KR20130030441A - Liquid crystal display device - Google Patents

Liquid crystal display device Download PDF

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Publication number
KR20130030441A
KR20130030441A KR1020110093898A KR20110093898A KR20130030441A KR 20130030441 A KR20130030441 A KR 20130030441A KR 1020110093898 A KR1020110093898 A KR 1020110093898A KR 20110093898 A KR20110093898 A KR 20110093898A KR 20130030441 A KR20130030441 A KR 20130030441A
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KR
South Korea
Prior art keywords
light
guide plate
liquid crystal
light guide
ink layer
Prior art date
Application number
KR1020110093898A
Other languages
Korean (ko)
Inventor
안상현
Original Assignee
엘지디스플레이 주식회사
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Priority to KR1020110093898A priority Critical patent/KR20130030441A/en
Publication of KR20130030441A publication Critical patent/KR20130030441A/en

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/0006—Arrays
    • G02B3/0037—Arrays characterized by the distribution or form of lenses
    • G02B3/005—Arrays characterized by the distribution or form of lenses arranged along a single direction only, e.g. lenticular sheets
    • 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
    • G02B6/0035—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
    • G02B6/0036—2-D arrangement of prisms, protrusions, indentations or roughened 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
    • G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
    • G02B6/0073—Light emitting diode [LED]
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side

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

Abstract

PURPOSE: A liquid crystal display device is provided to prevent light leakage and to improve brightness and image quality. CONSTITUTION: A light guide plate(200) is formed in the upper part of a reflection plate(125). An ink layer(230) including a first and a second ink(230a,230b) is formed in the light guide plate. An LED assembly(129a,129b) is arranged along the light entry part of the light guide plate. An optical sheet(121) is formed on the light guide plate. A liquid crystal panel(110) is formed on the optical sheet.

Description

[0001] Liquid crystal display device [0002]

The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device capable of preventing light leakage and bright lines.

Liquid crystal display devices (LCDs), which are used for TVs and monitors due to their high contrast ratio and are advantageous for displaying moving images, are characterized by optical anisotropy and polarization of liquid crystals. The principle of image implementation by

Such a liquid crystal display is an essential component of a liquid crystal panel bonded through a liquid crystal layer between two side-by-side substrates, and realizes a difference in transmittance by changing an arrangement direction of liquid crystal molecules with an electric field in the liquid crystal panel. do.

However, since the liquid crystal panel does not have its own light emitting element, a separate light source is required to display the difference in transmittance as an image. To this end, a backlight having a light source is disposed on the back surface of the liquid crystal panel.

The backlight of the liquid crystal display device is classified into a direct type and an edge type according to the arrangement of the light sources. In the edge type, one or a pair of light sources includes one or two or two pairs of light guide plates. The light source has a structure in which both sides of the light guide plate are disposed, and the direct type has a structure in which several light sources are disposed below the liquid crystal panel.

At this time, the direct type has a limitation in light weight and thinning, so it is mainly used in a liquid crystal display device where brightness is more important than the thickness and weight of the screen, and the edge type which is lighter and thinner than the direct type is a notebook PC or a monitor. It is mainly used in liquid crystal display devices where thickness and weight are the same as PCs.

Recently, researches on light weight and thin liquid crystal displays have been actively conducted, and researches on edge type backlights have been actively conducted.

In addition, a liquid crystal display (LCD) has been proposed to provide a backlight scanning driving method for supplying light to a specific region of a liquid crystal panel by sequentially driving a plurality of light sources on / off for more vivid image representation.

As a result, the contrast ratio may be improved by making the bright image brighter or the dark image darker, thereby realizing a more vibrant image.

Therefore, in recent years, by forming a lenticular lens layer on the light guide plate to improve the linearity of the light incident into the light guide plate, the light guide plate can be divided into a plurality of areas, so that the light-weight, thin, and backlight scanning drive is possible. It provides a backlight.

In addition, recently, liquid crystal displays require a wide display area in addition to the light weight, thin, and backlight scanning driving, and implement a narrow bezel design of the outer edge, which is a non-light-emitting area except for an effective light-emitting area where an image is displayed. .

However, this narrow bezel design causes a problem of generating bright lines and light leakage of the liquid crystal display. As a result, the quality of the liquid crystal display device such as deterioration of brightness and image quality is deteriorated.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and a first object of the present invention is to provide a liquid crystal display device having a light weight, a thin shape, a narrow bezel design, and capable of driving a backlight scanning.

Through this, the second object is to improve the contrast ratio and reduce the power consumption of the backlight unit.

In addition, a third object is to improve luminance and image quality of the liquid crystal display by preventing bright lines and light leakage from occurring.

In order to achieve the object as described above, the present invention is a reflection plate; A light guide plate formed on an upper portion of the reflective plate and having an ink layer including a first ink layer absorbing light at an edge of a lower surface of the light incident part and a second ink layer protecting the first ink layer; An LED assembly arranged along the light incident portion of the light guide plate; An optical sheet seated on the light guide plate; And a liquid crystal panel mounted on the optical sheet.

In this case, the first ink layer includes carbon, or is made of one selected from black resin, graphite powder, gravure ink, black spray, and black enamel, and the second ink layer is a hard coating layer. Transparent or white.

The pattern may be intaglio, a lenticular lens layer having a peak and a valley repeated in a cross section, or a prism lens layer having rounded corners, or the pattern may be an elliptical pattern, a polygon pattern, One of the hologram pattern is selected.

In addition, a pattern is formed on one side of the ink layer on the lower surface of the light guide plate, and the pattern is an intaglio shape, and a lenticular lens layer having a peak and a valley repeated in a cross section.

In addition, a lenticular lens layer having a peak and a valley repeated in a cross section is formed on an upper surface of the light guide plate, and the optical sheet includes a diffusion sheet and a light collecting sheet.

Here, the support main covering the edge of the liquid crystal panel and the cover bottom is formed in close contact with the back of the support main, and the top cover is bound to the edge of the liquid crystal panel and assembled to the support main and cover bottom.

As described above, according to the present invention, by forming a lenticular lens layer on the upper surface of the light guide plate, the backlight scanning can be driven, and the backlight scanning can be driven even by using a lightweight thin edge type backlight unit. The contrast ratio can be improved by making the lighter or the darker the darker the image. Therefore, there is an effect that can implement a vivid image.

In particular, by forming an ink layer having a light absorption effect on the lower surface of the light incident portion of the light guide plate, there is an effect of preventing the occurrence of bright lines and light leakage phenomenon that the light incident portion is relatively bright compared to other portions.

Through this, there is an effect of improving the brightness and image quality of the liquid crystal display device.

In addition, the ink layer is formed of a first ink layer that substantially absorbs light and a second ink layer that protects the first ink layer, thereby reducing the friction between the ink layer and the reflective plate positioned below the light guide plate. There is an effect that can prevent the occurrence of foreign matter and damage.

1 is a cross-sectional view schematically showing a cross section of a modular liquid crystal display device according to an embodiment of the present invention.
Figure 2a is a perspective view schematically showing a light guide plate according to an embodiment of the present invention.
FIG. 2B is a bottom perspective view of FIG. 2A; FIG.

Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings.

1 is a schematic cross-sectional view of a modular liquid crystal display according to an exemplary embodiment of the present invention.

As illustrated, the liquid crystal display device includes a liquid crystal panel 110 and a backlight unit 120, and includes a top cover 140 and a support main 130 for modularizing the liquid crystal panel 110 and the backlight unit 120. ), And cover bottom 150.

Let's take a closer look at each of these.

First, the liquid crystal panel 110 plays a key role in image display of a liquid crystal display device. The liquid crystal panel 110 includes a first substrate 112 and a second substrate 114 which are bonded to each other and a liquid crystal layer (Not shown).

Although not shown in the drawing, a plurality of gate lines and data lines intersect each other on the inner surface of a first substrate 112 called a lower substrate or an array substrate, pixels are defined, and thin- and a thin film transistor (TFT), which are connected in a one-to-one correspondence with the transparent pixel electrodes formed in the respective pixels.

On the inner surface of the second substrate 114 called an upper substrate or a color filter substrate, color filters of red (R), green (G), and blue (B) And a black matrix for covering the gate lines, the data lines, and the thin film transistors.

In addition, color filters of red (R), green (G), and blue (B) colors and transparent common electrodes covering the black matrix are provided.

In addition, polarizing plates (not shown) for selectively transmitting only specific light are attached to outer surfaces of the first and second substrates 112 and 114, respectively.

When the thin film transistor selected for each gate line is turned on by the on / off signal of the gate driver circuit, the liquid crystal panel 110 transmits the signal voltage of the data driver circuit to the corresponding pixel electrode through the data line. The arrangement direction of the liquid crystal molecules of the liquid crystal layer is changed by the electric field between the pixel electrode and the common electrode, indicating a difference in transmittance.

In addition, the backlight unit 120 is provided to supply light to the rear surface of the liquid crystal panel 110 so that the difference in transmittance indicated by the liquid crystal panel 110 is expressed to the outside.

The backlight unit 120 includes first and second LED assemblies 129a and 129b, a white or silver reflector 125, a light guide plate 200 mounted on the reflector 125, and an optical intervening thereon. The sheet 121 is included.

The first and second LED assemblies 129a and 129b are disposed to face each other in both directions so as to face the first and second light receiving surfaces 201a and 201b of the light guide plate 200. In addition, the plurality of LEDs 127 includes a PCB 128 mounted at regular intervals.

In this case, the plurality of LEDs 127 emits white light toward the light incident surface of the light guide plate 200, including an LED chip (not shown) that emits all the colors of RGB or emits white light. In addition, the plurality of LEDs 127 emit light having a color of red (R), green (G), and blue (B), respectively, and by lighting the plurality of RGB LEDs 127 together, white light by color mixing is generated. It can also be implemented.

In particular, the first and second LED assemblies 129a and 129b may drive the respective LEDs 127 independently, and may be divided by each LED 127 to perform block division driving.

That is, the liquid crystal display of the present invention is defined by dividing the LED 127 into a plurality of along the longitudinal direction of the PCB 128 for a more vibrant image representation, each LED 127 is divided into a plurality of blocks Block division driving can be performed.

Accordingly, the first and second LED assemblies 129a and 129b of the present invention may implement a backlight scanning driving method of sequentially driving the respective LEDs 127 on and off.

Here, the backlight scanning driving is a driving method in which a block corresponding to the pixel is turned off while the pixel is responding, and the block is turned on after the response is completed. It goes out.

As such, the LEDs 127 are divided and the backlight scanning driving is performed through a defined block, so that only the light emitted for each block is supplied to the specific region of the liquid crystal panel 110 through the light guide plate 200, thereby providing a liquid crystal panel 110. ) Can improve the contrast ratio by making the brighter image brighter or darker the darker image, thereby creating a vivid image.

In addition, the brightness suitable for the image can be adjusted, so that the image having a dark brightness has light of dark brightness, thereby reducing the power consumption of the backlight unit 120.

The light guide plate 200 to which the light F emitted from the first and second LED assemblies 129a and 129b is incident enters the liquid crystal panel while the incident light F travels inside the light guide plate 200 by a plurality of total reflections. The surface of the light guide plate 200 corresponding to the specific region of the light emitting plate 200 is evenly spread to provide the surface light source to the liquid crystal panel 110.

At this time, the light guide plate 200 of the present invention, when the first and second LED assembly (129a, 129b) driving the backlight scanning for each LED 127, the light (F) incident inside the light guide plate 200 is a light guide plate In order not to overlap each other in the inside of the 200, the lenticular lens layer 210 is formed on the upper surface of the light guide plate 200.

That is, the light F incident into the light guide plate 200 from the first and second LED assemblies 129a and 129b through the lenticular lens layer 210 is improved in linearity, so that the light guide plate 200 is divided into a plurality of regions. Partitioning can be defined.

Therefore, only the light F emitted for each LED 127 may supply the light F to a specific region of the liquid crystal panel 110 through the divided region of the light guide plate 200.

The light guide plate 200 of the present invention is characterized in that the ink layer 230 is formed along the edges of the lower surfaces close to the light receiving surfaces 201a and 201b. As a result, light leakage and bright lines may be prevented from occurring at the light incident part of the light guide plate 200 in which the first and second LED assemblies 129a and 129b face the light receiving surfaces 201a and 201b.

We will discuss this in more detail later.

The reflection plate 125 is positioned on the rear surface of the light guide plate 200 to improve luminance by reflecting light F passing through the rear surface of the light guide plate 200 toward the liquid crystal panel 110.

The optical sheet 121 on the light guide plate 200 includes a diffusion sheet and at least one light collecting sheet, and diffuses or condenses the light F passing through the light guide plate 200 to make the liquid crystal panel 110 more uniform. Let the surface light source enter.

The liquid crystal panel 110 and the backlight unit 120 are modularized through the top cover 140, the support main 130, and the cover bottom 150. The top cover 140 is the top and side surfaces of the liquid crystal panel 110. A rectangular frame having a cross section bent in a shape of “a” so as to cover an edge thereof is configured to open an entire surface of the top cover 140 to display an image implemented in the liquid crystal panel 110.

In addition, the cover bottom 150, on which the liquid crystal panel 110 and the backlight unit 120 are mounted, is the basis for assembling the entire apparatus of the liquid crystal display, and includes a bottom surface that is in close contact with the rear surface of the backlight unit 120.

The support main body 130, which is mounted on the cover bottom 150 and surrounds the edges of the liquid crystal panel 110 and the backlight unit 120, is coupled to the top cover 140 and the cover bottom 150. .

Here, the top cover 140 may be referred to as a case top or a top case, the support main 130 may be referred to as a guide panel or a main support, and a mold frame, and the cover bottom 150 may be referred to as a bottom cover.

As described above, the liquid crystal display device of the present invention is a liquid crystal display device capable of driving backlight scanning by driving a plurality of LEDs 127 of the first and second LED assemblies 129a and 129b, respectively. Image representation can be implemented.

In addition, power consumption of the backlight unit 120 may be reduced.

In particular, light leakage and bright lines may be prevented from occurring in the light incident portion of the light guide plate 200 by the ink layer 230 formed along the lower edge of the light incident portion of the light guide plate 200.

2A is a perspective view schematically illustrating a light guide plate according to an embodiment of the present invention, and FIG. 2B is a bottom perspective view of FIG. 2A.

As shown in the drawing, the light guide plate 200 may be made of a plastic material such as polymethylmethacrylate (PMMA) or polycarbonate (PC), which is one of acrylic transparent resins, which is one of transparent materials capable of transmitting light, PMMA is widely used because it has excellent transparency, weatherability and colorability, and induces light diffusion when light is transmitted.

The light guide plate 200 may include a first light incident surface 201a corresponding to the first LED assembly 129a of FIG. 1 and a second light incident surface corresponding to the second LED assembly 129b of FIG. 201b) and the first and second light receiving surfaces 201a and 201b, and the upper surface 201c from which light is emitted and the lower surface 201d facing the reflector plate 125 in FIG. 1 and both sides facing each other ( 201e, 201f).

In addition, a plurality of lenticulars are arranged on the upper surface 201c of the light guide plate 200 along the first and second light incident surfaces 201a and 201b of the light guide plate 200 so that peaks and valleys are repeated in the cross section. The lenses 211 protrude from the upper surface 201c to form the lenticular lens layer 210. At this time, each lenticular lens 211 has a hemispherical or semi-elliptical cross section.

Therefore, the light incident into the light guide plate 200 has a high straightness by the lenticular lens layer 210.

In this case, when the ratio of the thickness d of the light guide plate 200 and the height h of the lenticular lens layer 210 is 1: 0.01, the linearity of the light traveling in the light guide plate 200 is the highest.

As such, since the linearity of light incident into the light guide plate 200 by the lenticular lens layer 210 is improved, the light guide plate 200 may be divided and defined for each lenticular lens 211.

As a result, in the process of dividing and driving the plurality of LEDs (127 of FIG. 1) of the LED assemblies 129a and 129b, the liquid crystal panel (110 of FIG. 1) is provided through the lenticular lens layer 210 of the light guide plate 200. Light can be supplied only to specific areas of the

In addition, an intaglio lenticular lens layer 220 may be further formed on the lower surface 201d of the light guide plate 200 to supply a uniform surface light source corresponding to a specific region of the liquid crystal panel 110 of FIG. 1. .

In this case, the intaglio lenticular lens layer 220 formed on the bottom surface 201d of the light guide plate 200 may have both side surfaces 201e and 201f facing each other of the light guide plate 200 on the bottom surface 201d of the light guide plate 200. By arranging adjacently along the direction transverse to), a mountain and a valley are repeatedly formed in the cross section.

That is, the lenticular lens layer 210 formed on the upper surface 201c of the light guide plate 200 and the intaglio lenticular lens layer 220 formed on the lower surface 201d are formed so as to vertically cross each other. .

In particular, the light guide plate 200 of the present invention is characterized in that the ink layer 230 is formed along the longitudinal direction on the lower surface 201d of the light incident portion corresponding to the first and second light incident surfaces 201a and 201b. .

Here, the ink layer 230 may be divided into a first ink layer 230a and a second ink layer 230b. The first ink layer 230a substantially absorbs light, and thus light In order to maximize the absorption effect, a black-colored material that absorbs light well, for example, contains carbon or black colored black resin, graphite powder, gravure ink, black spray, black enamel, etc. It is preferable to make.

In addition, the second ink layer 230b serves to protect the first ink layer 230a, that is, the second ink layer 230b has a hard coating for preventing damage of the first ink layer 230a. coating) layer.

Therefore, the second ink layer 230b is freed of foreign matter by friction between the first ink layer 230a, which substantially absorbs light, and the reflecting plate (125 in FIG. 1) located on the rear surface of the light guide plate 200. Occurrence or damage to the first ink layer 230a.

Here, the second ink layer 230b is transparent or white, and the overall color of the ink layer 230 is black or gray with high light absorption effect.

By the ink layer 230, the light guide plate 200 according to the present invention has a bright line and light leakage phenomenon in which the light incident portion where the first and second LED assemblies (129a and 129b of FIG. 1) are positioned is relatively brighter than other portions. This can be prevented from occurring.

That is, the light guide plate 200 may have a light leakage phenomenon in which the light incident part where the first and second LED assemblies (129a and 129b of FIG. 1) are positioned is visually brighter than other parts, or the first and second LED assemblies are positioned. In the process of the light emitted from the LED assembly (129a and 129b of FIG. 1) being incident into the light guide plate 200 through the first and second light receiving surfaces 201a and 201b of the light guide plate 200, some light is emitted from the light guide plate ( Scattered lines are generated by scattering and diffusing the upper and lower edge portions of the first and second light receiving surfaces 201a and 201b of the 200.

In particular, since the light hitting the edges of the lower end portions of the first and second light receiving surfaces 201a and 201b of the light guide plate 200 is generated as bright lines of strong level, strong bright lines are observed in the light incident portion of the light guide plate 200.

Accordingly, the light guide plate 200 of the present invention forms the ink layer 230 made of a black or gray material on the lower surface 201d of the light incident portion, thereby lowering the saturation of the light incident portion by the ink layer 230. As a result, the light leakage phenomenon in which the light incident part visually appears relatively brighter than other parts is prevented from occurring.

In addition, the light guide plate absorbs light scattered and diffused through corner portions of the first and second light receiving surfaces 201a and 201b of the light guide plate 200 through the first ink layer 230a of the ink layer 230. A bright line can be prevented from occurring at the light incident part of the 123.

Accordingly, the liquid crystal display of the present invention prevents light leakage and bright lines from occurring at the light incident portion of the light guide plate 200, thereby preventing the quality of the liquid crystal display, such as deterioration of brightness and image quality, from being degraded. .

In this case, the width w of the ink layer 230 may be appropriately formed in consideration of the size and light absorption level of the light guide plate 200 within a range not affecting the active region where the image of the light guide plate 200 is implemented. desirable.

In this case, the ink layer 230 may be formed to overlap with the intaglio lenticular lens layer 220 formed on the bottom surface 201d of the light guide plate 200, but the intaglio lenticular lens layer 220 and the ink may be formed. It is desirable to prevent the layers 230 from overlapping each other.

To this end, the intaglio lenticular lens layer 220 formed on the lower surface 201d of the light guide plate 200 is formed to be spaced apart from the first and second light incident surfaces 201a and 201b by a predetermined distance, thereby guiding the light guide plate 200. It is preferable to provide a region where the ink layer 230 is to be formed along the edge of the bottom surface 201d of the light incident portion of the light emitting portion.

As described above, the liquid crystal display of the present invention forms an ink layer 230 having a light absorption effect on the lower surface 201d of the light incident portion of the light guide plate 200, whereby the light incident portion is relatively brighter than other portions. Visible bright lines and light leakage are prevented from occurring.

In this case, the ink layer 230 is formed of a first ink layer 230a that substantially absorbs light and a second ink layer 230b that protects the first ink layer 230a. The foreign material 230 may be prevented from being generated and damaged by friction with the reflective plate (125 of FIG. 1) positioned below the light guide plate 200.

Meanwhile, in the above description, the present invention uses the light guide plate 200 in which the lenticular lens layer 210 is formed on the upper surface 201c, but the flat shape or the upper portion in which the lenticular lens layer 210 is not formed. The configuration of the light guide plate 200 having a specific inclination on the surface 201c or the lower surface 201d is also applicable.

In addition to the intaglio lenticular lens layer 220, the intaglio prism lens layer may be formed on the lower surface 201d of the light guide plate 200. In this case, the prism lens layer is also formed by repeated peaks and valleys. The peak of the prism lens layer may have a sharp edge or may be rounded to have a radius of curvature.

In addition to the lens layer, an elliptical pattern, a polygonal pattern, a hologram pattern, or the like may be formed.

In addition, although the LED assembly (129a, 129b of FIG. 1), which is a light source of the backlight unit (120 of FIG. 1), is positioned to both sides of the light guide plate 200, the liquid crystal display of the present invention is an LED assembly (FIG. The configuration in which 129a and 129b of 1 are located only on one side of the light guide plate 200 is also applicable.

Then, any one of the top cover (140 in FIG. 1), the support main (130 in FIG. 1), and cover cover (150 in FIG. 1) for modularizing the liquid crystal panel (110 in FIG. 1) and the backlight unit (120 in FIG. 1). One can be eliminated to realize the lightweight, thin and narrow bezels that are being demanded recently.

The present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit of the present invention.

110: liquid crystal panel (112: first substrate, 114: second substrate)
119a and 119b: first and second polarizing plates
121: optical sheet, 125: reflector
129a, 129b: first and second LED assemblies (127: LED, 128: PCB)
130: support main, 140: top cover, 150: cover bottom
200: light guide plate, 201a, 201b: first and second light receiving surface, 210: lenticular lens layer,
220: engraved lenticular lens layer
230: ink layers 230a, 230b: first and second ink layers

Claims (9)

A reflector;
A light guide plate formed on an upper portion of the reflective plate and having an ink layer including a first ink layer absorbing light at an edge of a lower surface of the light incident part and a second ink layer protecting the first ink layer;
An LED assembly arranged along the light incident portion of the light guide plate;
An optical sheet that is seated on the light guide plate;
And a liquid crystal panel
Liquid crystal display comprising a.
The method of claim 1,
The first ink layer includes carbon, or a liquid crystal display device comprising one selected from black resin, graphite powder, gravure ink, black spray, and black enamel.
The method of claim 1,
The second ink layer is a hard coating layer, which is transparent or white.
The method of claim 1,
And a pattern formed on one side of the ink layer on the lower surface of the light guide plate.
The method of claim 4, wherein
The pattern is an intaglio shape, and the liquid crystal display device is a lenticular lens layer having a peak and a valley repeated in cross section or a prism lens layer having rounded corners.
The method of claim 4, wherein
Wherein the pattern is one selected from an elliptical pattern, a polygonal pattern, and a hologram pattern.
The method of claim 1,
And a lenticular lens layer having a peak and a valley repeated in a cross section on an upper surface of the light guide plate.
The method of claim 1,
The optical sheet includes a diffusion sheet and a light collecting sheet.
The method of claim 1,
And a cover cover configured to be in close contact with the support main covering the edge of the liquid crystal panel, and a cover bottom formed in close contact with the rear surface of the support main, and a top cover bordering the edge of the liquid crystal panel and assembled to the support main and the cover bottom.
KR1020110093898A 2011-09-19 2011-09-19 Liquid crystal display device KR20130030441A (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101444596B1 (en) * 2013-04-25 2014-10-01 전북대학교산학협력단 Graphene-Graphite Optical Modulator
KR20150062857A (en) * 2013-11-29 2015-06-08 엘지디스플레이 주식회사 Light guide plate having partially wedge portion and liquid cyrstal display device having thereof
KR101586795B1 (en) * 2014-08-18 2016-01-20 희성전자 주식회사 Curved Display Apparatus
KR20160135896A (en) * 2015-05-18 2016-11-29 삼성디스플레이 주식회사 Display device
CN106502030A (en) * 2015-09-07 2017-03-15 江苏清投视讯科技有限公司 A kind of light leakage rear projection display
CN107102398A (en) * 2017-05-27 2017-08-29 厦门天马微电子有限公司 Backlight module and display panel

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101444596B1 (en) * 2013-04-25 2014-10-01 전북대학교산학협력단 Graphene-Graphite Optical Modulator
WO2014175587A1 (en) * 2013-04-25 2014-10-30 전북대학교 산학협력단 Graphene-graphite optical modulator
KR20150062857A (en) * 2013-11-29 2015-06-08 엘지디스플레이 주식회사 Light guide plate having partially wedge portion and liquid cyrstal display device having thereof
KR101586795B1 (en) * 2014-08-18 2016-01-20 희성전자 주식회사 Curved Display Apparatus
KR20160135896A (en) * 2015-05-18 2016-11-29 삼성디스플레이 주식회사 Display device
CN106502030A (en) * 2015-09-07 2017-03-15 江苏清投视讯科技有限公司 A kind of light leakage rear projection display
CN107102398A (en) * 2017-05-27 2017-08-29 厦门天马微电子有限公司 Backlight module and display panel

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