• Journal of the Korean Recycled Construction Resources Institute
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• v.6 no.4
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• pp.289-296
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• 2018

In this study, we evaluated the feasibility and performance of LCD waste glass as a replacement for cement by using LCD waste glass powder which is generated from manufacturing process due to development of LCD industry. Experiments were carried out by replacing 10% and 20% cement of LCD waste glass with particle size of $12{\mu}m$ of LCD waste glass with OPC and particle size of $5{\mu}m$, respectively. Through experiments, basic properties, mechanical properties and durability of concrete were evaluated. Experimental results show that the compressive strength is high at 10% replacement ratio compared to 20%. The lower the particle size, the higher the strength. The durability test evaluated the chloride penetration performance through the chloride ion diffusion coefficient. The higher the substitution rate and the smaller the particle size, the lower the chloride ion diffusion coefficient and the better the OPC than the all substitution rate. As a result, LCD waste glass concrete with low granularity and proper replacement ratio is considered to be advantageous for durability under salt environment.

• 한국정보디스플레이학회:학술대회논문집
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• 2002.08a
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• pp.552-555
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• 2002

In order to achieve higher performance and low cost a-Si TFT-LCD panel, new material architecture and its process integration for a-Si TFT array manufacturing method were developed. Material combination of low resistant dry-etchable metal and new pixel electrode under currently adopted 4 mask process made it possible to get more-simplified manufacturing method and better device performance for the a-Si TFT-LCD application. Proposed 4 mask process architecture with optimized wet etchants and dry etching process was applicable to various devices such as notebook, monitor and TV.

• Composites Research
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• v.19 no.6
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• pp.8-15
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• 2006

In this study, computational rotor dynamic analyses of a composite roller used for large LCD panel manufacturing process have been conducted. The present computational method is based on the general finite element method with rotating gyroscopic effects of rotor systems. General purpose commercial finite element code, SAMCEF which has special rotordynamics analysis module is applied. For the purpose of numerical verification, comparison study for a benchmark dual rotor model with support bearings is also presented. Detailed finite element models for composite roller with optimized lamination angles are constructed and analyzed considering gravity effect in order to investigate vibration characteristics in actual operation environment. As results of the present study, rotor stability diagrams and mass unbalance responses are presented for different rotating conditions.

• Journal of the Korean Society for Precision Engineering
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• v.20 no.1
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• pp.79-84
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• 2003

A light guide panel is an element of the LCD backlight module that is often used for the display of compact electronic devices. In this study, a laser marking system is proposed to fabricate light guide panel, which can replace other manufacturing methods such as silk printing, stamping, or v-cutting methods. The objective of this research is to evaluate the process parameters of the laser marking system. Light guide patterns were marked with a 50W $CO_2$ laser (CW) to understand the effects of average power and scanning speed on the geometry and quality of groove pattern. The width of the fabricated grooves increases with increasing laser power and decreasing scan speed. In order to analyze surface characteristics and optical properties (luminance, uniformity), SEM photography and BM7 (luminance measuring system) were used. As a result, the optimal conditions of the process parameters were determined.

• 한국정보디스플레이학회:학술대회논문집
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• 2005.07b
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• pp.991-994
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• 2005

We have successfully commercialized a novel optical compensation film, OCB-WV film, for OCB-LCD-TVs which has fast response time and wide viewing angle. The OCB-WV film consists of a 45degree-aligned discotic layer and a high Rth biaxial TAC film, which is suited for a roll-to-roll polarizer manufacturing process. This OCB-WV has brought out the excellent features that OCB intrinsically has, making nextgeneration fast-response LCD-TVs possible and free from image blurring in conjunction with an impulsive driving scheme.

• 한국정보디스플레이학회:학술대회논문집
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• 2003.07a
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• pp.547-550
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• 2003

In this paper we report the optimization method of the pattern size of the electrodes in PVA LCD for the transflective mode in order to improve the optical characteristics. Moreover, we designed the electrode of PVA LCD so as to remove the driving voltage difference between transmissive mode and reflective mode. As a result, we expect very simple manufacturing process and high optical performance even if complex process such as a multi cell gap process and multi driving method are not applied

• Journal of the Semiconductor & Display Technology
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• v.5 no.1 s.14
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• pp.27-31
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• 2006

Non-contact transportation system using air cushion for the manufacturing of large-sized LCD panels was considered. Flow characteristics between air pad and glass plate was analyzed using computational fluid dynamics method to obtain optimized air pad configurations. Effects of the design variables such as hole arrays from which gas is injected, gas-feeding method into the gas supplying channels, and horizontal and vertical pitches of clusters of holes were studied. Optimized air pad unit gave evenly distributed pressure contour on the glass surface and well-suspended levitation height in the experiment.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.37 no.4
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• pp.259-268
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• 2014

Uniform brightness is very crucial for LCD panels, which should be made in during manufacturing. Usually some compensating algorithms are applied to recover the brightness deviation that occurs in actual panels. Although such remedying tools are used, it is very hard to prevent horizontal or vertical crosstalks that represent the brightness level difference in horizontal or vertical direction. This research applied transformability Taguchi dynamic characteristics and "nominal is best" static characteristic simultaneously to design the compensating circuit optimally that may reduce the crosstalks and make uniform brightness level.

• Journal of Korean Institute of Industrial Engineers
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• v.26 no.3
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• pp.238-248
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• 2000

Facilities are getting more automated and informative in modern manufacturing systems, especially in semiconductor and LCD plants. These systems keep a great deal of such information on its current and near-future status as the arrival time and job completion time of their parts. This paper presents an efficient policy for AGV and part routing using information on the future status of the system where AGVs are playing a central role for material handling. Efficient control of AGVs is very important because AGV systems often become the bottleneck and limit the total production capacity of a very expensive plant. The cell controller records the future events chronologically in Next Event Schedule, and uses this list to determine to which place the AGVs and parts to be sent.

• 한국정보디스플레이학회:학술대회논문집
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• 2009.10a
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• pp.587-589
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• 2009

The mode (reflective and transmissive) switchable LCD has been developed by using a treated SR (Selective Reflector) polarizer. We believe that our approach will be a solution to overcome weak points for a reflective and transflective mode in a dark environment and a transmissive mode in a bright environment. Therefore, this can minimize power consumption, and also be easily fabricated in a current manufacturing process, ready for large sizes.