KR101667791B1 - Light emitting diode and liquid crystal display device including the same - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light emitting diode, and more particularly, to a light emitting diode having an improved directivity angle of light.
A feature of the present invention is that the side wall of the long side edge of the side wall of the LED is concave from the LED chip and the side wall of the short side edge is convex toward the LED chip.
Thus, the light efficiency of the LED can be improved and the light directing angle of the short edge of the LED can be improved.
In addition, it is possible to prevent the occurrence of dark portions in the light-guiding plate light-incident portion where light can not pass through between adjacent LEDs. Therefore, it is possible to prevent the LED mura phenomenon from occurring, and furthermore, it is possible to prevent the display quality of the liquid crystal display device from deteriorating due to the luminance unevenness.

Description

[0001] The present invention relates to a light emitting diode (LED) and a liquid crystal display (LCD)

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light emitting diode, and more particularly, to a light emitting diode having an improved light directing angle.

In recent years, the use of light emitting diodes (LEDs) having features such as small size, low power consumption and high reliability as light sources has been increasing. Such LEDs have been used for various lighting purposes, and their use ranges from display of electronic products to various display devices, lighting devices of vehicles, and the like.

In particular, the LEDs artificially generate white light to replace fluorescent lamps for general illumination, and the LEDs that emit white light are receiving the spotlight as a backlight unit of a liquid crystal display (LCD).

1 is a cross-sectional view of a typical LED that implements white light.

The LED chip 11 is placed on the heat dissipating slug 15 and the heat dissipating slug 15 is surrounded by the case 13 serving as a housing.

The case 13 is provided with a pair of positive and negative electrode leads 17a and 17b which are electrically connected to each other through the LED chip 11 and the wire 18 and are exposed to the outside of the case 13.

A pair of positive / negative electrode leads 17a and 17b are electrically connected to a current supplying means (not shown) for supplying an operating current provided outside for emitting the LED chip 11. [

The case 13 is configured to have a side wall 13a that protrudes upward and upward along the side surface of the heat dissipating slug 15, and the inner side surface of the side wall 13a forms a reflecting surface.

The side wall 13a serves to block or forwardly reflect light generated laterally from the LED chip 11 and to form a region filled with the transparent resin 19 therein.

The transparent resin 19 is made of a mixture of silicon (not shown) and a fluorescent material (not shown) so that the light emitted from the LED chip 11 and the light emitted by the fluorescent material (not shown) So that the white light is emitted to the outside.

That is, the transparent resin 19 filled in the side wall 13a protects the LED chip 11 and controls the angle of the main emission light generated from the LED chip 11.

At this time, when the LED chip 11 generates blue light and the phosphor (not shown) of the transparent resin 19 is a yellow phosphor, the light ultimately generated from the LED 10 becomes white light.

The light emitted from the LED chip 11 is absorbed and scattered in the LED 10 according to the structure of the LED 10 so that the amount of light generated from the LED chip 11 The amount of light emitted to the light source becomes low.

Therefore, the light efficiency of the LED 10 is reduced.

The light emitted from the LED 10 is emitted so as to have a constant directivity angle. The LED that emits the light to emit light so as to have a constant directivity angle is formed by the light emitted from two or three neighboring LEDs 10, In the process of being incident on the light guide plate (not shown) after being superimposed and mixed, dark portions are generated in the light-incident portion of the light guide plate (not shown).

As a result, an LED mura phenomenon occurs, and further, the display quality of the liquid crystal display device deteriorates due to unevenness in luminance.

In order to solve this problem by reducing the distance between the LED 10 and the LED 10 adjacent to the LED 10, there is a problem of cost increase and heat dissipation due to an increase in the number of the LED 10, And furthermore, the power consumption is increased.

Further, a lightweight and thin liquid crystal display device can not be realized.

SUMMARY OF THE INVENTION It is a first object of the present invention to provide an LED having improved light efficiency.

Another object of the present invention is to provide a lightweight and thin liquid crystal display device and to solve defects such as LED mura and the like and to prevent a problem of deterioration of display quality due to uneven brightness of the liquid crystal display device This is the third purpose.

In order to achieve the above-mentioned object, the present invention provides a heat exchanger comprising: a heat dissipating slug; An LED chip mounted on the heat dissipating slug; A case disposed on the heat dissipating slug and having first to fourth upwardly projecting sidewalls spaced from each other at an edge of the LED chip; The first and third sidewalls facing each other are concave toward the LED chip, the first and the second sidewalls facing each other are concave toward the LED chip, And the second and fourth sidewalls, which are perpendicular to the first and third sidewalls and face each other, provide a light emitting diode which is convex toward the LED chip.

At this time, the first to fourth sidewalls have a curvature, and the first and third sidewalls are longer than the second and fourth sidewalls.

The directional angle of light viewed toward the direction in which the second and fourth side walls are formed is narrower than the directional angle of light viewed toward the direction in which the first and third side walls are formed, And the phosphor is mixed.

Here, the LED chip is a blue LED chip, the phosphor is a yellow phosphor, the LED chip is a UVLED chip, and the phosphors are red (R), green (G), and blue (B) phosphors.

The present invention also relates to a method of manufacturing a semiconductor device, A reflector resting on the cover bottom; A light guide plate mounted on the reflection plate; A bar-shaped printed circuit board disposed on the same plane as the light-incident portion of the light guide plate; A heat dissipating slug mounted on the printed circuit board at a predetermined interval; An LED chip mounted on the heat dissipating slug; A case disposed on the heat dissipating slug and having first to fourth upwardly projecting sidewalls spaced from each other at an edge of the LED chip; The first and third sidewalls facing each other are concave toward the LED chip, the first and the second sidewalls facing each other are concave toward the LED chip, 1 and the third sidewall and the second and fourth sidewalls facing each other, the LED assembly including a light emitting diode that is convex toward the LED chip; A plurality of optical sheets interposed on the light guide plate; A support main body covering the reflection plate, the light guide plate, and the edges of the plurality of optical sheets; A liquid crystal panel disposed on the plurality of optical sheets, a top cover covering an upper edge of the liquid crystal panel and coupled to the support main and cover bottoms, And the longitudinal direction of the light guide plate corresponds to the longitudinal direction of the light entrance portion of the light guide plate.

The directing angle of light viewed toward a direction in which the first and third sidewalls are formed corresponds to the light incident portion of the light guide plate, and the directivity angle of light viewed toward the direction in which the second and fourth sidewalls are formed, 1 and the third sidewall are formed.

As described above, according to the present invention, the sidewall of the long side of the sidewall of the LED is concave toward the LED chip, and the short side sidewall is convex toward the LED chip, thereby improving the light efficiency of the LED. It is possible to improve the directivity angle of the light viewed from the major axis direction of the light source.

In addition, there is an effect that it is possible to prevent the occurrence of dark portions in the light-guiding plate light-incident portion where light does not reach the adjacent LEDs.

This has the effect of preventing the LED mura phenomenon from occurring and further preventing the display quality of the liquid crystal display device from deteriorating due to the luminance unevenness.

1 is a cross-sectional view of a typical LED that implements white light.
2 is a perspective view of an LED according to an embodiment of the present invention;
Figs. 3A-3B are cross-sectional views of the LED according to the embodiment of Fig. 2 as viewed in the major and minor axes. Fig.
4A-4B are simulation results showing the light directing angles of the shortened edge of the LED according to the general LED and the embodiment of the present invention.
5 is a sectional view of a liquid crystal display module including an LED according to an embodiment of the present invention;
FIGS. 6A and 6B are views schematically showing a state in which light emitted from a general LED and an LED according to an embodiment of the present invention is incident into a light guide plate through a light guide plate light-incident portion. FIG.

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

2 is a perspective view of an LED according to an embodiment of the present invention.

As shown in the figure, the LED 100 includes an LED chip 111 that emits light and a lens unit 120 that controls the angle of the main emission light generated from the LED chip 111.

More specifically, first, the LED chip 111 is placed on the heat dissipating slug 115. The heat dissipating slug 115 is a part for conducting and discharging high-temperature heat accompanying the light emission of the LED chip 111 to the outside, .

The heat dissipating slug 115 is provided to have a seating portion drawn to a predetermined depth from the surface so that the LED chip 111 is seated.

The heat dissipation slug 115 is surrounded by a case 113 serving as a housing and a pair of positive and negative electrode leads 115 electrically connected to the LED chip 111 through a wire 118, (117a, 117b) are provided and exposed to the outside of the case (113).

 At this time, a current supply means (not shown) for supplying a power source (+) for emitting light of the LED chip 111 and a ground power source (-) is provided outside and electrically connected to the anode and cathode leads 117a and 117b .

The case 113 is configured to have side walls 200a, 200b, 200c, and 200d projecting upwardly and upwardly along the side surface of the heat dissipating slug 115. The inner side surfaces of the side walls 200a, 200b, 200c, It makes amnesty.

The side walls 200a, 200b, 200c, and 200d may be made of a transparent material having high reflection efficiency, a translucent diffusion material, or an opaque reflective material. At this time, A transparent synthetic resin such as acrylic having a transmittance of 90% or more can be used.

A synthetic resin molding having a transmittance of about 50 to 90% may be used as a semitransparent diffusion material. For example, a diffusion agent for a material particle having a reflection characteristic at the time of injection molding of PMMA (poly methyl methacrylate) Can be expressed.

As opaque reflective material, metals with high surface reflectance such as Al can be used.

Accordingly, the side walls 200a, 200b, 200c, and 200d serve to block or forwardly reflect light emitted from the LED chip 111. Here, the side walls 200a, 200b, 200c, The side walls 200a, 200b, 200c and 200d are formed of first to fourth side walls 200a, 200b, 200c and 200d so as to surround the LED chip 111. At this time, The first and third sidewalls 200a and 200c located at one edge (hereinafter referred to as the long axis edge) are formed to have a concave and constant curvature toward the LED chip 111, and are parallel to the short axis of the LED 100 The second and fourth sidewalls 200b and 200d located at the edges (hereinafter referred to as shortened edge portions) are formed to have a convexly curved shape toward the LED chip 111. [

As a result, the LED 100 of the present invention can improve the light directing angle in the long axis direction and further improve the light efficiency. Let me take a closer look at this later.

The first to fourth sidewalls 200a, 200b, 200c and 200d serve to block or forwardly reflect the light emitted laterally from the LED chip 111 and to fill the inside with a transparent resin 119 Thereby forming an area to be formed.

That is, a storage space is defined on the LED chip 111 by the first to fourth sidewalls 200a, 200b, 200c, and 200d formed to surround the LED chip 111, and the transparent resin 119 are filled to form a lens unit 120 for controlling the angle of the main emission light of the LED 100. [

In this case, the transparent resin 119 includes a phosphor (not shown), and a phosphor (not shown) may be mixed with a transparent epoxy resin (not shown) or a silicone resin (not shown) at a certain ratio.

The epoxy resin (not shown) has a relatively large hardness value to cause disconnection of the wire 118 electrically connecting the LED chip 111 to the anode and the cathode leads 117a and 117b and epoxy resin (not shown) Or a yellowing of the visible light due to the absorption of light by the short-wavelength visible light ray caused by the visible light.

In recent years, silicone (not shown), which has a small hardness and a large restoring force, reduces the occurrence of disconnection of the wire 118 and does not show a yellowing tendency due to long use.

The phosphor (not shown) is a yellow phosphor when the LED chip 111 is a blue LED chip, the yttrium (Y) aluminum (Al) garnet doped with cerium (Ce) having a wavelength of 530 to 570 nm as a main wavelength, It is preferable to use a YAG: Ce (T3Al5O12: Ce) phosphor.

When the LED chip 111 is a UVLED chip, the phosphor (not shown) is composed of three phosphors of red (R), green (G) and blue (B) And the fluorescent material 240 of the fluorescent material (B).

Here, the red (R) phosphor is a YOX (Y2O3: EU) based phosphor composed of a compound of yttrium oxide (Y2O3) and europium (EU) having a main wavelength of 611 nm and the green (G) (LaPo4: Ce, Tb) phosphor, which is a compound of phosphorus (Po4) and lanthanum (La) and terbium (Tb) having a dominant wavelength as a main wavelength, and a blue phosphor (B) BAM blue (BaMgAl 10 O 17: EU) based phosphor which is a compound of Eu and Eu and a substance of magnesium oxide and aluminum oxide are preferably used.

Here, the dominant wavelength is the wavelength at which the highest luminance is generated in red (R), green (G), and blue (B), respectively, as the dominant wavelength of the phosphor.

When the power source (+) and the ground power source (-) are supplied to the LED chip 111 through the pair of lead frames 117a and 117b, the LED chip 111 emits light. A part of the emitted light excites a phosphor (not shown) of the transparent resin 119 to mix with the light emitted by the phosphor (not shown) to emit white light, and the white light is emitted to the outside of the LED 100 do.

As described above, the LED 100 according to the embodiment of the present invention is configured such that the side walls 200a and 200c of the long axis edge of the LED 100 are concave toward the LED chip 111, By forming the edge sidewalls 200b and 200d to be convex toward the LED chip 111, it is possible to improve the light efficiency of the LED 100 and improve the directivity angle of the light viewed from the long axis direction of the LED 100 have.

FIG. 3A is a cross-sectional view of the LED according to the embodiment of the present invention shown in FIG. 2 taken along the major axis, and FIG. 3B is a cross-sectional view illustrating the LED according to the embodiment of FIG.

As shown in the drawing, the LED 100 according to the embodiment of the present invention is configured such that the LED chip 111 is seated on the heat dissipating slug 115 and the heat dissipating slug 115 is mounted on the case 113 as a housing .

The case 113 is provided with a pair of positive and negative electrode leads 117a and 117b which are electrically connected to each other through the LED chip 111 and the wire 118 and are exposed to the outside of the case 113. The case 113 The side walls 200a, 200b, 200c, and 200d define the storage space, and the inner side surfaces thereof are formed to have a height It forms a reflective surface.

The storage space defined by the side walls 200a, 200b, 200c, and 200d is filled with a transparent resin 119 mixed with a fluorescent material to control the angle of the main emission light of the LED 100. [

3A, the second and fourth sidewalls 200b and 200d, which are the short axis edges of the LED 100 among the sidewalls 200a, 200b, 200c and 200d of the LED 100, And the first and third side walls 200a, 200b, 200c, and 200d, which are the long axis edges of the LED 100, of the side walls 200a, 200b, 200c, and 200d of the LED 100 are formed so as to have a convexly curved shape, And 200c are concavely curved toward the LED chip 111 so that the light generated from the LED chip 111 has a further improved light efficiency as compared with the normal LED 100. [

The first and third sidewalls 200a and 200c at the edges of the long axis of the LED 100 are formed to have a predetermined curvature toward the LED chip 111, As shown in FIG.

The light emitted from the LED chip 111 is directed more toward the center of the LED 100 by narrowing the angle of the light viewed from the short axis direction of the LED 100, It is possible to broaden the directing angle of the light viewed from the major axis direction.

The light generated from the LED chip 111 is directed toward the center of the LED 100 so that a part of the light generated from the LED chip 111 is incident on the first and third side walls 200a and 200c Thereby preventing absorption and scattering.

Accordingly, since the total light amount emitted from the LED 100 is improved, the light efficiency of the LED 100 is increased.

The LED 100 according to the present invention can be manufactured by joining the second and fourth sidewalls 200b and 200d of the sidewalls 200a, 200b, 200c and 200d of the LED 100 to the LED chip 111 , It is possible to widen the directivity angle of the light viewed from the long axis direction of the LED.

Accordingly, when the LED 100 of the present invention is used as a light source of a liquid crystal display, the color mixing space of light emitted from the plurality of LEDs 100 is increased.

Accordingly, since the lights emitted from the plurality of LEDs 100 are not superimposed and mixed with each other, it is possible to prevent the occurrence of dark portions where light does not reach the areas between neighboring LEDs 100 in the light-incident portion (not shown) have.

This prevents LED mura phenomenon from occurring. Furthermore, it is possible to prevent the display quality of the liquid crystal display device from deteriorating due to the luminance unevenness.

The light emitted from the LED chip 111 is directed toward the central portion of the LED 100 by narrowing the angle of the light viewed from the short axis direction of the LED 100, Positive light can be incident into the light guide plate (not shown), thereby realizing a backlight unit with a further improved light efficiency.

4A to 4B are simulation results showing a light directing angle viewed from a short axis direction of a general LED and an LED according to an embodiment of the present invention.

4A and 4B, the light directing angle viewed from the short axis direction of the LED is substantially equal to the light directing angle seen from the short axis direction of the general LED of FIG. 4A according to the embodiment of the present invention shown in FIG. It can be confirmed that it is narrow.

Accordingly, it can be seen that the LED of the present invention directs a part of the light directed toward the long axis edge of the LED toward the center of the LED.

Accordingly, the LED of the present invention prevents a part of the light generated from the LED chip from being absorbed and scattered by the first and third side walls of the LED, thereby improving the total amount of light emitted from the LED, As shown in FIG.

 In addition, a larger amount of light can be incident into the light guide plate (not shown) through the light guide plate (not shown), thereby realizing a backlight unit with improved optical efficiency.

5 is a cross-sectional view of a liquid crystal display module including an LED according to an embodiment of the present invention.

As shown in the figure, the liquid crystal display module includes a liquid crystal panel 310, a backlight unit 320, a support main 330, a cover bottom 350, and a top cover 340.

First, the liquid crystal panel 310 plays a key role in image display, and includes a first substrate 312 and a second substrate 314 which are bonded to each other with a liquid crystal layer interposed therebetween.

At this time, a plurality of gate lines and data lines intersect with each other on the inner surface of the first substrate 312, which is usually referred to as a lower substrate or an array substrate, though pixels are not shown in the drawings, A thin film transistor (TFT) is provided at each of the intersections of the pixels and is connected in a one-to-one correspondence with the transparent pixel electrodes formed in the pixels.

On the inner surface of the second substrate 314 called an upper substrate or a color filter substrate, a color filter of red (R), green (G), and blue (B) And a black matrix for covering non-display elements such as a gate line, a data line, and a thin film transistor. In addition, a transparent common electrode covering these elements is provided.

Polarizing plates 319a and 319b for selectively transmitting only specific light are attached to the outer surfaces of the first and second substrates 312 and 314, respectively.

A printed circuit board (not shown) is connected to at least one edge of the liquid crystal panel 310 via a connection member (not shown) such as a flexible circuit board or a tape carrier package (TCP) The support main body 330 or the cover bottom 350 is properly brought into close contact with the back surface.

In the liquid crystal panel 310 having the above-described structure, when the thin film transistor selected for each gate line is turned on by the on / off signal of the gate driving circuit to be scanned, the signal voltage of the data driving circuit Line, and the alignment direction of the liquid crystal molecules is changed by the electric field between the pixel electrode and the common electrode, thereby exhibiting a difference in transmittance.

In addition, the liquid crystal display module according to the present invention is provided with a backlight unit 320 for supplying light from the rear surface of the liquid crystal display device module so that the difference in transmittance of the liquid crystal panel 310 is manifested to the outside.

The backlight unit 320 includes an LED assembly 329, a white or silver reflection plate 325, a light guide plate 323 mounted on the reflection plate 325, and a plurality of optical sheets 321 interposed therebetween .

The LED assembly 329 is disposed on one side of the light guide plate 323 so as to face the light incident portion of the light guide plate 323. The LED assembly 329 includes a plurality of LEDs 100, And a PCB 329a mounted at a predetermined interval.

At this time, each of the LEDs 100 is parallel to the longitudinal direction of the PCB 329a, and the short edge of the LED 100 is mounted on the PCB 329a perpendicular to the longitudinal direction of the PCB 329a.

Each of the LEDs 100 includes a side wall (200a, 200b, 200c, 200d, 200b, 200b, 200c, 200d) formed around the LED chip (111 in FIG. 3b) The LED 100 used in the liquid crystal display of the present invention is formed of a transparent resin (119 in FIG. 3B) filled in the LEDs 100a, 200b, 200c, The first and third sidewalls 200a and 200c of FIG. 3B are formed to have a concave curvature toward the LED chip (111 of FIG. 3B), and the second and fourth sidewalls The LEDs 200b and 200d in FIG. 3A are formed so as to have a convexly constant curvature toward the LED chip (111 in FIG. 3B).

At this time, each LED 100 is mounted on the PCB 329a such that the long axis is parallel to the longitudinal direction of the PCB 329a, so that the LED 100 is arranged along the longitudinal direction of the light- The edges are parallel.

Accordingly, the LED 100 of the present invention can improve the directivity angle of the light viewed from the long axis direction, and the color mixing space of the light emitted from the plurality of LEDs 100 can be increased.

Accordingly, since the lights emitted from the plurality of LEDs 100 are not superimposed and mixed with each other, it is possible to prevent the occurrence of dark portions in the light-incident portion of the light guide plate 323 where light can not reach the region between adjacent LEDs 100 .

This prevents the LED mura phenomenon from occurring and further prevents a problem of deterioration of the display quality of the liquid crystal display device due to the luminance unevenness.

3B). By making the light generated from the LED chip (111 in FIG. 3B) be directed toward the center of the LED 100, a part of the light generated from the LED chip (111 in FIG. 3B) Absorbing and scattering by the side walls (200a, 200c in Fig. 3B) is prevented, thereby increasing the total amount of light emitted from the LED 100. [

As a result, the light efficiency of the LED 100 is increased.

Further, by reducing the directivity angle of the light viewed from the short axis direction of the LED 100, a larger amount of light can be incident into the light guide plate 323 through the light incident portion of the light guide plate 323, The backlight unit 320 may be implemented.

At this time, the light guide plate 323 spreads evenly over the wide area of the light guide plate 323 while the light incident from the plurality of LEDs 100 travels through the light guide plate 323 by total reflection several times, to provide.

The light guide plate 323 may include a pattern of a specific shape on the back surface to supply a uniform surface light source.

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

The plurality of optical sheets 321 on the light guide plate 323 include a diffusion sheet and at least one light condensing sheet or the like to diffuse or condense light passing through the light guide plate 323, Allow the light source to enter.

The liquid crystal panel 310 and the backlight unit 320 are modularized through a top cover 340, a support main 330 and a cover bottom 350. The top cover 340 covers the upper surface and the side surface of the liquid crystal panel 310, And the front cover 340 is opened to display an image to be displayed on the liquid crystal panel 310. In this case,

In addition, the cover bottom 350, on which the liquid crystal panel 310 and the backlight unit 320 are mounted and is a basis for assembling the entire structure of the LCD module, is formed into a rectangular plate shape, .

The support main body 330 of a square shape and resting on the cover bottom 350 and covering the edges of the liquid crystal panel 310 and the backlight unit 320 is divided into a top cover 340 and a cover bottom 350, .

Here, the top cover 340 may be referred to as a case top or a top case, and the support main 330 may be referred to as a guide panel or a main support or a mold frame, and the cover bottom 350 may be referred to as a bottom cover.

FIGS. 6A and 6B are views schematically showing a state in which light emitted from a general LED and an LED according to an embodiment of the present invention is incident into a light guide plate through a light guide plate light-incident portion.

6A is a view schematically showing a state in which light emitted from a general LED 10 is incident into a light guide plate 323 through a light incident portion of a light guide plate 323. In the general LED 10, The angle of view of the viewed light is similar.

When the light emitted from the general LED 10 is incident into the light guide plate 323 through the light incident portion of the light guide plate 323, the directivity angle of the light seen from the short axis direction of the LED is widened, Is emitted to a region other than the light-incident portion of the light guide plate 323, light is lost.

On the other hand, as shown in FIG. 6B, the LED 100 of the present invention narrows the directivity angle of the light viewed in the minor axis direction, thereby preventing light loss from occurring compared with the general LED 10 shown in FIG. 6A can do.

Further, by directing a greater amount of light toward the central portion of the LED 100, a larger amount of light is guided into the light guide plate 323 through the light entering portion of the light guide plate 323 It is possible to realize a backlight unit (320 of FIG. 5) having an improved light efficiency.

3B) of the side wall (200a, 200b, 200c, 200d in Fig. 2) of the LED (100 in Fig. 3B) 3B) of the LED chip (100 of FIG. 3B) is formed to be convex from the LED chip (111 of FIG. 3B) 329a in which direction it is mounted.

That is, the LED (100 in FIG. 3B) of the present invention may be formed by concave sidewalls parallel to the longitudinal direction of the PCB (329a in FIG. 5) and vertically formed sidewalls thereof.

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

100: LED, 111: LED chip, 113: case, 115: heat dissipating slug
117a, 117b: positive / negative electrode lead, 118: wire, 119: transparent resin
A lens unit 200, and side walls 200a, 200b, 200c, and 200d (first to fourth side walls)

Claims (10)

A heat dissipating slug;
An LED chip mounted on the heat dissipating slug;
A case disposed on the heat dissipating slug and having first to fourth upwardly projecting sidewalls spaced from each other at an edge of the LED chip;
A first transparent resin layer disposed on the LED chip and filled in the first through fourth sidewalls,
Wherein the first and third sidewalls facing each other are concave toward the LED chip and the second and fourth sidewalls which are perpendicular to the first and third sidewalls and facing each other are convex toward the LED chip, In addition,
Wherein the first to fourth sidewalls have the same height and the transparent resin is completely filled into the first to fourth sidewalls so as to have the same line shape as the first to fourth sidewalls.
The method according to claim 1,
And the first to fourth sidewalls have a curvature.
The method according to claim 1,
Wherein the first and third sidewalls are perpendicular to the height and longer than the second and fourth sidewalls.
The method of claim 3,
Wherein a light directing angle toward a direction in which the second and fourth side walls are formed is narrower than a light directing angle toward a direction in which the first and third side walls are formed.
The method according to claim 1,
Wherein the transparent resin is a mixture of a phosphor and a selected one of epoxy resin or silicone.
The method according to claim 1,
Wherein the LED chip is a blue LED chip, and the phosphor is a yellow phosphor.
The method according to claim 1,
Wherein the LED chip is a UVLED chip, and the phosphor is a red (R), green (G), and blue (B) phosphor.
Cover cover and;
A reflector resting on the cover bottom;
A light guide plate mounted on the reflection plate;
A bar-shaped printed circuit board disposed on the same plane as the light-incident portion of the light guide plate; A heat dissipating slug mounted on the printed circuit board at a predetermined interval; An LED chip mounted on the heat dissipating slug; A case disposed on the heat dissipating slug and having first to fourth upwardly projecting sidewalls spaced from each other at an edge of the LED chip; The first and third sidewalls facing each other are concave toward the LED chip, the first and the second sidewalls facing each other are concave toward the LED chip, 1 and the third sidewall and the second and fourth sidewalls facing each other are convex toward the LED chip,
Wherein the first to fourth sidewalls have the same height and the transparent resin is completely filled into the first to fourth sidewalls so as to have the same line as the first to fourth sidewalls, ;
A plurality of optical sheets interposed on the light guide plate;
A support main body covering the reflection plate, the light guide plate, and the edges of the plurality of optical sheets;
A liquid crystal panel positioned above the plurality of optical sheets;
A top cover which is placed on the top edge of the liquid crystal panel and engages with the support main and cover bottoms,
And the longitudinal direction of the first and third sidewalls of the light emitting diode corresponds to the longitudinal direction of the light-incident portion of the light guide plate.
9. The method of claim 8,
And the light guiding angle of the light toward the direction in which the first and third side walls are formed corresponds to the light incident portion of the light guide plate.
10. The method of claim 9,
Wherein a light directing angle toward the direction in which the second and fourth side walls are formed is narrower than a light directing angle toward the direction in which the first and third side walls are formed.

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