite 2 6 in, 212 PPI E Ink Carta display

The first 300 dpi is now called Carta HD
Kindle 2014 6" Voyage and cost reduced version the Paperwhite 3 in 2015 (both 300 dpi Carta HD).


The eink Corp (5" not listed).

2007 Vizplex (6" 167 dpi)
2008
2009 Vizplex (9" 150 dpi DX)
2010 Pearl & Triton(various 167 dpi 6" and 150 dpi 9" DXG)
2011
2012
2013 Carta (212 dpi, 6" PW2)
2014 Carta HD (Voyage. 6" 300 dpi, one of the best 6")
2015 Carta HD (PW3. 300 dpi)
2016 Carta HD (Oasis 1. 6" 300 dpi)
2017 Carta HD (Oasis 2. 7" 300 dpi)
2018 Carta HD (PW 4. 6" 300 dpi flush screen)
2019 Kaleido (The year Kindle Basic gets a front light and a better screen, but is still 167 dpi)
2020
2021 Carta 1200 (PW5 is 6.8" 300 dpi and adjustable colour front light)
2022 (First Kindle Basic with 300 dpi)
2023 Carta 1300

The Oasis 3 (7" 300 dpi) was 2019 to 2024. Warmer front light than Oasis 2.

Pearl is very good, but only if no additional layers (light pipe for front light, capacitive touch).

At some stage the Carta (maybe 1200?) is improved by eink making the panel with the capacitive touch, instead of a 3rd party panel, which improved contrast a little.

The original E Ink Carta display was renamed to Carta 1000, and refinements in Carta 1100 and Carta 1200 improved response times and display contrast.[54] A later refinement in Carta 1250 improved response times and contrast again.[55]

https://en.wikipedia.org/wiki/E_Ink#...odels_of_E_Ink See also eink's own site.
Carta HD seems to be simply the 300 dpi version of Carta 1000, but might be Carta 1100. All 300 dpi are Carta HD, or later panels.

The 5" Vizplex and Pearl (Sony and Kobo) must be about 200 dpi as they are 600 x 800 and about 3" x 4".

Triton (2010) used Pearl with three R G B stripes on square pixels (unlike 1/3rd pixel width LCD) so resolution is terrible as it's 1/3rd across stripes and it's about x5 darker. There are several versions

Kaleido is a 2 x 2 coloured dot pattern (Carta family) so resolution is 1/2 in both directions. The various versions adjust the dot coverage and Kaleido 3 uses Carta 1300 mono panels, which are marginally better than Carta 1200, which are marginally better than Carta HD. The fact that the dots don't cover the pixels means it's brighter than Triton, but makes it very pastel. It also allows 300 dpi mono rendering to display, but with artefacts depending on shape / angle of any 300 dpi detail.

All 300 dpi appear to be Carta family. There are some Carta family screens less than 300 dpi, particularly the H2O Original 6.8" and larger than 8" screens.

E Ink Carta HD features a 1080 by 1440 resolution on a 6" screen with 300 ppi. It is used in many eReaders including all new Kindle model lines since 2014 (Voyage, Oasis, Scribe) as well as the Paperwhite 3 (2015) and newer, Tolino Vision 2 (2014), Kobo Glo HD (2015),[50] Nook Glowlight Plus[51] (2015), Cybook Muse Frontlight, PocketBook Touch HD[52] (2016), PocketBook Touch HD 2 (2017), and the Kobo Clara HD[53] (2018).

The 9.7" seems only to have ever been 150dpi, (Viziplex, then Pearl a year later). At least one non-Kindle uses it.

All Carta family models allow Regal wave form for less full refreshes (but seems limited, a full grey scale doesn't seem to work with Regal mode). Kaleido is a 2 x 2 array, rather than stripes, so likely (opinion) can't use Regal when there is colour content as Regal would be limited to maybe less than 16 of the 4096 (all shades of saturation and greys, not 4096 hues).

The main difference between 2019 Kaleido and 2023 Kaleido 3 is simply Carta HD vs Carta 1300, so the contrast and brightness is slightly improved but still too poor for ambient light (Needs front light).
Kaleido is simply printed red, green and blue dots on a mono eink panel. The only complex technology is accurately printing the correct dots on roughly the middle of the pixels. Once you have that, the extra cost of Kaleido is negligable. The ereader software was already supporting colour (based on screen shots of ebook covers on the original Kobo H20, as they are RGB colour).

Advanced Color ePaper (ACeP) is from 2016. It's a completely different stable display that works like subtractive colour printing on paper. Sadly it's at least x10 slower than regular eink, which is already 100 times slower than active displays.

Onyx speed up eink refresh using custom hardware and higher voltages. This seriously impacts run time per charge.
Eink takes no power to display but uses a lot of power to refresh. An 8" 300 dpi panel thus takes nearly twice the power to "page turn" than a 6" 300 dpi eink.

There has been no increase in ppi / dpi beyond 300 dpi in the last 10 years. Kaleido colour really needs a 600 dpi panel to give the same quality as 300 dpi mono, and even then it will need the front light and have slightly less contrast due to the coloured printed dots reflecting.

It's handy to have a front light, but with it on the eink loses one advantage of OLED or LCD with a true matte screen. Battery life is no longer an advantage.