Sharp Kabushiki Kaisha Corporation

Koki Taniguchi

Norio Yasunishi

Kiyohisa Matsui

Yutaka Ishii

Hajime Washio

Kunihiko Yamamoto

Toshihiro Nakamura

Hiroyuki Furukawa

Toshihiro Ohba

Tamaki Mashiba

Satoshi Ueno

Hiromasa Asada

Keiji Nakayama

Shigeri Yamaguchi

A liquid crystal display device having a plurality of row electrodes to which a scanning voltage is applied; a plurality of column electrodes provided so as to cross the plurality of row electrodes, to which a display data voltage is applied; and a liquid crystal layer interposed between the plurality of row electrodes and the plurality of column electrodes, which provides a display function at intersections between the plurality of row electrodes and the plurality of column electrodes in response to a RMS value of a voltage applied between the plurality of row electrodes and the plurality of column electrodes, includes: a section for outputting a display data signal representing the display data voltage having three or more voltage levels; a compensation circuit for outputting a compensation data signal based on a RMS value difference between the display data voltage and a respective resultant display data voltage applied to the plurality of column electrodes; and a driving circuit for applying a compensation voltage to at least one of the plurality of column electrodes based on the compensation data signal.

Liquid crystal display device

A driving method for a liquid crystal display is provided with the steps of (a) applying a row select voltage to each of the row electrodes simultaneously, the row select voltage corresponding to an element of an orthogonal matrix and being either +1 or -1 ; (b) conducting an exclusive-or operation with respect to each element of a row select vector and a display vector, the row select vector indicating the row select voltages by vector notation and the display vector indicating a display data by the vector notation, and conducting a summation of each exclusive-or operation; (c) applying to the column electrode a voltage of a level which varies depending on the summation so as to simultaneously drive the plurality of rows; and (d) in a case where all the display data correspond to ON display or OFF display in the step (c), assigning the row select voltage, applied to either the selected row electrode having the lowest select voltage among driving voltages within one frame period for the ON display or the selected row electrode having the highest select voltage among the driving voltages within one frame period for the OFF display, to a virtual row electrode outside a display area, and applying a virtual display data to the virtual row electrode.

Driving method for a liquid crystal display

A driving device for a display apparatus having excellent contrast and a high display quality without crosstalk and display irregularities, and a driving method for the same are provided. In the driving device, scanning signals and data signals having a plurality of periodical inactive portions in one frame are applied to respective display dots. In the inactive term, a fixed voltage is applied to each of the display dots. The signal applied to the display dot is divided into small terms by the inactive portions, resulting in more high frequency components in a voltage signal applied to the display dot. As a result, the frequency components of a driving signal applied to the display dot are averaged. Further, a complete orthogonal function having 2.sup.r base function series is used, and a desired display data is completely reproduced on the display apparatus by an arithmetic process assuming auxiliary data in accordance with the number of the scanning electrodes.

Driving device for a display panel and a driving method of the same

A liquid crystal driving system using a dynamic driving method, which includes circuits for driving liquid crystals by applying AC-converted signals containing a specific frequency which is higher than the frame-frequency and different from the duty factor of the data signals.

Liquid crystal driving system

Disclosed is a liquid crystal display device containing an electrode substrate, a circuit substrate, and a flat-type back light, which incorporates a guide apparatus consisting of several guide members for guiding the back light onto the back surface of the electrode substrate, in which the guide members provide grooves with tapered ends and a narrowed shape at one end, but a wide juncture portion for connecting the guide members together. The edges of the back light unit fit in the grooves. Stopper members are provided facilitate connection to the electrode substrate; and fixing members are provided to secure the guide members to the circuit substrate.

Liquid crystal display with stopper pins in guide means

A PC board consisting of a conductive layer laid through an insulating layer on a metal plate surface is easily bendable to make any desirable shape. This permits any desired distance to be provided between the display element and the PC board. In addition, it is possible to form display element-fixing angles integrally with the PC board. As a result, the number of components required is decreased and production efficiency improved. Moreover, the metal plate of the PC board protects the display device from unnecessary radiation, external noises and/or static electricity.

Display device and printed circuit board

An anisotropic electric conductive rubber is formed in a reversed L-shape and has integral horizontal and vertical portions. An insulating rubber is applied to the top of the horizontal portion or to the top of the horizontal portion and the outer side of the vertical portion so that a mounting angle is electrically insulated from the electric conductive rubber and that the anisotropic electric conductive rubber is protected from moisture and dust. Moreover, the insulating rubber is softer than the anisotropic electric conductive rubber. As a result, the connector as a whole is relatively soft so that it is hardly damaged and that precise dimension is easily obtained.

Anisotropic electric conductive rubber connector

A method for connecting two circuit boards characterized in that by using rubber connectors, each having an open part for receiving circuit boards, an edge of a first circuit board requiring connection inserted into the open part of the rubber connector, followed by pressing a second rubber connector against the circuit board to complete connection of the two circuit boards.

Growing community of inventors

Osaka, Japan

Koki Taniguchi