US A1 (19) United States (12) Patent Application Publication (10) Pub. No.: US 2003/ A1. Laboratory. obo Dbl obz. Dbn.

Transcription

1 US A1 (19) United States (12) Patent Application Publication (10) Pub. No.: US 2003/ A1 Nagao (43) Pub. Date: May 15, 2003 (54) (75) (73) (21) (22) (63) D/A CONVERSION CIRCUIT AND SEMICONDUCTOR DEVICE Inventor: Shou Nagao, Kanagawa (JP) Correspondence Address: Edward D. Manzo Cook, Alex, McFarron, Manzo, Cummings & Mehler, Ltd. 200 West Adams St., Ste Chicago, IL (US) Assignee: Semiconductor Energy Co., Ltd. Appl. No.: 10/290,954 Filed: Nov. 8, 2002 Related U.S. Application Data Laboratory Continuation of application No. 10/ 100,355,?led on Mar. 18, 2002, now Pat. No. 6,496,130, which is a continuation of application No. 09/571,612,?led on May 15, 2000, now Pat. No. 6,380,876. (30) Foreign Application Priority Data May 17, 1999 (JP) Publication Classi?cation (51) Int. Cl H03M 1/78 (52) U.S. Cl /154 (57) ABSTRACT ADAC whose area is held down and a semiconductor device using the DAC are fabricated. A D/A conversion circuit is disclosed, including n resistors A0, A1,... An_1, n resistors B0, B1,..., Bn_1, two power-supply voltage lines, a power-supply voltage line L and a power-supply voltage line H, maintained at potentials different from each other, n switches SWaO, SWa1,..., SWan_1, n switches SWbO, SWb1,..., SWbn_1, and an output line, wherein, by n-bit digital signals inputted from the outside, said n switches SWaO, SWa1,..., SWan_1 and said n switches SWbO, SWb1,..., SWbn_1 are controlled, and, from the output line, an analog gradation voltage signal is outputted. VH POWER - SU PPLY VOLTAGE LINE H POWER- SUPPLY VOLTAGE LINE L VL obo Dbl obz. Dbn SWbl swtizm SWbn-I 80 BI B2 Bo-4 VOUT A2 An-l OUTPUT LINE swqg swon- D00 Dul D02 Dun-l

2 Patent Application Publication May 15, 2003 Sheet 1 0f 21 US 2003/ A1 VH obo Dbl IDbZ Dbn-l SWbO SWbl SWbZ SWbn-l POWER-SUPPLY VOLTAGE LINE H 80 BI B2 Bn-l g POWER- SUPPLY _ - VOUT VOLTAGE LINE L A2 An-l Ewgur swoz Swan-l VL - " ' D00 Dul D02 Dun-I F I G B obo Dbl 0b2 Dbn-l POWER-SUPPLY VOLTAGE LINE H VH - - ' v0 UT POWER-SUPPLY A0 Al A2 An-l OUTPUT VOLTAGE LIN E L LINE B2 SWGOASWOI 4L swgg Bn-l' Aswan-l W T Y " 1 D00 DGI D02 Dcm-l POWER- SUPPLY VOLTAGE LINE H POWER- SUPPLY VOLTAGE LINE L VL FIGIDV POWER SUPPLY VOLTAGE LINE H POWER-SUPPLY VOLTAGE LINE L VL D00 Dql 002 Don-l VOUT An-l? butput LINE

3 Patent Application Publication May 15, 2003 Sheet 2 0f 21 US 2003/ A1 D FIGZAV [Ibo Db. i EDI, H II 4 SWbOY SWbl swbz swbs POWER- SUPPLY 80 8 B2 B3 VOLTAGE LINE H KW A3 OUTPUT VOUT POWER- SUPPLY A0 A. A2 VOLTAGE LINE L LINE swao SWO SW02 SW03 "L T I D00 D0l D02 D03 FIGZB DbO Db. m DIG VH $ il Ti swbo SWbl swbz swb3 POWER- SUPPLY VOLTAGE LINEH '30 B B2 B3 04 VOUT POWER- SUPPLY ' OUTPUT VOLTAGE LINEL A0 A A2 A3 LUNE V SW00 SWO SW02 SW03 '- I 1 D00 D0l D02 D03 F l G _ DbO Dbl DbZ Db?) V L i " swbo SWbl T swbzi swbs POWER- SUPPLY VOLTAGE LINE H B0 8' B2 B3 '7 VOUT POWER- SUPPLY V OUTPUT VOLTAGE LINE L A0 Al A2 A3 LINE v SW00 SW0! SW02 SW03 L L I I I D00 DOI D02 D03 POWER - SUPPLY VH 0 DbO Dbl Db2 Db3 SW 0 SWbl SWbZ SWb3 VOLTAGE LINE H BO Bl 82 '33 Y Y Y Y Y VQLIT POWER- SUPPLY \\ VOLTAGE LINE L A0 AI A2 A3 output ~ SW00 SWO SW02 SW03 LINE VL * f D00 D0l D027 D037

4 Patent Application Publication May 15, 2003 Sheet 3 0f 21 US 2003/ A1 FIGB 30! - SOURCE LINE DRIVING CIRCUITA CK,SP 30l-l DIGITAL SIGNALS \ 7 30l 2 & ) LATCH 30M SIGNALS SELECT i ; signals 30 i 7 VH VL V 3Q _5 REsA, RESB \ ) SELECT signals L6 [30 T gig'ggts DIGTAL GATE VIDEO I slig'iluél DATA /LDR.VING CK CIRCUIT RES PIXEL PORTION \ DIGITAL / SOURCE LINE DRIVING CIRCUITB signals

5 Patent Application Publication May 15, 2003 Sheet 4 0f 21 US 2003/ A1 FIG4 POWER-SUPPLY BO Bl B2 B3 VOLTAGE LINE H POW ER-SUPPLY VOLTAGE LINE L VL Fl G_ 5 A v SWbl SWbZ SWb3 \ VOUT swol SW02 SW03 EILJEPUT POWER-SUPPLY \jo LTAGE LINE H Al A2 A3 H l. swbo I, \/ I \/ SWbl \\ll/ /r \\QI,' INVERTER P 4>" " *> VOUT VL lno \ SWCIO SWOI PO(WER SUPPLY VOLTAGE LINE L lnl Fl 5 B,,gctP-CHANNEL TFT VIN : = ' VOUT _ \ \/N-CHANNEL TFT

6 Patent Application Publication May 15, 2003 Sheet 5 0f 21 US 2003/ Al F I 6 OUTPUT LINE I N-CHANNEL TFT P-CHANNEL TFT \ \ INVERTED / DIGITAL $ GNAL _I\ _-> / < DIGITAL SIGNAL POWER SUPPLY VOLTAGE LINE FIG.7 CHANNEL FORMING REGION GATE E LECTRODE ACTIVE LAYER w / DRAIN REGION am mu DUUHM: 7 REGION

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10 Patent Application Publication May 15, 2003 Sheet 9 0f 21 US 2003/ A1 TRANSMITTANCE (u.u.) A "08 l - l O APPLIED VOLTAGE (V)

11 Patent Application Publication May 15, 2003 Sheet 10 0f 21 US 2003/ A1 FIGIZA ZOOI lO6 H6125 F'G'z'gczzos FIG. IZD 230l 2303 if 230 ' FIGIZF E \.

12 Patent Application Publication May 15, 2003 Sheet 11 0f 21 US 2003/ A1 FIG. IBA * FIG. I / / / / 260i / // W //// ' 1 l 2702 // 2704 Fl (3. IBC SCREEN O FIGBD /// //

13 Patent Application Publication May 15, 2003 Sheet 12 0f 21 US 2003/ A1 \\\\\\ i902 /903 I --SCREEN 2904 \\\\\\\\\ SCREEN SCREEN 2299 ms 99 MI 22

14 Patent Application Publication May 15, 2003 Sheet 13 0f 21 US 2003/ A1 PRIOR ART I408

15 Patent Application Publication May 15, 2003 Sheet 14 0f 21 US 2003/ A1 FIG-.I6 PRIOR ART Fl 7mm ART SOURCE SIGNAL LINE SW SW SW SW SW SW SW SW SW SW SW SW SW SW SW SW IO SOURCE SIGNAL LINE

16 Patent Application Publication May 15, 2003 Sheet 15 0f 21 US 2003/ A1 FIGISA FIG. I88 4 3:03 4 [4304 A 4367 \ L 1 _ A i

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18 Patent Application Publication May 15, 2003 Sheet 17 0f 21 US 2003/ A1 FIGZOA 4403 FIGZGB if: 441?, 4406 a bug? 44m; 44m,

19 Patent Application Publication May 15, 2003 Sheet 18 0f 21 US 2003/ A1 ~\\\\\\\\\\\\ ///// / 00$? no? No? Que \LW mwmv momw 4? 7,7474 7/ 5% _ J \llllj if ~03.02» 59E

20 A Patent Application Publication May 15, 2003 Sheet 19 0f 21 US 2003/ A1 FIG. 22A 1 I 460! / it v 4604 FIGZZB T4 U LXLI m 460$ Fl G. 22 C wit-a??? l U T 4603b

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