Digital-to-analog converter with gamma correction on glass substrate for TFT-panel applications

Tzu Ming Wang*, Yu Hsuan Li, Ming-Dou Ker

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    3 Scopus citations

    Abstract

    Low-temperature polysilicon (LTPS) technology has a tendency towards integrating all circuits on glass substrate. However, the poly-Si TFTs suffered poor uniformity with large variations in the device characteristics due to a narrow laser process window for producing large-grained poly-Si TFTs. The device variation is a serious problem for circuit realization on the LCD panel, so how to design reliable on-panel circuits is a challenge for system-on-panel (SOP) applications. In this work, a 6-bit R-string digital-to-analog converter (DAC) with gamma correction on glass substrate for TFT-panel applications is proposed. The proposed circuit, which is composed of a folded R-string circuit, a segmented digital decoder, and reordering of the decoding circuit, has been designed and fabricated in a 3-μm LTPS technology. The area of the new proposed DAC circuit is effectively reduced to about one-sixth compared to that of the conventional circuit for the same LTPS process.

    Original languageEnglish
    Pages (from-to)785-794
    Number of pages10
    JournalJournal of the Society for Information Display
    Volume17
    Issue number10
    DOIs
    StatePublished - Oct 2009

    Keywords

    • Digital-to-analog converter (DAC)
    • Gamma correction
    • Low-temperature polysilicon (LTPS)
    • System-on-panel (SOP)

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