Hitachi, Ltd.

Kuniyuki Matsunaga

Masahiko Suzuki

Junichi Ohwada

Kikuo Ono

Takanori Nakayama

Shiro Ueda

Tatsuo Kamei

Masataka Natori

Hikaru Itoh

Hikaru Ito

Kimitoshi Oogiichi

Makoto Tsumura

Hideaki Yamamoto

Hitoshi Komeno

Kimitoshi Ohgiichi

Masumi Sasuga

Kazuya Nakamura

Hiroshi Ookawara

Hikaru Itou

A liquid crystal display device, or more particularly, an active matrix type liquid crystal display device having a pixel electrode formed in a pixel field defined on one of two transparent substrates opposed to each other with a liquid crystal layer between them. The pixel electrode is overlapped a signal line, which is formed in a portion of the one transparent substrate coincident with a black matrix, with a dielectric between them. The width of the overlap is set to a value satisfying a condition that an electric field induced between the signal line and pixel electrode will not invade into the pixel field defined with the black matrix. Owing to the structure, inhomogeneous luminance caused by a source electrode of a thin film transistor can be avoided. Moreover, inhomogeneous luminance caused by a capacitive element can be avoided.

Liquid crystal display device

A liquid crystal display device can readily achieve uniformization of the threshold voltages of individual thin film transistors in spite of its simple construction. The liquid crystal display device includes gate signal lines juxtaposed in one direction, drain signal lines juxtaposed to intersect with the gate signal lines, thin film transistors which are respectively formed in areas each surrounded by the gate signal lines and the drain signal lines and are driven by supply of scanning signals from the gate signal lines, pixel electrodes to which video signals from the drain signal lines are to be supplied via the respective thin film transistors, a first terminal for applying voltages to the respective gate signal lines via diodes, and a second terminal for applying voltages to the respective drain signal lines via diodes.

Liquid crystal device having resistor elements

The i-type semiconductor layer (AS) and the gate insulating film (GI) are patterned along and in the same shape as the video signal lines (DL) between the video signal lines (DL) and the first transparent glass substrate (SUB1 ). The backlight is disposed on the second transparent glass substrate (SUB2) side. Therefore, signal line reflection of external light can be prevented, improving the display quality.

Structure of liquid crystal display device for antireflection

A liquid crystal display device is provided which reduces the resistance of input wires disposed between a flexible board and driving ICs mounted in a flip-chip style, and enhances resistance against electrocorrosion of input terminals thereof. The liquid crystal display device includes two transparent insulating substrates (SUB1, SUB2) confronting each other through a liquid crystal layer, plural liquid crystal driving circuits (ICs) mounted in a flip-chip style on a surface of one of the substrates located at the side of the liquid crystal layer, a flexible board (FPC) for inputting a signal to each of the liquid crystal driving circuits, and plural input wires (Td) provided on the surface of the one substrate at the side of the liquid crystal layer to connect output terminals of the flexible board to input terminals of the liquid crystal driving circuits. Each input wire includes a first metal layer (g1) in the vicinity of the surface of the substrate, a transparent conductive layer (d1) laminated on the first metal layer, connected to the input terminals of the flexible board, with open portions in the neighborhood of the input terminals of the liquid crystal driving circuits and in the neighborhood of the output terminals of the flexible board, a second metal layer (d2) laminated on the transparent conductive film and connected to the first metal layer at the open portions, and a protection film (PSV1) covering at least the second metal layer.

LCD device having driving circuits with multilayer external terminals

The i-type semiconductor layer (AS) and the gate insulating film (GI) are patterned along and in the same shape as the video signal lines (DL) between the video signal lines (DL) and the first transparent glass substrate (SUB1). The backlight is disposed on the second transparent glass substrate (SUB2) side. Therefore, signal line reflection of external light can be prevented, improving the display quality.

The gate terminal GTM is formed of the aluminum film g and the transparent conductive film dl, which is deposited on the aluminum film g. The gate terminal GTM is formed at its side with a connection portion where the transparent conductive film dl is not provided but where a connection film CNF made of second and third conductive films d2, d3 is provided to connect the aluminum film g and the transparent conductive film dl. At the side of the gate terminal GTM where the connection film CNF is provided, a terminal side portion protective film TSP1 at the same level as the passivation film PSV1 is formed. At the other side of the gate terminal GTM, a terminal side portion protective film TSP2 is provided, which consists of a film at the same level as the insulation film GI and a film at the same level as the passivation film PSV1.

Liquid crystal display device with a structure of improved terminal

Growing community of inventors

Mobara, Japan

Kuniyuki Matsunaga