Nec Corporation

Nec Lcd Technologies, Ltd.

Eriko Fujimaki

Shinichi Nishida

Makoto Watanabe

Hidenori Ikeno

Masayoshi Suzuki

Teruaki Suzuki

Yoshihiko Hirai

Kimikazu Matsumoto

Hiroaki Matsuyama

Sounosuke Takahashi

Kunimasa Itakura

Yuji Yamamoto

Muneo Maruyama

Toshiaki Ishiyama

Within a reflective display section R, a part of a light that reaches a reflective electrode through a color filter exits to the outside through slits and a part of a light that reaches the reflective electrode through the slits exits to the outside through the color filter. In addition, a light reaching the reflective electrode through the color filter and exiting to the outside through the color filter, and a light having no opportunity to pass through the slits also can be observed. Therefore, a mean film thickness of color filter through which all lights pass during the time in which they travel the associated distance after they are inputted to the inside until they are outputted to the outside becomes nearly equal to that could be observed in the transmissive section T.

Method of manufacturing a color liquid crystal panel

Color liquid crystal panel, method for manufacturing the same, and color liquid crystal display device employing the same

Disclosed is an in-plane switching active matrix type liquid crystal display with greater improvements on color shifting and contrast. The liquid crystal display comprises an in-plane switching type liquid crystal display panel having an active device substrate, an opposing substrate and a liquid crystal layer held sandwiched between the active device substrate and the opposing substrate, a first polarizer laid out on one side of the liquid crystal display panel, a second polarizer laid out on the opposite side of the liquid crystal display panel, first to third optical compensators placed in order between the liquid crystal display panel and the first polarizer, and a fourth optical compensator placed between the liquid crystal display panel and the second polarizer. As the first to fourth optical compensators are provided to compensate for retardation of the liquid crystal layer and retardation of the polarizers, black stretching does not occur even when observation is made from any viewing angle, and a reduction in contrast does not occur. Nor does color shifting occur at the time of displaying black.

Active matrix type liquid crystal display

A color filter substrate C includes an orientation filmprovided on one surface of another glass substrateand an optical compensation layerprovided on the other surface of the glass substrateand formed from a plastic film. The two substrates are disposed such that the orientation films thereof oppose each other, and polarization platesandare disposed on the outer sides of the two substrates, and a liquid crystal layerhaving a positive refractive index anisotropy is provided between the orientation films. The optical compensation layerhas a negative one axial refractive index anisotropy and can cancel a retardation produced in the liquid crystal layerthereby to suppress white floating of a black display portion.

Transverse electric field active matrix liquid crystal display panel having particular optical compensation layer

Active matrix in-plane switching type liquid crystal display and compensator arrangement

Color liquid crystal panel having opening in color filter varied according to color, method for manufacturing the same, and color liquid crystal display device employing the same

An active matrix liquid crystal display panel by which a good display characteristic can be obtained without suffering from gradation reversal over a wide visibility angle range. A liquid crystal layeris formed such that the thickness thereof varies in accordance with transmission wavelengths of color layersandso that a very good display which does not exhibit any coloring in whichever direction it is viewed may be obtained. An active matrix substrate A includes a plurality of opposing electrodes, a plurality of pixel electrodesparallel to the opposing electrodes, a thin film transistor, and an orientation filmall formed on a glass substrate. A color filter substrate C includes an orientation filmprovided on one surface of another glass substrateand an optical compensation layerprovided on the other surface of the glass substrateand formed from a plastic film. The two substrates are disposed such that the orientation films thereof oppose each other, and polarization platesandare disposed on the outer sides of the two substrates, and a liquid crystal layerhaving a positive refractive index anisotropy is provided between the orientation films. The optical compensation layerhas a negative one axial refractive index anisotropy and can cancel a retardation produced in the liquid crystal layerthereby to suppress white floating of a black display portion.

Active matrix liquid crystal display panel having particular optical compensation layer

A LCD device prevents the color irregularities (e.g., the red-color irregularity) from occurring without complicating the fabrication processes of a color filter. Switching elements are formed on a first substrate. A color layer is formed on a second substrate. The color layer has a red sublayer, a green sublayer, and a blue sublayer. A liquid-crystal layer is located between the first and second substrates. The second substrate includes no electrodes formed in such a way as to be located on a side nearer to the liquid-crystal layer with respect to the color layer. A green-coloring composition forming the green sublayer contains a pigment having a copper phthalocyanine skeleton. A ratio in weight of the pigment with respect to the green-coloring composition is equal to or less than approximately 27%.

Method of fabricating and evaluating liquid-crystal display

A LCD device prevents the color irregularities (e.g., the red-color irregularity) from occurring without complicating the fabrication processes of a color filter. Switching elements are formed on a first substrate. A color layer is formed on a second substrate. The color layer has a red sublayer, a green sublayer, and a blue sublayer. A liquid-crystal layer is located between the first and second substrates The second substrate includes no electrodes formed in such a way as to be located on a side nearer to the liquid-crystal layer with respect to the color layer. A green-coloring composition forming the green sublayer contains a pigment having a copper phthalocyanine skeleton. A ratio in weight of the pigment with respect to the green-coloring composition is equal to or less than approximately 27%.

Liquid-crystal display device

Active matrix liquid crystal display panel

An active matrix liquid crystal display panel by which a good display characteristic can be obtained without suffering from gradation reversal over a wide visibility angle range. A liquid crystal layeris formed such that the thickness thereof varies in accordance with transmission wavelengths of color layersandso that a very good display which does not exhibit any coloring in whichever direction it is viewed may be obtained. An active matrix substrate A includes a plurality of opposing electrodesa plurality of pixel electrodesparallel to the opposing electrodesa thin film transistor, and an orientation filmall formed on a glass substrateA color filter substrate C includes an orientation filmprovided on one surface of another glass substrateand an optical compensation layerprovided on the other surface of the glass substrateand formed from a plastic film. The two substrates are disposed such that the orientation films thereof oppose each other, and polarization platesandare disposed on the outer sides of the two substrates, and a liquid crystal layerhaving a positive refractive index anisotropy is provided between the orientation filmsThe optical compensation layerhas a negative one axial refractive index anisotropy and can cancel a retardation produced in the liquid crystal layerthereby to suppress white floating of a black display portion.

In a liquid crystal display device comprising first and second substrates having first and second principal surfaces which are opposed to each other with a space left therebetween, first and second alignment layers are formed on the first and the second principal surfaces of the first and the second substrates. The first alignment layer is subjected to a first aligning treatment in a first aligning treatment direction while a second alignment layer is subjected to a second aligning treatment in a second aligning treatment direction which shifts from the first aligning treatment direction by a predetermined slight angle. Interposed between the first and the second alignment layers, a liquid crystal layer comprises a plurality of liquid crystal molecules each of which is twist aligned by a twist angle equal to the predetermined slight angle.

Liquid crystal display device having characteristic of viewing angle which is right-and-left symmetrical and up-and-down symmetrical

A liquid crystal panel has a cholesteric filter and the quarter wave plate inserted between a glass substrate and color filter elements, and each section of the cholesteric filter reflects either right-handed or left-handed circularly polarized light component recognized as one of the three primary colors and the circularly polarized light components recognized as other primary colors toward a light source so as to recycle these circularly polarized light components, thereby enhancing the utilization factor of incident light without increase of power consumption.

Growing community of inventors

Tokyo, Japan

Eriko Fujimaki