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Abstract
We suggest the 留学生光学工业应用论文 novel EEFL (External Electrode Fluorescent Lamp) Backlight System 3 types; the first aspect is a high optical efficiency second is reduction of mechanical size of Backlight, and the last is low power consumption in large LCD Backlight System. To gain a high optical efficiency, we consider the narrow diameter (Φ 3.0) lamp of EEFL Backlight System. As the impedance of the narrow diameter (Φ 3.0) lamp is higher than that of conventional (Φ 4.0) EEFL. A high impedance of lamp is caused the increase of power consumption and a driving voltage of lamp. But its characteristic of an enhancement luminance could be possible for a high optical efficiency. We introduce a method for decrease of a mechanical size for large Backlight. The length of electrode for EEFL system must be increased as a small diameter and a long length of lamp. For that reason is caused the increase of Bezel Size for LCD TV. In this paper, we suggest Adel (Differential Diameter External Electrode Fluorescent Lamp). DEFL is made by junction between Φ 4.0mm glass tube of emission part and Φ 8.0mm glass tube of electrode part. Finally we explain Φ 4.0mm EEFL system for low power consumption in comparison with Φ 4.0mm CCFL backlight system.

1. Introduction
The cost competition becomes major factor according to great demand above 32inch large size LCD-TV. The cost of Backlight occupies a big portion of LCD TV. Especially, the lamp has an important part for the cost and performance. Recently, each Icemaker has been studied of EEFL. Because it has a number of merits, typically including long lifetime, simplicity of manufacture, mass product and low cost. Moreover, direct lighting backlights comprising multiple EEFLs connected in parallel can be driven with a single inverter [1-10]. Considering these merits of EEFL, LG. Philips LCD have commercialized it in the world first product is applied EEFL Backlight System since2003. EEFL has a discharge mechanism using wall charge. Therefore, the electrode length of EEFL must be changed by diameter and length of lamp to maintain the operating voltage properly. It is leaded to extend of the Bezel Size and it is hard to apply an EEFL for large LCD TV. To lower the operating voltage we must increase the electrode capacitance of EEFL by extending electrode length of EEFL or by using high dielectric constant glass tube. In this paper, we studied 3-type EEFL(DEFL,Φ 3.0mm EEFL, Φ 4.0mm EEFL). One is for reduction bezel size, another is for high optical efficiency, and the other is for low power consumption in comparison to CCFL backlight system.

5. References
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