Matsushita Electric Industrial Co., Ltd.

Ikunori Kobayashi

Mamoru Takeda

Makoto Kato

Tomizo Matsuoka

Kenichi Kasazumi

Tetsu Ogawa

Yoneharu Takubo

Koji Matsunaga

Michiko Okafuji

Mitsuhiro Uno

Shinichiro Ishihara

Kazuyoshi Nakamura

Kenishi Kasazumi

A liquid crystal display panel includes a plurality of signal lines Yj (j=1-N: total signal line number N) and a plurality of scanning lines Xi (i=1-M) arranged in a matrix pattern of N.times.M, and thin film transistors for switching signal inputs between a display pixel electrode C (i, j) and signal wiring Yj, disposed to correspond to respective intersections of the signal lines and the scanning lines, and auxiliary capacitance Cadd formed in an electrically parallel relationship with the display pixel electrode C (i, j) composed of liquid crystal. The auxiliary capacitance Cadd is formed between the scanning line Xi-1 controlling the display pixel electrode C(i-1, j) at a previous stage of the display pixel electrode C (i, j) and display pixel electrode C (i, j), and disposed n such a positional relationship that the display pixel electrode C (i, j) completely covers the scanning line Xi-1 at the previous stage in a direction of its line width in terms of a cross sectional construction. By the above arrangement, variations of the display pixel signal due to a leaking electric field from the gate line may be reduced.

Active matrix liquid crystal having capacitance electrodes connected to

A liquid crystal display (LCD) panel includes a short-circuit ring formed of aluminum or an aluminum alloy during manufacture. The short-circuit ring is formed along a gate wiring line or a source wiring line. After the panel is inspected for defects, the short-circuit ring is removed. In the LCD manufacturing process, a glass substrate is cut outside the short-circuit ring made of aluminum, and thereafter the short-circuit ring is removed by grinding the short-circuit ring while spraying water having a low resistance on the substrate. The water may include carbon dioxide gas. Low resistance aluminum may be used as the gate wiring line and the short-circuit ring. This aluminum material, which is used as a current supply wiring line, can be subjected to an anodic oxidation process. Thus, it is not necessary to form a film of any metal other than aluminum. This can simplify or reduce the number of fabrication processes. Furthermore, because the aluminum is trimmed off by grinding, it is not clawed during cutting. In this manner, the aluminum short-circuit material is removed without causing short circuits between adjacent wiring lines and without slipping the tooth when scribing a scratch marking line by a scriber.

Liquid crystal display panel and method for manufacturing the panel

A thin film device includes a substrate, a conductive oxide film formed on the substrate, and a metal film formed on the substrate and in contact with at least a part of the conductive oxide film. The metal film includes aluminum and a metallic material. The metallic material has a standard electrode potential higher than the standard electrode potential of the aluminum so that the standard electrode potential of the metal film is higher than the reduction potential of the conductive oxide film.

Thin film device and a method for fabricating the same

Pixel electrodes in the periphery of a thin film transistor array (peripheral part of the display screen) of an active matrix type liquid crystal display device are directly electrically shortcircuited with signal lines, whereby an alternating current signal is always applied to the pixel electrodes without being passed through a thin film transistor as a switching element. Thereby the liquid crystal arranged on the peripheral part of the display screen is driven in a static state resulting in a high stability against the display characteristics.

Active matrix type liquid crystal display device with peripheral pixel

A thin-film transistor array is suited for the manufacture of an image display utilizing liquid crystal. In the thin-film transistor array, a first electrically conductive layer made principally of aluminum is selectively formed on one surface of a substrate. The first electrically conductive layer contains, as an impurity, a high-melting point metal which can be anodized. An oxide layer is formed by an anodization process on the first electrically conductive layer, and the first insulating layer is formed on the oxide layer so as to overlay the substrate. Furthermore, a first semiconductor layer made principally of silicon is selectively formed on the insulating layer, and a pair of second semiconductor layers made principally of silicon containing phosphorus are formed on the first semiconductor layer. A pair of second electrically conductive layers are formed on the paired second semiconductor layers, respectively.

Thin-film transistor array with anodic oxide for use in a liquid crystal

A method of making thin film transistors such that the first conductive layer of a thin film transistor is formed with an aluminum system metal having a low electric resistance, and another metal capable of anodic oxidation is deposited to prevent the aluminum system metal from producing hillocks. The metal capable of anodic oxidation and part of the aluminum system metal are changed into an insulator by an anodic oxidation treatment. In all, the gate insulator of the thin film transistor comprises three layers of aluminum oxide, an oxide of the metal capable of anodic oxidation, and silicon nitride. The method makes it possible to form the lower-layer wiring and gate electrode having a low electric resistance and a flawless gate insulator having excellent insulative quality.

Method of making thin film transistors

Light emitted from a coherent light source undergoes fine adjustment of its polarizing direction by a polarizing device and is directed to a liquid crystal device through a collimating optical system. The polarizing device is capable of fine-adjusting the polarizing direction in accordance with the wavelength of the incident light, thereby providing a high contrast ratio. When an image is recorded by holography using such a liquid crystal spacial light modulator, it is possible to obtain an image of high quality.

Growing community of inventors

Sakai, Japan

Ikunori Kobayashi