KR20060084026A - Back light assembly and display device having same - Google Patents

Abstract

A backlight assembly having an improved display quality of an image and a display device having the same are provided. The backlight assembly includes a light generating unit and a container. The light generating unit includes a light source unit for generating light, a driving substrate for supplying power to the light source unit, a lens disposed above the light source unit to diffuse light generated from the light source unit, and a connection unit extending from the lens to fix the lens to the driving substrate. . The storage container houses the light generating unit. As such, as the lens for diffusing the light is fixed to the driving substrate by the connecting portion, the lens can be prevented from being separated from the light source portion due to external impact, and as a result, the display quality of the image can be improved by supplying stable light. Can be.

Description

BACK LIGHT ASSEMBLY AND DISPLAY DEVICE HAVING THE SAME}

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

FIG. 2 is a perspective view illustrating the lens and the connecting portion of the backlight assembly of FIG. 1.

3 is a cross-sectional view of the backlight assembly of FIG. 1 taken along line II ′.

4 is a cross-sectional view of the backlight assembly of FIG. 1 taken along the line II-II '.

FIG. 5 is a perspective view illustrating an extract of a lens and a connecting portion in the backlight assembly according to the second exemplary embodiment of the present invention. FIG.

6 is a cross-sectional view of the light generating unit of the backlight assembly of FIG. 5;

7 is a perspective view illustrating a display device according to an exemplary embodiment of the present invention.

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

100, 500: light generating unit 110, 510: light source

120, 520: driving substrate 130, 530: lens

140: connection portion 200: storage container

300: reflector 400: light guide plate                 

600: display panel 700: optical sheet

800: fixing member 900: top chassis

The present invention relates to a backlight assembly and a display device having the same, and more particularly, to a backlight assembly and a display device having the same, by providing stable light to improve the display quality of an image.

In general, various electronic devices such as mobile communication terminals, digital cameras, notebook computers, and monitors include a display device for displaying an image. There are various types of display devices, such as cathode-ray tubes, liquid crystal displays, plasma display panels, field emission displays and electroluminescence. There is an electroluminescence device.

Among these, the liquid crystal display (LCD) displays an image by using the electrical and optical characteristics of the liquid crystal (Liquid Crystal). The liquid crystal display (LCD) is thinner and lighter than other display devices, has advantages of low power consumption and low driving voltage, and is widely used throughout the industry.

The liquid crystal display (LCD) includes a liquid crystal display panel for displaying an image using a light transmittance of liquid crystal and a backlight assembly for providing light to the display panel.                         

The backlight assembly employed in the liquid crystal display includes a light source for generating light, and the light source includes a cold cathode fluorescent lamp (CCFL), an external electrode fluorescent lamp (EEFL), and a flat plate. Fluorescent lamps (FFL) and the like are used. Recently, a light emitting diode (LED) having low power consumption and excellent color reproducibility and brightness has been used as the light source.

In general, since the light emitting diodes generate light having an optical distribution in the form of dots, a backlight assembly employing the light emitting diodes as a light source requires a technique of diffusing the light.

In order to solve this problem, the backlight assembly includes a lens for diffusing the light, and the lens is disposed on the light emitting diode and coupled to the light emitting diode by an adhesive material.

However, the lens is easily separated from the light emitting diode due to an external impact, and as a result, the light generated by the light emitting diode is not diffused, and thus the display quality of the image of the display device is degraded.

Therefore, the technical problem of the present invention is to solve such a conventional problem, and an object of the present invention is to provide a backlight assembly that improves the display quality of the image by preventing the detachment of the lens.

Another object of the present invention is to provide a display device including the backlight assembly.

In order to achieve the above object of the present invention, the backlight assembly includes a light generating unit and a storage container. The light generating unit includes a light source unit, a driving substrate, a lens, and a connection unit. The light source unit generates light. The driving substrate supplies power to the light source unit. The lens is disposed above the light source unit to diffuse the light. The connection part extends from the lens to fix the lens to the driving substrate. The storage container houses the light generating unit.

In accordance with another aspect of the present invention, a display device includes a backlight assembly and a display panel. The backlight assembly includes a light generating unit and a receiving container. The light generating unit includes a light source unit for generating light, a driving substrate for supplying power to the light source unit, a lens disposed above the light source unit to diffuse the light, and a connection unit extending from the lens to fix the lens to the driving substrate. It includes. The storage container houses the light generating unit. The display panel is disposed on the backlight assembly to display an image using light generated by the backlight assembly.

According to the backlight assembly and the display device having the same, as the lens for diffusing light is fixed to the driving substrate by the connecting portion, the lens can be prevented from being separated from the driving substrate due to external impact, and as a result, the backlight assembly is stable. The display quality of the image can be improved by supplying light.                     

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

<Example-1 of Backlight Assembly>

1 is an exploded perspective view showing a backlight assembly according to an embodiment of the present invention, Figure 2 is a perspective view showing an extract of the lens and the connecting portion of the backlight assembly of Figure 1, Figure 3 is a backlight assembly of Figure 1 4 is a cross-sectional view taken along line II ′, and FIG. 4 is a cross-sectional view taken along line II-II ′ of the backlight assembly of FIG. 1.

1 to 4, the backlight assembly includes a light generating unit 100, a storage container 200, a reflecting plate 300, and a light guide plate 400.

The light generating unit 100 is disposed in the storage container 200 to generate light. The light generating unit 100 includes a light source unit 110, a driving substrate 120, a lens 130, and a connection unit 140.

The plurality of light source parts 110 are disposed on the driving substrate 120, and receive power from the driving substrate 120 to generate light. The light source unit 110 includes a point light source 112, a light source body 114, and a lead wire 116.

The point light source 112 is a light emitting diode that generates light having a point-shaped optical distribution. The point light source 112 includes a red light emitting diode for generating red light, a green light emitting diode for generating green light, and a blue light emitting diode for generating blue light. The red light, green light and blue light are mixed with each other to form white light. As another example, the point light source 112 may include a white light emitting diode that generates white light.

The light source body 114 includes a receiving groove 114a formed at the center of the upper surface. The light source body 114 accommodates the point light source 112 by the receiving groove 114a. The storage groove 114a is filled with a transparent synthetic resin to prevent the flow of the point light source 112.

A heat transfer part 114b is formed in the light source body 114 to transfer the heat generated from the point light source 112 to the driving substrate 120. The heat transfer part 114b is disposed below the accommodating groove 114a in which the point light source 112 is disposed, and includes a metal material having excellent thermal conductivity. The metal material may be, for example, aluminum (Al). desirable.

The lead wire 116 electrically connects the driving substrate 120 and the point light source 112 to supply power from the driving substrate 120 to the point light source 112. The lead wire 116 is coupled to the light source body 114, and a pair is disposed at positions facing each other with the light source body 114 interposed therebetween. The lead wire 116 is made of a metal material having excellent electrical conductivity. For example, the lead wire 116 is made of copper (Cu).

The driving substrate 120 is accommodated in the receiving container 200 and supplies power to the light source unit 110. The driving substrate 120 has a plate shape extending in the X-axis direction, and a plurality of the driving substrates 120 are disposed in parallel in the Y-axis direction. Wires (not shown) for supplying power to the light source unit 110 are formed on the driving substrate 120.

The driving substrate 120 is in contact with the heat transfer part 114b formed in the light source body 114 and absorbs heat generated from the point light source 112 via the heat transfer part 114b. The absorbed heat is transferred to the storage container 120 through the driving substrate 120 and discharged to the outside. The driving substrate 120 is preferably made of a metal material having excellent thermal conductivity, for example, aluminum (Al).

The lens 130 is disposed above the light source unit 110 to diffuse the light generated by the light source unit 110. Although the lens 130 illustrated in the drawings is illustrated to have a hemispherical shape as an example, the lens 130 may have another shape in order to diffuse the light even more.

The lens 130 is coupled to the upper portion of the light source unit 110 by the transparent first adhesive material 10. In general, when the light generated from the point light source 110 is incident on the lens 130, the light has a high reflectance due to a sudden change in the refractive index. The first adhesive material 10 is inserted as a medium between the lens 130 and the light source unit 110 to prevent a sudden change in the refractive index, thereby reflecting the reflectance of the light generated from the point light source 110 Decrease. The first adhesive material 10 may be, for example, epoxy or silicon.

The connection part 140 extends or is disposed from the lens 130 and surrounds the outer shell of the light source part 110. The bottom surface of the connection portion 140 is in contact with the driving substrate 120, and is bonded to the driving substrate 120 by the second adhesive material 20. As such, as the connection part 140 is attached to the driving substrate 120, the lens 130 may be fixed to the driving substrate 120.

As the connection part 140 is disposed outside the light source part 110, a predetermined space is formed between the connection part 140 and the light source part 140. In the drawing, although the bottom surface of the connecting portion 140 is bonded to the driving substrate 120 by the second adhesive material 20, the connecting portion 140 is coupled to the driving substrate 120. Alternatively, the connecting portion 140 is filled with a part or all of the space formed between the connecting portion 140 and the light source unit 140, the second adhesive material 20 has a stronger adhesive force and the driving substrate ( 120).

In addition, a connection groove 142 is formed at a position corresponding to the lead wire 116 in the connection portion 140. The connection groove 142 provides a position where the lead wire 116 and the driving substrate 120 can be coupled to each other.

The storage container 200 includes a bottom surface 210 and a side wall 220 extending from an edge of the bottom surface 210, and the storage space is defined by the bottom surface 210 and the side wall 220. do. The light generating unit 100 is accommodated in the accommodation space. The side wall 220 of the storage container 200 is provided with a step 222 for supporting the edge of the light guide plate 400.

The reflection plate 300 is disposed on the bottom surface 210 of the storage container 200 to reflect the light toward the bottom surface 210 of the light generated by the light generating unit 100 upward. A plurality of holes 310 are formed in the reflective plate 300 at a position corresponding to the lens 130 of the light generating unit 100.

The light guide plate 400 is seated on the step 222 of the storage container 200 and is disposed above the light generating unit 200. The light guide plate 400 diffuses the light generated in the light generating unit 100 to increase the light mixing efficiency. In addition, a reflective pattern may be further disposed on the bottom surface of the light guide plate 400 to reflect the light generated by the light generating unit 100 to improve the luminance uniformity of the backlight assembly. The reflection pattern is formed at a position corresponding to the light generating unit 100 to prevent the light generated by the light generating unit from being directly emitted upward.

As described above, the lens 130 for diffusing light is not only adhered and fixed to the upper portion of the light source unit 110, but also driven by the connection unit 140 extending from an end of the lens 130. As the lens 130 is fixed to the substrate 120, the lens 130 may be prevented from escaping from the light source unit 130 due to an external impact or the position thereof is changed. As a result, the backlight assembly provides more stable light to the top. can do.

<Example-2 of Backlight Assembly>

FIG. 5 is a perspective view illustrating an extract of a lens and a connection part of the backlight assembly according to the second exemplary embodiment of the present invention, and FIG. 6 is a cross-sectional view of the light generating unit of the backlight assembly of FIG. 5; Except for the light generating unit, the backlight assembly according to the second embodiment of the present invention has the same configuration as the backlight assembly according to the first embodiment as described above, and thus a duplicated description thereof will be omitted. The same reference numerals and names are used.

5 to 6, the backlight assembly includes a light generating unit 500, a receiving container 200, a reflecting plate 300, and a light guide plate 400.                     

The light generating unit 500 is disposed in the storage container 200 to generate light. The light generating unit 500 includes a light source unit 510, a driving substrate 520, a lens 530, and a connection unit 540.

The light source unit 510 receives power from the driving substrate 520 to generate light. The light source unit 510 includes a point light source 512, a light source body 514, and a lead wire 516.

The point light source 512 is a light emitting diode that generates light having a point-shaped optical distribution.

The light source body 514 is provided with a receiving groove 514a for accommodating the point light source 512. The storage groove 514a is filled with a transparent synthetic resin to prevent the flow of the point light source 512. In addition, a heat transfer part 514b is formed in the light source body 514 to transfer the heat generated from the point light source 512 to the driving substrate 520.

The lead wire 516 is coupled to the light source body 514 to electrically connect the driving substrate 520 and the point light source 512.

The driving substrate 520 is accommodated in the storage container 200 to supply power to the light source unit 110. Wires (not shown) for supplying power to the light source unit 110 are formed on the driving substrate 120. In addition, the driving substrate 520 includes a coupling hole 522 that may be coupled to the protrusion 544 of the connection portion 540 to be described later.

The lens 530 is disposed above the light source 510 to diffuse the light generated by the light source 510. The lens 530 is coupled to the upper portion of the light source 510 by the transparent first adhesive material 10.

The connection part 540 extends or is disposed from the lens 530 and surrounds the outer shell of the light source part 510. In addition, the connection part 540 is formed with a connection groove 542 at a position corresponding to the lead wire 516.

The bottom surface of the connecting portion 540 is bonded to the driving substrate 520 by the second adhesive material 20, and thus the lens 530 is fixed to the driving substrate 520. In this case, a predetermined space is formed between the connection unit 140 and the light source unit 140, and the second adhesive material 20 is also filled in part or all of the space, thereby having a stronger adhesive force and the driving substrate ( 520 may be combined.

A protrusion 544 protruding to a predetermined length is formed on a bottom surface of the connection part 540. The protrusion 544 is coupled to the coupling hole 522 formed in the driving substrate 520 to fix the connection part 540 to the driving substrate 520. The protrusion 544 is preferably formed to have the same length as the thickness of the driving substrate 520.

The protrusion 544 has a cylindrical shape that becomes thinner as it moves away from the connecting portion 540. As the protrusion 544 has the cylindrical shape, the connection part 540 may be easily coupled to the driving substrate 520 through a single operation. In addition, since the protrusion 544 is generally made of a synthetic resin having a softness, and the driving substrate 520 is made of a metal material having a high hardness, the protrusion 544 is a part of the protrusion 544 is driven. By pressing the substrate 520, the driving substrate 520 may be more firmly coupled to the driving substrate 520.                     

In addition, the protrusion 544 guides the connection portion 540 to be coupled to a predetermined position of the driving substrate 520. As a result, the protrusion 544 can prevent the optical axis of the lens 530 and the optical axis of the point light source 512 from shifting each other.

As described above, as the protrusion 544 formed on the connection part 540 is coupled to the coupling hole 522 formed on the driving substrate 520, the lens 530 which diffuses the light is more strongly. The lens 530 may be fixed to the driving substrate 520, and thus the lens 530 may be prevented from being separated from the light source 530 or the position thereof is changed by an external impact.

In addition, the connection part 540 is coupled to a predetermined position of the driving substrate 520 by the protrusion 544 to prevent the optical axis of the lens 530 and the optical axis of the point light source 512 from shifting each other. Can be.

<Example of Display Device>

7 is a perspective view illustrating a display device according to an exemplary embodiment of the present invention. Since the backlight assembly of the display device according to the exemplary embodiment has the same configuration as the backlight assembly according to the first embodiment described above, duplicate description thereof will be omitted, and the same reference numerals and names are used for the same components. Let's use.

Referring to FIG. 7, a display device includes a backlight assembly for generating light, a display panel 600 for displaying an image using the light, an optical sheet 700 for improving optical characteristics of the light, and the display panel 600. ) And a mold frame 800 supporting the display panel and a top chassis 900 fixing the display panel 600.

The display panel 600 is disposed above the backlight assembly and changes the light generated by the backlight assembly into image light including information. The display panel 600 includes a first substrate 610, a second substrate 620, a liquid crystal layer 630, a printed circuit board 640, and a flexible printed circuit board 650.

The first substrate 610 includes a plurality of pixel electrodes arranged in a matrix, thin film transistors (TFTs) for applying a driving voltage to the pixel electrodes, and the thin film transistors. Signal lines for operating the respective TFTs.

The pixel electrode includes a transparent and conductive indium tin oxide film (ITO), an indium zinc oxide film (IZO), and an amorphous indium tin oxide film (a-ITO). And the like are patterned and formed by a photo-etch process.

The second substrate 620 is disposed to face the first substrate 610. The second substrate 620 includes a common electrode which is disposed on the front surface of the second substrate 620 and is transparent and conductive, and color filters disposed to face the pixel electrodes. .

The color filters include a red color filter selectively passing red light of white light, a green color filter selectively passing green light of white light, and blue color filters selectively passing blue light of white light.                     

The liquid crystal layer 630 is interposed between the first substrate 610 and the second substrate 620 and rearranged by an electric field formed between the pixel electrode and the common electrode. The rearranged liquid crystal layer 630 adjusts the light transmittance of the light generated from the backlight assembly, and the light whose light transmittance is adjusted passes through the color filters to display an image.

The printed circuit board 640 includes a driving circuit unit for processing an image signal, and the driving circuit unit converts an image signal input from the outside into a driving signal for controlling the thin film transistor TFT.

The flexible printed circuit board 650 electrically connects the printed circuit board 640 and the first substrate 610 to receive the driving signal generated from the printed circuit board 640 by the first substrate 610. )

The optical sheet 700 is disposed between the backlight assembly and the display panel 600. The optical sheet 700 improves optical characteristics of light generated by the backlight assembly.

The optical sheet 700 includes, for example, a diffusion sheet 710 for diffusing light to improve uniformity of brightness and mixing efficiency of light and at least one prism sheet for improving front brightness of light through reflection and refraction. 720. For example, the prism sheet 720 includes a first prism sheet having a first prism pattern formed in the X-axis direction and a second prism sheet having a second prism pattern formed in the Y-axis direction.

The mold frame 800 is disposed between the backlight assembly and the optical sheets 700 and supports edges of the display panel 600 and the optical sheets 700.

The top chassis 900 surrounds the edge of the display panel 600 and is coupled to the side wall 220 of the storage container 200 to fix the display panel 600 to the upper portion of the backlight assembly.

The top chassis 900 prevents the display panel 600 from being damaged or damaged by brittleness due to external shocks and vibrations, and the display panel 600 is separated from the storage container 200. Prevent it.

As described above, according to the present invention, as the lens for diffusing light is not only adhered and fixed to the upper portion of the light source portion, but also is fixed to the driving substrate by a connecting portion extending from the lens, the lens is removed from the light source portion by external impact. It is possible to prevent the deviation or position change, and as a result, the backlight assembly can provide a more stable light to the display panel to improve the display quality of the image.

In addition, as the projection formed in the connection portion is coupled to the coupling hole formed in the driving substrate, the lens can be fixed to the driving substrate more strongly, and the optical axis of the lens and the optical axis of the point light source can be adjusted so as not to shift each other. As a result, the backlight assembly may provide more stable light to the display panel, thereby improving display quality of the image.

Although described above with reference to the embodiments, those skilled in the art can variously modify and change the present invention without departing from the spirit and scope of the invention described in the claims below. You will understand.

Claims (10)

A light source unit generating light, a driving substrate supplying power to the light source unit, a lens disposed above the light source unit to diffuse the light, and a connection part extending from the lens to fix the lens to the driving substrate Light generating unit; And And a storage container accommodating the light generating unit. The backlight assembly of claim 1, wherein the connection part is attached to the driving substrate by an adhesive material. The backlight assembly of claim 1, wherein a protrusion is formed on the connection part and protrudes to a predetermined length, and a coupling hole is formed on the driving substrate. The backlight assembly of claim 3, wherein the protrusion has a cylindrical shape, and the cylindrical shape becomes thinner as the distance from the connection part increases. The light source unit of claim 1, wherein the light source unit comprises a point light source for generating the light, a light source body having a receiving groove for accommodating the point light source, and a lead wire coupled to the light source body to electrically connect the driving substrate to the point light source. Backlight assembly comprising a. The backlight assembly of claim 5, wherein a connection groove is formed at a position corresponding to the lead wire. The backlight assembly of claim 5, wherein the light source body has a heat transfer part configured to transfer heat generated from the point light source to the driving substrate. The backlight assembly of claim 7, wherein the heat transfer part comprises a metal material having excellent thermal conductivity. The backlight assembly of claim 5, wherein the point light source comprises at least one selected from the group consisting of a red light emitting diode, a green light emitting diode, a blue light emitting diode, and a white light emitting diode. A light generating unit having a light source unit generating light, a driving substrate supplying power to the light source unit, a lens disposed above the light source unit to diffuse the light, and a connection part extending from the lens to fix the lens to the drive substrate and. A backlight assembly including a receiving container accommodating the light generating unit; And And a display panel disposed on the backlight assembly to display an image by using light generated by the backlight assembly.

Images