KR102015334B1 - Back Light Unit:BLU - Google Patents

Back Light Unit:BLU Download PDF

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Publication number
KR102015334B1
KR102015334B1 KR1020120128219A KR20120128219A KR102015334B1 KR 102015334 B1 KR102015334 B1 KR 102015334B1 KR 1020120128219 A KR1020120128219 A KR 1020120128219A KR 20120128219 A KR20120128219 A KR 20120128219A KR 102015334 B1 KR102015334 B1 KR 102015334B1
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KR
South Korea
Prior art keywords
support
reflective sheet
sheet
light
region
Prior art date
Application number
KR1020120128219A
Other languages
Korean (ko)
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KR20140061065A (en
Inventor
진미형
이민진
임주상
박민수
홍주혜
Original Assignee
엘지디스플레이 주식회사
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Application filed by 엘지디스플레이 주식회사 filed Critical 엘지디스플레이 주식회사
Priority to KR1020120128219A priority Critical patent/KR102015334B1/en
Publication of KR20140061065A publication Critical patent/KR20140061065A/en
Application granted granted Critical
Publication of KR102015334B1 publication Critical patent/KR102015334B1/en

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    • 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
    • G02B6/0055—Reflecting 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
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
    • G02B6/0031—Reflecting 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
    • G02B6/0081—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
    • G02B6/0088—Positioning aspects of the light guide or other optical sheets in the package
    • 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

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Planar Illumination Modules (AREA)

Abstract

The present invention eliminates the existing light guide plate and provides uniform luminance using a three-dimensional reflective sheet, and forms a pattern for diffuse reflection in a predetermined region of the reflective sheet so that light from the light source module is evenly reflected. . On the other hand, including a support and a support ring for fixing the reflective sheet is an invention for minimizing the generation of the dark portion caused by the lifting of the reflective sheet by the impact of the reflective sheet.

Description

Backlight Unit {Back Light Unit: BLU}

The present invention relates to a backlight unit.

Liquid crystal displays take up a large portion of both the small and large display markets. Liquid crystals are injected between two thin glass substrates to generate contrast by changing the arrangement of liquid crystal molecules when power is supplied. Device. Unlike the organic light-emitting display device and the like, since the liquid crystal display device is a non-emission type, it is necessary to use a backlight unit that is a back light source. The backlight unit serves to provide uniform light over the entire area of the liquid crystal panel. The backlight unit accounts for 20 to 50% of the total material cost of the liquid crystal display. Most of the light sources used in the backlight unit are made of a line or point light source, and it is necessary to convert these light into a surface light source to be directed to the liquid crystal panel. As mentioned above, the light guide plate is an important component of the liquid crystal display device to make a surface light source. However, since the light guide plate is expensive and occupies a lot of weight, it has become a problem from the viewpoint of reducing the manufacturing cost of the liquid crystal display and portability of the liquid crystal display.

The present invention provides a backlight unit without a light guide plate.

The present invention provides a backlight unit with uniform brightness.

The backlight unit according to the present invention includes.

The present invention eliminates the existing light guide plate and forms a pattern for diffuse reflection in a predetermined region of the reflective sheet having a three-dimensional shape so that light from the light source is evenly reflected to obtain uniform luminance. In addition, including a support and a support ring for fixing the reflective sheet can minimize the occurrence of the dark portion due to the occurrence of the lifting of the reflective sheet by the impact.

1 is a plan view of a backlight unit according to the present invention;
2 is a plan view of a bottom cover according to the present invention;
3 is a perspective view of a bottom cover and a reflective sheet according to the present invention;
4 is a cross-sectional view of the backlight unit according to the first embodiment of the present invention.
5 is a cross-sectional view of the reflective sheet of FIG.
6 is a cross-sectional view of the backlight unit according to the second embodiment of the present invention.
7a and 7b is a photograph of the measurement of luminance according to whether the pattern is formed
8 is a perspective view of the reflective sheet of FIG.
9 is an experimental photograph of measuring the luminance when the ratio of the pattern is different
10 is a cross-sectional view of the backlight unit according to the third embodiment of the present invention.
11 is a perspective view of the support ring coupled to the support and the support of FIG.
12 is a perspective view of the support coupled to the reflective sheet of FIG.
13 is a cross-sectional view of a backlight unit as a fourth embodiment of the present invention.
14 is a perspective view of the support of FIG. 13
Figure 15 is a photograph of the dark measurement measurement according to whether the second support ring is coupled

1 is a plan view of a backlight unit.

Referring to FIG. 1, the backlight unit 10 according to the present invention may include a bottom cover 1, a reflective sheet 2, a diffusion sheet 3, and a light source module 4. The reflective sheet 2, the diffusion sheet 3, and the light source module 4 may be accommodated in the bottom cover 1. The reflective sheet 2 may be accommodated in the bottom cover 1 and reflect light emitted from the light source module 4. The diffusion sheet 3 may be disposed on the reflective sheet 2 to diffuse light reflected from the reflective sheet 2.

2 is a plan view of the bottom cover.

2, in the backlight unit 10 of the present invention, at least one protrusion 11 may be formed in a peripheral region of the bottom cover 1. The protrusion 11 may be a triangle, a polygon such as a rectangle, a circle, an oval, and the like, but is not limited thereto. At least one light source module 4 may be disposed at one side of the bottom cover 1.

The protrusion 11 may extend in an upward direction from an upper surface of the bottom cover 1.

The protrusion 11 may be formed of the same material or different materials as the bottom cover 1, but is not limited thereto.

For example, at least one light source module 4 may be formed on the first side of the bottom cover 1, and at least one protrusion 11 is formed on the second to fourth sides of the bottom cover 1. It may be, but not limited to this.

The first side and the third side may be areas facing each other, and the second side and the fourth side may be areas facing each other.

For example, the peripheral area of the bottom cover 1 may be defined in the order of the first side, the second side, the third side, and the fourth side along the clockwise direction, but is not limited thereto.

3 is a perspective view of a bottom cover and a reflective sheet.

Referring to FIG. 3, in the backlight unit 10 of the present invention, a reflective sheet 2 having a three-dimensional shape and an edge of the reflective sheet 2 are bent to form at least one hole 21 in the edge. Can be. The hole 21 is formed at a position corresponding to the protrusion 11 of the bottom cover 1, and when the reflective sheet 2 is accommodated in the bottom cover 1, the hole 21 is the protrusion ( 11, the reflective sheet 2 may be fixed to the bottom cover 1.

4 is a cross-sectional view of a backlight unit as a first embodiment according to the present invention.

Referring to FIG. 4, a light source module 4 is disposed at one side of the bottom cover 1 of the backlight unit 10 of the present invention, starting at the end of the light source module 4, and at one side of the bottom cover 1. The reflective sheet 2 fixed to the upper protrusion 11 is disposed inside the bottom cover 1 while having a three-dimensional shape. The light guide plate included in the existing backlight unit may be deleted and a surface light source may be made using the reflective sheet 2 in place of the light guide plate.

The bottom cover 1 has a flat bottom surface 1a, a partition wall 1b formed by bending upward from the bottom surface 1a, and an upper portion of one side of the partition wall 1b toward the diffusion sheet 3 side. It may include an extension portion 1c that is formed to extend, but is not limited thereto.

The light source module 4 may be fixed to the rear surface of the extension part 1c. In the light source module 4, the light may travel in at least a downward direction, a diagonal direction, or a lateral direction, but is not limited thereto.

The reflective sheet 2 may be disposed to face the traveling direction of the light of the light source module 4, but the embodiment is not limited thereto.

The reflective sheet 2 may include a light guide region 100 and a light reflection region 101. The curvature of the light guide region 100 and the curvature of the light reflection region 101 may be different. For example, the curvature of the light guide region 100 may be equal to or larger than the curvature of the light reflection region 101, but is not limited thereto.

The reflective sheet 2 may have an asymmetrical shape with respect to the normal line 26 at the lowest point of the reflective seat 2, but is not limited thereto.

The light guide member 22 may be attached to an upper surface of the light guide region 100 facing the light source module 4. The light guide member 22 may supply light to the light reflecting region 101 by reflecting light emitted from the light source module 4 in a regular reflection (light incident on the surface is reflected evenly in a single opposite direction). . The light reflection area 101 may serve to diffuse the light supplied from the light guide area 100 to the diffusion sheet 3 by reflecting the reflections (the reflected light is reflected in various directions). The light guide member 22 may be attached to an area of the reflective sheet 2 facing the light source module 4, but is not limited thereto.

5 is a cross-sectional view of the reflective sheet.

Referring to FIG. 5, the light guide member 22 may be attached to the light guide region 100 of the reflective sheet 2. The light guide member 22 may include a first sheet 23 and a second sheet 24. The first sheet 23 may be coated on the second sheet 24. The first sheet 23 is, for example, a single layer or a multilayer including at least one selected from the group consisting of Ag, Ni, Al, Rh, Pd, Ir, Ru, Mg, Zn, Pt, Au and Hf. It may include, but is not limited thereto. The second sheet 24 may be formed of a plastic material such as polyethylene terephthalate (PET), but is not limited thereto. The light guide member 22 may be attached to the reflective sheet 2 by an adhesive.

6 is a cross-sectional view of a backlight unit as a second embodiment of the present invention.

Referring to FIG. 6, a diffuse reflection feature may be added to the light guide member 22 of the backlight unit 10 of the present invention for uniform brightness. At least one pattern (Pattern) is applied to the front surface of the light guide member 22 to impart diffuse reflection to the front surface of the light guide member 22 due to roughness and curvature or the like, or is disposed on the light guide region 100 of the reflective sheet 2. (5) can be formed. The pattern 5 may solve the luminance imbalance by inducing diffuse reflection of light emitted from the light source module 4. The scattering degree can be adjusted in consideration of the size and density of the pattern (5).

7A is a photograph of brightness measurement experiment when no pattern is formed, and FIG. 7B is a photograph of brightness measurement experiment when a pattern is formed. FIG. 7C is a graph illustrating luminance differences between the light incident part and the light incident part (the area where the light source module is present) when the pattern is formed and when the pattern is not formed.

Referring to FIGS. 7A and 7B, luminance measurement experiments were performed by comparing a case in which a pattern is not formed with a light guide member made of silver AG. Comparing them, it can be seen that when the pattern is formed, the color difference is reduced between the light guide region 100 and the light reflection region 101 so that the luminance is more uniform than the case where the pattern is not formed.

Meanwhile, referring to FIG. 7C, the luminance difference between the light incident portion and the light incident portion in the case where the pattern is not formed on the light guide member made of silver (AG / Ref.) And when the pattern is formed (Pattern) is relatively When the pattern is formed, it can be seen that the luminance of the light incident portion and the light incident portion is more evenly represented.

8 is a perspective view of a reflective sheet.

Referring to FIG. 8, the reflective sheet 2 may include a light guide region 100 and a light reflection region 101. The light guide member 22 may be attached to the light guide region 100. A plurality of patterns 5 may be formed on the light guide member 22, but is not limited thereto. The pattern 5 may be a dot pattern in the form of a dot or a bar pattern in the form of a bar, but is not limited thereto.

The pattern 5 may be formed integrally with the light guide member 22 or may be formed separately from the light guide member 22, but is not limited thereto. In the case of the dot pattern, when viewed from above or viewed from the side, it may be in the form of a semi-circle, a triangle and a square, but is not limited thereto. In addition, the bar pattern may be rectangular, semi-cylindrical, or the like when viewed from above or viewed from the side, but is not limited thereto.

In addition, the light guide member 22 may include a first region 102 adjacent to the light reflection region 101 and a second region 103 adjacent to the first region 102.

The pattern 5 may be formed in the first region 102. Accordingly, the second region 103 may perform specular reflection and the first region 102 may perform diffuse reflection by the pattern 5. By preventing the pattern 5 from being formed in the second region 103, it is possible to prevent the luminance of the light guide region 100 from being too high. The width of the second region 103 may be 20 to 50 mm, but is not limited thereto.

9 is an experimental photograph of measuring luminance when the ratio of the pattern is different.

Referring to FIG. 9, the pattern 5 on the first region 102 may be formed to occupy a predetermined area as compared to the entire region of the light guide member 22. When the first sheet 23 included in the light guide member 22 is made of silver AG, and the pattern 5 is formed on the upper surface of the first sheet 23 and the pattern 5 is not formed. At the same time, the experiment was performed to measure the luminance while varying the ratio of the pattern 5 to the entire area of the first sheet 23. When the proportion of the pattern 5 becomes 7.5%, the difference in luminance is not large compared to the case in which the pattern 5 is not formed (AG / Ref.), And the proportion of the pattern 5 accounts for 60%. When the percentage is high, the luminance of the light incident part is increased too much. The pattern 5 may be formed to occupy an area of 10 to 50% of the entire area of the first sheet 23 to be uniform in brightness, but is not limited thereto.

The material forming the pattern 5 may be composed of acryl-based resin, carbitol solvent, silicon dioxide (SIO 2) diffusion agent, and the like, but is not limited thereto.

As a method of printing the pattern 5 on the first sheet 23, there is a first screen printing method. In this method, a printing plate having a pattern 5 shape hole is formed on the top of the first sheet 23 on the top of the first sheet 23, the ink is sprayed on the top of the plate and the entire plate is squeezed through a squeeze process. Scratches. In addition, the hole punched area of the plate is printed on the first sheet 23 while the ink is removed, and the desired pattern 5 is placed at a desired position of the first sheet 23 so that the hole is not printed. Allow printing in shape.

In the second inkjet printing method, ink is filled in the nozzle of the injector, and the nozzle is moved to print ink by spraying a predetermined pressure at a desired position of the first sheet 23 while moving. The printing method is only an example of forming the pattern 5 and is not limited to the above method.

Meanwhile, in place of the pattern 5, an unstretched polypropylene (CPP) film and

Oriented polypropylene film (OPP) film or the like attached to the first sheet 23, through which diffuse reflection can be induced, but is not limited thereto.

10 is a cross-sectional view of a backlight unit as a third embodiment of the present invention.

Referring to FIG. 10, the backlight unit 10 according to the present invention includes a bottom cover 1, a reflective sheet 2, a diffusion sheet 3, a light source module 4, at least one support 6, and at least one. The support ring 7 may be included. The support 6 may support the diffusion sheet 3, and the support ring 7 may support the reflective sheet 2.

Meanwhile, a light guide member (not shown) may be attached to an area of the reflective sheet 2 facing the light source module 4.

11 is a perspective view of the support and the support ring coupled to the support.

Referring to FIG. 11, the support ring 7 may be circular, triangular, square, rhombus, and a circular shape having two heads, but is not limited thereto. Meanwhile, the support ring 7 may be formed integrally with the support 6, but is not limited thereto.

The support 6 may be formed in a cylindrical shape and narrow in the upper direction, and may have a shape narrowing from the lower part to the upper part. In this case, when the support ring 7 is fitted to the support 6, the support ring 7 is fixed to the support 6 at a point where the thickness of the support becomes larger than the hole of the support ring 7. In addition, a groove 61 may be formed on the surface of the support 6. In this case, the support ring 7 is fitted into the groove 61 and the support ring 7 can fix the reflective sheet 2 without being separated from the support 6.

The support 6 may be made of a plastic material, but is not limited thereto. The support ring 7 may be made of a rubber material having elasticity, but is not limited thereto. The support ring 7 may be made of the same material as the support 6, and in this case, the support ring 7 And the support 6 may be integrally formed, but is not limited thereto.

12 is a perspective view of the support is coupled to the reflective sheet.

Referring to FIG. 12, at least one support fitting hole 25 may be formed in the reflective sheet 2. The support 6 penetrates the support fitting hole 25 so that the support 6 is fitted to the reflective sheet 2. The support ring 7 may be disposed at a position corresponding to the support fitting hole 25 on the rear surface of the reflective sheet 2 to support the reflective sheet 2. The arrangement of the support 6 may vary depending on the brightness and the size of the reflective sheet 2. The reflective sheet 2 and the diffusion sheet (not shown) of the backlight unit 10 are stably fixed by using the support 6 and the support ring 7.

13 is a cross-sectional view of a backlight unit as a fourth embodiment of the present invention.

Referring to FIG. 13, the backlight unit 10 according to the present invention may further include at least one second support ring 8. The second support ring 8 may be fitted to the support 6 to fix the reflective sheet 2 together with the first support ring 7 to prevent the reflective sheet 2 from being separated from an external impact. The second support ring 8 may be in the shape of a circle, square, triangle, rhombus, etc., but is not limited thereto.

The material of the second support ring 8 may be rubber, but is not limited thereto. When the material of the second support ring 8 is a rubber system, specific materials of the rubber system include silicon, viton, and EPDM, and NBR (acrylonitrile-butadiene rubber: NBR). ), Etc., but is not limited thereto. The second support ring 8 may be made of an elastic material such as rubber. In this case, when there is an impact on the backlight unit 10, an impact may be transmitted to the reflective sheet 2 so that the reflective sheet 2 may flow. In this case, the impact of the reflective sheet 2 is absorbed by the elastic force of the second support ring 8, thereby minimizing the flow of the reflective sheet 2. In addition, when the second support ring 8 has an elastic material, the second support ring 8 can be easily assembled with the support 6. In addition, rubber is a cheap material and does not require a large manufacturing cost. In addition, since the support ring 8 is made of rubber, scratches may be minimized on the surface of the reflective sheet 2 while fixing the reflective sheet 2. Meanwhile, the second support ring 8 may be made of transparent rubber, but is not limited thereto. When the second support ring 8 is made of transparent rubber, the second support ring 8 may serve to reflect light in the reflection sheet 2 and minimize the occurrence of a dark portion according to the second support ring 8. .

Meanwhile, only the second support ring 8 is coupled to the support 6 so that the second support ring 8 may fix the reflective sheet 2 on the upper surface of the reflective sheet 2, but is not limited thereto. no.

14 is a perspective view of the support.

Referring to FIG. 14, a groove 61 may be formed in the support 6 in order to prevent the second support ring 8 from being fitted to the support 6. The second support ring 8 may be inserted into the groove 61 of the support 6 to prevent separation, and may fix the reflective sheet 2 more firmly, but is not limited thereto. On the other hand, the groove 61 is also formed in the region where the first support ring 7 and the second support ring 8 are fitted in the support 6 so that the first support ring 7 and the second support ring ( 8) may be fixed to the support 6, respectively, but is not limited thereto.

On the other hand, the support ring 8 is formed on the one side facing the diffusion sheet (not shown), that is, the upper surface of the support ring 8, the coating layer 9 of the same material as the material of the reflective sheet 2 is formed Can be. The coating layer 9 may serve to reflect light in the reflective sheet 2 to minimize darkening.

15 is a photograph of dark measurement experiment according to whether the second support ring is coupled.

Referring to FIG. 15, the impact test of the backlight unit 10 is performed when the second support ring 8 is not included in the backlight unit 10 and when the second support ring 8 is included. When the second support ring 8 is not included, it can be confirmed that the dark part is generated in the light incident part (the area opposite to the area where the light source module is located) due to the lifting or separation of the reflective sheet 2. have. However, when the second support ring 8 is included to fix the reflective sheet 2, no lifting or spacing of the reflective sheet 2 occurs even when the impact test of the backlight unit 10 does not generate a dark portion. You can check that it does not.

Meanwhile, the direct type backlight unit 10 may also include a support for supporting the diffusion sheet. In order to prevent the flow of the reflective sheet disposed below the support, a support ring may be fitted to the support to fix the reflective sheet.

In the detailed description of the present invention described above with reference to the preferred embodiment of the present invention, those skilled in the art or those skilled in the art having ordinary knowledge of the present invention described in the claims to be described later It will be understood that various modifications and variations can be made in the present invention without departing from the spirit and scope of the art. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims.

1. Bottom cover
1a. Bottom of bottom cover
1b. Bottom wall
1c. Bottom cover extension
2. Reflective sheet
3. Diffusion Sheet
4.light source module
5.pattern
6.support
7.First support ring
8.second support ring
9.coating layer
10. Backlight Unit
11.protrusion
21.Hall
22. Light guide member
23. First sheet
24. Second sheet
25. Support insertion hole
26. Normal Line
61. Home
100. Light guide area
101. Light reflection area
102. First area
103. Second area

Claims (10)

Light source;
A reflective sheet reflecting light of the light source;
A diffusion sheet for diffusing light reflected from the reflection sheet;
A bottom cover to accommodate the light source, the reflection sheet, and the diffusion sheet;
A support extending from a bottom surface of the bottom cover to support the diffusion sheet and penetrating the reflective sheet; And
A pair of support rings coupled to the support with the reflective sheet therebetween,
The reflective sheet has a three-dimensional shape,
The reflective sheet includes a light guide region and a light reflection region,
The light guide region specularly reflects light from the light source and supplies the light guide region to the light reflection region,
The light reflection region diffuses the light supplied from the light guide region,
And the reflective sheet is spaced apart from the bottom surface of the bottom cover by the support and the pair of support rings. The method of claim 1,
And a light guide member disposed on the light guide region. The method of claim 2,
The light guide member further includes a first sheet and a second sheet coated with the first sheet. The method according to claim 1 or 2,
The light guide region,
A first region adjacent the light reflecting region;
A second region adjacent to the first region,
A backlight unit comprising a plurality of patterns disposed in the first area. The method of claim 4, wherein
The pattern unit is a backlight unit is formed in the range of 10 to 50% of the light guide region. delete The method of claim 1,
The pair of support rings includes a first support ring disposed on a rear surface of the reflective sheet and coupled to the support to support the reflective sheet on the rear surface. The method of claim 7, wherein
And the support and the first support ring are integrally formed. The method of claim 7,
The pair of support rings further include a second support ring disposed on an upper surface of the reflective sheet and coupled to the support. The method of claim 9,
The second support ring,
The backlight unit is formed with a coating layer made of the same material as the reflective sheet on one side facing the diffusion sheet.
KR1020120128219A 2012-11-13 2012-11-13 Back Light Unit:BLU KR102015334B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020120128219A KR102015334B1 (en) 2012-11-13 2012-11-13 Back Light Unit:BLU

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020120128219A KR102015334B1 (en) 2012-11-13 2012-11-13 Back Light Unit:BLU

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KR20140061065A KR20140061065A (en) 2014-05-21
KR102015334B1 true KR102015334B1 (en) 2019-08-28

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Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101659972B1 (en) * 2014-07-15 2016-09-27 희성전자 주식회사 Backlight unit of Reverse Lighting type

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009158193A (en) * 2007-12-25 2009-07-16 Sony Corp Backlight device and liquid crystal display device
JP2012221941A (en) * 2011-04-04 2012-11-12 Lg Innotek Co Ltd Backlight unit and display device using the same

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100852173B1 (en) * 2002-05-23 2008-08-13 삼성전자주식회사 Direct type liquid crystal display
KR20090108409A (en) * 2008-04-11 2009-10-15 엘지디스플레이 주식회사 Liquid Crystal Display Device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009158193A (en) * 2007-12-25 2009-07-16 Sony Corp Backlight device and liquid crystal display device
JP2012221941A (en) * 2011-04-04 2012-11-12 Lg Innotek Co Ltd Backlight unit and display device using the same

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