Hitachi Displays, Ltd.

Panasonic Liquid Crystal Display Co., Ltd.

Hitachi Displays Co., Ltd.

Kenta Kamoshida

Tetsuya Kawamura

Nagatoshi Kurahashi

Hiroaki Iwato

Masashi Sato

Masanori Ookawa

Toshiki Kaneko

Yasuko Gotoh

Hideshi Nomura

A liquid crystal display device includes pixels, each of which includes a first transistor and a second transistor. The size of the first transistor is larger than the size of the second transistor. In addition, channel widths and gate widths for the first transistor are larger than those of the second transistor. Also, the first transistor is located to be closer to a drain signal line provided for the pixel than the second transistor. In normal operation, the first transistor is coupled to the drain signal line and the second transistor is floating. However, if an abnormality occurs in the first transistor, it is cut off from the drain signal line and the second transistor is connected to the drain signal line by a repair line.

LCD device with pixels including first and second transistors of different sizes and connections

A normal transistor CTFT connected to a data signal line DL and a pixel electrode PX and a spare transistor FTFT in a floating state are formed on a gate line GL. When an operational abnormality occurs in the normal transistor CTFT, the normal transistor CTFT is cut off from the data signal line DL and is cut off from the pixel electrode PX connected via a through hole TH by cutting lines CL. Thereafter, the spare transistor FTFT is connected to the data signal line DL and the pixel electrode PX by repair lines RL.

Liquid crystal display device having spare transistor with normal transistor separable from data signal line and pixel electrode

A display device is provided with a first contact hole formed in a display region and a second contact hole formed in a terminal region, and a first insulating layer and a second insulating layer formed in that order. The taper angle of the first insulating layer at the first contact hole is larger than the taper angle of the first insulating layer at the second contact hole, and the taper angle of the second insulating layer at the first contact hole is larger than the taper angle of the second insulating layer around the second contact hole.

Display device having contact holes' taper angle larger in display region than in terminal region

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Tokorozawa, Japan

Kenta Kamoshida