Nominal screen size is not the active area: pixel density of e-readers under 5 inches, 2026
Year: 2026
Type: article
Abstract: E-reader screens are sold by a rounded diagonal, in inches. Pixel density, in pixels per inch (PPI), is a property of the active area, the rectangle that contains the pixels. Dividing a pixel count by the nominal inch size therefore answers a different question from the one the PPI figure claims to answer. This note gives the method, applies it to the one pocket-reader panel in the set whose pitch and active area are published, and then back-calculates the active-area diagonal implied by other makers' published resolution and PPI. For IKAWE Moov Pro the pitch is 0.08467 mm, the active area is 58.25 × 96.86 mm (4.450 inches on the diagonal), and both routes give 299.99 PPI(~300PPI). Dividing the same pixels by the nominal 4.5 inches gives 296.7 PPI. A sourced specification table of e-readers under 5 inches is included. IKAWE makes Moov. Competitor figures are taken from makers' pages and the cited reports. No competing device was measured for this note.
Author: Olad, Baz
Language: English
Subfield: Library and Information Sciences
Field: Social Sciences
Domain: Social Sciences
Open Access status: green
OpenAlex ID: W7225770182
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