Liquid crystal display device

摘要

An object of the present invention is to provide a small-sized active matrix type liquid crystal display device that may achieve large-sized display, high precision, high resolution and multi-gray scales. According to the present invention, gray scale display is performed by combining time ratio gray scale and voltage gray scale in a liquid crystal display device which performs display in OCB mode. In doing so, one frame is divided into subframes corresponding to the number of bit for the time ratio gray scale. Initialize voltage is applied onto the liquid crystal upon display of a subframe.

主权项

1. A liquid crystal display device comprising:
an active matrix substrate comprising an active matrix circuit in which a plurality of pixel TFTs are disposed in a matrix and a source driver, and a gate driver that drive the active matrix circuit over a substrate; an opposing substrate comprising an opposing electrode; a semiconductor layer over the substrate; a source electrode electrically connected to the semiconductor layer; a drain electrode electrically connected to the semiconductor layer; a first insulating layer over the source electrode and the drain electrode, the first insulating layer being provided with an opening; a conductive layer over the first insulating layer, a second insulating layer comprising nitrogen and silicon over the conductive layer; a pixel electrode comprising indium, tin and oxygen over the second insulating layer, wherein the pixel electrode is electrically connected to the drain electrode, wherein the pixel electrode overlaps a surface comprised in a portion of the conductive layer, wherein the conductive layer overlaps a surface comprised in a portion of a channel formation region in the semiconductor layer, wherein the conductive layer overlaps an interface comprised in a portion where the drain electrode and the semiconductor layer are in contact with, wherein the conductive layer overlaps a surface comprised in a portion of the source electrode, and wherein the pixel electrode comprises a first portion, a second portion, a third portion, and a fourth portion, wherein the fourth portion is provided above the third portion, the third portion is provided above the second portion, and the second portion is provided above the first portion, wherein the first portion comprises a surface provided along the first insulating layer, wherein an undersurface of the second portion is approximately parallel to the surface of the substrate, wherein the third portion comprises a surface provided along the second insulating film, wherein an undersurface of the fourth portion is approximately parallel to the surface of the substrate, and wherein the liquid crystal display device is configured to perform display by optically compensated bend mode.