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Compact and power‐saving polysilicon data driver with common‐decoder DA converter (CD‐DAC)
Author(s) -
Kageyama Hiroshi,
Miyamoto Mitsuhide,
Akimoto Hajime,
Nishitani Shigeyuki,
Sato Toshihiro,
Miyazawa Toshio
Publication year - 2006
Publication title -
journal of the society for information display
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.578
H-Index - 52
eISSN - 1938-3657
pISSN - 1071-0922
DOI - 10.1889/1.2196510
Subject(s) - amoled , liquid crystal display , computer science , active matrix , driver circuit , electronic circuit , voltage , electrical engineering , computer hardware , power (physics) , electronic engineering , materials science , engineering , thin film transistor , physics , layer (electronics) , quantum mechanics , composite material , operating system
— A common‐decoder architecture for a data‐driver circuit fabricated by using a polysilicon process has been developed. The architecture achieves a compact circuit and low‐power consumption. In application to an integrated polysilicon data driver for small‐sized displays, this architecture reduces the area of the data driver by removing the vertical bus lines that occupy a large area. It also suppresses the power consumption of the data bus by reducing the number of driven lines in the data bus during word‐to‐word transitions from six to two. By using a conventional 4‐μm design rule, we fabricated an active‐matrix OLED (AMOLED) panel with an integrated six‐bit data‐driver circuit with 384 outputs. The driver circuit had a height of 2.6 mm and a pitch between output lines of 84 μm. The maximum power consumption of the driver was only 5 mW, i.e. , 3.8 mW for logic‐data transfer and 1.2 mW for reference‐voltage source. Furthermore, we also fabricated an active‐matrix LCD (AMLCD) panel including driver circuits of the same type as the integrated elements. Six‐bit full‐color images were successfully displayed on both panels.