KR20120077564A - Liquid crystal display device for dual display - Google Patents

Liquid crystal display device for dual display Download PDF

Info

Publication number
KR20120077564A
KR20120077564A KR1020100139562A KR20100139562A KR20120077564A KR 20120077564 A KR20120077564 A KR 20120077564A KR 1020100139562 A KR1020100139562 A KR 1020100139562A KR 20100139562 A KR20100139562 A KR 20100139562A KR 20120077564 A KR20120077564 A KR 20120077564A
Authority
KR
South Korea
Prior art keywords
guide plate
light guide
liquid crystal
light
display device
Prior art date
Application number
KR1020100139562A
Other languages
Korean (ko)
Inventor
강대일
한재정
Original Assignee
엘지디스플레이 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 엘지디스플레이 주식회사 filed Critical 엘지디스플레이 주식회사
Priority to KR1020100139562A priority Critical patent/KR20120077564A/en
Publication of KR20120077564A publication Critical patent/KR20120077564A/en

Links

Images

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—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
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0053—Prismatic sheet or layer; Brightness enhancement element, sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—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
    • 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
    • G02F1/133524—Light-guides, e.g. fibre-optic bundles, louvered or jalousie light-guides
    • 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
    • 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
    • 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
    • G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
    • G02F1/1362—Active matrix addressed cells
    • G02F1/136286—Wiring, e.g. gate line, drain line
    • 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
    • G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
    • G02F1/1362—Active matrix addressed cells
    • G02F1/1368—Active matrix addressed cells in which the switching element is a three-electrode device

Abstract

PURPOSE: A liquid crystal display device for a dual display is provided to increase picture quality and reduce manufacturing costs. CONSTITUTION: First optical sheets(130) are arranged in a lower part of a first liquid crystal panel(110). A light guide plate(150) is arranged in a lower part of the first optical sheets. The light guide plate converts light of light sources(172,192) to planar light. A plurality of patterns has a single structure, a double structure, or a triple structure in the light guide plate. The light sources are arranged on both sides of the light guide plate. Second optical sheets(140) are arranged in a lower part of the light guide plate. A second liquid crystal panel(120) is arranged in a lower part of the second optical sheets.

Description

Liquid crystal display device for dual-sided display

The present invention relates to a liquid crystal display device for a double-sided display, and more particularly, to a liquid crystal display device for a double-sided display that can reduce manufacturing costs and improve the screen quality.

The display device is a visual information transmission medium, which visually displays data in the form of characters or figures on a CRT surface.

In general, a flat panel display (FPD) device is a thinner and lighter image display device using a TV or computer monitor CRT, which is a liquid crystal display (LCD) using liquid crystal. ), PDP (Plasma Display Panel) using gas discharge, OLED (Organic Light Emitting), an organic material made by using light emitting phenomenon that emits light when electric current flows in fluorescent organic compound, and charged particles in electric field are anode or cathode EPD (Electric Paper Display) using the phenomenon of moving toward the.

The most representative liquid crystal display device of a flat panel display device displays a desired image by individually supplying data signals according to image information to pixels arranged in an active matrix form to adjust light transmittance of the pixels.

In order to implement such a liquid crystal display device as a liquid crystal display device for a double-sided display, two liquid crystal display devices may be attached.

1 is a cross-sectional view showing a conventional liquid crystal display device for a double-sided display, Figure 2 is a view showing a light guide plate used in the conventional liquid crystal display device for a double-sided display.

Referring to FIG. 1, a liquid crystal display device for a double-sided display is disposed between the first and second liquid crystal panels 10 and 20 and the first and first liquid crystal panels 10 and 20, and the first and second liquid crystal panels. And backlight units 70 and 90 for irradiating light to each of 10 and 20.

In this case, the first and second liquid crystal panels 10 and 20 are respectively injected with liquid crystal between the upper substrates 10a and 20a and the lower substrates 10b and 20b, and the upper and lower substrates 10a and 20a and 10b, respectively. And a spacer (not shown) for maintaining a constant gap between 20b).

Although not shown in the drawings, a plurality of black matrices and color filters are formed on each of the upper substrates 10a and 20a of each of the first and second liquid crystal panels 10 and 20. In addition, a plurality of gate lines (not shown) and data lines (not shown) are formed on the lower substrates 10b and 20b of each of the first and second liquid crystal panels 10 and 20, respectively. A plurality of thin film transistors are formed in the intersection region of the line and the data line.

A lower polarizer (not shown) for polarizing light from the backlight units 70 and 90 is attached to the rear surface of each of the first and second liquid crystal panels 10 and 20, and the first and second liquid crystal panels 10 are disposed on the upper surface of the first and second liquid crystal panels 10 and 20. 20) An upper polarizer (not shown) for polarizing light passing through each is attached.

The backlight units 70 and 90 may include light sources 72 and 92, light source housings 74 and 94 surrounding the light sources, and light incident from the light sources 72 and 92, respectively, to the first and second liquid crystal panels 10 and 20. To the light guide plate 50, the first optical sheets 32, 34 and 36 stacked on the front surface of the light guide plate 50, and the second optical sheets 42, 44 stacked on the back surface of the light guide plate 50. 46).

In this case, the light sources 72 and 92 may be light emitting diodes (LEDs) in which at least one is arranged in a line on a flexible circuit board (not shown), and may be disposed on both sides of the light guide plate 50, respectively. have. The light generated by the light sources 72 and 92 is incident on the light guide plate 50 through an incident surface present on the side of the light guide plate 50, and the light source housings 74 and 94 each have a reflective surface on the inner surface thereof. It serves to reflect the light from 72, 92 toward the incident surface of the light guide plate 50.

The light guide plate 50 converts the light incident from the light sources 72 and 92 through the incident surface into a planar light source and emits the light to the first and second liquid crystal panels 10 and 20.

The first optical sheets 32, 34, and 36 are attached to the light guide plate 50, and include one or more first diffusion sheets 32 and one or more first prism sheets 34 and 36. Light incident from the surface of 50 may be diffused through the entire first liquid crystal panel 10 to be uniformly irradiated.

In addition, the second optical sheets 42, 44, and 46 are attached to the rear surface of the light guide plate 50 and include at least one second diffusion sheet 42 and at least one second prism sheet 44, 46. In addition, the light incident from the surface of the light guide plate 50 may be diffused to the entire second liquid crystal panel 20 to be uniformly irradiated.

Accordingly, the light emitted from the light guide plate 50 passes through the first and second prism sheets 34 and 36 and the second prism sheets 44 and 46 via the first and second diffusion sheets 32 and 42. And incident on the second liquid crystal panels 10 and 20.

As described above, the backlight units 70 and 90 of the conventional liquid crystal display device for a double-sided display are designed to emit light uniformly from both sides. In this case, as shown in FIG. 2, an intaglio or embossed pattern 52 is formed on the top and bottom surfaces of the light guide plate 50, and the light emitted from the light sources 72 and 92 is applied to the patterns formed on the light guide plate 50. The scattering is generated by hitting the light so that light beyond the critical angle of the light is emitted to the liquid crystal panel.

However, the light emitted from the light sources 72 and 92 is blocked by the patterns formed on the upper and lower surfaces of the light guide plate 50 so that the patterns 52 formed on the light guide plate 50 are viewed. As a result, a phenomenon in which the screen quality of the liquid crystal display is deteriorated occurs.

In addition, the patterns 52 formed on the light guide plate 50 may be formed by a method such as a printing method, a laser 60, injection and roll stamping. As shown in FIG. 2, when the pattern 52 is formed on the light guide plate 50 using the laser 60, after the patterns are formed on the bottom surface of the light guide plate 50, the light guide plate 50 is inverted to form a pattern on the top surface. Will form. Therefore, an additional process for patterning one side of the light guide plate 50 first and the other side is required, thereby increasing the manufacturing cost.

The present invention is to solve the above problems, to provide a liquid crystal display device for a two-sided display can reduce the manufacturing cost, and improve the screen quality.

Other objects and features of the present invention will be described in the configuration and claims of the invention described below.

In order to achieve the above objects, the liquid crystal display device for a double-sided display according to an embodiment of the present invention, the first liquid crystal panel, the first optical sheets disposed under the first liquid crystal panel, the first optical sheet A light guide plate disposed at a lower portion of the light source and converting light incident from the light source into a planar light source, a light guide plate having a plurality of patterns formed therein in a single structure, a double structure, or a triple structure, a light source disposed at both sides of the light guide plate, and disposed below the light guide plate Second optical sheets and a second liquid crystal panel disposed under the second optical sheets.

The pattern formed inside the light guide plate is formed by a green laser.

The pattern formed inside the light guide plate is formed in a dot shape.

The plurality of patterns formed in the light guide plate are formed in a single structure that rises from the left to the right while having a predetermined interval.

The plurality of patterns formed in the light guide plate are formed in a double structure that rises from the left to the right while having a predetermined interval.

The plurality of patterns formed in the light guide plate are formed in a triple structure that rises from left to right with a predetermined interval.

When the pattern is viewed from above, the center has a vertex shape having a vertex in the center portion, and when the pattern is viewed from the side, the bottom surfaces of the tetrahedron have a form in which they adhere to each other.

The size of the pattern formed inside the light guide plate is 0.5 mm or less.

The size, spacing, and density of the pattern formed in the light guide plate vary depending on the distance from the light source, the type of light source, and the position where the light source is disposed.

The plurality of patterns formed in the light guide plate are formed in a single structure that goes down from left to right with a predetermined interval.

The plurality of patterns formed in the light guide plate are formed in a double structure descending from the left to the right while having a predetermined interval.

The plurality of patterns formed in the light guide plate are formed in a triple structure descending from the left to the right with a predetermined interval.

As described above, the liquid crystal display device for a double-sided display according to the present invention can reduce manufacturing costs and provide an effect of improving screen quality.

1 is a cross-sectional view showing a conventional liquid crystal display device for a double-sided display.
2 is a view showing a light guide plate used in a conventional liquid crystal display device for a double-sided display.
4 illustrates a light guide plate according to an embodiment of the present invention.
5 is a view in which an actual pattern is formed on the light guide plate;
FIG. 6 is a view in which a double structure pattern is formed inside a light guide plate; FIG.
7 is a view showing an actual double structure pattern on a light guide plate;
8 is a view showing a three-layered pattern formed inside the light guide plate.
9A and 9B show patterns of a three-layer structure.
10 is a view showing the actual triple structure pattern on the light guide plate.
11 illustrates a light guide plate according to another embodiment of the present invention.
12 is a view showing a double structured pattern formed inside a light guide plate;
FIG. 13 is a view showing a three-layered pattern formed inside a light guide plate; FIG.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the liquid crystal display device for a double-side display according to the present invention.

3 is a cross-sectional view illustrating a liquid crystal display device for a double-sided display according to an exemplary embodiment of the present invention.

Referring to FIG. 3, a liquid crystal display device for a double-sided display according to an exemplary embodiment of the present invention is disposed between the first and second liquid crystal panels 110 and 120 and the first and first liquid crystal panels 110 and 120. And backlight units 170 and 190 for irradiating light to the first and second liquid crystal panels 110 and 120, respectively.

In this case, liquid crystal is injected between the first and second liquid crystal panels 110 and 120, respectively, between the upper substrates 110a and 120a and the lower substrates 110b and 120b, and the upper and lower substrates 110a and 120a and 110b, respectively. And a spacer (not shown) for maintaining a constant gap therebetween.

Although not shown in the drawings, a plurality of black matrices and color filters are formed on the upper substrates 110a and 120a of the first and second liquid crystal panels 110 and 120, respectively. In addition, a plurality of gate lines (not shown) and data lines (not shown) are formed on the lower substrates 110b and 120b of each of the first and second liquid crystal panels 110 and 120, respectively. A plurality of thin film transistors are formed in the intersection region of the line and the data line.

An upper polarizing plate (not shown) for polarizing light from the backlight units 170 and 190 is attached to a front surface of each of the first and second liquid crystal panels 110 and 120, and a rear surface of the first and second liquid crystal panels 10 and 120. 20) a lower polarizer (not shown) for polarizing light passing through each is attached.

The backlight units 170 and 190 may include light sources 172 and 192, light source housings 174 and 194 surrounding the light sources, and light incident from the light sources 172 and 192. To the light guide plate 150, the first optical sheets 132, 134 and 136 stacked on the front surface of the light guide plate 150, and the second optical sheets 142, 144 stacked on the rear surface of the light guide plate 150. 146).

In this case, the light sources 172 and 192 may be light emitting diodes (LEDs) in which at least one is arranged in a line on a flexible circuit board (not shown), and may be disposed on both sides of the light guide plate 150. Light generated by the light sources 172 and 192 is incident on the light guide plate 150 through an incident surface existing on the side surface of the light guide plate 150, and the light source housings 174 and 194 have a reflective surface on the inner surface thereof. It serves to reflect the light from the 192 toward the incident surface of the light guide plate 150.

The light guide plate 150 converts the light incident from the light sources 172 and 192 through the incident surface into a planar light source and emits the light to the first and second liquid crystal panels 110 and 120.

The first optical sheets 132, 134, and 136 are attached onto the light guide plate 150, and include one or more first diffusion sheets 132 and one or more first prism sheets 134 and 136, and include the light guide plates. Light incident from the surface of 150 may be diffused through the entire first liquid crystal panel 110 to be uniformly irradiated.

In addition, the second optical sheets 142, 144, and 146 are attached to the rear surface of the light guide plate 150 and include at least one second diffusion sheet 142 and at least one second prism sheet 144, 146. In addition, light incident from the surface of the light guide plate 150 may be diffused to the entire second liquid crystal panel 120 to be uniformly irradiated.

Accordingly, the light emitted from the light guide plate 150 passes through the first and second prism sheets 134 and 136 and the second prism sheets 144 and 146 via the first and second diffusion sheets 132 and 142. And incident on the second liquid crystal panels 110 and 120.

4 is a view showing a light guide plate according to an embodiment of the present invention, FIG. 5 is a view showing an actual pattern formed on the light guide plate, FIG. 6 is a view in which a double structure pattern is formed inside the light guide plate, and FIG. 7 is a light guide plate. FIG. 8 is a view showing a three-layered pattern formed inside a light guide plate, and FIGS. 9A and 9B are views showing a three-layered pattern, and FIG. 10 is an actual tripled structure formed on a light guide plate. It is a figure which formed the pattern.

Referring to FIG. 4, a plurality of patterns 152 are uniformly formed at predetermined intervals d1 in the light guide plate 150 according to the exemplary embodiment of the present invention. In this case, the plurality of patterns 152 formed inside the light guide plate 150 are formed in a single structure that rises from the left side to the right side of the light guide plate 150, and the pattern 152 is formed by a green laser, for example, a dot ( dot) may be formed.

Here, the size s1 of the pattern 152 may be, for example, 0.1 to 0.5 mm, and the distance d1 between the patterns may be 0.3 to 0.6 mm. In this case, the size s1, the distance d1, and the density of the pattern 152 may vary depending on the distance from the light sources 172 and 192, the types of the light sources 172 and 192, and the positions of the light sources 172 and 192. It may vary.

FIG. 5 illustrates a diagram in which the size of the pattern 152 is 0.4 mm in the inside of the light guide plate 150. Since the size of the pattern 152 is not small, the screen quality of the LCD may be improved. have.

Referring to FIG. 6, a plurality of patterns 152_1 are constantly formed in the light guide plate 150_1 according to an embodiment of the present invention with a predetermined distance d2. In this case, the plurality of patterns 152_1 formed in the light guide plate 150_1 are formed in a dual structure that rises from the left side to the right side of the light guide plate 150_1, and the pattern 152_1 is formed of, for example, a dot (eg, by green laser). dot) may be formed.

Here, the size s2 of the pattern 152_1 may be, for example, 0.1 to 0.5 mm, the interval d2 between the patterns 152_1 may be 0.3 to 0.6 mm, and between the patterns 152_1. Pitch (p1) of may be 0.2 ~ 0.4mm. At this time, the size s2, the interval d2, and the density of the pattern 152_1 depend on the distance from the light sources 172 and 192, the types of the light sources 172 and 192, and the positions of the light sources 172 and 192. It may vary.

FIG. 7 illustrates a diagram in which the size of the dual structure pattern 152_1 is 0.1 mm, the space between the patterns is 0.5 mm, and the pitch is 0.3 mm, and the size of the pattern 152_1 is actually formed in the light guide plate 150_1. Since it is small and cannot be visually recognized, the screen quality of the liquid crystal display device can be improved.

Referring to FIG. 8, a plurality of patterns 152_2 are uniformly formed at predetermined intervals in the light guide plate 150_2 according to the exemplary embodiment. In this case, the plurality of patterns 152_2 formed in the light guide plate 150_2 are formed in a triple structure that rises from the left to the right direction.

Here, the pattern 152_2 formed in the light guide plate 105_2 may have a quadrangular shape having a vertex, that is, a first point P11, at a center portion when viewed from above, as shown in FIG. 9A. In this case, each of the points P11 to P15 represents the patterns 152_2, and the distance d3 between the second point P12 and the third point P13 and the third point P13 and the fifth point P15. The distance d4 between) may be 0.7 to 0.9 mm, and the distance d5 between the first point P11 and the fourth point P14 may be 0.3 to 0.5 mm.

In addition, the pattern 152_2 formed in the light guide plate 105_2 has a form in which the bottom surfaces of the tetrahedron are bonded to each other when viewed from the side, as shown in FIG. 9B, and the first point P11 and the sixth point P16. Height h1 between may be 0.15 ~ 0.17mm.

FIG. 10 illustrates a structure in which a triple structure 152_2 is formed inside the light guide plate 150_2. Since the size of the pattern 152_2 is not small, the screen quality of the LCD may be improved.

As described above, when the light guide plates 150, 150_1 and 150_2 having the patterns 152, 152_1 and 152_2 formed therein are used, the light guide plates 150, 150_1 and 150_2 are respectively disposed from the light sources 172 and 192 respectively disposed on both sides of the light guide plates 150, 150_1 and 150_2. Outgoing light is incident on the light guide plates 150, 150_1, and 150_2 through the incident surface, and the light incident from the light sources 172 and 192 through the incident surface is converted into a planar light source to convert the first and second liquid crystal panels 110, 120). 4, 6, and 8, light incident from the light sources 172 and 192 hits a plurality of patterns 152 formed inside the light guide plates 150, 150_1, and 150_2, so that scattering occurs, thereby causing a critical angle of light. Light exiting the first and second liquid crystal panels 110 and 120 is emitted.

Accordingly, in one embodiment of the present invention, as shown in the related art of FIG. 1, light emitted from the light sources 72 and 92 is masked by patterns formed on the upper and lower surfaces of the light guide plate 50 to form the light guide plate 50. The phenomenon that the pattern 52 is visually recognized can be prevented from occurring. Accordingly, it is possible to prevent the screen quality of the liquid crystal display from deteriorating.

In addition, in the exemplary embodiment of the present invention, unlike the prior art of forming patterns on the upper and lower surfaces of the light guide plate 50 through two laser patterning processes, inside the light guide plates 150, 150_1, and 150_2 through one laser patterning process. By forming the patterns 152, 152_1 and 152_2 in the number of steps, the number of processes can be reduced, thereby reducing manufacturing costs.

11 is a view showing a light guide plate according to another embodiment of the present invention, FIG. 12 is a view showing a double structure pattern formed inside the light guide plate, and FIG. 13 is a view showing a three layer pattern formed inside the light guide plate.

Referring to FIG. 11, a plurality of patterns 252 are uniformly formed at predetermined intervals in an interior according to another embodiment of the present invention. In this case, the plurality of patterns 252 formed in the light guide plate 250 are formed in a single structure descending from the left side to the right side of the light guide plate 250, and the pattern 252 is formed of, for example, dots (green dots) by a green laser. dot) may be formed.

Here, the size of the pattern 252 may be formed, for example, 0.1 ~ 0.5mm, the spacing between the patterns may be 0.3 ~ 0.6mm. In this case, the size, spacing, and density of the pattern 252 may vary depending on the distance from the light sources 272 and 292, the types of the light sources 272 and 292, and the positions where the light sources 272 and 292 are disposed.

Referring to FIG. 12, a plurality of patterns 252_1 are uniformly formed at predetermined intervals in the light guide plate 250_1 according to another embodiment of the present invention. In this case, the plurality of patterns 252_1 formed in the light guide plate 250_1 are formed in a double structure descending from the left side to the right side of the light guide plate 250_1.

Here, the size of the pattern 252_1 may be formed, for example, 0.1 ~ 0.5mm, the interval between the pattern 252_1 may be 0.3 ~ 0.6mm, the pitch between the pattern 252_1 is 0.2 ~ 0.4 may be mm. In this case, the size, spacing, and density of the pattern 252_1 may vary depending on the distance from the light sources 272 and 292, the types of the light sources 272 and 292, and the positions where the light sources 272 and 292 are disposed.

Referring to FIG. 13, a plurality of patterns 252_2 are uniformly formed at predetermined intervals in the light guide plate 250_2 according to another embodiment of the present invention. In this case, the plurality of patterns 252_2 formed in the light guide plate 250_2 are formed in a triple structure descending from the left side to the right side of the light guide plate 250_2.

Here, when the pattern 252_2 formed in the light guide plate 250_2 is viewed from above, as illustrated in FIG. 9A, the pattern 252_2 may have a quadrangular shape having a vertex, that is, a first point P11, at a central portion thereof. In this case, each of the points P11 to P15 represents the patterns 252_2, and the distance d3 between the second point P12 and the third point P13 and the third point P13 and the fifth point P15. The distance d4 between) may be 0.7 to 0.9 mm, and the distance d5 between the first point P11 and the fourth point P14 may be 0.3 to 0.5 mm.

In addition, when the pattern 252_2 formed in the light guide plate 250_2 is viewed from the side as shown in FIG. 9B, the bottom surfaces of the tetrahedron are bonded to each other, and the first point P11 and the sixth point P16 are formed. Height h1 between may be 0.15 ~ 0.17mm.

In another embodiment of the present invention, the pattern 252 formed on the light guide plates 250, 250_1 and 250_2 by forming patterns 252, 252_1 and 252_2 inside the light guide plates 250, 250_1 and 250_2, as in the exemplary embodiment of the present invention. , 252_1 and 252_2 may be prevented from occurring. Accordingly, it is possible to prevent the screen quality of the liquid crystal display from deteriorating.

In another embodiment of the present invention, the number of processes is reduced by forming patterns 252, 252_1 and 252_2 inside the light guide plates 250, 250_1 and 250_2 through one laser patterning process, thereby reducing manufacturing costs. Can be.

Many details are set forth in the foregoing description but should be construed as illustrative of preferred embodiments rather than to limit the scope of the invention. Therefore, the invention should not be defined by the described embodiments, but should be defined by the claims and their equivalents.

110: first liquid crystal panel 120: second liquid crystal panel
130: first optical sheets 140: second optical sheets
150, 250: Light guide plates 152, 252: Pattern
170, 190: backlight unit 172, 192: light source
174, 194: light source housing

Claims (13)

A first liquid crystal panel;
First optical sheets disposed under the first liquid crystal panel;
A light guide plate disposed under the first optical sheets to convert light incident from a light source into a planar light source, the plurality of patterns having a single structure, a double structure, or a triple structure therein;
Light sources disposed at both sides of the light guide plate;
Second optical sheets disposed under the light guide plate; And
And a second liquid crystal panel disposed under the second optical sheets. The method of claim 1,
And a pattern formed in the light guide plate by a green laser. The method of claim 1,
The pattern formed inside the light guide plate is a liquid crystal display device for a double-sided display, characterized in that formed in the shape of a dot (dot). The method of claim 1,
The plurality of patterns formed in the light guide plate are formed in a single structure going up from the left to the right while having a predetermined interval, the liquid crystal display device for a double-sided display. The method of claim 1,
The plurality of patterns formed in the light guide plate are formed in a dual structure going up from the left to the right while having a predetermined interval, the liquid crystal display device for a double-sided display. The method of claim 1,
The plurality of patterns formed in the light guide plate are formed in a triple structure going up from the left to the right while having a predetermined interval, the liquid crystal display device for a double-sided display. The method of claim 6,
When the pattern is viewed from above, the liquid crystal display device for a double-sided display, characterized in that the rectangular shape having a vertex in the center portion. The method of claim 6,
When the pattern is viewed from the side, the bottom surface of the tetrahedral liquid crystal display device, characterized in that it has a form that is bonded to each other. The method of claim 1,
The size of the pattern formed in the light guide plate is a liquid crystal display device for a dual-side display, characterized in that less than 0.5mm. The method of claim 1,
The size, the spacing, and the density of the pattern formed in the light guide plate vary depending on the distance from the light source, the type of light source, and the position where the light source is disposed. The method of claim 1,
The plurality of patterns formed in the light guide plate are formed in a single structure going down from the left to the right while having a predetermined interval, the liquid crystal display device for a double-sided display. The method of claim 1,
The plurality of patterns formed in the light guide plate are formed in a dual structure going down from the left to the right while having a predetermined interval, the liquid crystal display device for a double-sided display. The method of claim 1,
The plurality of patterns formed in the light guide plate are formed in a triple structure going down from the left to the right while having a predetermined interval, the liquid crystal display device for a double-sided display.
KR1020100139562A 2010-12-30 2010-12-30 Liquid crystal display device for dual display KR20120077564A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020100139562A KR20120077564A (en) 2010-12-30 2010-12-30 Liquid crystal display device for dual display

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020100139562A KR20120077564A (en) 2010-12-30 2010-12-30 Liquid crystal display device for dual display

Publications (1)

Publication Number Publication Date
KR20120077564A true KR20120077564A (en) 2012-07-10

Family

ID=46711024

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020100139562A KR20120077564A (en) 2010-12-30 2010-12-30 Liquid crystal display device for dual display

Country Status (1)

Country Link
KR (1) KR20120077564A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20170033478A (en) * 2015-09-16 2017-03-27 엘지디스플레이 주식회사 Double-sided Display Device and Backlight Unit therefor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20170033478A (en) * 2015-09-16 2017-03-27 엘지디스플레이 주식회사 Double-sided Display Device and Backlight Unit therefor

Similar Documents

Publication Publication Date Title
KR102395088B1 (en) Backlight unit and liquid crystal dispaly device including the same
KR101656742B1 (en) Liquid crystal display device
KR20100078298A (en) Backlight unit and liquid crystal display device module including the same
US20170127166A1 (en) Lighting device and display device
US20200089051A1 (en) Reflection sheet, lighting device and display device
US9684109B2 (en) Light guide plate, lighting device, display device, and television device
KR20160022225A (en) Light guide plate and display device having the same
KR101285635B1 (en) Light guide plate and liquid crystal display device module including the same
US20120133857A1 (en) Backlight Unit and Liquid Crystal Display Including the Same
JP2012151100A (en) Light guide plate, surface light source device, and transmission type image display device
JP5530655B2 (en) Display device
KR101787745B1 (en) Liquid Crystal Display device
KR20110103729A (en) Display apparatus
KR20120076973A (en) Light shielding tape and reflecting plate of flat panel display device
KR20110066776A (en) Backlight unit and liquid crystal display device having the same
KR20110045636A (en) Backlight unit and display apparatus thereof
KR102466453B1 (en) Display Device
KR102142482B1 (en) Optical sheet and liquid crystal display device moudle
KR20120077564A (en) Liquid crystal display device for dual display
KR20110041825A (en) Backlight unit and liquid crystal display device having the same
KR102088872B1 (en) Light source unit, backlgiht unit and liquid crystal display device the same
KR101843054B1 (en) Optical sheet and backlight unit having the same
KR102438261B1 (en) Display Device
KR20110035645A (en) Optical assembly, backlight unit and display apparatus thereof
KR20100028458A (en) Light guide plate and backlight unit for liquid crystal display device using the same

Legal Events

Date Code Title Description
A201 Request for examination
E902 Notification of reason for refusal
E601 Decision to refuse application