Amorphous IGZO TFT-Based Pixel Buffer to Suppress Blue-Phase Liquid Crystal High-Frequency Effect

Chih-Lung Lin, Po Syun Chen, Po Cheng Lai, Chih Cheng Hsu, Jui Hung Chang

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

This letter discusses the frequency effect of polymer-stabilized blue-phase liquid crystal (BPLC) on the data voltages of a conventional pixel circuit and develops a new pixel buffer that exploits amorphous indium-gallium-zinc-oxide thin-film transistors (TFTs). During high-speed operations, BPLC seriously distorts data voltages because of the highly frequency-dependent dielectric anisotropy. To lessen the frequency-dependent effect of BPLC, a source-follower structure is integrated into the proposed pixel buffer to prolong the charging time of the BPLC cell. The experimental results show that the source-follower yields linear output characteristics. Further compensation for TFT VTH shifts and suppressing the leakage current are confirmed to make the data voltages on the BPLC cell highly uniform and stable.

Original languageEnglish
Article number8070321
Pages (from-to)1673-1675
Number of pages3
JournalIEEE Electron Device Letters
Volume38
Issue number12
DOIs
Publication statusPublished - 2017 Dec 1

Fingerprint

Liquid Crystals
Amorphous films
Thin film transistors
Liquid crystals
Buffers
Pixels
Electric potential
Zinc Oxide
Gallium
Indium
Zinc oxide
Leakage currents
Oxide films
Polymers
Anisotropy
Networks (circuits)

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

Cite this

Lin, Chih-Lung ; Chen, Po Syun ; Lai, Po Cheng ; Hsu, Chih Cheng ; Chang, Jui Hung. / Amorphous IGZO TFT-Based Pixel Buffer to Suppress Blue-Phase Liquid Crystal High-Frequency Effect. In: IEEE Electron Device Letters. 2017 ; Vol. 38, No. 12. pp. 1673-1675.
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Amorphous IGZO TFT-Based Pixel Buffer to Suppress Blue-Phase Liquid Crystal High-Frequency Effect. / Lin, Chih-Lung; Chen, Po Syun; Lai, Po Cheng; Hsu, Chih Cheng; Chang, Jui Hung.

In: IEEE Electron Device Letters, Vol. 38, No. 12, 8070321, 01.12.2017, p. 1673-1675.

Research output: Contribution to journalArticle

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AB - This letter discusses the frequency effect of polymer-stabilized blue-phase liquid crystal (BPLC) on the data voltages of a conventional pixel circuit and develops a new pixel buffer that exploits amorphous indium-gallium-zinc-oxide thin-film transistors (TFTs). During high-speed operations, BPLC seriously distorts data voltages because of the highly frequency-dependent dielectric anisotropy. To lessen the frequency-dependent effect of BPLC, a source-follower structure is integrated into the proposed pixel buffer to prolong the charging time of the BPLC cell. The experimental results show that the source-follower yields linear output characteristics. Further compensation for TFT VTH shifts and suppressing the leakage current are confirmed to make the data voltages on the BPLC cell highly uniform and stable.

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