MobileRead Forums - View Single Post

MGlitch · 06-07-2016, 02:39 PM

Scrolling can work on e-ink, but you'd still use up the battery faster or make it so the difference between scrolling and paging was moot.

Eink only really draws power when the screen refreshes, which it would need to every time you scroll. So lets say you read 10 lines of text and then scroll and repeat. My H2O has about 31 lines of text, however I use what most would consider faily small font size, and I've made my line spacing and margins optimized for getting the most lines per screen, so lets call it 25 lines. To read the same amount of text, you're refreshing the screen 2.5x as much as I am.

The issue isn't about smooth scrolling, though if it were -true- scrolling where you bring a line up and each part of that line must pass through every pixel between point a and b, then you're looking at even more battery drain. My thoughts are for a scrolling system that moves the text in chunks, so you have lines 1-10, when you scroll line 1 goes away and line 2 takes its place as a block of text.

As to scrolling on LCD, I can't say. I don't read books on my iPhone, nor any tablet I've used. I dislike using LCD for extended reading.

06-07-2016, 02:39 PM	#16
MGlitch Wizard Posts: 2,857 Karma: 22003124 Join Date: Aug 2014 Device: Kobo Forma, Kobo Sage, Kobo Libra 2	Scrolling can work on e-ink, but you'd still use up the battery faster or make it so the difference between scrolling and paging was moot. Eink only really draws power when the screen refreshes, which it would need to every time you scroll. So lets say you read 10 lines of text and then scroll and repeat. My H2O has about 31 lines of text, however I use what most would consider faily small font size, and I've made my line spacing and margins optimized for getting the most lines per screen, so lets call it 25 lines. To read the same amount of text, you're refreshing the screen 2.5x as much as I am. The issue isn't about smooth scrolling, though if it were -true- scrolling where you bring a line up and each part of that line must pass through every pixel between point a and b, then you're looking at even more battery drain. My thoughts are for a scrolling system that moves the text in chunks, so you have lines 1-10, when you scroll line 1 goes away and line 2 takes its place as a block of text. As to scrolling on LCD, I can't say. I don't read books on my iPhone, nor any tablet I've used. I dislike using LCD for extended reading. Last edited by MGlitch; 06-07-2016 at 02:45 PM.