KR20120130919A - Backlgiht unit and liquid crystal display device the same - Google Patents

Backlgiht unit and liquid crystal display device the same Download PDF

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Publication number
KR20120130919A
KR20120130919A KR1020110048989A KR20110048989A KR20120130919A KR 20120130919 A KR20120130919 A KR 20120130919A KR 1020110048989 A KR1020110048989 A KR 1020110048989A KR 20110048989 A KR20110048989 A KR 20110048989A KR 20120130919 A KR20120130919 A KR 20120130919A
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KR
South Korea
Prior art keywords
light
light guide
source unit
light source
spacer
Prior art date
Application number
KR1020110048989A
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Korean (ko)
Inventor
김선웅
김영웅
김보라
Original Assignee
엘지디스플레이 주식회사
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Priority to KR1020110048989A priority Critical patent/KR20120130919A/en
Publication of KR20120130919A publication Critical patent/KR20120130919A/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
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0016—Grooves, prisms, gratings, scattering particles or rough surfaces
    • 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
    • G02B6/0028—Light guide, e.g. taper
    • 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
    • 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

Abstract

The present invention discloses a backlight unit that is advantageous for slimming and weight reduction.
The disclosed backlight unit includes a light source unit disposed on at least one side to emit light, a first light guide plate that converts light from the light source unit into surface light and emits light in a first direction, and converts light from the light source unit into surface light And a light refraction adhesive pattern formed between the second light guide plate and the first and second light guide plates to emit light in a second direction different from the first direction, thereby refracting light from the light source unit and fixing the first and second light guide plates. Characterized in that.

Description

BACKLGIHT UNIT AND LIQUID CRYSTAL DISPLAY DEVICE THE SAME}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backlight unit, and more particularly, to a liquid crystal display device having the backlight unit, which is advantageous for slimming and lightening.

A CRT (cathode ray tube), which is one of the widely used display devices, is mainly used for monitors such as a TV, a measurement device, and an information terminal device. However, due to the weight and size of the CRT itself, Could not respond positively to the response of

Therefore, in the trend of miniaturization and weight reduction of various electronic products, CRT has a certain limit in weight and size, and is expected to replace the liquid crystal display (LCD) and gas discharge using electro-optic effects. Plasma Display Panel (PDP) and Electro Luminescence Display (ELD) using the electroluminescent effect, and the like, among them, researches on liquid crystal displays are being actively conducted.

BACKGROUND ART Liquid crystal display devices have tended to be gradually widened due to their light weight, thinness, and low power consumption. Accordingly, the liquid crystal display device is proceeding in the direction of large-sized, thin, and low power consumption in response to the demand of the user.

BACKGROUND ART A liquid crystal display device is a display device that displays an image by controlling an amount of light passing through a liquid crystal, and is widely used for advantages such as thinning and low power consumption.

Unlike the CRT, the liquid crystal display is not a display device that emits light by itself, and thus, a back light unit including a separate light source is provided on the rear surface of the liquid crystal display panel to provide light for visually representing an image. .

The backlight unit is divided into an edge method and a direct method according to the position of the light source.

The edge type backlight unit is mainly applied to a relatively small liquid crystal display device such as a laptop computer and a desktop computer monitor, and has good light uniformity, long lifespan, and an advantage in thinning a liquid crystal display device. .

The direct type backlight unit began to be developed mainly as the size of the liquid crystal display device increased to 20 inches or more. will be. Such a direct-type backlight unit is mainly used for a large-screen liquid crystal display device which requires a high luminance because the utilization efficiency of light is higher than that of the edge type.

The backlight unit uses a plasma light source such as a cold cathode fluorescent lamp (CCFL), a hot cathode fluorescent tube (HCFL), an external electrode fluorescent tube (EEFL), and an external & internal electrode fluorescent tube (EIFL). Or a light emitting diode (LED) is used.

Among them, light emitting diodes (LEDs) are used for their advantages of long life, low power, small size, and high durability.

A general liquid crystal display device includes two liquid crystal display panels and a backlight unit between the two liquid crystal display panels for a bidirectional display.

Such a liquid crystal display device for two-way display is provided with two backlight units for providing light to the two liquid crystal display panels, respectively.

For example, a general liquid crystal display device for a bidirectional display includes two light guide plates for converting point light or flash light from a light source into surface light, and a reflective plate or a transflective plate is provided between the two light guide plates. Another general liquid crystal display device for a bidirectional display uses a single light guide plate, but a diffuser plate is provided at upper and lower portions of the light guide plate to guide light to the liquid crystal display panels provided on both sides.

As described above, a general liquid crystal display device for a bidirectional display has a disadvantage in that it is difficult to slim the reflective plate or the transflective plate or a plurality of diffuser plates for the bidirectional display, thereby increasing the manufacturing cost and weight.

SUMMARY OF THE INVENTION An object of the present invention is to provide a liquid crystal display device having the backlight unit, which is advantageous for slimming and lightening.

In a backlight unit according to an embodiment of the present invention,

A light source unit disposed on at least one side to emit light; A first light guide plate for converting light from the light source unit into surface light and emitting the light in a first direction; A second light guide plate for converting light from the light source unit into surface light and emitting the light in a second direction different from the first direction; And a light refraction adhesive pattern formed between the first and second light guide plates to refract the light from the light source unit and to fix the first and second light guide plates.

According to another embodiment of the present invention,

A light source unit disposed on at least one side to emit light; A first light guide plate for converting light from the light source unit into surface light and emitting the light in a first direction; A second light guide plate for converting light from the light source unit into surface light and emitting the light in a second direction different from the first direction; A first liquid crystal display panel on the first light guide plate; A second liquid crystal display panel on the second light guide plate; And a light refraction adhesive pattern formed between the first and second light guide plates to refract the light from the light source unit and to fix the first and second light guide plates.

The present invention refracts the light from the light source unit between the first and second light guide plates formed in a wedge shape or a flat shape which are symmetrical to each other to provide uniform light throughout the first and second light guide plates. The optical refractive adhesive pattern is formed to keep the spaced interval of the second light guide plate constant so that the structure can be simplified by eliminating the configuration of a diffuser plate, a reflector plate, or a semi-transmissive reflector plate included in a general liquid crystal display device for a bidirectional display. But it has an advantage in slimming.

In addition, the present invention has the advantage of reducing the manufacturing cost and light weight by simplifying the structure of the backlight unit.

In addition, the present invention has the advantage that the first and second light source units facing each other on the side surfaces of the first and second light guide plate to achieve a slimmer and at the same time improve the brightness.

1 is an exploded perspective view showing a liquid crystal display device for a bidirectional display according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view of a liquid crystal display for bidirectional display taken along the line II ′ of FIG. 1.
3 is a plan view illustrating a second light guide plate and a light refractive adhesive pattern of FIG. 1.
4 is a view illustrating region A of FIG. 2.
5 is a cross-sectional view illustrating a liquid crystal display device for a bidirectional display according to another embodiment of the present invention.
FIG. 6 is a plan view illustrating the second LGP and the light refractive adhesive pattern of FIG. 5.
7 is a cross-sectional view illustrating a liquid crystal display device for a bidirectional display according to another embodiment of the present invention.
FIG. 8 is a plan view illustrating the second LGP and the light refractive adhesive pattern of FIG. 7.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the accompanying drawings, embodiments of the present invention will be described in detail.

1 is an exploded perspective view showing a liquid crystal display device for a bidirectional display according to an embodiment of the present invention, Figure 2 is a cross-sectional view showing a liquid crystal display device for a bidirectional display cut along the line II 'of FIG. .

3 is a plan view illustrating a second light guide plate and a photorefractive adhesive pattern of FIG. 1, and FIG. 4 is a view illustrating region A of FIG. 2.

1 to 4, a liquid crystal display device for bidirectional display according to an exemplary embodiment of the present invention includes first and second liquid crystal display panels 110a and 110b for displaying an image, and the first and second displays. And a backlight unit 120 disposed between the liquid crystal display panels 110a and 110b to irradiate light.

The first and second liquid crystal display panels 110a and 110b may include a color filter substrate and a thin film transistor (TFT) substrate bonded together to maintain a uniform cell gap facing each other, and a liquid crystal interposed between the two substrates. Layer.

Although not shown in detail in the drawings, the color filter substrate and the thin film transistor substrate will be described in more detail. In the thin film transistor substrate, a plurality of gate lines and data lines cross each other to define a pixel, and a thin film transistor (TFT) is formed at each cross region. : thin film transistor) is provided and is connected one-to-one with the pixel electrode mounted on each pixel. The color filter substrate includes a color filter of R, G, and B colors corresponding to each pixel, a black matrix bordering each of them, and covering a gate line, a data line, a thin film transistor, and the like, and a common electrode covering all of them.

The first driving PCB 111a for supplying driving signals to the gate line and the data line is provided at the edge of the first liquid crystal display panel 110a.

The first driving PCB 111a is electrically connected to the first liquid crystal display panel 110a by a first chip on film 113a.

A second driving PCB 111b for supplying a driving signal to the gate line and the data line is provided at the edge of the second liquid crystal display panel 110b.

The second driving PCB 111b is electrically connected to the second liquid crystal display panel 110b by a second chip on film 113b. Here, the first and second COFs 113a and 113b may be changed to a tape carrier package (TCP).

The backlight unit 120 for providing light to the first and second liquid crystal display panels 110a and 110b is disposed on one side and disposed in parallel with the light source unit 150 to emit light. First and second light guide plates 140 and 142 for converting point light into surface light, first optical sheets 130 disposed on the first light guide plate 140 to diffuse and collect light, and the second light guide plate Second optical sheets 160 disposed below the 142 to diffuse and focus light.

The light source unit 150 includes a printed circuit board 151 on which a conductive pattern is formed, and a plurality of light emitting diodes 153 mounted on the printed circuit board 151 at regular intervals.

The first LGP 140 of the present invention converts the light incident from the light source unit 150 into surface light to provide the surface light to the first liquid crystal display panel 110a.

The second LGP 142 of the present invention converts the light incident from the light source unit 150 into surface light and provides the surface light to the second liquid crystal display panel 110b.

The first and second light guide plates 140 and 142 may have a wedge shape.

In detail, the first LGP 140 has a gradually thicker thickness from a region adjacent to the light source unit 150 to a region far from the light guide unit 150.

An upper surface of the first LGP 140 may have a flat shape parallel to the first LCD panel 110a, and a lower surface of the first LGP 140 may have a predetermined inclined surface.

The second LGP 142 has a thickness that gradually becomes thinner from a region adjacent to the light source unit 150 to a distant region.

An upper surface of the second LGP 142 has a predetermined inclined surface, and a lower surface of the second LGP 142 has a flat shape parallel to the second LCD panel 110b.

The lower surface of the first LGP 140 and the upper surface of the second LGP 142 face each other and are formed as inclined surfaces that are symmetric to each other. That is, the first and second light guide plates 140 and 142 have a wedge shape that is symmetrical to each other, and thus have a structure that is advantageous for slimming.

The light refractive adhesive pattern 144 is further included between the first and second light guide plates 140 and 142 of the present invention.

The light refraction adhesive pattern 144 has a function of fixing the first and second light guide plates 140 and 142 at regular intervals, and at the same time, refracts light incident from the light source unit 150 to refraction the first and second light guide plates 140 and 142. The light guide plates 140 and 142 may be uniformly dispersed.

The light refractive adhesive pattern 144 may be formed through a printing process.

The light refractive adhesive pattern 144 is formed in a diamond shape.

The light refraction adhesive pattern 144 is a spacer 148 for refracting light in the adhesive material 146 and the adhesive material 146, and maintaining a constant distance between the first and second light guide plates 140 and 142. It includes.

The light refraction adhesive pattern 144 has a structure in which the density gradually increases to a region far from the region adjacent to the light source unit 150.

The light refraction adhesive pattern 144 has a space between the light source unit 150 having a relatively high amount of light and is spaced apart from each other, and has a narrow space between the light source unit 150 having a relatively low amount of light and a farther area. Therefore, the present invention may implement uniform luminance uniformly by the density of the optical refraction adhesive pattern 144.

The spacer 148 of the light refractive adhesive pattern 144 has a larger refractive index than air, and in particular, the spacer 148 has a refractive index of 1.3 to 1.7.

The spacer 148 may be made of any one of silica, silicon, nylon, polybuthylmethylacrylate (PBMA), polymethylmethacrylate (PMMA), polystyrene (PS), and polyurethane (PU). .

The spacer 148 of the present invention may be formed in the adhesive material 146 in a form dispersed in the adhesive material 146.

The spacer 148 of the present invention maintains the distance g between the first and second light guide plates 140 and 142 at 0.1 μm to 1 μm. Thus, the spacer 148 may be made of beads of 1 μm or less.

In the liquid crystal display device for bidirectional display according to the present invention, the first and second LGPs 140 and 142 are formed in a wedge shape in which the optical refraction adhesive patterns 144 are formed between the first and second LGPs 140 and 142. Refracting light from the light source unit 150 to provide uniform light to the entirety of the first and second light guide plates 140 and 142, and between the first and second light guide plates 140 and 142. By maintaining the spaced distance at a constant, the structure of the diffuser or reflector or semi-transmissive reflector provided in the general liquid crystal display device for a bidirectional display can be removed to simplify the structure and has an advantage in slimming.

In addition, the present invention reduces the manufacturing cost by simplifying the structure of the backlight unit 120, and has the advantage of light weight.

5 is a cross-sectional view illustrating a liquid crystal display device for a bidirectional display according to another exemplary embodiment of the present invention, and FIG. 6 is a plan view illustrating a second light guide plate and a light refractive adhesive pattern of FIG. 5.

As shown in FIG. 5 and FIG. 6, the liquid crystal display device for the bidirectional display according to another exemplary embodiment of the present invention has all components except for the light refractive adhesive pattern 244 and the first and second light source units 150a and 150b. The same reference numerals are used in the same manner as the liquid crystal display device for the interactive display according to the exemplary embodiment of the present invention, and detailed description thereof will be omitted.

The first and second light source units 150a and 150b according to another embodiment of the present invention are provided on both sides of the wedge-shaped first and second light guide plates 140 and 142, respectively.

That is, the first light source unit 150a is provided at one side of the first light guide plate 140 and the other side of the second light guide plate 142, and the second light source unit 150b is provided at the other side and the second side of the first light guide plate 140. It is provided on one side of the light guide plate 142.

The first light source unit 150a includes a first printed circuit board 151a and a plurality of first light emitting diodes 153a mounted on the first printed circuit board 151a, and the second light source unit 150b ) Includes a second printed circuit board 151b and a plurality of second light emitting diodes 153b mounted on the second printed circuit board 151b.

The light refraction adhesive pattern 244 has a structure in which density increases gradually from both sides adjacent to the first and second light source units 150a and 150b on the second light guide plate 142 toward the central region C. FIG.

The light refractive adhesive pattern 244 may be formed through a printing process.

The light refractive adhesive pattern 244 is formed in a diamond shape.

Although not shown in detail in the drawings, the light refractive adhesive pattern 244 according to another embodiment of the present invention is the same as the light refractive adhesive pattern 144 of FIG. Include.

The spacer of the light refractive adhesive pattern 244 has a refractive index larger than that of air, and in particular, the spacer has a refractive index of 1.3 to 1.7.

The spacer may be made of any one of silica, silicon, nylon, polybuthylmethylacrylate (PBMA), polymethylmethacrylate (PMMA), polystyrene (PS), and polyurethane (PU).

The spacer of the present invention may be formed in the adhesive material in a form that is dispersed in the adhesive material.

The spacer of the present invention maintains the interval between the first and second light guide plates 140 and 142 at 0.1 μm to 1 μm. Therefore, the spacer may be made of beads of 1 μm or less.

In the liquid crystal display device for bidirectional display according to the present invention, the first and second LGPs 140 and 142 are formed in a wedge shape in which the optical refractive adhesive material 244 is formed between the first and second LGPs 140 and 142. Refracting light from the first and second light source units 150a and 150b to provide uniform light to the entirety of the first and second light guide plates 140 and 142, and the first and second light guide plates. By maintaining the spaced intervals 140 and 142 constant, the structure of the diffuser plate or the reflector plate or the transflective plate included in the liquid crystal display device for a general interactive display can be eliminated, thereby simplifying the structure and advantageous for slimming. Has

In addition, the present invention has the advantage of reducing the manufacturing cost and light weight by simplifying the structure of the backlight unit.

In addition, the present invention is provided with the first and second light source units 150a and 150b facing each other on the side surfaces of the first and second light guide plates 140 and 142, thereby realizing slimming and improving luminance. Has

FIG. 7 is a cross-sectional view illustrating a liquid crystal display device for a bidirectional display according to another exemplary embodiment. FIG. 8 is a plan view illustrating a second light guide plate and a light refractive adhesive pattern of FIG. 7.

As shown in FIG. 7 and FIG. 8, the liquid crystal display device for the bidirectional display according to another embodiment of the present invention has all configurations except the light source unit 250 and the first and second light guide plates 240 and 242. The same reference numerals are used in the same manner as in the liquid crystal display device for interactive display according to the exemplary embodiment of the present invention, and detailed description thereof will be omitted.

The first and second LGPs 240 and 242 according to another exemplary embodiment of the present invention are disposed at regular intervals by the light refractive adhesive pattern 144. That is, the first and second light guide plates 240 and 242 have a flat shape with upper and lower surfaces horizontally.

The light source unit 250 includes a printed circuit board 251 and a plurality of first and second light emitting diodes 253a and 253b mounted on the printed circuit board 251.

The first light emitting diode 253a is disposed in parallel with the second light guide plate 242 to provide light to one side of the second light guide plate 242, and the second light emitting diode 253b is the first light guide plate 240. It is disposed in parallel with one another to provide light to one side of the first light guide plate 240.

Although not shown in detail in the drawings, the light refractive adhesive pattern 144 according to another embodiment of the present invention is the same as the light refractive adhesive pattern 144 of FIG. It includes.

The spacer of the light refractive adhesive pattern 144 has a larger refractive index than air, and in particular, the spacer has a refractive index of 1.3 to 1.7.

The spacer may be made of any one of silica, silicon, nylon, polybuthylmethylacrylate (PBMA), polymethylmethacrylate (PMMA), polystyrene (PS), and polyurethane (PU).

The spacer of the present invention may be formed in the adhesive material in a form that is dispersed in the adhesive material.

The spacer of the present invention maintains the interval between the first and second light guide plates 240 and 242 at 0.1 μm to 1 μm. Therefore, the spacer may be made of beads of 1 μm or less.

In the liquid crystal display device for a bidirectional display according to the present invention, a light refraction adhesive pattern 144 is formed between the first and second light guide plates 240 and 242 to form a flat shape between the first and second light guide plates 240 and 242. The light from the light source unit 250 is refracted to provide uniform light to the entirety of the first and second LGPs 240 and 242, and spaced apart from the first and second LGPs 240 and 242. By maintaining a constant, it is possible to simplify the structure by eliminating the configuration of the diffusion plate or reflector or semi-transmissive reflector provided in the liquid crystal display device for a general interactive display, as well as having an advantage in slimming.

In addition, the present invention has the advantage of reducing the manufacturing cost and light weight by simplifying the structure of the backlight unit.

The liquid crystal display device for the bidirectional display according to another exemplary embodiment of the present invention has been described with a limited structure in which the light source unit 250 is provided on one side of the first and second light guide plates 240 and 242, but is not limited thereto. In addition, a separate light source unit may be further provided on the other side of the first and second light guide plates 240 and 242 to improve the overall brightness of the backlight unit.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. 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.

140 and 240: first light guide plate 142 and 242: second light guide plate
144 and 244: light refracting adhesive patterns 150 and 250: light source unit

Claims (20)

A light source unit disposed on at least one side to emit light;
A first light guide plate for converting light from the light source unit into surface light and emitting the light in a first direction;
A second light guide plate for converting light from the light source unit into surface light and emitting the light in a second direction different from the first direction; And
And a light refraction adhesive pattern formed between the first and second light guide plates to refract light from the light source unit and to fix the first and second light guide plates. The method according to claim 1,
The light refractive adhesive pattern may include an adhesive material and a spacer for refracting light in the adhesive material and maintaining a constant gap between the first and second light guide plates. The method of claim 2,
And the spacer has a refractive index greater than that of air. The method of claim 2,
The spacer unit has a refractive index of 1.3 to 1.7. The method of claim 2,
The spacer unit of claim 1, characterized in that made of beads of less than 1㎛. The method of claim 2,
The spacer is characterized in that made of any one of silica (Silica), silicon (Silicon), nylon (Nylon), PBMA (Polybuthylmethylacrylate), PMMA (Polymethylmethacrylate), polystyrene (PS: Polystyrene), polyurethane (PU: Polyurethane) Backlight unit. The method according to claim 1,
The light refractive adhesive pattern is a backlight unit, characterized in that formed in the diamond shape through a printing process. The method according to claim 1,
The light refractive adhesive pattern is a backlight unit, characterized in that the density gradually increases from the light source unit to the area far from the adjacent area. The method according to claim 1,
And the first and second light guide plates have an inclination angle in which surfaces facing each other are symmetrical. The method according to claim 1,
The first and second light guide plates are formed in a wedge shape or a flat shape. The method according to claim 1,
The light source unit includes a plurality of first light emitting diodes arranged in parallel with the first light guide plate and a plurality of second light emitting diodes arranged in parallel with the second light guide plate. A light source unit disposed on at least one side to emit light;
A first light guide plate for converting light from the light source unit into surface light and emitting the light in a first direction;
A second light guide plate for converting light from the light source unit into surface light and emitting the light in a second direction different from the first direction;
A first liquid crystal display panel on the first light guide plate;
A second liquid crystal display panel on the second light guide plate; And
And a light refraction adhesive pattern formed between the first and second light guide plates to refract light from the light source unit and to fix the first and second light guide plates. The method of claim 12,
The light refractive adhesive pattern may include an adhesive material and a spacer for refracting light in the adhesive material and maintaining a constant distance between the first and second light guide plates. The method of claim 13,
And the spacer has a refractive index greater than that of air. The method of claim 13,
And the spacer has a refractive index of about 1.3 to about 1.7. The method of claim 13,
And the spacer is formed of beads having a thickness of 1 μm or less. The method of claim 13,
The spacer is characterized in that made of any one of silica (Silica), silicon (Silicon), nylon (Nylon), PBMA (Polybuthylmethylacrylate), PMMA (Polymethylmethacrylate), polystyrene (PS: Polystyrene), polyurethane (PU: Polyurethane) LCD display device. The method of claim 12,
The optical refraction adhesive pattern is formed in a diamond shape through a printing process. The method of claim 12,
And wherein the optical refraction adhesive pattern gradually increases in density toward an area far from an area adjacent to the light source unit. The method of claim 12,
The first and second light guide plates are formed in a wedge shape or a flat shape.
KR1020110048989A 2011-05-24 2011-05-24 Backlgiht unit and liquid crystal display device the same KR20120130919A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101446398B1 (en) * 2012-12-14 2014-10-02 엘지디스플레이 주식회사 Optical film and back light unit thereof
US9874772B2 (en) 2015-02-26 2018-01-23 Samsung Display Co., Ltd. Flexible display and manufacturing method thereof
US10036845B2 (en) 2015-06-12 2018-07-31 Samsung Display Co., Ltd. Curved display device and method of manufacturing the same
US10454047B2 (en) * 2016-04-21 2019-10-22 Samsung Display Co., Ltd. Flexible display device

Cited By (5)

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