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ABSTRACT: Performances of microplasmas in unit discharge cells with grooved structures in the dielectric layer covering the coplanar electrodes were investigated in alternating current (ac)-type plasma display panels filled with Ne-Xe(10%) mixture at 450 torr. The diagnostics are based on a microscopic laser-absorption spectroscopy technique for the spatiotemporally resolved measurements of absolute densities of Xe<sup>*</sup>(1s<sub>5</sub>,1s<sub>4</sub>) atoms, from which the production rate and the efficiency of the vacuum ultraviolet photons were estimated. These results were compared with previously reported data obtained in conventional phosphor coated panels with the same structures for the dependences on the applied sustain voltages. As the result, the following conclusions were ascertained. The grooved structure does not help to improve the luminous efficiency but it helps to lower the firing and sustaining voltages by about 20 V if the electrode gap is kept constant. Therefore, it provides additional possibilities for the selection of other operating conditions such as the gas composition and pressure for the improvements of the luminance and the luminous efficiency.
IEEE Transactions on Plasma Science 05/2006; · 1.17 Impact Factor
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ABSTRACT: This paper proposes a highly efficient cross-shaped cell structure to improve the luminous efficiency of an alternate current plasma display panel (ac-PDP). The microdischarge characteristics of the proposed structure are examined in an all-green 6-in test panel with various pressures and Xe-concentrations. Since the proposed cross-shaped cell structure has a longer Indium Tin Oxide (ITO) path between the two sustain electrodes and wider sidewall phosphor area, the following microdischarge characteristics were observed when compared with the conventional stripe-type cell structure. First, the sustain voltage margin was lower by about 15 V under a high Xe-concentration of 10%. Second, the rate of increase in the luminous efficiency was higher with a high pressure and high Xe-concentration. Finally, when adopting an auxiliary address pulse driving scheme, the luminous efficiency was improved by about 44% (2.38 lm/W) with a high Xe-concentration of 10%.
IEEE Transactions on Plasma Science 07/2005; · 1.17 Impact Factor
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ABSTRACT: The itinerant strong sustain discharge that occurs during a sustain period over a few minutes causes image sticking, which means a ghost image remains in the subsequent image when the previous image was continuously displayed over a few minutes. Accordingly, this paper investigates whether the dominant factor in image sticking is the MgO surface or phosphor layer by testing the effects of image sticking in subsequent dark and bright images using a 42-in plasma display panel. When the subsequent image was dark, the image sticking was found to produce a brighter ghost image than the background. Thus, since the luminance of a dark image is produced by the weak discharge that occurs during the reset-period, the higher luminance of the ghost image was mainly due to the activation of the MgO surface. Conversely, when the subsequent image was bright, the image sticking was found to produce a darker ghost image than the background. Thus, since the luminance of a bright image is predominantly produced by the strong discharge that occurs during the sustain period, the lower luminance of the ghost image was mainly due to the deterioration of the phosphor layer.
IEEE Transactions on Plasma Science 01/2005; · 1.17 Impact Factor
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ABSTRACT: This paper presents a new driving scheme based on the algorithm for the selection of the optimum auxiliary pulse to reduce the deviation of white color in an AC plasma display panel television (PDP-TV). The luminance ratio among the red, green, and blue lights can be controlled independently by applying the different auxiliary address pulses to the red, green, and blue cells during a sustain-period. As a result, white colors of eight subfields can be clustered within a region, which is not resolvable in terms of visual perception.
IEEE Transactions on Consumer Electronics 09/2002; · 0.94 Impact Factor
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ABSTRACT: This paper presents a new driving scheme for improving the color
temperature of plasma display panel-televisions (PDP-TVs). Auxiliary
address pulses, plus sustain pulses applied to sustain electrodes, are
applied only to address electrodes with blue phosphor layers during a
sustain-period, thereby resulting in increasing the luminance of blue
cells among the red, green, and blue cells. When compared with the
conventional driving scheme, the proposed driving scheme can improve the
color temperature of PDP-TVs without reducing the luminance
IEEE Transactions on Consumer Electronics 09/2001; · 0.94 Impact Factor
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ABSTRACT: This paper proposes a new sustain waveform to improve the luminous
efficiency of an AC plasma display panel (AC-PDP). The new sustain
waveform is a superimposed waveform, which adds a ramp-waveform to a
square-waveform, and has an increasing voltage slope between the rising
and falling edge. This waveform can induce a longer-sustained discharge
at the rising edge plus a self-erasing discharge at the falling edge,
thereby improving the luminous efficiency, When compared with the
conventional square sustain waveform, the proposed sustain waveform with
a 9.3 V/μs voltage slope achieved a 65% higher luminous efficiency in
a 4-in AC-PDP test panel even at a low frequency (62 kHz)
IEEE Transactions on Electron Devices 08/2001; · 2.32 Impact Factor
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ABSTRACT: A new driving-scheme for improving the color temperature of plasma display panel-HDTV is proposed. Auxiliary pulses are only applied to address electrodes with blue phosphor layers during a sustain-period, thereby improving the color temperature of plasma display panel-HDTV
Consumer Electronics, 2001. ICCE. International Conference on; 02/2001
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ABSTRACT: This study uses helium and xenon gas mixture discharges to determine the effects of helium plasma emission on the characteristics of the visible emission from the stimulation of the red, green, and blue (RGB) phosphor layers in a surface-type alternate current plasma display panel. With a mixture of less than 2% xenon to helium, it was found that the luminance of the RGB phosphor layers decreases with a decrease in the helium plasma emission intensity. However, with a mixture of above 2% xenon to helium, the luminance of the RGB phosphor layers increases regardless of a decrease in the helium plasma emission intensity. Furthermore, the color purity of the RGB phosphor layers improves as the helium plasma emission intensity decreases. Accordingly, it can be concluded that the optical properties of the phosphor layers, including color purity and luminance, depend on the helium plasma discharge emission as well as the visible emission from the stimulation of the phosphor layers. © 2000 American Institute of Physics.
Journal of Applied Physics 02/2000; 87(5):2073-2075. · 2.17 Impact Factor
