USO0RE40673E

(19) United States (12) Reissued Patent

(10) Patent Number: US RE40,673 E (45) Date of Reissued Patent: Mar. 24, 2009

Kanbara et a].

(54)

(56)

SHIFT REGISTER AND ELECTRONIC APPARATUS

References Cited U.S. PATENT DOCUMENTS

(75) Inventors: Minoru Kanbara, Hachioji (JP); Kazuhiro Sasaki, Sagamihara (JP); Katsuhiko MorosaWa, Higashiyamato

4,084,106 5,105,450 5,517,543 5,545,977 6,300,928 6,621,481

(JP) Assignee: Casio Computer Co., Ltd., Tokyo (JP) (73) (21) Appl. No .: 11/193,995 Jul. 29, 2005 (22) Filed: Related US. Patent Documents

6,611,248 Aug. 26, 2003 Appl. No.: 09/852,944 Filed: May 10, 2001 Foreign Application Priority Data (30) May 31, 2000

(JP)

Jun. 6, 2000

(JP)

Apr. 26, 2001 (JP) (51) Int. Cl. G11C 19/28 G11C 19/00

(52)

..................................... ..

2000-162671

2001-128909

A1 A1 B2 A B1

5/2000 11/1999 12/1993 7/1994 11/1999

Primary ExamineriAmare Mengistu Assistant ExamineriVincent E. Kovaick

(74) Attorney, Agent, or FirmiFrishauf, HoltZ, Goodman & Chick, PC.

(2006.01) (2006.01)

(57)

US. Cl. ........................ .. 345/100; 345/98; 345/204;

345/214; 345/205; 377/64; 377/68; 377/75; 377/58; 323/313; 323/314; 323/907; 327/542;

(58)

199 50 860 0 957 491 5-84967 06-202588 00242244

* cited by examiner

2000-169002 ..................................... ..

4/1978 Ullrich ...................... .. 377/ 79 4/1992 Yamada ..................... .. 377/58 5/1996 Schleupen et a1. .......... .. 377/ 79 8/1996 Yamada et a1. ............ .. 323/313 10/2001 Kim 9/2003 Kanbara

FOREIGN PATENT DOCUMENTS DE EP JP JP KR

Reissu e of: (64) Patent No.: Issued:

A A A A B1 B1

ABSTRACT

Each of stages RS(1), RS(2), . . . ofa shift register is consti

tuted by six TFTs. A ratio of a channel Width and a channel

length (W/L) of each of these TFTs 1 to 6 is set in accor

327/543

dance With a transistor characteristic of each TFT in such a

Field of Classi?cation Search .................. .. 345/98,

manner that the shift register normally operates for a long

345/99, 199, 204, 205, 214; 377/58, 64, 68, 377/70, 74, 75; 323/313; 327/542

time even at a high temperature.

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Shift register and electronic apparatus

Jul 29, 2005 - Kanbara et a]. (10) Patent Number: (45) Date of ... Schleupen et a1. .......... .. 377/ 79. Yamada et a1. ... CONTROLLER. N 1 50. Gcnt. Dcnt #data.

3MB Sizes 4 Downloads 68 Views

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