Casio Computer Co., Ltd.

Oki Electric Industry Co., Ltd.

Hiroyuki Okimoto

Makoto Sasaki

Mamoru Yoshida

Tsutomu Nomoto

Syunichi Sato

Hisatoshi Mori

Atsushi Mawatari

Shunichi Sato

Katsumi Kitagawa

Shyunichi Sato

Takeshi Sawatsubashi

A thin film transistor panel comprises a substrate, pixel electrodes arranged on the substrate in a matrix form, TFTs each having a source electrode connected to the associated pixel electrode, gate lines and data lines, both connected to the associated TFTs. An auxiliary electrode connected to the associated gate line and a capacitance compensation electrode are provided in such a manner as to cancel a change in gate-source capacitance caused by an alignment error in the manufacturing process. The capacitance compensation electrode is shifted by the same amount as the shift of the source electrode. When the facing area between the gate electrode and source electrode increases (or decreases) due to an alignment error in the manufacturing process, the facing area between the auxiliary electrode and capacitance compensation electrode decreases (or increases). Therefore, the total gate-source capacitance or the sum of the capacitance between the facing portions of the gate electrode and source electrode and the capacitance between the facing portions of the auxiliary electrode and capacitance compensation electrode is constant regardless of a variation in the position of the source electrode.

Thin film transistor panel having an extended source electrode

A liquid crystal display device comprises a first substrate on which a plurality of thin-film transistors, a plurality of pixel electrodes respectively connected to the thin-film transistors, a plurality of gate lines for connecting gate electrodes of the thin-film transistors, and a plurality of drain lines for connecting drain electrodes of the thin-film transistors are arranged in a matrix pattern, a second substrate on which a plurality of divisional common electrodes which face the plurality of pixel electrodes are formed, and a liquid crystal material encapsulated by the first and second substrates and a sealing member, and interposed between the plurality of pixel electrodes and the plurality of divisional common electrodes. The matrix pattern on the first substrate is formed by a photolithograpy process comprising a step of divisionally exposing photoresist in a plurality of divisional regions by using a stepper. The plurality of divisional common electrodes have sizes corresponding to the divisional regions divisionally exposed by the stepper and are separated from one another.

Active matrix liquid crystal display device with divisional common

A thin film transistor array comprises an insulative substrate, a plurality of pixel electrodes arranged in a matrix on the insulative substrate, a plurality of thin film transistors connected respectively to the pixel electrodes, a plurality of address lines formed on the insulative substrate, each address line being connected to a plurality of control electrodes of the thin film transistors, and a plurality of data lines arranged on the insulative substrate in such a manner as to intersect the address lines, each data line being connected to a plurality of data input electrodes of the thin film transistors. A short-wiring is formed on the outside of a display region on the insulative substrate on which the pixel electrodes are arranged, and the short-wiring is connected to at least two of the address lines and the data lines by a two-terminal element having non-linear resistance characteristics defining voltage/current characteristics on the basis of a space charge limited current.

Thin-film transistor array and liquid crystal display device using the

A display device has first and second substrates, a liquid-crystal layer, pixel electrodes arranged on the first substrate, a plurality of semiconductor active elements connected to the pixel electrodes, signal lines for supplying drive signals to the active elements, and a plurality of opposing electrodes arranged on the second substrate. Each pixel electrode, that portion of each opposing electrode which overlaps the pixel electrode, and that portion of the liquid-crystal layer which is sandwiched between the pixel electrode and said that portion of the opposing electrode form a pixel. A voltage having a positive or negative value according to the image data is applied between the input terminal of the semiconductor active element and said at least one of the opposing electrode, for a selecting period. Also, a voltage having such a waveform that at least two components thereof which are positive and negative with respect to a non-selecting potential which the scan signal has during the non-selecting period, said at least two component having substantially the same area, is applied between the input terminal of the semiconductor active element connected to said at least one of the pixel electrodes and said at least one of the opposing electrode, for the non-selecting period.

Method of driving liquid-crystal display elements

A liquid crystal display device comprises first and second substrates disposed to face each other, first and second electrodes formed on the both substrates to opposed to each other and forming a display region, signal leads formed on the second substrate and connected to the second electrodes, a seal surrounding the display region between the substrates and connecting together the substrates, a driving circuit provided between outer edges of the display region and those of the seal and connected to the leads, for generating a driving signal and supplying the signal to the wires in response to externally input display data, and a liquid crystal material sealed in a space surrounded by the substrates and seal.

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Hino, Japan

Hiroyuki Okimoto