KR20080084175A - Back light unit - Google Patents

Back light unit Download PDF

Info

Publication number
KR20080084175A
KR20080084175A KR1020070025498A KR20070025498A KR20080084175A KR 20080084175 A KR20080084175 A KR 20080084175A KR 1020070025498 A KR1020070025498 A KR 1020070025498A KR 20070025498 A KR20070025498 A KR 20070025498A KR 20080084175 A KR20080084175 A KR 20080084175A
Authority
KR
South Korea
Prior art keywords
light
circuit board
frame
flexible circuit
light source
Prior art date
Application number
KR1020070025498A
Other languages
Korean (ko)
Inventor
조정민
Original Assignee
엘지이노텍 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 엘지이노텍 주식회사 filed Critical 엘지이노텍 주식회사
Priority to KR1020070025498A priority Critical patent/KR20080084175A/en
Publication of KR20080084175A publication Critical patent/KR20080084175A/en

Links

Images

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
    • G02B6/0083—Details of electrical connections of light sources to drivers, circuit boards, or the like
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
    • G02B6/0086—Positioning aspects
    • G02B6/0091—Positioning aspects of the light source relative to the light guide
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/133308—Support structures for LCD panels, e.g. frames or bezels
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00—Printed circuits
    • H05K1/02—Details
    • H05K1/0277—Bendability or stretchability details
    • H05K1/028—Bending or folding regions of flexible printed circuits

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Planar Illumination Modules (AREA)
  • Liquid Crystal (AREA)

Abstract

A backlight unit is provided to remove a non-adhesion portion of a light blocking tape by a flexible circuit board by inserting the flexible circuit board having a bent unit into an insertion unit of a frame, thereby improving light blocking effects. In a frame(100), an insertion unit is formed. A light blocking tape(200) is adhered along the frame. In a flexible circuit board(300), a bent unit is formed in a location corresponding to the insertion unit. In the flexible circuit board, a circuit for electrical transmission is printed. A light source is mounted in one side of the flexible circuit board. A light guide plate(500) is coupled with one side of the flexible circuit board and converts light of the light source into plane light.

Description

Back light unit

1 is a front view showing the configuration of a backlight unit according to the prior art.

FIG. 2 is an enlarged view of "a" of FIG. 1.

3 is a view showing the front configuration of the backlight unit according to the present invention.

4 is a diagram illustrating a rear structure of a backlight unit according to the present invention.

5 is an enlarged view of “b” of FIG. 3.

FIG. 6 is an enlarged view of "c" of FIG. 4.

FIG. 7 is an enlarged cross-sectional view of the section “d-d” of FIG. 3.

* Description of symbols on main parts of the drawings *

A-Backlight Unit 100-Frame

110-insertion part 120-light source

130-Border 200-Shading Tape

300-Flexible Circuit Board 310-Bend

400-light source 500-light guide plate

The present invention relates to a backlight unit.

In general, the liquid crystal display device is portable as one type of flat panel display element, and has been widely used in recent years because it has advantages of flat panel, thin film, low power consumption, and high image quality. However, since the LCD does not emit light and modulates the transmitted light only, a backlight unit should be provided at the rear of the LCD panel. The performance of the LCD is not only the LCD itself but the performance of the backlight used therein. Depends heavily on

BACKGROUND ART A backlight unit which is generally used includes a light source for generating light and a light guide plate for guiding the generated light to a liquid crystal display panel. The light source is positioned on one side (or both sides) of the light guide plate and is formed of a light emitting diode (LED).

Hereinafter, each component of the conventional backlight unit and its disadvantages will be described in detail with reference to the drawings.

1 is a front view illustrating a configuration of a backlight unit according to the prior art, and FIG. 2 is an enlarged view of "a" of FIG. 1.

As shown in FIG. 1, a conventional backlight unit includes a flexible circuit board 30 for transmitting current and various signals, a light source (not shown) mounted on one surface of the flexible circuit board 30, and the light source ( It includes a light guide plate 50 for receiving the light of the (not shown) and converting it into planar light, and a frame 10 for fixing and fastening the above-mentioned components.

In this case, a light shielding tape 20 is attached to the front surface of the frame 10, and is coupled to the liquid crystal panel (not shown) by adhesive force to the light shielding tape 20 to simultaneously block external light. That is, the light blocking tape 20 is a component for attaching the frame 10 combined with the respective components to a liquid crystal panel (not shown), and is generally applied as a double-sided tape.

However, in the conventional backlight unit having the structure as described above, as shown in FIG. 2, the flexible circuit board 30 is fastened to the front of the frame 10 so that the light blocking tape 20 is formed at the lower end of the frame 10. There is a problem that the adhesion is not easily removed when combined with the liquid crystal panel (not shown), as well as the light shielding effect is significantly reduced.

In addition, as the light-shielding tape is not attached to the lower end of the frame 10, the appearance may be poor due to the lifting of the frame 10 and the liquid crystal panel (not shown).

Accordingly, an object of the present invention is to provide a backlight unit that overcomes the disadvantages of lifting and blocking effects as the conventional light shielding tape is partially attached to the conventional light shielding tape.

In order to achieve the above object, the present invention provides a frame in which an insert is formed, a shading tape adhered along the frame, and a bent portion is formed at a position corresponding to the insert, and a printed circuit board is printed for electrical transmission. And a light guide plate coupled to one surface of the flexible circuit board and coupled to one surface of the flexible circuit board to convert light of the light source into planar light.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings such that those skilled in the art may easily implement the present invention.

3 is a view showing the front configuration of the backlight unit according to the present invention, Figure 4 is a view showing the rear configuration of the backlight unit according to the present invention, Figure 5 is an enlarged view "b" of FIG. 6 is an enlarged view of “c” of FIG. 4, and FIG. 7 is an enlarged cross-sectional view of a cross section of “dd” of FIG. 3.

3 to 7, the backlight unit A according to the present invention includes a frame 100, a light shielding tape 200 adhered along the frame 100, and a flexible circuit board for electrical transmission. The light guide plate 500 coupled to the light source 400 mounted on one surface of the flexible circuit board 300 and one surface of the flexible circuit board 300 converts the light of the light source 400 into planar light. Formed by dividing).

Frame 100 is a configuration for fixing and fastening the components to be described later, the insertion portion 110 is formed at the bottom as shown in Figure 7, the light source fixing portion 120 for fixing the light source as shown in Figure 4 Is formed.

The light shielding tape 200 is a configuration for bonding the backlight unit A and the liquid crystal panel (not shown) of the present invention and blocking external light, and is adhered along the edge 130 of the frame 100. In addition, the light shielding tape 200 is preferably composed of a double-sided tape having an adhesive force on both sides.

On the other hand, the light shielding tape 200 of the present invention is formed in a polygonal frame shape unlike the conventional light shielding tape to which only a portion (except for the lower end) is adhered all along the edge 130 of the frame 100, and thus the backlight of the present invention. When the unit A and the liquid crystal panel (not shown) are combined, the light blocking effect and floating can be suppressed.

The flexible printed circuit board 300 is printed with a circuit so as to transmit current and various signals, and one end is positioned in front of the frame 100 through the rear insertion unit 110 of the above-described frame as shown in FIG. The other end is not positioned to the rear of the frame (100). That is, the flexible circuit board coupled through the rear and front of the frame 100 may be fixed to the front and the rear of the frame 100 by being coupled to the bent portion 310 formed at the position combined with the insertion unit 110. Become.

On the other hand, the bent portion 310 is formed on the flexible circuit board 300 is located separately in the front and rear of the frame 100, the conventional flexible circuit board 30 as shown in Figure 1 is the frame 10 Although the adhesive area of the light shielding tape 20 decreases as the front surface of the light shielding tape 20 is positioned, the flexible printed circuit board 300 may be bent to form the frame 100 regardless of the adhesive area between the frame 100 and the light shielding tape 200. This is because the adhesive area of the light shielding tape 200 by the flexible circuit board 300 is not reduced as it is positioned at the front and rear surfaces.

The light source 400 is mounted on one surface of the flexible circuit board 300 to emit light in a direction parallel to the flexible circuit board 300, and is fixed to the light source fixing part 120 of the frame 100. In addition, the light source 400 is generally applied as an LED (Light Emitting Diode), it may be increased or decreased according to the size of the light guide plate 500 and the liquid crystal panel (not shown) to be described later. In this case, the light source 400 is not limited to the LED and may be replaced with any component as long as it can emit light.

The light guide plate 500 is configured to receive light from the light source 400 and change it into planar light. The light guide plate 500 includes light emitted from the light source 400 on one side end (rear lower end in this embodiment). One end is coupled to be in close contact with the light source 400 so that the light is received, it is configured to convert the light received at one end to the plane light to be transmitted to the liquid crystal panel (not shown).

Accordingly, the flexible circuit board 300 having the light source 400 mounted on one surface thereof is bent and inserted along the insertion unit 110 of the frame 100, and the light guide plate 500 is positioned at one side of the light source 400. The light blocking tape 200 is adhered along the edge 130 of the frame 100 to form the backlight unit A of the present invention.

The backlight unit A configured as described above is combined with the rear surface of the liquid crystal panel (not shown) by the light shielding tape 200 on the front of the frame 100 to input the light source 400 to the liquid crystal panel (not shown). And external light will be blocked.

As mentioned above, although this invention was demonstrated in detail using the preferable embodiment, the scope of the present invention is not limited to a specific embodiment and should be interpreted by the attached claim. In addition, those skilled in the art should understand that many modifications and variations are possible without departing from the scope of the present invention.

As described above, the backlight unit according to the present invention provides an effect of increasing the light blocking effect by inserting the flexible circuit board having the bent portion into the insertion portion of the frame, so that there is no unattached portion of the light shielding tape by the flexible circuit board.

In addition, as the unattached portion of the light-shielding tape disappears, the lifting phenomenon is prevented and thus the appearance is improved.

Claims (3)

A frame in which an insert is formed; A light shielding tape adhered along the frame; A flexible circuit board having a bent portion formed at a position corresponding to the insertion portion, and printed of a circuit for electric transmission; A light source mounted on one surface of the flexible circuit board; And A light guide plate coupled to one surface of the flexible circuit board to convert light of the light source into planar light; Backlight unit comprising a. The method of claim 1, One end of the flexible circuit board is inserted into the insertion unit is located in front of the frame, the other end is located in the rear of the frame. The method of claim 1, The light blocking tape is configured to have an adhesive force on both sides.
KR1020070025498A 2007-03-15 2007-03-15 Back light unit KR20080084175A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020070025498A KR20080084175A (en) 2007-03-15 2007-03-15 Back light unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020070025498A KR20080084175A (en) 2007-03-15 2007-03-15 Back light unit

Publications (1)

Publication Number Publication Date
KR20080084175A true KR20080084175A (en) 2008-09-19

Family

ID=40024573

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020070025498A KR20080084175A (en) 2007-03-15 2007-03-15 Back light unit

Country Status (1)

Country Link
KR (1) KR20080084175A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101556007B (en) * 2009-04-30 2010-10-13 达运精密工业（苏州）有限公司 Backlight module and display device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101556007B (en) * 2009-04-30 2010-10-13 达运精密工业（苏州）有限公司 Backlight module and display device

Similar Documents

Publication Publication Date Title
CN107209411B (en) Display device
KR100946444B1 (en) Flat type image display device
KR100824866B1 (en) Liquid crystal display
TWI389627B (en) Circuit board fixed structure and liquid crystal display device and electronic device using same
US7192176B2 (en) Backlight assembly for a hand-held liquid crystal display
US10234714B2 (en) Liquid crystal module and display device
KR101536126B1 (en) Liquid crystal display device
KR101274714B1 (en) Back light unit
US6512514B1 (en) Flat display device
KR20180071614A (en) Liquid crystal display device
KR20170070524A (en) Display
JP4592086B2 (en) Backlight device
KR20080084175A (en) Back light unit
CN102809089A (en) Planar light source apparatus and display apparatus
US20130033897A1 (en) Planer light source device and display device using the same
KR102186464B1 (en) Display module and display apparatus having the same
US20160223852A1 (en) Liquid crystal display device
JP5427228B2 (en) Display device and television receiver
US20140063415A1 (en) Liquid crystal display device
KR20090055986A (en) Display device
KR100941230B1 (en) Flat type image display device
KR101166583B1 (en) Structure of flexible printed circuit of liquid crystal display device using led back light
KR20080086285A (en) Liquid crystal display
JP2006330078A (en) Display apparatus and liquid crystal display apparatus
KR102350240B1 (en) Display device

Legal Events

Date Code Title Description
N231 Notification of change of applicant
WITN Withdrawal due to no request for examination