US 6,285,429 B1Granted

Liquid crystal display device and method for its production

AssigneeNEC Corporation

InventorsShinichi Nishida, Makoto Watanabe, Kimikazu Matsumoto

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Abstract

In a liquid crystal display device of a lateral electric field driving system, coloring problem in display is prevented in all the white, intermediate tone and the black display mode. In this liquid crystal display device: one of an incident side polarizing plate and an exit side polarizing plate has its polarizing axis substantially coincide with the direction of the orientation of a liquid crystal layer; an optical compensating layer is interposed between at least one of transparent substrates and the incident side polarizing plate or the exit side polarizing plate both disposed outside the at least one of the transparent substrates, the optical compensating layer having a refractive index anisotropy with the other polarity other than that in the refractive index of the liquid crystal layer; and, the optical compensating layer has the direction of its anisotropy axis substantially coincide with the direction of the orientation of the liquid crystal layer, provided that the orientation direction includes a predetermined pre-tilt angle.

Claims6

Dependent claims

In a liquid crystal display device comprising:

a first and a second transparent substrate oppositely disposed and spaced apart from each other through a cell gap;
a liquid crystal layer which has a refractive index anisotropy with one polarity and homogeneously oriented in parallel to a surface of said transparent substrate;
a first and a second polarizing plate having their polarizing axes crossed with each other at right angles, said first and said second polarizing plate being disposed outside said first and said second transparent substrate;
wherein a pixel electrode and its counter electrode opposite thereto are formed for every pixel on said first transparent substrate, and a voltage is applied between said pixel electrode and said counter electrode to establish an electric field in parallel to said surface of said transparent substrate, whereby said liquid crystal layer is controlled in its orientation, the improvement wherein:
one of said first and said second polarizing plate has its polarizing axis substantially coincide with the orientation of said liquid crystal layer;
an optical compensating layer is interposed between at least one of said first and said second transparent substrate and one of said first and said second polarizing plate disposed outside said at least one, said optical compensating layer having an uniaxial refractive index anisotropy different in polarity from said polarity of said refractive index anisotropy of said liquid crystal layer;
and said optical compensating layer has the direction of its anisotropy axis substantially coincide with the orientation direction of said liquid crystal layer, said orientation direction including a predetermined pre-tilt angle.

4 more elements

A method of producing a liquid crystal display device, comprising the steps of:

forming a pixel electrode and its counter electrode on a surface of a first transparent substrate for every pixel;
oppositely disposing a second transparent substrate from said first transparent substrate so as to form a cell gap therebetween, in which cell gap a liquid crystal layer having a refractive index anisotropy with one polarity is formed and homogeneously oriented in a direction substantially parallel to a surface of said transparent substrate;
forming an optical compensating layer outside one of said first and said second transparent substrate in a manner such that said optical compensating layer has the direction of its anisotropy axis substantially coincide with the orientation direction of said liquid crystal layer, said orientation direction including a predetermined pre-tilt angle, said optical compensating layer having an uniaxial refractive index anisotropy different in polarity from said polarity of said refractive index anisotropy of said liquid crystal layer;
and
forming a first and a second polarizing plate having their polarizing axes crossed with each other at right angles, said first and said second polarizing plate being disposed outside said compensating layer and outside said first and said second transparent substrate, one of said first and said second polarizing plate having its polarizing axis substantially coincide with the direction of the orientation of said liquid crystal layer.

2 more elements

Dependencies are inferred from the claim text.