KR20170015828A - Back light Unit and Liquid Crystal Display Device having thereof - Google Patents

Abstract

The present invention relates to a backlight unit and a liquid crystal display device having the same. The liquid crystal display device of the present invention includes a liquid crystal display panel, and a backlight unit for supplying light to the liquid crystal display panel. The backlight unit includes: a bottom cover; first and second light source units arranged in the center of the bottom cover and having different numbers of light emitting packages; a third light source unit arranged in the edge of the bottom cover; and a light amount control unit arranged on the third light source unit. Therefore, the present invention has an effect of removing hot spot defects generated in the edge of the liquid crystal display panel.

Description

BACKLIGHT UNIT AND LIQUID CRYSTAL DISPLAY DEVICE HAVING THE SAME

The present invention relates to a backlight unit and a liquid crystal display device having the same.

Liquid crystal display devices are becoming more and more widespread due to features such as lightness, thinness, and low power consumption driving. Accordingly, the liquid crystal display device is proceeding in the direction of large-sized, thin, and low power consumption in response to the demand of the user.

In general, a liquid crystal display device includes a lower substrate including a thin film transistor, in which patterns such as a gate line, a data line, and a pixel electrode are formed, and an upper substrate on which patterns such as a black matrix and a color filter are formed, And a liquid crystal display panel.

Unlike a CRT (Cathode Ray Tube), the liquid crystal display device is not a self-luminous display device. Therefore, a backlight unit including a separate light source for providing light for visually expressing an image on a back surface of a liquid crystal display panel .

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

The edge type backlight unit has a structure that converts light emitted from a light source disposed on a side surface to plane light through a light guide plate and provides the converted plane light to the liquid crystal display panel.

The direct-type backlight unit has a structure in which a plurality of light sources are disposed under the liquid crystal display panel to provide light directly under the liquid crystal display panel.

1 is a view showing a structure of a direct-type liquid crystal display device according to the related art.

As shown in the figure, a conventional direct liquid crystal display device includes a liquid crystal display panel 10, a bottom cover 20 disposed under the liquid crystal display panel 10, A light emitting package 50 in which LED chips (Light Emitting Diode Chip) are mounted and a printed circuit board 30 in which the light emitting package 50 is mounted are disposed.

A general direct-type backlight unit has a structure in which a plurality of light-emitting packages 50 are arranged directly under the liquid crystal display panel 10, and a luminance difference is generated between a region where the light-emitting package 50 is disposed and an area where the light- There was a problem. In addition, it is difficult to position the light emitting diode to the corner area of the liquid crystal display panel 10 due to the physical restriction of the printed circuit board 30 having the bar type structure.

FIG. 2 is a diagram showing a non-uniform luminance phenomenon in a conventional direct-type liquid crystal display device. As shown in FIG. 2, dark portions in which the brightness rapidly decreases in the four corner regions A, B, C and D of the liquid crystal display device Can be seen.

In order to solve such a problem, the number of light emitting packages must be increased in a region corresponding to the edge region of the liquid crystal display panel 10, which increases the manufacturing cost.

If the number of the light emitting packages is increased in the area corresponding to the edge of the liquid crystal display panel 10 as described above, the brightness of the corner area of the liquid crystal display panel 10 becomes brighter than the center.

Particularly, due to the recent enlargement and slimming of the liquid crystal display panel 10, the unevenness of brightness in the corner areas of the liquid crystal display panel 10 is becoming more severe.

The present invention relates to a backlight unit in which luminance defects generated at corners of a liquid crystal display panel are removed by disposing a part of a printed circuit board on which light emitting packages are mounted and arranging a light emitting package in a region corresponding to an edge of the liquid crystal display panel, And it is an object of the present invention to provide a liquid crystal display device.

According to the present invention, a light emitting package is disposed in an area corresponding to an edge of a liquid crystal display panel, and a light amount adjusting unit integrally formed with a reflection plate is disposed on the light emitting package. Thus, hot spots The present invention also provides a backlight unit in which defects are removed and a liquid crystal display device having the same.

According to another aspect of the present invention, there is provided a liquid crystal display panel including a plurality of light emitting packages, each of the plurality of light emitting packages including a plurality of light emitting packages, Another object of the present invention is to provide a backlight unit and a liquid crystal display device having the backlight unit in which luminance unevenness occurring in the center and edge regions of the liquid crystal display panel is eliminated without changing the driving voltage supplied to the light emitting packages by arranging the circuit substrates alternately .

According to an aspect of the present invention, there is provided a backlight unit including a bottom cover, a bottom cover, a first and a second light source unit disposed in a central region of the bottom cover, A third light source unit disposed in an edge area of the bottom cover, and a light amount controller disposed on the third light source unit.

The first to third light sources are divided into a first group including a pair of the first light sources and a second group including the first through third light sources, and the number of the second light sources and the third light sources is Wherein the light emitting packages disposed on the first and second light source units include reflective lenses each having a concave surface, and the light emitting package disposed on the third light source unit has a convex surface And a reflection plate formed integrally with the light amount control unit on the bottom cover, wherein the light of the light emitting packages disposed on the first and second light source units is reflected by the bottom of the first and second light sources, The light of the light emitting package arranged in the third light source portion advances toward the upper side of the third light source portion, the light amount adjusting portion has a plurality of slit patterns, The light emitted from the third light source part has an effect of eliminating the brightness deficiency generated at the corner of the liquid crystal display panel by changing the light amount of light passing through the slit pattern according to the width of the slit pattern.

Further, the liquid crystal display device of the present invention includes a liquid crystal display panel and a backlight unit for supplying light to the liquid crystal display panel, wherein the backlight unit includes a bottom cover, The first and second light source portions having different numbers of light emitting packages, the third light source portion disposed in the corner region of the bottom cover, and the light amount adjusting portion disposed on the third light source portion, (Hot spot) defects that are caused by the hot spot.

The backlight unit and the liquid crystal display device having the same according to the present invention may be configured such that a part of the printed circuit board on which the light emitting packages are mounted is separated and the light emitting package is disposed in a region corresponding to the edge of the liquid crystal display panel, It is effective to eliminate the luminance defect.

A backlight unit and a liquid crystal display device having the backlight unit according to the present invention are characterized in that a light emitting package is disposed in an area corresponding to an edge of a liquid crystal display panel and a light amount control unit formed integrally with a reflection plate is disposed on the light emitting package, It has the effect of eliminating a hot spot defect occurring at the corner of the display panel.

In addition, a backlight unit and a liquid crystal display device having the same according to the present invention may be configured such that a light emitting package is disposed in a region corresponding to an edge of a liquid crystal display panel by separating a part of a printed circuit board on which light emitting packages are mounted, There is an effect that luminance unevenness phenomenon generated in the center and edge regions of the liquid crystal display panel is eliminated without changing the driving voltage supplied to the light emitting packages by alternately arranging the printed circuit boards having different numbers of the light emitting packages.

1 is a view showing a structure of a direct-type liquid crystal display device according to the related art.
FIG. 2 is a diagram in which a non-uniformity of brightness occurs in a conventional direct-type liquid crystal display device.
3 is a perspective view showing the structure of a liquid crystal display device according to the present invention.
4 and 5 are views showing a light source area of a backlight unit according to the present invention.
6 is a cross-sectional view of a liquid crystal display device according to the present invention.
7A and 7B are diagrams showing a structure of a light emitting package arranged at the center and corner areas of the liquid crystal display device of the present invention.
8 is an enlarged view of an edge area of the liquid crystal display device in FIG.
FIGS. 9A and 10B are views showing a state in which the amount of light is adjusted according to the structure of the light amount control unit formed in the reflector of the present invention.
11A to 11D are diagrams showing various structures of the light amount control unit of the reflector disposed in the backlight unit of the present invention.
12 is a view showing a state in which luminance unevenness is improved in an edge area of a liquid crystal display device of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims.

The shapes, sizes, ratios, angles, numbers, and the like disclosed in the drawings for describing the embodiments of the present invention are illustrative, and thus the present invention is not limited thereto. Like reference numerals refer to like elements throughout the specification. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

In the case where the word 'includes', 'having', 'done', etc. are used in this specification, other parts can be added unless '~ only' is used. Unless the context clearly dictates otherwise, including the plural unless the context clearly dictates otherwise.

In interpreting the constituent elements, it is construed to include the error range even if there is no separate description.

In the case of a description of the positional relationship, for example, if the positional relationship between two parts is described as 'on', 'on top', 'under', and 'next to' Or " direct " is not used, one or more other portions may be located between the two portions.

In the case of a description of a temporal relationship, for example, if a temporal posterior relationship is described by 'after', 'after', 'after', 'before', etc., 'May not be contiguous unless it is used.

The first, second, etc. are used to describe various components, but these components are not limited by these terms. These terms are used only to distinguish one component from another. Therefore, the first component mentioned below may be the second component within the technical spirit of the present invention.

It is to be understood that each of the features of the various embodiments of the present invention may be combined or combined with each other, partially or wholly, technically various interlocking and driving, and that the embodiments may be practiced independently of each other, It is possible.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the size and thickness of the device may be exaggerated for convenience. Like reference numerals designate like elements throughout the specification.

3 is a perspective view showing the structure of a liquid crystal display device according to the present invention.

3, a liquid crystal display 200 according to the present invention includes a liquid crystal display panel 110 on which an image is displayed, a backlight unit 120 disposed below the liquid crystal display panel 110 to provide light, And a panel guide 100 for supporting a periphery of the lower edge of the liquid crystal display panel 110.

The liquid crystal display panel 110 includes a thin film transistor substrate and a color filter substrate bonded together to maintain a uniform cell gap, and a liquid crystal layer interposed between the two substrates.

Although not shown in detail in the drawing, the thin film transistor substrate and the color filter substrate will be described in detail. In the thin film transistor substrate, pixels are defined by a plurality of gate lines and data lines crossing each other, a thin film transistor (TFT) is provided in a one-to-one correspondence with the pixel electrodes mounted on the respective pixels. The color filter substrate includes color filter layers of R, G, and B colors corresponding to the respective pixels, and a black matrix for covering the gate lines, the data lines, and the thin film transistors and the like.

A gate driver 112 for supplying a driving signal to the gate line is provided at an edge of the liquid crystal display panel 110 and a data driver 113 for supplying a driving signal to the data line. The gate driver 112 may not be formed on a separate printed circuit board, but may be formed on a thin film transistor substrate.

The gate and data drivers 112 and 113 are electrically connected to the liquid crystal display panel 110 by a chip on film (COF). Here, the COF may be changed to a TCP (Tape Carrier Package).

The backlight unit 120 disposed below the liquid crystal display panel 110 includes a bottom cover 180, first to third light sources 160, 161 and 162 disposed on the bottom cover 180, A reflection plate 170 disposed above the first to third light sources 160, 161 and 162, a diffusion plate 131 disposed above the reflection plate 170, And an optical sheet 130.

The first light source unit 160 includes a first printed circuit board 160b and first light emitting packages 160a disposed on the first printed circuit board 160b. And a second light emitting package (161a) disposed on the second printed circuit board (161b), and the third light source part (162) includes a third printed circuit board (162b) And third light emitting packages 162a disposed on the third printed circuit board 162b.

The reflector 170 includes a reflector 170a for reflecting the light emitted from the first to third light sources 160, 161 and 162 and a reflector 170a for reflecting the light emitted from the third light source 162 along the edge of the reflector 170a. A light amount adjusting unit 170b for controlling the amount of light emitted from the first and second light source units 160 and 161 and a light emitting hole formed in a region corresponding to the first and second light emitting packages 160a and 161a of the first and second light source units 160 and 161 170c.

The light amount control unit 170b of the reflection plate 170 is located in a region corresponding to four corner regions of the liquid crystal display panel 110. [

The optical sheets 130 include a diffusion sheet, a light condensing sheet, and a protective sheet. Here, the optical sheets 130 may be composed of a single diffusion sheet and two sheets of condensing sheets, or two sheets of diffusing sheets and a single sheet of condensing sheet.

Each of the first to third light emitting packages 160a, 161a and 162a is provided with lenses (not shown) for refracting light generated from the light emitting chip at a predetermined angle on the first to third light emitting chips (not shown) Respectively.

In the present invention, the first and second light source units 160 and 161 are provided with a reflection type lens so that light is refracted in a downward direction, and a third light source unit 162 arranged in four corners of the liquid crystal display panel 110 Is provided with a refraction type lens for refracting light in the upward direction. This will be described in detail below with reference to FIGS. 7A and 7B.

The backlight unit 120 of the present invention is characterized in that the printed circuit boards 160b and 161b of the first and second light source units 160 and 161 are disposed at the center of the bottom cover 180 adjacent to each other, The number of the second light emitting packages 161a disposed in the two light source units 161 is smaller than the number of the first light emitting packages 160a disposed in the first light source unit 160. [

The number of the second light emitting packages 161a of the second light source unit 161 is smaller than that of the first light emitting packages 160a of the first light source unit 160, Is the same as the number of the third light emitting packages 162a disposed on the third printed circuit board 162b of the third light source part 162 separated from the second light emitting part 161b.

Therefore, in the present invention, the number of the first light emitting packages 160a of the first light source unit 160 and the number of the second and third light emitting packages 160 disposed in the second light source unit 161 and the third light source unit 162, (161a, 162a) are the same.

The first light source unit 160, the second light source unit 161, and the third light source unit 162 are electrically connected to each other by a power supply line PL.

The third light source unit 162 electrically connected to the second light source unit 161 is disposed in an edge region of the bottom cover 180 to remove the dark portions generated in the corner areas of the LCD device 200 Respectively. Therefore, each of the second light source unit 161 and the third light source unit 162 has the same number as the number of the corners of the bottom cover 180. For example, when the bottom cover 180 has a quadrangular structure, the number of the second light source unit 161 and the number of the third light source unit 162 may be four, since four cone units are provided.

The light emitting holes 170c of the reflection plate 170 are formed to correspond to the first and second light emitting packages 160a and 161a disposed on the first and second light source units 160 and 161, When the first and second light emitting packages 170 and 170 are disposed on the inner surfaces of the first and second printed circuit boards 160b and 161b and the bottom cover 180, 160a, and 161a are exposed to the outside.

The light amount control unit 170b formed in the edge region of the reflection plate 170 corresponds to the third light source unit 162 disposed in the corner area of the bottom cover 180, Thereby adjusting the amount of light traveling to the diffusion plate 131.

A plurality of slit patterns are formed in the light amount adjusting unit 170b so as to control the amount of light transmitted through the third light source unit 162 in the upward direction. The transmissive amount of the light generated in the third light source part 162 is changed according to the width of the slit patterns and the interval of the slit patterns so that the brightness of the corner area and the center area of the liquid crystal display panel 110 can be uniformly adjusted .

As described above, in the backlight unit and the liquid crystal display device having the same according to the present invention, a part of the printed circuit board on which the light emitting packages are mounted is separated and the light emitting package is disposed in the area corresponding to the corner of the liquid crystal display panel, Thereby eliminating the luminance defects generated in the display device.

A backlight unit and a liquid crystal display device having the backlight unit according to the present invention are characterized in that a light emitting package is disposed in an area corresponding to an edge of a liquid crystal display panel and a light amount control unit formed integrally with a reflection plate is disposed on the light emitting package, It has the effect of eliminating a hot spot defect occurring at the corner of the display panel.

4 and 5 are views showing a light source area of a backlight unit according to the present invention.

4 and 5, the backlight unit 120 of the present invention includes a first group GP1 including two first light source units 160 inside the bottom cover 180, 1 to the third light source units 160, 161, and 162 are alternately arranged.

The first light emitting package 160a of the first light source unit 160 may include a plurality of second light emitting packages 161a and 162a disposed in the second light source unit 161 and the third light source unit 162, It is equal to the sum of the numbers. Particularly, the number of the third light emitting packages 162a of the third light source unit 162 may be selected from the number of the first light emitting packages 160a disposed in the first light source unit 1601, 2 light emitting packages 161a.

The third light emitting package 162a is disposed in the four corner regions (X region) of the bottom cover 180. [

Since five first light emitting packages 160a are disposed on the first printed circuit board 160b of the first light source unit 160 as shown in the drawing, ten light emitting packages are all included in the first group GP1 To form a single String.

The second group GP2 includes five light emitting packages arranged in the first light source section 160 and four light emitting packages arranged in the second light source section 161 and one light emitting package arranged in the third light source section 162 And 10 light emitting packages are mounted as in the first group GP1. The second light source unit 161 in which the four second light emitting packages 160b are disposed is electrically connected to the third light source unit 162 in which one third light emitting package 162a is disposed.

Accordingly, in the backlight unit 120 of the present invention, since the number of the light emitting packages disposed in the first group GP1 and the second group GP2 is the same, the driving voltage supplied from the inverter to drive the backlight unit 120 There is no change.

As described above, the present invention has the effect of improving the brightness deficiency generated in the corner area of the liquid crystal display panel without changing the driving unit (inverter, etc.) of the conventional backlight unit 120. [

As described above, when 10 light emitting packages are mounted as one string, at least four of the second group G2 must be disposed so that the third light source part 162 The third light emitting package 162a may be disposed.

Accordingly, when the backlight unit 120 is formed of four strings, four second groups GP2 formed of the first through third light sources 160, 161 and 162 are disposed in the bottom cover 180 do.

As described above, when four of the second groups GP2 are disposed in the bottom cover 180, the third light source portion 162 of the second group GP2 is disposed in the four corner areas of the bottom cover 180 In the central region, the first light source unit 160 and the second light source unit 161 form a pair and are alternately arranged to realize a uniform luminance in the central region. Therefore, the third light source unit 162 must be disposed at the four corner areas of the bottom cover 180, and therefore at least four third light source units 162 must be present. Due to the third light source unit 162, There are four second light source units 161 that are the same as the number of the corners of the bottom cover 180. [ Accordingly, the first light source unit 160 and the second light source unit 161, which are different in the number of mounted light emitting packages, may exist in the central region of the bottom cover 180, resulting in a luminance unbalance. In order to prevent such a problem, the first light source unit 160 and the second light source unit 161 disposed in the central region of the bottom cover 180 are arranged to be alternately arranged in the horizontal or vertical direction, To prevent non-uniformity.

When the backlight unit 120 is composed of five strings, the first group GP1 and the second group GP2 are arranged in a pair. In this case, the first group GP1 is disposed on the upper or lower edge of the bottom cover 180 so that the first and second light source units 160 and 161 constituted by the second group GP2 are alternately arranged do.

4, when the backlight unit 120 is composed of six strings, the first group GP1 and the second group GP2 may be formed of two strings, The first group GP1 is disposed on the upper side and the first group GP1 on the lower side.

The first and second light source units 160 and 161 included in the second groups GP2 are disposed in the central region of the bottom cover 180, They are arranged alternately from the upper side to the lower side of the bottom cover 180.

As described above, in the present invention, the third light source unit 162 is disposed in the area corresponding to the edge areas of the liquid crystal display panel, and the first light source unit 160 and the second light source unit 161 So that the second light source unit 161, which has a relatively small number of the light emitting packages, is not caused to cause uneven brightness.

Accordingly, the first and second light sources 160 and 161 of the second group GP2 are positioned in a central region of the bottom cover 180, and the first and second light sources 160 and 161 And the first and second light source units 160 and 161 included in the second group GP2 in the vertical direction are alternately arranged.

That is, when viewed from only the first or second light source units 160 and 161 included in the plurality of second groups GP2, the first or second light source units 160 and 161 are arranged in the zigzag direction, So as to minimize the luminance imbalance that may occur. This is because the number of the light emitting packages to be mounted on the first light source unit 160 and the second light source unit 161 disposed in the central region of the bottom cover 180 is different and the first and second light source units 160 and 161 So that luminance can be compensated to realize a uniform luminance.

 As described above, in the present invention, the number of the light emitting packages of the second group GP2 composed of the first group GP1 of the pair of first light source units 160 and the first to third light source units 160, 161 and 162 The currents flowing in the respective groups are the same. That is, since the light emission amounts of the light emitting packages are all the same, uniform luminance can be ensured only by the arrangement relationship described above.

As described above, in the present invention, the second light source unit 161 of the second group and the third light source units 162 connected by the power supply line PL are disposed in four corners of the liquid crystal display device 200, There is an effect of improving the luminance deficiency that has occurred in the corner area of the device 200. [

A backlight unit and a liquid crystal display device having the backlight unit according to the present invention are characterized in that a light emitting package is disposed in an area corresponding to an edge of a liquid crystal display panel and a light amount control unit formed integrally with a reflection plate is disposed on the light emitting package, It has the effect of eliminating a hot spot defect occurring at the corner of the display panel.

In addition, a backlight unit and a liquid crystal display device having the same according to the present invention may be configured such that a light emitting package is disposed in a region corresponding to an edge of a liquid crystal display panel by separating a part of a printed circuit board on which light emitting packages are mounted, There is an effect that luminance unevenness phenomenon generated in the corner area of the liquid crystal display panel is eliminated without changing the driving voltage supplied to the light emitting packages by alternately arranging the printed circuit boards having different numbers of the light emitting packages.

FIG. 6 is a cross-sectional view of a liquid crystal display device according to the present invention, FIGS. 7A and 7B are views showing the structure of a light emitting package arranged at the center and a corner region of the liquid crystal display device of the present invention, FIGS. 9A and 10B are views showing a state in which the amount of light is adjusted according to the structure of the light amount control unit formed on the reflection plate of the present invention.

6 to 10B, the liquid crystal display of the present invention includes first to third light sources 160, 161 and 162 arranged inside a bottom cover 180, and first to third light sources 160, A light amount adjusting unit 170b and a light emitting hole 170c are mounted on the light guide plate 161,

The reflector 170a of the reflector 170 is attached to the first and second printed circuit boards 160b and 161b of the first and second light sources 160 and 161, The first and second light emitting packages 160a and 161a mounted on the printed circuit boards 160b and 161b are exposed to the outside through the light emitting holes 170c formed in the reflective portion 170a.

The bottom cover 180 is disposed on the third light source unit 162 so that the light amount control unit 170b of the reflection plate 170 has a predetermined inclination.

As described above, the first and second light emitting packages 160a and 161a included in the first and second light source units 160 and 161 have the reflective portion 170a of the reflection plate 170 disposed therebelow, The third light emitting package 162b of the light source unit 162 has the light amount control unit 170b located thereon.

Therefore, in the present invention, the reflection type lenses are disposed in the first and second light emitting packages 160a and 161a of the first and second light source units 160 and 161 disposed in the central region of the bottom cover 180, And a refraction type lens is disposed in the third light emitting package 162a of the third light source part 162. [

7A and 7B, the third light source unit 162 includes a third printed circuit board 162b and a third light emitting package 162a disposed on the third printed circuit board 162b do. The third light emitting package 162a includes a light emitting chip 162a_2 composed of light emitting diodes and a refraction type lens 162a_1 disposed on the light emitting chip 162a_2.

The refraction type lens 162a_1 has a convex surface S1 having a convex surface and the light generated from the light emitting chip 162a_2 is directed upward in the third light emitting package 162a, In the direction in which they are arranged.

7B, the first light source unit 160 is shown. However, the second light source unit 161 also has the same structure. The first light source unit 160 includes a first printed circuit board 160a and a first light emitting package 160a disposed on the first printed circuit board 160b. The first light emitting package 160a includes a light emitting chip 160a_2 including light emitting diodes and a reflective lens 160a_1 disposed on the light emitting chip 160a_2.

The reflective lens 160a_1 has a concave surface S2 having a concave surface so that the light generated from the light emitting chip 160a_2 is reflected toward the lower side of the first light emitting package 160a_1, In the direction in which the reflection portion 170a of the light guide plate 170 is disposed.

In general, the refraction type lens 162a_1 is used in a liquid crystal display device having a thick liquid crystal display panel, and the refraction type lens 162a_1 can refract the light generated from the light emitting chip 162a_2 It is because.

In addition, the reflective lens 160a_1 is used in a slim liquid crystal display device having a thin liquid crystal display panel. The reflective lens 160a_1 is a structure in which light generated from the light emitting chip 160a_2 is incident on the liquid crystal display device This is because the light is reflected in the reflective region 170a in order to compensate for the disadvantage that the light traveling distance is reduced.

A third light source 162 having the refraction type lens 162a_1 is disposed in a region corresponding to an edge region of the liquid crystal display panel 110 and a reflection type lens 160a_1 is provided in a region corresponding to the center region, The first and second light sources 160 and 161 having the first and second light sources 160 and 161 are disposed to secure the luminance in the central area of the liquid crystal display panel 100 while preventing the luminance from being reduced in the corner areas.

8, a first light source 160 is disposed in a region corresponding to a central region of the liquid crystal display panel 110, and a first light emitting package 160a of the first light source 160 is disposed in a region The third light L3 is filled with the reflected light reflected by the reflection portion 170a of the reflection plate 170. The reflection light of the third light L3 is reflected by the reflection portion 170a of the reflection plate 170,

However, as the liquid crystal display device becomes larger and slimmer, the light does not propagate to the corner area of the liquid crystal display device only by the light emitting package including the reflective lens 160a_1, and dark parts are generated in the corner area.

The second light source 161 disposed in the region corresponding to the central region of the liquid crystal display panel 110 also emits the third light L3 which is the same as the first light source 160,

A third light source 162 having the refraction type lens 162a_1 is disposed at an edge region of the bottom cover 180 corresponding to an edge area of the liquid crystal display panel 110. The third light source 162 A light amount control unit 170b formed integrally with the reflection plate 170 is positioned.

Therefore, the first light L1 generated from the third light source 162 is adjusted to the second light L2 while passing through the light amount adjusting unit 170b. The third light source 162 includes a refraction type lens 162a_1 in which light propagates upward and a hot spot is visible in an edge region of the liquid crystal display panel 110. However, And the second light L2 having a constant brightness is transmitted to the diffusion plate 131 by the light emitting portion 170b.

As described above, in the present invention, in order to compensate for the light which can not proceed to the edge region, the light emitting packages having the reflective lens are used as the light source of the liquid crystal display, By arranging the package, the luminance unevenness is improved.

The degree to which the amount of light is adjusted by the first light L1 passing through the light amount adjusting unit 170b and the amount of the second light L2 differs depending on the structure of the light amount adjusting unit 170b shown in FIGS. 9A and 10A .

As shown in FIG. 9A, a plurality of first slit patterns SP1 may be formed in the light amount control unit 170b. The first slit pattern SP1 may have a first width W1 and the first slit patterns SP1 may have a first interval D1.

On the other hand, in FIG. 10A, the light amount control unit 170b may be formed in a plurality of second slit patterns SP2. The second slit patterns SP2 may have a second width W2 and the second slit patterns SP2 may have a second spacing D2.

When the first width W1 of the first slit pattern SP1 is larger than the second width W2 of the second slit pattern SP2, as shown in FIGS. 9B and 10B, the third light source 162 The amount of the first light L1 to be emitted is adjusted by the second light of the X1 light and the X2 light.

Since the X1 light has passed through the light amount adjusting portion 170b having a larger width of the slit pattern than the X2 light, the light amount of the X1 light is larger than the light amount of X2 and the luminance is high.

The first and second slits D1 and D2 of the first and second slit patterns SP1 and SP2 formed in the light amount control unit 170b are separated from the third light source 162, The amount of light of one light L2 can be adjusted.

Since the light transmittance is low as the interval between the first and second slit patterns SP1 and SP2 is narrowed, the light amount of the light passing through the light amount regulator 170b is reduced. When the interval is wide, The light amount of the light passing through the adjustment portion 170b becomes large.

That is, since the light amount control unit 170b is structurally located above the third light source 162 in the corner area of the liquid crystal display of the present invention, the third light emitting package 162a having the refraction type lens for emitting light in the upward direction The light emitting packages provided with the reflection type lenses disposed in the central region of the liquid crystal display device can be supplemented.

FIGS. 11A to 11D are diagrams showing various structures of the light amount control unit of the reflector disposed in the backlight unit of the present invention, and FIG. 12 is a diagram showing a state in which the brightness unevenness is improved in the corner area of the liquid crystal display of the present invention.

11A to 11D illustrate structures of the light amount control unit. As shown in FIG. 11A, a light amount control unit 170b (see FIG. 11A) in which square first holes H1 are formed in a matrix form is formed in a corner area of a reflection unit 170a of a reflection plate. A light amount adjusting unit 170b in which the second holes H2 having a predetermined diameter are centered and the density of the second holes H2 is changed toward the edge direction about the center area, Can be formed.

The first hole H1 in FIG. 11A has a rectangular structure and is formed in the same area as the light amount control portion 170b. However, the first hole H1 may have a different size. For example, in the region corresponding to the third light source 162 in FIG. 6, the size of the first hole H1 may be small, and in other regions, the size of the first hole H1 may be sequentially increased. In some cases, it may be formed in the opposite form.

The diameter of the second holes H2 in the region corresponding to the third light source 162 of FIG. 6 may be smaller than the diameter of the second holes H2, But can be formed in a shape in which the diameter gradually increases in the other areas.

Since the third light source 162 of FIG. 6 includes the refracting lens, a hot spot having the highest light amount is generated in a region overlapping with the third light source 162 in a direction perpendicular to the third light source 162 So that the light amount is canceled as much as possible so that the luminance unevenness does not occur in the region corresponding to the light amount regulating portion 170b.

11C, a plurality of slit patterns S may be formed in a plurality of rows, and the width of the slit pattern S may be increased toward both sides with respect to the center of the diagonal line, have.

In FIG. 11D, the light amount control unit 170b may be formed using a light transmitting material different from the reflecting unit 170a of the reflection plate. The light amount adjusting unit 170b may be formed by mixing a plurality of light scattering agents M with a light transmitting material such as a diffusion plate or an optical sheet.

Accordingly, the light generated from the light source disposed below the light amount control unit 170b is transmitted through the light amount control unit 170b, and the amount of light is adjusted by the light scattering material M, It is possible to improve the luminance deficiency of the display device.

12 (a), 10 (b) and 11 (a) to 11 (d) are arranged in corner areas of the reflector so as to correspond to the corner areas of the liquid crystal display panel, It can be seen that the dark areas or the brightness non-uniformity phenomenon does not occur in the four diagonal areas T1, T2, T3 and T4 of the liquid crystal display panel.

As described above, in the backlight unit and the liquid crystal display device having the same according to the present invention, a part of the printed circuit board on which the light emitting packages are mounted is separated and the light emitting package is disposed in the area corresponding to the corner of the liquid crystal display panel, Thereby eliminating the luminance defects generated in the display device.

A backlight unit and a liquid crystal display device having the backlight unit according to the present invention are characterized in that a light emitting package is disposed in an area corresponding to an edge of a liquid crystal display panel and a light amount control unit formed integrally with a reflection plate is disposed on the light emitting package, It has the effect of eliminating a hot spot defect occurring at the corner of the display panel.

In addition, a backlight unit and a liquid crystal display device having the same according to the present invention may be configured such that a light emitting package is disposed in a region corresponding to an edge of a liquid crystal display panel by separating a part of a printed circuit board on which light emitting packages are mounted, There is an effect that luminance unevenness phenomenon generated in the corner area of the liquid crystal display panel is eliminated without changing the driving voltage supplied to the light emitting packages by alternately arranging the printed circuit boards having different numbers of the light emitting packages.

110: liquid crystal display panel
120: Backlight unit
130: Optical sheet
131: diffusion plate
160: first light source part
161:
162: Third light source part
170: reflector
170a:
170b:
170c: light emitting hole
180: Bottom cover

Claims (16)

Bottom cover;
First and second light sources disposed in a central region of the bottom cover and having different numbers of light emitting packages;
A third light source disposed in an edge area of the bottom cover; And
And a light amount adjusting unit disposed on the third light source unit.
The apparatus of claim 1, wherein the first to third light sources are divided into a first group including a pair of first light sources and a second group including the first through third light sources, The number of the light emitting packages of the backlight unit being equal to each other.
The backlight unit according to claim 1, wherein the number of the second light source unit and the number of the third light source unit are the same as the number of corners of the bottom cover, respectively.
The light emitting device according to claim 1, wherein the light emitting packages disposed on the first and second light source portions include reflective lenses each having a concave surface, and the light emitting package disposed on the third light source portion includes a refraction type lens .
The backlight unit of claim 1, further comprising a reflection plate integrally formed on the bottom cover.
The light emitting device according to claim 1, wherein light of the light emitting packages arranged in the first and second light source portions travels in a downward direction of the first and second light source portions, A backlight unit that travels upward in the light source unit.
The backlight unit of claim 1, wherein the light amount controller includes a plurality of slit patterns.
The backlight unit according to claim 7, wherein light emitted from the third light source portion varies in light quantity of light passing through the slit pattern according to a width of the slit pattern.
A liquid crystal display panel; And
And a backlight unit for supplying light to the liquid crystal display panel,
The backlight unit includes:
A bottom cover,
First and second light sources disposed in a central region of the bottom cover and having different numbers of light emitting packages,
A third light source unit disposed in an edge area of the bottom cover,
And a light amount adjusting unit disposed on the third light source unit.
The apparatus of claim 9, wherein the first to third light sources are divided into a first group including a pair of first light sources and a second group including the first through third light sources, The number of the light emitting packages of the liquid crystal display device being equal to each other.
The liquid crystal display of claim 9, wherein the number of the second light source unit and the number of the third light source unit are equal to the number of the corners of the bottom cover, respectively.
The light emitting device according to claim 9, wherein the light emitting packages arranged on the first and second light source portions include reflection lenses each having a concave surface, and the light emitting package arranged on the third light source portion includes a refraction type lens And the liquid crystal display device.
The liquid crystal display of claim 9, further comprising a reflector formed integrally with the light amount controller on the bottom cover.
10. The light emitting device according to claim 9, wherein light of the light emitting packages arranged in the first and second light source portions travels downward of the first and second light source portions, The liquid crystal display device advances toward the upper side of the light source portion.
The liquid crystal display of claim 9, wherein the light amount controller includes a plurality of slit patterns.
16. The liquid crystal display of claim 15, wherein light emitted from the third light source portion is a light amount of light passing through the slit pattern in accordance with a width of the slit pattern.

Images