KR102084396B1 - Liquid crystal display device - Google Patents

Abstract

The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device including a top view type LED assembly.
A feature of the present invention is that by using a top-view LED assembly that can implement a high brightness, it is possible to implement a high brightness in a small amount, to increase the number of LEDs, or to use an expensive LED having an expensive high brightness distribution range By not doing this, it is possible to prevent the problem of an increase in manufacturing cost from occurring.
In addition, it is possible to prevent the yellowish phenomenon from occurring, and to implement white light having high white reproducibility and uniform luminance.
In particular, even when a top view type LED assembly is used, a plurality of LEDs are mounted on a PCB where the LED assembly is bent into the first to third regions, and the light incident surface of the light guide plate is formed to have an inclined surface, thereby increasing the thickness of the liquid crystal display device. Since it does not increase, it is possible to provide a lightweight and thin liquid crystal display device.

Description

Liquid crystal display device

The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device including a top view type LED assembly.

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, which is bonded between two substrates in parallel with a liquid crystal layer, 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, and for this purpose, a backlight having a light source embedded therein is disposed on the back of the liquid crystal panel.

The backlight unit uses a cold cathode fluorescent lamp (CCFL), an external electrode fluorescent lamp, and a light emitting diode (LED) as a light source.

Among them, LEDs are particularly widely used as light sources for displays having features such as small size, low power consumption, and high reliability.

Meanwhile, a general backlight unit is classified into a direct type method and an edge type method according to an arrangement of lamps. In the edge type method, one or a pair of light sources is provided with 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.

Here, the direct type has a limitation in thinning, and is mainly used in a liquid crystal display device in which brightness is more important than the thickness of the screen, and the edge type which is lighter and thinner than the direct type is such as a notebook PC or a monitor PC. It is mainly used in liquid crystal displays where thickness is important.

1 is a cross-sectional view of a liquid crystal display including a general edge type backlight unit using LED as a light source.

As illustrated, the LCD including the backlight unit 20 of the general edge type has a liquid crystal panel 10 and a backlight unit 20, and a guide panel 30, a cover bottom 50, and a top cover ( 40).

The liquid crystal panel 10 is a part that plays a key role in image expression and is composed of first and second substrates 12 and 14 bonded to each other with a liquid crystal layer interposed therebetween.

In addition, reference numerals 19a and 19b denote polarizers attached to the front and rear surfaces of the liquid crystal panel 10 to control the polarization direction of light, respectively.

The backlight unit 20 is provided behind the liquid crystal panel 10.

The backlight unit 20 is arranged along at least one side edge length direction of the guide panel 30, and includes a plurality of LEDs 29a and a PCB 29b on which the LEDs 29a are mounted. A white or silver reflector 25 mounted on the bottom 50, a light guide plate 23 seated on the reflector 25, and an optical sheet 21 positioned thereon.

In addition, the light blocking tape 60 is further positioned on the optical sheet 21, and the light blocking tape 60 may serve to prevent light from leaking to an area other than the display area of the liquid crystal panel 10.

The liquid crystal panel 10 and the backlight unit 20 have a top cover 40 surrounding the top edge of the liquid crystal panel 10 and a back surface of the backlight unit 20 with the edges surrounded by the guide panel 30 having a rectangular frame shape. Cover cover 50 to cover each is coupled in front and rear are integrated through the guide panel 30.

On the other hand, the liquid crystal display device has recently been increasingly used, such as portable computers, desktop computer monitors and wall-mounted televisions. As a result, researches that have a large display area and have significantly reduced weight and volume have been made. It is actively underway.

In addition, there is a need for a liquid crystal display device that can realize high brightness while reducing manufacturing costs.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and a first object of the present invention is to provide a liquid crystal display device having a light weight and a thin shape.

In addition, another object of the present invention is to provide a liquid crystal display device capable of realizing high brightness while reducing manufacturing costs.

In order to achieve the object as described above, the present invention is a liquid crystal panel; A PCB disposed under the liquid crystal panel, the PCB comprising a first region, a second region perpendicular to the first region, and a third region formed to be inclined from the second region so as to face the first region; A backlight unit including a top view type LED assembly including an LED mounted inside three regions, and a light guide plate including an incident surface inclined to face an upper surface of the LED; A guide panel including a vertical portion covering an edge of the backlight unit and a horizontal portion protruding inwardly from the vertical portion to support a rear edge of the liquid crystal panel; And a cover bottom including a horizontal surface on which the liquid crystal panel and the backlight unit are seated and a side surface perpendicular to the horizontal surface, wherein the LED assembly provides a liquid crystal display device that emits light toward an upper surface of the LED.

An inclined surface in which the third region is in close contact is formed on the rear surface of the vertical portion of the guide panel, the first region is in close contact with the inner side of the horizontal plane, and the second area is in close contact with the inner side of the side surface.

The backlight unit may include a plurality of optical sheets on the light guide plate and a reflection plate under the light guide plate, and a light blocking tape may be attached to a rear surface of the horizontal portion to cover a portion of an edge of the light incident surface side of the light guide plate. The angle at which the upper surface in contact with the optical sheet forms the light incident surface is greater than the right angle, and the angle at which the lower surface in contact with the reflecting plate forms the light incident surface is smaller than the right angle.

In addition, at least one of the plurality of optical sheets is formed to partially cover the upper portion of the light shielding tape.

As described above, according to the present invention, by using the top-view type LED assembly capable of realizing high brightness, it is possible to implement high brightness in a small quantity, to increase the number of LEDs, or to have an expensive high brightness distribution range By not using an expensive LED, there is an effect that can prevent the problem that the manufacturing cost increases.

In addition, it is also possible to prevent the occurrence of the yellowish phenomenon, there is an effect that can implement a white light having a high white reproducibility and uniform brightness.

In particular, even when a top view type LED assembly is used, a plurality of LEDs are mounted on a PCB where the LED assembly is bent into the first to third regions, and the light incident surface of the light guide plate is formed to have an inclined surface, thereby increasing the thickness of the liquid crystal display device. There is no increase, and there is an effect that a lightweight and thin liquid crystal display device can be provided.

1 is a cross-sectional view of a liquid crystal display including a backlight unit of a general edge type method using an LED as a light source.
FIG. 2A is a schematic cross-sectional view of a top view type LED assembly applied to a liquid crystal display according to an exemplary embodiment of the present invention. FIG.
FIG. 2B is a schematic cross-sectional view of a side view type LED assembly for comparison thereto. FIG.
3 is an exploded perspective view of a liquid crystal display according to an exemplary embodiment of the present invention.
FIG. 4 is a schematic cross-sectional view of FIG. 3 modularized.

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

FIG. 2A is a cross-sectional view schematically illustrating a top view type LED assembly applied to a liquid crystal display according to an exemplary embodiment of the present invention, and FIG. 2B is a cross-sectional view schematically showing a side view type LED assembly for comparison thereto.

As shown, the LED assembly (100, 200) is a plurality of LEDs (120, 220), a plurality of LEDs (120, 220) are spaced apart by a predetermined interval is mounted by surface mount technology (SMT) PCBs 110 and 210 are included.

Here, the PCB (110, 210) is composed of a power wiring layer (105, 205), an insulating layer (103, 203) and a PCB base (101, 201) formed with metal wiring (not shown), PCB base 101, 201 ) Is supported by mounting the power supply wiring layers 105 and 205 and the insulating layers 103 and 203 and other components on the upper layer and dissipating heat generated from the plurality of LEDs 120 and 220 to the bottom side. .

The PCB bases 101 and 201 may be formed of a metal having high thermal conductivity such as aluminum (Al) or copper (Cu), or may be coated with a heat transfer material to improve heat dissipation.

Power wiring layers 105 and 205 including a plurality of metal wirings (not shown) formed by patterning a conductive material on the PCB bases 101 and 201 are formed, and the PCB bases 101 and 201 and the power wiring layer are formed. The insulating layers 103 and 203 are positioned between the 105 and 205 to electrically insulate the PCB bases 101 and 201 from a plurality of metal wires (not shown).

The plurality of LEDs 120 and 220 are arranged in series on the PCBs 110 and 210 at regular intervals, and the metal wirings (not shown) and the LEDs of the power wiring layers 105 and 205 on the PCBs 110 and 210 are arranged in series. A pair of wires 127 and 227 of 120 and 220 are electrically connected.

The LEDs 120 and 220 are composed of LED chips 121 and 221 emitting large light and a lens unit for controlling the angle of main outgoing light generated from the LED chips 121 and 221.

More specifically, first, the LED chips 121 and 221 are surrounded by the housings 123 and 223 serving as housings, and the cases 123 and 223 are configured to have sidewalls protruding highly upward, and the inner surface of the sidewalls. Forms a reflective surface.

The side walls serve to block or reflect the light emitted from the LED chips 121 and 221 to the front, and form a region in which the transparent resins 125 and 225 are filled.

That is, a storage space is defined above the LED chips 121 and 221 by sidewalls of the cases 123 and 223 formed to surround the LED chips 121 and 221, and the transparent resins 125 and 225 are formed in the storage space. ) Is filled to form a lens unit for controlling the angle of the main outgoing light of the LED (120, 220).

In this case, the transparent resins 125 and 225 may include phosphors (not shown), and a mixture of phosphors (not shown) with a transparent epoxy resin (not shown) or silicone resin (not shown) may be used at a predetermined ratio. .

The LED chips 121 and 221 are electrically connected to a metal wiring (not shown) of the power supply layers 105 and 205 provided on the PCBs 110 and 210 by a pair of wires 127 and 227.

The LED assemblies 100 and 200 may be divided into a top view type and a side view type according to the direction in which light is emitted. The top view type illustrated in FIG. 2A is perpendicular to the PCB 110. The light emitted toward the front of the upper surface of the LED 120, the side view type shown in Figure 2b is the side of the LED 220 in a direction parallel to the PCB 210 is emitted toward the side.

The LED assemblies 100 and 200 are positioned so that the light incidence surface 323a (see FIG. 3) of the light guide plate 323 (see FIG. 3) corresponds to the front from which light is emitted, where the side view type LED assembly 200 is formed. 2, the height h2 is lower than the first height h1 of the top view type LED assembly 100 in the backlight unit 120 (refer to FIG. 3). It can provide, and is widely used.

However, the side view type LED assembly 200 has a disadvantage that the brightness is low as the light is emitted toward the side of the LED (220).

Therefore, to compensate for this, by increasing the number of LEDs 220 or by using expensive LEDs 220 having a high brightness LED scattering range in the CIE (commission internationale de'Eclairage) color coordinates, manufacturing cost is improved It causes a problem.

In particular, since the LED 220 having a high brightness LED distribution range has a very small quantity of white color regions, a yellowish phenomenon may occur as the LEDs 220 of a yellowish white color region are used. It causes a problem that the image degrades the desired reference white reproducibility and the reproducibility of uniform luminance.

However, the liquid crystal display of the present invention can implement a high brightness in a small amount by using the top view type LED assembly 100, increasing the number of LEDs 120, or a high price having a high distribution range of high brightness By not using the LED, it is possible to prevent the problem that the manufacturing cost increases.

Power Consumption Per LED Brightness Per LED LED Count in LED Assembly Power Consumption of LED Assembly Maximum Power Consumption of LED Assembly Top View Type LED Assembly 19.5 mA 7000nit 42 2.33 W 2.37 W Side view type LED assembly 19.0 mA 7038nit 40 2.16 W 2.20 W

Referring to Table 1 above, the power consumption per LED of the LED 120 mounted on the top view type LED assembly 100 is lower than the power consumption per LED 220 mounted on the side view type LED assembly 200. You can see that. In addition, the luminance per LED of the LED 120 mounted on the top view type LED assembly 100 may be higher than the luminance per LED of the LED 220 mounted on the side view type LED assembly 200.

Therefore, the top view type LED assembly 100 according to the embodiment of the present invention can implement high brightness even with a small number of LEDs 120, and the LED assembly 100 can be realized even though the number of LEDs 120 is reduced. Has the effect of lowering the power consumption.

Through this, by increasing the number of LEDs 120, or do not have to use expensive LEDs having an expensive high brightness distribution range, it is possible to prevent the problem that the manufacturing cost increases.

In addition, it is possible to prevent the yellowish phenomenon from occurring, thereby realizing white light having high white reproducibility and uniform luminance.

In particular, the liquid crystal display of the present invention has an advantage that the thickness of the liquid crystal display device does not increase even when the top view type LED assembly 100 is used.

Accordingly, the liquid crystal display device of the present invention can provide a liquid crystal display device that can provide a light weight and thin liquid crystal display device while achieving high brightness while reducing manufacturing costs.

This will be described in more detail with reference to FIG. 3.

3 is an exploded perspective view of a liquid crystal display according to an exemplary embodiment of the present invention.

As shown, the liquid crystal display device includes a liquid crystal panel 310, a backlight unit 320, a guide panel 330, and a cover bottom 350.

In this case, for convenience of description, the direction in the drawing is defined, and the backlight unit 320 is disposed behind the liquid crystal panel 310 on the premise that the display surface of the liquid crystal panel 310 faces the front side, The cover bottom 350 is positioned on the rear surface of the backlight unit 320 while the guide frame 330 of the rectangular frame shape is worn.

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

First, the liquid crystal panel 310 plays a key role in the image expression of the liquid crystal display device, the first substrate 312 and the second substrate 314 bonded to each other and the liquid crystal layer interposed therebetween. (Not shown).

Here, although not shown in the drawing, a plurality of gate lines and data lines intersect each other on the inner surface of the first substrate 312, which is commonly referred to as a lower substrate or an array substrate, and a thin film transistor is defined at each intersection point. (thin film transistor: TFT) is provided and is connected one-to-one with the transparent pixel electrode formed in each pixel.

An inner surface of the second substrate 314, called an upper substrate or a color filter substrate, may correspond to each pixel, for example, a color filter of red (R), green (G), and blue (B) color, and these. A black matrix is provided covering each of the gate lines, the data lines, and the thin film transistors.

In addition, a transparent common electrode covering the red (R), green (G), and blue (B) colors and the black matrix is provided.

At this time, although not clearly shown in the drawings, the upper and lower alignment layers (not shown) for determining the initial molecular alignment direction of the liquid crystal are interposed between the two substrates 312 and 314 and the liquid crystal layer (not shown). In order to prevent leakage of the liquid crystal layer (not shown) filled between the first and second substrates 312 and 314, a seal pattern (not shown) is formed along the edges of both substrates 312 and 314. .

In addition, polarizing plates 319a and 319b (see FIG. 4) for selectively transmitting only specific light are attached to outer surfaces of the first and second substrates 312 and 314, respectively.

Along the edge of the liquid crystal panel 310, the printed circuit board 317 is connected through a connecting member 316 such as a flexible printed circuit board or a tape carrier package (TCP) to cover the module in the process of modularization. The bottom portion 350 is properly folded to be in close contact.

At this time, the printed circuit board 317 which is folded and adhered to the rear surface of the cover bottom 350 is attached and fixed through a first adhesive pad 371 (see FIG. 4) such as a double-sided tape.

Therefore, the liquid crystal panel 310 is the image signal of the data line to the corresponding pixel electrode when the thin film transistor selected for each gate line is turned on by the on / off signal of the thin film transistor that is scanned and transferred to the gate line. Is transferred, and the arrangement direction of the liquid crystal molecules is changed by the electric field between the pixel electrode and the common electrode, thereby generating a difference in transmittance.

In addition, the liquid crystal display according to the present invention is provided with a backlight unit 320 for supplying light from its rear surface such that the difference in transmittance indicated by the liquid crystal panel 310 is expressed to the outside.

The backlight unit 320 includes an LED assembly 100 arranged along at least one edge in the longitudinal direction of the cover bottom 350, a reflecting plate 325, a light guide plate 323 seated on the reflecting plate 325, and The optical sheet 321 is positioned above the light guide plate 323.

The LED assembly 100 is a light source of the backlight unit 320, and is located at one side of the light guide plate 323 to face the light incident surface 323a of the light guide plate 323, and the LED assembly 100 includes a plurality of LEDs 120. And a plurality of LEDs 120 are mounted at a predetermined interval apart from the PCB 110.

At this time, the LED assembly 100 of the present invention consists of a top view type LED assembly for emitting light to the front of the LED (120). In addition, the PCB 110 may refer to the first region 110a (see FIG. 4) in close contact with the rear surface of the reflector plate 325, and the second region 110b (FIG. 4) perpendicular to the first region 110a (see FIG. 4). ) And a third region 110c (see FIG. 4) formed at an angle to the second region 110b (see FIG. 4) so as to face the first region 110a (see FIG. 4). 120 is mounted inside the third region 110c (see FIG. 4).

The light guide plate 323 to which light emitted from the plurality of LEDs 120 is incident is uniformly spread over a wide area of the light guide plate 323 while the light incident from the LED 120 travels in the light guide plate 323 by a plurality of total reflections. It spreads to provide a surface light source to the liquid crystal panel 310.

In this case, the light incident surface 323a of the light guide plate 323 is inclined to face the LED 120 mounted on the third region 110c (see FIG. 4) of the PCB 110.

The liquid crystal display of the present invention can implement high brightness even with a small quantity by using the top view type LED assembly 100, thereby increasing the number of LEDs 120, or having an expensive distribution range of expensive high brightness. By not using the LED, it is possible to prevent the problem that the manufacturing cost increases.

In addition, it is possible to prevent the yellowish phenomenon from occurring, thereby realizing white light having high white reproducibility and uniform luminance.

In particular, even when the top view type LED assembly 100 is used, the thickness of the liquid crystal display device does not increase, thereby providing a lightweight and thin liquid crystal display device. We will discuss this in more detail later.

The reflection plate 325 is disposed on the rear surface of the light guide plate 323, and reflects light passing through the rear surface of the light guide plate 323 toward the liquid crystal panel 310 to improve the brightness of the light.

The optical sheet 321 on the light guide plate 323 includes a diffusion sheet and at least one light collecting sheet, and diffuses or collects light passing through the light guide plate 323 to provide a more uniform surface light source to the liquid crystal panel 310. Make it incident.

In addition, a light blocking tape 360 may be provided between the optical sheet 321 and the liquid crystal panel 310 to prevent light emitted from the LED 120 from leaking to portions other than the display area of the liquid crystal panel 310. .

The liquid crystal panel 310 and the backlight unit 320 are modularized through the guide panel 330 and the cover bottom 350. The guide panel 330 supports the edge of the liquid crystal panel 310 and the backlight unit 320. In the rectangular frame shape to surround the edge of the horizontal, the vertical portion 331 surrounding the side of the backlight unit 320 and the horizontal portion separating the position of the liquid crystal panel 310 and the backlight unit 320 inside the vertical portion 331 The unit 333 is provided.

The liquid crystal panel 310 is attached and fixed on the horizontal portion 333 through a second adhesive pad 373 (see FIG. 4) such as a double-sided tape.

At this time, one edge of the guide panel 330 corresponding to one edge where the LED assembly 100 is positioned has a rear surface of the vertical portion 331 at the third region 110c of the PCB 110 of the LED assembly 100. Corresponding to 4), the inclined surface 335 (see FIG. 4).

The guide panel 330 is seated on the cover bottom 350, the cover bottom 350 is composed of a horizontal surface 351, the edge of the horizontal surface 351 is vertically bent edge portion 353.

Here, the guide panel 330 may be referred to as a support main or main support and a mold frame, and the cover bottom 350 may be referred to as a bottom cover or a lower cover.

In addition, the liquid crystal display having the above-described structure has been described as an example in which the top cover is removed in order to realize a light weight and thin liquid crystal display device which is recently required. However, the top cover is positioned in front of the liquid crystal panel 310. You may.

As described above, the liquid crystal display of the present invention can implement high brightness even with a small quantity by using the top view type LED assembly 100, thereby increasing the number of LEDs 120, or an expensive high brightness distribution range. By not using an expensive LED having a, it is possible to prevent the problem that the manufacturing cost increases.

In addition, it is possible to prevent the yellowish phenomenon from occurring, thereby realizing white light having high white reproducibility and uniform luminance.

In particular, even when the top view type LED assembly 100 is used, a plurality of LEDs 120 on the PCB 110 in which the LED assembly 100 is bent into the first to third regions 110a, 110b, 110c (see FIG. 4). ) Is mounted and the light incident surface 323a of the light guide plate 323 is inclined so as to face the upper surface of the LED 120 so that the thickness of the liquid crystal display device does not increase, thereby providing a lightweight and thin liquid crystal display device. can do.

4 is a schematic cross-sectional view of the modularized FIG. 3.

As illustrated, the liquid crystal panel 310 and the backlight unit 320 that supplies light from the rear of the liquid crystal panel 310 may face the rear surface of the backlight unit 320 with the edges surrounded by the guide panel 330. It is combined with the covering cover tomb 350 (FIG. 3) to be integrally modular.

In the liquid crystal panel 310, a liquid crystal layer (not shown) is interposed between the first and second substrates 312 and 314, and only a specific light is selected as an outer surface of each of the first second substrates 312 and 314. Polarizing plates 319a and 319b for transmitting through are attached.

The liquid crystal panel 310 is attached and fixed to the horizontal portion 333 of the guide panel 330 through the second adhesive pad 373.

At this time, the printed circuit board 317 connected through the connecting member 316 along one edge of the liquid crystal panel 310 is attached through the first adhesive pad 371 to the back of the cover bottom (350 in FIG. 3). And fixed.

The backlight unit 320 of FIG. 3 includes a reflector plate 325, a light guide plate 323, and an LED assembly 100 and a light guide plate 323 formed of a PCB 110 on which the LED 120 and the LED 120 are mounted. Consists of an optical sheet 321.

Here, the plurality of LEDs 120 emits light having red (R), green (G), and blue (B) colors toward the light incident surface 323a of the light guide plate 323, respectively. By lighting the 120 at once, white light by color mixing can be realized.

In particular, recently, in order to improve luminous efficiency and luminance, a blue LED 120 including a blue LED chip having excellent luminous efficiency and luminance is used, and as a phosphor, 'cerium doped yttrium aluminum garnet (YAG: Ce)', That is, a blue LED 120 made of yellow phosphor is used.

The blue light emitted from the LED 120 is transmitted through the phosphor and mixed with the yellow light emitted by the phosphor, thereby realizing white light.

At this time, only one LED 120 is shown in the drawing, but a plurality of LEDs 120 are mounted on the PCB 110 at regular intervals, thereby realizing white light by lighting them all at once.

The LED assembly 100 including the LED 120 includes a first region 110a, which is in close contact with the rear surface of the reflector 325, a second region 110b perpendicular to the first region 110a, and a first region ( The plurality of LEDs 120 are formed inside the PCB 110 and the third region 110c of the PCB 110, which are formed to be inclined at a predetermined angle with the second region 110b so as to face 110a. ) Is implemented.

The LED assembly 100 is fixed to the position by the adhesive method such that the light emitted from the plurality of LED 120 to face the light guide plate 323, the light incident surface 323a, for this purpose of one of the guide panel 330 An inclined surface 335 is formed on the rear surface of the vertical portion 331 of the edge, so that the first region 110a is covered with the third region 110c of the PCB 110 attached to the inclined surface 335. 3 is placed in close contact with the inner side of the horizontal surface 351, the second region (110b) is in close contact with the inside of the side surface 353 of the cover bottom (350 in Fig. 3), the position is fixed .

The light guide plate 323 to which the light emitted from the plurality of LEDs 120 is incident is a plastic material such as polymethylmethacrylate (PMMA), an acrylic transparent resin, which is one of transparent materials capable of transmitting light. Or it is produced in a flat type (polycarbonate: PC) series.

The light guide plate 323 has excellent transparency, weather resistance, and colorability to induce light diffusion when light is transmitted.

The light guide plate 323 may include a pattern of a specific shape on the lower surface to supply a uniform surface light source. Here, the pattern may be configured in various ways, such as an elliptical pattern, a polygonal pattern, a hologram pattern, and the like to guide light incident into the light guide plate 323. The pattern is formed on the lower surface of the light guide plate 323 by a printing method or an injection method.

At this time, one edge of the light guide plate 323 provided with the light incident surface 323a is positioned between the first region 110a and the third region 110c of the PCB 110 of the LED assembly 100 and thus the light incident surface 323a. It is formed to be inclined to face the upper surface of the LED 120 mounted in the third region (110c) of the PCB (110).

That is, the light guide plate 323 is formed to be inclined by forming the light incident surface 323a emitted from the LED assembly 100 in contact with the optical sheet 321 to be shorter than the bottom surface in contact with the reflective plate 325.

In this case, the inclination angle α formed between the upper surface of the light guide plate 323 and the light incident surface 323 has an angle greater than the right angle (90 degrees), and the inclination angle α is appropriately adjusted to face the LED 120. Can be. In addition, an angle β formed between the lower surface of the light guide plate 323 and the light incident surface 323a has an angle smaller than the right angle (90 degrees).

By inclining the light incident surface 323a of the light guide plate 323 in this way, the light incident surface 323a of the light guide plate 323 and the LED 120 of the LED assembly 100 face each other, and thus are emitted from the LED 120. The light incident area becomes larger, and as a result, the amount of light incident into the light guide plate 323 also increases, thereby improving optical characteristics.

Herein, the liquid crystal display of the present invention mounts the top view type LED assembly 100 on the PCB 110 divided into the first to third regions 110a, 110b, and 110c. The thickness can be reduced.

That is, referring to FIG. 2A, the top view type LED assembly 100 emits light toward the front of the upper surface of the LED 120 in a direction perpendicular to the PCB 110, thereby providing at least the light in the backlight unit 120 (FIG. 3). It is formed to have a first height (h1).

On the contrary, the top view type LED assembly 100 according to the embodiment of the present invention is configured by bending the PCB 110 into the first to third regions 110a, 110b, and 110c, and the LED is formed in one of the bent regions. By mounting the 120, the height of the LED assembly 100 is formed to have a third height h2 lower than that of the first height h1.

In addition, the light receiving plate 323a of the light guide plate 323 is formed to be inclined to face the upper surface of the LED 120 to increase the area of the light emitted from the LED 120, the LED assembly 100 is low Even when formed to have a height, a large amount of light may be incident into the light guide plate 323, thereby improving optical characteristics.

In this case, the light shielding tape 360 is attached to the rear surface of the horizontal portion 333 of the guide panel 330 so as to partially cover the upper part of the light incident surface 323a side of the light guide plate 323, and thus the display area of the liquid crystal panel 310. It will block the light from leaking to other parts.

At least one of the optical sheets 321 positioned above the light guide plate 323 is formed to cover the upper portion of the light shielding tape 360, and exits from the light guide plate 323 between the light shielding tape 360 and the optical sheet 321. It is possible to prevent the light from being incident directly onto the liquid crystal panel 310.

That is, the light emitted from the light guide plate 323 is processed into a high quality surface light source in the process of passing through the optical sheet 321 positioned above the light guide plate 323, between the light shielding tape 360 and the optical sheet 321. When light is directly incident on the liquid crystal panel 310 through the region of the light guide plate 323, the light may be incident on the liquid crystal panel 310 at a luminance different from that of light processed through the optical sheet 321. .

This may eventually cause light leakage, and according to the liquid crystal display of the present invention, the light blocking tape 360 and the optical sheet 321 are formed by extending at least one of the optical sheets 321 to the upper portion of the light blocking tape 360. It is to prevent the light emitted from the light guide plate 323 into the area between the direct incident to the liquid crystal panel 310.

Through this, it is possible to prevent the light leakage phenomenon occurs.

As described above, the liquid crystal display of the present invention uses the top view type LED assembly 100 that can implement a high brightness, it is possible to implement a high brightness with a small number of LEDs 120, the number of LEDs 120 It is possible to prevent the problem that the manufacturing cost is increased by increasing the cost or by not using an expensive LED having an expensive high brightness distribution range.

In addition, it is possible to prevent the yellowish phenomenon from occurring, thereby realizing white light having high white reproducibility and uniform luminance.

In particular, even when the top view type LED assembly 100 is used, the plurality of LEDs 120 are mounted on the PCB 110 where the LED assembly 100 is bent into the first to third regions 110a, 110b, and 110c. In addition, by forming the light incident surface 323a of the light guide plate 323 so as to be inclined to face the upper surface of the LED 120, the thickness of the liquid crystal display device does not increase, thereby providing a lightweight and thin liquid crystal display device.

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.

100: LED assembly (110: PCB (110a, 110b, 110c: first to third region), 120: LED)
310: liquid crystal panel 312, 314: first and second substrates, 316: connecting member, 317: printed circuit board, 319a, 319b: first and second polarizing plates)
321: optical sheet
323: light guide plate (323a: light incident surface)
325: reflector
330: guide panel (331: vertical portion, 333: horizontal portion, 335: inclined surface)
351: horizontal plane of cover bottom, 353: side of cover bottom

Claims (7)

A liquid crystal panel;
A PCB disposed under the liquid crystal panel, the PCB comprising a first region, a second region perpendicular to the first region, and a third region formed to be inclined from the second region so as to face the first region; A backlight unit including a top view type LED assembly including an LED mounted inside the three regions, and a light guide plate including an incident surface inclined to face an upper surface of the LED;
A guide panel including a vertical portion covering an edge of the backlight unit and a horizontal portion protruding inwardly from the vertical portion to support a rear edge of the liquid crystal panel;
Cover cover consisting of a horizontal surface on which the liquid crystal panel and the backlight unit is seated, and a side surface perpendicular to the horizontal surface
Includes, the LED assembly is light is emitted to the upper surface of the LED,
The rear surface of the vertical portion of the guide panel is formed with an inclined surface in close contact with the third region,
The first area is in close contact with the inner side of the horizontal plane, the second area is in close contact with the inner side of the side surface,
The LED assembly is a liquid crystal display device positioned between the guide panel and the horizontal plane.
The method of claim 1,
And the light incident surface of the light guide plate is positioned between the inclined surface and the horizontal surface of the guide panel.
delete The method of claim 1,
The backlight unit includes a plurality of optical sheets on the light guide plate and a reflection plate under the light guide plate, and a light blocking tape covering a part of an edge of the light incident surface side of the light guide plate is attached to the rear surface of the horizontal part.
The method of claim 4, wherein
The liquid crystal display of the light guide plate has an angle at which an upper surface of the light guide plate makes contact with the light incident surface is greater than a right angle, and an angle at which a lower surface of the light guide plate makes contact with the light incident surface is smaller than a right angle.
The method of claim 4, wherein
And at least one of the plurality of optical sheets is formed to partially cover an upper portion of the light blocking tape.


The method of claim 4, wherein
The upper portion of the horizontal portion is the liquid crystal panel is bonded and supported by a portion of the adhesive pad,
And a liquid crystal panel, the light blocking tape, and the horizontal portion overlap each other.

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