Lens composition of light emission diode device, LED device, backlight unit and liquid crystal display comprising the same

• US 20060188665A1
• Filed: 01/19/2006
• Published: 08/24/2006
• Est. Priority Date: 01/19/2005
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Lee, Sang-hoon, Choi, Jin-sung, Park, Jheen-hyeok, Kang, Eun-jeong, Song, Si-joon
• Granted Patent: US 7,510,747 B2
• Time in Patent Office: Days
• US Class Current: 428/1.600
• CPC Class Codes: C08G 61/06 prepared by ring-opening of carbocyclic compounds
• CPC Class Codes: C09K 2323/00 Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
• CPC Class Codes: C09K 2323/06 Substrate layer characterised by chemical composition
• CPC Class Codes: G02F 1/133603 with LEDs
• CPC Class Codes: H01L 2224/32245 the item being metallic
• CPC Class Codes: H01L 2224/32257 the layer connector connecting to a bonding area disposed in a recess of the surface of the item
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/48247 connecting the wire to a bond pad of the item
• CPC Class Codes: H01L 2224/73265 Layer and wire connectors
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/00012 Relevant to the scope of the group, the symbol of which is combined with the symbol of this group
• CPC Class Codes: H01L 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: H01L 2924/181 Encapsulation
• CPC Class Codes: H01L 33/56 Materials, e.g. epoxy or silicone resin

Abstract

Provided herein is a lens composition of an LED device for an LCD having high transparency and high heat resistance, and an LED device, a backlight unit and an LCD comprising the lens composition. The lens composition includes a copolymer represented by the formula 1 and having a weight average molecular weight of about 5,000 to about 500,000:
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.

Claims

1. A lens composition of a light emitting diode (LED) device for a liquid crystal display (LCD) comprising a copolymer represented by the formula 1 and having a weight average molecular weight of about 5,000 to about 500,000:

2. The lens composition of claim 1, wherein the copolymer is polymerized from monomers selected from the group consisting of 2-norbornene, 5-methyl-2-norbornene, 5-ethyl-2-norbornene, 5-butyl-2-norbornene, 5-propyl-2-norbornene, 5-phenyl-2-norbornene, 5-hexyl-2-norbornene, 5-octyl-2-norbornene, 5-nonyl-2-norbornene, 5-decyl-2-norbornene, 5-pentyl-2-norbornene, 5-methoxycarbonyl-2-norbornene, 5-ethoxycarbonyl-2-norbornene, 5-t-butoxycarbonyl-2-norbornene, 5-methyl-5-methoxycarbonyl-2-norbornene, or a combination comprising at least one of the foregoing monomers.

3. The lens composition of claim 1, wherein the copolymer is polymerized from monomers selected from the group consisting of ethylene, propylene, 1-butene, 1-hexene, 1-heptene, 1-octene, 1-nornene, 1-decene, 1-dodecene, or a combination comprising at least one of the foregoing monomers.

4. The lens composition of claim 1, wherein the copolymer has a melt index ranging from about 5 to about 60 grams/10 min.

5. The lens composition of claim 1, wherein the copolymer has a glass transition temperature ranging from about 90 to about 180°

C.

6. The lens composition of claim 1, wherein the copolymer has a transmittance of about 91% or greater over the wavelengths between about 300 and about 800 nm.

7. 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;

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.

8. The LED device of claim 7, wherein the copolymer is polymerized from monomers selected from the group consisting of 2-norbornene, 5-methyl-2-norbornene, 5-ethyl-2-norbornene, 5-butyl-2-norbornene, 5-propyl-2-norbornene, 5-phenyl-2-norbornene, 5-hexyl-2-norbornene, 5-octyl-2-norbornene, 5-nonyl-2-norbornene, 5-decyl-2-norbornene, 5-pentyl-2-norbornene, 5-methoxycarbonyl-2-norbornene, 5-ethoxycarbonyl-2-norbornene, 5-t-butoxycarbonyl-2-norbornene, 5-methyl-5-methoxycarbonyl-2-norbornene, or a combination comprising at least one of the foregoing monomers.

9. The LED device of claim 7, wherein the copolymer is polymerized from monomers selected from the group consisting of ethylene, propylene, 1-butene, 1-hexene, 1-heptene, 1-octene, 1-nornene, 1-decene, 1-dodecene, or a combination comprising at least one of the foregoing monomers.

10. The LED device of claim 7, wherein the copolymer has a melt index ranging from about 5 to about 60 g/10 min.

11. The LED device of claim 7, wherein the copolymer has a glass transition temperature ranging from about 90 to about 180°

C.

12. The LED device of claim 7, wherein the copolymer has a transmittance of 91% or greater over the wavelengths between about 300 and about 800 nm.

13. A backlight unit for an LCD comprising:

a light source comprising an LED device having 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 surrounding the chip, having one end of either lead frame exposed outside, and 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;

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;

a light guide plate positioned above the light source; and

a reflection plate disposed between the light guide plate and the light source and exposing the LED device.

14. The backlight unit of claim 13, wherein the copolymer is polymerized from monomers selected from the group consisting of 2-norbornene, 5-methyl-2-norbornene, 5-ethyl-2-norbornene, 5-butyl-2-norbornene, 5-propyl-2-norbornene, 5-phenyl-2-norbornene, 5-hexyl-2-norbornene, 5-octyl-2-norbornene, 5-nonyl-2-norbornene, 5-decyl-2-norbornene, 5-pentyl-2-norbornene, 5-methoxycarbonyl-2-norbornene, 5-ethoxycarbonyl-2-norbornene, 5-t-butoxycarbonyl-2-norbornene, 5-methyl-5-methoxycarbonyl-2-norbornene, or a combination comprising at least one of the foregoing monomers.

15. The backlight unit of claim 13, wherein the copolymer is polymerized from monomers selected from the group consisting of ethylene, propylene, 1-butene, 1-hexene, 1-heptene, 1-octene, 1-nornene, 1-decene, 1-dodecene, or a combination comprising at least one of the foregoing monomers.

16. The backlight unit of claim 13, wherein the copolymer has a melt index ranging from about 5 to about 60 g/10 min.

17. The backlight unit of claim 13, wherein the copolymer has a glass transition temperature ranging from about 90 to about 180°

C.

18. The backlight unit of claim 13, wherein the copolymer has a transmittance of about 91% or greater over the wavelengths between about 300 and about 800 nm.

19. A liquid crystal display (LCD) comprising:

a panel unit;

a driving unit; and

the backlight unit according to claim 13.