US 7,072,015 B2 · Liquid crystal display device and electronic device

Abstract

The present invention provides a high-contrast reflective display and transmissive display with a wide viewing angle in a transflective liquid crystal display device having reflective and transmissive structures. In such a display, each of dots can contain a reflective display region for reflective display and a transmissive display region for transmissive display. A liquid crystal layer can be composed of a nematic liquid crystal aligned substantially perpendicularly to substrates and having a negative dielectric anisotropy. A first retardation film having an optically negative uniaxiality, a second retardation film having an optically positive uniaxiality, and a first polarizer are arranged in that order outside an upper substrate, and a third retardation film having an optically negative uniaxiality, a fourth retardation film having an optically positive uniaxiality, a second polarizer, and illumination means are arranged in that order outside a lower substrate.

Claims27

Dependent claims

A liquid crystal display device, comprising:

a liquid crystal layer that is held between a first substrate and a second substrate, in which each of dots contains a reflective display region for reflective display and a transmissive display region for transmissive display, the liquid crystal layer being composed of a nematic liquid crystal having a negative dielectric anisotropy;
a first retardation film having an optically negative uniaxiality, a second retardation film having an optically positive uniaxiality, and a first polarizer that are arranged in that order outside the first substrate;
and
a third retardation film having an optically negative uniaxiality, a fourth retardation film having an optically positive uniaxiality, a second polarizer, and an illumination device that are arranged in that order outside the second substrate.

1 more element

A liquid crystal display device, comprising:

a liquid crystal layer that is held between a first substrate and a second substrate, in which each of dots contains a reflective display region for reflective display and a transmissive display region for transmissivedisplay, the liquid crystal layer being composed of a nematic liquid crystal aligned having a negative dielectric anisotropy;
a first retardation film having an optically negative uniaxiality, a second retardation film having an optically positive uniaxiality, and a first polarizer that are arranged in that order outside the first substrate;
and
a fourth retardation film having an optically positive uniaxiality, a second polarizer, and an illumination device-that are arranged in that order outside the second substrate.

1 more element

A liquid crystal display device, comprising:

a liquid crystal layer that is held between a first substrate and a second substrate, in which each of dots contains a reflective display region for reflective display and a transmissive display region for transmissivedisplay, the liquid crystal layer being composed of a nematic liquid crystal having a negative dielectric anisotropy;
a second retardation film having an optically positive uniaxiality, and a first polarizer that are arranged in that order outside the first substrate;
and
a third retardation film having an optically negative uniaxiality, a fourth retardation film having an optically positive uniaxiality, a second polarizer, and an illumination device that are arranged in that order outside the second substrate.

1 more element

Dependencies are inferred from the claim text.

Liquid crystal display device and electronic device

Life of this patent

Liquid crystal display device and electronic device

Life of this patent

Abstract

Claims27