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1 – 10 of 40Thin film transistor liquid crystal display (TFT‐LCD) is the primary flat panel display (FPD) technology, which is quickly becoming pervasive in many applications including…
Abstract
Purpose
Thin film transistor liquid crystal display (TFT‐LCD) is the primary flat panel display (FPD) technology, which is quickly becoming pervasive in many applications including computers, mobile phones, TV monitors, and so on. The finished product of a TFT‐LCD display device is called “module”. A module is subject to a final inspection and packaging (I/P) process before it is shipped to the customer. The I/P operations are primarily manual and the present study seeks to focus on these. The I/P process is strategically important since it directly impacts on both customer service and out‐going quality levels. The operator allocation decision for I/P operations determines the through‐put of the I/P line, and is a function of demand requirement, operator availability, and product dedication.
Design/methodology/approach
This research proposes to solve the I/P process operator allocation problem by mixed‐integer programming formulations. A practical case study has been adopted for the empirical illustrations.
Findings
Empirical results are promising. The potential improvement is ranging from 9 to 20 percent against the current practice at the case study company.
Originality/value
A structured experimental design shows the effectiveness and efficiency of the proposed formulations in solving the problem of the case study.
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T. Tobita, K. Niki, K. Inouye and H. Takasago
Advanced laser micromachining techniques for a TFT‐LCD (thin film transistor‐liquid crystal display) module have been developed to repair various kinds of defects such as shorts…
Abstract
Advanced laser micromachining techniques for a TFT‐LCD (thin film transistor‐liquid crystal display) module have been developed to repair various kinds of defects such as shorts, opens, and degraded TFTs. They have also been designed to analyse failures in the TFT‐LCD. The techniques are as follows: (i) The technique of zapping the excess metal: to repair short defects and/or to isolate the TFT being tested from the adjacent TFTs. This uses a pulse Xe or a Q‐switched YAG laser. (ii) Zapping, followed by the metal deposition technique: to repair open defects and/or to form electrical testing electrodes. This uses a Q‐switched YLF and an Ar ion laser. (iii) The technique of micro‐welding two metal lines separated by an insulating layer: to repair open defects. This uses a Q‐switched YAG laser. (iv) A separation technique utilised on a TFT‐LCD panel adhered with epoxy resin. This uses a pulse Excimer laser. (v) A micro‐annealing technique for a degraded TFT: to recover the TFT characteristics. This uses a Q‐switched YAG laser. Through the study described above, the authors have confirmed that these techniques are highly effective for obtaining TFT‐LCD modules without defects. The yield of TFT‐LCD modules may therefore be expected to improve.
This study aims to refocus the analysis of global political economies using concepts from studies on Varieties of Capitalism (VoC) to track Taiwan’s rise in the Thin Film…
Abstract
Purpose
This study aims to refocus the analysis of global political economies using concepts from studies on Varieties of Capitalism (VoC) to track Taiwan’s rise in the Thin Film Transistor Liquid Crystal Display (TFT-LCD) industry. Taiwanese electronics firms began to outpace their competitors from Japan in TFT-LCD industry’s competition from about the year 2000.
Design/methodology/approach
Drawing on depth interviews and analysis of secondary source material, newspaper and magazine.
Findings
A time factor that helps determine advantage and/or disadvantage of high-tech industry in Japan and Taiwan. Stable organizational structure and less talent mobility in the Japanese TFT-LCD firms may well have been an advantage initially in the transformation process from US firms’ experimental technologies to tacit mass production technologies, but proved to be a disadvantage in the subsequent competition with more mobile talent in Taiwanese firms eager to standardize mass production techniques. Japanese firms’ rigid organizational structure could not keep pace to the market-oriented technology strategy in the global TFT-LCD industry, lost competitive advantage in a rapid pace.
Social implications
VoC literature should be focused to highlight two insights. The first is the premise of institutional forms specific to national models of capitalism. Patterns of technology transfer appear critical in the innovation process, and differ markedly between Taiwan and Japan. Second, the VoC literature suggests comparative institutional advantage.
Originality/value
Through the comparative analyses between Taiwanese capitalism model and Japanese counterparts, we can understand the reason and process of the rise of Taiwan in global TFT-LCD market.
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Chih‐Yao Huang, Ching‐Piao Chen, Rong‐Kwei Li and Chih‐Hung Tsai
The steel bars account for a high percentage of material costs for the current construction projects. At the present time, most of the construction projects for the factories of…
Abstract
The steel bars account for a high percentage of material costs for the current construction projects. At the present time, most of the construction projects for the factories of thin‐film transistor liquid crystal display (TFT‐LCD) complete the transactions of steel bars when the suppliers ship the steel bars to the temporary storage/processing sites. This paper applies the buy‐in concept in the Theory of Constraint (TOC) on the supply chain of steel bars. In this study, suppliers are required to establish warehouses at the construction sites and complete the transactions when the formed and processed steel bars are shipped into the factory sites. The aim is to find a win‐win solution to meet with the expectations from constructors as they hope that there is no need to build up inventories but supply is ready at any time. Also, this paper compares and analyzes the traditional supply/inventory model of steel bars and the Demand‐Pull (D‐P) model under the TOC framework. It is proved that Vendor Management Inventory (VMI) in the D‐P model is able to more effectively manage steel bars as a material.
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Wei Zhang, Yongjiang Shi and Xiaobo Wu
This paper aims to answer two research questions: what latecomer advantages and disadvantages they had, and what strategies they employed to utilize the advantages or to surmount…
Abstract
Purpose
This paper aims to answer two research questions: what latecomer advantages and disadvantages they had, and what strategies they employed to utilize the advantages or to surmount the disadvantages.
Design/methodology/approach
After reviews of the literatures on latecomers' characteristics and the notable rise of Taiwanese thin‐film transistor liquid crystal display (TFT‐LCD) panel manufacturers in the global manufacturing contexts, this research project combined secondary industrial sector data analysis and individual company case study (AUO Ltd) approaches in order to build a conceptual framework and identify latecomers' (dis)advantages.
Findings
This paper advances the existing literature on latecomer advantages and disadvantages by reviewing the spectacular rise of Taiwanese TFT‐LCD panel manufacturers and reveals the importance of some unexplored source of latecomer advantage such as the competition dynamics which is proved to be vital for Taiwanese firms to successfully penetrate into the market. The paper finds the influence of technological regime and argues that the incremental technological advance rather than radical innovation provides latecomers with opportunity to utilize the learning curve effect. It has also discovered new forms of latecomer advantages, for example the free‐rider effect of improved equipment due to suppliers' own learning curve. This paper illustrates the necessity of adequate exploration on technology and product features to understand firms' strategic behaviors. Moreover, the subtle tactics found in this case study may enlighten other latecomers.
Research limitations/implications
The study leaves a number of questions unanswered which warrant more attention. First, the theoretical arguments and experiences from this single case are not easily extendable to the other industries. Broader investigation should be helpful to discover the mechanism between latecomer advantage, strategy and performance. Second, the study of latecomer (dis)advantages and strategies should take the firm features into account to get a whole picture. Third, the examination of interactions between latecomer (dis)advantages and more detailed analytical framework are needed.
Originality/value
Although latecomers' characteristics and strategies have been discussed for many years since Asia economy emerged, TFT‐LCD industry is a relatively new and fast growing industry. How can a latecomer play an important role in emerging industry growing phase? This is novel in contrast with classical latecomer's model in established industry.
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This paper seeks to construct a model for inventory management for multiple periods. The model considers not only the usual parameters, but also price quantity discount, storage…
Abstract
Purpose
This paper seeks to construct a model for inventory management for multiple periods. The model considers not only the usual parameters, but also price quantity discount, storage and batch size constraints.
Design/methodology/approach
Mixed 0‐1 integer programming is applied to solve the multi‐period inventory problem and to determine an appropriate inventory level for each period. The total cost of materials in the system is minimized and the optimal purchase amount in each period is determined.
Findings
The proposed model is applied in colour filter inventory management in thin film transistor‐liquid crystal display (TFT‐LCD) manufacturing because colour filter replenishment has the characteristics of price quantity discount, large product size, batch‐sized purchase and forbidden shortage in the plant. Sensitivity analysis of major parameters of the model is also performed to depict the effects of these parameters on the solutions.
Practical implications
The proposed model can be tailored and applied to other inventory management problems.
Originality/value
Although many mathematical models are available for inventory management, this study considers some special characteristics that might be present in real practice. TFT‐LCD manufacturing is one of the most prosperous industries in Taiwan, and colour‐filter inventory management is essential for TFT‐LCD manufacturers for achieving competitive edge. The proposed model in this study can be applied to fulfil the goal.
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Jee Young Suh and Yong Jin Kim
The electronics industry is a key industry in South Korea. To improve efficiency and maintain a competitive edge in fast-paced technological age it is critical to synchronize…
Abstract
The electronics industry is a key industry in South Korea. To improve efficiency and maintain a competitive edge in fast-paced technological age it is critical to synchronize production supply with market demand. This paper focuses on the strategies which make the “just in time” production system within the electronic supply chain. The presented case study of Samsung Electronics Thin Film Transistor-Liquid Crystal Display (TFT-LCD) Inbound Logistics provides a solid example of process integration in the areas of: packaging, transportation and information sharing. The problems faced by Samsung Electronics in the early 2000’s were a direct result of an imbalance between increased traffic/demand and existing production capacity. The most detrimental of these problems caused delays in supply, shortage of space in the hub center and the bottlenecking of supply transportation. This paper demonstrates how Samsung Electronics reexamined and systematically streamlined their existing processes and how they successfully integrated “lean thinking” strategies to all areas of TFT-LCD production. As a result of the integration of these strategies, Samsung Electronics began using a line-to-line packing system which focused on packing items in a group using a standardized, returnable packing system. Additionally, they opted to replace their paper invoice system for an improved transportation system through which a data could reflect flows of information and materials in real time. The integration of these strategies gave Samsung Electronics a new approach to TFT-LCD Inbound Logistics which allowed them to overcome their dilemmas and resulted in successful outcomes, decreased lead times, higher quality products and an reduction in total costs.
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Chern‐Sheng Lin, Jung Kuo, Chi‐Chin Lin, Yun‐Long Lay and Hung‐Jung Shei
The purpose of this paper is to apply an on‐line automatic inspection and measurement of surface defect of thin‐film transistor liquid‐crystal display (TFT‐LCD) panels in the…
Abstract
Purpose
The purpose of this paper is to apply an on‐line automatic inspection and measurement of surface defect of thin‐film transistor liquid‐crystal display (TFT‐LCD) panels in the polyimide coating process with a modified template matching method and back propagation neural network classification method.
Design/methodology/approach
By using the technique of searching, analyzing, and recognizing image processing methods, the target pattern image of TFT‐LCD cell defects can be obtained.
Findings
With template match and neural network classification in the database of the system, the program judges the kinds of the target defects characteristics, finds out the central position of cell defect, and analyzes cell defects.
Research limitations/implications
The recognition speed becomes faster and the system becomes more flexible in comparison to the previous system. The proposed method and strategy, using unsophisticated and economical equipment, is also verified. The proposed method provides highly accurate results with a low‐error rate.
Practical implications
In terms of sample training, the principles of artificial neural network were used to train the sample detection rate. In sample analysis, character weight was implemented to filter the noise so as to enhance discrimination and reduce detection.
Originality/value
The paper describes how pre‐inspection image processing was utilized in collaboration with the system to excel the inspection efficiency of present machines as well as for reducing system misjudgment. In addition, the measure for improving cell defect inspection can be applied to production line with multi‐defects to inspect and improve six defects simultaneously, which improves the system stability greatly.
Details
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Chern‐Sheng Lin, Yo‐Chang Liao, Yun‐Long Lay, Kun‐Chen Lee and Mau‐Shiun Yeh
The purpose of this research is to develop an automatic optical inspection system for thin film transistor (TFT) liquid crystal display (LCD).
Abstract
Purpose
The purpose of this research is to develop an automatic optical inspection system for thin film transistor (TFT) liquid crystal display (LCD).
Design/methodology/approach
A new algorithm that accounts for the closing, opening, etching, dilating, and genetic method is used. It helps to calculate the location and rotation angle for transistor patterns precisely and quickly. The system can adjust inspection platform parameters according to viewed performance. The parameter adaptation occurs in parallel with running the genetic algorithm and imaging processing methods. The proposed method is compared with the algorithms that use artificial parameter sets.
Findings
This system ensures high quality in an LCD production line. This multipurpose image‐based measurement method uses unsophisticated and economical equipment, and it also detects defects in the micro‐fabrication process.
Originality/value
The experiment's results show that the proposed method offers advantages over other competing methods.
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Kavindra Kandpal and Navneet Gupta
The purpose of this paper is to present a comprehensive review on development and future trends in zinc oxide thin film transistors (ZnO TFTs). This paper presents the development…
Abstract
Purpose
The purpose of this paper is to present a comprehensive review on development and future trends in zinc oxide thin film transistors (ZnO TFTs). This paper presents the development of TFT technology starting from amorphous silicon, poly-Si to ZnO TFTs. This paper also discusses about transport and device modeling of ZnO TFT and provides a comparative analysis with other TFTs on the basis of performance parameters.
Design/methodology/approach
It highlights the need of high–k dielectrics for low leakage and low threshold voltage in ZnO TFTs. This paper also explains the effect of grain boundaries, trap densities and threshold voltage shift on the performance of ZnO TFT. Moreover, it also addresses the challenges like requirement of stable p-type ZnO semiconductor for various electronic applications and high value of ZnO mobility to meet growing demand of high-definition light emitting diode TV (HD-LED TV).
Findings
This review will motivate the readers to further investigate the conduction mechanism, best alternate for gate-dielectric and the deposition technique optimization for the enhancement of the performance of ZnO TFTs.
Originality/value
This is a literature review. The technological evolution of TFT in general and ZnO TFT in particular is presented in this paper.
Details