Nec Corporation

Nec Lcd Technologies, Ltd.

Hirofumi Ihara

Takahiko Watanabe

Shinichi Nakata

Michiaki Sakamoto

Yuji Yamamoto

Hironori Kikkawa

Mamoru Okamoto

Osamu Sukegawa

Wakahiko Kaneko

Hiroyuki Uchida

Hiroaki Tanaka

Shigeru Kimura

Kazushige Takechi

Tsutomu Hamada

Akitoshi Maeda

Shusaku Kido

Takasuke Hayase

Satoshi Ihida

Satoshi Doi

Seiichi Matsumoto

Shouichi Kuroha

Tae Yoshikawa

Toshihiko Harano

Hisanobu Shimodouzono

Masayoshi Suzuki

Teruaki Suzuki

Hiroshi Kanoh

Toshiya Ishii

Hiroaki Matsuyama

Susumu Ohi

Muneo Maruyama

Shin Koide

Kohji Nakashima

Takayasu Iida

In a liquid crystal display device comprising a first substratehaving a color filter, a second substrateand a liquid crystal layer disposed therebetween, a color filter layeris disposed on a protection filmof a thin film transistor formed on the first substrateso as to be partitioned by a light shielding portion, and a common electrodeis disposed thereon. A pixel electrode to be connected to a source electrodeis disposed through a through hole formed in an overcoat layer (interlayer separation film). On the first substrate below the color filter layerare provided plural scan signal electrodes, plural video signal electrodes crossing the scan signal electrodes in a matrix form, plural thin film transistors formed in association with the crossing points between the electrodes. Each pixel is provided with a common electrodewhich is connected over plural pixels through a common electrode wire to supply reference potential, and a pixel electrodewhich is connected to the corresponding thin film transistor and disposed so as to confront the common electrode in the pixel area.

Liquid crystal display device and method of manufacturing the same

A liquid crystal display device includes first and second electrodes and an insulating film. The first electrode is formed on a substrate as one of two electrodes of an accumulation capacitor and applied with a voltage. The insulating film is formed on the first electrode to cover the first electrode. The second electrode is formed on the first electrode via the insulating film as the other electrode of the accumulation capacitor and including a first conductive film and a second conductive film formed on the first conductive film.

Liquid crystal display device with less pixel error and method of manufacturing the same

A liquid-crystal display device is provided wherein large electrostatic capacitance can be obtained without exposure of a metal film on a surface of a TFT array substrate, and yield in production and stability in images are improved. In the liquid-crystal display device of the present invention, a thin-film transistor section is mounted which is used to selectively connect either of a data wiring formed on a gate insulating film or a transparent electrode by a gate connected to an address wiring placed in each of picture element areas. In each of picture element areas, a capacitor section is formed with a first electrode formed, on the gate insulating film, using the same conductive film as used for the data wiring and a second electrode formed, on an upper layer insulating film formed on the gate insulating film, using the same transparent conductive film as used for a transparent electrode.

Liquid-crystal display device and method for production thereof

An active matrix substrate plate having superior properties is manufactured at high yield using four photolithographic fabrication steps. In step 1, the scanning line and the gate electrode extending from the scanning line are formed in the glass plate. In step 2, the gate insulation layer and the semiconductor layer comprised by amorphous silicon layer and namorphous silicon layer is laminated to provide the semiconductor layer for the TFT section. In step 3, the transparent conductive layer and the metallic layer are laminated, and the signal line, the drain electrode extending from the signal line, the pixel electrode and the source electrode extending from the pixel electrode are formed, and the namorphous silicon layer of the channel gap is removed by etching. In step 4, the protective insulation layer is formed, and the protective insulation layer and the metal layer above the pixel electrode are removed by etching.

Active matrix substrate plate and manufacturing method therefor

In a liquid-crystal display panel, columnar spacers are formed on a substrate on the transparent electrode side in minimally a part of the pixel parts of a plurality of pixel parts, in which there is little variation in the film thickness of a plurality of films formed over the substrate.

Liquid-crystal display panel with spacer in pixel electrode contact hole and method for manufacturing same

An active matrix substrate plate having superior properties is manufactured at high yield using four photolithographic fabrication steps. In step , the scanning line and the gate electrode extending from the scanning line are formed in the glass plate. In step , the gate insulation layer and the semiconductor layer comprised by amorphous silicon layer and n amorphous silicon layer is laminated to provide the semiconductor layer for the TFT section. In step , the transparent conductive layer and the metallic layer are laminated, and the signal line, the drain electrode extending from the signal line, the pixel electrode and the source electrode extending from the pixel electrode are formed, and the n amorphous silicon layer of the channel gap is removed by etching. In step , the protective insulation layer is formed, and the protective insulation layer and the metal layer above the pixel electrode are removed by etching.

Manufacturing method of active matrix substrate plate and manufacturing method therefor

This invention provides a liquid-crystal display where both pixel electrode and common electrode for controlling a liquid-crystal layer are disposed above a color filter covered with a shield electrode

Liquid-crystal display

This invention provides a color liquid-crystal panel comprising the first substrate having pixel electrodes on which are formed a thin-film transistor as a switching element for each pixel, which is covered by a passivation film, and a color filter layer and a black matrix on the passivation film, which are covered by an overcoat layer, and where the first substrate and the second substrate having a transparent common electrode facing the first substrate are put together via a sealer, forming an inner space which is filled with a liquid-crystal material, wherein a frame-shaped black matrix is formed on the first substrate, covering the periphery of the first substrate.

Color liquid-crystal panel having a frame-shaped black matrix and manufacturing process therefor

A liquid crystal display device comprises a transparent insulator substrate, switching elements which are formed on the transparent insulator substrate, a passivation layer for passivating the switching elements, color filters of prescribed colors which are formed on the passivation layer so that no color filter will be formed in areas around contact holes, black matrixes as shields for preventing light leakage which are formed on the passivation layer after the formation of the color filters so as to cover at least the switching elements and so that no black matrix will be formed in areas around the contact holes, an overcoat layer which is formed on the color filters and the black matrixes, pixel electrodes formed on the overcoat layer, lead electrodes of the switching elements for being connected to corresponding pixel electrodes, and contact holes which are formed through the overcoat layer and the passivation layer for establishing connection between the pixel electrodes and lead electrodes of the switching elements. The black matrixes are formed so that the edge of the black matrix touching the edge of the color filter will be superposed on the edge of the color filter.

Liquid crystal display with filter and light shield separated from contact hole

An LCD including a pair of transparent dielectric substrates, liquid crystal sandwiched between the transparent dielectric substrates; a TFT formed overlying the first transparent dielectric substrate, a first dielectric film made of non-photosensitive resin and a second dielectric film made of photosensitive resin which cover the inner side surface of a through-hole formed in the first and the second dielectric films. The yield and the reliability of the LCD are elevated because of the smooth shape of the second dielectric film.

Liquid crystal display device and method of fabrication TFT panel

A TFTs substrate in a liquid crystal display device, according to the present invention, is made up of a polarizing plate,, a glass substrate,, the first metal film,, a gate insulating film,, the second metal film,, a transparent conductive film,, and a passivation film,. A color filter substrate,is made up of a facing electrode,, a black matrix,, a glass substrate,, and a polarizing plate,. The transparent conductive film,is electrically connected to the facing electrode,via a transfer column,. The first metal film,is connected to the second metal film,. The partial area of the first and second metal films,and,corresponding to a region where the transfer column is fixed, is removed.

In a method for manufacturing an LCD device where a gate insulating layer is formed on an insulating substrate and a signal line pattern layer and a pixel electrode pattern layer are formed on a signal line forming area and a pixel electrode forming area, respectively, of the gate insulating layer, a part of the gate insulating layer between the signal line forming area and the pixel electrode forming area is etched.

Method for manufacturing LCD device capable of avoiding short circuit

A thin-film transistor (TFT) array for preventing the light reflected inside a liquid crystal panel from entering a channel layer, while suppressing an increase of stray capacitance. A light shading film and an antireflection film atop source and drain electrodes are made of semiconductor layers and are spaced from each other on a TFT. The reduction in reflected light prevents an increase in an off current and therefore improves the quality of a liquid crystal display.

Thin-film transistor array having light shading film and antireflection

In an active matrix liquid crystal display panel, each pixel electrode is connected to a first drain bus line through a thin film transistor which is formed adjacent to an intersection between the first drain bus line and an orthogonal gate bus line. A compensating capacitor lower electrode extends from the gate bus line at a position near to a second drain bus line which is adjacent to the pixel electrode in such a manner that the pixel electrode is positioned between the first and second drain bus lines. A compensating capacitor upper electrode is formed integrally with a source electrode of the thin film transistor, to extend along the pixel electrode so as to overlap above the compensating capacitor lower electrode through an insulator layer. Thus, a compensating capacitor is formed of the compensating capacitor lower and upper electrodes and is connected to a gate-source capacitance of the thin film transistor. A change in the gate-source capacitance caused by the positional deviation in the alignment between a gate electrode and the source electrode of the thin film transistor can be compensated by the inverse change in the capacitance of the associated compensating capacitor, without decreasing the aperture ratio of the pixel.

Growing community of inventors

Tokyo, Japan

Hirofumi Ihara