A New PWM Operational Scheme for MicroLED Displays Using Inverter and Dynamic SWEEP Signal Slope for Low Gray Level Expression
In this paper, we present a novel pulse width modulation (PWM) operational scheme for micro-light-emitting-diode ( \mu LED) displays using inverter and dynamic SWEEP signal slope. In the proposed PWM operational scheme, the slope of the SWEEP signal steepens as the gray level decreases. This adjusta...
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| Veröffentlicht in: | IEEE access 2023, Vol.11, p.135915-135921 |
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| creator | Kang, Kyeong-Soo Park, Ji-Hwan Park, Chanjin Lee, Ji-Ho Lee, Soo-Yeon |
| description | In this paper, we present a novel pulse width modulation (PWM) operational scheme for micro-light-emitting-diode ( \mu LED) displays using inverter and dynamic SWEEP signal slope. In the proposed PWM operational scheme, the slope of the SWEEP signal steepens as the gray level decreases. This adjustable SWEEP signal slope further shortens the falling time compared to the inverter-only strategy, leading to an exceptional capability to express extremely low gray levels. We implement the proposed scheme with a low-temperature poly-Si oxide (LTPO) thin-film transistor (TFT) pixel circuit and verify the operation through HSPICE based on measured TFT data. The simulation results show that the proposed scheme can significantly shorten the falling time to under \mu s level. The gray level of 14 G is accurately expressed without wavelength shift or pulse distortion, achieving a falling time of \mu s. In addition, we also verify the compensation accuracy of the pixel circuit, and the results indicate that the proposed pixel circuit can reliably compensate for TFT variations. |
| doi_str_mv | 10.1109/ACCESS.2023.3337889 |
| format | Article |
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In the proposed PWM operational scheme, the slope of the SWEEP signal steepens as the gray level decreases. This adjustable SWEEP signal slope further shortens the falling time compared to the inverter-only strategy, leading to an exceptional capability to express extremely low gray levels. We implement the proposed scheme with a low-temperature poly-Si oxide (LTPO) thin-film transistor (TFT) pixel circuit and verify the operation through HSPICE based on measured TFT data. The simulation results show that the proposed scheme can significantly shorten the falling time to under <inline-formula> <tex-math notation="LaTeX">\mu </tex-math></inline-formula>s level. The gray level of 14 G is accurately expressed without wavelength shift or pulse distortion, achieving a falling time of <inline-formula> <tex-math notation="LaTeX">\mu </tex-math></inline-formula>s. In addition, we also verify the compensation accuracy of the pixel circuit, and the results indicate that the proposed pixel circuit can reliably compensate for TFT variations.]]></description><identifier>ISSN: 2169-3536</identifier><identifier>EISSN: 2169-3536</identifier><identifier>DOI: 10.1109/ACCESS.2023.3337889</identifier><identifier>CODEN: IAECCG</identifier><language>eng</language><publisher>Piscataway: IEEE</publisher><subject>Circuits ; Displays ; falling time ; inverter ; Inverters ; Light emitting diodes ; low gray level ; Low temperature ; LTPO ; MicroLED ; pixel circuit ; Pixels ; Polysilicon ; Power demand ; Pulse duration modulation ; Pulse width modulation ; PWM ; Semiconductor devices ; Switches ; Switching circuits ; TFT ; Thin film transistors ; Threshold voltage</subject><ispartof>IEEE access, 2023, Vol.11, p.135915-135921</ispartof><rights>Copyright The Institute of Electrical and Electronics Engineers, Inc. (IEEE) 2023</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c409t-12d41730f0ea34138f2eddc1f2545e7ca92d7b51cb3ec41dc2bba4ac29f3d7763</citedby><cites>FETCH-LOGICAL-c409t-12d41730f0ea34138f2eddc1f2545e7ca92d7b51cb3ec41dc2bba4ac29f3d7763</cites><orcidid>0000-0001-7377-3838 ; 0009-0006-0367-0845 ; 0000-0001-7031-8813 ; 0000-0002-9822-2570</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://ieeexplore.ieee.org/document/10335670$$EHTML$$P50$$Gieee$$Hfree_for_read</linktohtml><link.rule.ids>315,782,786,866,2104,4026,27640,27930,27931,27932,54940</link.rule.ids></links><search><creatorcontrib>Kang, Kyeong-Soo</creatorcontrib><creatorcontrib>Park, Ji-Hwan</creatorcontrib><creatorcontrib>Park, Chanjin</creatorcontrib><creatorcontrib>Lee, Ji-Ho</creatorcontrib><creatorcontrib>Lee, Soo-Yeon</creatorcontrib><title>A New PWM Operational Scheme for MicroLED Displays Using Inverter and Dynamic SWEEP Signal Slope for Low Gray Level Expression</title><title>IEEE access</title><addtitle>Access</addtitle><description><![CDATA[In this paper, we present a novel pulse width modulation (PWM) operational scheme for micro-light-emitting-diode (<inline-formula> <tex-math notation="LaTeX">\mu </tex-math></inline-formula>LED) displays using inverter and dynamic SWEEP signal slope. In the proposed PWM operational scheme, the slope of the SWEEP signal steepens as the gray level decreases. This adjustable SWEEP signal slope further shortens the falling time compared to the inverter-only strategy, leading to an exceptional capability to express extremely low gray levels. We implement the proposed scheme with a low-temperature poly-Si oxide (LTPO) thin-film transistor (TFT) pixel circuit and verify the operation through HSPICE based on measured TFT data. The simulation results show that the proposed scheme can significantly shorten the falling time to under <inline-formula> <tex-math notation="LaTeX">\mu </tex-math></inline-formula>s level. The gray level of 14 G is accurately expressed without wavelength shift or pulse distortion, achieving a falling time of <inline-formula> <tex-math notation="LaTeX">\mu </tex-math></inline-formula>s. In addition, we also verify the compensation accuracy of the pixel circuit, and the results indicate that the proposed pixel circuit can reliably compensate for TFT variations.]]></description><subject>Circuits</subject><subject>Displays</subject><subject>falling time</subject><subject>inverter</subject><subject>Inverters</subject><subject>Light emitting diodes</subject><subject>low gray level</subject><subject>Low temperature</subject><subject>LTPO</subject><subject>MicroLED</subject><subject>pixel circuit</subject><subject>Pixels</subject><subject>Polysilicon</subject><subject>Power demand</subject><subject>Pulse duration modulation</subject><subject>Pulse width modulation</subject><subject>PWM</subject><subject>Semiconductor devices</subject><subject>Switches</subject><subject>Switching circuits</subject><subject>TFT</subject><subject>Thin film transistors</subject><subject>Threshold voltage</subject><issn>2169-3536</issn><issn>2169-3536</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2023</creationdate><recordtype>article</recordtype><sourceid>ESBDL</sourceid><sourceid>RIE</sourceid><sourceid>DOA</sourceid><recordid>eNpNkU1v2zAMho1hA1a0_QXbQcDOySRRtqxjkHhdAPcD8IoeBVmmMwWO5UnuRy777XPqYigvJAi-D0G-SfKF0SVjVH1frddFVS055bAEAJnn6kNyxlmmFpBC9vFd_Tm5jHFPp8inVirPkr8rcoPP5O7hmtwOGMzofG86UtnfeEDS-kCunQ2-LDZk4-LQmWMk99H1O7LtnzCMGIjpG7I59ubgLKkeiuKOVG73Cun8MDNK_0yugjmSEp-wI8XLEDDGadVF8qk1XcTLt3ye3P8ofq1_Lsrbq-16VS6soGpcMN4IJoG2FA0IBnnLsWksa3kqUpTWKN7IOmW2BrSCNZbXtRHGctVCI2UG58l25jbe7PUQ3MGEo_bG6deGDzttwuhshzoXFNGmVrUchGTGQKOQygmUYsZqPrG-zawh-D-PGEe9949hOjhqnislMpmz0xTMU9P3YgzY_t_KqD75pmff9Mk3_ebbpPo6qxwivlMApJmk8A-UyZOj</recordid><startdate>2023</startdate><enddate>2023</enddate><creator>Kang, Kyeong-Soo</creator><creator>Park, Ji-Hwan</creator><creator>Park, Chanjin</creator><creator>Lee, Ji-Ho</creator><creator>Lee, Soo-Yeon</creator><general>IEEE</general><general>The Institute of Electrical and Electronics Engineers, Inc. (IEEE)</general><scope>97E</scope><scope>ESBDL</scope><scope>RIA</scope><scope>RIE</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7SC</scope><scope>7SP</scope><scope>7SR</scope><scope>8BQ</scope><scope>8FD</scope><scope>JG9</scope><scope>JQ2</scope><scope>L7M</scope><scope>L~C</scope><scope>L~D</scope><scope>DOA</scope><orcidid>https://orcid.org/0000-0001-7377-3838</orcidid><orcidid>https://orcid.org/0009-0006-0367-0845</orcidid><orcidid>https://orcid.org/0000-0001-7031-8813</orcidid><orcidid>https://orcid.org/0000-0002-9822-2570</orcidid></search><sort><creationdate>2023</creationdate><title>A New PWM Operational Scheme for MicroLED Displays Using Inverter and Dynamic SWEEP Signal Slope for Low Gray Level Expression</title><author>Kang, Kyeong-Soo ; Park, Ji-Hwan ; Park, Chanjin ; Lee, Ji-Ho ; Lee, Soo-Yeon</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c409t-12d41730f0ea34138f2eddc1f2545e7ca92d7b51cb3ec41dc2bba4ac29f3d7763</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2023</creationdate><topic>Circuits</topic><topic>Displays</topic><topic>falling time</topic><topic>inverter</topic><topic>Inverters</topic><topic>Light emitting diodes</topic><topic>low gray level</topic><topic>Low temperature</topic><topic>LTPO</topic><topic>MicroLED</topic><topic>pixel circuit</topic><topic>Pixels</topic><topic>Polysilicon</topic><topic>Power demand</topic><topic>Pulse duration modulation</topic><topic>Pulse width modulation</topic><topic>PWM</topic><topic>Semiconductor devices</topic><topic>Switches</topic><topic>Switching circuits</topic><topic>TFT</topic><topic>Thin film transistors</topic><topic>Threshold voltage</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Kang, Kyeong-Soo</creatorcontrib><creatorcontrib>Park, Ji-Hwan</creatorcontrib><creatorcontrib>Park, Chanjin</creatorcontrib><creatorcontrib>Lee, Ji-Ho</creatorcontrib><creatorcontrib>Lee, Soo-Yeon</creatorcontrib><collection>IEEE All-Society Periodicals Package (ASPP) 2005-present</collection><collection>IEEE Open Access Journals</collection><collection>IEEE All-Society Periodicals Package (ASPP) 1998-Present</collection><collection>IEEE Electronic Library (IEL)</collection><collection>CrossRef</collection><collection>Computer and Information Systems Abstracts</collection><collection>Electronics & Communications Abstracts</collection><collection>Engineered Materials Abstracts</collection><collection>METADEX</collection><collection>Technology Research Database</collection><collection>Materials Research Database</collection><collection>ProQuest Computer Science Collection</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>Computer and Information Systems Abstracts Academic</collection><collection>Computer and Information Systems Abstracts Professional</collection><collection>DOAJ Directory of Open Access Journals</collection><jtitle>IEEE access</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Kang, Kyeong-Soo</au><au>Park, Ji-Hwan</au><au>Park, Chanjin</au><au>Lee, Ji-Ho</au><au>Lee, Soo-Yeon</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>A New PWM Operational Scheme for MicroLED Displays Using Inverter and Dynamic SWEEP Signal Slope for Low Gray Level Expression</atitle><jtitle>IEEE access</jtitle><stitle>Access</stitle><date>2023</date><risdate>2023</risdate><volume>11</volume><spage>135915</spage><epage>135921</epage><pages>135915-135921</pages><issn>2169-3536</issn><eissn>2169-3536</eissn><coden>IAECCG</coden><abstract><![CDATA[In this paper, we present a novel pulse width modulation (PWM) operational scheme for micro-light-emitting-diode (<inline-formula> <tex-math notation="LaTeX">\mu </tex-math></inline-formula>LED) displays using inverter and dynamic SWEEP signal slope. In the proposed PWM operational scheme, the slope of the SWEEP signal steepens as the gray level decreases. This adjustable SWEEP signal slope further shortens the falling time compared to the inverter-only strategy, leading to an exceptional capability to express extremely low gray levels. We implement the proposed scheme with a low-temperature poly-Si oxide (LTPO) thin-film transistor (TFT) pixel circuit and verify the operation through HSPICE based on measured TFT data. The simulation results show that the proposed scheme can significantly shorten the falling time to under <inline-formula> <tex-math notation="LaTeX">\mu </tex-math></inline-formula>s level. The gray level of 14 G is accurately expressed without wavelength shift or pulse distortion, achieving a falling time of <inline-formula> <tex-math notation="LaTeX">\mu </tex-math></inline-formula>s. In addition, we also verify the compensation accuracy of the pixel circuit, and the results indicate that the proposed pixel circuit can reliably compensate for TFT variations.]]></abstract><cop>Piscataway</cop><pub>IEEE</pub><doi>10.1109/ACCESS.2023.3337889</doi><tpages>7</tpages><orcidid>https://orcid.org/0000-0001-7377-3838</orcidid><orcidid>https://orcid.org/0009-0006-0367-0845</orcidid><orcidid>https://orcid.org/0000-0001-7031-8813</orcidid><orcidid>https://orcid.org/0000-0002-9822-2570</orcidid><oa>free_for_read</oa></addata></record> |
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| subjects | Circuits Displays falling time inverter Inverters Light emitting diodes low gray level Low temperature LTPO MicroLED pixel circuit Pixels Polysilicon Power demand Pulse duration modulation Pulse width modulation PWM Semiconductor devices Switches Switching circuits TFT Thin film transistors Threshold voltage |
| title | A New PWM Operational Scheme for MicroLED Displays Using Inverter and Dynamic SWEEP Signal Slope for Low Gray Level Expression |
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