Light emitting diode backlight module and liquid crystal display

• US 7,989,829 B2
• Filed: 12/26/2006
• Issued: 08/02/2011
• Est. Priority Date: 12/23/2005
• Status: Active Grant

• Current Assignee: InnoLux Corporation
• Original Assignee: InnoLux Corporation
• Inventors: Tung, Chien-Fan, Yang, Kun-Hsien
• Primary Examiner(s): Jackson, Jr.; Jerome
• Application Number:
  US11/645,456
• Publication Number:
  US 20070146573A1
• Time in Patent Office: 1,680 Days
• Field of Search: 257/98
• US Class Current: 257/98
• CPC Class Codes: H01L 33/54 having a particular shape
• CPC Class Codes: H01L 33/58 Optical field-shaping elements
• CPC Class Codes: H01L 33/60 Reflective elements

Abstract

An exemplary light emitting diode (200) includes a base (18), a semiconductor chip (20), a cover (28), and two optical layers (30). The semiconductor chip is formed on the base. The cover is formed on the base and covers the semiconductor chip. The optical layers cover part of a peripheral side of the cover respectively.

Claims

1. A light emitting diode package, comprising:

a base;

a semiconductor chip formed at the base for providing light beams;

an encapsulating cover for sealing the semiconductor chip, the encapsulating cover comprising a lateral surface surrounding the semiconductor chip and a top surface above the semiconductor chip; and

two optical layers being capable of blocking the light beams and covering two opposite parts of the lateral surface of the encapsulating cover respectively and exposing another two opposite parts of the lateral surface of the encapsulating cover to define two intervals between the two optical layers;

wherein at least part of the light beams emitted by the semiconductor chip towards the lateral surface are transmitted out of the light emitting diode package through the intervals along at least two lateral directions.

2. The light emitting diode package as claimed in claim 1, wherein the encapsulating cover comprises two curve portions located in the lateral surface and arranged opposite to each other.

3. The light emitting diode package as claimed in claim 2, wherein the optical layers are formed at the curve portions.

7. The light emitting diode package as claimed in claim 1, wherein the encapsulating cover comprises an upper part, a lower part and a waist, the upper part and the lower part adjoin each other, the waist is located at a position where the upper part joins the lower part, and the lower part covers the semiconductor chip.

8. The light emitting diode package as claimed in claim 7, wherein the upper part and the lower part have curved lateral surfaces respectively, and the curved lateral surfaces cooperatively form the lateral surface of the encapsulating cover.

9. The light emitting diode package as claimed in claim 1, wherein the two optical layers are reflective layers.

10. The light emitting diode package as claimed in claim 1, wherein the two optical layers are light absorbing layers.

4. A liquid crystal display, comprising:

a backlight module comprising a plurality of light emitting diodes, each of the light emitting diodes having a semiconductor chip for emitting light beams, an encapsulating cover sealing the semiconductor chip, and two optical layers formed on the encapsulating cover, each of the optical layers configured for blocking light beams incident thereon; and

a liquid crystal panel arranged at the backlight module;

wherein the encapsulating cover comprises a lateral surface surrounding the semiconductor chip and a top surface above the semiconductor chip, the two optical layers cover two opposite parts of the lateral surface of the encapsulating cover respectively and exposing another two opposite parts of the lateral surface of the encapsulating cover to define two opposite intervals between the two optical layers, the intervals of each color emitting diode are arranged along a same line, and at least part of the light beams emitted by the semiconductor chip towards the lateral surface are transmitted out of the light emitting diode package through the intervals along at least two lateral directions.

5. The liquid crystal display as claimed in claim 4, wherein the encapsulating cover comprises two curve portions located in the lateral surface and arranged opposite to each other.

6. The liquid crystal display as claimed in claim 5, wherein the optical layers are formed at the curve portions.

11. The liquid crystal display as claimed in claim 4, wherein the encapsulating cover comprises an upper part, a lower part and a waist, the upper part and the lower part adjoin each other, the waist is located at a position where the upper part joins the lower part, and the lower part covers the semiconductor chip.

12. The liquid crystal display as claimed in claim 11, wherein the upper part and the lower part have curved lateral surfaces respectively, and the curved lateral surfaces cooperatively form the lateral surface of the encapsulating cover.

13. The liquid crystal display as claimed in claim 11, wherein a horizontal projective area of the waist is less than a horizontal projective area of the upper part, and is less than a horizontal projective area of the lower part.

14. The liquid crystal display as claimed in claim 4, wherein the two optical layers are reflective layers.

15. The liquid crystal display as claimed in claim 4, wherein the two optical layers are light absorbing layers.

16. A light emitting diode string, comprising:

a plurality of light emitting diodes arranged along a line, each light emitting diode comprising;

a base;

a semiconductor chip formed at the base for providing light beams;

an encapsulating cover sealing the semiconductor chip, the encapsulating cover comprising a lateral surface surrounding the semiconductor chip and a top surface above the semiconductor chip; and

two optical layers being capable of blocking the light beams and covering two opposite parts of the lateral surface of the encapsulating cover respectively and exposing another two opposite parts of the lateral surface of the encapsulating cover to define two intervals between the two optical layers;

wherein the intervals of each light emitting diode are arranged along a same line, and at least part of the light beams emitted by the semiconductor chip towards the lateral surface are transmitted out of the light emitting diode package through the intervals along at least two lateral directions.

17. The light emitting diode string as claimed in claim 16, wherein the encapsulating cover of each light emitting diode comprises two curve portions located in the lateral surface and arranged opposite to each other, and the optical layers are formed at the curve portions.

18. The light emitting diode string as claimed in claim 17, wherein the encapsulating cover comprises an upper part, a lower part and a waist, the upper part and the lower part adjoin each other, the waist is located at a position where the upper part joins the lower part, the lower part covers the semiconductor chip, and the upper part and the lower part have curved lateral surfaces respectively, and the curved portions cooperatively form the lateral surface of the encapsulating cover.

19. The light emitting diode string as claimed in claim 16, wherein the two optical layers are reflective layers.

20. The light emitting diode string as claimed in claim 16, wherein the two optical layers are light absorbing layers.