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Researchers Submit Patent Application, "Printed Circuit Board, and Lighting Device and Backlight Unit Including the Same", for Approval

June 25, 2014



By a News Reporter-Staff News Editor at Electronics Newsweekly -- From Washington, D.C., VerticalNews journalists report that a patent application by the inventors HONG, Seung Kwon (Seoul, KR); PARK, Hyun Gyu (Seoul, KR); CHO, In Hee (Seoul, KR); LEE, Hyuk Soo (Seoul, KR), filed on November 27, 2013, was made available online on June 12, 2014.

The patent's assignee is Lg Innotek Co., Ltd.

News editors obtained the following quote from the background information supplied by the inventors: "Embodiments of the present invention relates to a printed circuit board, and a lighting device and backlight unit including the printed circuit board.

"According to the development of electronic device industries, various display devices have been developed, and an image device, a computer, a mobile communication terminal and the like using the display devices have been also developed. A liquid crystal display device which appeared according to this trend is catching on as a display device such as a monitor, a mobile communication terminal and the like.

"A liquid crystal display (LCD) is based on applying electrical and optical properties of liquid crystal having an intermediate property between liquid and solid to a display device, and serves to convert various kinds of electrical information generated from various devices into a visual information from using a variation in transmittance of the liquid crystal according to an applied voltage to transmits the information. The LCD is a widely used flat display because it has low power consumption due to its low operating voltage and is a conveniently portable device.

"Since the LCD has no self-luminous property for emitting light itself, a backlight is always needed for all the LCDs. The backlight serves as a light source of the LCD, and a backlight unit is a complex that forms a power circuit for drive of the light source as well as the light source for irradiating light to a rear surface of a liquid crystal module and all appendages which enable uniform flat light to form. As a light source for illuminating the LCD, the backlight unit using a light emitting diode (LED) has been recently suggested. The LED is a lighting emitting device which generates light using a light emitting phenomenon generated when a voltage is applied to a semiconductor. This LED has a small size and long lifespan compared to the conventional light source. Furthermore, since the LED directly converts electrical energy into light energy, it has high energy efficiency and a low operating voltage.

"As the liquid crystal display device configured as above becomes gradually slimmer, it has been needed to reduce a width of the liquid crystal display device. Accordingly, in order to reduce the width of the liquid crystal display device, a size of the backlight unit which has an effect on the width of the liquid crystal display device should be reduced. The size of the backlight unit can be reduced by reducing a pad part or a string part of a printed circuit board.

"FIG. 1 is a view illustrating a printed circuit board according to a conventional art.

"Referring to FIG. 1, the printed circuit board (PCB) includes a pad part 50 in which a plurality of light emitting devices 40 like LEDs are mounted, and a string part 60 in which a string wiring connected to the light emitting devices 40 and for transmitting an electric signal to the light emitting devices 40 is formed.

"When bending treatment is performed for the printed circuit board, an insulating substrate or the string wiring within a bending part 70 formed between the pad part 50 and the string part 60 is damaged such as being ripped or pressed. Due to this damage, a defect in electricity or appearance occurs, thereby causing damage to the printed circuit board.

"Accordingly, by forming the bending part not to have damage thereto and efficiently forming a wiring of the printed circuit board, a way for reducing a height of the liquid crystal display device has been needed."

As a supplement to the background information on this patent application, VerticalNews correspondents also obtained the inventors' summary information for this patent application: "An aspect of embodiments of the present invention provides a printed circuit board which can inhibit a connection wiring from being damaged by disposing the connection wiring connected to a wiring in a through hole of a bending part formed between a first area and a second area of a printed circuit board.

"An aspect of embodiments of the present invention also provides a printed circuit board that can inhibit a wiring from being damaged upon bending by forming the wiring on a rear surface of an area of the printed circuit board in which a light emitting device is mounted, and can minimize a width of the printed circuit board.

"According to an aspect of embodiments of the present invention, there is provided a printed circuit board, including: a support substrate including a first area in which a light emitting device is mounted, and a second area extending from the first area; a bending part which is configured such that a part between the first area and the second area is bent; a through hole passing through the bending part; a connection wiring connected to the light emitting device and disposed on the bending part; and a wiring connected to the connection wiring.

"According to an embodiment of the present invention, the printed circuit board may further include a pad part for connecting the light emitting device and the connection wiring.

"According to the embodiment of the present invention, the wiring may be disposed on the second area.

"According to the embodiment of the present invention, the printed circuit board may further include an insulating substrate formed on the support substrate.

"According to the embodiment of the present invention, the wiring may be formed on the insulating substrate.

"According to another aspect of the present invention, there is provided a printed circuit board, including: a support substrate including a first area in which a light emitting device is mount, and a second area extending from the first area; a bending part which is configured such that a part between the first area and the second area is bent; a connection wiring connected to the light emitting device, and disposed at one side end corresponding to another side end of the first area in which the bending part is formed; and a wiring connected to the connection wiring.

"According to another embodiment of the present invention, the printed circuit board may further include a first insulating substrate disposed at the support substrate located on one surface of the first area; and a second insulating substrate disposed at the support substrate located on another surface of the first area.

"According to the other embodiment of the present invention, the light emitting device may be mounted on the first insulating substrate.

"According to the other embodiment of the present invention, the printed circuit board may further include a pad part disposed on the first insulating substrate and for connecting the light emitting device and the connection wiring.

"According to the other embodiment of the present invention, the wiring may be disposed on the second insulating substrate.

"According to still another aspect of the present invention, there is provided a lighting device including each of the printed circuit boards which are configured as described above.

"According to still further another aspect of the present invention, there is provided a backlight unit including each of the printed circuit boards which are configured as described above.

BRIEF DESCRIPTION OF THE DRAWINGS

"The accompanying drawings are included to provide a further understanding of the present invention, and are incorporated in and constitute a part of this specification. The drawings illustrate exemplary embodiments of the present invention and, together with the description, serve to explain principles of the present invention. In the drawings:

"FIG. 1 is a view illustrating a printed circuit board according to a conventional art;

"FIG. 2 is a cross-sectional view illustrating a printed circuit board according to one exemplary embodiment of the present invention;

"FIG. 3 is a front view illustrating the printed circuit board of FIG. 2;

"FIG. 4 is a cross-sectional view illustrating a printed circuit board according to another embodiment of the present invention;

"FIG. 5 illustrates a front view of the printed circuit board of FIG. 4; and

"FIG. 6 illustrates a rear view of the printed circuit board of FIG. 4."

For additional information on this patent application, see: HONG, Seung Kwon; PARK, Hyun Gyu; CHO, In Hee; LEE, Hyuk Soo. Printed Circuit Board, and Lighting Device and Backlight Unit Including the Same. Filed November 27, 2013 and posted June 12, 2014. Patent URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&u=%2Fnetahtml%2FPTO%2Fsearch-adv.html&r=4251&p=86&f=G&l=50&d=PG01&S1=20140605.PD.&OS=PD/20140605&RS=PD/20140605

Keywords for this news article include: Electronics, Circuit Board, Lg Innotek Co. Ltd.

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Source: Electronics Newsweekly


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