Hitachi, Ltd.

Hitoshi Oaku

Katsumi Kondo

Masuyuki Ohta

Shigeru Matsuyama

Yasushi Iwakabe

Choichiro Okazaki

Kenji Okishiro

Yasushi Tomioka

Hirotaka Sakuma

Yoshiyuki Umeda

Katsumi Kondou

Ikuo Hiyama

Masatoshi Shiiki

Tomoji Oishi

Hiroyuki Kagawa

Shigeo Amagi

Kotaro Araya

Masaaki Komatsu

Shin Imamura

Yasuo Hanawa

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

An active matrix liquid crystal display device is provided, in which an after image remaining after removing an application of a direct current voltage is suppressed. The active matrix liquid crystal display device has a liquid crystal layer containing a liquid crystal molecule having negative dielectric anisotropy and a dopant having a dissociative group.

Active matrix type liquid crystal display and liquid crystal material

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 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

To provide a high-quality liquid crystal display device that does not produce image sticking and that can realize high response speed, a third electrode is provided that is different from a common electrode or a pixel electrode, and a voltage applied to the third electrode is varied within one frame period to drive a liquid crystal using a strong electric field and a uniform horizontal electric field in an initial stage within one frame period, while driving the liquid crystal only with the uniform horizontal electric field in a latter stage within one frame period.

Liquid crystal display panel, liquid crystal display device, and liquid crystal television

A liquid crystal display device having a pair of substrates, at least one of the substrates being transparent, a liquid crystal layer interposed between the pair of substrates, and pixel electrodes and common electrodes and active elements being arranged on at least one substrate between the pair of substrates. The liquid crystal of the liquid crystal layer is controlled to perform display by applying a voltage between the pixel electrode and the common electrode. An alignment layer is disposed on a surface in contact with the liquid crystal layer of each of the pair of substrates, and the alignment layer is made of an organic polymer selected from the group consisting of polyamic acid group polymers and polyimide ester group polymers having a relative imidization ratio above 60%.

Liquid crystal display device with alignment layer having a relative imidization ratio above 60%

A liquid crystal display device has a pair of substrates, at least one of the substrates being transparent; a liquid crystal layer interposed between the pair of substrates; and pixel electrodes and common electrodes and active elements arranged on at least one substrate between the pair of substrates, wherein a pair of alignment layers are made of an organic polymer of polyamic acid group of polyamide ester group having a relative imidization ration above 60%; or at least one layer of an insulation film is interposed between the alignment layer in a side of the substrate having the group of electrodes formed thereon, and the pixel electrode and the common electrode disposed under the alignment layer to prevent occurrence of the sticking image and the after image by flattening the electrode portions to moderate the electric field concentration.

Liquid crystal display device

In an active matrix type liquid crystal display device using a liquid crystal of negative dielectric anisotropy, low voltage driving and high quality display are made compatible. A liquid crystal display device has: a pair of substrates ; a liquid crystal layer ; a common electrode , a pixel electrode , a signal electrode , and an active element arranged on the substrate so that an electric field parallel to the plane of the substrate is generated by applying a voltage; alignment film formed on the substrate ; and a polarizer ; wherein the liquid crystal of negative dielectric anisotropy containing liquid crystal molecule having dicyanobenzene structure in its molecule structure is used. Within the allowable range, in which the display quality of images of the liquid crystal display device is not lowered, the voltage holding rate is maintained, and low voltage driving becomes possible.

A display device substrate which meets requirements for weight reduction, thickness reduction, high reliability, good heat resistance, and good impact resistance all at once. The display device substrate is composed of a pair of glass sheets facing each other and a layer of plastics material interposed between said paired glass sheets in such a way that said glass sheets have an internal compressive strain ascribed to the plastic sheet. Thus, the very thin glass sheets are hardly liable to breakage. This makes light weight and reduced thickness compatible with reliability.

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Hitachi, Japan

Hitoshi Oaku