E-Ink vs. real Paper - Contrast and Brightness
Today I've read about the new E-Ink technology. It will offer 12:1 contrast ratios (up from 7:1). That sounds great, it nearly doubles the contrast ratio. But to have a comparison, what contrast ratio does paper have? Someone here in the forum wrote, that old paper turns yellow-ish and you also lose contrast. So for a comparison it seems to be important which kind of paper you use - is it recycled paper, is it new white paper on which you print with your own printer, is it a book or is it a magazine.
How do you measure the differences in readability between real paper and E-Paper? Contrast ratio? Brightness? Also there seems to be a difference with the plastic layers above the actual display and if it has touch support or not (Sony PRS-505 and PRS-600). Though both displays should have the same contrast ratio, the PRS-600 looks darker and seems to have a worse contrast ratio.
In 2007 E-Ink announced the second generation of their epaper technology Vizplex, which had the following enhancements:
* Typical Switch Speed: 740 ms (previous: 1200 ms)
* Peak Switch Speed (monochrome): 260 ms (previous: 500 ms)
* Brightness (reflectance): 40% (previous: 32-35%)
* Greyscale levels: 8 (previous: 4)
I found nothing about a change in contrast from the first to the second E-Ink generation.
Also do you have any information about the contrast and brightness of other technologies (Sipix, Mirasol, Liquivista, Pixel Qi)?
Thanks in advance for your answers