LED light source and method of manufacturing the same

• US 9,207,491 B2
• Filed: 03/26/2014
• Issued: 12/08/2015
• Est. Priority Date: 09/20/2005
• Status: Active Grant

• Current Assignee: Renesas Electronics Corporation
• Original Assignee: Renesas Electronics Corporation
• Inventors: Isobe, Hiroyuki
• Primary Examiner(s): Nguyen, Ha Tran T
• Assistant Examiner(s): KLEIN, JORDAN M
• Application Number:
  US14/226,817
• Publication Number:
  US 20140204312A1
• Time in Patent Office: 622 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: F21K 9/90 Methods of manufacture
• CPC Class Codes: F21Y 2103/10 comprising a linear array of point-like light-generating elements
• CPC Class Codes: F21Y 2113/13 comprising an assembly of point-like light sources
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: G02F 1/133603 with LEDs
• CPC Class Codes: G02F 1/133621 providing coloured light G02F1/133617, G02F1/133533 take precedence
• 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 2224/48465 the other connecting portion not on the bonding area being a wedge bond, i.e. ball-to-wedge, regular stitch
• CPC Class Codes: H01L 24/97 the devices being connected to a common substrate, e.g. interposer, said common substrate being separable into individual assemblies after connecting
• CPC Class Codes: H01L 25/0753 the devices being arranged next to each other
• 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 2924/12041 LED
• CPC Class Codes: H01L 33/08 with a plurality of light emitting regions, e.g. laterally discontinuous light emitting layer or photoluminescent region integrated within the semiconductor body H01L27/15 takes precedence
• CPC Class Codes: H01L 33/36 characterised by the electrodes

Abstract

After the LEDs 2 (red LEDs (R), green LEDs (G) and blue LEDs (B), or white LEDs (W)) are mounted on the frame 3, without dicing the frame 3 for dividing the LEDs 2 into pieces, the tie bar is punched off to form an electric circuit. Thus, the RGB three primary color LED light source 1A or the white LED light source 1B that emits light in the state of the frame 3 can be manufactured.

Claims

1. A LED light source comprising:

a first electrode having a first side and a second side opposite to the first side;

a second and a fourth electrode arrayed along the first side of the first electrode;

a third and a fifth electrode arrayed along the along the second side of the first electrode;

a first LED chip having a first electrode surface and a second electrode surface opposite to the first electrode surface;

a second LED chip having a third electrode surface and a fourth electrode surface opposite to the third electrode surface;

a third LED chip having a fifth electrode surface and a sixth electrode surface opposite to the fifth electrode surface; and

a fourth LED chip having a seventh electrode surface and a eighth electrode surface opposite to the seventh electrode surface,

wherein the first LED chip and the third LED chip are arrayed along the first side of the first electrode,

wherein the second LED chip and the fourth LED chip are arrayed along the second side of the first electrode,

wherein the first electrode surface of the first LED chip, the third electrode surface of the second LED chip, the fifth electrode surface of the third LED chip, and the seventh electrode surface of the fourth LED chip are electrically connected to the first electrode,

wherein the second electrode surface of the first LED chip is electrically connected to the second electrode,

wherein the fourth electrode surface of the second LED chip is electrically connected to the third electrode,

wherein the sixth electrode surface of the third LED chip is electrically connected to the fourth electrode,

wherein the eighth electrode surface of the fourth LED chip is electrically connected to the fifth electrode,

wherein the first electrode, the second electrode, the third electrode, the first LED chip, and the second LED chip are aligned in a first direction,

wherein the first electrode, the fourth electrode, the fifth electrode, the third LED chip, and the fourth LED chip are aligned in the first direction,

wherein the first LED chip is sealed in a first resin,

wherein the second LED chip is sealed in a second resin,

wherein the third LED chip is sealed in a third resin, and

wherein the fourth LED chip is sealed in a fourth resin.

2. The LED light source according to claim 1,

wherein the first electrode surface of the first LED chip, the third electrode surface of the second LED chip, the fifth electrode surface of the third LED chip, and the seventh electrode surface of the fourth LED chip have a first polarity characteristic, and

wherein the second electrode surface of the first LED chip, the fourth electrode surface of the second LED chip, the sixth electrode surface of the third LED chip, and the eighth electrode surface of the fourth LED chip have a second polarity characteristic.

3. The LED light source according to claim 1,

wherein the first LED chip is a red LED, a blue LED, or a green LED,

wherein the second LED chip is a red LED, a blue LED, or a green LED,

wherein the third LED chip is a red LED, a blue LED, or a green LED, and

wherein the fourth LED chip is a red LED, a blue LED, or a green LED, and the red LED, the green LED, and the blue LED are arbitrarily arranged.

4. The LED light source according to claim 3,

wherein a ratio of a number of the red LED, the green LED, and the blue LED is 1:

2;

1.

5. The LED light source according to claim 3,

wherein the first electrode has a surface, and

wherein the red LED chip, the green LED chip, and the blue LED chip are mounted on the surface of the first electrode.

6. The LED light source according to claim 1,

wherein the first, second, third, and fourth LED chips are white LED chips comprising blue LED chips covered with phosphors.

7. A liquid crystal display device comprising:

a liquid crystal display element including a lamination of a first polarizing plate, a liquid crystal element, a color filter, a second polarizing plate, and a half mirror; and

a backlight element including a board, a plurality of LED light sources on the board, a diffusion plate over the LED light sources, and a plurality of prism sheets on the diffusion plate,

wherein the LED lights sources comprise

a first electrode having a first side and a second side opposite to the first side;

a second and a fourth electrode arrayed along the first side of the first electrode;

a third and a fifth electrode arrayed along the along the second side of the first electrode;

a first LED chip having a first electrode surface and a second electrode surface opposite to the first electrode surface;

a second LED chip having a third electrode surface and a fourth electrode surface opposite to the third electrode surface;

a third LED chip having a fifth electrode surface and a sixth electrode surface opposite to the fifth electrode surface; and

a fourth LED chip having a seventh electrode surface and a eighth electrode surface opposite to the seventh electrode surface,

wherein the first LED chip and the third LED chip are arrayed along the first side of the first electrode,

wherein the second LED chip and the fourth LED chip are arrayed along the second side of the first electrode,

wherein the first electrode surface of the first LED chip, the third electrode surface of the second LED chip, the fifth electrode surface of the third LED chip, and the seventh electrode surface of the fourth LED chip are electrically connected to the first electrode,

wherein the second electrode surface of the first LED chip is electrically connected to the second electrode,

wherein the fourth electrode surface of the second LED chip is electrically connected to the third electrode,

wherein the sixth electrode surface of the third LED chip is electrically connected to the fourth electrode,

wherein the eighth electrode surface of the fourth LED chip is electrically connected to the fifth electrode,

wherein the first electrode, the second electrode, the third electrode, the first LED chip, and the second LED chip are aligned in a first direction,

wherein the first electrode, the fourth electrode, the fifth electrode, the third LED chip, and the fourth LED chip are aligned in the first direction,

wherein the first LED chip is sealed in a first resin,

wherein the second LED chip is sealed in a second resin,

wherein the third LED chip is sealed in a third resin, and

wherein the fourth LED chip is sealed in a fourth resin.

8. The LED light source according to claim 7,

wherein the first electrode surface of the first LED chip, the third electrode surface of the second LED chip, the fifth electrode surface of the third LED chip, and the seventh electrode surface of the fourth LED chip have a first polarity characteristic, and

wherein the second electrode surface of the first LED chip, the fourth electrode surface of the second LED chip, the sixth electrode surface of the third LED chip, and the eighth electrode surface of the fourth LED chip have a second polarity characteristic.

9. The LED light source according to claim 7,

wherein the first LED chip is a red LED, a blue LED, or a green LED,

wherein the second LED chip is a red LED, a blue LED, or a green LED,

wherein the third LED chip is a red LED, a blue LED, or a green LED, and

wherein the fourth LED chip is a red LED, a blue LED, or a green LED, and the red LED, the green LED, and the blue LED are arbitrarily arranged.

10. The LED light source according to claim 9,

wherein a ratio of a number of the red LED, the green LED, and the blue LED is 1:

2;

1.