Abstract: A drive circuit for use in a matrix type liquid crystal display unit having a liquid crytal display panel with switching elements for addressing. The switching elements are provided at picture elements disposed in a matrix type display pattern. The drive circuit includes a row electrode driver coupled not only with terminals of row electrodes provided at one side of the liquid crystal display panel but also to the terminals of the row electrodes provided at opposite sides of the liquid crytal display panel and a changeover terminal for enabling the row electrode driver to drive the terminals of the row electrodes provided at the one side of the liquid crystal display panel or to drive the terminals of the row electrodes provided at the opposite sides of the liquid crystal display panel.

Abstract: A liquid crystal display device includes a plurality of scanning electrodes, a plurality of signal electrodes, and a plurality of picture element electrodes connected to intersections of scanning and signal electrodes via a plurality of switching transistors. A plurality of counter electrodes are arranged opposite to the picture element electrodes. The polarity of display signals applied to the signal electrodes is inverted for a period equal to an integer multiple of a pulse width of a scanning pulse applied to the scanning electrodes. Signals of alternating polarity are applied to the counter electrodes in synchronism with the polarity inversion of the display signals. In this way, non-uniform display contrast along the signal electrode direction of the display screen is avoided by eliminating the stray capacitance timing differences according to the position of picture element electrodes along the signal electrode direction of the display screen.

Abstract: A method of driving a matrix-type liquid crystal display panel comprising the step of dividing each scan pulse delivered to a plurality of row electrodes connected to the liquid crystal panel into plural scan periods; supplying video signal data via real-time operation during the initial divided period during alernate scan periods; generating new and proper signal source during the rest of the scan periods; and supplying data from the new signal source so that data can be written into liquid crystal layers. When dividing the width of the scan pulse into n pulses, the frame frequency can be raised n-times, thus making it possible to achieve a satisfactory liquid crystal picture display without the slightest flicker.

Abstract: In an active matrix liquid crystal display panel, row electrodes are divided into two portions at the approximate center of the display panel, the left row electrode portion belonging to an odd number row electrode group, and the right row electrode portion to an even number row electrode group. One horizontal scanning is conducted for each pair of left and right row electrodes to write data signals in the display picture elements. The width of a pulse applied to each row electrode corresponds to one horizontal scanning period. There is a phase difference of about 1/2 the horizontal scanning period between the pulses for an odd number row electrode and an even number row electrode, thus minimizing the difference in a write period among the display picture elements in the lateral direction of the display panel.

Abstract: A color liquid crystal display device which comprises picture element electrodes arranged in a matrix that is made up of the intersecting points of row electrodes and column electrodes, a 1st circuit board with switching elements that are connected to these picture element electrodes, a 2nd circuit board with opposing electrodes, a liquid crystal layer that is inserted in between the said 1st and 2nd circuit boards, a color filter with a specific pattern in between the said 1st and 2nd circuit boards, and a column electrode drive circuit that applies voltage corresponding to color arrangement of the color filter and the density of the display to the said column electrode. The column electrode drive circuit includes a sampling circuit which samples the momentary voltage corresponding to the display picture element out of the display signals that are input.

Abstract: A driving circuit for a matrix liquid crystal display device with switching transistors added to respective picture elements is divided into a plurality of blocks each of which selectively drives the switching transistors. The driving circuit is equipped with control means for actuating the blocks one by one in turn while electrically isolating the unactuated blocks from the circuit.

Abstract: A matrix liquid crystal display device provided with switching transistors, made of amorphous silicon thin-film for example, which are connected to each display picture element. The switching transistors are scanned with a scan pulse having width H which is set at a value greater than that is expressed by T/N, where H denotes the scan pulse width applied to row electrodes connected to each gate of the switching transistor, T denotes the total scan time and N the number of the scan lines. Concretely, the timewise width of the scan pulses is expanded or the number of applicable scan pulses is increased. The preferred embodiments relate to such a liquid crystal display driving system that can effectively minimize the decline of the voltage and the display characteristics caused by insufficient charge against the display picture element electrodes via the switching transistors.