Other

Hitachi Ulsi Systems Co., Ltd.

Hitachi, Ltd.

Hitachi Device Engineering Co., Ltd.

Panasonic Liquid Crystal Display Co., Ltd.

Hitachi Displays, Ltd.

Japan Display Inc.

Koichi Kotera

Mitsuru Goto

Yukihide Ode

Hiroshi Katayanagi

Yoshiyuki Saitou

Shinji Yasukawa

Yuji Yamashita

Kentaro Agata

Hironobu Isami

Kenichi Akiyama

Yozo Nakayasu

A semiconductor integrated circuit including a first register which latches display data, a second register which latches the display data of the first register in accordance with a first clock, a gray scale voltage generator which outputs a plurality of gray scale voltages, a decoder which selects a gray scale voltage in accordance with the display data of the second register from the plurality of gray scale voltages, and an amplifier including a first transistor and a second transistor. A first terminal of the first transistor and a first terminal of the second transistor are connected to a first voltage line, and the gray scale voltage outputted from the decoder is supplied to one of input terminals of the first transistor and the second transistor in accordance with a control signal. A phase of the control signal is reversed at intervals of two horizontal scanning lines.

Liquid crystal display device with influences of offset voltages reduced

A semiconductor integrated circuit includes a first register which latches display data, a second register which latches the display data of the first register in accordance with a first clock, a gray scale voltage generator which outputs a plurality of gray scale voltages, a decoder which selects a gray scale voltage in accordance with the display data of the second register from the plurality of gray scale voltages, and an amplifier including a first transistor, and a second transistor. A first terminal of the first transistor and a first terminal of the second transistor are connected to a first voltage line, and the gray scale voltage outputted from the decoder is supplied to one of input terminals of the first transistor and the second transistor in accordance with a control signal. A phase of the control signal is reversed at intervals of two frame periods.

A semiconductor integrated circuit includes a first register, a second register, a gray scale voltage generator which outputs a plurality of gray scale voltages, a decoder which selects a gray scale voltage, and an amplifier including a first transistor, a second transistor, a third transistor, and a fourth transistor. A first terminal of the first transistor and a first terminal of the second transistors are connected to a first voltage line, a first terminal of the third transistor and a first terminal of the fourth transistor are connected to a second voltage line, a second terminal of the first transistor is connected to a second terminal of the third transistor, and a second terminal of the second transistor is connected to a second terminal of the fourth transistor.

A liquid crystal display device includes drain signal lines, gate signal lines, thin film transistors, and a drain driver. The drain driver includes an amplifier circuit having a switching circuit which switches between a first state and a second state, the first state being a state where a first input terminal of the amplifier circuit is coupled to an inverting input terminal and a second input terminal is coupled to a noninverting input terminal, and the second state being a state where the first input terminal is coupled to the noninverting input terminal and the second input terminal is coupled to the inverting input terminal. The amplifier circuit supplies signal voltages to the thin film transistors via the drain signal lines which are gray scale voltages one of plus and minus offset voltages in a first frame and in a second frame.

A liquid crystal display device having a liquid crystal display element having a plurality of pixels. The video signal line driver circuit includes a plurality of amplifiers each of which has a pair of a first input terminal and a second input terminal, and a plurality of pairs of an inverting input terminal and a noninverting input terminal. Each of the plurality of amplifiers has a switching circuit which switches between a first state and a second state, based on a switching control signal supplied with a switching repetition period equal to double a display line repetition period.

Each video signal driver circuit in a liquid crystal display device includes a first amplifier circuit with a first output terminal and first and second input terminals; a second amplifier circuit with a second output terminal and third and fourth input terminals; a first connecting circuit switchable between a first connection wherein an output voltage from the first output terminal is input to the first input terminal as a reference voltage, and a second connection wherein the output voltage from the first output terminal is input to the second input terminal as a reference voltage; and a second connecting circuit switchable between a third connection wherein an output voltage from the second output terminal is input to the third input terminal as a reference voltage, and a fourth connection wherein the output voltage from the second output terminal is input to the fourth input terminal as a reference voltage.

A liquid crystal display element having pixels, video signal lines applying a video signal voltage to the pixels and a video signal line driver supplying the video signal voltages to the video signal lines. The video signal line driver circuit includes a gray-scale voltage generating circuit provided with a resistor circuit dividing voltages between plural gray-scale reference voltages to generate plural gray-scale voltages, and selector circuits selecting one gray-scale voltage in accordance with the display data. The resistor circuit includes a resistive element provided with plural Intermediate taps for dividing voltages to generate the gray-scale voltages, gray-scale voltage lines corresponding to the gray-scale voltages, an interlayer insulating film insulating the gray-scale lines from the resistive element, and connections connecting the gray-scale voltage lines to corresponding ones of the intermediate taps through a hole in the interlayer insulating film.

Liquid crystal display device having an improved video line driver circuit

A liquid crystal display device includes a liquid crystal panel having plural pixels and a video signal line driver circuit for supplying a video signal voltage to each of the pixels via a corresponding one of plural video lines in accordance with a P-bit display data. The video signal line driver circuit includes a power supply circuit for supplying Q different gray-scale voltages, plural selector circuits corresponding to the video lines, each of the selector circuits for outputting one of first and second pairs of voltages in accordance with the display data, the first pair being two voltages equal to a same one selected from among the Q different gray-scale voltages, the second pair being two different voltages selected from among the Q different gray-scale voltages, and plural amplifiers corresponding to the video lines, each of the amplifiers for outputting the video signal voltage to a corresponding one of the video lines based upon one of the first and second pairs of voltages or a voltage intermediate between the second pair of voltages and produced from the second pair of voltages in the amplifiers.

Liquid crystal display device having an improved gray-scale voltage generating circuit

A liquid crystal display device includes plural pixels supplied with video signal voltages via video signal lines, and a video signal line driver circuit for supplying the video signals voltage to the video signal lines. The video signal line driver circuit includes plural differential amplifiers each having a pair of a first input terminal and a second input terminal and amplifying inputted video signals and supplying the amplified video signal to the video signal lines, a plurality of pairs of an inverting input terminal and a noninverting input terminal each pair corresponding to each of the differential amplifiers. The differential amplifiers each have a switching circuit for switching between a first state and a second state with a specified period, the first state being a state where the first input terminal is coupled to the inverting input terminal and the second input terminal is coupled to the noninverting input terminal, and the second state being a state where the first input terminal is coupled to the noninverting input terminal and the second input terminal is coupled to the inverting input terminal.

Growing community of inventors

Kokubunji, Japan

Koichi Kotera