• 한국정보디스플레이학회:학술대회논문집
• /
• 2005.07a
• /
• pp.511-512
• /
• 2005

• Proceedings of the IEEK Conference
• /
• 2003.07b
• /
• pp.903-906
• /
• 2003

In this paper, we proposed high slew-rate and low-power OP-AMP of the data driver for TFT-LCDs. Proposed OP-AMP contains newly developed rail-to-rail class-AB input circuit which enables the low-quiescent current and high slew-rate OP-AMP. The slew-rate and the quiescent current of the proposed OP-AMP are 31.2V/$\mu$sec and 5$\mu$A, respectively.

• 한국정보디스플레이학회:학술대회논문집
• /
• 2007.08a
• /
• pp.286-289
• /
• 2007

We have developed an automated circuit defect inspection and repair method that can be used to improve the yield ratio of TFT-LCD. The method focuses on correcting resist patterns after the development process to ensure shape regularity. We built a prototype system and confirmed that the method is valid.

• Journal of Information Display
• /
• v.2 no.2
• /
• pp.22-26
• /
• 2001

This paper presents the idea of staggered voting for the efficient TMR implementation of shift register chains for improving the yield of Poly-Si TFT-LCD driving circuits. The paper discusses the characteristic features of staggered voting and performs a quantitative evaluation of its effectiveness. Staggered voting allows us to improve the reliability of a single-voter TMR chain significantly when the probability of a voter failure is not negligible.

• 한국정보디스플레이학회:학술대회논문집
• /
• 2006.08a
• /
• pp.1251-1254
• /
• 2006

A novel a-Si TFT integrated gate driver circuit using multi-thread driving has been developed. The circuit consists of two independent shift registers alternating between the two mode, "wake" and "sleep". The degradation of the circuit is retarded since the bias stress is removed during the sleep mode. It has been successfully integrated in 14.1-in. XGA LCD Panel, showing enhanced stability.

• 한국정보디스플레이학회:학술대회논문집
• /
• 2004.08a
• /
• pp.1040-1043
• /
• 2004

As time goes by, the market demand increases and each LCD panel manufacturing company makes every effort to produce more panels in a limited time. It is necessary to reduce the cost and time of production for the improvement of productivity in manufacturing companies. The increased speed of thin films growth used in the TFT process brings improvement of productivity but it is also accompanied by a drop in display quality due to a characteristic change of the thin film. So in our dissertation, we deal with the increased speed of a-Si layer growth and the proportioned a drop in characteristic quality. We discuss a drop in display quality by a characteristic change of a-Si layer and we propose a counter-plan through panel design improvement. We have already applied our plan to the 15" XGA panel and confirmed the improved result.

• 한국정보디스플레이학회:학술대회논문집
• /
• 2003.07a
• /
• pp.664-667
• /
• 2003

Super In Plane Switching (S-IPS) technology is applied for large TFT-LCD panels used in TV applications. It has a lot of advantages in comparison to the alternative, VA technology. S-IPS shows excellent viewing angle properties and fast response time between intermediate gray levels. If the performance parameters which describe the actual visual performance are considered, S-IPS is much more advantageous.$^{1)}$ However, it shows relatively low contrast ratio in diagonal direction compared to viewing angle characteristic in upper/down direction in S-IPS. In order to compensate the relatively low diagonal contrast ratio, a newly designed optical film was applied and the truly wide view angle of a S-IPS TW(True Wide)-IPS) was achieved. Our newly developed 30-inch TFT-LCD panel reveals TW-IPS that is optimized for TV application

• 한국정보디스플레이학회:학술대회논문집
• /
• 2002.08a
• /
• pp.401-404
• /
• 2002

We have studied on response time of the fringe-field switching (FFS) TFT-LCD using the LCs with negative dielectric anisotropy related to rubbing angle. Simulation and experimental results shows that when a rubbing angle approached $45^{\circ}$, a slope of voltage-dependent curve is decreased such that the operation voltage is increased, however the whole response characteristic between inter-gray levels have a trend to be fast.

• 한국정보디스플레이학회:학술대회논문집
• /
• 2005.07a
• /
• pp.457-459
• /
• 2005

Low viscosity LCs have been developed for fast response time improvement of the TFT-LCD Monitors based on TN mode. This low viscosity characteristic s cause the pretilt angle to be changed and the uniformity to degrade. We have studied on the pretilt angle effect by the various components used for low viscosity LCs. We prepared the panels by using these various components and measured pretilt angle for this research. As a result of this research, we have found out that each low viscosity component has the different pretilt angle level and uniformity. For good display quality, it is important to keep the stable pretilt angle. The low viscosity LCs with this stable pretilt angle make it possible to prepare the high performance TFT-LCD Monitor with both fast response time characteristics and good display quality

• Journal of IKEEE
• /
• v.14 no.2
• /
• pp.51-57
• /
• 2010

A CMOS rail-to-rail high voltage buffer amplifier is proposed to drive the gamma correction reference voltage of large TFT LCD panels. It is operating by a single supply and only shows current consumption of 0.5mA at 18V power supply voltage. The circuit is designed to drive the gamma correction voltage of 8-bit or 10-bit high resolution TFT LCD panels. The buffer has high slew rate, 0.5mA static current and 1k$\Omega$ resistive and capacitive load driving capability. Also, it offers wide supply range, offset voltages below 50mV at 5mA constant output current, and below 2.5mV input referred offset voltage. To achieve wide-swing input and output dynamic range, current mirrored n-channel differential amplifier, p-channel differential amplifier, a class-AB push-pull output stage and a input level detector using hysteresis comparator are applied. The proposed circuit is realized in a high voltage 0.18um 18V CMOS process technology for display driver IC. The circuit operates at supply voltages from 8V to 18V.