KR20150064306A - Back light unit, display apparatus and lightint apparatus using the same - Google Patents

Abstract

The present invention provides a backlight unit for reducing the failure inspection time and the manufacturing time of the backlight unit, a display apparatus and a lighting apparatus using the same. The backlight unit includes a support case which includes a support plate which supports a light source module and a support sidewall which is combined with the outline of the support plate by being bent, a diffusion plate which is received on the support sidewall and outputs light to the outside by diffusing the light inputted from the light source module, a reflection sheet which is arranged on the support plate and reflects the light which is inputted, and at least one support unit which is arranged on the support plate, supports the diffusion plate, and closely attaches the reflection sheet to the support plate. The support unit includes a support bar which is arranged on the support plate, at least one post which protrudes from the upper side of the support bar and supports the diffusion plate, and a plurality of ribs which protrude from the side of the support bar in a lateral direction and closely attaches the reflection sheet to the support plate.

Description

BACK LIGHT UNIT, DISPLAY APPARATUS AND LIGHTING DEVICE USING THE SAME,

The present invention relates to a backlight unit, a display device using the backlight unit, and a lighting device.

When a voltage is applied to a specific molecular arrangement of a liquid crystal, the liquid crystal display device is converted into another molecular arrangement, and changes in optical properties such as birefringence, optical rotation, dichroism, and light scattering characteristics of the liquid crystal cell that emits light by such molecular arrangement, And is a display device that displays information using the modulation of light by the liquid crystal cell. Such a liquid crystal display device is provided with a backlight unit at a lower portion of the liquid crystal display panel and displays an image by the light emitted from the backlight unit.

The backlight unit can be divided into a side light type and a direct light type according to a method of arranging a light source module.

The light-metering backlight unit includes a light source module disposed on a side surface of a light guide plate provided below the liquid crystal display panel, and converts light emitted from the light source module into planar light through a light guide plate and irradiates the light onto the liquid crystal display panel. This is advantageous in that the thickness of the backlight unit can be reduced to make the liquid crystal display slim.

In the direct-type backlight unit, the light source module is disposed below the liquid crystal display panel and directly irradiates light to the entire surface of the liquid crystal display panel. This has the advantage of increasing the size of the liquid crystal display device because the uniformity and brightness of the light irradiated on the liquid crystal display panel is high.

1 is a sectional view for explaining a general direct type backlight unit.

1, a conventional backlight unit 1 includes a support case 10, a light source module 20, a diffusion plate 30, and a reflection sheet 40. [

The support case 10 includes a support plate 11 opposed to the diffusion plate 30 and a support side wall 12 inclined from the support plate 11 to be inclined. The support case 10 may be formed of a material having high durability and heat resistance.

The light source module 20 is disposed on the support plate 11 of the support case 10 and emits light to the diffusion plate 30. The light source module 20 includes a printed circuit board 21 mounted on the support plate 11 and a light emitting diode array 22 receiving power from the printed circuit board 21 to emit light.

The diffuser plate 30 diffuses light emitted from the light source module 20 and includes a plurality of beads (diffusion beads and haze beads) for diffusing light. A plurality of optical sheets for improving light characteristics and brightness may be disposed above the diffusion plate 30. [

The reflection sheet 40 is disposed on the support plate 11 and reflects the light reflected on the lower surface of the diffusion plate 30 back to the diffusion plate 30.

In order to improve the optical effect of the light emitted from the light source module 20, an optical gap between the light source module 20 and the diffusion plate 30 is required. The conventional backlight unit 1 further includes a support portion 50 for maintaining the optical space.

Fig. 2 is a view of assembling a support portion in a conventional backlight unit.

Referring to FIG. 2, the support part 50 prevents the diffusion plate 30 from being sagged or otherwise deformed. The support portion 50 is fixed to a through hole formed in the support plate 11. The supporting portion 50 is arranged on the upper surface of the support plate 11 in a rectangular arrangement. The larger the size of the diffusion plate 30, the greater the amount of the supporting portion 50 is provided. If the number of the support portions 50 is small, the diffusion plate 30 can not be supported flat, and the diffusion plate 30 may be bent. As a result, the air gap of the backlight unit 1 The height of the cavity is changed to lower the uniformity of light. Accordingly, in order to maintain the flatness of the diffusion plate 30 as much as possible, the number of the support portions 50 is very large in the conventional backlight unit 1.

As described above, in the conventional backlight unit 1, the assembling process is delayed by providing a large number of the supporting portions 50. As the number of the backlight unit 1 increases, the possibility of component removal increases. As a result, the conventional backlight unit 1 has a problem that the overall production time is prolonged and the production yield is lowered.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a backlight unit, a display device, and a lighting device using the backlight unit for shortening the manufacturing time and the defective inspection time of the entire backlight unit.

Other features and advantages of the invention will be set forth in the description which follows, or may be obvious to those skilled in the art from the description and the claims.

According to an aspect of the present invention, there is provided a backlight unit comprising: a support case having a support plate for supporting a light source module and a support side wall bent at an outer periphery of the support plate; A reflecting plate arranged on the supporting plate and reflecting the incident light, and a reflecting plate disposed on the supporting plate and supporting the reflecting plate while supporting the diffusing plate, Wherein the support comprises at least one support bar disposed on the support plate, at least one post projecting from the upper surface of the support bar and supporting the diffuser plate, and at least one support extending from the side of the support bar And the reflective sheet is projected sideways, To can comprise a plurality of ribs that contact.

According to an aspect of the present invention, there is provided a display device including the backlight unit according to any one of claims 1 to 7 and a display for displaying an image using light emitted from the backlight unit And a panel.

According to an aspect of the present invention, there is provided a lighting apparatus including the backlight unit according to any one of claims 1 to 7.

According to the solution of the above-mentioned problems, the present invention has the effect of improving the production yield of the backlight unit by shortening the manufacturing time and defective inspection time of the whole backlight unit.

1 is a sectional view for explaining a general direct type backlight unit.
Fig. 2 is a view of assembling a support portion in a conventional backlight unit.
3 is a perspective view for explaining a backlight unit according to the present invention.
4 is a perspective view illustrating a support according to an exemplary embodiment of the present invention.
5 is a cross-sectional view illustrating a backlight unit according to the present invention.
FIG. 6 is a front view of the support portion according to another example of the present invention, taken along the A side of FIG. 4;
7 is a perspective view illustrating a support according to another example of the present invention.
8 is a side view for explaining a support according to the present invention.
9 is a plan view for explaining a backlight unit according to the present invention.
10 is a cross-sectional view illustrating a display device according to an exemplary embodiment of the present invention.

It should be noted that, in the specification of the present invention, the same reference numerals as in the drawings denote the same elements, but they are numbered as much as possible even if they are shown in different drawings.

Meanwhile, the meaning of the terms described in the present specification should be understood as follows.

The word " first, "" second," and the like, used to distinguish one element from another, are to be understood to include plural representations unless the context clearly dictates otherwise. The scope of the right should not be limited by these terms.

It should be understood that the terms "comprises" or "having" does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

It should be understood that the term "at least one" includes all possible combinations from one or more related items. For example, the meaning of "at least one of the first item, the second item and the third item" means not only the first item, the second item or the third item, but also the second item and the second item among the first item, Means any combination of items that can be presented from more than one.

The term "on" means not only when a configuration is formed directly on top of another configuration, but also when a third configuration is interposed between these configurations.

Hereinafter, preferred embodiments of a backlight unit, a display device and a lighting device using the same according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 3 is a perspective view for explaining a backlight unit according to the present invention, FIG. 4 is a perspective view for explaining a support unit according to an exemplary embodiment of the present invention, and FIG. 5 is a sectional view for explaining a backlight unit according to the present invention to be.

3 to 5, the backlight unit 100 according to the present invention includes a support case 110, a light source module 120, a diffusion plate 130, a reflection sheet 140, and a support 150 .

The support case 110 houses the light source module 120, the diffusion plate 130, the reflection sheet 140, and the support unit 150. The support case 110 includes a support plate 111 and a support side wall 112. The support plate 111 is formed in a plate shape to support the light source module 120. The support sidewall 112 is coupled to the outer periphery of the support plate 111 so as to be bent and surrounds the outer periphery of the support plate 111. The support side wall 112 is formed to be inclined with respect to the support plate 111. The support case 110 may be formed of a material having high durability and heat resistance.

The light source module 120 is disposed on the support plate 111 and emits light to the diffusion plate 130. The light source module 120 includes a printed circuit board 121 and a light emitting diode array 122.

The printed circuit board 121 is disposed on the bottom surface of the support plate 111. The printed circuit board 121 includes a driving power supply line to which driving power is supplied from the outside, and supplies power from the outside via the driving power supply line to the LED array 122.

The light emitting diode array 122 includes a plurality of light emitting diode packages coupled on a substrate, the light emitting diode package including a light emitting diode chip for generating light by a power source, and a light emitting diode chip for emitting light emitted from the light emitting diode chip to the outside And a lens 123 for diffusing light.

The reflection sheet 140 is disposed opposite to the support plate 111 to reflect incident light. The light emitted from the light source module 120 is transmitted through the diffusion plate 130 or reflected by the lower surface of the diffusion plate 130 and the reflected light reaches the reflective sheet 140. The light incident on the reflective sheet 140 is reflected again and proceeds to the diffusion plate 130. For this, the reflective sheet 140 may be formed in the form of a sheet to cover the entire upper surface of the support plate 111, and may be formed of a material having high reflectance. The reflective sheet 140 may be disposed on the upper surface of the support plate 111 and extend to cover the upper surface of the support side wall 112. Accordingly, the reflective sheet 140 can reflect light traveling to the support sidewall 112.

The diffusion plate 130 is mounted on the support sidewall 112 to diffuse light emitted from the light source module 120 and emit the light to the outside. The diffuser plate 130 may include a plurality of beads (diffusion beads and haze beads) for the diffusion of light. The diffuser plate 130 is positioned opposite to the support plate 111, the light source module 120 and the reflective sheet 140, and is disposed in parallel with the light source module 120 so as to have a constant distance from the light source module 120 . This keeps the optical gap between the light source module 120 and the diffusion plate 130 constant to maintain the uniformity of light of the backlight unit 100.

A plurality of optical sheets 131 may be disposed on the upper surface of the diffuser plate 130 to improve the characteristics and brightness of light passing through the diffuser plate 130. The plurality of optical sheets 131 may be a sheet such as a prism shape, a lenticular lens shape, a microlens shape, or the like. The optical sheet 131 may include a material such as a bead or the like to improve the optical effect.

The support part 150 is disposed on the support plate 111 to keep the space constant. The support part 150 supports the diffusion plate 130 and closely adheres the reflection sheet 140 to the support plate 111. The backlight unit 100 according to the present invention includes at least one support 150. [

The support portion 150 includes a support bar 151, a post 152, and a rib 153.

The support bar 151 is formed to have a length extending in one direction and is disposed on the support plate 111. The supporting bar 151 may be formed in a flat bottom surface opposed to the supporting plate 111 so as to be stably supported on the supporting plate 111. Since the printed circuit board 121 is mounted on the support plate 111, the support 150 may be supported on the printed circuit board 121.

The post 152 supports the diffusion plate 130 and protrudes from the upper surface of the support bar 151. The post 152 may have a length extending from the upper surface of the support bar to the lower surface of the diffusion plate 130. The upper surface of the post 152 may contact the diffusion plate 130 to support the diffusion plate 130 have. These posts 152 may be vertically coupled to the top surface of the support bar. The support 150 includes at least one post 152 and each of the plurality of posts 152 may be spaced apart from one another to support the diffuser plate 130 in a larger area. Here, the support bar 151 may function to couple the plurality of posts 152 to each other. Specifically, the posts 152 may be disposed on the upper surface of the support bar 151 at regular intervals.

The support bar 151 has a predetermined length and a plurality of the posts 152 are formed so that the diffusion plate 130 is supported by the backlight unit 100 even if the support unit 150 is provided in the backlight unit 100 in a small number. And the assembling time of the supporting portion 150 can be reduced. In addition, the present invention can also reduce the inspection time for inspecting a small amount of the support portion 150.

A friction member (not shown) may be coupled to one surface of the post 152 in contact with the diffusion plate 130 such that the post 152 does not slip into the diffusion plate 130. For example, the friction member may be formed of a rubber material, but may be formed of another material having a high coefficient of friction.

The rib 153 is formed to closely project the reflective sheet 140 to the support plate 111 and to project sideways from the side surface of the support bar 151. The rib 153 is opposed to the support plate 111 and is positioned above the reflective sheet 140. Accordingly, the rib 153 can function to keep the reflective sheet 140 flat without wrinkling.

The bottom surface of the rib 153 facing the reflective sheet 140 may be planar so that the area of contact with the reflective sheet 140 is increased to wrinkle the reflective sheet 140, Can be further prevented.

The supporting portion 150 includes at least one rib 153 and each of the plurality of ribs 153 is spaced apart from each other so that the reflective sheet 140 can be brought into close contact with a larger area. Specifically, the plurality of ribs 153 may be coupled to one side of the support bar 151 at equal intervals, and may be coupled to the other side of the support bar 151 to correspond to the one side. That is, the ribs 153 may be connected to the left and right sides of the support bar 151 and connected to each other in a straight line. Alternatively, although not shown, the plurality of ribs 153 may be arranged so that the object coupled to one side of the support bar 151 and the object coupled to the other side of the support bar 151 are not connected in a straight line but are shifted from each other.

In addition, the support part 150 may include the rib 153 to exhibit a stability effect that can be supported by the support plate 111 in a wider area in addition to the support bar 151.

FIG. 6 is a front view of the support portion according to another example of the present invention, taken along the A side of FIG. 4;

Referring to FIG. 6, each of the plurality of ribs 153 according to one embodiment may be formed to be inclined from the support bar 151 toward the support plate 111. That is, each of the plurality of ribs 153 is formed such that one end thereof is coupled to the support bar 151 and the other end thereof is positioned at a height lower than the height of the support bar 151. Each of the plurality of ribs 153 may be formed at a predetermined angle from the lower side of the support bar 151. Specifically, the angle may be less than 180 degrees. The other end of each of the ribs 153 is connected to the diffusion plate 130 by the support plate 111 as the post 152 is pressed toward the support plate 111 by the diffusion plate 130. [ So as to be positioned adjacent to the height of the support bar 151. The inclined structure of the rib 153 causes the diffusion plate 130 to be seated on the post 152 and to generate a pressing force for pressing the reflective sheet 140 toward the support plate 111 by itself. The pressing force by the inclined structure of the rib 153 may be affected by the elasticity depending on the material characteristic of the rib 153.

7 is a perspective view illustrating a support according to another example of the present invention.

Referring to FIG. 7, each of the plurality of ribs 153 according to another embodiment may have one end coupled to the support bar 151 and the other end thereof coupled to the post 152. Then, as the posts 152 are pressed toward the support plate 111 by the diffusion plate 130, the other ends of the ribs 153 press the support plate 111.

The supporting part 150 may further include a protrusion 154 protruding from the lower surface of the supporting bar 151. In this case, the support case 110 further includes an insertion portion 113 formed in the support plate 111.

The insertion portion 113 may be formed in a groove shape to dent the upper surface of the support plate 111 or may be formed in a hole shape such that the support plate 111 passes through. The printed circuit board 121 is mounted on the supporting plate 111 so that the inserting unit 113 can be integrally formed on both the printed circuit board 121 and the supporting plate 111. At this time, if the inserting portion 113 is formed in a groove shape, the inserting portion 113 may be formed on only one of the printed circuit board 121 and the supporting plate 111.

The protrusion 154 is inserted into the insertion portion 113 and functions to guide a position where the support portion 150 is disposed. That is, the protrusion 154 is positioned in correspondence with the position of the insertion portion 113 formed on the support plate 111. The support portion 150 is constrained by inserting the protrusion 154 into the insertion portion 113. [

In addition, if the protrusion 154 is formed to have the same size as the insertion portion 113 and is fitted to the insertion portion 113 in an interference fit manner, The protrusions 154 may be formed to have a size smaller than that of the inserting portion 113 in order to prevent a problem that the inserting portion 110 may be broken.

The insertion portion 113 may be formed on the support plate 111 in plurality and the protrusions 154 may be formed on the support bar 151 in plurality. At this time, the insertion portions 113 and the protrusions 154 are formed in the same number.

The supporting unit 150 may further include an adhesive member 155.

The adhesive member 155 is disposed on the lower surface of the support bar 151 to adhere the support bar 151 to the support plate 111. Accordingly, the support portion 150 is more stably fixed (or attached) to the support plate 111 by the adhesive member 155, and thus the inspection time for the engagement of the support portion 150 is reduced May be omitted.

A through hole 141 is formed in the reflective sheet 140 in a manner corresponding to the adhesive member 155 so that the adhesive member 155 adheres the support plate 111 and the support bar 151 . The through-hole 141 is formed at the position of the support bar 151 so that the support bar 151 passes through the through-hole 141 and is adhered to the support plate 111.

The adhesive member 155 may be attached to, adhered to, or applied to the lower surface of the support bar 151. The adhesive member 155 may be made of a double-sided tape, a natural curable adhesive, a thermosetting adhesive, or a photo-curable adhesive. The adhesive member 155 may be formed on the outer surface of the protrusion 154.

The support portion 150 may further include a rigid reinforcing rib 156.

The rigid reinforcing ribs 156 are formed to vertically protrude from the upper surface of the support bar 151. The rigid reinforcing ribs 156 are reinforcing structures for enhancing the strength, The rigid reinforcing rib 156 may be formed on the upper portion of the lead, and other structures such as an I-type girder structure may be used as long as the strength, the supporting force and the stability of the supporting portion 150 can be increased.

The support 150 may be formed of a hardened resin or may be formed of a flexible material such as silicone resin so as not to damage the diffusion plate 130.

8 is a side view for explaining a support according to the present invention.

Referring to FIG. 8, the supporting unit 150 may further include a reflecting member 157 attached to the upper surface. The reflective member 157 may reflect the light that is emitted from the light source module 120 or the diffusion plate 130 to compensate the reflectance of the portion of the reflective sheet 140 that is covered by the support 150 . The reflecting member 157 may be separately provided and may be attached, adhered, coated, or coupled to the upper surface of the supporting unit 150, or may be integrally formed with the supporting unit 150.

9 is a plan view for explaining a backlight unit according to the present invention.

Referring to FIG. 9, the support portions 150 may be disposed on the support plate 111 so as to be spaced apart from one another. In this case, each of the adjacent supports 150 is staggered from each other. Specifically, for example, the support portions 150 may be arranged such that the lines connecting the ends of each of the support bars 151 appear in a zigzag shape while the respective support bars 151 are arranged parallel to each other have. The support portions 150 may be arranged so that the ribs 153 intersect along the longitudinal axis of the support bar 151 so that the distance between the adjacent ribs 153 is narrowed And can be arranged in a more dense mesh on the reflective sheet 140. Accordingly, the support portion 150 can more closely adhere the reflection sheet 140.

The backlight unit 100 according to the present invention can be used as a component of another apparatus.

10 is a cross-sectional view illustrating a display device according to an exemplary embodiment of the present invention.

Referring to FIG. 10, the display device 200 according to an exemplary embodiment of the present invention may include the backlight unit 100 and the display panel 210 described above.

The display panel 210 may be a liquid crystal display panel that displays an image using light emitted from the backlight unit 100. The display panel 210 may include a transistor array substrate and a color filter array substrate which are opposed to each other with a liquid crystal cell interposed therebetween, and optical films disposed on the color filter array substrate and under the transistor array substrate, respectively .

The display device 200 according to an exemplary embodiment of the present invention includes a guide panel 220 interposed between the backlight unit 100 and the display panel 210 and an upper cover 220 coupled to the upper surface of the display panel 210. [ (230).

Although not shown, a lighting apparatus according to another example of the present invention may be configured to include the backlight unit 100 described above.

The illumination device may be configured to include a transparent glass or plastic substrate (not shown) so as to be disposed on the upper part of the backlight unit 100, and the illumination device may be formed on the transparent substrate by light emitted from the backlight unit 100 It is possible to emit an object to be placed. As an example, a lighting device may be used for advertising to illuminate a large poster.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Will be clear to those who have knowledge of. Therefore, the scope of the present invention is defined by the appended claims, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be interpreted as being included in the scope of the present invention.

100: backlight unit 110: support case
111: support plate 112: support side wall
120: light source module 121: printed circuit board
122: light emitting diode array 123: lens
130: diffusion plate 140: reflective sheet
141: Through hole 150: Support
151: support bar 152: post
153: rib 154: projection
155: Adhesive member 156: Rigidity reinforcing rib
157: reflective member 200: display device
210: display panel 220: guide panel
230: upper cover

Claims (9)

A support case including a support plate for supporting the light source module and a support side wall bent in an outer side of the support plate;
A diffusion plate that is seated on the support sidewall and diffuses the light incident from the light source module to emit the light to the outside;
A reflective sheet disposed on the support plate and reflecting the incident light; And
And at least one support portion disposed on the support plate and supporting the diffusion plate while closely contacting the reflection sheet to the support plate,
The support portion
A support bar disposed on the support plate;
At least one post projecting from an upper surface of the support bar to support the diffuser plate; And
And a plurality of ribs projecting sideways from the side surface of the support bar to closely contact the reflection sheet to the support plate. The method according to claim 1,
Wherein the support case further includes a plurality of insertion portions formed in the support plate,
Wherein the support portion further comprises a plurality of protrusions protruding from a lower surface of the support bar and inserted into each of the plurality of insertion portions. The method according to claim 1,
Wherein each of the plurality of ribs is inclined from the support bar toward the support plate. 3. The method of claim 2,
The support portion
And an adhesive member disposed on a lower surface of the support bar. 5. The method of claim 4,
Wherein the adhesive member is one of a double-sided tape, a natural curable adhesive, a thermosetting adhesive, and a photo-curable adhesive. 5. The method of claim 4,
Wherein the support portions are disposed on the support plate so as to be spaced apart from each other,
And each of the adjacent supports is staggered from each other. 5. The method of claim 4,
The support portion
And a rigid reinforcing rib vertically protruding from the upper surface of the support bar. A backlight unit according to any one of claims 1 to 7; And
And a display panel for displaying an image using light emitted from the backlight unit. A lighting device comprising the backlight unit according to any one of claims 1 to 7.

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