changeset 135:5dc2cfe8912c

Choosing tablet for reading.
author Oleksandr Gavenko <gavenkoa@gmail.com>
date Thu, 12 Oct 2017 20:27:24 +0300
parents 17625980ea3d
children e365ee7f9632
files cc0a1d76-d0c3-4282-b548-21786d5cc8aa/index.rst
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+=============================
+ Choosing tablet for reading
+=============================
+:created: 2017-10-12 18:00
+:updated: 2017-10-12
+:tags: hardware
+
+I need to read a lot and reading from PC or laptop screen is not a pleasure if you are in a bed ))
+
+I want device that will replaces paper books and that will be as good as paper or better ))
+
+As a reader you may face small size of text on screen.
+
+If you look to books sizes they are usually 10" or 11" and has dimension ratio 1.2-1.5, with most
+common is 1.42 (which is √2 - A series papar size ratio).
+
+It's better to have near the same ratio for tablet screen to efficiently reuse all available space.
+
+I had N101 II tablet with 10.1" screen size and 1280 x 800px resolution. Screen ratio is::
+
+  1280/800 = 8/5 = 1.6
+
+In portrait mode with full page on screen top and bottom space are wasted as screen is too narrow.
+
+Full HD resolution has worse ratio::
+
+  1920/1080 = 16/9 = 1.78
+
+but there are usually additional pixels for menu (like in Samsung Galaxy Tab A 10.1)::
+
+  1920/1200 = 8/5 = 1.6
+
+There is Samsung Galaxy Tab S2 9.7 that has ratio::
+
+  2048/1536 = 4/3 = 1.33
+
+It is much closer to book ratio and provides more space for text in portrait mode that is usual for
+books.
+
+Another parameter is DPI - how precisely screen can represents details. Usual print material has at
+least 300 DPI for inkjet printers and 600 DPI for laser printers.
+
+CRT PC/Windows monitors has standard of 96 PPI and Apple monitors has 72 PPI. But those numbers
+slightly increased with LCD monitors have come to play.
+
+My old tablet has such DPI::
+
+  10.1" / √(1280² + 800²) = 150 DPI
+
+Samsung Galaxy Tab A 10.1 has::
+
+  10.1" / √(1920² + 1080²) = 218 DPI
+
+Samsung Galaxy Tab S2 9.7 has::
+
+  9.7" / √(2048² + 1536²) = 263 DPI
+
+So've I chosen to buy Galaxy Tab S2 9.7 for reading because of DPI and more appropriate size ratio.
+Even though it has a bit smaller screen it is wider and it's better for displaying details.
+