Patent ID: 6443583
Filing Date: 2002-09-03
Classification: G02B

Abstract:
A backlight of a liquid crystal display device, comprising: a light pipe having a top surface, a bottom surface, and a light entering surface, wherein the top surface is connected to the light entering surface at a first boundary and the bottom surface is connected to the light entering surface at a second boundary;a light source facing the light entering surface; and a light source housing, including a light concentrating portion and a fixing portion; wherein the light concentrating portion has an inner space in which the light source is located, and has an opening facing the light entering surface; wherein the fixing portion is connected to the light concentrating portion at the opening and has a horizontal portion facing at least one of the top and bottom surfaces and a vertical portion covering at least one edge portion of the light entering surface in a vicinity of one of the first and second boundaries; and wherein a vertical distance (D) between the upper side of the light source housing and the top surface of the light pipe and a horizontal distance (F) between the light entering surface of the light pipe and the upper side of the opening of the light concentration is arranged such that a ratio of D/F is greater than one.