Method of illuminating liquid crystal layer and liquid crystal display device using the same
AssigneeSamsung Electronics Co., Ltd.
InventorsJeong-Hwan Lee, Kyu-Seok Kim
Life of this patent
Estimating the term…
Abstract
Disclosed are an LCD and a method of illuminating a liquid crystal layer. A protecting sheet is disposed on a reflection polarization film for enhancing the brightness. The protecting sheet is made of polyethylene terephthalate based material manufactured by an extension process to enhance the brightness, to improve visual angle and to prevent a Moire phenomenon. The LCD and the illumination method of the present invention enable high brightness displaying, color modulation depending on the visual angle and a relatively low manufacturing cost.
Claims19
A method of illuminating a liquid crystal layer, the method comprising:
- generating a light including a first light passing through a first polarizing axis and a second light passing through a second polarizing axis;
- changing a polarization of the second light such that the second light passes through the first polarizing axis;
- passing the first light and the changed second light through a third polarizing axis, the third polarizing axis allowing a brightness pattern repeated in a range of a first value and a second value depending on an angle between the third polarizing axis and the first polarizing axis, the first value being greater than the second value;
- controlling the angle between the third polarizing axis and the first polarizing axis such that the first light and the changed second light are transmitted as a third light having a brightness of a desired value equal to or greater than the second value and equal to or less than the first value;
- and
- providing the third light to a liquid crystal layer.
A liquid crystal display comprising:
- a light source for generating a light including a first light passing through a first polarizing axis and a second light passing through a second polarizing axis;
- a reflection polarization film having the first polarizing axis through which the first light passes and for changing a polarization of the second light such that the changed second light passes the reflection polarization film;
- a protection sheet disposed on the reflection polarization film, the protection sheet having a third polarizing axis, and passing therethrough the first light and the changed second light to have a brightness pattern repeated in a range of a first value to a second value depending on an angle between the third polarizing axis and the first polarizing axis, the first value being greater than the second value, and the angle being adjusted such that the first light and the changed second light are transmitted as a third light having a brightness of a desired value equal to or greater than the second value and equal to or less than the first value;
- and
- an LCD panel for receiving the third light to display an image.
Dependencies are inferred from the claim text.