Improved discharge characteristics using MgO single‐crystal particles and advanced CEL structure

Abstract

Abstract— Pioneer Corporation introduced plasma‐display‐panel (PDP) TVs in 2005, which achieved the highest dark‐room contrast ratio of 4000:1 at the time. These PDPs had a novel discharge cell structure consisting of a crystal emissive layer (CEL) on a MgO protective thin film. This cell structure is refered to as a CEL structure. Magnesium‐oxide single‐crystal particles, which have a unique luminance peak around 230–250 nm and a good exo‐electron‐emission property, were found to be an excellent material for CEL and were utilized in CEL panels. In 2007, newly developed PDP TVs in which CEL was formed on a phosphor layer, in addition to the previous CEL structure, were introduced, and this discharge cell structure is refered to as advanced CEL structure. By using the new cell structure, the opposed discharge characteristics have been drastically improved, and a stable reset discharge has been realized with only a weak opposed discharge. As a result, black luminance has been drastically reduced, and a dark‐room contrast ratio of over 20,000:1, the highest ever reported, has been achieved.

Surface Morphology, Structural and Optical Properties of MgO Films Obtained by Spray Pyrolysis Technique

“…Such properties allow using this compound as a dielectric material to replace silicon dioxide in some applications [2]. MgO can also be used as a protective layer of plasma display panels to extend the service life of such panels through high durability and improved discharge characteristics [4][5][6]. Magnetic tunnel junctions (MTJ), where MgO is used as a barrier layer, are of great importance not only for the creation of microelectronic and spintronic devices but also to clarify the mechanisms of spin-dependent tunneling of electrons [7].…”

Effect of intensified discharge in the vicinity of ribs on PDP performance

“…Neither of the additional layers was formed by using a typical thick‐film method; preparing the paste, screen‐printing the pattern, and firing. The layer in scheme (a)‐1 is formed of 0.2‐µm‐sized cubic MgO crystal particles and was deposited after the MgO thin film deposition . Meanwhile, those in scheme (a)‐2 and (b) are made of 12‐nm‐sized Al2O3 particles and were deposited before the deposition.…”

“…Apparently, the MgO crystal spacer layer has some advantage in lowering the discharge voltages. It is said that the MgO crystal particles have a high electron emissivity and promote low discharge voltage . In scheme (a)‐1, however, the electron emissivity of the particles has no influence by V f because there is no MgO crystal particle around the X–Y gap.…”

“…As mentioned above, even if the Δ depth of the space is as small as 2 or 3 µm, it makes significant influence on the discharge performance. Incidentally, this value is assumed to be comparable with the maximum or nearly maximum size of the particles that composes the functional layers such as the crystal emissive layers (CEL) . Some of the particles in such a size are to necessarily contact the rib top to consequently deepen the space between the rib and theMgO thin film everywhere on the panel.…”

Simple Model of Bright-room Contrast Ratio Measurement System for Plasma Display Panels with Contrast Enhancement Film

“…Several studies have been conducted on the modeling and simulation of either the discharge characteristics for PDPs [8][9][10][11] or optical characteristics for liquid crystal displays adopting various optical films [12][13][14][15]. However, to the best of our knowledge, the modeling and simulation of the optical characteristics of PDPs, including the BRCR Simple Model of Bright-room Contrast Ratio Measurement System for … -Tae Won Beom et al performance, has not yet been reported.…”