KR101229284B1 - Back-light assembly and display device having the same - Google Patents

Abstract

A backlight assembly having a reduced size of a bezel and a display device having the same are disclosed. The backlight assembly includes a container, a lamp, and an optical guide member. The containment vessel includes a bottom portion and a side portion extending from an edge of the bottom portion to form a receiving space. The light generating unit is disposed in the receiving space to generate light. The light guide member is disposed above the light generating unit, has a shape protruding toward the bottom to receive light in a horizontal direction with the bottom, and guides the incident light to the top of the storage container. As described above, as the lamp is disposed under the light guide member, the size of the bezel of the display device may be further reduced.

Optical guide member, first optical guide portion, second optical guide portion

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

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

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

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

100: storage container 110: bottom

112: receiving groove 120: side

122: first inclined portion 200: light generating unit

210: lamp 220: lamp cover

300: optical guide member 310: first optical guide portion

320: second light guide portion 400: reflector plate

500: optical sheet 600: mold frame

700: backlight assembly 800: display panel

900: top chassis 1000: display device

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 to reduce the size of the bezel.

Recently, an information processing device has various forms and various functions, and processes information at a higher speed. The information processed in the information processing apparatus has an electrical signal format. Therefore, in order for the user to visually check the information processed by the information processing apparatus, display apparatuses displaying the information as an image are required.

One of the display devices, a liquid crystal display, displays an image using liquid crystals. The liquid crystal display device has advantages of thinner, lighter weight, lower power consumption, and lower driving voltage than other display devices.

The liquid crystal display generally includes a liquid crystal display panel displaying an image using light transmittance of a liquid crystal, and a backlight assembly disposed under the liquid crystal display panel to provide light to the liquid crystal display panel. back-light assembly). In this case, the backlight assembly includes a direct type backlight assembly and an edge type backlight assembly.

The direct type backlight assembly includes a plurality of lamps disposed in parallel below the liquid crystal display panel, and directly applies light generated from the lamps to the liquid crystal display panel.

The edge type backlight assembly may include a lamp for generating light, a light guide plate disposed to face side of the lamp to guide the light generated from the lamp, and a light disposed below the light guide plate and directed toward a lower side of the light in the light guide plate. It includes a reflector.

However, in the edge type backlight assembly, the size of the bezel of the liquid crystal display increases as the lamp is disposed on the side of the light guide plate. In this case, the bezel refers to an edge area next to a screen of the liquid crystal display.

In addition, the edge type backlight assembly is preferably provided with a plurality of lamps to improve the brightness of the light, but if the plurality of lamps in this way, there is a problem that the size of the bezel further increases.

Accordingly, 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 which reduces the size of the bezel by changing the arrangement position of the lamp.

Another object of the present invention is to provide a display device having the above-described backlight assembly.

The backlight assembly according to an embodiment for achieving the above object of the present invention includes a housing, a lamp and an optical guide member. The container includes a bottom portion and a side portion extending from an edge of the bottom portion to form a receiving space. The light generating unit is disposed in the receiving space to generate light. The light guide member is disposed above the light generating unit and has a shape protruding toward the bottom to receive the light in a horizontal direction with the bottom, and the incident light to the top of the storage container. Guide.

According to another aspect of the present invention, a display device includes a backlight assembly and a display panel. The backlight assembly may include a storage container including a bottom portion and a side portion to define a storage space, a light generating unit disposed in the storage space to generate light, and disposed above the light generating unit, and the light may be disposed on the floor. And a light guide member protruding toward the bottom portion so as to be incident in a direction horizontal to the portion, and guiding the incident light to an upper portion of the storage container. The display panel is disposed on the backlight assembly and displays an image using light guided by the light guide member.

According to the backlight assembly and the display device having the same, as the lamp is disposed under the light guide member, the size of the bezel of the display device can be further reduced.

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 illustrating a backlight assembly according to an exemplary embodiment of the present invention, and FIG. 2 is a cross-sectional view of the backlight assembly of FIG. 1 taken along line II ′.

1 and 2, the backlight assembly 700 according to the present embodiment generates light, and includes a storage container 100, a light generating unit 200, a light guide member 300, a reflecting plate 400, The optical sheet 500 and the mold frame 600 are included.

The storage container 100 includes a bottom portion 110 and side portions 120 extending from an edge of the bottom portion, and defines a storage space by the bottom portion 110 and the side portions 120. The light generating unit 200, the light guide member 300, the reflector plate 400, the optical sheets 500, and the mold frame 600 are disposed in the storage space of the storage container 100.

The bottom portion 110 of the storage container 100 is formed with a receiving groove 112 for accommodating the light generating unit 200. A pair of receiving grooves 112 are formed at both edges of the bottom portion 110 in the Y-axis direction. The receiving groove 112 is formed long in the X-axis direction in the longitudinal direction.

A portion of the side portions 120 of the storage container 100 is formed with a first inclined portion 122 for supporting a portion of the light guide member 300. The first inclined portion 122 is formed below the inner surface of both side portions 120 of the side portions 120 that face in the Y-axis direction. The longitudinal section of the first inclined portion 122 has a right triangular shape and is elongated with the X-axis direction as the longitudinal direction.

The light generating unit 200 is received in the receiving groove 112 of the storage container 100 to generate light, and includes a lamp 210 and a lamp cover 220.

The lamp 210 is accommodated in the receiving groove 112 and generates light by receiving power from the outside. The lamp 210 has a long rod shape in the X-axis direction, and a plurality of lamps 210 are arranged in parallel in the direction parallel to the bottom surface 110, that is, in the Y-axis direction. In one example, the lamps 210 are divided into two groups, and the lamps 210 of each group are disposed parallel to the pair of receiving grooves 112 in the Y-axis direction. The lamps 210 shown in the drawing are divided into two groups of four and received in each receiving groove 210.

The lamp cover 220 is accommodated in the pair of accommodating grooves 112, respectively, and covers a part of the lamps 210 divided into two groups. The longitudinal section of the lamp cover 220 preferably has a U-shape, and is formed long along the X-axis direction.

The lamp cover 220 surrounds a portion of the lamps 210 to be opened toward both sides 120 in the Y-axis direction. The lamp cover 220 reflects the light generated from the lamps 210 and focuses the light toward both sides 120 in the Y-axis direction.

The light guide member 300 is disposed above the lamp cover 220 to guide the light generated by the lamps 210. The light guide member 300 includes a first light guide part 310 and a second light guide part 320. The light guide member 300 may be made of a synthetic resin capable of guiding light through total reflection, and may be made of, for example, polymethyl methcrylate (PMMA).

The first light guide part 310 is disposed in the pair of accommodating grooves 112 together with the lamp cover 220 and the lamps 210, respectively, and parallel to the lamp cover 220 and the lamps 210. Is placed. The first light guide part 310 is formed long in the X-axis direction and is disposed close to both sides 120 in the Y-axis direction.

The first light guide part 310 receives light generated from the lamps 210 and guides the light to the second light guide part 320. The first light guide part 310 is formed with a first reflection surface 312 that reflects light incident therein and guides the light to the second light guide part 320. The first reflective surface 312 is formed at a position corresponding to the first inclined portion 122 of the side wall 120 of the storage container 100. Therefore, as the first reflective surface 312 is formed to correspond to the first inclined portion 122, the first inclined portion 122 may more firmly support the first light guide portion 312.

A first reflective layer (not shown) may be further formed on the first reflective surface 312 to improve reflection efficiency of light incident therein. The first reflective layer is a metal layer, and is formed by, for example, aluminum (Al) plating or silver (Ag) plating. Alternatively, the first reflective layer may be formed on the first inclined portion 122 rather than on the first reflective surface 312.

The second light guide part 320 is disposed above the lamp cover 220 and the first light guide part 310, and guides the light guided by the first light guide part 310 to accommodate the storage container 100. Exit to the top of the.

The second light guide part 320 has a plate shape and has a predetermined thickness. An edge of the second light guide part 320 is seated on an upper portion of the pair of lamp covers 220 and the first light guide part 310 disposed close to both side parts 120. The central portion of the second light guide portion 320 is supported by the bottom portion 110 of the storage container 100.

The second light guide part 320 is formed with a second reflecting surface 322 for reflecting the light guided from the first light guide part 310. The second reflecting surface 322 is formed at a position corresponding to the first reflecting surface 312, and is formed at edges of both ends of the second light guide part 320. That is, the second reflecting surface 322 may be formed by cutting the edges of both ends of the second light guide part 320 to be inclined.

A second reflective layer (not shown) may be further formed on the second reflective surface 322 to improve reflection efficiency of light incident therein. The second reflective layer is a metal layer, and is formed by, for example, aluminum (Al) plating or silver (Ag) plating. Alternatively, the second reflective layer may be formed on the second inclined portion 630 of the mold frame 600 to be described later, not on the second reflective surface 322.

A plurality of reflection patterns (not shown) may be further formed below the second light guide part 320 to diffuse the light that is totally reflected into the second light guide part 320 to change the path of the light. The second light guide part 320 may emit light to the upper portion of the storage container 100 by the reflection patterns.

Although the first and second light guide parts 310 and 320 illustrated in the drawing are illustrated as being separated from each other, the first and second light guide parts 310 and 320 may be integrally formed with each other.

The reflector plate 400 is disposed under the second light guide part 320 to reflect the light traveling to the bottom of the second light guide part 320. Accordingly, the light reflected by the reflector 400 is re-incident into the second light guide part 320. In this case, both edges of the reflective plate 400 are disposed between the lamp cover 220 and the second light guide part 320, and the central portion of the reflective plate 400 is located on the bottom 110 of the storage container 100. It is preferably arranged in.

The optical sheet 500 is disposed above the second light guide part 320, and diffuses, reflects, and refracts the light emitted to the upper part of the second light guide part 320 so that the front luminance and brightness uniformity of the light are increased. Improve more. The optical sheet 500 includes, for example, a diffusion sheet 510 for diffusing light to improve luminance uniformity and at least one prism sheet 520 for reflecting and refracting light to improve front luminance.

The mold frame 600 is disposed above the storage container 100 and presses an edge of an upper portion of the second light guide part 320 to fix the second light guide part 320. The mold frame 600 is open at the center thereof to allow light to pass therethrough. In the mold frame 600, a first step 610, a second step 620, and a second inclined part 630 are formed.

The first step 610 is formed at an upper end of the mold frame 600 and supports an edge of a display panel (not shown) for displaying an image. The second step 620 is formed at the lower end of the mold frame opposite to the first step, and fixes the optical sheets. The second inclined portion 630 is formed at a position facing the second reflective surface 322 of the second light guide portion 320, and is coupled to the second reflective surface 322 to form the second light guide portion 320. More fixed. The longitudinal section of the second inclined portion 630 has a right triangle shape.

According to the present embodiment, as the lamp 210 is disposed below the second light guide part 320, the size of the bezel may be further reduced, and the lamp 210 may be parallel with the bottom part 110. By being arranged in plural, the luminance of the display device may be further improved.

In the backlight assembly 700 according to the present exemplary embodiment, a pair of light generating units 200 are disposed in a pair of accommodating grooves 112, as shown in the drawing. Alternatively, the accommodating groove 112 has one end. Is formed only in one light generating unit 200 may be disposed in the receiving groove (112). In this case, when the light generating unit 200 is configured as one, the second light guide unit 320 preferably has a wedge shape in which the thickness decreases as the distance from the light generating unit 200 increases.

In addition, in the backlight assembly 700 according to the present exemplary embodiment, the first and second reflective layers are formed on the first and second reflective surfaces 312 and 322 to reflect light. Reflective sheets may be further disposed on the first and second reflective surfaces 312 and 322. In this case, it is preferable that the reflective sheet surrounds the first and second reflective surfaces 312 and 322 and the region facing the side wall 120 among the outer sides of the first and second light guide portions 310 and 320 at once. .

<Example of Display Device>

3 is an exploded perspective view illustrating a display device according to an exemplary embodiment of the present invention, and FIG. 4 is a cross-sectional view taken along the line II-II ′ of the backlight assembly of FIG. 3. Since the backlight assembly of the display device according to the present exemplary embodiment has the same configuration as the backlight assembly of FIGS. 1 and 2 described above, duplicate description thereof will be omitted, and the same reference numerals and names are used for the same components. Shall be.

3 and 4, the display device 1000 according to the present exemplary embodiment includes a backlight assembly 700 that generates light, a display panel 800 disposed above the backlight assembly 700, and a display panel 800. It includes a top chassis 900 for fixing).

In the display panel 800, an edge of the display panel 800 is seated on the first step 610 of the mold frame 600, and is disposed on the optical sheet 500. The display panel 800 displays an image by using light emitted through the optical sheet 500. The display panel 800 may include a first substrate 810, a second substrate 820, a liquid crystal layer 830, a printed circuit board 840, and a flexible printed circuit board 850.

The first substrate 810 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. Signal lines for operating the transistors TFT are included.

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 820 is disposed to face the first substrate 810. The second substrate 820 includes a common electrode which is disposed on the front surface of the second substrate 820 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 830 is interposed between the first substrate 810 and the second substrate 820 and rearranged by an electric field formed between the pixel electrode and the common electrode. The rearranged liquid crystal layer 830 adjusts the light transmittance of the light passing through the optical sheets 500, and the light having the light transmittance adjusted passes through the color filters to display an image.

The printed circuit board 840 may include a data printed circuit board and a gate printed circuit board. The data printed circuit board is bent by the flexible circuit board 850 and disposed on the side or the back of the storage container 100, and the gate printed circuit board is bent on the flexible circuit board 850 and the side of the storage container 100. Or on the back side. Meanwhile, the gate printed circuit board may be removed by forming separate signal wires on the first substrate 810 and the flexible circuit board 850.

The flexible circuit board 850 electrically connects the printed circuit board 840 and the first substrate 810 to provide the driving signal generated from the printed circuit board 840 to the first substrate 810. The flexible circuit board 850 is, for example, a tape carrier package (TCP) or a chip on film (COF).

The top chassis 900 surrounds the edge of the display panel 800 and presses the mold frame 600. The top chassis 900 is coupled to the sidewalls 120 of the storage container 100 to fix the display panel 800 to the upper portion of the backlight assembly 700.

The top chassis 900 prevents the display panel 800 from being damaged or damaged by the brittleness due to external shocks and vibrations, and prevents the display panel 800 from being separated from the storage container 100. .

As described above, according to the present invention, as the lamp of the light generating unit is disposed below the edge of the second light guide unit, the size of the bezel corresponding to the edge of the screen in the display device may be further reduced.

In addition, as a plurality of lamps of the light generating unit are arranged in parallel with the bottom of the storage container, the brightness of the display device may be further improved.

In addition, as the lamp of the light generating unit is disposed below the second light guide portion, it is possible to prevent the heat generated from the lamp to proceed to the liquid crystal layer and the optical sheets.

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

Claims (13)

A storage container including a bottom portion, a side portion extending from an edge of the bottom portion to form an accommodation space, and a first inclined portion disposed on the edge portion connected to the bottom portion and the side portion and inclined with respect to the bottom portion; A light generation unit disposed in the accommodation space and disposed to face the first inclined portion and generating light; The light emitting unit is disposed above the light generating unit, and has a shape protruding toward the bottom to receive the light in a horizontal direction with the bottom part, and contacts the first inclined part to receive the incident light into the storage container. An optical guide member guiding to an upper portion of the light guide member; And A mold frame including a second inclined portion which presses an edge of the light guide member to fix the light guide member to the storage container, and is inclined in a direction crossing the inclined direction of the first inclined portion to contact the light guide member; Including, The light generated by the light generating unit is sequentially reflected by the first reflective surface of the light guide member in contact with the first inclined portion and the second reflective surface of the light guide member in contact with the second inclined portion. Backlight assembly, characterized in that the. The backlight assembly of claim 1, wherein the light generating unit comprises a plurality of lamps arranged in a direction parallel to a bottom portion of the storage container to generate the light. The method of claim 1, wherein the optical guide member A first light guide disposed to face the light generating unit in parallel and in contact with the first inclined portion, and receiving and guiding light generated from the light generating unit in a direction parallel to the bottom of the storage container; part; And A second light guide disposed above the light generating unit and the first light guide part and in contact with the second inclined part to guide the light guided by the first light guide part to the upper part of the storage container; Backlight assembly comprising a portion. The backlight assembly of claim 3, wherein the first light guide part comprises the first reflective surface. The backlight assembly of claim 4, wherein a first reflective layer is formed on the first reflective surface to reflect the incident light. The backlight assembly of claim 3, wherein the second light guide portion comprises the second reflective surface. The backlight assembly of claim 6, wherein a second reflective layer is formed on the second reflective surface to reflect the guided light. 4. The reflector of claim 3, further comprising a reflection sheet reflecting light incident to the first light guide portion and light guided by the first light guide portion. Characterized by a backlight assembly. The backlight assembly of claim 3, wherein the first light guide part is disposed at a position proximate to a side of the storage container. The backlight assembly of claim 3, wherein the first optical guide part is disposed in a position adjacent to both sides of the storage container. The backlight assembly of claim 2, wherein an accommodating groove is formed at a bottom of the accommodating container to accommodate the lamps. The method of claim 1, wherein the light generating unit A lamp for generating the light; And a lamp cover surrounding a portion of the outer shell of the lamp to focus the light in a horizontal direction on the bottom portion. A display panel displaying an image; A bottom portion facing the display panel, a side portion extending from an edge of the bottom portion to form a storage space, and a first inclined portion disposed at the edge portion connected to the bottom portion and the side portion and inclined with respect to the bottom portion; Storage container; A light generating unit disposed below the display panel in the storage space and facing the first inclined portion and generating light; The light emitting unit is disposed between the light generating unit and the display panel, and has a shape protruding toward the bottom to receive the light in a horizontal direction with the bottom, and contacts the first inclined part to receive the incident light. An optical guide member guiding the upper portion of the storage container; And Pressing an edge of the light guide member to fix the display panel and the light guide member to the storage container, the second inclined portion inclined in a direction crossing the inclination direction of the first inclined portion to contact the light guide member Including a mold frame containing, The light generated by the light generating unit is sequentially reflected by the first reflective surface of the light guide member in contact with the first inclined portion and the second reflective surface of the light guide member in contact with the second inclined portion. Display device characterized in that.

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