Panasonic Corporation

Yusuke Fukui

Mikihiko Nishitani

Masaharu Terauchi

Takuji Tsujita

Michiko Okafuji

Yasuhiro Yamauchi

Masahiro Sakai

Hiroshi Asano

Yosuke Honda

Mitsuhiro Murata

Osamu Inoue

Jun Hashimoto

Shinichiro Ishino

Kaname Mizokami

Keisuke Okada

Toshikazu Wakabayashi

Hikaru Nishitani

The present invention is a method of producing an ultraviolet light emitting phosphor material. This method includes a step of heat-treating a composition containing zinc and oxygen as main components and at least one selected from the group consisting of aluminum, gallium and indium as a sub-component, in the presence of at least two coexisting substances selected from the group consisting of zinc oxide, gallium oxide and phosphorus oxide under a non-oxidizing atmosphere.

Method of producing ultraviolet light emitting phosphor material

Protective layer () of front plate () of a plasma display panel has base protective layer () and particle layer (). Base protective layer () is formed of a thin film of metal oxide containing at least one of magnesium oxide, strontium oxide, calcium oxide, and barium oxide. Particle layer () is formed by sticking, to base protective layer (), single crystal particles () of magnesium oxide having an NaCl crystal structure that is surrounded by a specified two-type orientation face formed of (100) face and (111) face or a specified three-type orientation face formed of (100) face, (110) face, and (111) face. The panel driving circuit drives the panel while temporally disposing the subfields so that the luminance weight monotonically decreases from a subfield in which an all-cell initializing operation is performed to the subfield immediately before the subfield in which its next all-cell initializing operation is performed.

Method of driving a plasma display panel to compensate for the increase in the discharge delay time as the number of sustain pulses increases

Provided is a manufacturing method that allows even a PDP having high-definition cells to exhibit excellent image display performance with reduced power consumption by effectively preventing impurities from adhering to the protective layer. Specifically, in a pre-baking step, a back substrateis baked at a pre-baking temperature. Here, a highest pre-baking temperature is set to be lower than a softening point of a sealing material. The back substrateis superposed on a front substrate. Then, a sealing step is performed in a sealing atmosphere prepared by mixing a predetermined amount of a reducing gas with a non-oxidizing gas. The above enables the impurities attributed to organic components due to a sealing material paste to remain as low molecular components, whereby the impurities are evacuated and removed in an evacuating step performed after the sealing step. This prevents adherence of the impurities to the protective layer

Method for producing plasma display panel

The present invention improves discharge characteristics of a protective layer in order to provide a PDP that exhibits excellent display performance even if the PDP is of a fine-cell structure. The present invention also provides a manufacturing method for the PDP. In particular, a protective layeris composed of an MgO film layerand an MgO particle layerthat is made of MgO particles. The MgO particlesare formed by burning an MgO precursor and satisfy that a/b&#x2267;1.2, where a denotes a spectrum integral value in a wavelength region of a CL spectrum from 650 nm to 900 nm, exclusive of 900 nm, and b denotes a spectrum integral value in a wavelength region of the CL spectrum from 300 nm to 550 nm, exclusive of 550 nm.

Plasma display panel with exposed crystal particles and manufacturing method thereof

'Discharge delay' and 'dependence of discharge delay on temperatures' are solved by improving a protective layer, thus a PDP can be driven at a low voltage. Furthermore, the PDP can display excellent images by suppressing &#x201c;dependence of discharge delay on space charges.&#x201d; Liquid-phase magnesium alkoxide (Mg(OR)) or acetylacetone magnesium ate whose purity is 99.95% or more is prepared, and is hydrolyzed by adding a small amount of acids to the solution. Thus, a gel of magnesium hydroxide that is a magnesium oxide precursor is formed. Burning the gel in atmosphere at 700&#xb0; C. or more produces powder containing MgO particles-having the NaCl crystal structure with (100) and (111) crystal faces or with (100), (110) and (111) crystal faces. By pasting the powder on a dielectric layeror a surface layer, the MgO powderis formed so as to serve as the protective layer.

Plasma display panel and method for manufacturing the same

A first aim of the present invention is to provide a PDP capable of stably delivering favorable image display performance and being driven with low power, by improving the surface layer to improve secondary electron emission characteristics and charge retention characteristics. A second aim of the present invention is to provide a PDP, in addition to having the above-mentioned effects, capable of reducing an aging time. In order to achieve these aims, a crystalline film of a film thickness of approximately 1 &#x3bc;m is disposed as a surface layer (protective film)on a surface of the dielectric layerthat faces a discharge space. The surface layeris made by adding Sr to CeO, and a concentration of Sr in the surface layeris in a range of 11.8 mol % to 49.4 mol % inclusive. With this structure, an attempt is made to improve the secondary electron emission characteristics and aging characteristics in the surface layer

Plasma display panel

A PDP can be driven at low voltage while having a charge retention property in a protection layer, and has favorable image display properties. Additionally, the PDP prevents the occurrence of discharge delay and realizes high-quality image display by performing favorable high-speed driving in a high definition PDP. To achieve this, a surface layer () is formed to a film thickness of 1 &#x3bc;m in an oxygen atmosphere having an oxygen partial pressure of 0.025 Pa or more, the surface layer () is provided on a face of a dielectric layer () on a discharge space side. Furthermore, MgO particles () are dispersed on a surface of the surface layer (). The surface layer () has the effects of protecting the dielectric layer () from ion bombardment during discharge, reducing the firing voltage, and preventing excessive electron loss. Also, the MgO particles () have a high initial electron emission property.

Plasma display panel and its manufacturing method

The present invention improves discharge characteristics of a protective layer in order to provide a PDP that exhibits excellent display performance even if the PDP is of a fine-cell structure. The present invention also provides a manufacturing method for the PDP. In particular, a protective layeris composed of an MgO film layerand an MgO particle layerthat is made of MgO particles. The MgO particlesare formed by burning an MgO precursor and satisfy that a/b&#x2267;1, where a denotes a spectrum integral value in a wavelength region of a CL spectrum from 200 nm to 300 nm, exclusive of 300 nm, and b denotes a spectrum integral value in a wavelength region of the CL spectrum from 300 nm to 550 nm, exclusive of 550 nm.

Plasma display panel and method for manufacture of the same

The present invention provides a plasma display panel (PDP) with a protective film improved so as to achieve a lower discharge starting voltage. A surface portion of the protective filmsubstantially is composed of magnesium (Mg), aluminum (Al), nitrogen (N), and oxygen (O). The protective filmis formed so that in the surface portion of the protective film, a ratio of the number of atoms of the aluminum to a total of the number of atoms of the magnesium and the number of atoms of the aluminum is at least 2.1% but not more than 66.5%, a ratio of the number of atoms of the nitrogen to a total of the number of atoms of the nitrogen and the number of atoms of the oxygen is at least 1.2% but not more than 17.2%, and a ratio of the total of the number of atoms of the nitrogen and the number of atoms of the oxygen to the total of the number of atoms of the magnesium and the number of atoms of the aluminum is at least 1.0 but not more than 1.35.

Growing community of inventors

Osaka, Japan

Yusuke Fukui