Title :
Ferroelectric liquid-crystal shutter array with a-Si:H TFT driver
Author :
Okumura, Fujio ; Sera, Kenji ; Asada, Hideki ; Kaneko, Setsuo ; Ichinose, Hideo ; Tanaka, Koichi ; Yokoi, Takahiro ; Tani, Chizuka
Author_Institution :
NEC Corp., Kawasaki, Japan
fDate :
10/1/1990 12:00:00 AM
Abstract :
A ferroelectric liquid crystal (FLC) shutter array with an a-Si:H thin-film transistor (TFT) drive, designed for a low-cost and high-performance optical printing head, is presented. The a-Si:H TFT driver consists of inverter circuits, switch TFTs, and matrix circuits. A block driving method was employed to compensate for the low operating speed of the a-Si:H TFTs. The 256-dot, 300-dot/in resolution prototype device mounted in a printing head shows an over-30 contrast ratio and an 8-page/min operating speed. Additional measurements on this device demonstrate the possibility of operation with a 24-page/min speed at a 600 dot/in resolution
Keywords :
amorphous semiconductors; driver circuits; elemental semiconductors; ferroelectric devices; ferroelectric liquid crystals; hydrogen; liquid crystal devices; printers; silicon; thin film transistors; Si:H; TFT driver; block driving method; contrast ratio; ferroelectric liquid-crystal shutter array; high resolution; high speed operation; high-performance optical printing head; inverter circuits; low-cost; matrix circuits; operating speed; prototype device; resolution; switch TFTs; Driver circuits; Ferroelectric materials; Inverters; Liquid crystals; Optical arrays; Optical design; Optical switches; Printing; Switching circuits; Thin film transistors;
Journal_Title :
Electron Devices, IEEE Transactions on
