A charge integrator sensing circuit for real-time external compensation regardless of threshold voltages of organic light emitting diodes
This paper proposed a novel sensing circuit using a charge integrator (CI) to compensate for the thin-film transistors (TFTs) in organic light-emitting diode (OLED) displays. A higher CI initialization voltage is commonly preferred for sensing various TFT characteristics, but this may turn on OLED w...
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| Format: | Article |
| Language: | English |
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Taylor & Francis Group
2025-02-01
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| Series: | Journal of Information Display |
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| Online Access: | https://www.tandfonline.com/doi/10.1080/15980316.2025.2472082 |
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| author | Myung Gi Lim Seung-Woo Lee |
| author_facet | Myung Gi Lim Seung-Woo Lee |
| author_sort | Myung Gi Lim |
| collection | DOAJ |
| description | This paper proposed a novel sensing circuit using a charge integrator (CI) to compensate for the thin-film transistors (TFTs) in organic light-emitting diode (OLED) displays. A higher CI initialization voltage is commonly preferred for sensing various TFT characteristics, but this may turn on OLED with a low threshold voltage. The proposed sensing circuit separates the initialization voltages for the TFT and the CI, allowing accurate TFT current sensing regardless of OLED characteristics. The suggested method calculates the threshold voltage (VTH) and the transconductance parameter (K) of TFT using currents sensed at two gate–source voltages (VGSs) for compensation. Real-time compensation is achieved by performing sensing within vertical blanking time. We simulated compensation performance under ΔVTH and ΔK variations of ±0.5 V and ±10%, which demonstrated the current deviation decreased from a maximum of 70.20% to 1.07%. We then fabricated an 11-inch active-matrix OLED (AMOLED) panel to verify the compensation performance. The measurement results revealed that the current deviation decreased from a maximum of 38.11% to 2.55%. The compensation performance was successfully demonstrated with an 11-inch AMOLED panel. The proposed sensing circuit allows CI to be used regardless of OLED characteristics, making it suitable for a wider range of display applications. |
| format | Article |
| id | doaj-art-9786b39d3fc2486c837d6dff38df9e58 |
| institution | DOAJ |
| issn | 1598-0316 2158-1606 |
| language | English |
| publishDate | 2025-02-01 |
| publisher | Taylor & Francis Group |
| record_format | Article |
| series | Journal of Information Display |
| spelling | doaj-art-9786b39d3fc2486c837d6dff38df9e582025-08-20T03:22:18ZengTaylor & Francis GroupJournal of Information Display1598-03162158-16062025-02-0111110.1080/15980316.2025.2472082A charge integrator sensing circuit for real-time external compensation regardless of threshold voltages of organic light emitting diodesMyung Gi Lim0Seung-Woo Lee1Department of Information Display, Kyung Hee University, Dongdaemun-gu Seoul, Republic of KoreaDepartment of Information Display, Kyung Hee University, Dongdaemun-gu Seoul, Republic of KoreaThis paper proposed a novel sensing circuit using a charge integrator (CI) to compensate for the thin-film transistors (TFTs) in organic light-emitting diode (OLED) displays. A higher CI initialization voltage is commonly preferred for sensing various TFT characteristics, but this may turn on OLED with a low threshold voltage. The proposed sensing circuit separates the initialization voltages for the TFT and the CI, allowing accurate TFT current sensing regardless of OLED characteristics. The suggested method calculates the threshold voltage (VTH) and the transconductance parameter (K) of TFT using currents sensed at two gate–source voltages (VGSs) for compensation. Real-time compensation is achieved by performing sensing within vertical blanking time. We simulated compensation performance under ΔVTH and ΔK variations of ±0.5 V and ±10%, which demonstrated the current deviation decreased from a maximum of 70.20% to 1.07%. We then fabricated an 11-inch active-matrix OLED (AMOLED) panel to verify the compensation performance. The measurement results revealed that the current deviation decreased from a maximum of 38.11% to 2.55%. The compensation performance was successfully demonstrated with an 11-inch AMOLED panel. The proposed sensing circuit allows CI to be used regardless of OLED characteristics, making it suitable for a wider range of display applications.https://www.tandfonline.com/doi/10.1080/15980316.2025.2472082Active-matrix organic light-emitting diode (AMOLED) displaycharge integrator (CI)external compensationreal-time compensationthin-film transistor (TFT)threshold voltage (VTH) |
| spellingShingle | Myung Gi Lim Seung-Woo Lee A charge integrator sensing circuit for real-time external compensation regardless of threshold voltages of organic light emitting diodes Journal of Information Display Active-matrix organic light-emitting diode (AMOLED) display charge integrator (CI) external compensation real-time compensation thin-film transistor (TFT) threshold voltage (VTH) |
| title | A charge integrator sensing circuit for real-time external compensation regardless of threshold voltages of organic light emitting diodes |
| title_full | A charge integrator sensing circuit for real-time external compensation regardless of threshold voltages of organic light emitting diodes |
| title_fullStr | A charge integrator sensing circuit for real-time external compensation regardless of threshold voltages of organic light emitting diodes |
| title_full_unstemmed | A charge integrator sensing circuit for real-time external compensation regardless of threshold voltages of organic light emitting diodes |
| title_short | A charge integrator sensing circuit for real-time external compensation regardless of threshold voltages of organic light emitting diodes |
| title_sort | charge integrator sensing circuit for real time external compensation regardless of threshold voltages of organic light emitting diodes |
| topic | Active-matrix organic light-emitting diode (AMOLED) display charge integrator (CI) external compensation real-time compensation thin-film transistor (TFT) threshold voltage (VTH) |
| url | https://www.tandfonline.com/doi/10.1080/15980316.2025.2472082 |
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