Patent ID: 7889288
Filing Date: 2011-02-15
Classification: G02F

Abstract:
1. A dual reflective liquid crystal display device comprising: a first substrate having a first polarizer and a first retardation layer, wherein the first polarizer and the first retardation layer are formed at an outer surface of the first substrate; a first light guide layer at an outer side of the first substrate, wherein the first light guide layer is provided with a step at one surface thereof; a first auxiliary light source formed at a lateral surface of the first substrate; a second substrate having a second polarizer and a second retardation layer, wherein the second polarizer and the second retardation layer are formed at an outer surface of the second substrate; a second light guide layer at an outer side of the second substrate, wherein the second light guide layer is provided with a step at one surface thereof; a second auxiliary light source formed at a lateral surface of the second substrate; and a pixel between the first and second substrates, the pixel having a thin film transistor, a first reflective layer on the first substrate, a second reflective layer on the second substrate, and the second retardation layer are formed at an outer surface of the second substrate, a liquid crystal layer between the first and second substrates, wherein the first reflection layer has an opening portion and a convex-concave shape to increase a reflection efficiency, and the second reflection layer corresponds to the opening portion of the first reflection layer, and the size of the second reflection layer is equal to or larger than the opening portion, wherein the second reflection layer is formed at an inner surface of the second substrate; wherein first light incident through the opening portion of the first reflective layer on the first substrate is reflected by the second reflective layer, to pass through the first substrate; and second light incident through the second substrate is reflected by the first reflective layer, to pass through the second substrate, and wherein the first and second auxiliary light sources are turned off when there is external light, and the first and second auxiliary light sources are turned on when there is no external light so that an user views image or information from both sides of the liquid crystal display device, and wherein the light provided from the first auxiliary light source incident through the first light guide layer is reflected by the second reflective layer so that a first image is viewed through the first light guide layer at an outer side of the first substrate, and the light provided from the second auxiliary light source incident through the second light guide layer is reflected by the first reflective layer so that a second image is viewed through the second light guide layer at an outer side of the second substrate, and the first image is the same image as the second image.