Liquid crystal display device
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorsHajime Kimura, Hideki Uochi
Life of this patent
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Abstract
It is an object of the present invention to provide a liquid crystal display device which has a wide viewing angle and less color-shift depending on an angle at which a display screen is seen and can display an image favorably recognized both outdoors in sunlight and dark indoors (or outdoors at night). The liquid crystal display device includes a first portion where display is performed by transmission of light and a second portion where display is performed by reflection of light. Further, a liquid crystal layer includes a liquid crystal molecule which rotates parallel to an electrode plane when a potential difference is generated between two electrodes of a liquid crystal element provided below the liquid crystal layer.
Claims10
A liquid crystal display device including a transmission portion and a reflection portion, the device comprising:
- a liquid crystal element including a pixel electrode in both of said portions and a first common electrode at least in the transmission portion, each having a light-transmitting property, a second common electrode having reflectiveness in the reflection portion, and a liquid crystal layer provided over the pixel electrode,
- wherein the pixel electrode is provided over the second common electrode with an insulating layer interposed therebetween in the reflection portion;
- and
- wherein the pixel electrode is provided over the first common electrode with the insulating layer interposed therebetween in the transmission portion;
- and
- wherein a second insulating layer scarcely having refractive index anisotropy is provided in the reflection portion.
A liquid crystal display device comprising:
- a liquid crystal element between a first substrate and a second substrate, which includes
- a pixel electrode having a light-transmitting property,
- a first common electrode having a light-transmitting property,
- a second common electrode having reflectiveness in a reflective portion of the liquid crystal element, and
- a liquid crystal layer provided between the pixel electrode and the second substrate;
- wherein the first common electrode and the second common electrode are provided over the first substrate;
- wherein the pixel electrode is provided over the first common electrode and the second common electrode with an insulating layer interposed therebetween, and
- wherein a second insulating layer scarcely having refractive index anisotropy is provided between the first substrate and the second substrate in the reflective portion.
Dependencies are inferred from the claim text.