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Your search keyword '"Lai, Po-Chun"' showing total 28 results
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28 results on '"Lai, Po-Chun"'

17. Suppressing ${V_{\mathrm{TH}}}$ Variations in LTPS Thin-Film Transistors With Current Scaling Ratio Modulation for AMOLED Display.

Author

Lin, Chih-Lung, Hsu, Chih-Cheng, Chen, Po-Syun, Lai, Po-Chun, Lee, Po-Ting, and Kuo, Pin-Yen

Subjects
ELECTRIC potential, LOW temperatures, CRYSTAL structure, SILICON, THIN film transistors
Abstract

This brief suppresses threshold voltage (${V}_{\text {TH}}$) variations in low-temperature polycrystalline-silicon thin-film transistors (LTPS TFTs) with a new current scaling ratio modulation method for the application of active-matrix organic light-emitting diode displays. With a newly proposed 3T2C LTPS TFT-based pixel circuit, high-current scaling ratios at low gray levels and low ratios at high gray levels are achieved. Thus, the programming time at low gray levels can be reduced, and the driving currents of the OLED are efficiently generated over the entire data range without consuming extra power for the current source. The driving currents are also independent of the threshold voltage of the driving TFT and the power line voltage, guaranteeing the uniformity of the current. Simulation results demonstrate that the relative current error rates are below 3.7% as the threshold voltage varies ±0.5 V and below 5.3% as the threshold voltage varies ±0.5 V and the power line voltage drops by 1 V; the programming time can be as short as only $12~\mu \text{s}$. [ABSTRACT FROM AUTHOR]

Published
2018
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27. Design of Pixel Circuits for Blue-Phase Liquid Crystal Displays.

Author

Lin, Chih-Lung, Cheng, Mao-Hsun, Tu, Chun-Da, Lai, Po-Chun, and Lai, Po-Cheng

Abstract

This work reviews pixel circuits for blue-phase liquid crystal displays (BPLCDs) and presents two novel pixel circuits for the BPLC. With respect to the high-operating-voltage BPLC, the first developed pixel circuit comprises practical source driver integrated circuits (ICs) and an additional signal with three voltage levels to widen the voltage range from a data line in order to enable the BPLC to achieve high transmittance. For the low-operating-voltage BPLC with a large dielectric anisotropy, the second pixel circuit boosts the gate voltage of the switch thin-film transistor (TFT) to enhance its driving capability to deal with the large equivalent capacitance of the BPLC. Simulation results verify the functions of both new pixel circuits with Full High Definition (FHD, 1920\times1080) resolution and a frame rate of 120 Hz. [ABSTRACT FROM PUBLISHER]

Published
2016
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28. Driving Scheme Using Bootstrapping Method for Blue-Phase LCDs.

Author

Tu, Chun-Da, Lin, Chih-Lung, Yan, Jin, Chen, Yuan, Lai, Po-Chun, and Wu, Shin-Tson

Abstract

We present a new pixel circuit on glass using hydrogenated amorphous silicon (a-Si:H) for driving polymer-stabilized blue-phase liquid crystal displays (BPLCDs). Different from conventional nematics, BPLC demands a large dielectric anisotropy in order to lower the operation voltage. As a result, the pixel's capacitance is increased by \sim\10\times, which seriously limits the charging capability and optical efficiency. Simulation results show that the average error rate of storage voltage in pixel circuit is below 5.14% for 180 Hz operating frequency. [ABSTRACT FROM PUBLISHER]

Published
2013
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