KR20110077272A - Backlight unit and liquid crystal display device having the same - Google Patents

Abstract

PURPOSE: A backlight unit of a liquid crystal display device is provided to reduce the weight of the liquid crystal display device by changing the structure of a bottom cover. CONSTITUTION: A backlight unit of a liquid crystal display device comprises a light source array which generates light, a light guide plate which includes a light incident part, an optical sheet which improves optical property of the light from the light guide plate, a bottom cover which receives the light guide plate and the optical sheet, and reinforcing bar which reinforces the strength of the bottom cover.

Description

Backlight unit and liquid crystal display device having the same {Backlight Unit and Liquid Crystal Display device having the same}

The present invention relates to a backlight unit, and more particularly, to a backlight unit having a reduced weight by modifying a structure of a bottom cover, and a liquid crystal display device having the same.

Recently, a flat panel display device such as a liquid crystal display device (PDP), a plasma display panel (PDP), and an organic light emitting diode (OLED) has been developed in place of the conventional CRT.

The liquid crystal display device includes a liquid crystal display panel including a thin film transistor array substrate, a color filter substrate, and a liquid crystal layer formed between the two substrates. Since the liquid crystal display panel is a non-light emitting device, a backlight unit for supplying light is disposed on the rear surface of the thin film transistor array substrate. The amount of light irradiated from the backlight unit is adjusted according to the arrangement of liquid crystals, and a light emitting diode (LED) having excellent color reproducibility and brightness is used as a light source of the backlight unit.

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

The edge type backlight unit installs a light source at one edge of the liquid crystal display panel, and irradiates light incident from the light source to the liquid crystal display panel through the light guide plate and the plurality of optical sheets. In the direct type backlight unit, a plurality of light sources are disposed on the rear surface of the liquid crystal display panel, and the light incident from the light source is irradiated onto the liquid crystal display panel through the diffusion plate and the plurality of optical sheets.

In the direct type backlight unit, a plurality of light sources are disposed on a plane. Since the shape of the light source is shown on the liquid crystal display panel, the distance between the light source and the liquid crystal display panel must be maintained, and the light scattering means is used for the uniform distribution of light quantity. There is a limit to thinning because it must be arranged. In the edge type backlight unit, a light source is installed at one edge of the liquid crystal display panel and the light is distributed to the entire surface by using the light guide plate. Since the light must pass through the light guide plate, there is a problem of low luminance. In addition, high optical design and processing techniques for the light guide plate are required for uniform distribution of light.

Since the direct type and edge type have their disadvantages, the direct type backlight unit is mainly used in the liquid crystal display device where brightness is more important than the screen thickness. In an important liquid crystal display device, an edge type backlight unit is mainly used.

Meanwhile, the direct type and edge type backlight units are accommodated in the bottom cover together with the liquid crystal display panel. The bottom cover is made of a metal material to release heat generated from the light source to the outside and is formed to include a plurality of structures for fixing the backlight unit. In addition, the bottom cover includes a metal reinforcing bar for maintaining strength. The weight of the bottom cover is increased due to the reinforcement bar and the structure, resulting in an increase in the overall weight of the liquid crystal display.

An object of the present invention is to provide a backlight unit and a liquid crystal display device having the same, by reducing the weight of the bottom cover to reduce the weight to minimize the inconvenience that users can feel when using the product.

The backlight unit according to an exemplary embodiment of the present invention includes a light guide plate including a light source array for generating light, a light incident part spaced apart from the light source array at a predetermined interval, and the light generated from the light source array is incident thereto, Reinforcing the strength of the bottom cover is located on the bottom of the bottom cover and the optical sheet for improving the optical characteristics of the light emitted from the light guide plate, the light source array, the light guide plate and the optical sheet and the bottom cover and the bottom cover And a reinforcing bar, wherein the bottom cover includes a bottom having first to fourth opening regions with a predetermined opening and first to fourth side portions extending from four surfaces of the bottom.

An LCD according to an exemplary embodiment of the present invention includes a light guide plate including a light source array generating light, a light incident part spaced apart from the light source array at a predetermined interval, and a light incident from the light source array incident thereto, and positioned above the light guide plate. And optical sheets for improving optical characteristics of the light emitted from the light guide plate, a liquid crystal display panel for displaying an image using light generated from the light source array, the light source array, a light guide plate, optical sheets, and a liquid crystal display panel. A bottom cover configured to receive and fix the bottom cover and a reinforcement bar positioned on a rear surface of the bottom cover to reinforce the strength of the bottom cover, wherein the bottom cover has a bottom portion having first to fourth opening regions in which a predetermined portion is opened; And first to fourth side portions extending from four surfaces of the bottom portion.

The backlight unit and the liquid crystal display device having the same according to the present invention change the structure having a plurality of openings on the bottom of the bottom cover, and reinforce the strength of the bottom cover by using a reinforcing bar rather than a metal material. Can reduce weight.

In addition, the backlight unit and the liquid crystal display device having the same according to the present invention can reduce the weight to minimize the inconvenience that the user may feel when using the product.

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

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

As shown in FIG. 1, the liquid crystal display according to the present invention includes a liquid crystal display panel 100 for displaying an image, a backlight unit 130 for providing light to the liquid crystal display panel 100 for displaying the image, and And a top case 190 for fixing the liquid crystal display panel 100 to the backlight unit 130.

The liquid crystal display panel 100 is mounted on the backlight unit 130 and displays an image using light supplied from the backlight unit 130. The liquid crystal display panel 100 is electrically connected to the gate driver 110 and the data driver 130 attached to one side and the other side.

The liquid crystal display panel 100 may include a liquid crystal layer formed between the first substrate 101, the second substrate 103 coupled to the first substrate 101, and the two substrates 101 and 103. Is not made).

The first substrate 101 includes a plurality of pixels in a matrix form, and each of the plurality of pixels includes a gate line GL extending in a first direction and a gate line extending in a second direction perpendicular to the first direction. And a data line DL and a pixel electrode intersecting and insulating GL. In addition, a thin film transistor TFT is formed in each pixel and connected to the gate line GL, the data line DL, and the pixel electrode.

An RGB pixel as a color filter is formed on the second substrate 103 by a thin film process, and a common electrode facing the pixel electrode is formed. Therefore, the liquid crystal layer is arranged by voltages applied to the pixel electrode and the common electrode, thereby adjusting the transmittance of light provided from the backlight unit 130.

The gate driver 110 may be attached to one of the short sides of the first substrate 101, and the data driver 120 may have one long axis that is orthogonal to the gate driver 110. It is attached to the face.

In this case, the gate driver 110 may be configured with a plurality of gate driver ICs integrated into one chip, and the data driver 120 may be configured with a plurality of data driver ICs integrated into one chip.

The backlight unit 130 may include a light source 170b for generating light, a light guide plate 150 for guiding light incident from the light source 170b, and exiting in a specific direction, and the light source 170b and the light guide plate 150. It includes a storage container 160 for receiving.

Here, the light source 170b includes a plurality of light emitting diodes (LEDs) in the form of point light sources, and is disposed at one side of the light guide plate 150 to generate light. In this case, the plurality of light emitting diodes (LEDs) are arranged to have a predetermined distance on the printed circuit board 170a disposed at the edge of the light guide plate 150. The light source 170b and the printed circuit board 170a form a light source array 170.

The light source array 170 including the printed circuit board 170a and the light source 170b may be located at both edges of the light guide plate 150, and may be located at either one edge.

The storage container 160 includes a bottom cover 160b and a mold frame 160a. The bottom cover 160b includes a bottom surface and four sidewalls extending from the bottom surface. Four sidewalls of the bottom cover 160b serve to guide the storage positions of the mold frame 160a and the light guide plate 150.

In this case, the bottom cover 160b and the mold frame 160a may be coupled to each other by hook fastening or the like.

The backlight unit 130 further includes a reflective sheet 180 provided between the bottom surface of the bottom cover 160b and the bottom surface of the light guide plate 150. In addition, the backlight unit 130 further includes a plurality of optical sheets 140 disposed on the emission surface of the light guide plate 150.

The plurality of optical sheets 140 may improve optical characteristics of light emitted through the exit surface of the light guide plate 150. The plurality of optical sheets 140 include a diffusion sheet 140c, a prism sheet 140b, and a protective sheet 140a.

The diffusion sheet 140c is disposed on the light guide plate 150 and diffuses the light emitted through the exit surface of the light guide plate 150. The prism sheet 140b is disposed on the diffusion sheet 140c and condenses the light diffused by the diffusion sheet 140c to improve front luminance. The protective sheet 140a may be disposed on the prism sheet 140b to prevent stain defects that are displayed in white by the prism sheet 140b.

FIG. 2 is a view illustrating the bottom cover of FIG. 1 in detail.

As shown in FIGS. 1 and 2, the bottom cover 160b includes a bottom portion 161 and first to fourth side portions 162 to 165 extending from four surfaces of the bottom portion 161, respectively. First and second reinforcing bars 200a and 200b are formed on the bottom surface of the bottom cover 160b to reinforce the bottom cover 160b.

The bottom portion 161 of the bottom cover 160b includes first to fourth opening regions OP1 to OP4 with portions partially exposed. The first and second opening regions OP1 and OP2 of the first to fourth opening regions OP1 to OP4 have the same shape and have different sizes. The third and fourth opening regions OP3 and OP4 have the same shape and the same size. In this case, the first opening area OP1 is smaller than the second opening area OP2.

The first and second opening regions OP1 and OP2 have a trapezoidal shape, and the third and fourth opening regions OP3 and OP4 have a triangular shape.

The shape and size of the first to fourth opening regions OP1 to OP4 formed in the bottom portion 161 of the bottom cover 160b are designed to simulate the structural change and the strength of the bottom cover 160b.

3 is a plan view illustrating the bottom cover of FIG. 2.

As illustrated in FIGS. 2 and 3, the bottom portion 161 of the bottom cover 160b includes first to fourth opening regions OP1 to OP4.

The lower side H9 of the trapezoidal first opening region OP1 is 660 mm, the height V8 is 160 mm, the upper side H11 is about 300 mm, and the curved surfaces R23 at both ends of the upper side H11 are 100mm.

Similarly, the lower side H1 of the trapezoidal second opening region OP2 is 740 mm, the height V5 is 180 mm, the upper side H3 is about 340 mm, and the curved surfaces of both ends of the upper side H3 are formed. It is the same as 1 opening area OP1.

The upper side H11 of the first opening area OP1 is 80 mm (V7) away from the origin and the upper side H3 of the second opening area OP2 is centered on the origin located at the center of the bottom part 161. Is 60 mm (V6) from the origin.

The lower side V20 of the triangular third opening region OP3 is 360 mm, and the height H21 is 260 mm. Similarly, the lower side V15 of the triangular fourth opening area OP4 is 360 mm, and the height H22 is 260 mm, which is the same as the third opening area OP3.

The first and the reinforcement bars 200a and 200b may be made of various materials, and the types thereof are as follows.

First, the first and second reinforcement bars 200a and 200b may be made of wood plywood or wood. When the first and second reinforcing bars 200a and 220b are formed of wood plywood or wood, the density is lower than that of the conventional reinforcing bars made of aluminum (Al). Therefore, when the first and second reinforcing bars 200a and 200b are made of wood plywood or wood, the weight of the product is reduced compared to the reinforcing bars made of aluminum (Al).

Secondly, the first and second reinforcement bars 200a and 220b may be made of plastic. When the first and second reinforcing bars 220a and 220b are formed of plastic, the density of the first and second reinforcing bars 220a and 220b is lower than that of the conventional reinforcing bars made of aluminum (Al). Therefore, when the first and second reinforcement bars 200a and 200b are made of plastic, the weight of the product is reduced compared to the reinforcement bars made of aluminum (Al).

Third, the first and second reinforcement bars 200a and 200b may have a wire mesh structure. When the first and second reinforcement bars 200a and 200b are formed in a wire mesh structure, the weight of the first and second reinforcement bars 200a and 200b may be a conventional reinforcement bar made of a metal plate of aluminum (Al). lower than ar).

Fourth, the first and second reinforcing bars (200a, 200b) may be made of magnesium (Mg), the magnesium (Mg) has a lower density than aluminum (Al) and the same strength as aluminum (Al) Has Therefore, when the first and second reinforcing bars (200a, 200b) are formed of magnesium (Mg), the effect of reducing the weight of the product is greater than the conventional reinforcement bar (Bar) made of aluminum (Al). .

As described above, the first to fourth opening regions OP1 to OP4 designed through simulation are formed in the bottom portion 161 of the bottom cover 160b, and the above-mentioned materials for reinforcing strength of the bottom cover 160b are formed. By installing the first and second reinforcing bars (200a, 200b) of the weight of the bottom cover (160b) can be reduced. Therefore, the overall weight of the liquid crystal display device having the bottom cover 160b can be reduced.

At this time, the number of the first and second reinforcing bars 200a and 200b provided on the bottom of the bottom cover 160b is not limited to two as shown.

4 is a view illustrating another embodiment of the bottom cover of FIG. 2.

As shown in FIG. 4, the bottom cover 260b includes a bottom part 261 and first to fourth side parts 262 to 265 extending from four sides of the bottom part 261. The first to fifth reinforcement bars 300 and 310a to 310d made of different materials are positioned on the bottom of the bottom cover 260b. An opening area OP exposed in a quadrangular shape is formed in the bottom portion 261 of the bottom cover 260b.

The first to fifth reinforcement bars 300 and 310a to 310d may be made of any one of the above materials.

As described above, the opening region OP is formed in the bottom portion 261 of the bottom cover 260b, and the reinforcement is made of a material having a lower density than that of aluminum (Al) to reinforce the strength of the bottom cover 260b. A bar may be installed on the bottom of the bottom cover 260b to reduce the weight of the bottom cover 260b. Therefore, the overall weight of the liquid crystal display device having the bottom cover 260b can be reduced.

Although the present invention has been described with reference to the embodiments illustrated in the drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

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

2 is a view showing in detail the bottom cover of FIG.

3 is a plan view of the bottom cover of FIG.

4 is a view showing another embodiment of the bottom cover of FIG.

<Brief description of the main parts of the drawing>

100 liquid crystal display panel 101 first substrate

103: second substrate 110: gate driver

120: data driver 130: backlight unit

140: optical sheet 150: light guide plate

160: storage container 160a: mold frame

160b, 260b: bottom cover 161, 261: bottom

162 to 165, 262 to 265: first to fourth side parts

170: light source array 170a: light source

170b: printed circuit board 180: reflective sheet

190: top case 200a, 200b: first and second reinforcing bars

300, 310a to 310d: first to fifth reinforcing bars

Claims (10)

A light source array for generating light; A light guide plate spaced apart from the light source array at a predetermined interval and including a light incident part to receive light generated from the light source array; An optical sheet positioned on the light guide plate to improve optical characteristics of light emitted from the light guide plate; A bottom cover for storing and fixing the light source array, the light guide plate, and the optical sheets; And A reinforcing bar positioned on a rear surface of the bottom cover to reinforce the strength of the bottom cover; And the bottom cover includes a bottom part having first to fourth opening areas with a predetermined portion and first to fourth side parts extending from four surfaces of the bottom part. The method according to claim 1, The first and second opening regions of the first to fourth opening regions are formed in a trapezoidal shape, and the third and fourth opening regions are formed in a triangular shape. The method of claim 2, The trapezoidal first opening region has a lower side of 660 mm, a height of 160 mm, an upper side of about 300 mm, and a curved surface at both ends of the upper side of 100 mm. The method of claim 2, The trapezoidal second opening region has a lower side of 740 mm, a height of 180 mm, an upper side of about 340 mm, and a curved surface of both ends of the upper side is 100 mm. The method of claim 2, The triangular third opening region has a lower side of 360 mm, a height of 260 mm, the triangular fourth opening region has a lower side of 360 mm, and a height (H22) of 260 mm. The method according to claim 1, The reinforcing bar is a back light unit, characterized in that made of wood plywood or wood. The method according to claim 1, The reinforcing bar is a backlight unit, characterized in that made of plastic. The method according to claim 1, The reinforcing bar is a backlight unit, characterized in that the wire mesh structure. The method according to claim 1, The reinforcing bar is a backlight unit, characterized in that made of magnesium material. A light source array for generating light; A light guide plate spaced apart from the light source array at a predetermined interval and including a light incident part to receive light generated from the light source array; An optical sheet positioned on the light guide plate to improve optical characteristics of light emitted from the light guide plate; A liquid crystal display panel displaying an image using light generated from the light source array; A bottom cover configured to receive and fix the light source array, the light guide plate, the optical sheets, and the liquid crystal display panel; And A reinforcing bar positioned on a rear surface of the bottom cover to reinforce the strength of the bottom cover; And the bottom cover includes a bottom portion having first to fourth opening regions having a predetermined portion and first to fourth side portions extending from four surfaces of the bottom portion.

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