Improvement in Brightness Uniformity by Compensating for the Threshold Voltages of Both the Driving Thin-Film Transistor and the Organic Light-Emitting Diode for Active-Matrix Organic Light-Emitting Diode Displays
This paper proposes a novel pixel circuit design and driving method for active-matrix organic light-emitting diode (AM-OLED) displays that use low-temperature polycrystalline-silicon thin-film transistors (LTPS-TFTs) as driving element. The automatic integrated circuit modeling simulation program wi...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2014-01-01
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| Series: | International Journal of Photoenergy |
| Online Access: | http://dx.doi.org/10.1155/2014/604286 |
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| _version_ | 1832550670514782208 |
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| author | Ching-Lin Fan Hao-Wei Chen Hui-Lung Lai Bo-Liang Guo Bohr-Ran Huang |
| author_facet | Ching-Lin Fan Hao-Wei Chen Hui-Lung Lai Bo-Liang Guo Bohr-Ran Huang |
| author_sort | Ching-Lin Fan |
| collection | DOAJ |
| description | This paper proposes a novel pixel circuit design and driving method for active-matrix organic light-emitting diode (AM-OLED) displays that use low-temperature polycrystalline-silicon thin-film transistors (LTPS-TFTs) as driving element. The automatic integrated circuit modeling simulation program with integrated circuit emphasis (AIM-SPICE) simulator was used to verify that the proposed pixel circuit, which comprises five transistors and one capacitor, can supply uniform output current. The voltage programming method of the proposed pixel circuit comprises three periods: reset, compensation with data input, and emission periods. The simulated results reflected excellent performance. For instance, when ΔVTH=±0.33 V, the average error rate of the OLED current variation was low (<0.8%), and when ΔVTH_OLED=+0.33 V, the error rate of the OLED current variation was 4.7%. Moreover, when the I×R (current × resistance) drop voltage of a power line was 0.3 V, the error rate of the OLED current variation was 5.8%. The simulated results indicated that the proposed pixel circuit exhibits high immunity to the threshold voltage deviation of both the driving poly-Si TFTs and OLEDs, and simultaneously compensates for the I×R drop voltage of a power line. |
| format | Article |
| id | doaj-art-04437bb7c38d42cbad3cd5fe9d07137b |
| institution | Kabale University |
| issn | 1110-662X 1687-529X |
| language | English |
| publishDate | 2014-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Photoenergy |
| spelling | doaj-art-04437bb7c38d42cbad3cd5fe9d07137b2025-02-03T06:06:00ZengWileyInternational Journal of Photoenergy1110-662X1687-529X2014-01-01201410.1155/2014/604286604286Improvement in Brightness Uniformity by Compensating for the Threshold Voltages of Both the Driving Thin-Film Transistor and the Organic Light-Emitting Diode for Active-Matrix Organic Light-Emitting Diode DisplaysChing-Lin Fan0Hao-Wei Chen1Hui-Lung Lai2Bo-Liang Guo3Bohr-Ran Huang4Department of Electronic and Computer Engineering, National Taiwan University of Science and Technology, Taipei 106, TaiwanGraduate Institute of Electro-Optical Engineering, National Taiwan University of Science and Technology, Taipei 106, TaiwanDepartment of Electronic and Computer Engineering, National Taiwan University of Science and Technology, Taipei 106, TaiwanDepartment of Electronic and Computer Engineering, National Taiwan University of Science and Technology, Taipei 106, TaiwanDepartment of Electronic and Computer Engineering, National Taiwan University of Science and Technology, Taipei 106, TaiwanThis paper proposes a novel pixel circuit design and driving method for active-matrix organic light-emitting diode (AM-OLED) displays that use low-temperature polycrystalline-silicon thin-film transistors (LTPS-TFTs) as driving element. The automatic integrated circuit modeling simulation program with integrated circuit emphasis (AIM-SPICE) simulator was used to verify that the proposed pixel circuit, which comprises five transistors and one capacitor, can supply uniform output current. The voltage programming method of the proposed pixel circuit comprises three periods: reset, compensation with data input, and emission periods. The simulated results reflected excellent performance. For instance, when ΔVTH=±0.33 V, the average error rate of the OLED current variation was low (<0.8%), and when ΔVTH_OLED=+0.33 V, the error rate of the OLED current variation was 4.7%. Moreover, when the I×R (current × resistance) drop voltage of a power line was 0.3 V, the error rate of the OLED current variation was 5.8%. The simulated results indicated that the proposed pixel circuit exhibits high immunity to the threshold voltage deviation of both the driving poly-Si TFTs and OLEDs, and simultaneously compensates for the I×R drop voltage of a power line.http://dx.doi.org/10.1155/2014/604286 |
| spellingShingle | Ching-Lin Fan Hao-Wei Chen Hui-Lung Lai Bo-Liang Guo Bohr-Ran Huang Improvement in Brightness Uniformity by Compensating for the Threshold Voltages of Both the Driving Thin-Film Transistor and the Organic Light-Emitting Diode for Active-Matrix Organic Light-Emitting Diode Displays International Journal of Photoenergy |
| title | Improvement in Brightness Uniformity by Compensating for the Threshold Voltages of Both the Driving Thin-Film Transistor and the Organic Light-Emitting Diode for Active-Matrix Organic Light-Emitting Diode Displays |
| title_full | Improvement in Brightness Uniformity by Compensating for the Threshold Voltages of Both the Driving Thin-Film Transistor and the Organic Light-Emitting Diode for Active-Matrix Organic Light-Emitting Diode Displays |
| title_fullStr | Improvement in Brightness Uniformity by Compensating for the Threshold Voltages of Both the Driving Thin-Film Transistor and the Organic Light-Emitting Diode for Active-Matrix Organic Light-Emitting Diode Displays |
| title_full_unstemmed | Improvement in Brightness Uniformity by Compensating for the Threshold Voltages of Both the Driving Thin-Film Transistor and the Organic Light-Emitting Diode for Active-Matrix Organic Light-Emitting Diode Displays |
| title_short | Improvement in Brightness Uniformity by Compensating for the Threshold Voltages of Both the Driving Thin-Film Transistor and the Organic Light-Emitting Diode for Active-Matrix Organic Light-Emitting Diode Displays |
| title_sort | improvement in brightness uniformity by compensating for the threshold voltages of both the driving thin film transistor and the organic light emitting diode for active matrix organic light emitting diode displays |
| url | http://dx.doi.org/10.1155/2014/604286 |
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