Title :
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
fDate :
9/1/2002 12:00:00 AM
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;
Journal_Title :
Electron Devices, IEEE Transactions on
DOI :
10.1109/TED.2002.801432
