KR20150030080A - Backlight unit and liquid crystal display including the same - Google Patents

Backlight unit and liquid crystal display including the same Download PDF

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Publication number
KR20150030080A
KR20150030080A KR20130109302A KR20130109302A KR20150030080A KR 20150030080 A KR20150030080 A KR 20150030080A KR 20130109302 A KR20130109302 A KR 20130109302A KR 20130109302 A KR20130109302 A KR 20130109302A KR 20150030080 A KR20150030080 A KR 20150030080A
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KR
South Korea
Prior art keywords
light source
guide plate
circuit board
light
region
Prior art date
Application number
KR20130109302A
Other languages
Korean (ko)
Inventor
송범석
Original Assignee
엘지디스플레이 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 엘지디스플레이 주식회사 filed Critical 엘지디스플레이 주식회사
Priority to KR20130109302A priority Critical patent/KR20150030080A/en
Publication of KR20150030080A publication Critical patent/KR20150030080A/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/60—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
    • F21K9/61—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction using light guides
    • 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
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0045—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide
    • G02B6/0046—Tapered light guide, e.g. wedge-shaped light guide
    • 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
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0051—Diffusing sheet or layer
    • 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
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0053—Prismatic sheet or layer; Brightness enhancement element, sheet or layer
    • 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
    • G02B6/0066—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 characterised by the light source being coupled to the light guide
    • G02B6/0073—Light emitting diode [LED]
    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]

Abstract

A backlight unit capable of preventing light leakage and improving image quality and a liquid crystal display including the same are provided. The backlight unit includes: a light source composed of one or more light emitting diodes; A wedge-shaped light guide plate disposed adjacent to the light source and having an area adjacent to the light source that is thicker than the remaining area; And a flexible circuit board on which the light source is mounted and which is formed by extending one side of the light guide plate so as to overlap with an upper surface of the light source adjacent to the light source.

Description

BACKLIGHT UNIT AND LIQUID CRYSTAL DISPLAY DEVICE COMPRISING THE SAME

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backlight unit, and more particularly, to a backlight unit capable of preventing light leakage in a backlight unit using a wedge-type light guide plate and a liquid crystal display including the same.

2. Description of the Related Art Recently, mobile terminals for information communication media such as a notebook computer, a laptop computer, and a personal digital assistant (PDA) (EDPS). In addition, mobile terminals, such as a mobile phone and a navigation system, which are specialized for their use, are also widely used.

As a display of such a mobile terminal, a liquid crystal display device (LCD) capable of providing excellent contrast and color reproducibility and capable of mass production is mainly used. Liquid crystal display devices are becoming more and more widespread due to features such as light weight, thinness and low power consumption driving. According to this trend, liquid crystal display devices are used in office automation equipment, audio / video equipment, and the like.

Such a liquid crystal display device displays a desired image on a screen by controlling the amount of transmission according to a video signal applied to a plurality of control switches arranged in a matrix form.

In addition, since the liquid crystal display device is not a self-luminous display device, a backlight unit for providing light to the backside of the liquid crystal display panel on which an image is displayed is provided.

FIG. 1 is a schematic plan view of a liquid crystal display device used in a conventional mobile terminal, and FIG. 2 is a sectional view taken along line II-II 'in FIG.

1 and 2, a conventional liquid crystal display device 1 includes a display area A / A for displaying an image and a non-display area N / A formed to surround the display area A / A, and the non-display area N / A is obscured by a case or the like.

Such a liquid crystal display device 1 includes a liquid crystal display panel 10, a backlight unit 20 thereunder and a plurality of storage containers such as a support main 30 and a bottom cover 35 for housing them.

The edges of the liquid crystal display panel 10 and the backlight unit 20 are fixed by the support main body 30 and the bottom cover 35 accommodates the backlight unit 20.

The support main body 30 is formed in a substantially rectangular frame shape and is coupled to the bottom cover 35. A light source of the backlight unit (20) is disposed inside at least one of the support main (30).

A reflective sheet 23 is seated on the lower portion of the support main body 30 and a light guide plate 24 and a plurality of optical sheets 25 are arranged on the reflective sheet 23 in order.

The liquid crystal display panel 10 includes an array substrate 11 and a color filter substrate 12. Polarizing plates 13 and 14 are attached to the outer sides of the two substrates,

A first flexible circuit board 15 connected to an external driving circuit (not shown) for transmitting a driving signal of the liquid crystal display panel 10 is disposed on one side of the array substrate 11.

The backlight unit 20 includes a light source 21, a second flexible printed circuit board 22, a light guide plate 24, a reflective sheet 23, and a plurality of optical sheets 25.

The light sources 21 are arranged side by side on one side of the light guide plate 24. The light source 21 is mounted on the second flexible printed circuit board 22 and emits light to the light incoming surface of the light guide plate 24.

Here, the light source 21 uses a high-brightness light emitting diode (LED), and is operated by a driving signal provided from an external backlight driving circuit (not shown) through the second flexible circuit board 22 to emit white light.

A light source 21 is mounted on the rear surface of the second flexible printed circuit board 22 and a plurality of wires (not shown) are formed for connecting the backlight driving circuit and the light source 21 to each other.

The light guide plate 24 is a wedge-shaped light guide plate having a thickest thickness on one side adjacent to the light source 21 and a thinner plate than the one side in the other area.

The structure of the light guide plate 24 reduces the thickness of the entire liquid crystal display 1 by placing the optical sheet 25 on the thin portion of the light guide plate 24.

However, in the conventional liquid crystal display device 1 having the above-described wedge-shaped light guide plate 24, light of high luminance, that is, white light from the light source 21 at the portion where the wedge portion WG of the light guide plate 24 is formed, A light leakage phenomenon occurs.

That is, the white light emitted from the light source 21 must be incident on the liquid crystal display panel 10 through the light guide plate 24 and the optical sheet 25. In the conventional liquid crystal display device 1, There arises a problem that light leakage of white light emitted from the light source 21 occurs at the portion WG to degrade image quality.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a backlight unit capable of preventing light leakage and improving image quality and a liquid crystal display device including the backlight unit.

According to an aspect of the present invention, there is provided a backlight unit including: a light source including at least one light emitting diode; A wedge-shaped light guide plate disposed adjacent to the light source and having an area adjacent to the light source that is thicker than the remaining area; And a flexible circuit board on which the light source is mounted and which is formed by extending one side of the light guide plate so as to overlap with an upper surface of the light source adjacent to the light source.

According to an aspect of the present invention, there is provided a liquid crystal display comprising: a liquid crystal panel; And a backlight unit disposed below the liquid crystal panel and supplying light to the liquid crystal panel, wherein the backlight unit includes: a light source configured by one or more light emitting diodes; A wedge-shaped light guide plate disposed adjacent to the light source and having an area adjacent to the light source that is thicker than the remaining area; And a flexible circuit board on which the light source is mounted and which is formed by extending one side of the light guide plate so as to overlap with an upper surface of the light source adjacent to the light source.

According to the backlight unit of the present invention and the liquid crystal display device including the same, one side of the flexible circuit board on which the light source is mounted is formed so as to cover the upper surface of the wedge portion of the light guide plate, whereby light emitted from the light source, The phenomenon can be prevented.

Further, by reducing the restoring force of the flexible circuit board by removing the coverlay layer from the extended region of the flexible circuit board overlapping with the wedge portion of the light guide plate and covering the extension region of the flexible circuit board using the optical sheet, So that the light leakage phenomenon can be prevented.

1 is a schematic plan view of a liquid crystal display device used in a conventional mobile terminal.
Fig. 2 is a cross-sectional view of Fig. 1 taken along line II-II '.
3 is an exploded perspective view of a liquid crystal display device according to an embodiment of the present invention.
Fig. 4 is a cross-sectional view of Fig. 3 taken along lines IV-IV '.
5 is a perspective view of the second flexible printed circuit board shown in FIG.
FIG. 6 is a cross-sectional view of FIG. 5 taken along line VI-VI '.

Hereinafter, a backlight unit and a liquid crystal display according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 3 is an exploded perspective view of a liquid crystal display device according to an embodiment of the present invention, and FIG. 4 is a sectional view taken along line IV-IV 'of FIG.

3 and 4, the liquid crystal display 100 according to the present invention includes a liquid crystal panel 110, a backlight unit 130, and storage containers such as a support main 170 and a bottom cover 200 can do.

The liquid crystal panel 110 may display an image and may include an array substrate 111 and a color filter substrate 112 which are bonded to each other with a uniform cell gap. A liquid crystal layer (not shown) is formed between the array substrate 111 and the color filter substrate 112. Polarizing plates 117 and 118 are attached to the upper and lower surfaces of the liquid crystal panel 110, respectively. The side of the liquid crystal panel 110 may be supported on the support main 170.

A plurality of gate lines (not shown) and a plurality of data lines (not shown) intersect each other to define pixels, and a thin film transistor (not shown) is provided for each of the intersecting regions to form pixel electrodes Quot;).

The color filter substrate 112 includes a black matrix (not shown) that covers the R, G, and B color filters (not shown) corresponding to each pixel and the gate lines, the data lines, and the thin film transistors, And a common electrode (not shown) covering the electrode.

The first flexible circuit board 115 to which various signals such as a data signal and a control signal are applied may be positioned at an edge of the liquid crystal panel 110, for example, an edge of the array substrate 111.

The first flexible circuit board 115 may be formed using a heat resistant plastic film such as PET (polyester) or PI (polyimide), which is a flexible material, as a circuit substrate on which circuits are formed on a flexible film. The flexibility of the first flexible circuit board 115 is advantageous in that the space can be effectively used and stereoscopic wiring can be performed.

A drive driver 113 may be mounted on the junction between the first flexible printed circuit board 115 and the liquid crystal panel 110. That is, it is possible to generate a driving signal for driving the liquid crystal panel 110 by receiving an external signal from the first flexible printed circuit board 115 and using the external signal to operate the driving driver 113.

The backlight unit 130 may be positioned below the liquid crystal panel 110 to supply light to the liquid crystal panel 110. The backlight unit 130 may be housed within the bottom cover 200, and some of the components may be supported by the support main 170.

The backlight unit 130 may include a light source 180 and a light guide plate 150.

The light source 180 may be composed of a plurality of light emitting diodes (LEDs), which may be mounted on a flexible circuit board, for example, a second flexible circuit board 190, have.

The light source 180 may be mounted on the rear surface of the second flexible circuit board 190 and the light emitting unit of the light source 180 may be disposed adjacent to the light incident surface of the light guide plate 150.

A plurality of wiring patterns (not shown) may be formed on the second flexible circuit board 190 to supply a driving signal provided from an external backlight driving circuit (not shown) to the light source 180. The second flexible circuit board 190 may be formed in the form of a heat-resistant plastic film such as PET or PI, which is a flexible material.

The light guide plate 150 may be disposed so that the light incident surface is adjacent to the light source and housed in the bottom cover 200. [ The light guide plate 150 can guide the light emitted from the light source 180 to the upper side, that is, toward the liquid crystal panel 110. The light guide plate 150 may be formed of PMMA (poly methyl methacrylate).

The light guide plate 150 may be a wedge-type light guide plate 150 having a thick region adjacent to the light source 180.

In other words, the light guide plate 150 may include a first region, a second region, and a third region. The first region may be a region adjacent to the light source 180 and may have a thickness greater than that of the remaining region. At this time, the thickness of the first region may be the same as the height of the light emitting diodes constituting the light source 180. For example, the thickness of the first region of the light guide plate 150 may be approximately 0.6 mm.

The second region may be a region formed in a plate shape having a thickness smaller than that of the first region, and may be a region where the optical sheets 140 are seated on the upper surface. Here, the thickness of the second region of the light guide plate 150 may be approximately 0.4 mm.

The third region may be formed between the first region and the second region to connect the two regions, and may have a thickness gradually decreasing from the first region to the second region. Here, the third region may be defined as a wedge portion WG of the light guide plate 150. [

Meanwhile, the second flexible printed circuit board 190 described above may be formed so that one side thereof overlaps with a part of the upper surface of the light guide plate 150.

FIG. 5 is a perspective view of the second flexible printed circuit board shown in FIG. 3, and FIG. 6 is a sectional view taken along line VI-VI 'of FIG.

4 to 6, the second flexible printed circuit board 190 may include a base film 191, a conductive layer 192, and a coverlay layer 193. The second flexible circuit board 190 may have a one-layer structure.

The base film 191 may be formed of a flexible material, that is, in the form of a plastic film such as PET, PI, or the like described above.

The conductive layer 192 may be formed of a conductive metal film. The conductive film 192 may be formed on one side of the base film 191, for example, the lower surface thereof to form a wiring pattern of the second flexible circuit board 190.

The coverlay layer 193 may be a protective layer covering and protecting the conductive layer 192. Here, the coverlay layer 193 may be formed thicker than the base film 191 and the conductive layer 192.

The second flexible printed circuit board 190 may include a light source area 190a and an extended area 190b.

The light source region 190a is a region where the light source 180 is located, and a plurality of light emitting diodes may be mounted on the rear surface. Each of the plurality of light emitting diodes may be connected to the conductive layer 192 of the light source region 190a.

The extended region 190b may extend from one side of the light source region 190a to the upper surface of the light guide plate 150, for example, the upper surface of the wedge portion WG of the light guide plate 150. [ Here, the extension region 190b may be formed only in the region without the conductive layer 192, that is, the base film 191 and the coverlay layer 193.

That is, the second flexible printed circuit board 190 according to the present invention may be formed by extending the extended region 190b to cover the first region and the third region of the light guide plate 150, It is possible to prevent a light leakage phenomenon in which light emitted through the first area or the third area of the light guide plate 150 is leaked. An adhesive material such as a double-sided tape or the like may be further formed between the extended region 190b of the second flexible printed circuit board 190 and the first and third regions of the light guide plate 150. [

In addition, a part of the extended region 190b of the second flexible printed circuit board 190 may be overlaid on the optical sheets 140, for example, the prism sheet 143. [

In other words, one side of the prism sheet 143 may be formed to extend to a direction in which the second flexible printed circuit board 190 is disposed, that is, an upper surface of the wedge portion WG of the light guide plate 150.

The elongated prism sheet 143 is overlapped with the extended region 190b of the second flexible circuit board 190 so that the extended region 190b is in contact with the wedge portion WG of the light guide plate 150, .

This prevents the extension region 190b of the second FPC 190 from being lifted from the upper surface of the light guide plate 150 due to the heat generated by the operation of the light source 180, It is possible to prevent light leakage of the light. Here, an adhesive material such as a double-sided tape may be further formed on a portion where the prism sheet 143 and the extended region 190b of the second flexible circuit board 190 overlap.

In the present invention, instead of the prism sheet 143, the diffusion sheet 141 is extended to the upper surface of the wedge portion WG of the light guide plate 150 so as to overlap the extended region 190b of the second flexible circuit board 190 It is possible.

Also, as shown in FIG. 6, the second FPC 190 according to the present invention can remove the coverlay layer 193 from the extended region 190b. Thus, only the base film 191 remains in the extended region 190b.

In other words, the lower cover layer 193 can be removed so that the extended region 190b of the second flexible printed circuit board 190 can be closely contacted with the upper surface of the wedge portion WG of the light guide plate 150, have.

As the coverlay layer 193 is thus removed from the extended region 190b, the restoring force in the extended region 190b is reduced compared to the light source region 190a so that the extended region 190b is brought into close contact with the upper surface of the light guide plate 150 .

As described above, since the prism sheet 143 covers the extended area 190b, the extended area 190b of the second flexible printed circuit board 190 is further extended to the upper surface of the wedge portion WG of the light guide plate 150 Can be brought into close contact with each other.

That is, the second flexible circuit board 190 according to the present invention is formed by firstly light leakage phenomenon by the extended region 190b extending from one side of the upper surface of the light guide plate 150 to the upper surface of the wedge portion WG of the light guide plate 150, Can be prevented.

The cover layer 193 is removed to reduce the restoring force so that the extended region 190b does not protrude from the upper surface of the light guide plate 150 and then overlapped by the prism sheet 143 to cover the extended region 190b, It can prevent light leakage phenomenon by car.

6, the second flexible printed circuit board 190 has a single-layer structure, but the present invention is not limited thereto. For example, the second flexible circuit board 190 may be a multi-layer structure in which a conductive layer 192 is formed on the upper and lower surfaces of the base film 191, and a coverlay layer 193 is formed on each of the conductive layers 192 have. In the second flexible circuit board 190 having such a multilayer structure, the conductive layer 192 is not formed on the extended region 190b. As a result, the extended region 190b is formed on the upper surface of the light guide plate 150 The coverlay layer 193 on the upper and lower surfaces of the base film 191 may be removed so that the restoring force may be reduced.

4, the backlight unit 130 of the present invention includes a plurality of optical sheets 140 disposed on the upper surface of the light guide plate 150 and a reflective sheet 160 disposed on the lower surface of the light guide plate 150 .

The plurality of optical sheets 140 may include a diffusion sheet 141 positioned on the upper surface of the light guide plate 150 and one or more prism sheets 143 positioned on the upper surface of the diffusion sheet 141. The optical sheets 140 may diffuse and condense the light provided through the upper surface of the light guide plate 150 and provide the light to the liquid crystal panel 110.

The reflective sheet 160 may be disposed at a lower portion of the light guide plate 150 and may reflect light traveling in a downward direction of the light guide plate 150 toward the upper direction, that is, toward the optical sheets 140.

The liquid crystal panel 110 and the backlight unit 130 described above can be received and fixed by the support main 170 and the bottom cover 200. [

The support main 170 may be formed in a rectangular frame shape and the sides of the support main 170 support the four corners of the liquid crystal panel 110 so that the liquid crystal panel 110 is spaced apart from the backlight unit 130 by a predetermined distance . ≪ / RTI > The bottom cover 200 is coupled to the support main 170 and can house the backlight unit 130 therein.

The liquid crystal display 100 of the present invention may further include a light shielding tape (not shown) positioned between the liquid crystal panel 110 and the backlight unit 130, though not shown in the drawing.

The light shielding tape can prevent the light emitted from the backlight unit 130 from leaking to the outside while fixing the liquid crystal panel 110 and the backlight unit 130 so as not to be separated from the support main 170. The light-shielding tape may be formed of a double-sided tape on both sides of which an adhesive is applied, and the whole may be made of black.

As described above, in the liquid crystal display device 100 according to the present invention, one side of the second flexible circuit board 190 for mounting the light source 180 is formed to extend to the wedge portion WG of the light guide plate 150, It is possible to prevent a light leakage phenomenon in which the light emitted from the light source 180 leaks to the outside through the wedge portion WG of the light guide plate 150 to prevent a deterioration of the image quality of the liquid crystal display device 100. [

While a number of embodiments have been described in detail above, it should be construed as being illustrative of preferred embodiments rather than limiting the scope of the invention. Therefore, the invention should not be construed as limited to the embodiments described, but should be determined by equivalents to the appended claims and the claims.

100: liquid crystal display device 110: liquid crystal panel
130: backlight unit 140: optical sheet
150: light guide plate 180: light source
190: second flexible circuit board

Claims (7)

A light source composed of one or more light emitting diodes;
A wedge-shaped light guide plate disposed adjacent to the light source and having an area adjacent to the light source that is thicker than the remaining area; And
And a flexible circuit board on which the light source is mounted and which is formed so that one side of the flexible circuit board overlaps an upper surface of the light source adjacent to the light source. The method according to claim 1,
The light guide plate includes a first region adjacent to the light source, a second region in the form of a plate having a thickness thinner than the thickness of the first region, and a second region connecting the first region and the second region, And a third region where the thickness becomes thinner toward the second region,
Wherein one side of the flexible circuit board extends from an upper surface of the first area of the light guide plate to an upper surface of the third area. 3. The method of claim 2,
Wherein a thickness of the first region of the light guide plate is equal to a height of the light emitting diode. The method according to claim 1,
Further comprising a plurality of optical sheets arranged on the upper surface of the light guide plate and composed of a diffusion sheet and at least one prism sheet,
Wherein at least one of the diffusion sheet and the prism sheet extends to cover one side of the flexible circuit board. The method according to claim 1,
Wherein the flexible printed circuit board includes a base film, a conductive layer formed on one side of the base film, and a coverlay layer formed on the conductive layer,
Wherein the cover layer is in contact with the upper surface of the light guide plate at one side of the flexible circuit board. 6. The method of claim 5,
Further comprising a plurality of optical sheets arranged on the upper surface of the light guide plate and composed of a diffusion sheet and at least one prism sheet,
Wherein at least one of the diffusion sheet and the prism sheet extends to cover one side of the flexible circuit board. A liquid crystal panel; And
And a backlight unit disposed below the liquid crystal panel and supplying light to the liquid crystal panel,
The backlight unit includes:
A light source composed of one or more light emitting diodes;
A wedge-shaped light guide plate disposed adjacent to the light source and having an area adjacent to the light source that is thicker than the remaining area; And
And a flexible printed circuit board on which the light source is mounted and which is formed so that one side of the flexible circuit board overlaps with an upper surface of the light source adjacent to the light source.
KR20130109302A 2013-09-11 2013-09-11 Backlight unit and liquid crystal display including the same KR20150030080A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108303829A (en) * 2018-04-19 2018-07-20 江西联创致光科技有限公司 A kind of flexible circuit board positive and negative of screen is staggered black light blocking body structure
CN111325102A (en) * 2020-01-21 2020-06-23 北京迈格威科技有限公司 Fingerprint subassembly of making a video recording under screen, fingerprint subassembly and mobile terminal under LCD screen
CN113721387A (en) * 2021-08-27 2021-11-30 京东方科技集团股份有限公司 Backlight module and display device
CN114442362A (en) * 2021-07-06 2022-05-06 荣耀终端有限公司 Display module and electronic device

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108303829A (en) * 2018-04-19 2018-07-20 江西联创致光科技有限公司 A kind of flexible circuit board positive and negative of screen is staggered black light blocking body structure
CN111325102A (en) * 2020-01-21 2020-06-23 北京迈格威科技有限公司 Fingerprint subassembly of making a video recording under screen, fingerprint subassembly and mobile terminal under LCD screen
CN111325102B (en) * 2020-01-21 2023-11-24 天津极豪科技有限公司 Fingerprint camera shooting component under screen, fingerprint component under LCD screen and mobile terminal
CN114442362A (en) * 2021-07-06 2022-05-06 荣耀终端有限公司 Display module and electronic device
CN114442362B (en) * 2021-07-06 2023-10-20 荣耀终端有限公司 Display assembly and electronic equipment
CN113721387A (en) * 2021-08-27 2021-11-30 京东方科技集团股份有限公司 Backlight module and display device
CN113721387B (en) * 2021-08-27 2023-10-27 京东方科技集团股份有限公司 Backlight module and display device

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