KR20130053568A - Backlight unit and display apparatus thereof - Google Patents

Abstract

The present invention relates to a backlight unit and a display device having the same, the backlight unit comprising: a substrate; A light emitting element formed on the substrate; And a reflecting plate disposed on an upper side of the substrate and having an embossed pattern having a convex shape in an upward direction, wherein the light emitting element is disposed in a space between the embossed pattern of the reflecting plate and the substrate and includes a plurality of light passing through the light emitting element. Holes are formed in the relief pattern.

Description

Backlight unit and display apparatus using the same

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

(PDP), Electro Luminescent Display (ELD), Vacuum Fluorescent Display (VFD), and the like have been developed in recent years in response to the demand for display devices. Display) have been studied and used.

Among them, the liquid crystal panel of the LCD includes a liquid crystal layer and a TFT substrate and a color filter substrate facing each other with the liquid crystal layer interposed therebetween, and have no self-luminous power to display an image using light provided from the backlight unit. can do.

An object of the present invention is to provide a backlight unit that is easy to manufacture and a display device using the same.

A backlight unit according to an embodiment of the present invention, a substrate; A light emitting element formed on the substrate; And a reflecting plate disposed on an upper side of the substrate and having an embossed pattern having a convex shape in an upward direction, wherein the light emitting element is disposed in a space between the embossed pattern of the reflecting plate and the substrate and is emitted from the light emitting element. A plurality of holes through which light passes are formed in the relief pattern.

A display device according to an embodiment of the present invention, the backlight unit; And a display panel disposed above the backlight unit, wherein the backlight unit comprises: a substrate; A light emitting element formed on the substrate; And a reflecting plate disposed on an upper side of the substrate and having an embossed pattern having a convex shape in an upward direction, wherein the light emitting element is disposed in a space between the embossed pattern of the reflecting plate and the substrate and is emitted from the light emitting element. A plurality of holes through which light passes are formed in the relief pattern.

According to an embodiment of the present invention, the manufacturing cost of the backlight unit may be reduced by eliminating the lens structure of the light source, and the appearance of the display apparatus may be improved by reducing the thickness of the backlight unit.

1 is a rear perspective view of the display device.
2 is an exploded perspective view showing an embodiment of the configuration of the display device.
3 is a diagram illustrating an embodiment of a configuration of a backlight unit.
4 is a cross-sectional view showing a detailed configuration of a portion A shown in FIG. 3.
5 is a perspective view showing the configuration of a reflecting plate according to an embodiment of the present invention.
6 is a perspective view illustrating an embodiment of a structure of an embossed pattern formed on the reflector.
7 is a perspective view illustrating a configuration of a backlight unit according to an embodiment of the present invention.
8 is a view for explaining the function of the embossed pattern.
9 is a cross-sectional view illustrating a configuration of a display device according to an embodiment of the present invention.
10 is a perspective view illustrating a configuration of a display device according to an embodiment of the present invention.
11 is an exploded perspective view showing the configuration of a display device according to an embodiment of the present invention.

Hereinafter, the present invention will be described with reference to the accompanying drawings. Hereinafter, the embodiments may be modified into various other forms, and the technical scope of the embodiments is not limited to the embodiments described below. The embodiments are provided so that this disclosure may be more fully understood by those skilled in the art. Accordingly, the shapes and sizes of the elements in the drawings and the like can be exaggerated for clarity.

1 is a rear perspective view of an embodiment of a configuration of a display apparatus.

Referring to FIG. 1, the display device 1 is provided outside of the display unit 10 and the display unit 10 on which an image is displayed to support the display unit 10 with respect to the bottom surface of the display unit 10. And a control module 20 for generating a power and video signal for operation and a cable 30 for a display device for transmitting the power and the video signal generated by the control module 20 to the display unit 10. Can be.

At this time, the control module 20 is supplied with external power, the power control unit 223 for converting the driving power for driving the display unit 10 and the main control unit for generating an image signal for driving the display unit 10 224.

In addition, the control module 20 may be provided in a separate configuration from the display unit 10 to support the display unit 10 with respect to the bottom surface.

For example, the display unit 10 according to an exemplary embodiment of the present invention does not include a separate power supply unit or a main controller for image signal processing, and fixes and protects the display module displaying an image and the display module. By including the protective components, the thickness of the display unit 10 can be reduced.

2 is an exploded perspective view illustrating an embodiment of a configuration of a display device.

Referring to FIG. 2, the display unit 10 of the display apparatus 1 is provided with a display panel 12 on which an image is displayed and a backlight provided behind the display panel 12 to provide a light source to the display panel 12. Unit 15 may be included.

In addition, the display unit 10 is provided between the front frame 11 surrounding the front edge of the display panel 12, the backlight unit 15, and the display panel 12 to display the display panel 12 in the backlight unit 15. A plurality of optical sheets 13 and 14, for example, a diffusion sheet 13 and a prism sheet 14, may be provided for diffusing or processing the light emitted toward the surface.

Meanwhile, the display unit 10 is fixed to the first back cover 16 that surrounds the rear of the backlight unit 15 and forms a rear shape of the display unit 10, and a lower side of the rear surface of the first back cover 16. The control module 20 may include the sub controllers 191, 192, and 193 that receive the supply power and the image signal to drive the display unit 10.

In this case, the control unit frame 18 provides a fixed position of the sub-control unit 191, 192, 193, and the sub-control unit 191, 192, 193 is fixed to the rear surface of the first back cover 16. It may be covered by the cover 17.

As described above, the display panel 12, the optical sheets 13 and 14, and the backlight unit 15 may be configured in the display module 1. In this case, the first back cover 16 may be fixed to the rear surface of the display module, and the front frame 11 may be formed to surround the front edge of the display module.

Accordingly, the front frame 11 may form a front appearance of the edge portion, that is, the bezel area, which is the non-display area of the display device 1, and the width of the front frame 11 may be the width of the bezel area. .

Meanwhile, the display panel 12 may include, for example, a lower substrate and an upper substrate bonded to each other to maintain a uniform cell gap facing each other, and a liquid crystal layer interposed between the two substrates. A plurality of gate lines and a plurality of data lines intersecting the plurality of gate lines may be formed on the lower substrate, and a thin film transistor (TFT) may be formed at an intersection of the gate line and the data line.

The backlight unit 15 provides a background light to the display panel 12 by using a light source that emits light, and uses a cold cathode fluorescent lamp (CCFL) or a plurality of light emission as the light source. It may include a light emitting diode (LED).

In this case, when the plurality of LEDs are used as the light source of the backlight unit 15, the light directing direction from which the light is emitted from the LED is directed toward the display panel 12 or the light directing is emitted from the LED. The backlight unit 15 may be provided in such a manner that a direction is formed in a direction parallel to the display panel 12 so that the light is refracted to direct the light path of the emitted light toward the display panel 12.

In the present embodiment, as an example, the light directing direction from which the light is emitted from the LED is emitted in a manner toward the display panel 12, wherein the backlight unit 15 is arranged in an array of a plurality of LEDs in a predetermined pattern And, it may be provided as a film type substrate having a certain size of elasticity.

Meanwhile, the sub controllers 191, 192, and 193 are components for controlling the image and the backlight unit 15 displayed on the display panel 12, and the image signal is inputted from the control module 20 to control the image signal. It may include a timing controller 191 for adjusting the amount of data and driving the display panel 12, and backlight unit drivers 192 and 193 for driving the backlight unit 15.

In this case, the sub controllers 191, 192, and 193 receive the image signal and are formed to have a minimum size for driving the display panel 12 and the backlight unit 15. 17) may be provided between.

Since the configuration of the display apparatus 1 as described with reference to FIGS. 1 and 2 is only one embodiment of the present invention, the present invention is not limited thereto.

FIG. 3 illustrates an embodiment of the configuration of the backlight unit, and illustrates the configuration of the backlight unit 15 illustrated in FIG. 2 in more detail.

Referring to FIG. 3, the backlight unit 15 may be configured by forming a plurality of light sources 200 on the first layer 151 positioned above the back cover 16.

The first layer 151 may be a substrate on which the plurality of light sources 200 are mounted, and an adapter (not shown) for supplying power and an electrode pattern (not shown) for connecting the light source 200 may be formed. Can be. For example, a carbon nanotube electrode pattern (not shown) for connecting the light source 200 and the adapter (not shown) may be formed on an upper surface of the substrate.

Meanwhile, the first layer 150 may be a printed circuit board (PCB) substrate on which a plurality of light sources 200 are mounted by using polyethylene terephthalate, glass, polycarbonate and silicon, and formed in a film form. Can be.

The light source 200 may emit light with a predetermined direction around the specific direction, and the specific direction may be a direction in which the light emitting surface of the light source 200 faces.

As an embodiment of the present invention, the light source 200 may be configured using a light emitting diode (LED), and may include a plurality of light emitting diodes (LEDs). For example, the light source 13 configured using the light emitting diode may emit light with a directivity angle of about 120 degrees with respect to the direction in which the light emitting surface is directed.

More specifically, the LED package constituting the light source 200 may be divided into a top view method and a side view method according to the direction in which the light emitting surface is directed, and the light source according to an embodiment of the present invention. The 200 may be configured using at least one of a top view LED package in which the light emitting surface is formed toward the upper side and a side view type LED package in which the light emitting surface is formed toward the side.

In addition, the light source 200 may be a colored LED or a white LED emitting at least one of colors such as red, blue, and green. In addition, the colored LED may include at least one of a red LED, a blue LED, and a green LED, and the arrangement and emission light of such a light emitting diode may be changed within the technical scope of the embodiment.

The backlight unit 15 as shown in FIG. 3 may be driven in a full driving manner or a partial driving scheme such as local dimming or impulsive. The driving method of the backlight unit 15 may be variously changed according to a circuit design, but is not limited thereto. As a result, the color contrast ratio is increased and the image of the bright and dark portions on the screen can be clearly expressed, thereby improving image quality.

That is, the backlight unit 15 is divided into a plurality of divided driving regions, and the luminance of the divided driving regions is linked with the luminance of the image signal so that the black portion of the image decreases the brightness and the bright portion increases the brightness. , Improve the contrast and sharpness.

For example, only some of the plurality of light sources 200 shown in FIG. 3 may be driven independently to emit light upwards, for which the light sources 200 included in the backlight unit 15 are each independent. Can be controlled.

Meanwhile, an area of the display panel 12 may be divided into two or more blocks, and the display panel 12 and the backlight unit 15 may be divided and driven in units of the blocks.

FIG. 4 is a sectional view showing an embodiment of the configuration of the backlight unit 15, and shows the "A" part shown in FIG. 3 in detail.

Referring to FIG. 4, the light source 200 is formed on the substrate 151 to emit light, for example, a LED package of a top view type, and a lens disposed above the light emitting element 201. 202 may include.

The light emitted from the light emitting element 201 is emitted at a predetermined direction in the image direction after passing through the lens 202.

In this case, in order to maintain the uniformity of the light emitted from the backlight unit 15, the optical thickness H of the backlight unit 15 should be 0.3 times or more the distance P between the light emitting elements 201. Due to constraints, it may be difficult to manufacture the backlight unit 15 in a thin thickness.

Meanwhile, the reflective plate 152 may be disposed on the substrate 151 as a layer for extracting or reflecting light emitted from the light source 200 toward the display panel 12.

A light extraction pattern may be formed on the upper surface of the reflector plate 152 to effectively extract the light emitted from the light source 200 toward the display panel 12.

The light extraction pattern is also referred to as a diffusion pattern because it has a function of diffusing light emitted from the light source 200 with uniform luminance to adjacent light sources.

In addition, a light blocking layer 250 having a light shielding pattern may be disposed on the light source 200, and the light blocking layer 250 may be formed of a metal sheet containing silver or aluminum.

In this case, light emitted from the light emitting device 201 and passing through the lens 202 is incident on the light shielding layer 250, and a part of the light incident on the light shielding layer 250 is transmitted to the display panel 12. do. The remaining light may be reflected after hitting the light blocking pattern.

That is, by forming a light shielding pattern that performs a light reflection function on the light shielding layer 250, hot spots may be prevented from being formed around the light source 200 and the luminance of the backlight unit 15 may be uniform.

In addition, a portion of the light emitted upward from the light source 200 may pass through the light blocking layer 250, thereby preventing the dark portion from being formed on the upper surface of the light source 200.

According to one embodiment of the present invention, by removing the lens 201 disposed on the upper side of the light emitting element 201, by forming an embossed pattern having a function similar to the lens on the reflecting plate 152, the backlight unit 15 It is possible to reduce the manufacturing cost and thickness of the same time.

Hereinafter, a configuration of the backlight unit 15 according to an embodiment of the present invention will be described in detail with reference to FIGS. 5 to 8.

5 is a perspective view showing the configuration of a reflecting plate according to an embodiment of the present invention.

Referring to FIG. 5, the reflective plate 152 may be formed by forming a plurality of embossed patterns 310 having a convex shape in an upward direction on the reflective sheet 300.

The plurality of embossed patterns 310 may be formed on the reflective plate 152 to correspond to the position and number of the light emitting devices 201 of the backlight unit 15.

That is, the structure of the reflector 152 illustrated in FIG. 5 may be the case in which the backlight unit 15 includes 24 light emitting devices 201 in three rows. However, the present invention is not limited thereto and may be applicable to the backlight unit 15 in which the light emitting devices 201 are arranged in various numbers and positions.

Referring to FIG. 6, the embossed pattern 310 has a dome shape around a position where the light emitting device 201 is formed, and a plurality of holes 311 are formed to allow light emitted from the light emitting device 201 to pass therethrough. There may be.

For example, the embossed pattern 310 may be formed by applying pressure to a specific position of the reflective sheet 300 to protrude in one direction, and the specific position to which the pressure is applied may be formed as described above. ) May correspond to the position where it is disposed.

In addition, the embossed pattern 310 formed as described above may be perforated in a circle to form a plurality of holes 310, and the position and size of the holes 310 formed in the embossed pattern 310 may correspond to a backlight unit ( It can be determined according to the optical properties required in 15).

For example, in order to reduce the occurrence of a hot spot in a portion corresponding to the position of the light emitting element 201, a hole is formed in the center portion corresponding to the position of the light emitting element 201 of the relief pattern 310 of the reflector plate 152. This may not be formed.

In addition, in order to improve the illuminance uniformity of the backlight unit 15 by emitting light emitted from the light emitting device 201 evenly to the periphery, the plurality of holes 311 may be formed to have different sizes.

For example, the size of each of the plurality of holes 311 may increase as the hole moves away from the center portion of the relief pattern 310.

That is, the size of the first hole 3111 closest to the center portion of the embossed pattern 310 is the smallest, and the second hole 3112 and the third hole 3113 are separated from the center portion of the embossed pattern 310. In order, the size of the hole may gradually increase.

Meanwhile, the fourth hole 3114 formed at the outermost portion of the embossed pattern 310 may be smaller than the third hole 3113 to reduce the influence between adjacent light emitting devices 201. .

FIG. 7 is a perspective view illustrating a configuration of a backlight unit according to an exemplary embodiment of the present invention. A description of the same configuration as that described with reference to FIGS. 1 to 6 of the configuration of the backlight unit 15 illustrated in FIG. It will be omitted below.

Referring to FIG. 7, the light emitting device 201 may be positioned in a space between the embossed pattern 310 formed on the reflective sheet 300 and the substrate 151, and the substrate 151 may be formed on the back cover 16. It may be disposed above.

On the other hand, the light emitting device 201 may be a LED package of the top view type that emits light in an upward direction with a predetermined direction angle, the LED package may not have a lens.

Referring to FIG. 8, a portion of the light emitted upward from the light emitting device 201 is emitted to the outside through the plurality of holes 311 formed in the embossed pattern 310 of the reflector plate 152 to form the optical sheets 13, After passing through 14, the display panel 12 may be provided.

On the other hand, a part of the light emitted from the light emitting device 201 incident on the portion where the hole 311 of the embossed pattern 310 is not formed is reflected from the rear surface of the embossed pattern 310 and faces downward, and the reflected light is reflected. Light may be reflected back from the substrate 151 in the upward direction.

The light reflected from the substrate 151 may be emitted to the outside through the plurality of holes 311 formed in the embossed pattern 310, or may be reflected downward from the rear surface of the embossed pattern 310.

As described above, the light emitted from the light emitting device 201 is directly emitted upward through the plurality of holes 311 formed in the embossed pattern 310, or between the back surface of the embossed pattern 310 and the substrate 151. It can be emitted after being reflected more than once.

Accordingly, the light emitted from the light emitting device 201 is emitted to the display panel 12 with the uniformity intended by the position, size, number, etc. of the plurality of holes 311 formed in the embossed pattern 310 and provided to the display panel 12. Can be.

Hereinafter, a configuration of a display apparatus according to an exemplary embodiment of the present invention will be described in detail with reference to FIGS. 9 to 11.

9 to 11, a substrate 151 may be disposed above the back cover 16, and a plurality of light emitting devices 201 may be mounted on the substrate 151. The backlight unit 15 may include a plurality of substrates 151 separated from each other.

The reflective plate 152 having the configuration as described with reference to FIGS. 5 to 8 may be disposed on the substrate 151, and the optical sheets 13 and 14 may be disposed above the reflective plate 152.

As shown in FIG. 11, the optical sheets 12 and 13 have a diffuser plate 131 for dispersing light emitted upward from the backlight unit 15 and a prism for collecting light dispersed by the diffuser plate 131. The sheet 141 and 142 and the prism sheets 141 and 142 may include a diffusion sheet 132 to diffuse the light collected again. In some cases, a protective sheet (not shown) may be placed on the top surface of the diffusion sheet 132 or instead of the diffusion sheet 132.

For example, a hot spot in which light emitted from the light sources 200 is partially concentrated by the diffusion plate 131 may not be generated. The diffusion plate 131 also plays a role of vertically raising the direction of the light traveling toward the prism sheets 141 and 142.

In addition, the prism sheets 141 and 142 may include a first prism sheet 141 having a transverse corrugation surface and a second prism sheet 142 having a longitudinal corrugation surface. The first prism sheet 141 collects light traveling toward the second prism sheet 142 in the front-rear direction, and the second prism sheet 142 collects light traveling toward the diffusion sheet 132 in the left-right direction. Therefore, the light propagating toward the diffusion sheet 132 from the diffusion plate 131 is raised so that it can proceed vertically.

Further, the light is uniformly distributed over the entire surface of the display panel 12 while passing through the diffusion sheet 131, resulting in not only uniform brightness but also improved brightness.

Meanwhile, the display panel 12 may be disposed above the optical sheets 13 and 14, and a panel guide 19 for supporting the display panel 12 may be provided at a side surface thereof.

The front frame 11 forms the front appearance of the edge portion, that is, the bezel region, which is the non-display area of the display device 1, and surrounds the side portions of the components as described above.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be understood that various modifications and applications other than those described above are possible. For example, each component specifically shown in the embodiments of the present invention can be modified and implemented. It is to be understood that all changes and modifications that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims (11)

Board;
A light emitting element formed on the substrate; And
A reflection plate disposed on an upper side of the substrate and having an embossed pattern having a convex shape in an upward direction;
The light emitting device is disposed in the space between the embossed pattern of the reflective plate and the substrate, the backlight unit is formed in the embossed pattern a plurality of holes through which the light emitted from the light emitting element passes. The method of claim 1, wherein the embossed pattern is
A backlight unit having a dome shape around a position where the light emitting element is formed. The method of claim 1,
And a plurality of holes formed in the embossed pattern at least two of which are different in size from each other. The method of claim 3,
The first unit of the plurality of holes is closer to the center portion of the embossed pattern than the second hole, the first hole is smaller in size than the second hole. 5. The method of claim 4,
The second hole of the plurality of holes is closer to the center portion of the embossed pattern than the third hole, the third hole is smaller in size than the second hole. The method of claim 1,
The backlight unit is not formed in the center portion of the embossed pattern. The method of claim 1, wherein the embossed pattern is
The backlight unit is formed on the reflector to correspond to the position and the number of light emitting elements provided in the backlight unit. The method of claim 1, wherein the light emitting device
Backlight unit that is an LED package without a lens. Backlight unit; And
A display panel disposed above the backlight unit;
The backlight unit
Board;
A light emitting element formed on the substrate; And
A reflection plate disposed on an upper side of the substrate and having an embossed pattern having a convex shape in an upward direction;
The light emitting device is disposed in the space between the embossed pattern of the reflective plate and the substrate, the display device is a plurality of holes through which the light emitted from the light emitting element passes through the embossed pattern. 10. The method of claim 9,
The plurality of holes formed in the embossed pattern at least two different sizes from each other. The method of claim 10, wherein at least some of the plurality of holes
The display device increases in size as it moves away from the center of the relief pattern.

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