Seiko prototype viewer terminal using electronic paper
Seiko prototype viewer terminal measures 180 x 120mm, which is about the size of a notebook (B6 size). It is only 3mm thick and only weighs 57g. It is equipped with an USB port for USB-based data exchange. The display unit is equipped with a 6.7-inch screen with a resolution of 1200 x 1600. The screen features a definition of about 300ppi, contrast ration of 8:1 and reflectivity of 43%. The glass substrate was made thin to achieve product’s slim profile and light weightness. Although the original glass substrate on which the TFT is formed has a thickness of 0.5mm, it is cut to 0.2mm by etching.
The Seiko prototype viewer terminal is driven by a button cell (CR1220). The screen can be redrawn for 1,420 times with one button cell because the electronic paper consumes power only when the display is redrawn. The time required for redrawing is 0.7 seconds. While the Seiko Epson’s existing e-paper takes 5 seconds to redraw the screen, the company enhanced the redraw speed by improving the drive circuit, etc