A simple shift register circuit for depletion-mode oxide TFTs
► Metal-oxide TFTs operate as n-channel FET but tend to have negative VT. ► A shift register circuit for the depletion-mode oxide TFT is required. ► Two different low levels of clock signals in the circuit can resolve the problem. ► New shift register circuit composed of only 6 TFTs operates over VT...
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| Veröffentlicht in: | Solid-state electronics 2013-01, Vol.79, p.2-6 |
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| container_title | Solid-state electronics |
| container_volume | 79 |
| creator | Pi, Jae-Eun Ryu, Min Ki Hwang, Chi-Sun Park, Sang-Hee Ko Yoon, Sung-Min Lym, HongKyun Kim, YeonKyung Oh, HwanSool Park, KeeChan |
| description | ► Metal-oxide TFTs operate as n-channel FET but tend to have negative VT. ► A shift register circuit for the depletion-mode oxide TFT is required. ► Two different low levels of clock signals in the circuit can resolve the problem. ► New shift register circuit composed of only 6 TFTs operates over VT range −5–+9V according to simulation. ► Fabricated circuit with depletion-mode IGZO TFTs also works successfully.
We report the simplest shift register circuit compatible with metal-oxide thin-film transistors (TFTs). Since the oxide TFT often exhibits depletion-mode characteristic, it is impossible to guarantee stable operation of the shift register when we resort to conventional circuit scheme. In order to resolve this problem, we employed two different low-voltage levels for the clock signals. As a result, we could turn off the depletion-mode oxide TFTs completely with sufficient voltage margin. According to the simulation results, the new shift register composed of only 6 TFTs operates properly over the threshold voltage (VT) range of −5–+9V. The fabricated circuit also worked successfully even though VT of the TFTs ranged from −5V to −3V. |
| doi_str_mv | 10.1016/j.sse.2012.07.002 |
| format | Article |
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We report the simplest shift register circuit compatible with metal-oxide thin-film transistors (TFTs). Since the oxide TFT often exhibits depletion-mode characteristic, it is impossible to guarantee stable operation of the shift register when we resort to conventional circuit scheme. In order to resolve this problem, we employed two different low-voltage levels for the clock signals. As a result, we could turn off the depletion-mode oxide TFTs completely with sufficient voltage margin. According to the simulation results, the new shift register composed of only 6 TFTs operates properly over the threshold voltage (VT) range of −5–+9V. The fabricated circuit also worked successfully even though VT of the TFTs ranged from −5V to −3V.</description><identifier>ISSN: 0038-1101</identifier><identifier>EISSN: 1879-2405</identifier><identifier>DOI: 10.1016/j.sse.2012.07.002</identifier><language>eng</language><publisher>Kidlington: Elsevier Ltd</publisher><subject>Applied sciences ; Circuit properties ; Circuits ; Depletion ; Depletion-mode ; Digital circuits ; Electric, optical and optoelectronic circuits ; Electronic circuits ; Electronics ; Exact sciences and technology ; Metal oxides ; Oxide TFTs ; Oxides ; Semiconductor devices ; Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices ; Shift register ; Shift registers ; Thin film transistors ; Transistors ; Voltage</subject><ispartof>Solid-state electronics, 2013-01, Vol.79, p.2-6</ispartof><rights>2012 Elsevier Ltd</rights><rights>2014 INIST-CNRS</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c393t-95a8081ae87c363b4b512e4d7a44c7d415365eac30e34b6c312d99810ab268fc3</citedby><cites>FETCH-LOGICAL-c393t-95a8081ae87c363b4b512e4d7a44c7d415365eac30e34b6c312d99810ab268fc3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://www.sciencedirect.com/science/article/pii/S003811011200233X$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,776,780,3537,27901,27902,65306</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=26680185$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>Pi, Jae-Eun</creatorcontrib><creatorcontrib>Ryu, Min Ki</creatorcontrib><creatorcontrib>Hwang, Chi-Sun</creatorcontrib><creatorcontrib>Park, Sang-Hee Ko</creatorcontrib><creatorcontrib>Yoon, Sung-Min</creatorcontrib><creatorcontrib>Lym, HongKyun</creatorcontrib><creatorcontrib>Kim, YeonKyung</creatorcontrib><creatorcontrib>Oh, HwanSool</creatorcontrib><creatorcontrib>Park, KeeChan</creatorcontrib><title>A simple shift register circuit for depletion-mode oxide TFTs</title><title>Solid-state electronics</title><description>► Metal-oxide TFTs operate as n-channel FET but tend to have negative VT. ► A shift register circuit for the depletion-mode oxide TFT is required. ► Two different low levels of clock signals in the circuit can resolve the problem. ► New shift register circuit composed of only 6 TFTs operates over VT range −5–+9V according to simulation. ► Fabricated circuit with depletion-mode IGZO TFTs also works successfully.
We report the simplest shift register circuit compatible with metal-oxide thin-film transistors (TFTs). Since the oxide TFT often exhibits depletion-mode characteristic, it is impossible to guarantee stable operation of the shift register when we resort to conventional circuit scheme. In order to resolve this problem, we employed two different low-voltage levels for the clock signals. As a result, we could turn off the depletion-mode oxide TFTs completely with sufficient voltage margin. According to the simulation results, the new shift register composed of only 6 TFTs operates properly over the threshold voltage (VT) range of −5–+9V. The fabricated circuit also worked successfully even though VT of the TFTs ranged from −5V to −3V.</description><subject>Applied sciences</subject><subject>Circuit properties</subject><subject>Circuits</subject><subject>Depletion</subject><subject>Depletion-mode</subject><subject>Digital circuits</subject><subject>Electric, optical and optoelectronic circuits</subject><subject>Electronic circuits</subject><subject>Electronics</subject><subject>Exact sciences and technology</subject><subject>Metal oxides</subject><subject>Oxide TFTs</subject><subject>Oxides</subject><subject>Semiconductor devices</subject><subject>Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices</subject><subject>Shift register</subject><subject>Shift registers</subject><subject>Thin film transistors</subject><subject>Transistors</subject><subject>Voltage</subject><issn>0038-1101</issn><issn>1879-2405</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2013</creationdate><recordtype>article</recordtype><recordid>eNp9kE1Lw0AQhhdRsFZ_gLdcBC-JM7v52CAeSrEqFLzU87LdTHRL2tSdVPTfu6XFo5eZy_O-wzxCXCNkCFjerTJmyiSgzKDKAOSJGKGu6lTmUJyKEYDSKUb0XFwwryASJcJIPEwS9uttRwl_-HZIAr17Higkzge380PS9iFpKAKD7zfpum8o6b99nIvZgi_FWWs7pqvjHou32eNi-pzOX59eppN56lSthrQurAaNlnTlVKmW-bJASXlT2Tx3VZNjocqCrFNAKl-WTqFs6loj2KUsdevUWNweereh_9wRD2bt2VHX2Q31OzYodWyolMKI4gF1oWcO1Jpt8GsbfgyC2asyKxNVmb0qA5WJImLm5lhv2dmuDXbjPP8FZVlqQF1E7v7AUfz1y1Mw7DxtHDU-kBtM0_t_rvwCRbN8vA</recordid><startdate>20130101</startdate><enddate>20130101</enddate><creator>Pi, Jae-Eun</creator><creator>Ryu, Min Ki</creator><creator>Hwang, Chi-Sun</creator><creator>Park, Sang-Hee Ko</creator><creator>Yoon, Sung-Min</creator><creator>Lym, HongKyun</creator><creator>Kim, YeonKyung</creator><creator>Oh, HwanSool</creator><creator>Park, KeeChan</creator><general>Elsevier Ltd</general><general>Elsevier</general><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7SP</scope><scope>7U5</scope><scope>8FD</scope><scope>H8D</scope><scope>L7M</scope></search><sort><creationdate>20130101</creationdate><title>A simple shift register circuit for depletion-mode oxide TFTs</title><author>Pi, Jae-Eun ; Ryu, Min Ki ; Hwang, Chi-Sun ; Park, Sang-Hee Ko ; Yoon, Sung-Min ; Lym, HongKyun ; Kim, YeonKyung ; Oh, HwanSool ; Park, KeeChan</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c393t-95a8081ae87c363b4b512e4d7a44c7d415365eac30e34b6c312d99810ab268fc3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2013</creationdate><topic>Applied sciences</topic><topic>Circuit properties</topic><topic>Circuits</topic><topic>Depletion</topic><topic>Depletion-mode</topic><topic>Digital circuits</topic><topic>Electric, optical and optoelectronic circuits</topic><topic>Electronic circuits</topic><topic>Electronics</topic><topic>Exact sciences and technology</topic><topic>Metal oxides</topic><topic>Oxide TFTs</topic><topic>Oxides</topic><topic>Semiconductor devices</topic><topic>Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices</topic><topic>Shift register</topic><topic>Shift registers</topic><topic>Thin film transistors</topic><topic>Transistors</topic><topic>Voltage</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Pi, Jae-Eun</creatorcontrib><creatorcontrib>Ryu, Min Ki</creatorcontrib><creatorcontrib>Hwang, Chi-Sun</creatorcontrib><creatorcontrib>Park, Sang-Hee Ko</creatorcontrib><creatorcontrib>Yoon, Sung-Min</creatorcontrib><creatorcontrib>Lym, HongKyun</creatorcontrib><creatorcontrib>Kim, YeonKyung</creatorcontrib><creatorcontrib>Oh, HwanSool</creatorcontrib><creatorcontrib>Park, KeeChan</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Electronics & Communications Abstracts</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Solid-state electronics</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Pi, Jae-Eun</au><au>Ryu, Min Ki</au><au>Hwang, Chi-Sun</au><au>Park, Sang-Hee Ko</au><au>Yoon, Sung-Min</au><au>Lym, HongKyun</au><au>Kim, YeonKyung</au><au>Oh, HwanSool</au><au>Park, KeeChan</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>A simple shift register circuit for depletion-mode oxide TFTs</atitle><jtitle>Solid-state electronics</jtitle><date>2013-01-01</date><risdate>2013</risdate><volume>79</volume><spage>2</spage><epage>6</epage><pages>2-6</pages><issn>0038-1101</issn><eissn>1879-2405</eissn><abstract>► Metal-oxide TFTs operate as n-channel FET but tend to have negative VT. ► A shift register circuit for the depletion-mode oxide TFT is required. ► Two different low levels of clock signals in the circuit can resolve the problem. ► New shift register circuit composed of only 6 TFTs operates over VT range −5–+9V according to simulation. ► Fabricated circuit with depletion-mode IGZO TFTs also works successfully.
We report the simplest shift register circuit compatible with metal-oxide thin-film transistors (TFTs). Since the oxide TFT often exhibits depletion-mode characteristic, it is impossible to guarantee stable operation of the shift register when we resort to conventional circuit scheme. In order to resolve this problem, we employed two different low-voltage levels for the clock signals. As a result, we could turn off the depletion-mode oxide TFTs completely with sufficient voltage margin. According to the simulation results, the new shift register composed of only 6 TFTs operates properly over the threshold voltage (VT) range of −5–+9V. The fabricated circuit also worked successfully even though VT of the TFTs ranged from −5V to −3V.</abstract><cop>Kidlington</cop><pub>Elsevier Ltd</pub><doi>10.1016/j.sse.2012.07.002</doi><tpages>5</tpages></addata></record> |
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| subjects | Applied sciences Circuit properties Circuits Depletion Depletion-mode Digital circuits Electric, optical and optoelectronic circuits Electronic circuits Electronics Exact sciences and technology Metal oxides Oxide TFTs Oxides Semiconductor devices Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices Shift register Shift registers Thin film transistors Transistors Voltage |
| title | A simple shift register circuit for depletion-mode oxide TFTs |
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