FLEXIBLE PRINTED CIRCUIT BOARD, BACKLIGHT UNIT USING THE SAME, AND LIQUID CRYSTAL DISPLAY DEVICE COMPRISING THE SAME

• US 20110134161A1
• Filed: 12/07/2010
• Published: 06/09/2011
• Est. Priority Date: 12/08/2009
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Dan, Kyung Sik, Lee, Se Min, Son, Ji Eun, Lee, Min Jin
• Granted Patent: US 8,884,935 B2
• Time in Patent Office: Days
• US Class Current: 345/690
• CPC Class Codes: G02B 6/0083 Details of electrical connections of light sources to drivers, circuit boards, or the like
• CPC Class Codes: H05K 1/0207 using internal conductor planes parallel to the surface for thermal conduction, e.g. power planes
• CPC Class Codes: H05K 1/0281 Reinforcement details thereof
• CPC Class Codes: H05K 1/189 characterised by the use of a flexible or folded printed circuit H05K3/326 takes precedence
• CPC Class Codes: H05K 2201/09681 Mesh conductors, e.g. as a ground plane
• CPC Class Codes: H05K 2201/09781 Dummy conductors, i.e. not used for normal transport of current; Dummy electrodes of components
• CPC Class Codes: H05K 2201/10106 Light emitting diode [LED]
• CPC Class Codes: H05K 3/0061 onto a metallic substrate, e.g. a heat sink heat sinks for electric apparatus H05K7/20

Abstract

A flexible printed circuit board (FPCB) capable of improving strength is disclosed, the FPCB comprising a base film; a copper layer on the base film, the copper layer including a circuit pattern, and a strength-reinforcing pattern in an area without the circuit pattern; and a coverlay film on the copper layer.

Claims

1. A flexible printed circuit board (FPCB) comprising:

a base film;

a copper layer on the base film, the copper layer including a circuit pattern, and a strength-reinforcing pattern in an area without the circuit pattern; and

a coverlay film on the copper layer.

2. The FPCB according to claim 1, wherein the strength-reinforcing pattern is a mesh structure, a plate structure, a stripe structure, or a quad-spiral structure.

3. The FPCB according to claim 1, further comprising a supporting member of a metal material adhered to a lower surface of the base film.

4. A backlight unit comprising:

a light-guiding plate with at least one side corresponding to a light-incidence face;

a first FPCB confronting the light-incidence face;

at least one LED for emitting light to the light-incidence face, the at least one LED positioned on one surface of the first FPCB;

a second FPCB connected to an opposite surface to the one surface of the first FPCB;

a connector for supplying externally-provided driving power to the at least one LED, the connector positioned on one surface of the second FPCB; and

an optical sheet for improving luminance of light advancing from the light-guiding plate.

5. The backlight unit according to claim 4, further comprising a supporting member adhered to the opposite surface to the one surface of the first FPCB, wherein the supporting member is formed of a metal material whose thermal conductivity is higher than a predetermined value.

6. The backlight unit according to claim 4, wherein each of the first and second FPCBs comprises:

a base film;

a copper layer on the base film, the copper layer including a circuit pattern, and a strength-reinforcing pattern in an area without the circuit pattern; and

a coverlay film on the copper layer.

7. The backlight unit according to claim 6, wherein the strength-reinforcing pattern is a mesh structure, a plate structure, a stripe structure, or a quad-spiral structure.

8. The backlight unit according to claim 4, wherein the backlight unit includes plural connectors, and the plural connectors are arranged on one surface of the second FPCB.

9. The backlight unit according to claim 4, wherein the second FPCB is formed as one body as the first FPCB, and a long side of the second FPCB is shorter than a long side of the first FPCB.

10. An LCD device comprising:

a liquid crystal panel for displaying images by controlling light transmittance; and

a backlight unit for emitting light to the liquid crystal panel, the backlight unit according to claim 4.