PRISM SHEET WITH SIZE- AND POSITION-ADJUSTED REFLECTION PATTERNS, BACK LIGHT UNIT HAVING THE PRISM SHEET, AND LIQUID CRYSTAL DISPLAY DEVICE HAVING THE BACK LIGHT UNIT

摘要

PURPOSE: A prism sheet having a reflection pattern, a backlight unit using the same, and a liquid crystal display device including the backlight unit are provided to maximize light efficiency by including a reflection pattern in which a size and a position are controlled. CONSTITUTION: A plurality of light condensing patterns(15) is arranged on a transparent substrate(10). A reflection pattern(20) is arranged in an opposite surface of a surface in which the light condensing pattern of the transparent substrate is arranged. A vertical separation distance between the light condensing pattern and the reflection pattern is the same at all positions. The transparent substrate is made of polyester resin. The reflection pattern reflects a light before the light is emitted to a specific position of the transparent substrate.