Liquid crystal display comprising erase electrodes

摘要

Active matrix liquid crystal displays, mainly applicable to screens with small dimensions, fabricated for example starting from silicon substrates, are especially applicable to display operation in color sequential mode. The pixel comprises a pixel electrode controlled by a control transistor and counter-electrodes situated on the same side of the liquid crystal as the pixel electrode and parallel to the pixel electrode; the liquid crystal is composed of molecules having a natural rest orientation in the absence of a voltage between the pixel electrode and the counter-electrodes and a different orientation in the presence of an electric field created between the pixel electrode and the counter-electrodes. Erase electrodes are situated on either side of the pixel in a transverse direction with respect to the counter-electrodes and are designed to produce, during an erase phase, an erase electric field tending to return the molecules of the liquid crystal to their rest orientation.

主权项

1. A liquid crystal display comprising a matrix of horizontal rows and vertical columns of pixels and, for each pixel, a liquid crystal cell, a pixel electrode controlled by a control transistor and at least two counter-electrodes situated on the same side of the liquid crystal as the pixel electrode, the liquid crystal being composed of molecules having a natural rest orientation in the plane of the display in the absence of a voltage between the pixel electrode and the counter-electrodes and another orientation in the plane of the display in the presence of a voltage between the pixel electrode and the counter-electrodes, this display further comprising an array of erase electrodes, and means for applying between two neighboring erase electrodes, during an erase phase, an erase electric field in a direction tending to return the molecules of the liquid crystal toward their rest orientation, wherein the counter-electrodes are parallel to the pixel electrode and common to all the pixels of a horizontal row, and each erase electrode runs along a vertical column of pixels and is common to the pixels of this vertical column.