Printed circuit board and display device including the same

Patent metadata

Field	Value
Publication number	US-10064267-B2
Application number	US-201615169311-A
Country	US
Kind code	B2
Filing date	May 31, 2016
Priority date	Oct 23, 2015
Publication date	Aug 28, 2018
Grant date	Aug 28, 2018

Abstract

A PCB underneath the display panel includes a plurality of insulation layers and one or more metal layers disposed between two adjacent insulation layers out of the plurality of insulation layers. A lower structure is disposed between the display panel and the PCB. At least a portion of a metal layer among the one or more metal layers that is most adjacent to the lower structure is exposed, and the lower structure is electrically connected to the exposed portion of the metal layer. Such exposed portion of the metal layer is electrically connected to the lower structure, so that the area where the PCB is referenced to the ground potential is increased. As a result, residual voltage, residual current in the PCB and noise caused by electromagnetic fields generated thereby can be reduced.

First claim

What is claimed is:

1. A display device comprising:
a display panel;
a printed circuit board (PCB) underneath the display panel and comprising a plurality of insulation layers and one or more metal layers between two adjacent insulation layers among the plurality of insulation layers; and
a lower structure between the display panel and the PCB,
wherein at least a portion of a metal layer among the one or more metal layers that is most adjacent to the lower structure is exposed, and
the lower structure is electrically connected to the exposed portion of the metal layer,
wherein the PCB comprises a driving unit or a communications unit and includes a plurality of vias, which overlap with the exposed portion of the metal layer and penetrate the one or more metal layers and the plurality of insulation layers,
wherein each of the vias is formed along a side surface of a through-hole in the PCB and is in contact with all of the metal layers, and
wherein the metal layer discharges residual voltage and residual current from a periphery to the lower structure to reduce noise that the residual voltage and the residual current affecting the driving unit or the communications unit.

2. The display device of claim 1 , wherein the exposed portion of the metal layer is at a periphery of an outer surface of the PCB.

3. The display device of claim 1 , wherein the PCB further includes a fixing screw to fix the PCB and the lower structure, and a ground hole that allows electrical connection to the lower structure.

4. The display device of claim 1 , further comprising:
a conductive adhesive pad between the exposed portion of the metal layer and the lower structure.

5. The display device of claim 4 , wherein the conductive adhesive pad is a metal paste.

6. The display device of claim 1 , wherein the lower structure includes a protrusion that contacts with the exposed portion of the metal layer directly.

7. The display device of claim 1 , wherein the PCB further includes a driving unit or a communications unit, and the driving unit or the communications unit is disposed between a bottom surface of the lower structure and a top surface of the PCB.

8. The display device of claim 1 , wherein a width of cross section of the vias is smaller than a width of the exposed portion of the metal layer.

9. A display device comprising:
a display panel;
a printed circuit board (PCB) configured to carry signals to the display panel; and
a lower structure configured to support the display panel and the PCB,
wherein the PCB includes a metal layer configured to allow discharge of electromagnetic fields at a periphery of the PCB to the lower structure,
wherein the PCB comprises a driving unit or a communications unit, and
wherein the metal layer discharges residual voltage and residual current from the periphery to the lower structure to reduce noise that the residual voltage and the residual current affecting the driving unit or the communications unit.

10. The display device of claim 9 , further comprising:
a plurality of insulation layers each in contact with either surface of the metal layer,
wherein an insulation layer among the plurality of insulation layers that is adjacent to the lower structure is configured to allow at least a portion of the metal layer to be electrically connected to the lower structure.

11. A printed circuit board (PCB) comprising:
a plurality of insulation layers; and
at least one metal layer between two adjacent insulation layers among the plurality of insulation layers,
a plurality of vias penetrating the at least one metal layer and the plurality of insulation layers,
wherein at least a portion of a bottom surface of a metal ground layer that is a lowest layer among the at least one metal layer is exposed,
wherein the plurality of vias are overlapped with the exposed portion of the bottom surface of the metal layer, and
wherein each of the vias is made up of a metal layer formed along a side surface of a through-hole in the PCB and is in contact with all of the metal layers.

12. The PCB of claim 11 , wherein an insulation layer disposed to contact with the bottom surface of the metal ground layer exposes a periphery of the metal ground layer.

13. The PCB of claim 11 , wherein a width of cross section of the vias is smaller than a width of the exposed portion of the metal layer.

Assignees

• Lg Display Co Ltd

Inventors

• Pyun Unseung

Classifications

• H05K2201/10409

  Screws · CPC title

• G02F1/13

  based on liquid crystals, e.g. single liquid crystal display cells · CPC title

• H05K1/144

  Stacked arrangements of planar printed circuit boards · CPC title

• H05K2201/10128

  Display · CPC title

• H05K1/147

  at least one of the printed circuits being bent or folded, e.g. by using a flexible printed circuit (H05K1/148 takes precedence) · CPC title