Hitachi, Ltd.

Choichiro Okazaki

Masatoshi Shiiki

Teruki Suzuki

Keizo Suzuki

Hitoshi Oaku

Masaaki Komatsu

Shin Imamura

Tadashi Furukawa

Tatsuya Miyake

Masaji Ishigaki

Hirotaka Sakuma

Hiromichi Yamada

Tsuyoshi Fujita

Kenichi Yamamoto

Kenji Okishiro

Seiichi Tsuchida

There is provided a plasma display panel device using phosphors to improve reliability and color reproductivity or color performance. A plasma display panel includes: a discharge gas for generating ultraviolet light as a result of electric discharge, and a phosphor layer containing a phosphor for emitting light as a result of excitation by the ultraviolet light, in which the phosphor contains an Eu activated silicate phosphor added with at least one element selected from Al, Ga, Y and Gd, represented by the following General Formula (1):M1M2SiO:Eu&#x2003;&#x2003;(1)

Plasma display device

A high-luminance plasma display panel has a plurality of discharge cells including a phosphor film emitting visible rays by excitation caused by ultraviolet light generated by the discharge of a discharge gas. The phosphor film has at least two layers of a phosphor layer and a reflecting layer, and the phosphor layer is arranged closer to the discharge space side than the reflecting layer. A film thickness Wt of the phosphor film is 40 &#x3bc;m or less, and a film thickness Wp of the phosphor layer, a particle diameter dp of a phosphor that is at least a part of components of the phosphor layer, a film thickness Wr of the reflecting layer, and a particle diameter dr of a reflecting material that is at least a part of components of the reflecting layer satisfy 2dp&#x2266;Wp&#x2266;5dp and 2dr&#x2266;Wr&#x2266;Wt&#x2212;Wp.

Plasma display panel and plasma display apparatus using the same

A plasma display device comprising phosphor layer wherein the phosphor layer comprises blue-emission divalent europium activated alkaline earth silicate phosphor which is represented by the following compositional formula (Ae)(Ae')SiO:Eu, wherein x satisfies 0.01&#x2266;x&#x2266;0.1, Ae is at least one alkaline earth element selected from the group consisting of Sr, Ca, and Ba, and Ae&#x2032; is at least one element selected from the group consisting of Zn or (Zn plus Mg).

Plasma display device, luminescent device and image and information display system using the same

Using Euas the luminescence center for a green-emitting phosphor, a plasma display panel and a PDP device using it are configured by using an Eu-activated silicate green-emitting phosphate (CaM1).M2.SiO:Euwith improved decay characteristics. In the formula, M1 is at least one element selected from the group containing Sr and Ba; M2 is at least one element selected from the group containing Mg and Zn; and x indicates the mole fraction of the component M1 and e indicates the mole fraction of Eu respectively satisfy the following conditions: 0&#x3c;x&#x3c;1 and 0.001&#x2266;e&#x2266;0.2.

Plasma display with a novel green-silicate phosphor

A plasma display panel has plural discharge cells between two opposing first and second substrates. Each of the discharge cells includes at least one pair of electrodes for generating a discharge for display, a discharge gas and a phosphor film for emitting visible light by being excited by ultraviolet rays produced by the discharge of the discharge gas. Laminated members are dispersed in a plane within each of the discharge cells inside the first substrate from which visible light for display is emitted, and each of the laminated members includes a light absorption layer disposed on a side of the first substrate on which ambient light is incident and a light reflection layer disposed on a phosphor-film side of the laminated members. A visible-light-reflection layer is disposed on a surface of the phosphor film on a side thereof opposite from a space in which the discharge is generated.

Plasma display panel having laminated members and visible light reflection layer

A plasma display panel has plurality discharge cells disposed between a pair of opposing first and second substrates. Each of the discharge cells includes at least: at least one pair of electrodes for generating a discharge for display; a discharge gas; and a phosphor film for emitting visible light by being excited by ultraviolet light produced by the discharge of the discharge gas. Laminated members are dispersed in a plane within each of the discharge cells inside the first substrate from which visible light for display is emitted. Each of the laminated members includes a light absorption layer disposed on a side of the first substrate on which ambient light is incident and a light reflection layer disposed on a phosphor-film side of each of the laminated members.

Plasma display panels and plasma display devices which use the panel

A blue-emitting phosphor is optimized by controlling mole fractions typically of Mg and Si in SrMgSicO:Euor by further including an optimal amount of at least one additional component such as Ba or Ca. The resulting phosphor exhibits a higher brightness and a higher color purity upon excitation by ultraviolet light emitted as a result of discharge of xenon gas. The optimized phosphor is incorporated into light emitting devices such as lamps and PDPs, and further into display devices.

Light emitting device

The present invention provides a plasma display device, a luminescent device, and an image display system each having an excellent moving-image quality, a long lifetime, and high performance. The plasma display device has a plasma display panel having at least a pair of substrates, a discharge gas space formed between the pair of substrates, electrodes formed on the respective opposing surfaces of the substrates, and a phosphor layer formed on the surface of one of the pair of substrates in contact with the discharge gas space and a driver circuit for driving the panel via the electrodes. In the plasma display device, the decay time ( 1/10 decay time) of light generated from each of the phosphor layers for providing red, green, and blue emission which compose the phosphor layer is not more than 8 ms. The plasma display device and the luminescent device use a blue phosphor (a divalent europium activated alkali earth silicate phosphor) having high performance under excitation caused by a vacuum UV beam and a low-speed electron beam and a composition represented by the following compositional formula:(Ae)(Ae')SiO:Eu.

The luminance of phosphor is enhanced by forming a phosphor screen of a fluorescence generation unit by phosphor expressed by the following composition formula: (LGdCe)(AlGa)O:Mwherein, a, b and c are each in the following ranges of 0&#x2266;a&#x2266;1.0, 0&#x3c;b&#x2266;0.1 and 0&#x2266;c&#x2266;1.0, M is dopant of a monovalent metal element and is included in phosphor by approximately 0&#x3c;d&#x2266;1000 wt-ppm. Dopant M of a monovalent metal element is at least one type of element selected from a group consisting of K, Na, Li, Cu, Ag and Au. Thus, a display using a white light of improved luminescence and having excellent characteristics can be realized.

Light source and display using the same

A plasma display includes a display panel and a driving circuit for driving the display panel. A space for at least one color, of spaces between barrier ribs for defining discharge spaces for red, green and blue colors of the display panel is different from the spaces for other colors.

Adjustment of luminance balance of red, green and blue light emissions for plasma display by using different sized areas of phosphor layers producing corresponding colors

A white light source includes an ultraviolet-visible excitation light generation unit capable of generating visible light and ultraviolet light, and a fluorescence generation unit having a phosphor layer and being capable of generating visible light upon excitation by the ultraviolet light and uses, in the phosphor layer, a red light emitting phosphor represented by the following compositional formula: (Ca Sr Eu )S:M , wherein a, b and c satisfy the following conditions: 0&lE;a<1.0, 0&lE;b<0.1 and 0&lE;c&lE;0.1; and M is a dopant element having absorption of excitation energy at about 350 nm to about 500 nm. The dopant element M includes rare earth elements such as Ce, Yb, Gd and Tm. By substituting part of Ca and/or Sr with Zn, the white light source can exhibit further improved performances. The white light source exhibits an increased red light component as compared with light emitted from conventional (Y Gd Ce ) (Al Ga ) O green light phosphors and is suitably used in display apparatus.

White light source and display apparatus using the same

Phosphor and display device or light source using the same

Rare earth phospho-vandate phosphors containing at least one element of Group IV of the periodic table have spherical or cubic shaped particles and provide higher brightness and longer brightness life, and effective for use in display systems and light emitting systems.

Growing community of inventors

Kodaira, Japan

Choichiro Okazaki