Browsing by Author "Lin, Chi-Hao"

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Active in-cell touch circuit using floating common electrode as sensing pad for the large size in-plane-switching liquid crystal displays
(2017-10-01)
Tai, Ya-Hsiang
;
Lin, Chi-Hao
;
Cheu, Wei-Jia
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光電工程學系
;
Department of Photonics
In this paper, we propose an in-cell active touch circuit using the concept of floating common electrode for large size in-plane-switching liquid crystal displays. Compared with the conventional passive in-cell touch circuit, the proposed method can greatly reduce the readout channel numbers by sharing the sensing bus for one column. Because the touch signal is amplified in the pixel, the touch panel can be easily scaled up in size. Simulation results show that the difference between touch and no-touch signals can be as large as 10A even with threshold voltage shift of +/- 1V. The possible issues of the proposed method are experimentally verified.
An external compensation method for AMOLED using the concept of ramp-stop
(2017-11-01)
Tai, Ya-Hsiang
;
Lin, Chi-Hao
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電機學院
;
光電工程學系
;
College of Electrical and Computer Engineering
In this paper, we propose an external feedback method to compensate the device variation for active-matrix organic light-emitting diode. The pixel data current is controlled by ramping the gate voltage and converted to the sensed voltage V-sense in real time. When V-sense is equal to a preset voltage V-data, the switching block outputs the low potential to stop the ramping. Therefore, the gate voltage is locked at the value corresponding to the target data current. This circuit is implemented with three thin-film transistors in the active area and some functional blocks in driver integrated circuit (IC), namely, sentinel block, current-voltage converting block, and switching block. Unlike the other usual methods of external compensation requiring double number of connections between driver IC and glass, by using the common ramping signal and a simple circuit made on glass, the proposed method can be implemented with only one pin per column.
Bovine serum albumin detection and quantitation based on capacitance measurements of liquid crystals
(2016-08-29)
Lin, Chi-Hao
;
Lee, Mon-Juan
;
Lee, Wei
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影像與生醫光電研究所
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Institute of Imaging and Biomedical Photonics
Liquid crystal (LC)-based biosensing is generally limited by the lack of accurate quantitative strategies. This study exploits the unique electric capacitance properties of LCs to establish quantitative assay methods for bovine serum albumin (BSA) biomolecules. By measuring the voltage-dependent electric capacitance of LCs under an alternating-current field with increasing amplitude, positive correlations were derived between the BSA concentration and the electric capacitance parameters of LCs. This study demonstrates that quantitative analysis can be achieved in LC-based biosensing through electric capacitance measurements extensively employed in LCD research and development. Published by AIP Publishing.
Feasibility Study of Integrating Source Driver on Array Using Low-Temperature Polycrystalline Silicon Thin-Film Transistors
(2016-12)
Tai, Ya-Hsiang
;
Lin, Ching-Chih
;
Lin, Chi-Hao
;
Chang, Chun-Yi
;
光電工程學系
In this paper, we proposed a new kind of source driver with fully digital driving and a new approach to implement source driver on array (SoA). For the SoA circuit, the digital/analogue converters and buffers are replaced with pulse width modulation circuit and data voltage setting circuit to simplify the source driver. Thus, the signal converting part in the conventional source driver can be omitted and is much more easy to be built with thin-film transistors on the glass. Further, the feasibility of integrating SoA will be studied in the practical way. The layout area and power consumption are found to be the obstacles if we want to use the current thin-film transistor technology to implement SoA. However, the fully digital driving concept can be still applied to develop the configuration of digital interface. We can use the external source driver to produce the digital pulse width signal to set the pixel voltage. This method avoids issue of layout area and power consumption. Hence, the concept of digital interface is much more practical and feasible to reduce the cost and power of data driving instead of SoA.
Feasibility Study of Integrating Source Driver on Array Using Low-Temperature Polycrystalline Silicon Thin-Film Transistors
(2016-12)
Tai, Ya-Hsiang
;
Lin, Ching-Chih
;
Lin, Chi-Hao
;
Chang, Chun-Yi
;
光電工程學系
In this paper, we proposed a new kind of source driver with fully digital driving and a new approach to implement source driver on array (SoA). For the SoA circuit, the digital/analogue converters and buffers are replaced with pulse width modulation circuit and data voltage setting circuit to simplify the source driver. Thus, the signal converting part in the conventional source driver can be omitted and is much more easy to be built with thin-film transistors on the glass. Further, the feasibility of integrating SoA will be studied in the practical way. The layout area and power consumption are found to be the obstacles if we want to use the current thin-film transistor technology to implement SoA. However, the fully digital driving concept can be still applied to develop the configuration of digital interface. We can use the external source driver to produce the digital pulse width signal to set the pixel voltage. This method avoids issue of layout area and power consumption. Hence, the concept of digital interface is much more practical and feasible to reduce the cost and power of data driving instead of SoA.
Fully Digital Driving Circuit for TFT LCD Using the Concept of Ramp-Stop
(2019-03-01)
Tai, Ya-Hsiang
;
Lin, Chi-Hao
;
Ho, Tsung-Hsuan
;
Huang, Yu-Sheng
;
Huang, Sheng-Miao
A fully digital driving circuit for thin-film transistor liquid crystal display can offer benefits, including less power consumption and a shortened design schedule. Using the pulsewidth signal to control the moment to stop the ramp voltage, the pixel voltage can be set accurately. In this paper, the possible issues of power consumption, device nonuniformity, and parasitic capacitance are well-studied to prove the feasibility and advantages of the digital driving method. It is prospectively expected to substitute for the conventional analog driving method in the future.
Liquid-crystal-based biosensing beyond texture observations
(2015-01-01)
Lee, Mon-Juan
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Lin, Chi-Hao
;
Lee, Wei
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光電學院
;
College of Photonics
The texture observation has long been the core technique in liquid crystal (LC)-based biosensing. One of the drawbacks of this observational means is the difficulty in quantitative analysis. In this invited paper, we report on our recent attempt to improve the LC-based biosensing technique through the analysis of bovine serum albumin (BSA), a protein standard commonly used in the assay of protein concentration. We propose to overcome the technical limitations in the analysis of LC-based biosensors by considering alternative measuring schemes. By means of the induced changes in electro-optical properties of LCs in the presence of different concentrations of BSA, novel quantitative techniques specific for LC-based biosensors are developed.
LTPS Active Pixel Circuit With Threshold Voltage Compensation for X-Ray Imaging Applications
(2019-10-01)
Tai, Ya-Hsiang
;
Lin, Chi-Hao
;
Yeh, Shan
;
Tu, Cheng-Che
;
Karim, Karim S.
In this article, we proposed a low-temperature poly-silicon (LTPS) active pixel sensor (APS) circuit with threshold voltage (V-th) compensation. LTPS thin-film transistors (TFTs) are known to degrade under long-term irradiation and this is quantified. Simulation results and experimental data confirm that the proposed APS circuit compensates the instability of LTPS TFTs and is a promising, high-performance alternative to current amorphous silicon (a-Si) pixel-based X-ray detectors.
Probabilistic Structure from Sound
(2009)
Wang, Chieh-Chih
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Lin, Chi-Hao
;
Hu, Jwu-Sheng
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電控工程研究所
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Institute of Electrical and Control Engineering
Auditory perception is one of the most important functions for robotics applications. Microphone arrays are widely used for auditory perception in which the spatial structure of microphones is usually known. In practice, microphone array calibration can be tedious and other devices or means are required. The structure from sound (SFS) approach addresses the problem of simultaneously localizing a set of microphones and a set of acoustic events that provides a great flexibility to calibrate different setups of microphone arrays. However, the existing method does not take measurement uncertainty into account and does not provide uncertainty estimates of the SFS results. In this paper, we propose a probabilistic structure from sound (PSFS) approach using the unscented transform in which the uncertainties of the PSFS results are also available. In addition, a probabilistic sound source localization approach using the PSFS results is provided to improve sound source localization accuracy. The ample results of simulation and experiments using low-cost, off-the-shelf microphones demonstrate the feasibility and performance of the proposed PSFS approach. (C) Koninklijke Brill NV, Leiden and The Robotics Society of Japan, 2009