High-resolution microencapsulated electrophoretic display (EPD) driven by poly-si TFTs with four-level grayscale

Author

Inoue, Satoshi ; Kawai, Hideyuki ; Kanbe, Sadao ; Saeki, Takayuki ; Shimoda, Tatsuya

Author_Institution

Technol. Platform Res. Center, Seiko Epson Corp., Nagano, Japan

Volume

49

Issue

9

fYear

2002

fDate

9/1/2002 12:00:00 AM

Firstpage

1532

Lastpage

1539

Abstract

A high-resolution active-matrix microencapsulated electrophoretic display (EPD) driven by polycrystalline-silicon thin-film transistors (poly-Si TFTs) with integrated drivers has been developed for the first feasibility study of electronic paper. The poly-Si TFTs were fabricated with a low temperature process below 425°C. Microencapsulated electrophoretic material was coated on the TFT backplane, which was driven at 18 V. The resolution of the display is quarter VGA (video graphics array), and pixel pitch is 131 ppi (pixels per inch). As a result, this display offers a wide viewing angle, high contrast ratio and nonvolatilization of data. In addition, four-level grayscale images were also achieved by using an area ratio grayscale (ARG) driving method

Keywords

display devices; electrophoresis; elemental semiconductors; low-power electronics; silicon; thin film transistors; 18 V; 425 degC; Si; active-matrix display; area ratio grayscale driving method; contrast ratio; electronic paper; four-level grayscale images; high-resolution display; low temperature process; microencapsulated electrophoretic display; nonvolatilization; pixel pitch; polysilicon thin-film transistors; video graphics array; viewing angle; Active matrix technology; Backplanes; Displays; Driver circuits; Graphics; Gray-scale; Hyperspectral imaging; Indexes; Temperature; Thin film transistors;

fLanguage

English

Journal_Title

Electron Devices, IEEE Transactions on

Publisher

ieee

ISSN

0018-9383

Type

jour

DOI

10.1109/TED.2002.801432

Filename

1027833