The world’s largest-screen flexible color e-paper

Toppan Printing Co Ltd developed a prototype of a 32-inch flexible color electronic paper (e-paper) in cooperation with E Ink Holdings Inc.

According to Toppan Printing, it is the world’s largest-screen flexible color e-paper that uses one driving TFT substrate (back plate). The company and E Ink will continue to co-develop technologies for the e-paper, aiming to commercialize it by the end of 2017.

The display panel of the prototype was manufactured by E Ink. It consists of the “E Ink Pearl” (a front plate for color display) and the “Mobius” (a back plate using a flexible base material for high-resolution display).

Though it is difficult to form color filters on the flexible back plate with a high positional accuracy due to the characteristics of the material, Toppan Printing solved this issue. Moreover, by developing a color filter optimized for the display properties of reflective e-paper, it became possible to reproduce brighter color tones.

The prototype has a screen size of 691.2 x 388.8mm (32 inches), a color filter of RGBW square pattern, a pixel count of 1,280 x 720 (the number of sub-pixels of the back plate: 2,560 x 1,440), a pixel pitch of 540μm and a contrast ratio of 10-20:1 (representative value). It can display 4,096 colors.

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