Table 1.

Physical properties of LE devices tested.

	Kindle Paperwhite (1st generation B020)	iPhone 5S (A1453)	iPad Air (A1474)
Screen diagonal (inches)	6	4	9.7
Pixel per inch	212	326	264
Technology	E Ink Carta/LED frontlit	LED-backlit with IPS Technology	LED-Backlit with IGZO technology
Distance measured (cm)	35	22.5	35

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