Byoung-Hee Hong

Glass tube of high dielectric constant and low dielectric loss for external electrode fluorescent lamps

A glass tube of aluminosilicate glass, with high dielectric constant K∼6.0 and low dielectric loss tan δ∼8.0×10−4, was investigated for the external electrode fluorescent lamps (EEFLs) of a dielectric barrier discharge. Compared with conventional EEFLs made out of borosilicate glass tubes with K∼(4.9−5.3) and tan δ∼(2.3−2.4)×10−3, the efficiency of the aluminosilicate EEFL increases by 15%−25% even at high luminance above 20 000 cd/m2 and the pinhole stability of the aluminosilicate EEFL also improves remarkably. In a soda-lime glass EEFL with a high dielectric loss tan δ∼7.0×10−3, the luminance and pinhole stability deteriorate even with a high dielectric constant K∼7.2 at room temperature, because the value of tan δ escalates as the temperature on the external electrode increases due to the dielectric heat dissipation.

P-82: Super-Length External-Electrode Fluorescent Lamps

The lamp length 0.6∼2.0 m of external electrode fluorescent lamps for the backlight of LCD-TVs has been investigated with respect to the lamp property, such as the current and voltage, the luminance and efficiency, and the luminance uniformity along the tube.

P-95: Reduction of Firing Voltages of AC-PDP Using Low Dielectric Constant Layer

In this study, we investigated a method for the usage of the dielectric materials with a small dielectric constant in the front dielectric layer of AC-PDP without the increase of the firing voltage. The firing voltages according to the dielectric constant of the front dielectric layer are calculated quantitatively. The results show the well-known trend that the firing voltage increases as the dielectric constant becomes small. However, it was newly found that the increase of the firing voltage is caused by the shorten lengths of the discharge paths rather than by the weakened strength of the electric field. So we devised a new structure which can make the discharge path longer. The calculation result shows that the firing voltage of the two-layer case with a higher dielectric constant materials (e=12) at the low position and a smaller dielectric constant materials (e=6) at the upper position is about 10V lower than that of the single layer with dielectric materials of the dielectric constant 6.

P-100: Dielectric Property and Hg-Consumption with Glass Tubes of External Electrode Fluorescent Lamp

External electrode fluorescent lamps of aluminosilicate glass with high dielectric constant, a low dielectric loss and a lowest sodium composition were compared with the conventional EEFLs of borosilicate and soda-lime glasses. The luminance efficiency increases by 15∼25 %, the pinhole stability improves remarkably, and the blackening of Hg-consumption is not observed.

A simple ray tracing model for plasma display panel (PDP) cell

Abstract A simple ray tracing model is developed to establish the relationship between the distributions of observed visible light and the excited Xe species in a PDP cell. The ray tracing model can obtain the density distribution of the excited Xe species. It shows the two independent discharge modes created during a single period of sustaining discharge. The maximum density of excited Xe species is located about 148 ? away from the center of the gap between two sustaining electrodes. We also found the loss rate of VUV photons by comparing the luminance profile predicted in our theoretical model from experimental results. According to calculations based on our model, only about 22 percent of the photons can impinge the phosphor layer.

P-80: External Electrode Fluorescent Lamps and Backlight Units for the Large Area of 32″∼42″ LCD-TVs

The commercialized EEFL-BLUs of 32″, 37″, and 42″ LCD-TVs are reported with respect to the basic characteristics of luminance and efficiency. The capacitive and resistive reactance is also presented to design the inverter for lamps and BLUs.

P‐65: Plasma Parameters of Gas Discharge in Cold Cathode Fluorescent Lamps and External Electrode Fluorescent Lamps

From the light propagation observed along the tube of CCFLs and EEFLs, the electron temperature and the plasma density are estimated as kTe∼2 eV and ne∼1016 m−3. This might be a new diagnostic technology to measure the plasma parameters in the fine tube of gas discharge.

Influence of Glass Dielectric Property on the External Electrode Fluorescent Lamps

Influence of glass dielectric property (dielectric constant K, dielectric loss) on the external electrode fluorescent lamps of the dielectric barrier discharge has been investigated with 4-different glasses. Conventional borosilicate glass tubes with

P-84: Electron Plasma Propagation in the External Electrode Fluorescent Lamps

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LCD planar backlight employing the external electrode fluorescent lamps driven by square pulses

The plasma propagation has been investigated by observing the optical signal along the tube of the EEFL for 32″ LCD backlight unit. The light starting from the electrode of high voltage moves toward the other side of electrode grounded electrically with the electron plasma propagation speed about 4×105 m/s.