KR20110078683A - Backlight unit and display device having the same - Google Patents

Abstract

PURPOSE: A backlight unit and a display device having the same are provided to embody a display screen with high contrast ratio. CONSTITUTION: A backlight unit of a display device comprises a plurality of light source which are installed along a longitudinal direction of a substrate to a predetermined interval, a light incident part(331) which receives light from the light source, and a light guide plate which is arranged in parallel with a plurality of row and columns. The light guide plate comprises a plurality of reflection sheets which is placed on the lower part of the light guide plate.

Description

BACKLIGHT UNIT AND DISPLAY DEVICE HAVING THE SAME}

The present invention relates to a backlight unit and a display device having the same.

The present invention relates to a display device. The display device is a device that receives image information from the outside and displays it, such as a television or a monitor. The display device is a concept including all devices that receive and display image signals from the outside.

Conventional CRT (display device for making a visible image using electrons emitted from a cathode ray as a high vacuum electron tube, ie, a cathode in a vacuum) type display device has recently been used in liquid crystal display (LCD). PDP (Plasma Display Panel) or PDP (Plasma Display Panel) using a gas discharge (plasma) phenomenon panel using electric elements that change and transmit various electrical information generated by various devices using visual change The display device using a back light is being rapidly replaced, and the LCD or PDP type display device has been innovatively reduced in thickness compared to the conventional CRT display device.

In particular, in the LCD display device, the area of the display panel on which an image is displayed increases, but its thickness and weight continue to decrease.

The LCD display device may include a backlight unit, and the light sources of the backlight unit include EL (Electro Luminescence), CCFL (Cold Cathode Fluorescent Lamp), HCFL (Hot Cathode Fluorescent Lamp), and LEDs. In particular, the light emitting diode (LED) as a light source has strengths in thickness, weight, power consumption, color expression power, etc. of the light source, compared to the conventional CCFL.

Therefore, in recent years, LED is adopted as a light source of a unit of a backlight.

Accordingly, a direct method in which light provided from the LED is supplied in a direction perpendicular to the light guide plate and an edge method in which light is incident on the side of the light guide plate are introduced.

Each approach has advantages and disadvantages in terms of brightness size, cost or the possibility of segmentation. Therefore, when employing LED as a light source of the backlight unit that provides an illumination function of the LCD display device, it is possible to consider a new method having the advantages of both direct and edge methods, respectively. That is, a method of configuring the backlight unit as a set of several backlight modules is possible.

In this case, in the case of modularizing each of the components constituting the backlight unit, the modular backlight module may cause a brightness deviation depending on the position of the LED or the like as the light source. The LEDs can be placed tightly to eliminate the brightness deviation, but the cost and heat generation problems are likely to occur.

 Therefore, even when a suitable number of LEDs are arranged apart from each other, there is a need for a method capable of minimizing brightness variation of each backlight module constituting the backlight unit.

The present invention can reduce the thickness of the display device, minimize the brightness variation of each backlight module constituting the backlight unit, can be actively applied to the size change of the display device, and to apply local dimming (Local Dimming) It is an object of the present invention to provide a backlight unit capable of realizing a screen having a high contrast ratio and a display device having the same.

In order to solve the above problems, the present invention is at least one light source unit including a substrate and a plurality of light sources mounted at predetermined intervals along the longitudinal direction of the substrate, the light incident portion to which the light generated from the light source of the light source unit is incident And a light guide part connected to the light incident part and having a step, and the light incident from the light incident part exiting in an upward direction, and arranged in a plurality of columns and adjacent to each other in a plurality of rows, and provided below the light guide plate. A backlight unit includes a plurality of reflective sheets, and includes at least one lens portion recessed or convexly protruding from a light incident portion of the light guide plate.

The side surface of the light incident part of the light guide plate may be divided into an incident area facing the light source of the light source part and a separation area spaced apart from the incident area, and the lens part may be provided in the incident area.

In addition, a plurality of lens units may be formed in at least one incident region among the incident regions.

The plurality of lens units may be concave recessed lens units.

Here, the plurality of lens parts may be formed with concave recessed lens parts and convexly protruding lens parts.

In addition, the convexly protruding lens portion and the concave lens portion may be dispersed and formed.

In addition, a plurality of concave recessed lens parts may be formed in the center of the incident area, and the convexly protruding lens parts may be formed around a plurality of concave recessed lens parts formed in the center of the incident area.

Here, the inner surface of the concave recessed lens portion or the outer surface of the convexly protruding lens portion may be configured as a curved surface.

In addition, the light emitting part of the light guide plate may include a portion where the thickness is gradually changed.

The light source of the light source unit may be an LED, and the thickness of the light incident unit of the light guide plate may correspond to the thickness of the LED.

In addition, in order to solve the above problems, the present invention is a light source unit including a display panel, a substrate and a plurality of light sources disposed at predetermined intervals along the longitudinal direction of the substrate, the light incident from the light source of the light source unit is incident A plurality of backlight modules including a light guide plate connected to a light part and the light incident part, and a light emitting part to emit light incident from the light incident part in an upward direction; and a plurality of backlight modules including a reflective sheet provided below the light guide plate. And a driving unit mounted to be arranged in a plurality of rows and a plurality of rows, the rear chassis including the plurality of connection holes and the driving unit including at least one substrate on the rear surface of the rear chassis, and at least one of the plurality of backlight modules. Concave or on the side of the light incident part of the light guide plate of the backlight module Rokhan lens portion provides a display device including a plurality of.

The present invention can reduce the thickness of the overall backlight unit by manufacturing a structure in which the light emitting diode is disposed on the side of the light guide plate, thereby reducing the thickness of the display panel, such as LCD, and modularizes the backlight unit combined with the light guide plate and the light emitting diode. By assembling and assembling a plurality of modules in a tiling manner, a backlight unit suitable for a large screen display may be provided.

In addition, the backlight unit according to the present invention is composed of a plurality of backlight modules, it is possible to minimize the brightness variation for each area of each backlight module.

In addition, the present invention can apply a local dimming that can partially drive the backlight module constituting the backlight unit and the light source constituting the backlight module according to the image screen having a high contrast ratio (Contrast Ratio) There is an effect that can be implemented.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the invention is not limited to the embodiments described herein but may be embodied in other forms. Rather, the embodiments disclosed herein are provided so that the disclosure can be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Like numbers refer to like elements throughout.

1 illustrates a display apparatus 500 according to the present invention. In more detail, FIG. 1A illustrates a front perspective view of the display apparatus 500 and FIG. 1B illustrates a rear perspective view of the display apparatus 500.

In general, the display apparatus includes a stand 200 including a main body 100 on which an image is displayed, a neck part 210 supporting the load of the main body 100, and a base part 260 distributing the load of the main body 100. ) May be included. The main body 100 of the display apparatus 500 may include a display panel 110 for displaying an image therein, and may include a front cover 120 (or a front filter) on the front thereof, and the display. The rear surface of the panel 110 is shielded by the rear cover 130.

The display panel 110 may be an LCD panel.

In the embodiment shown in Figure 1, the display apparatus main body 100 is shown an example that is mounted by a stand, it may be mounted in a wall-mounted manner. Recently, since the thickness of the display apparatus 500 is becoming thinner and thinner, the display apparatus 500 is also mounted in a wall-mounted manner.

One of the reasons that the thickness of the main body 100 of the display apparatus 500 may be slim is that the thickness of the backlight unit itself is reduced.

Hereinafter, a backlight unit or a display device having the same according to the present invention will be described in more detail with reference to FIG. 2.

2 is an exploded perspective view of the main body 100 of the display device according to the present invention. 2 illustrates a liquid crystal display device.

As shown in FIG. 2, the display device according to the present invention includes a liquid crystal panel (LCD PANEL) 110 as a display panel on which an image is displayed, a backlight unit 400 for supplying light, the liquid crystal panel 110, and a backlight unit. It may include a front cover 120 and the rear cover 130 for receiving and protecting the 400.

The backlight unit 400 of the display apparatus according to the present invention may further include a plurality of optical sheets 150 provided on the back of the display panel. The optical sheet 150 may be provided to provide optical effects such as diffusing light.

The backlight unit 400 includes a plurality of backlight modules 300 arranged in a plurality of rows and columns. The backlight unit 400 may be mounted while the light exit surface of the backlight module 300 forms the same plane.

3 illustrates a backlight unit and a rear chassis according to the present invention. More specifically, FIG. 3 (a) is a perspective view of a process in which the backlight module 300 of the backlight unit 400 according to the present invention is partially removed or mounted, and FIG. 3 (b) is a backlight module 300. Top view of the rear chassis to be mounted.

The backlight module 300 may be seated in a plurality of columns and rows on the rear chassis 170 constituting the rear surface of the backlight unit 400, and may be fixed to the rear chassis by a fastening member or the like.

The rear chassis 170 may have a plurality of elongated mounting grooves g formed at a predetermined interval in parallel. The mounting groove g is a portion on which a protruding portion of a substrate (not shown) constituting each backlight module 300 or a lower bracket (if provided) is seated. Therefore, the position of the substrate constituting the backlight unit 300 and the position of the mounting groove g may correspond to each other.

The rear surface of the rear chassis 170 may be provided with driving units P1 and P2 for driving the backlight module 300 constituting each backlight unit 400. The driving units P1 and P2 may be configured in the form of a substrate on which various components are mounted.

In addition, the rear chassis 170 may be provided with a plurality of connection holes h. The connection hole h is a hole for connecting a substrate (not shown) constituting the backlight unit 300 to the driving units P1 and P2. A substrate (not shown) constituting the driving units P1 and P2 and the backlight unit 300 is connected by a cable or a flexible substrate, and the cable or flexible substrate passes through the connection hole h. It may be connected to the driving units (P1, P2).

In addition, when the mounting groove h is formed in the rear chassis 170 by the structure of the substrate or the like protruding from the bottom of the backlight module 300, the connection hole h is formed in the mounting groove g. can do. When the connection hole h is formed in the mounting groove g, the connection terminal (to be described later) and the driving unit provided on the lower surface of the substrate are connected to the driving units P1 and P2 through the connection hole h. ) Can be connected.

As shown in FIG. 3, a plurality of connection holes h may be provided in one mounting groove g. That is, since a plurality of substrates are mounted in one mounting groove g, a plurality of connection holes h may be provided in one mounting groove g for connection with each substrate.

Since one mounting groove h corresponds to the plurality of backlight modules 300, as shown in FIG. 3, one mounting groove h may have a length corresponding to the entire width of the rear chassis. A number of backlight modules corresponding to the entire width of the rear chassis 170 may be seated and mounted in the same mounting groove h.

Of course, the position of the connection hole h may be variously modified according to the position of the connection terminal of each substrate. That is, if the connection terminal is not provided on the lower surface of the substrate may not be provided with a connection hole in the mounting groove. If the substrate constituting the light source unit does not protrude downward, the mounting groove may not be necessary, and the position of the connection hole may be freely selected.

In addition, the backlight module 300 is not limited to being mounted horizontally, but may be mounted in a vertical direction. In the latter case, the direction of the mounting groove h may also be formed in a vertical direction.

As described above, the method of forming the mounting groove h in the rear chassis 170 may facilitate positioning on the upper side of the rear chassis 170 of the backlight module 300 constituting the backlight unit 400. The backlight module 300 may be prevented from being separated from the rear chassis 170 by an external impact.

In addition, since the connection hole h and the like may be independently connected to each of the backlight modules 300 and the driving unit mounted on the rear surface of the rear chassis 170, the divided driving of each backlight module 300 is possible. Therefore, the contrast of the backlight unit may be adjusted for each region.

4 is a top perspective view and a bottom perspective view of the light source unit 350 of the backlight module 300 constituting the backlight unit according to the present invention.

The light source unit may include a plurality of light sources and a substrate 353 on which the light sources are mounted. The light source may be a light emitting diode device (LED) 353. The LED 353 generates a small number of carriers (electrons or holes) injected using a pn junction structure of a semiconductor, and emits light by recombination thereof, thereby reducing power consumption and improving light brightness and lifespan. Improvements were made.

The LEDs 353 may be mounted to be spaced apart from each other along the longitudinal direction of the substrate 351, and may be mounted to emit light in a direction parallel to the upper surface of the substrate 351. That is, light can be emitted in the lateral direction of the light incident part of the light guide plate described later.

Since light is incident on the side surface of the LED 353, the light incident part of the light guide plate to which the light supplied from the LED 353 is guided may be disposed to face the side of the LED 353. This is described in detail later.

In addition, the substrate 351 of the light source unit may have a connection terminal 351c disposed on a lower surface thereof at a position corresponding to the connection hole h of the rear chassis 170. In other words, the driving unit (351c) of the substrate 351 is mounted on the back of the rear chassis 170 by exposing the connection terminal 351c through the connection hole h of the rear chassis 170 described above. P1, P2, see FIG. 3) for easy connection.

In addition, the driving units P1 and P2 on which the connection terminal 351c of the substrate is mounted on the rear surface of the rear chassis 170 may be connected to a cable or a flexible substrate FPCB.

The LEDs 353 of the light source unit 350 are spaced apart in the same direction as the longitudinal direction of the light guide plate, and a plurality of LEDs 353 are mounted.

5 is a perspective view of an exploded state of one backlight module 300 constituting the backlight unit 400 according to the present invention.

The backlight module 300 according to the present invention includes a light source unit 350 including a substrate 351 and a plurality of light sources disposed at predetermined intervals along a length direction of the substrate 351, and generated from a light source of the light source unit. The light guide plate 330 and the light guide plate which are connected to the light incidence part 331 and the light incidence part 331 and the light incidence part 335 is emitted from the light incidence part 331 to the upper surface direction. 330 may include a reflective sheet 340 provided below.

The light guide plate 330 supplies the light incident from the light incident part 331 to the liquid crystal panel side, and guides the light to the entire light guide plate and emits light toward the display panel to provide backlight illumination.

The light incident part 331 may protrude from the side surface of the light emitting part 335, and the light emitting part 335 may include a portion whose thickness gradually decreases away from the light incident part 331. It may be configured in the form of a wedge.

The light incident part 331 may protrude on the side surface of the light emitting part 335 and may have a predetermined height difference to have a step difference.

For convenience of description, the light emitting part 335 defines one end 3331 as an end to which the light incident part 331 has a step and is connected to the other end 3353.

In this case, the light incident part 331 is protruded and has a step on the side surface 3331 s of one end 3331 of the light emitting part 335. The side surface 3331s of one end 3331 of the light emitting part 335 has a step downward and is connected to the light incident part 331.

The side surface 331S of the light incident part 331 serves as an incident surface on which light generated by the LED 353 of the light source part 350 is incident. The reason for having a step downward by the side surface 3331s of one end 3331 of the light emitting part 335 and being connected to the light receiving part 331 is that the thickness of the LED 353 and the incident surface, that is, the light receiving part 331 This is to match the thickness of the side surface 331S).

The thickness of the light incident part 331 may be elastically adjusted according to the thickness of the LED 353.

As described in the above description with reference to FIG. 4, the LED 353 constituting the light source unit 350 projects light toward the side of the light incident unit 331 of the light guide plate 330. Therefore, the light guide plate 330 should be disposed adjacent to the side of the light incident portion 331.

The light guide plate 330 may be formed of a transparent acrylic resin, polymethylmethacrylate (PMMA), polyethylene, polycarbonate, or the like, and the thickness thereof becomes thinner toward one end 3335 of the light emitting unit 335. .

In addition, the backlight module of the present invention surrounds the upper bracket 360 and the substrate 351 surrounding at least a part of the light incident part 331 of the light guide plate 330, and a lower bracket 380 mounted on the rear chassis 170. ) May be included.

The upper bracket 360 has the light source disposed adjacent to the light incident portion side of the light guide plate, shields the light incident portion and the light source of the light guide plate, and binds the light guide plate.

The lower bracket 380 is disposed below the light incident part of the light guide plate 330, and is coupled to the upper bracket and the light guide plate to bind the backlight module 300 together with the upper bracket 360. do.

In addition, the backlight module 330 according to the present invention may include a lower bracket 380 on which a substrate constituting the light source unit 350 is mounted, supports a part of the light guide plate, and is mounted on the rear chassis 170. have.

The reflective sheet 340 may be provided between the lower surface of the light guide plate 330 and the light source unit 350. The reflective sheet 340 may include a plurality of through holes 341 through which the LEDs 353 constituting the light source unit 350 pass.

Therefore, the reflective sheet 340 provided between the lower surface of the light guide plate 330 and the light source unit 350 is constrained thereto when the light guide plate 330 and the light source unit 350 are bound to each other, and thus, a separate fastening member or the like. You do not need this.

5B may further include a reflective member 370 on an upper surface of the light incident part 331 of the light guide plate 330.

The light incident part 331 is disposed in close proximity to the LED 353 of the light source unit 350, and is provided to effectively transmit the incident light to the light emitting unit 335. The reflective member 370 reflects the light emitted from the upper portion of the light incident portion 331 among the light supplied from the LED 353 to supply the light toward the light emitting portion 335.

The reflective member 370 may be provided in a manner that is attached to the upper surface of the light incident part 331.

6 illustrates one embodiment of a light guide plate constituting the backlight module 300 according to the present invention. More specifically, FIG. 6A is a perspective view of the light guide plate 330, and FIG. 6B is an enlarged view of the light incident part 331 side surface 331S of the light guide plate 330.

The present invention includes at least one light source unit 350 including a substrate and a plurality of light sources mounted at predetermined intervals along a longitudinal direction of the substrate, and a light incident unit to which light generated from the light source of the light source unit 350 is incident ( 331 and a light emitting unit 335 connected to the light receiving unit 331 and having a level difference, and the light incident from the light receiving unit 331 is emitted in an upward direction, and is adjacent to a plurality of columns and a plurality of rows. A lens including a light guide plate 330 arranged, and a plurality of reflective sheets provided below the light guide plate, and recessed or convexly protruded in the side surface 331S of the light incident part 331 of the light guide plate 330. Provided are at least one additional backlight unit.

In the embodiment shown in FIG. 6, it is shown that a plurality of lens parts are provided on the side of the light incident part of the light guide plate 330.

The side surface 331S of the light incident portion 331 of the light guide plate 330 is spaced apart from the incident region 331S (a) facing the LED 353 of the light source unit 350 and the incident region 331S (a). It may be partitioned into the separation area 331S (b). The incident region 331S (a) is a region facing the LED 353 and is a region where light is incident, and the separation region 331S (b) is a region between the incident regions 331S (a). it means.

Accordingly, light is not incident on the separation region 331S (b), and light is incident on the incident region 331S (a).

The incident region 331S (a) may have an area corresponding to the width of each LED 353. Accordingly, the incident region 331S (a) and the separation region 331S (b) may be repeatedly arranged, and the incident region 331S (a) and the separation region 331S (b) may be disposed in the light source unit. It may be changed according to the interval of the LED 353 constituting the 350. That is, as shown in FIG. 4, the interval of the incident region 331S (a), that is, the interval of the separation region 331S (b), is changed according to the interval of the LED 353 constituting the light source unit 350. Can be determined.

As illustrated in FIG. 6, a plurality of lens units may be formed in the incident region 331S (a). The lens unit formed on the side surface 331S of the light incidence part 331 of the light guide plate 330 of the present invention may be provided in a concave recessed or convex projecting shape. In general, concave lenses scatter light, and convex lenses converge light.

That is, the concave lens plays a role of dispersing light to the surroundings, and the convex lens can converge the light to improve the light propagation.

6B, the lens portion 331g formed on the side surface 331S of the light incident portion 331 of the light guide plate 330 has a concave recessed shape.

The concave recessed lens part 331g is provided in the incident area 331S (a) to disperse the light incident from the LED 353, thereby minimizing the brightness deviation caused by the spaced area 331S (b). Can be.

That is, the portion corresponding to the separation region 331S (b) is a region where no light is incident on the side surface 331S of the light incident portion 331, and since the light is not incident when the LED 353 is turned on, It may look relatively dark. That is, light and dark may be repeated in portions corresponding to the incident region 331S (a) and the spaced region 331S (b).

Therefore, a concave lens portion 331g is formed in a portion corresponding to the incident region 331S (a), so that the light incident from the incident service is also diffused toward the separation region 331S (b), so that the incident region 331S is provided. It is possible to mitigate variations in light and dark of portions corresponding to (a)) and the separation region 331S (b).

7 illustrates a side surface 331S of the light receiving portion 331 of other embodiments of the light guide plate 330 of the present invention.

Descriptions duplicated with the description with reference to FIG. 6 will be omitted. 6 shows an example in which only the concave lens portion 331g in which the shape of the lens portion formed in each incident region 331S (a) is concave is formed.

However, the embodiment shown in FIG. 7 shows that the lens portion formed in the incident region 331S (a) on the side of the light incident portion of the light guide plate is configured with the concave lens portion and the convex lens portion.

In detail, FIG. 7A illustrates a concave concave lens part 331g concentrated at the center of the incident region 331S (a), and is formed to surround the convex convex lens part around the concave lens part 331g. Can be.

Since the LED constituting the light source unit 350 is provided in a state in which a light emitting device is packaged therein, the LED constituting the light source unit 350 may have a variation in brightness itself of the side surface of the LED 353.

Therefore, in the embodiment illustrated in FIG. 7A, the concave lens portion 331g formed at the center of the incident region 331S (a) disperses light generated from the LED chip to some extent, Since the convex lens portions 331P formed around the concave lens portion 331g have a relatively small amount of incident light, the convex lens portions 331P converge light to reach the light emitting portion of the light guide plate.

Since the LED 353 is generally packaged with an LED chip, a brightness deviation may occur at a side surface of the light exit surface, and the brightness variation may be an incident region 331S (a) of the side surface 331S of the light incident portion 331. It can be relaxed by the lens portion formed in the).

FIG. 7B shows a convex lens portion 331P and a concave lens portion 331g in one incident region 331S (a) of the side surface 331S of the light incident portion 331 as in FIG. 7A. Although it is common in that it is provided, there exists a difference in that each convex lens part 331P and the concave lens part 331g are distributed and provided.

That is, a concave lens portion 331g is provided between the convex lens portions 331P formed to be dispersed to alleviate the brightness deviation that may occur in the light exit surface of the LED 353 and at the same time enter the light incident portion of the light guide plate. Light incident to the region 331S (a) may be more efficiently transmitted to the light emitting part of the light guide plate.

The embodiment illustrated in FIG. 7 corresponds to some examples of the lens unit that may be formed on the side of the light incident unit of the light guide plate, and the lens unit may be configured in more various ways.

For example, a portion of the light incident portion 331 of the light guide plate 330 in which the light generated by the LED 353 is concentrated is formed in the concave lens portion 331g and relatively light. The portion of which is less incident may have the convex lens portion 331P. The inner surface of the concavely recessed lens unit or the outer surface of the convexly protruding lens unit may be configured as a curved surface. This is to maximize the dispersion or convergence of light due to the lens effect.

8 is a cross-sectional view of an assembled state of the backlight module illustrated in FIG. 5.

As described above, the light guide plate 330 constituting the backlight module 300 has a step connected to the light incident part 331 to which the light emitted from the LED 353 is incident and the light incident part 331. The light emitting unit 335 is partitioned.

The LED 353 constituting the light source unit 350 emits light toward the side surface 331S of the light incidence unit 331 of the light guide plate 330, and the substrate 331 on which the LED 353 is mounted A part of the light incident part 331 is supported, and a bottom surface thereof protrudes downward.

The light guide plate 330 may include an upper bracket 360 surrounding at least a part of the light incident part 331 and a lower bracket 380 that surrounds the substrate 351 and is mounted on the rear chassis 170.

The lower bracket 380 surrounding the lower portion of the substrate 351 has a seating portion (depressed portion) on an upper surface corresponding to the shape of the substrate 351, and a lower surface thereof protrudes downward.

Therefore, the lower frame 380 is provided with a mounting portion on which the substrate 351 of the light source unit 350 is mounted, and the light guide plate disposed above the substrate 351 in a state where the substrate of the light source unit is mounted on the mounting unit. The light incident part 331 is fastened.

Since the protruding lower surface of the lower bracket 380 is seated and mounted in the mounting groove (g, see FIG. 3) of the rear chassis, the position can be easily determined in the process of mounting on the rear chassis 170.

In the light incident part 331, end portions 3353 of the light emitting part 335 of the light guide plate adjacent thereto are stacked. The side surface 331S of the light incident part 331 is disposed to face the LED 353. As described above, the LEDs 353 constituting the light emitting unit 350 are mounted on the substrate 351 and spaced apart from each other at predetermined intervals. Therefore, whether the light incident on the side surface 331S of the light incident portion 331 is the incident region 331S (a) or the spaced region 331S (b) of the side surface 331S of the light incident portion 331. As a result, the amount of incident light varies significantly, and light and dark portions are generated depending on the position of the region.

Therefore, the above-mentioned concave recessed lens portion or convexly protruding lens portion is provided on the side surface of the light incident portion 331 of the light guide plate, thereby minimizing brightness variation. That is, the light is emitted from the LED 353 by the concave lens portion 331g to diffuse the light into the peripheral separation region 331S (b), and to reinforce the linearity of the light by the convex lens portion 331P. The diffusion of light into the entire region of the light emitting portion 335 of the light guide plate 330 may be achieved.

9 is a sectional view showing a mounting state when the backlight module of the present invention is mounted in an adjacent state.

The K + 1 backlight module 300 (K + 1) and the K-th backlight module 300 (K) are adjacent backlight modules in which the number of backlight modules constituting one backlight unit is N and the light guide plate is partially overlapped. Assume that

Each of the K + 1 th backlight module 300 (K + 1) and the K th backlight module 300 (K) is a K + 1 light guide plate 330 (K + 1) and a K th light guide plate 330 (K), respectively. )).

As shown in FIG. 9, an end portion of the light emitting part 335 of the K + 1th light guide plate 330 (K + 1) extends and is stacked above the light incident part of the Kth light guide plate 330 (K). The light source unit 350 of the K-th backlight module 300 (K) is shielded.

As shown in FIG. 9, the other end portion 3331 of the end portion of the light emitting portion 335 of the light guide plate 330 adjacent to the light incident portion 331 is disposed.

Therefore, the light emitting portion 335 of the light guide plate 330 is minimized by such an arrangement, and may be arranged in a plurality of columns and rows.

The stepped structure of the light incident part 331 and the light emitting part 335 may minimize the boundary area between the light exit surface and shield the light source of the adjacent backlight module.

Here, the upper surface of the light emitting portion 335 of the K-th light guide plate 330 (K) has the same height as the upper surface of the light emitting portion 335 of the K + 1th light guide plate 330 (K + 1). It is preferable. Since the plurality of light guide plates 330 have the light exit surface of one display device, it is preferable not to have a height difference.

10 illustrates a cross-sectional view of a display apparatus employing a backlight unit according to the present invention.

The present invention is generated from a light source unit 350 and a light source of the light source unit 350 including a display panel, a substrate 351 and a plurality of light sources 353 arranged at predetermined intervals along a longitudinal direction of the substrate 351. A light guide plate 330 connected to the light incident part 331 to which the received light is incident and the light incident part 331, and a light emitting part 335 to emit light incident from the light incident part 331 in an upward direction; The plurality of backlight modules 300 including the reflective sheet 340 provided under the light guide plate 330, the plurality of backlight modules 300 are mounted to be arranged in a plurality of rows and a plurality of rows, a plurality of connection holes And a driving unit (P) including a rear chassis (170) having a bottom surface and at least one substrate provided on a rear surface of the rear chassis (170), and at least one backlight of the plurality of backlight modules (300). Light guiding of module 300 Provided is a display apparatus 500 in which a plurality of concave or convex lens portions (not shown) are provided on a side of a light incident portion of a plate.

A liquid crystal panel 110 as a display panel is provided to display an image, and a plurality of optical sheets 150 may be provided under the display panel, and a backlight unit 400 may be provided under the optical sheet 150.

In general, the LCD display device includes a rear chassis 170 under the backlight unit 400. In addition, a driving unit P having various driving circuits or power circuits may be provided on the rear surface of the rear chassis 400.

The driving unit P may be mounted on a rear surface of the rear chassis 170 to drive or control the backlight unit or the liquid crystal panel.

As already described, the plurality of light guide plates may constitute a light guide plate array such that the light exit surface of the light guide plate forms the same plane.

In addition, the side surface 331S of the light incident part 331 substantially forms a vertical plane, and the plurality of lens parts described above may be provided to minimize variations in brightness at the light exit surface of the light guide plate 330.

Here, the light incident part 331 may have a thickness less than half of the thickness of one end of the light emitting part 335.

The light guide plate 330 has a structure in which the thickness thereof becomes thinner from one end 3331 to the other end 3335 of the light emitting unit 335, and the light exit surface, which is the upper surface of the light guide plate 330, consists of a horizontal plane. According to the thickness change of the light guide plate 330 and the thickness of the substrate 351, the shape of the lower surface of each backlight module 300 constituting the backlight unit 400 has a structure of repeating protrusion and depression at a predetermined interval. .

That is, the rear chassis 170 on which the light guide plate 330 and the substrate 351 having such a shape are mounted may have a structure of repeating protrusion and depression as shown in FIG. 10.

As described above, a connection hole is provided in the mounting groove of the rear chassis 170 and may be connected to the driving unit and the cable C or the flexible printed circuit board (FPCB) mounted on the rear surface of the rear chassis.

In addition, the lower surface s of the rear chassis connecting the mounting groove g and the mounting groove g formed on the rear chassis may form an inclined surface.

That is, the depth of the lower surface s of the rear chassis may be gradually changed in response to the decrease in the thickness of the light guide plate to form an inclined surface.

11 is a block diagram of a display device according to the present invention. Specifically, FIG. 11A is a cross-sectional view showing a schematic configuration of a display device, and FIG. 11B is a block diagram of a liquid crystal panel of the display device according to the present invention.

As shown in FIG. 11, the display apparatus 500 may be configured using the above-described backlight unit 400 and the liquid crystal panel 110.

Referring to FIG. 11, the liquid crystal panel 110 positioned on the backlight unit 400 according to the present invention includes a liquid crystal layer 110c injected between an upper substrate 110a and a lower substrate 110b facing each other. It is configured by.

One side of the liquid crystal panel 110 may be provided with a driving unit for driving the liquid crystal panel 110 or a connector (not shown) for connection with the driving unit.

In addition, referring to FIG. 13, a rear cover 130 covering the backlight unit 400 may be positioned and a front cover 120 covering the front surface of the liquid crystal panel 110 may be included above the liquid crystal panel 110. .

The liquid crystal panel 110 is arranged in a matrix form of the liquid crystal cells forming a pixel unit, and forms an image by adjusting the light transmittance of the liquid crystal cells according to the image signal information transmitted from the driver.

The driving unit may include a flexible printed circuit board (FPCB), a driving chip mounted on the flexible printed board, and a substrate (PCB) connected to the other side of the flexible printed board.

Meanwhile, as shown in FIG. 11, the backlight unit 400 is positioned behind the liquid crystal panel 110, and a plurality of optical sheets 150 may be provided on the backlight unit 400.

The optical sheet 150 may be disposed on the rear surface of the liquid crystal panel 110 and may include an optical sheet 150 including a diffusion sheet, a prism sheet, and a protective sheet.

Here, the diffusion sheet serves to diffuse the light from the backlight unit 400 and supply the light to the liquid crystal panel 110. The prism sheet has a triangular prism-shaped prism on the upper surface thereof. The prism sheet collects light diffused from the diffusion sheet in a direction perpendicular to the plane of the upper liquid crystal panel.

The micro-prism formed in such a prism sheet has made a predetermined angle. The light passing through the prism sheet almost passes vertically, providing a uniform luminance distribution. The uppermost protective sheet protects the prism sheet that is weak to scratches.

As illustrated in FIG. 11, a plurality of gate lines and a plurality of data lines are formed in a matrix form on the lower substrate 110a of the liquid crystal panel 110, and pixel electrodes and thin film transistors (Thin) are formed at the intersections of the gate lines and the data lines. Film Transistor (TFT) 110d is formed.

The signal voltage applied through the thin film transistor 110d is supplied to the liquid crystal layer 110c by the pixel electrode, and the liquid crystal layer 110c is aligned according to the signal voltage to determine the light transmittance.

The upper substrate 110b includes a color filter 110g formed of RGB pixels through which light passes, and a common electrode made of a transparent conductive material such as indium tin oxide (ITO) or indium zinc oxide (IZO). 110f) is formed. The alignment layer 110e may be positioned above and below the liquid crystal layer 110c.

The display apparatus 500 as described above may maximize its performance by using the above-described backlight unit 400.

12 is a block diagram showing a TV as an example of the display device according to the present invention.

The configuration of the display apparatus 500 is as illustrated in FIG. 36, and the broadcast data stream received from the tuner 510 is processed through the processor 520, the decoder 530, and the A / V output unit 540. The display device 500 is transferred to and displayed.

An operation of the tuner 510 or the processor 520 may be controlled through the controller 550, and the controller 550 may further include a memory 560.

If the user selects and designates an arbitrary broadcast channel by operating the liquid crystal TV 500 having such a configuration, the controller 550 controls the tuner 510 and the processor 520 to tune the corresponding broadcast channel, and the processor In 520, the data stream of the broadcast program provided through the broadcast channel is separated into audio and video data and output.

Then, the decoder 530 decodes the data output from the processing unit 520 into audio and video signals, and the audio and video signals are transmitted to the display apparatus 500 or the speaker unit through the A / V output unit 540. It can be output to the same audio output unit 570.

In this case, the backlight unit 400 is driven through the backlight driving unit P to display the screen output to the liquid crystal panel 110.

Meanwhile, the broadcast data stream delivered to the processor 520 may be provided through the internet.

As described above, the liquid crystal TV has been described in detail as an example of the display unit 500 including the backlight unit 400 and the above-described backlight unit 400 and the above-described display apparatus 500 according to the present invention.

The present invention can reduce the thickness of the overall backlight unit by manufacturing a structure in which the light emitting diode is disposed on the side of the light guide plate, thereby reducing the thickness of the display panel, such as LCD, and modularizes the backlight unit combined with the light guide plate and the light emitting diode. By assembling and assembling a plurality of modules in a tiling manner, it is possible to provide a backlight unit suitable for a large screen display, and is composed of a plurality of backlight modules. According to this, local dimming that can partially drive the backlight module constituting the backlight unit and the light source constituting the backlight module can be applied, thereby achieving a screen having a high contrast ratio. have.

In the present invention as described above has been described by the specific embodiments, such as specific components and limited embodiments and drawings, but this is provided to help a more general understanding of the present invention, the present invention is not limited to the above embodiments. For those skilled in the art, various modifications and variations are possible from these descriptions.

1 shows a display device according to the invention.

2 is an exploded perspective view of a main body of a display apparatus according to the present invention.

3 illustrates a backlight unit and a rear chassis according to the present invention.

4 is a top perspective view and a bottom perspective view of a light source unit of the backlight module constituting the backlight unit according to the present invention.

5 is an exploded perspective view of a backlight module constituting the backlight unit according to the present invention.

6 illustrates one embodiment of a light guide plate of the backlight module of the present invention.

7 illustrates another embodiment of the light guide plate of the backlight module of the present invention.

8 illustrates a cross-sectional view of one embodiment of a backlight module of the present invention.

9 is a sectional view showing a state where the backlight module of the present invention is adjacently mounted.

10 is a sectional view of an example of a display device according to the present invention.

11 is a block diagram of a display device according to the present invention.

12 is a block diagram showing a TV as an example of the display device according to the present invention.

Claims (11)

At least one light source unit including a substrate and a plurality of light sources mounted at predetermined intervals along a longitudinal direction of the substrate; And a light incident part to which light generated from a light source of the light source part is incident, and a light emitting part connected to the light incident part with a step difference, and the light incident from the light incident part exiting in an upward direction, and adjacent to a plurality of columns and a plurality of rows. A light guide plate arranged to be; And, It includes; a plurality of reflective sheet provided on the lower light guide plate, And at least one lens unit recessed or convexly protruding from a light incident plate side of the light guide plate. The method of claim 1, And a side surface of the light incident part of the light guide plate is divided into an incident area facing the light source of the light source part and a spaced area spaced apart from the incident area, and the lens part is provided in the incident area. The method of claim 2, And at least one incident region among the incident regions is formed with a plurality of lens units. The method of claim 3, The plurality of the lens unit is a backlight unit, characterized in that the recessed lens portion. The method of claim 3, The plurality of the lens unit is a backlight unit, characterized in that the concave recessed lens portion and the convexly projected lens portion is formed together. The method of claim 5, And a convexly protruding lens portion and a concave recessed lens portion are dispersed. The method of claim 5, The plurality of concave recessed lens portion is formed in the center of the incident region, the convexly projected lens unit is formed around the plurality of concave recessed lens portion formed in the center of the incident region backlight unit . The method of claim 1, And an inner surface of the concavely recessed lens portion or an outer surface of the convexly protruding lens portion is curved. The method of claim 1, The light emitting unit of the light guide plate is characterized in that it comprises a portion that gradually changes in thickness. The method of claim 1, The light source of the light source unit is an LED, the thickness of the light incident portion of the light guide plate, the backlight unit, characterized in that corresponding to the thickness of the LED. Display panel; A light source unit including a substrate and a plurality of light sources disposed at predetermined intervals along a longitudinal direction of the substrate, a light incident part to which light generated by the light source of the light source is incident, and light connected to the light incident part and incident from the light incident part A plurality of backlight modules including a light guide plate having a light emitting part emitted in the upper surface direction, and a reflective sheet provided under the light guide plate; A rear chassis having a plurality of backlight modules arranged in a plurality of columns and a plurality of rows and having a plurality of connection holes; And It includes a drive unit including at least one substrate provided on the rear chassis back, And a plurality of concave or convex lens parts on side surfaces of the light incidence part of the light guide plate of at least one of the backlight modules.

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