On-panel analog output buffer for data driver with consideration of device characteristic variation in LTPS technology

Yu Hsuan Li*, Ming-Dou Ker, Chun Yao Huang, Chun Yuan Hsu

*Corresponding author for this work

    Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

    2 Scopus citations


    A class-A analog output buffer for the data driver with consideration of device variation in low temperature poly-silicon (LTPS) technology is proposed. With high enough mobility, LTPS thin-film transistor (TFT) has been suitable for the realization with driver circuits on the LCD panel to meet system-on-panel (SoP) applications. However, the device characteristics of poly-Si TFTs have poor uniformity and suffer from huge variations in different locations due to the poly-silicon grain structures. Besides, the variation on device characteristic of the N-type TFT is much worse than that of P-type TFT. Therefore, replacing the critical part of the analog circuit by P-TFTs is a good design solution for suppressing device characteristic variation in order to improve manufacturing yield of the analog circuit on panel. A class-A output buffer realized with P-TFTs as the input stage has been designed and fabricated in a 8-μm LTPS technology. From the experimental results, this proposed analog output buffer with P-TFTs as input stage can be operated at 50-kHz operation frequency with at least a 1-to-9 V output swing for using in the on-panel data drivers to provide a uniform brightness and high resolution display.

    Original languageEnglish
    Title of host publicationAD'07 - Proceedings of Asia Display 2007
    Number of pages6
    StatePublished - Mar 2007
    EventAsia Display 2007, AD'07 - Shanghai, China
    Duration: 12 Mar 200716 Mar 2007

    Publication series

    NameAD'07 - Proceedings of Asia Display 2007


    ConferenceAsia Display 2007, AD'07


    • Analog output buffer
    • Data driver
    • LTPS
    • Manufacturing yield
    • Slew rate


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