Other

Hitachi, Ltd.

Hitachi Ulsi Systems Co., Ltd.

Hitachi Device Engineering Co., Ltd.

Panasonic Liquid Crystal Display Co., Ltd.

Hitachi Displays, Ltd.

Japan Display Inc.

Hiroshi Katayanagi

Mitsuru Goto

Yukihide Ode

Koichi Kotera

Yoshiyuki Saitou

Kentaro Agata

Kazunari Kurokawa

Akira Ogura

Takahiro Fujioka

Tsuyoshi Uchida

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.

To provide a display device capable of reliably forming a resistive element formed on a substrate including pixels. A display device including at least a thin-film transistor and a resistive element on a substrate has a gate electrode, an insulating film, a semiconductor layer and a conductive layer which are sequentially stacked on the substrate, in which the resistive element is formed by using the semiconductor layer formed between end portions of wiring made of the conductive layer as a resistive body, and at least one conductive layer apart from the end portions is formed on the semiconductor layer between the end portions of wiring.

Display device

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.

A liquid crystal display device has a semiconductor integrated circuit capable of outputting a voltage equal to or higher than the source-drain withstand voltage of a component transistor. A switching circuit has first conducting-type first and second transistors connected in series between a first input terminal and a common output terminal and second conducting-type third and fourth transistors connected between a second input terminal and the common output terminal and a switching control circuit for controlling the switching circuit. The switching control circuit applies first and second bias voltages for turning on the second and fourth transistors to the gate electrodes of the second and fourth transistors, and applies a control voltage for selectively turning on/off the first or third transistor to the gate electrodes of the first and third transistors.

Liquid crystal display device

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 device including a liquid crystal panel having a plurality of pixels, a driving circuit applying a video signal voltage to each of the pixels in accordance with display data. The driving circuit has a first circuit, a second circuit, and a switching circuit which connects an output terminal of the first circuit with an input terminal of the second circuit. The first circuit outputs a first voltage and a second voltage in accordance with first display data, and outputs the second voltage and a third voltage in accordance with second display data. The second voltage is lower than the first voltage, and the third voltage is lower than the second voltage.

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.

A liquid crystal display device is capable of generating gradation voltages for multilevel gradation, such as 256-level gradation, without increasing the chip size of video signal line driving means. The video signal line driving means for applying video signal voltages for multilevel gradation in accordance with m-bit display data is provided with a first gradation voltage generator for generating (2,&plus;1) first gradation voltages, a selector for selecting first gradation voltages adjacent to each other out of (2,&plus;1) first gradation voltages generated by the first gradation voltage generator in accordance with the bit values of high-order n bits of the m-bit display data, while keeping the magnitude relationship between the (2,&plus;1) first gradation voltages unchanged, and a second gradation voltage generator for generating and outputting one of 2,gradation voltages dividing first gradation voltages adjacent to each other into 2,voltages from the first gradation voltages adjacent to each other selected by the selector in accordance with the bit values of low-order (m-n) bits of the display data.

Growing community of inventors

Chiba, Japan

Hiroshi Katayanagi