KR20130133569A - Back light unit and liquid crystal display comprising the same - Google Patents

Back light unit and liquid crystal display comprising the same Download PDF

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Publication number
KR20130133569A
KR20130133569A KR1020120056930A KR20120056930A KR20130133569A KR 20130133569 A KR20130133569 A KR 20130133569A KR 1020120056930 A KR1020120056930 A KR 1020120056930A KR 20120056930 A KR20120056930 A KR 20120056930A KR 20130133569 A KR20130133569 A KR 20130133569A
Authority
KR
South Korea
Prior art keywords
surface portion
light
light guide
backlight unit
guide plate
Prior art date
Application number
KR1020120056930A
Other languages
Korean (ko)
Inventor
카리루 카란타루
박영우
주영현
이은곤
최승만
Original Assignee
제일모직주식회사
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 제일모직주식회사 filed Critical 제일모직주식회사
Priority to KR1020120056930A priority Critical patent/KR20130133569A/en
Publication of KR20130133569A publication Critical patent/KR20130133569A/en

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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
    • G02B6/0013—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
    • G02B6/003—Lens or lenticular 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
    • G02B6/0035—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
    • G02B6/0038—Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the 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
    • G02B6/0055—Reflecting element, sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/04—Prisms
    • G02B5/045—Prism arrays
    • 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)
  • Planar Illumination Modules (AREA)

Abstract

The present invention relates to a backlight unit and a liquid crystal display including the same. More specifically, the present invention relates to a backlight unit including a light guide plate on which an optical deflection portion and an optical deflection element are formed, and a light guide on which an uneven portion is formed. In the backlight unit of the present invention, the total reflection and the degree of refraction of the light emitted from the light source can be adjusted by adjusting the shape of the light deflection portion, the light deflection element, or the uneven portion.

Description

Back light unit and liquid crystal display comprising the same

The present invention relates to a backlight unit and a liquid crystal display including the same. More specifically, the present invention relates to a backlight unit including a light guide plate on which an optical deflection portion and an optical deflection element are formed, a light guide on which an uneven portion and a convex portion are formed, and a liquid crystal display including the same. The present invention can adjust the total reflection and the degree of refraction of the light emitted from the light source, it is possible to increase the brightness.

The backlight unit is a light emitting device included in a display element such as a liquid crystal display device. Such a backlight unit may be largely divided into an edge method and a direct method. The edge type backlight unit is mainly included in a small display element applied to a computer monitor and the like, and the direct type backlight unit is included in a large display element applied to an LCD TV and the like.

In the backlight unit, a light source is formed on the side of the light guide plate to draw light from the side portion to the light guide plate, or a part of the side portion is inserted to insert the light source into the light guide body. In such a structure, there has been a problem in controlling the efficiency of light because light from a light source is incident only on the light guide. In addition, elements that may affect reflection or refraction of light have been formed in the back and surface portions of the light guide. However, this method also has a limitation in adjusting the efficiency of light or increasing the brightness.

Related prior arts include Korean Patent No. 10-0793538 (name of the light guide plate).

An object of the present invention is to provide a backlight unit that can adjust the efficiency of light.

Another object of the present invention is to provide a backlight unit capable of increasing or decreasing the efficiency of light.

Still another object of the present invention is to provide a backlight unit capable of increasing or decreasing luminance and making the emission angle small or large.

Another object of the present invention is to provide a liquid crystal display device including the backlight unit.

In one aspect, the backlight unit includes a light guide plate; And a rear surface portion formed on the light guide plate, into which the light emitted from the surface portion of the light guide plate enters, a surface portion which emits the light to the outside, and a side portion which connects the rear surface portion and the surface portion. A plurality of prisms that are triangular convex portions are formed, and the surface portion may include a light guide member having a plurality of prisms that are arc-shaped irregularities in cross section.

A liquid crystal display device according to another aspect of the present invention may include the backlight unit.

The present invention provides a backlight unit that can adjust the efficiency of light. In addition, the present invention provides a backlight unit capable of increasing luminance.

1 illustrates an embodiment of a backlight unit of the present invention.
Figure 2 shows an embodiment of the light guide plate of the present invention.
Figure 3 shows an embodiment of the light guide of the present invention.
4 is an enlarged cross section of the light guide of the present invention.
5A and 5B show the positional relationship between the bottom and the apex or the bottom and the bottom in a triangular convex prism and an arcuate uneven prism.
6 shows one embodiment of a partial schematic view of a light guide of the invention.
7 shows an embodiment of a cross-sectional view of the light guide of the present invention.

A backlight unit according to an aspect of the present invention may include a light guide plate and a light guide member, and a light guide body may be formed on the light guide plate.

Hereinafter, the present invention will be described in more detail with reference to FIGS. 1 to 7.

FIG. 1 shows a specific example of the backlight unit of the present invention, and FIGS. 2 and 3 show specific examples of the light guide plate and the light guide of the present invention, respectively.

According to FIG. 1, the backlight unit of the present invention may include a light guide plate 10 and a light guide 1. The light guide is formed on the upper part of the light guide plate. The light deflecting part, the light deflecting element, the uneven part, and the convex part, which may affect the refraction or reflection of the light incident from the light source, are respectively formed on the light guide plate and the light guide body, so that the light reflection efficiency can be adjusted. In particular, by adjusting the light deflecting portion of the light guide plate and the shape of the light deflecting element, the emission angle and the emission angle of the light emitted from the surface portion of the light guide plate are adjusted by controlling the total reflection or refraction of the light incident from the light source 20 installed in the transverse direction of the light guide plate. The radiation light cone can be adjusted.

The light guide plate and the light guide will be described in more detail below.

The light source 20 is formed on the side of the light guide plate so that light from the light source may be incident on the light guide plate and then emitted through the light guide. The light source can be a pseudo white, red, green or blue light emitting semiconductor light emitting element, a discharge type element, for example, indirect illumination, direct illumination, cold cathode fluorescent discharge tube (CCFL), or an array thereof, which is a semiconductor object. It is not limited to these.

The reflector 21 may be formed under the light guide plate. The reflecting plate is formed under the light guide plate, thereby reflecting the missing light from the light source or the rear surface of the light guide plate and allowing the light to enter the light guide plate, thereby increasing the light efficiency. The reflecting plate may be formed of a sheet containing a white material such as titanium oxide in a thermoplastic resin, a metal or metal foil such as aluminum laminated on a sheet of thermoplastic resin, or a metal on a sheet.

The diffusion plate 22 may be formed on the light guide. The diffusion plate may be formed of an acrylic resin such as a light guide, polycarbonate, polyethylene terephthalate, polyethylene naphthalate, polyether sulfone, or the like.

The backlight unit of the present invention may include a case 23 for accommodating the light guide plate, the light guide body, the reflecting plate, and the diffusion plate into one device.

In the backlight unit, the uneven portion and the convex portion are formed in the front portion and the rear portion of the light guide body, respectively. Light propagated from the surface portion of the light guide plate is incident on the rear surface portion of the light guide body. The incident light is deflected on one inclined surface constituting the uneven portion formed on the rear surface portion of the light guide body, totally reflected on the other inclined surface opposite to the surface portion, and then deflected to the surface portion to proceed to light having a small emission angle. The light reaching the surface portion of the light guide may adjust the emission angle and the emission angle of the light emitted by being refracted by the convex portion formed on the surface portion.

As an example, the light emitted from the light source in the transverse direction of the light guide plate is emitted as light having a large emission angle and a small emission angle while passing through the light guide plate. The emitted light may be emitted as light having a small emission angle and a large emission angle while passing through the light guide.

Figure 2 shows an embodiment of the light guide plate of the present invention.

The light guide plate 10 connects the incident end surface portion 13 to which light enters from a light source (not shown), a reflective end surface portion 14 located on the opposite side of the incident end surface portion, and connects the incident end surface portion and the reflective end surface portion to the incident end surface. It may include a surface portion 12 for emitting the light coming from the portion, a rear portion 11 located on the opposite side of the surface portion, and a side portion 15 connecting the surface portion and the rear surface portion.

An optical deflecting portion 16 is formed at the rear surface portion of the light guide plate to reflect the light from the incident end portion to the surface portion. The optical deflection portion may be formed in plural in a direction perpendicular to the incident end surface portion. The light deflecting portion may be arranged in a straight line, curved shape or any shape on the back surface portion of the light guide plate. The light deflecting units may be arranged in a direction perpendicular to the direction in which the light source is incident.

The shape of the light deflection portion is not particularly limited, but may be a part of a spherical shape, a part of an elliptic sphere shape, a triangular pyramid shape, a cone shape, a square pyramid shape, a triangular prism shape, a square pillar shape, a cylindrical shape, or the like. Preferably, the light deflection portion may have a triangular shape having an asymmetric cross section. The light deflecting portion may be formed of an inclined surface portion 16a facing the incident end surface portion and an inclined surface portion 16b facing the reflective cross section direction when the cross section has an asymmetrical triangular shape. The length of the inclined surface portion opposite the direction of the reflective cross section may be 10-500 μm. Within this range, it is possible to have the effect of improving the efficiency and the effect of the prism microin.

When the optical deflection portion has a triangular cross section, the pitch of the optical deflection portion may be 0.001-0.500 mm, preferably 0.01 to 0.1 mm.

The vertex angle formed by the inclined surface portion opposite to the inclined surface portion constituting the triangular shape as the optical deflection portion may be 80 to 175 °, and the angle between the inclined surface portion 16a and the light guide plate opposite to the incident end surface direction is 0.1-10 °. And the angle between the inclined surface portion and the light guide plate opposite the direction of the reflective cross section may be 0.1-90 °.

The light deflecting element 17 which emits light from the back part of the light guide plate is formed in the surface part of the light guide plate. The optical deflecting element may be formed in plural in a direction perpendicular to the incident end portion. The optical deflecting element may be arranged in a straight line, curved line or any shape on the surface portion of the light guide plate. The light deflecting elements may be arranged in a direction horizontal to the direction in which the light source is incident (the direction coinciding with the direction in which the light source is incident).

The shape of the optical deflecting element is not particularly limited, but may be a part of a spherical shape, a part of an elliptic spherical shape, a triangular pyramid shape, a cone shape, a square pyramid shape, a triangular prism shape, a square pillar shape, a cylindrical shape, or the like. Preferably, the optical deflecting element may have a lenticular shape.

In the lenticular optical deflecting element, the pitch may be 5 μm-100 μm and the radius of curvature may be 1 μm-320 μm. Within this range, it can have the effect of a widening angle. Preferably, the pitch may be 10 占 퐉 to 50 占 퐉, and the radius of curvature may be 1 占 퐉 to 50 占 퐉.

A lens unit 18 for condensing light from the light source to the light guide plate may be formed at the incident end portion of the light guide plate. The lens portion may have a pitch of 0.001 mm-0.100 mm and a radius of curvature of 0.0005 mm-5 mm. Within this range, the incident light angle magnification effect can be achieved in the light guide panel (LGP).

Figure 3 shows an embodiment of the light guide of the present invention.

The light guide 1 has a back surface portion 2 through which light emitted from the surface portion of the light guide plate enters, a surface portion 3 for emitting the light to the outside, and side portions 4 and 5 connecting the back surface portion and the surface portion. It may include.

A plurality of prisms having triangular convex portions 6 and 7 may be formed on the rear surface of the light guide, and a plurality of prisms may be formed on the surface portion of the concavo-convex portion 8 having a circular cross section. . The arrangement direction of the convex prism and the concave-convex prism may be the same or different. For example, the prism of the convex portion formed on the rear surface portion of the light guide and the prism of the uneven portion formed on the surface portion may be the same.

The prism of the convex portion and the prism of the uneven portion may be formed in a direction perpendicular to the direction in which the light source is incident.

The light emitted from the surface portion of the light guide plate may pass through the convex portion formed on the rear surface portion of the light guide and the uneven portion formed on the surface portion, and thus the emission angle and the radiation angle may be adjusted.

For example, light having a large emission angle and a small emission angle emitted from the surface portion of the light guide plate is deflected and deflected on one inclined surface of the convex portion having a triangular cross section formed on the back surface portion of the light guide body, and totally reflected on another opposite inclined surface. It deflects toward the surface portion and proceeds to light having a small exit angle. The light that reaches the surface portion of the light guide may be refracted at the arcuate portion whose cross section is formed in the surface portion to be emitted as light having a large radiation angle. Therefore, the light emitted from the light source can be efficiently emitted to the light guide plate so that light having a large emission angle and small emission angle can be deflected to the light guide body in the vertical direction to emit light having a small emission angle and a small emission angle.

The emission angle and the radiation angle can be adjusted by adjusting the pitch and the inner angle of the prism having the triangular convex sections formed on the surface portion of the light guide. Further, the emission angle and the radiation angle can be adjusted by adjusting the pitch and the radius of curvature of the prism having the arc-shaped uneven portion formed in the rear surface of the light guide.

The thickness of the light guide may be 1-200 μm, preferably 50-100 μm.

4 illustrates an embodiment of a cross section of the light guide.

As shown in FIG. 4, the convex portion 6 having a triangular cross section formed on the rear surface portion 2 of the light guide is formed of two inclined surfaces 6a and 6b. From the apex part 7a where the two inclined surfaces 6a and 6b of the convex part meet, From the next apex part 7a 'or the bottom part 7b which the inclined surface 6a and the next inclined surface 6b meet. The distance to the next low point portion 7b ', that is, the pitch P2 of the convex portion prism may be 10-35 μm. The inner angle θ of the convex prism may be 40-75 °.

Moreover, from the top part 8a where two circular arcs of the uneven | corrugated part which the cross section formed in the surface part of the light guide body meets is from the next part 8a 'or the bottom part 8b of the arc to the next bottom part 8b'. The pitch P1 of the concave-convex portion prism having a circular arc shape and a distance and cross section may be 15-50 μm. The radius of curvature of the arc-shaped uneven portion prism may be 7-60 μm. When the radius of curvature becomes large, the light condensed on the light guide plate appears on the prism, but when the radius of curvature becomes small, the outgoing angle is widened perpendicular to the groove array of the prism. Side lobes occur due to widening of the exit angle (close to BEF characteristics), the light of the center lobe is shifted to the side lobe and the width of the center lobe becomes narrow. As a result, the luminance is reduced but a wide emission angle can be secured.

In the light guide, the convex prism having a triangular cross section and the concave-convex prism having a circular cross section may be formed obliquely in the same direction, in the cross direction, or at an angle.

5A illustrates an embodiment in which the prism of the convex portion and the uneven portion of the prism of the light guide are formed in the same direction. As shown in FIG. 5A, the arc-shaped concave-convex portion 8 of the front surface portion 3 and the triangular-shaped convex portion 6 of the back surface portion 2 are formed in the same direction and arc-shaped concave-convex portions are formed. The bottom portion 8b of the portion 8 and the apex portion 7a of the triangular convex portion 6 may have a positional relationship orthogonal to the light guide 1. As a result, the light can be refracted at the inclined surface of the triangular convex portion, slightly deflected, then cause total reflection at the opposite inclined surface, and deflect to the surface portion, so that most of the light reaches the arc-shaped uneven portion of the surface portion and can be emitted at a large exit angle. . From this, it is possible to obtain outgoing light having a uniform and wide emission angle.

5B illustrates another embodiment in which the prism of the convex portion and the uneven portion of the prism of the light guide are formed in the same direction. As shown in FIG. 5B, an arc-shaped concave-convex portion and a triangular convex portion are formed in the same direction, and at the same time, a bottom of the bottom portion 8b of the arc-shaped concave-convex portion 8 and the triangular convex portion 6 are formed. The portion 7b may have a positional relationship orthogonal to the light guide 1. As a result, the emitted light of uniform and wide viewing angle can be obtained.

6 illustrates an embodiment in which the prism of the convex portion and the uneven portion of the prism are formed obliquely in the light guide. As shown in FIG. 6, the arrangement direction of the arc-shaped uneven portion prism may be formed at an inclination α of 1 to 15 ° with respect to the arrangement direction of the triangular convex portion prism. As a result, generation | occurrence | production of the moire by a triangular vertex part, a bottom part, and an arc-shaped uneven part can be prevented.

The heights of the triangular convex prisms formed on the rear surface of the light guide may be the same or different.

In addition, since the vertex portion of the convex prism of the light guide is not on one straight line, the line connecting the vertex portion may be curved. As shown in FIG. 7, the distance between the virtual reference dotted line B of the vertex portion and the rear portion of the convex prism 6 is different from each other, so that the entire rear surface portion may form a wave shape. As a result, occurrence of moire can be prevented.

The light guide may be formed of a colorless transparent acrylic resin having a refractive index of 1.4-1.7, in particular polymethyl methacrylate, polycarbonate, polyethylene terephthalate, polyethylene naphthalate, polyether sulfone, but is not limited thereto.

Although the brightness of the backlight unit of the present invention decreases the luminance by increasing the emission angle, the backlight unit has high luminance and light energy through condensing on the light guide plate, so that the luminance of the backlight unit may be somewhat higher than that of the two orthogonal prisms.

A liquid crystal display device according to another aspect of the present invention may include the backlight unit. A method of manufacturing a liquid crystal display including the backlight unit may use a conventional method known to those skilled in the art.

Hereinafter, the configuration and operation of the present invention through the preferred embodiment of the present invention will be described in more detail. It is to be understood, however, that the same is by way of illustration and example only and is not to be construed in a limiting sense.

The contents not described here are sufficiently technically inferior to those skilled in the art, and a description thereof will be omitted.

Example

The light guide plate was made of acrylic resin. The light guide plate had a pitch of 0.02 mm and a radius of curvature of 0.0323 mm in the lens section of the incident end portion. As for the light-guide plate, the lenticular optical deflecting element of the surface part was 31.5 micrometers in pitch, and the curvature radius was 35 micrometers. The light deflecting portion having a triangular cross-section of the rear surface of the light guide plate having a pitch of 0.0636 mm (distances from a vertex angle of 1.441 µm and 62.159 µm), a corner angle of 150 °, and another angle of 29.256 ° and 0.744 ° were used.

The light guide was made of an acrylic resin. The light guide had a thickness of 85 占 퐉, and the convex prism having a triangular cross section at the back surface had a pitch of 26 占 퐉 and an prism inner angle of 62 占. As for the uneven | corrugated part prism of the arc-shaped cross section of a surface part, the thing of pitch of 31.5 micrometers and the radius of curvature of 35 micrometers was used.

The light guide plate and the light guide were assembled to manufacture a backlight unit.

Comparative Example

The same components as the backlight unit used in the above embodiment were used as a reflector plate, LED, and frame, and only the light guide plate was used as a general printed light guide plate.

Luminance was measured for the liquid crystal display device including the backlight unit manufactured in Examples and Comparative Examples. Luminance was measured by the luminance meter BM-7, and the current was 20mA, the voltage was 3.044V, the brightness was 2.07cd, and the power was 365.28mW. 5 points at a pitch of 6.75 mm for the light source and 5 rows at a pitch of 12.9 mm were measured for all 25 points. The results are shown in Table 1 below.

Average luminance (cd / m2) Brightness (cd / m2) Example 15,047 15,685 Comparative Example 12,730 12,402

As shown in Table 1, the backlight unit of the present invention has an increase in the average brightness and the maximum brightness compared to the backlight unit using a conventional printed light guide plate.

Claims (10)

A light guide plate; And
It is formed on the light guide plate, and includes a back surface portion into which the light emitted from the light guide plate enters, a surface portion for emitting the light to the outside, and a side portion connecting the back surface portion and the surface portion, the back surface portion is triangular in shape A plurality of prisms formed of an in-convex portion are formed, and the surface unit includes a light guide member having a plurality of prisms formed of an uneven portion having an arc shape in cross section. The light guide plate of claim 1, wherein the light guide plate is configured to connect an incident end surface portion to which light is input from a light source, a reflective end surface portion located on an opposite side of the incident end surface portion, and connect the incident end surface portion and the reflective end surface portion to emit light from the incident end surface portion. A surface portion, a rear surface portion opposite to the surface portion, and a side portion connecting the surface portion and the rear surface portion, wherein the rear surface portion is formed with an optical deflection portion for reflecting light from the incident end surface portion to the surface portion; And a light deflecting element for emitting the light at the surface portion. The backlight unit of claim 1, wherein the convex prism has a pitch of 10-35 μm and an internal angle of 40-75 °. The backlight unit of claim 1, wherein the unevenness prism has a pitch of 15-50 μm and a radius of curvature of 7-60 μm. The backlight unit according to claim 1, wherein the arc-shaped uneven portions are arranged side by side on the surface portion. The backlight unit of claim 1, wherein the convex prism and the uneven part prism are formed obliquely in the same direction, in the cross direction, or at an angle. The backlight unit according to claim 1, wherein the arrangement direction of the uneven portion prism is inclined at an inclination α of 1 to 15 ° with respect to the arrangement direction of the convex portion prism. The arc-shaped concave-convex portion and the triangular convex portion are formed in the same direction, and the bottom portion of the arc-shaped concave-convex portion and the apex portion of the triangular concave-convex portion have a positional relationship orthogonal to the light guide. The backlight unit having a. The arc-shaped concave-convex portion and the triangular-shaped concave-convex portion are formed in the same direction, and the bottom portion of the arc-shaped concave-convex portion and the bottom portion of the triangular concave-convex portion have a positional relationship perpendicular to the light guide. The backlight unit having a. 10. A liquid crystal display device comprising the backlight unit of claim 1.
KR1020120056930A 2012-05-29 2012-05-29 Back light unit and liquid crystal display comprising the same KR20130133569A (en)

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KR1020120056930A KR20130133569A (en) 2012-05-29 2012-05-29 Back light unit and liquid crystal display comprising the same

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3187966A1 (en) * 2016-01-04 2017-07-05 Lg Electronics Inc. Mobile terminal
KR20170081564A (en) * 2016-01-04 2017-07-12 엘지전자 주식회사 Mobile terminal
KR20170081563A (en) * 2016-01-04 2017-07-12 엘지전자 주식회사 Mobile terminal

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3187966A1 (en) * 2016-01-04 2017-07-05 Lg Electronics Inc. Mobile terminal
KR20170081564A (en) * 2016-01-04 2017-07-12 엘지전자 주식회사 Mobile terminal
KR20170081563A (en) * 2016-01-04 2017-07-12 엘지전자 주식회사 Mobile terminal
US10007381B2 (en) 2016-01-04 2018-06-26 Lg Electronics Inc. Mobile terminal

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