US 7,510,747 B2
Lens composition of light emission diode device, LED device, backlight unit and liquid crystal display comprising the same
Jin-sung Choi, Cheonan-si (Korea, Republic of); Jheen-hyeok Park, Seongnam-si (Korea, Republic of); Sang-hoon Lee, Yongin-si (Korea, Republic of); Si-joon Song, Yongin-si (Korea, Republic of); and Eun-jeong Kang, Asan-si (Korea, Republic of)
Assigned to Samsung Electronics Co., Ltd., (Korea, Republic of)
Filed on Jan. 19, 2006, as Appl. No. 11/335,404.
Claims priority of application No. 10-2005-0005047 (KR), filed on Jan. 19, 2005.
Prior Publication US 2006/0188665 A1, Aug. 24, 2006
Int. Cl. G02B 1/04 (2006.01)
U.S. Cl. 428—1.1  [257/98] 13 Claims
OG exemplary drawing
 
1. A light emitting diode (LED) device for an LCD comprising:
lead frames composed of a cathode and an anode, respectively;
a chip positioned on the cathode lead frame;
a metal wire connecting the chip and the anode lead frame; and
a lens comprising a lens composition comprising a copolymer represented by the formula 1 and having a weight average molecular weight of about 5,000 to about 500,000:

OG Complex Work Unit Drawing
wherein R1 and R2 independently represent a hydrogen atom, a linear, branched or cyclic alkyl group having 1 to 10 carbon atoms or —COOR3 group in which R3 represents a linear, branched or cyclic alkyl group having 1 to 10 carbon atoms, R4 and R5 independently represent a hydrogen atom or an alkyl group having 1 to 10 carbon atoms, the ratio n/n+m ranges from about 0.3 to about 0.995, and the ratio m/n+m ranges from about 0.005 to about 0.7, wherein the lens surrounds the chip, having one end of either lead frame exposed outside, and the lens contacts the chip.