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Add one more comparison photo

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Wenting Zhang 2024-07-04 00:08:25 -04:00
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README.md
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@ -421,8 +421,12 @@ There are several different technologies that could be used to build full-color
The following picture has a CFA-based color screen (Kaleido 3) on the left, and a multiple pigment color display (Spectra 6) on the right, displaying the same image.
![sp6vsk3_2](assets/isabella.jpg)
![sp6vsk3](assets/kaleido3spectra6.jpg)
(Yes the left one IS a color screen!)
#### Color Filter Array
CFA stands for color filter array, which is colored glass/ film on top of the screen pixel. This is also the technology used on most color LCDs. Eink Kaleido, Eink Triton, and color DES are based on this technology. The main advantage is that it's relatively simple to control, and the low-level driving is the same with the greyscale panels. Thus it has the same level of refreshing time (100~200ms), and the same level of greyscale (16 level translate to 16^3=4096 colors). The drawback is that the CFA filters out some light (due to its colored nature), and the screen reflectivity is negatively affected by the CFA. The screen ends up being quite dark. Up to now, most color E-readers use CFA-based displays. This project supports all three major types of CFA-based EPD screens: color DES screen, Eink Triton, and Eink Kaleido.

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assets/isabella.jpg Normal file
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