This isn’t just an e-reader but also a remarkable / scribe style tablet. It doesn’t affect writing on the rest of the page nor does it affect reading as the text displays fine. It is only when using the pen and writing in the area between the two lines (as shown on the image).
The Sony DPT-RP1 Digital Paper 13.3" A4 e-Ink Tablet would be best suited for individuals looking for an affordable, high-resolution e-reader for e-books and other electronic documents.
