KR20060079686A - Lighting emitting element package, back light assembly having the same, and liquid crystal display device having the same - Google Patents

Abstract

A light emitting device package having an increased emission angle, a backlight assembly having the same, and a liquid crystal display having the same are disclosed. The light emitting device package includes a light emitting device that emits light and a protection member surrounding the light emitting device and having an emission surface for dispersing the emitted light while having a curved shape. Accordingly, the exit angle can be increased by forming the exit surface into a curved surface to disperse the exit light emitted from the light emitting element.

Light emitting element, emitting surface, dark part, protective member, dispersion

Description

LIGHTING EMITTING ELEMENT PACKAGE, BACK LIGHT ASSEMBLY HAVING THE SAME, AND LIQUID CRYSTAL DISPLAY DEVICE HAVING THE SAME}

1A and 1B are a plan view and a perspective view of a light emitting device package according to an embodiment of the present invention.

1C is a view of the optical path of the emitted light in the light emitting device package according to an embodiment of the present invention.

2A and 2B are a plan view and a perspective view of a light emitting device package according to another embodiment of the present invention.

2C is an optical path diagram of emitted light in a light emitting device package according to another exemplary embodiment of the present invention.

3A and 3B are a plan view and a perspective view of a light emitting device package according to a comparative example of the present invention.

3C is an optical path diagram of emitted light in a light emitting device package according to a comparative example of the present invention.

4 is an exploded perspective view of a backlight assembly according to an embodiment of the present invention.

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

<Description of the symbols for the main parts of the drawings>

10 light emitting element 20 protection member

22, 24, 26: exit surface 30: casing portion

50 contact terminal 100 backlight assembly

110, 120, 130: light emitting device package 150: light guide plate

160: reflector 170: optical sheets

180: storage container 200: display unit

300: top chassis 400: rear case

500: front case

The present invention relates to a light emitting device package, and more particularly, to a light emitting device package having an increased emission angle, a backlight assembly having the same, and a liquid crystal display device having the same.

In general, a liquid crystal display device refers to a device for displaying an image by precisely controlling a liquid crystal having a characteristic of changing light transmittance corresponding to an electric field. Thus, the liquid crystal display needs light to display an image. In this case, the liquid crystal display displays an image by using external natural light or artificial light provided from a light source provided therein.                         

As the light source, a light emitting diode (LED), a cold cathode fluorescent lamp (CCFL), a flat fluorescent lamp (FFL), and the like are used. Among the light sources, the cold cathode ray tube lamp and the flat panel fluorescent lamp are mainly employed in a large display device, and the light emitting diode is employed in a small display device.

When the light emitting diode is used as the light source, since the light emitting diode is a kind of point light source, it is difficult to maintain uniformity of brightness of light. In particular, in the edge type backlight assembly, unlike the direct type, it does not generally form a lens for dispersing the light emitted from the light emitting diode.

Therefore, in the place where the light emitting diode is not located, a dark part, which is a blind spot where the emitted light does not reach, is generated, which causes a screen defect.

In order to reduce the dark portion, the number of the light emitting diodes must be increased, the distance between the display area of the liquid crystal display device and the light emitting diodes, or the emission angle of the light emitting diodes must be increased. At this time, since the former two methods have a problem in that the cost or size is increased, it is preferable to devise the latter method of increasing the exit angle.

Accordingly, the technical problem of the present invention has been made in view of the above, an object of the present invention is to provide a light emitting device package with an increased emission angle.

Another object of the present invention is to provide a backlight assembly having the light emitting device package.

Another object of the present invention is to provide a liquid crystal display device having the light emitting device package.

According to one aspect of the present invention, a light emitting device package includes a light emitting device for emitting light and an emission surface for protecting the light emitting device while surrounding the light emitting device, and having a curved shape to disperse the emitted light. It includes a protective member having.

According to another aspect of the present invention, a backlight assembly includes a plurality of light emitting device packages and a light guide plate. The light emitting device packages include a light emitting device that emits light and a protection member that surrounds the light emitting device and protects the light emitting device, and has an curved surface to disperse the emitted light. The light guide plate guides a path of light emitted from the light emitting device package.

According to the light emitting device package and the backlight assembly having the same, dispersion of the emitted light can be facilitated by bending the emission surface formed in the light emitting device package.

According to another aspect of the present invention, a liquid crystal display device includes a backlight assembly and a liquid crystal panel. The backlight assembly has a light emitting device package and a light guide plate. The light emitting device package includes a light emitting device for emitting light and a protection member surrounding the light emitting device to protect the light emitting device and having an curved surface to disperse the emitted light. The light guide plate guides a path of light emitted from the light emitting device package. The liquid crystal panel includes two substrates and a liquid crystal layer formed between the substrates, and displays an image by using light emitted from the backlight assembly.

According to such a liquid crystal display device, the emission angle of the emitted light can be increased, thereby reducing the occurrence of dark portions, thereby realizing a screen state with good characteristics.

Hereinafter, with reference to the accompanying drawings, it will be described in detail the present invention.

1A and 1B are a plan view and a perspective view of a first light emitting device package according to an embodiment of the present invention.

1A and 1B, the first light emitting device package 110 includes a light emitting device 10, a protection member 20, a casing part 30, an electrode 40, and a contact terminal part 50.

The light emitting device 10 generates light. As the light emitting device 10, a light emitting diode is mainly used.

The protective member 20 surrounds and protects the light emitting device 10. Epoxy resin or silicon may be used as the protective member 20.

The light emitting element 10 and the protection member 20 are accommodated by the casing portion 30. The generated light is emitted through one surface of the protection member 20 which is not wrapped by the casing part 30, and one surface of the protection member 20 is called a first emission surface 22.

The first exit surface 22 is a curved surface. The curved surface has a sawtooth shape connected to each other when viewed from the extended surface of the exit surface and serves as a kind of prism. The extended surface of the emission surface is parallel to the surface on which the light emitting device 10 is disposed. In this case, the curved surface may have a shape having an arbitrary polygonal cross section instead of a sawtooth shape. Therefore, the light generated by the light emitting device 10 is dispersed by the first emission surface 22 to proceed.

The electrode 40 transmits power to the light emitting device 10, and an LED substrate (not shown) is connected to the first light emitting device package 110 through the contact terminal 50.

1C is a light path diagram of emitted light in a first light emitting device package according to an embodiment of the present invention.

Referring to FIG. 1C, the first emission light PL1 emitted from the light emitting element 10 passes through the first emission surface 22, which is one surface of the protection member 20, to become the first refractive light RL1. In the drawing, the angle between the first output light PL1 and the first output surface 22 is perpendicular, so that the direction of the first refracted light RL1 is the same as the direction of the first output light PL1. However, if the angle is not vertical, it may be refracted in the x-axis or the y-axis direction perpendicular thereto.

The first refracted light RL1 is refracted while passing through the first exit surface 22 again to become a second refracted light RL2. In this case, since the refractive index of the protective member 20 is greater than the refractive index of the air layer existing outside the protective member 20, the second refractive light RL2 is refracted in the x-axis direction.

The second refractive light RL2 is again emitted to the air layer through the second emission surface. In this case, the second refracted light RL2 is refracted in the x-axis direction to become the third refracted light RL3. As a result, since the first emission light PL1 is refracted twice in the x-axis direction by the first emission surface 22, the first emission light PL1 has many components in the x-axis direction. Therefore, the emission angle which is an angle formed by the first emission light PL1 with the normal line of the first light emitting device package 110 has a large characteristic.

In addition, when the first emission light PL1 is refracted in the x-axis direction while being the first refractive light RL1, the emission angle becomes larger.

2A and 2B are a plan view and a perspective view of a second light emitting device package according to another embodiment of the present invention.

2A and 2B, the second light emitting device package 120 includes a light emitting device 10, a protection member 20, a casing part 30, an electrode 40, and a contact terminal part 50. Compared to FIGS. 1A and 1B, the same reference numerals are assigned to the same parts, and redundant descriptions are omitted.

One surface of the protective member 20 from which light generated by the light emitting device 10 exits is referred to as a second emission surface 24. The second exit surface 24 has a plurality of semi-circular shapes connected to each other when viewed from the extended surface of the exit surface. The extended surface of the emission surface is parallel to the surface on which the light emitting device 10 is disposed. At this time, the second emission surface 24 may have a plurality of arbitrary curves in cross section instead of a plurality of semi-circular shapes. The light generated by the light emitting element 10 is dispersed by the second emission surface 24 and proceeds.

2C is an optical path diagram of the emitted light in the second light emitting device package according to another embodiment of the present invention.

Referring to FIG. 2C, the second emission light PL2 emitted from the light emitting element 10 passes through the second emission surface 24, which is one surface of the protective part 20, to become the fourth refractive light RL4. . In this case, the fourth refracted light RL4 is the second output light PL2 refracted in the x-axis direction. Of course, the second emission light PL2 may be refracted in the y-axis direction according to the position at which the second emission light PL2 is incident on the second emission surface 24.

The fourth refractive light RL4 is further refracted while passing through the second emission surface 24 to become the fifth refractive light RL5. In this case, the fifth refractive light RL5 is refracted in the x-axis direction.

The fifth refracted light RL5 is emitted to the air layer through the second emission surface 24 again. In this case, the fifth refracted light RL5 is refracted in the x-axis direction to become the sixth refracted light RL6.

As a result, the second emission light PL2 is refracted three times in the x-axis direction by the second emission surface 24. Therefore, the second emission light PL2 has a large number of components in the x-axis direction, and thus has a large emission angle.

3A and 3B are a plan view and a perspective view of a third light emitting device package according to a comparative example of the present invention.

3A to 3C, the third light emitting device package 130 includes a light emitting device 10, a protection member 20, a casing part 30, an electrode 40, and a contact terminal part 50. Compared to FIGS. 1A and 1B, the same reference numerals are assigned to the same parts, and redundant descriptions are omitted.

One surface of the protective member 20 from which light generated by the light emitting device 10 exits is called a third emission surface 26. At this time, the third exit surface 26 is flat. Light generated by the light emitting device 10 is reflected and transmitted through the second emission surface 24.                     

3C is an optical path diagram of the emitted light in the third light emitting device package according to the comparative example of the present invention.

Referring to FIG. 3C, the third emission light PL3 emitted from the light emitting element 10 passes through the third emission surface 26, which is one surface of the protection member 20, to become the seventh refractive light RL7. In this case, the seventh refractive light RL7 is the third output light PL3 is refracted in the x-axis direction.

Comparing the embodiments of the present invention with the comparative example, in the comparative example, the third exit surface 26 is flat, and in the embodiments of the present invention, the first and second exit surfaces 22 and 24 are curved surfaces. to be. Therefore, the third output light PL3 is refracted only once in the x-axis direction by the third output surface 26. However, portions of the first and second output light PL1 and PL2 are refracted more than once in the x-axis direction by the first and second output surfaces 22 and 24.

Therefore, in the case of the outgoing light emitted from the light source at the same distance from the first to the third exit surface 22, 24, 26, the first and the second outgoing light PL1, PL2 are the first and the second It is distributed by the two exit surfaces 22 and 24 so that the exit angle is larger than the exit angle of the third exit light PL3.

4 is an exploded perspective view of a backlight assembly according to an embodiment of the present invention.

Referring to FIG. 4, the backlight assembly 100 may include the first light emitting device package 110, the LED substrate 140, the light guide plate 150, the reflector plate 160, the optical sheets 170, and the storage container 180. Include. Compared to FIGS. 1A and 1B, the same reference numerals are assigned to the same parts, and redundant descriptions are omitted.

The plurality of first light emitting device packages 110 are disposed on the LED substrate. In this case, the second light emitting device package 120 illustrated in FIG. 2 may be disposed instead of the first light emitting device package 110.

The first exit surfaces 22 of the first light emitting device packages 110 face one side of the light guide plate 150. Outgoing light passing through the first exit surfaces 22 is incident on one side of the light guide plate 150. The light guide plate 150 guides the emitted light to the optical sheets 180 facing the light guide plate 150.

The reflective plate 160 prevents the light emitted from the first light emitting device package 110 from leaking in a direction in which the light guide plate 150 is not formed.

The optical sheets 170 include a diffusion plate 172 and a prism sheet 174. The diffusion plate 172 diffuses the light emitted from the first light emitting device package 110 and passes through the light guide plate 150, and the prism sheet 174 collects the diffused light.

The storage container 180 includes a bottom member 182 having a portion opened and a side wall member 184 extending vertically from the bottom member 182. The reflecting plate 160, the LED substrate 140, the light guide plate 150, and the optical sheets 170 are sequentially received in the bottom member 182 of the storage container 180.

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

Referring to FIG. 5, the LCD includes a backlight assembly 100, a display unit 200, a top chassis 300, a rear case 400, and a front case 500. Compared with FIG. 3, the same reference numerals are given to the same parts, and description is omitted.

The display unit 200 includes a liquid crystal panel 210 for displaying an image, a plurality of data side and gate side tape carrier packages (TCP) 220 and 230, and an integrated printed circuit board 240. ).

The liquid crystal panel 210 may include an array substrate 212 displaying pixels, a color filter substrate 214 facing the array substrate 212, and between the array substrate 212 and the color filter substrate 214. It includes a liquid crystal layer (not shown) injected into.

The plurality of data side TCPs 220 are attached to a source side of the array substrate 212, and the plurality of gate side TCPs 230 are attached to a gate side of the array substrate 212. The data side and gate side TCPs 220 and 230 apply a driving signal and a timing signal to the liquid crystal panel unit 210 for controlling the driving of the liquid crystal panel unit 210 and the timing of driving the liquid crystal panel unit 210.

The data side TCP 220 has one side attached to the array substrate 212 and the other side attached to the integrated printed circuit board 240 to electrically connect the liquid crystal panel unit 210 with the integrated printed circuit board 240. Connect it. The gate side TCP 230 is attached to the array substrate 212 to electrically connect the liquid crystal panel unit 210 with the integrated printed circuit board 240. The integrated printed circuit board 240 receives an electrical signal from the outside and applies the electrical signal to the data side and the gate side TCPs 220 and 230.

The data side and gate side TCPs 220 and 230 connected to the liquid crystal panel unit 210 are bent along the outer surface of the sidewall member 184 of the storage container 180, and the integrated printed circuit board 240 is formed. Is seated on the back of the bottom member 182.

The top chassis 300 that is a fixing means is provided on the liquid crystal panel 210. The top chassis 300 covers the effective display area of the liquid crystal panel unit 210 so as to be exposed to be coupled to the storage container 180 so that the top chassis 300 is fixed to the display unit 200.

The backlight assembly 100, the display unit 200, and the top chassis 300 are accommodated in the rear case 400, and the rear case 400 is provided at the top of the top chassis 300. The liquid crystal display device is completed by opposing each other with 500.

As described above, according to the present invention, the emission surface of the light emitting device package is formed to be bent in a sawtooth shape or a plurality of semicircular shapes. Therefore, the emission light emitted from the light emitting device package is dispersed to increase the emission angle.

In particular, in the edge type backlight assembly in which the light emitting device package is formed on the side of the light guide plate, since the light emitting device package does not generally include a lens for dispersing the emitted light, the emission surface may be formed as a curved surface to provide the emission angle. By increasing, the dark portion on the screen of the liquid crystal display device can be effectively prevented.

Although described above with reference to the embodiments, those skilled in the art can be variously modified and changed within the scope of the invention without departing from the spirit and scope of the invention described in the claims below. I can understand.

Claims (13)

A light emitting device for emitting light; And And a protective member surrounding the light emitting device, the protective member having a curved shape and having a light emitting surface for dispersing the emitted light. The light emitting device package of claim 1, wherein the light emitting device is a light emitting diode. The light emitting device package according to claim 1, wherein the curved shape is sawtooth shape. The light emitting device package of claim 3, wherein the sawtooth shape is formed in a vertical direction to disperse the light emitted by the light emitting device from side to side. The light emitting device package according to claim 1, wherein the curved shape has a plurality of semicircular shapes. The light emitting device package according to claim 1, wherein the protective member is an epoxy resin. A plurality of light emitting device packages including a light emitting device for emitting light and a protection member surrounding the light emitting device and having a curved shape and having an emission surface for dispersing the emitted light; And And a light guide plate guiding a path of light emitted from the light emitting device packages. The backlight assembly of claim 7, wherein the light emitting element is a light emitting diode. The backlight assembly of claim 7, wherein the curved shape is sawtooth shaped. The backlight assembly of claim 9, wherein the sawtooth shape is formed in a vertical direction to disperse the light emitted by the light emitting element from side to side. The backlight assembly of claim 7, wherein the curved shape is a plurality of semi-circular shapes. 8. The backlight assembly of claim 7, wherein the protection member is an epoxy resin. A light emitting device package including a light emitting device for emitting light and a protection member surrounding the light emitting device and having a curved shape and having an emission surface for dispersing the emitted light; A backlight assembly having a light guide plate for guiding a path; And And a liquid crystal panel including two substrates and a liquid crystal layer formed between the substrates, and displaying an image by using light emitted from the backlight assembly.

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