TY - JOUR
T1 - Amorphous IGZO TFT-Based Pixel Buffer to Suppress Blue-Phase Liquid Crystal High-Frequency Effect
AU - Lin, Chih Lung
AU - Chen, Po Syun
AU - Lai, Po Cheng
AU - Hsu, Chih Cheng
AU - Chang, Jui Hung
N1 - Funding Information:
Manuscript received September 23, 2017; revised October 6, 2017; accepted October 6, 2017. Date of publication October 17, 2017; date of current version November 22, 2017. This work was supported in part by the Ministry of Science and Technology of Taiwan under Project MOST 105-2218-E-006-009, Project MOST 104-2221-E-006-189-MY3, and Project MOST 106-2622-E-006-011-CC2 and in part by the AU Optronics Corporation. The review of this letter was arranged by Editor S.-J. Chang. (Corresponding author: Chih-Lung Lin.) C.-L. Lin is with the Advanced Optoelectronic Technology Center, Department of Electrical Engineering, National Cheng Kung University, Tainan 701-01, Taiwan (e-mail: [email protected]).
Publisher Copyright:
© 2017 IEEE.
PY - 2017/12
Y1 - 2017/12
N2 - 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.
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.
UR - http://www.scopus.com/inward/record.url?scp=85040539019&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85040539019&partnerID=8YFLogxK
U2 - 10.1109/LED.2017.2763610
DO - 10.1109/LED.2017.2763610
M3 - Article
AN - SCOPUS:85040539019
SN - 0741-3106
VL - 38
SP - 1673
EP - 1675
JO - IEEE Electron Device Letters
JF - IEEE Electron Device Letters
IS - 12
M1 - 8070321
ER -