What you need for palm rejection and accurate handwriting is an electromagnetic layer in the screen, such as that made by Wacom.
You have three major options:
1. Color LCD tablets. This is the most versatile solution and there are several Android and Windows tablets with this technology, such as the Samsung Galaxy Note 8 or 10.1, or the Microsoft Surface. They usually can digitise your handwritten notes and also store them as pictures, export them wirelessly to a cloud service, etc. Battery life varies.You can install various handwriting apps, so you have a good chance of finding what you need. Standard capacitive screens (Ipad, Galaxy Tab) won't do.
2. Monochrome LCD tablets. These are rare but designed specifically for note-taking. I use the Asus EeeNote EA800 daily and can highly recommend it. There is no light, and the screen has less contrast than e-ink, but the software is great. It's also much cheaper than a full-on tablet. The aforementioned Sharp WG- N20 also belongs in this category.
3. Some e-ink readers also have electromagnetic screens. Current devices include some (not all) Onyx and Hanvon models. Discontinued devices include the Irex Iliad, the DR800, and the DR1000S.
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