Minsun Yoo

Development of performance- and cost-oriented HD PDP TV with high picture quality using a high-efficiency hexagonal array structure

In this paper, we explained how we developed a 37-in. plasma TV satisfying the major requirements of HDTV. For performance improvement, a HEXA cell structure in delta subpixel array was chosen. To improve picture quality, a subpixel rendering algorithm was added. Finally, to investigate the suitability for a single-scan driver for cost reduction, the discharge characteristics were studied.

P-97: Analysis of Wall-Voltage Variation During Address Period Using V(t) Closed Curves

To explain a non-uniformity of the address discharge during an address period, the wall voltage variation during an address period was investigated as a function of the number of the applied address pulse by the Vt closed curve. It was observed that the wall voltage between the scan and address electrodes was decreased with an increase in the number of the applied address pulse. It was also observed that the wall voltage variation during an address period strongly depends on the voltage difference between the Y and A electrodes.

P-82: Expectation of Luminous Efficacy of Ultra Fine Discharge Cells Using 2D-Simulator

It has been suggested that a 50-inch full HD class is the most ideal display device for digital broadcasting. One of the problems accompanied by the decrease of cell size is the reduction of luminous efficacy. This paper discusses difficulty of designing fine discharge cells and the influence of cell size reduction on the luminous efficacy is investigated using 2-dimensional simulation. The calculated results are verified by the experimental data obtained from 6-inch test panels with various pitches. It is found that in ultra fine discharge cells the luminous efficacy can be enhanced adopting high xenon operation along with high frequency driving.

12.1: Invited Paper: Performance- and Cost- Oriented Full-HD PDPs with High-Picture Quality for 42 in. or Smaller Sizes

The experience of developing 768/p PDPs in near 42 inches has encouraged industry to bring larger 1080/p applications to market. In the meantime, the efforts to realize 1080/p PDPs in near 42 inches may pave the way to empower the market competitiveness for 768/p applications in same size. It should take for a while to realize a moderately priced 1080/p PDP in 42 inches with high- performance and picture quality at the same time. However, candidate technology can also upgrade 768/p PDPs in near 42 inches progressively with exceptionally innovative engines. In another words, PDP business can still take benefit out of rapidly growing HDTV market by selling 768/p PDPs until timely introducing 1080/p products in 42 inches or smaller.

12.4: A Study on Full-High-Definition PDPs of under 50 in.

A method for realizing FHD PDPs of under 50 inches is proposed. We analyzed various arrangements of PDP. A Resolution-Efficient Delta (RED) arrangement is proposed. This elongates the gap between address lines. Using this, we could create 42-inch full HD class PDPs. The principal problem with this RED was image quality. We discovered what cause image deterioration and eliminated it.

P‐140: A Modified Selective Reset‐Waveform to Minimize Wall‐Voltage Variation During Address‐Period in Full‐HD PDP

This paper proposes a modified selective reset driving waveform that can lower the potential difference between the scan and address electrodes by applying the address-bias voltage (Va-bias) to the address electrode during the application of the rising pulse of Y-electrode in the selective reset-period. This address-bias voltage (Va-bias) plays a role in suppressing the wall-charge accumulation on the address electrode during the selective reset-period, thereby contributing to minimizing the wall-voltage variation during the address-period and as such allowing the higher voltage difference (=ΔVy) between the scan low voltage (Vsl) and the negative falling ramp voltage (Vnf) during an address-period without any misfiring discharge. When adopting the proposed selective reset waveform, the address discharge delay time is observed to be reduced by about 120 ns.

P‐135: Analysis on Sustain‐Waveform Distortion Induced by Display‐Pattern Type in AC‐Plasma Display Panel

The sustain waveforms are distorted relative to the displayed area. The sustain waveforms are distorted relative to the displayed area, which causes the variations in luminance and luminous efficiency. It is found that the constant rising slope of the displayed are causes the sustain waveform distortion. A discharge in a cell has voltage-current (V-I) characteristics that the applied voltage waveform determines the discharge current. A circuit also has V-I characteristics that the total current of all cells determines the voltage waveforms applied to cells. Furthermore, the Y and X electrode have resistance and belong to cells aligned horizontally, accordingly, the number of on-cells in horizontal line distorts the voltage applied to each cell. This paper shows by analysis and experiments that the applied voltage and the luminance and the luminous efficiency of an AC-PDP cell are affected by the amount and distribution of displayed area.

P-95: Distortion of Sustain Waveform Relative to Displayed Area and Its Compensation for Stable Address Discharge in AC-Plasma Display Panel

The sustain waveforms are distorted relative to the displayed area. The distorted sustain waveform, especially the last X sustain waveform causes the address time to be delayed. Accordingly, to produce a stable address discharge irrespective of the displayed area, the sustain waveform, especially the last X sustain waveform prior to the selective reset waveform, is compensated by making its rising slope faster in proportion to the displayed area by means of controlling the timing sequence of the energy recovery circuit (ERC) circuit. As a result, the compensated sustain waveform enables the address delayed time to be saturated irrespective of the displayed area.

32.3: Distinguished Student Paper: High Efficiency Hybrid PDP

In order to increase the effective yield of secondary electron emission from MgO protective layer, we used carbon nanotubes (CNTs) as a supplementary electron source for plasma discharge of PDP. CNTs were planted on the surface of transparent dielectric layer and coated with MgO in order to induce field emission of electrons under electric field formed during operation of PDP. Luminance and luminance efficiency of the panel with the CNTs were increased significantly, demonstrating a possibility of hybrid PDPs.