KR20130003937A - Liquid crystal display device - Google Patents

Liquid crystal display device Download PDF

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Publication number
KR20130003937A
KR20130003937A KR1020110065592A KR20110065592A KR20130003937A KR 20130003937 A KR20130003937 A KR 20130003937A KR 1020110065592 A KR1020110065592 A KR 1020110065592A KR 20110065592 A KR20110065592 A KR 20110065592A KR 20130003937 A KR20130003937 A KR 20130003937A
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KR
South Korea
Prior art keywords
liquid crystal
light
leds
guiding means
light guiding
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Application number
KR1020110065592A
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Korean (ko)
Inventor
이동석
김병구
Original Assignee
엘지디스플레이 주식회사
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Priority to KR1020110065592A priority Critical patent/KR20130003937A/en
Publication of KR20130003937A publication Critical patent/KR20130003937A/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
    • G02B6/0023—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
    • G02B6/0065—Manufacturing aspects; Material aspects
    • 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
    • G02F1/133553—Reflecting elements
    • 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
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • 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
    • G02F1/133602—Direct backlight
    • G02F1/133611—Direct backlight including means for improving the brightness uniformity
    • 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)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Liquid Crystal (AREA)
  • Planar Illumination Modules (AREA)

Abstract

PURPOSE: A liquid crystal display is provided to use an LED assembly as a light guiding unit, to minimize the difference of the refractive index of a boundary surface and to transmit the light of LEDs to the light guiding unit without reflection. CONSTITUTION: A backlight unit(120) includes a reflecting plate(125), an LED assembly, a light guide unit(123) and optical sheets(121). The LED assembly is arranged along the center line of the inside of the backlight unit. The light guiding unit is located in the upper part of the reflecting plate. The optical sheets are located in the upper part of the light guiding unit. A cover bottom(150) is combined with the rear side of the backlight unit. The lower part of the light guiding unit includes a horizontal portion(123a), a first and a second inclined portion(123b,123c).

Description

[0001] LIQUID CRYSTAL DISPLAY DEVICE [0002]

The present invention relates to a liquid crystal display device capable of minimizing light loss to provide high luminance light and reducing the width of a bezel.

In general, a liquid crystal display device is driven by using the optical anisotropy and polarization properties of liquid crystals. The liquid crystal molecules have a directional structure because the structure is thin and long, and artificially applies an electric field to the liquid crystals. You can control the direction of the molecular array.

That is, when the arrangement of the liquid crystal molecules is changed using an electric field, light may be refracted in the arrangement direction of the liquid crystal molecules due to optical anisotropy of the liquid crystal, thereby displaying an image.

Such a liquid crystal display includes an array substrate manufacturing process for forming a gate wiring, a data wiring, a thin film transistor (TFT), and a pixel electrode on an array substrate, and forming a black matrix, a color filter, and a common electrode on the color filter substrate. A cell process of forming a unit panel by combining a color filter substrate manufacturing process, an array substrate and a color filter substrate, cutting each cell unit, and injecting liquid crystal between the cell unit array substrate and the color filter substrate; It is completed through a module process of attaching a driving IC and a printed circuit board (PCB) to a unit panel and assembling with a backlight unit.

In particular, the backlight unit is required because the liquid crystal molecules of the liquid crystal display do not emit light. The backlight unit includes a light source, and is classified into a direct type and an edge type according to the position of the light source. do.

As a light source, fluorescent lamps such as Cold Cathode Fluorescent Lamps (CCFLs) and External Electrode Fluorescent Lamps (EEFLs) have been widely used, but according to the trend toward thinner and lighter liquid crystal displays, power consumption has recently been reduced. Light Emitting Diodes (LEDs), which have advantages in terms of weight, brightness, and the like, are replacing fluorescent lamps.

The direct type backlight unit is a method of directly supplying the light emitted from the lamp or the light emitting diode to the liquid crystal panel by arranging a plurality of lamps or light emitting diodes under the liquid crystal panel, and the side type backlight unit arranges a light guide plate under the liquid crystal panel. By disposing a lamp or a light emitting diode on at least one side of the light guide plate, the light emitted from the lamp or the light emitting diode is indirectly supplied to the liquid crystal panel by using the refraction and reflection of the light guide plate.

Here, the side type backlight unit is easier to manufacture than the direct type backlight unit, and has been used a lot because of the light weight and low power consumption.

1 is a cross-sectional view of a conventional side type liquid crystal display module.

As shown in FIG. 1, the liquid crystal display module includes a liquid crystal panel 10 including first and second substrates 12 and 14 and a backlight unit 20 positioned behind the liquid crystal panel 10.

The liquid crystal panel 10 and the backlight unit 20 are modularized through the top cover 40, the support main 30, and the cover bottom 50.

The liquid crystal panel 10 plays a key role in image expression. First and second polarizing plates selectively transmit only specific light to the outer surfaces of the first and second substrates 12 and 14. 19a and 19b are attached, respectively.

The backlight unit 20 includes an LED assembly 29 disposed on one side of the cover bottom 50, a reflecting plate 25 seated on the cover bottom 50, and a light guide plate 23 positioned above the reflecting plate 25. ) And a plurality of optical sheets 21 interposed on the light guide plate 23.

The LED assembly 29 is formed by mounting each of the plurality of LEDs 29a on the LED printed circuit board 29c. Each of the plurality of LEDs 29a is bonded to face the light incident part 23a of the light guide plate 23. The pad 70 is disposed on one side of the cover bottom 50.

As the LED assembly 29 is disposed on one side of the cover bottom 50 as described above, a first gap A exists between one side of the cover bottom 50 and the light receiving part 23a of the light guide plate 23. .

The first interval A is the LED assembly 29, that is, the first thickness A1 of the LED printed circuit board 29c and the second thickness A2 of the LED 29a, the LED assembly 29 and the light guide plate (A). Corresponds to the length of the second interval A3 between the light incidence portions 23a of 23). Here, the first interval A may further include a thickness of the adhesive pad 70 attached to the rear surface of the LED assembly 29.

Meanwhile, the light emitted from each of the plurality of LEDs 29a of the LED assembly 29 is not supplied to the light incident part 23a of the light guide plate 23 by the second interval A3, and some light is lost. There is a problem.

In more detail, since the refractive index of the light guide plate 23 is 1.49 and the refractive index of air is 1, the light emitted from each of the plurality of LEDs 29a passes through the air to the light incident part 23a of the light guide plate 23. When the incident light is reflected by the light incidence portion 23a of the light guide plate 23 due to the difference in refractive index, some light is lost and the light incidence efficiency is reduced.

In addition, the liquid crystal display device has recently been used in a wide range of applications, such as portable computers, desktop computer monitors, and wall-mounted televisions, and has a wide display area and a narrow bezel width L. There is an active research on.

However, there is a limit in reducing the width L of the bezel due to the first gap A required as the LED assembly 29 is disposed on one side of the cover bottom 50.

Accordingly, an object of the present invention is to provide a liquid crystal display that can reduce the width of the bezel while maximizing the light incident efficiency of light emitted from each of the plurality of LEDs.

In order to achieve the above object, a liquid crystal display device according to a first embodiment of the present invention, a liquid crystal panel; Located on the rear of the liquid crystal panel including a reflector plate, LED assembly disposed along the inner center line, including a light guiding means positioned above the reflecting plate, and a plurality of optical sheets positioned above the light guiding means. A backlight unit; A cover bottom coupled and fastened at a rear surface of the backlight unit, and a lower portion of the light guide means includes a horizontal portion at which the LED assembly is positioned upward, and first and second slopes upwardly to the left and right outer sides of the horizontal portion; It consists of a slope.

The LED assembly is characterized in that each of the plurality of first LED and the plurality of second LED is mounted on both sides of the printed circuit board.

The printed circuit board may include a first surface on which the plurality of first LEDs emitting light in a first side direction is mounted, and a second side direction corresponding to the first side in a direction opposite to the first side direction. Characterized in that it corresponds to a double-sided printed circuit board including a second surface on which the plurality of second LED for emitting light is mounted.

Alternatively, the printed circuit board may include a first printed circuit board on which the plurality of first LEDs emitting light in a first side direction are mounted, and a second side surface corresponding to the first side in a direction opposite to the first side direction. A rear surface of the second printed circuit board on which the plurality of second LEDs emitting light in a direction is mounted is bonded to each other.

In this case, each of the plurality of first LEDs and each of the plurality of second LEDs may be mounted so that their centers are positioned on the same line or alternately mounted.

The reflector is characterized in that the pattern is formed to uniformly spread the light emitted from each of the plurality of LEDs.

In addition, at least one support pad may be provided between the cover bottom and the reflector to closely contact the reflector to each of the first and second inclined portions of the light guide plate.

The cover bottom may include a central portion corresponding to the horizontal portion, a first support portion corresponding to the first slope portion, and a second support portion corresponding to the second slope portion.

The light guiding means is formed of a UV cured resin.

The refractive index of the light guiding means is 1.46, and the refractive index of each of the plurality of first and second LEDs is 1.42.

According to a second preferred embodiment of the present invention, a liquid crystal display device includes: a liquid crystal panel; A light guide unit including a reflector plate, an LED assembly including a plurality of LEDs inside the first side, and including a plurality of optical sheets positioned above the light guide unit; A backlight unit positioned on the rear surface; And a cover bottom coupled and fastened at a rear surface of the backlight unit, wherein the light guiding means includes the first side on which the LED assembly is located and a second side facing the first side, and at the first side. It characterized in that the wedge shape having a slope in the lower portion becomes thinner toward the second side.

The reflective plate is characterized in that the pattern is formed to reflect the light passing through the light guide means toward the liquid crystal panel.

A support pad may be provided between the cover bottom and the reflective plate to closely adhere the reflective plate to the light guide plate.

The cover bottom is characterized in that it comprises the inclined upper portion from the one corresponding to the first side toward the end corresponding to the second side.

In the liquid crystal display according to the present invention, the LED assembly is included in the light guiding means to minimize the difference in refractive index at the interface so that the light emitted from the plurality of LEDs can be incident into the light guiding means without being reflected, thereby improving the light incident efficiency of the light. Increase.

In particular, by disposing the LED assembly in the center of the light guiding means, it is possible to implement a liquid crystal display device having a narrow bezel by eliminating the necessary gap as the conventional LED assembly is located at one edge of the liquid crystal display device.

In addition, by forming a pattern on the reflecting plate instead of the rear surface of the light guide plate having high manufacturing cost, the manufacturing cost of the liquid crystal display device can be reduced.

In addition, the LED assembly can be fixed without the adhesive pad required for fixing and fixing the conventional LED assembly, thereby reducing the cost and time of components and assembly process.

1 is a cross-sectional view of a conventional side type liquid crystal display module.
2 is a cross-sectional view showing a liquid crystal display module according to a first embodiment of the present invention.
3 is a cross-sectional view showing a liquid crystal display module according to a second embodiment of the present invention.
4 is a cross-sectional view showing a liquid crystal display module according to a third embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

2 is a cross-sectional view showing a liquid crystal display module according to a first embodiment of the present invention.

As shown in FIG. 2, the liquid crystal display device module 100 includes a liquid crystal panel 110, a backlight unit 120, and a support main 130 for modularizing the liquid crystal panel 110 and the backlight unit 120. ) And a cover bottom 150 and a top cover 140.

The liquid crystal panel 110 is a part that plays a key role in image display and is composed of a first substrate 112 and a second substrate 114 which are bonded to each other with a liquid crystal layer interposed therebetween.

Although not shown in the drawings, a plurality of gate lines and data lines intersect on the inner surface of the first substrate 112, which is commonly referred to as a lower substrate or an array substrate, under the premise of an active matrix scheme, and pixels are defined at each intersection. A thin film transistor (TFT) is provided to correspond one-to-one with a transparent pixel electrode formed in each pixel.

In addition, the inner surface of the second substrate 114 called the upper substrate or the color substrate may correspond to each pixel, for example, a color filter of red (R), green (G), and blue (B) color and each of them. A black matrix covering the non-display elements such as gate lines, data lines, and thin film transistors is provided.

In addition, polarizing plates 119a and 119b for selectively transmitting only specific light are attached to the outer surfaces of the first and second substrates 112 and 114, respectively.

In addition, a printed circuit board (not shown) is connected along at least one edge of the liquid crystal panel 110 through a connecting member (not shown) such as a flexible circuit board or a tape carrier package (TCP). During the modularization process, the support main 130 is properly folded and adhered to the rear surface or the cover bottom 150.

When the thin film transistor selected for each gate line is turned on by the on or off signal of the gate driving circuit transmitted through the printed circuit board (not shown), the liquid crystal panel 110 having the above- The signal voltage of the liquid crystal molecules is transmitted to the corresponding pixel electrode through the data line and the alignment direction of the liquid crystal molecules is changed by the electric field between the pixel electrode and the common electrode.

On the rear surface of the liquid crystal panel 110, a backlight unit 120 is provided to supply light so that the difference in transmittance can be displayed as an image.

The backlight unit 120 includes a light guiding means 123 including an LED assembly 129 corresponding to a light source, a reflecting plate 125 positioned behind the light guiding means 123, and an upper portion of the light guiding means 123. It includes a plurality of interposed optical sheets 121.

The light guiding means 123 serves to guide light emitted from the LED assembly 129 provided therein to be a higher quality surface light source.

The lower portion of the light guiding means 123 for this purpose is a flat horizontal portion 123a of the center corresponding to the center line in the horizontal direction or the vertical direction, and the first and second inclined upward toward the left and right outer sides thereof. It is characterized by consisting of the inclined portion (123b, 123c).

Here, the LED assembly 129 is positioned on the upper portion of the horizontal portion 123a, the center of which is thickest, and the first and second inclined portions 123b and 123c in the horizontal portion 123a where the LED assembly 129 is positioned. The thickness becomes thinner toward both ends of the).

Light is refracted toward the liquid crystal panel 110 by the patterns of the first and second inclined portions 123b and 123c and the reflecting plate 125 to be described later, thereby increasing the light efficiency of the light guiding means 123.

At this time, the first and second inclined portions 123b and 123c are symmetrical with respect to the horizontal portion 123a, and as the inclination angles of the first and second inclined portions 123b and 123c become larger within a predetermined range. The amount of light supplied to the liquid crystal panel 110 through the light guiding means 123 is increased.

Meanwhile, the LED assembly 129 included in the light guiding means 123 may include an LED printed circuit board (PCB) in a state in which each of the plurality of first and second LEDs 129a and 129b is spaced at a predetermined interval. 129c), and a plurality of first and second LEDs 129a and 129b are mounted on both sides of the LED printed circuit board 129c, so that light is emitted in both side directions based on the LED printed circuit board 129c. Will be emitted.

In this case, the LED printed circuit board 129c includes a double-sided printed circuit board or a rear surface of which a circuit pattern is formed on both the first and second surfaces thereof so that the first and second LEDs are exposed to the outside. It may correspond to a circuit board.

In this case, the plurality of first and second LEDs 129a and 129b are mounted on the first surface based on the LED printed circuit board 129c and each of the plurality of first LEDs 129a emitting light in a first side direction. The centers of the plurality of second LEDs 129b mounted on two surfaces and emitting light in the second side direction may be mounted on the same line.

Alternatively, the plurality of first and second LEDs 129a and 129b may be mounted on the first surface based on the LED printed circuit board 129c and each of the plurality of first LEDs 129a emitting light in a first side direction. Each of the plurality of second LEDs 129b mounted on two surfaces and emitting light in a second side direction may be mounted to cross each other.

Here, the LED printed circuit board 129c is a metal core printed circuit board having a heat dissipation function for dissipating heat generated from each of the first and second LEDs 129a and 129b to the outside. May correspond to.

The light guiding means 123 is made of a UV (ultraviolet) cured resin having a refractive index of about 1.46, not a polymethyl methacrylate (PMMA) generally applied.

The light guiding means 123 is filled by injecting UV (ultraviolet) curing resin in the state where the LED assembly 129 is disposed on the center line of the light guiding means frame having a shape corresponding thereto, and irradiating UV (ultraviolet) It can be produced by curing the resin.

The light guiding means 123 manufactured as described above refracts and reflects light in the first and second side directions emitted from the plurality of first and second LEDs 129a and 129b included in the inner center thereof so that the light is guided by the light guiding means ( Providing the surface light source to the liquid crystal panel 110 by spreading the light evenly over a wide area of the light guiding means 123 while the inside 123 is moved.

In particular, the refractive index of the UV cured resin used to fabricate the light guiding means 123 is approximately 1.46, and the refractive index of the resin used to fabricate each of the plurality of first and second LEDs 129a and 129b is approximately 1.42. Therefore, as the light emitted from each of the plurality of first and second LEDs 129a and 129b is incident on the light guiding means 123 without loss, the light incident efficiency is increased to increase the light efficiency.

In addition, since the LED assembly 129 is included inside the light guide unit 123 and above the horizontal portion 123a, a separate space for disposing the LED assembly 129 is unnecessary.

For this reason, conventionally, as the LED assembly (29 in FIG. 1) is disposed on one side of the cover bottom (50 in FIG. 1), a first interval (A in FIG. 1) is required and such first interval (in FIG. 1). Although the width of the bezel including A) (L in FIG. 1) was required, in the present invention, the first interval A is not necessary, thereby reducing the width of the bezel narrower by the first interval A. It is possible to implement a liquid crystal display having a.

The reflecting plate 125 is positioned on the rear surface of the light guiding means 123 to reflect the light passing through the rear surface of the light guiding means 123 toward the liquid crystal panel 110 to improve the brightness of the light.

The reflective plate 125 has a cross-sectional shape in which two edges are bent upwardly and obliquely along the rear shape of the light guiding means 123 during the modularization process, and thus is in close contact with the light guiding means 123.

The reflection plate 125 is characterized in that it comprises a pattern of a specific shape to inject light passing through the rear surface of the light guide means 123 toward the liquid crystal panel 110 and to spread the light uniformly.

The pattern may be configured in various ways such as an elliptical pattern, a polygonal pattern, a hologram pattern, and the like to guide the light incident into the reflector 125. By adjusting the density, a more uniform surface light source may be supplied to the liquid crystal panel 110.

Accordingly, the light passing through the light guiding means 123 is reflected toward the liquid crystal panel 110 by the pattern formed on the reflecting plate 125 and the light efficiency is increased.

As such, by forming the pattern on the reflector plate 125, it is not necessary to form the pattern on the back surface of the light guide means 123 having a high manufacturing cost, thereby reducing the manufacturing cost.

Meanwhile, the plurality of optical sheets 121 interposed on the light guide means 123 include a diffusion sheet, one or more prism sheets, a protective sheet, and the like, and diffuse or condense the light passing through the light guide means 123. A more uniform surface light source is incident on the liquid crystal panel 110.

As described above, the liquid crystal panel 110 and the backlight unit 120 are modularized through the support main 130, the top cover 140, and the cover bottom 150, and the top cover 140 is the liquid crystal panel 110. The front surface is opened in the shape of a rectangular frame whose cross section is bent in a-shape so as to cover a front edge of the front surface and a part of the side surface of the support main 130 so that an image implemented in the liquid crystal panel 110 is displayed.

The support main 130 extends from side portions and side portions surrounding the edges of the liquid crystal panel 110 and the cover bottom 150 to support the liquid crystal panel 110 while covering the rear edges of the liquid crystal panel 110 and the backlight is provided. It consists of a protrusion that wraps around the front edge of the unit 120.

In addition, the cover bottom 150 on which the backlight unit 120 is seated and serves as the base of the entire structure of the liquid crystal display device module 100 is formed in a rectangular plate shape and has four side surfaces formed by vertically bending the four edges thereof. Include.

Here, the support pad 190 is positioned between the cover bottom 150 and the backlight unit 120 during the modularization process, and the support pad 190 is positioned at the rear surface of the reflector plate 125 and is positioned at the center of the LED. The backlight unit 120 and the cover by the shape of the light guiding means 123 having the first and second inclined portions 123b and 123c inclined upwardly toward the outside of the left and right centers of the assembly 129. The reflector plate 125 serves to closely contact the light guide means 123 while filling the space generated between the bottoms 150.

As shown in the drawing, the support pad 190 may be positioned at a portion of both end edges between the reflecting plate 125 and the cover bottom 150, but is not limited thereto, and the reflecting plate 125 and the cover bottom 150 are not limited thereto. It can be located over the whole space in between.

Accordingly, the liquid crystal panel 110 and the backlight unit 120 are surrounded by the support main 130 having the edges of the rectangular frame, and the top cover 140 covering the top edge of the liquid crystal panel 110 and at least the front surface thereof. The cover bottom 150 covering the back surface of the backlight unit 120 including the support pads 190 positioned at one edge thereof is combined with each other in front and rear to be integrated through the support main 130 to be modularized.

Accordingly, the first and second side light emitted from each of the plurality of first and second LEDs 129a and 129b included in the center of the light guiding means 123 of the backlight unit 120 may be guided by the light guiding means 123. It is refracted and reflected in the interior and proceeds in the light guiding means 123, and is processed into a more uniform high-quality surface light source while passing through the plurality of optical sheets 121 together with the light reflected by the reflector 125. It is supplied to the panel 110.

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.

3 is a cross-sectional view showing a liquid crystal display module according to a second embodiment of the present invention. Here, except for the cover bottom and the support pad, since it has the same configuration as that of FIG. 2, the same reference numeral is assigned to the same configuration, and a description of the same configuration is omitted.

The cover bottom 250 has a rectangular plate shape and its four edges are vertically bent to form four sides.

In particular, as shown in Figure 3, the front of the cover bottom 250, the first and second support portion (250b, protruding upwardly inclined in the left and right outward direction relative to the center portion 250a corresponding to the center line thereof; 250c).

Accordingly, the thickness of the center portion 250a is the thinnest, and the thickness becomes thicker from the center portion 250a toward the outside of the left and right sides.

The central portion 250a of the cover bottom 250 corresponds to the horizontal portion 123a of the light guiding means 123, and each of the first and second supporting parts 250b and 250c of the cover bottom 250 is formed of light guide means ( Corresponding to the first and second inclined portions 123b and 123c of 123.

Accordingly, each of the first and second support parts 250b and 250c may contact the reflector plate 125 with the first and second inclined parts 123b and 123c of the light guiding means 123, while the reflecting plate of the backlight unit 120 is in close contact with each other. It fills the space between the 125 and the cover bottom 250.

As such, applying the cover bottom 250 according to the present invention eliminates the need for the support pad 190 used in FIG. 2, thereby reducing parts and assembly process time, and further reducing manufacturing cost and overall manufacturing time. .

In addition, the reflective plate 125 is seated on the top of the cover bottom 250, and the LED assembly 129 is disposed along the center line, and then the light guide means 123 may be manufactured by directly injecting and curing the UV curing resin. do.

A space corresponding to the light guiding means is formed through the side of the cover bottom 250 and the first and second supporting parts 250b and 250c to fill the space with the liquid UV cured resin, and the UV light is applied from the upper portion of the cover in the first minute. By irradiating over a few minutes, the light guide unit 123 may be hardened by curing. This eliminates the need for a separate light guide means.

Such cover bottom 250 may be fabricated by injection molding used to mold a particular shape.

4 is a cross-sectional view showing a liquid crystal display module according to a third embodiment of the present invention. Here, except for the light guiding means, since it has the same configuration as that of FIG. 2, detailed description of the same configuration will be omitted.

As shown in FIG. 4, the liquid crystal display module 300 includes a liquid crystal panel 310, a backlight unit 320, and a support main 330 for modularizing the liquid crystal panel 310 and the backlight unit 320. ) And a cover bottom 350 and a top cover 340.

The backlight unit 320 includes a light guiding means 323 including a light source, a reflecting plate 325 positioned on the rear surface of the light guiding means 323, and a plurality of optical sheets interposed on the light guiding means 323. 321).

Here, referring to the cross-sectional shape of the light guiding means 323, the light guiding means 323 includes a first side in which a plurality of LEDs 329a are embedded and a second side facing the first side. It has a wedge shape having a lower portion of the inclined portion 323a which becomes thinner from the side to the second side.

In the light guide means 323, the reflector plate 325 is seated on the front surface of the cover bottom 350, and the LED assembly 329 is fixed to the first side of the cover bottom 350 through the adhesive pad 370. After injecting the UV cured resin in, it can be produced by curing the UV cured resin by UV irradiation.

At this time, since the position of the LED assembly 329 is fixed through the adhesive pad 370, the light guide means 323 in which the plurality of LEDs 329a are embedded on one side thereof may be more easily manufactured.

The light guiding means 323 manufactured as described above refracts and reflects the incident light emitted from the plurality of LEDs 329a embedded in the first side of the light guiding means 323. By spreading evenly over a wide area of) provides a surface light source to the liquid crystal panel (310).

In particular, since the refractive index of the UV cured resin used for manufacturing the light guiding means 323 is approximately 1.46, and the refractive index of the resin used for manufacturing each of the plurality of LEDs 329a is approximately 1.42, the plurality of LEDs 329a are similar to each other. As light emitted from each other is incident into the light guiding means 323 without any loss, the light receiving efficiency is increased to increase the light efficiency.

In addition, as a plurality of LEDs 329a are embedded in one side of the light guiding means 323, the space for disposing the LED assembly 329 may be reduced.

To explain this, conventionally, as the LED assembly (29 of FIG. 1) is disposed on one side of the cover bottom (50 of FIG. 1), the first interval (FIG. 1A) requires such a first interval (FIG. 1). Although the width L of the bezel including A) is required, in the present invention, each of the second thickness (A2 of FIG. 1) and each of the plurality of LEDs (29A of FIG. 1) of each of the plurality of LEDs (29a of FIG. 1) And the second gap (A3 in FIG. 1) between the light guide plate and the light guide plate (23 in FIG. 1) is no longer needed, thereby reducing the width by combining the second thickness (A2 in FIG. 1) and the second interval (A3 in FIG. 1). A liquid crystal display device having a narrow width N of the bezel may be implemented.

The reflection plate 325 is positioned on the rear surface of the light guiding means 323 to reflect the light passing through the rear surface of the light guiding means 323 toward the liquid crystal panel 310 to improve the brightness of the light.

Here, the reflective plate 325 may include a pattern of a specific shape for injecting the light passing through the back of the light guide means 323 in the direction of the liquid crystal panel 310, by adjusting the size or density of the pattern more uniform The surface light source may be supplied to the liquid crystal panel 310.

On the other hand, the plurality of optical sheets 321 interposed above the light guide means 323 includes a diffusion sheet, at least one prism sheet, a protective sheet, and the like, and diffuses or condenses the light passing through the light guide means 323. A more uniform surface light source is incident on the liquid crystal panel 310.

As described above, the liquid crystal panel 310 and the backlight unit 320 are modularized through the support main 330, the top cover 340, and the cover bottom 350.

Here, the support pad 390 may be positioned between the cover bottom 350 and the backlight unit 320 during the modularization process, and the support pad 390 is positioned at the rear surface of the reflector plate 325 to form a wedge shape. The light guide unit 323 fills the space generated between the backlight unit 320 and the cover bottom 350 and serves to bring the reflective plate 325 into close contact with the light guide means 323.

As shown in the drawing, the support pad 390 may be located in the space between the reflecting plate 325 and the cover bottom 350 and at a part of the edge, but is not limited thereto. The reflecting plate 325 and the cover bottom 350 are not limited thereto. It can be located over the whole space in between.

In addition, although not shown in the drawing, the cover bottom 350 may be formed in a wedge shape having an inclined upper portion corresponding to the inclined portion 323a of the light guiding means 323 and having a thicker thickness as it moves away from the LED assembly 329. It may be.

Accordingly, the liquid crystal panel 310 and the backlight unit 320 have a top frame 340 covering the top edge of the liquid crystal panel 310 and the support pads while the edges are surrounded by the support main 330 having a rectangular frame shape. The cover bottoms 350 covering the rear surface of the backlight unit 320 with the 390 attached thereto are coupled to each other in front and rear, and are integrated and modularized through the support main 330.

Accordingly, light emitted from each of the plurality of LEDs 329a embedded in the first side surface of the light guiding means 323 of the backlight unit 320 is refracted and reflected in the light guiding means 323 to guide the light guiding means 323. Proceeding therein, while passing through the plurality of optical sheets 321 with the light reflected by the reflecting plate 325 is processed into a more uniform high-quality surface light source is supplied to the liquid crystal panel 310.

As described above, according to the present invention, by embedding the LED assembly on one side or the center of the light guiding means to minimize the difference in refractive index at the interface at which light is incident, increase the light receiving efficiency, there is a separate space for placing the LED assembly Since it is not necessary, the width of the bezel can be reduced.

Accordingly, it is possible to realize a high quality and high brightness liquid crystal display device with a narrow bezel.

In addition, it is possible to reduce the manufacturing cost by forming a pattern for reflecting light on the reflecting plate, not the back of the light guide means.

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, 310: liquid crystal panel 120, 320: backlight unit
125 and 325: reflecting plates 123 and 323: light guiding means
123a: horizontal portion 123b: first inclined portion
123c: second inclined portion 323: inclined portion
121, 321: Multiple optical sheets 129a, 129b, 329a: LED
130: support main 140: top cover
150: Coverumum 150a: Center
150b: first support 150c: second support

Claims (16)

A liquid crystal panel;
Located on the rear of the liquid crystal panel including a reflector plate, LED assembly disposed along the inner center line, including a light guiding means positioned above the reflecting plate, and a plurality of optical sheets positioned above the light guiding means. A backlight unit;
A cover bottom coupled and fastened at the back of the backlight unit,
The lower portion of the light guide means
And a horizontal portion in which the LED assembly is positioned upward, and first and second inclined portions inclined upwardly to the left and right outer sides of the horizontal portion.
The method of claim 1,
The LED assembly
2. A liquid crystal display device comprising a plurality of first LEDs and a plurality of second LEDs each mounted on both sides of a printed circuit board.
The method of claim 2,
The printed circuit board
A first surface on which the plurality of first LEDs emitting light in a first side direction is mounted, and the plurality of light emitting parts in a second side direction opposite to the first side direction corresponding to the first surface; Liquid crystal display device corresponding to a double-sided printed circuit board including a second surface on which the second LED is mounted.
The method of claim 2,
The printed circuit board
A first printed circuit board on which the plurality of first LEDs emitting light in a first side direction is mounted, and the light emitting part in a second side direction opposite to the first side direction corresponding to the first side; 2. A liquid crystal display device wherein a rear surface of a second printed circuit board on which a plurality of second LEDs are mounted is bonded to each other.
The method according to claim 3 or 4,
Each of the plurality of first LEDs and each of the plurality of second LEDs
A liquid crystal display device which is mounted so that its center is positioned on the same line or is staggered from each other.
The method of claim 1,
The reflector
And a pattern formed to uniformly spread light emitted from each of the plurality of LEDs.
The method of claim 1,
Between the cover bottom and the reflector
And at least one support pad for contacting the reflector to each of the first and second inclined portions of the light guide plate.
The method of claim 1,
The cover bottom is
And a center portion corresponding to the horizontal portion, a first support portion corresponding to the first slope portion, and a second support portion corresponding to the second slope portion.
The method of claim 1,
The light guiding means
Liquid crystal display device formed of a UV cured resin.
The method according to any one of claims 2 to 5.
The refractive index of the light guiding means is 1.46, and the refractive index of each of the plurality of first and second LEDs is 1.42.
A liquid crystal panel;
A light guide unit including a reflector plate, an LED assembly including a plurality of LEDs inside the first side, and including a plurality of optical sheets positioned above the light guide unit; A backlight unit positioned on the rear surface;
A cover bottom coupled and fastened at the back of the backlight unit,
The light guiding means
And a first side in which the LED assembly is located, and a second side facing the first side, and having a wedge-shaped liquid crystal having a lower thickness inclined toward the second side from the first side. Display.
12. The method of claim 11,
The reflector
And a pattern for reflecting light passing through the light guiding means toward the liquid crystal panel.
12. The method of claim 11,
Between the cover bottom and the reflector
And a support pad for contacting the reflective plate to the light guide plate.
12. The method of claim 11,
The cover bottom is
And an inclination on the upper portion of which the thickness increases from one end corresponding to the first side to the end corresponding to the second side.
12. The method of claim 11,
The light guiding means
Liquid crystal display device formed of a UV cured resin.
12. The method of claim 11,
Wherein the refractive index of the light guiding means is 1.46, and the refractive index of each of the plurality of LEDs is 1.42.
KR1020110065592A 2011-07-01 2011-07-01 Liquid crystal display device KR20130003937A (en)

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Application Number Priority Date Filing Date Title
KR1020110065592A KR20130003937A (en) 2011-07-01 2011-07-01 Liquid crystal display device

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20140131191A (en) * 2013-05-03 2014-11-12 삼성디스플레이 주식회사 Organic light emitting display device
US9140845B2 (en) 2013-07-02 2015-09-22 Samsung Display Co., Ltd. Display device having improved illumination characteristics

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20140131191A (en) * 2013-05-03 2014-11-12 삼성디스플레이 주식회사 Organic light emitting display device
US9140845B2 (en) 2013-07-02 2015-09-22 Samsung Display Co., Ltd. Display device having improved illumination characteristics

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