Analog buffer circuit, display device and portable terminal

Details Analog buffer circuit, display device and portable terminal Analog buffer circuit, display device and portable terminal

2008-07-29

2008-07-29

Hjerpe, Richard (Department: 2629)

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

C345S204000

Reexamination Certificate

active

07405720

ABSTRACT:
An analog buffer circuit which has small input and output offsets and reduced power consumption even if it is formed on an insulating substrate by TFTs, a display device which uses the analog buffer circuit as a peripheral driving circuit for a display unit, and a portable terminal in which the display device is provided as a screen display unit are provided. By performing offset detection on a source follower in such a manner that, for example, two capacitors Cn1and Cn2are connected to the gate of a NMOS transistor Qn11as a source follower, and conduction
onconduction control of switches Sn1to Sn5are performed, if needed, and by sequentially canceling the detected offsets, a final offset voltage is sufficiently reduced and high precision offset cancellation is realized.

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