Plasma Display Materials
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Plasma Display Materials
Kinzo Nonomura, Hidetaka Higashino, and Ryuichi Murai Abstract Recent trends in the development of plasma display panels (PDPs) are reviewed in this article with special emphasis on materials. New developments in the panel structure, discharge gases and phosphors used, and drive methods have improved many of the display characteristics over a wide range of operating conditions. As a result, much progress has been seen in large-scale panel development; for example, 50-in. and 61-in. PDPs have been commercialized. Improvements in phosphor longevity, discharge gas efficiency, and characteristics of the protective layers can be attributed in part to materials solutions. The longevity of the blue phosphor has been improved by the development of new materials and a greater understanding of the phosphor deterioration mechanism. The luminous efficiency has been greatly increased by the use of highdensity Xe gas. The protective-layer characteristics have been improved as a result of advancements in processes, materials, and analytical methods. Keywords: flat-panel displays, phosphors, plasma display panels (PDPs), Xe gas.
Introduction Recently, much has been expected from plasma display panels (PDPs) for largesized displays. Compared with CRTs (cathode-ray tubes), PDPs not only have made thinner and larger displays possible, but they have also achieved almost the same picture quality (e.g., brightness and contrast) as CRTs. Three major objectives remain for PDPs: to lower their cost, lower their power consumption, and improve their picture quality further. Researchers in various fields have taken great strides in solving these problems.1,2 At one time, 37-in. and 42-in. panels were the staple of PDPs, but today, 50-in. and 61-in. panels are also being produced. As a whole, technical developments are focused on optimizing the panel structure for higher luminance; achieving higher definition; reducing cost and power consumption; improving the discharge gases to achieve higher luminance and higher efficiency; increasing the longevity of phosphors; reducing the phosphor decay time; and introducing a new drive method. Parallel to these efforts, a study was done on the characteristics that would improve the protective MgO layer to achieve more stable and efficient discharge. This article will explain these developments.3–5
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Structure and Theory of Operation of PDPs The PDP panel structure is simple. Shown in Figure 1 is a schematic illustration of the structure. It consists of front and rear plates with discharge gases
sealed between them. On the glass substrate of the front plate is a pair of transparent electrodes and a bus electrode, covered by a transparent dielectric layer that is applied using low-melting-point glass frit and a protective MgO layer that is deposited by an evaporation technique. On the rear plate, the glass substrate is covered with a thin electrode and a dielectric layer. On top of this are the barrier ribs, which are designed to prevent diffusion of phosphors and discharge
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