Phase delay element and a method of manufacturing a substrate and a manufacturing method thereof having the same, the light supply method using the same, and a liquid crystal display device

摘要

A phase delay element includes a brightness enhancement layer (40) intermediate a reflection layer (50) and an artificial light (10). The brightness enhancement layer (40) is defined by a first surface and an opposite second surface. The first surface faces the reflection layer (50). A first light from the artificial light is incident on the second surface. A phase of the first light is delayed by 1/4 phase (»/4) so that a second light is emitted from the first surface toward the reflection layer (50). The second light is reflected from the reflection layer so that a third light is emitted from the reflection layer (50) toward the first surface. A phase of the third light is delayed by 1/4 phase (»/4) so that a fourth light is emitted from the second surface. Therefore, a portion of the artificial light, which is reflected from the reflection layer (50), is recycled to improve a luminance of an LCD apparatus.