Hitachi Displays, Ltd.

Panasonic Liquid Crystal Display Co., Ltd.

Hitachi, Ltd.

Hitachi Device Engineering Co., Ltd.

Other

Fumiaki Komori

Tetsuya Kawamura

Nobuyuki Ishige

Yoshihiro Imajo

Shiro Ueda

Kimitoshi Ohgiichi

Hiroshi Okawara

Tetsuro Izawa

Hisashi Ishino

Hiroshi Kageyama

Futoshi Furuta

Takashi Watanabe

Noboru Kataoka

A liquid crystal display includes pixels each having an switching element, drain drivers and gate drivers for operating the switching elements and the pixels, and drain lines and gate lines supplying signals from the drain drivers and the gate drivers to the switching elements being formed on one of a pair of substrates sandwiching a liquid crystal layer. Wiring lines are formed on the one of a pair of substrates for transferring display data signals and a clock signal to the gate drivers.

Driving method for display device

A display device includes a display panel, a control circuit and a random number generating circuit. The random number generating circuit includes a plurality of shift registers, an output circuit, and registers which holds initial values. By providing a plurality of initial values, the randomness of random numbers can be enhanced. Further, the random numbers different from each other can be outputted from the plurality of shift registers and hence, it is possible to increase the frequency and to output the increased frequency by an output circuit. Further, by adding a noise control signal which suppresses the number of inversion of a digital signal, electromagnetic wave noises generated from a liquid crystal display device can be reduced. Further, by adopting an intermittent drive clock which intermittently repeats stopping thereof as a basic clock of the plurality of shift registers, electromagnetic wave noises generated from the display device can be reduced. The basic clock may be a clock which is in synchronism with a transmission clock of the display data or a clock which is in asynchronism with a transmission clock of the display data.

Display device

To realize a random number generating circuit that is optimum for a liquid crystal display device that is used in a terminal device that includes a display/input component. A liquid crystal display device includes a liquid crystal display panel, a control circuit and a random number generating circuit, the random number generating circuit comprises plural shift registers, an output circuit and a register that stores an initial value, and the random number generating circuit is equipped with plural initial values, whereby the randomness of the random numbers is improved. Further, it becomes possible to increase and output frequencies by the output circuit because it is possible to output respectively different random numbers from the plural shift registers.

The present invention provides a technique which can decrease the number of folding times of a flexible printed circuit board in a display device having the structure which can fold the flexible printed circuit board in a compact form by folding the flexible printed circuit board plural times. The display device includes a display panel having substrates, and a flexible printed circuit board having one end thereof fixed to a peripheral portion of a first side of the substrate, wherein the flexible printed circuit board forms an I/F portion on which a plurality of input terminals is formed in the inside thereof in a state that the flexible printed circuit board is developed.

To long sides of a front-side liquid crystal display panel and a rear-side liquid crystal display panel on the same side, elongated portions of flexible printed circuit boards having a substantially U-shape in a plan view are respectively connected by thermo-compression bonding. Due to such a constitution, when the front-side liquid crystal display panel and the rear-side liquid crystal display panel overlapping each other use the flexible printed circuit boards having the same specification, the flexible printed circuit boards can be easily pulled around and connected to a drive printed circuit board and, at the same time, can enhance a material cutting efficiency of flexible printed circuit boards, and can provide a liquid crystal display device at a low cost.

Liquid crystal display device

A display device includes a display panel; plural first semiconductor chips mounted on the periphery of a first side of a substrate forming the display panel in a first direction; and first power source wiring layer provided on the periphery of the first side substrate. A location of a bump electrode of the first semiconductor chip provided on one end in the first direction, the bump electrode being connected to the first power source wiring layer, is different from a location of a bump electrode of the first semiconductor chip provided on the other end in the first direction, the bump electrode thereof being connected to the first power source wiring layer.

In a liquid crystal display comprising a plurality of pixels each of which has an switching element, a plurality of drain drivers and gate drivers for operating the switching elements and the pixels, and a plurality of drain lines and gate lines supplying signals from the drain drivers and the gate drivers to the switching elements being formed on one of a pair of substrates sandwiching a liquid crystal layer, the present invention provides wiring lines formed on the one of a pair of substrates for transferring display data signals and a clock signal between each pair of the plurality of drain drivers adjacent to one another, and provides at least one gate circuit for at least one of the plurality of drain drivers which is controlled by the clock signal and switches the display data signals and the clock signal either (1) to be acquired by the at least one of the plurality of drain drivers or (2) to be transferred to another of the plurality of drain drivers arranged adjacent to the at least one of the plurality of drain drivers. This liquid crystal display device has an advantage, for instance, or of suppressing electromagnetic interference (EMI) to another equipment surrounding the liquid crystal display device, of preventing the display data signals or the clock signal from being distorted in the wiring lines.

Growing community of inventors

Ohhara, Japan

Fumiaki Komori