KR20170014467A - Diffusion plate and liquid crystal display device including the same - Google Patents

Abstract

The present invention provides a diffusion plate implemented with a large size and a liquid crystal display device including the same. The diffusion plate according to the present invention includes a first diffusion plate and a second diffusion plate whose lateral sides facing each other are bonded to each other, a first pattern part which is formed on the first diffusion plate, and a second pattern part which is formed on the second diffusion plate. Accordingly, a light path passing through a plurality of diffusion plates is changed so that lines generated in a bonding part between the first diffusion plate and the second diffusion plate are not recognized.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display (LCD)

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display, and more particularly, to a diffusing plate applicable to a large model.

As portable electronic devices such as mobile communication terminals and notebook computers are developed, there is an increasing demand for flat panel display devices applicable thereto.

Examples of the flat panel display include a liquid crystal display device, a plasma display panel, a field emission display device, a light emitting diode display device, an organic light emitting diode (Organic Light Emitting Diode Display Device) have been studied.

Among such flat panel display devices, liquid crystal display devices are being applied to the fields of development of mass production technology, ease of driving means, low power consumption, realization of high image quality and realization of a large screen.

Since such a liquid crystal display device is an element which does not have a self-luminous element, a separate light source is required. Accordingly, a backlight unit having a light source such as an LED is provided on the back surface, and light is irradiated toward the front surface of the liquid crystal panel, thereby realizing an image that can be discriminated.

In this case, a general backlight unit is divided into a direct type and an edge type. The direct-type backlight unit has a structure in which a plurality of light sources are disposed under the liquid crystal panel, and the edge-type backlight unit has a structure in which a light source is disposed so as to face the side face of the light guide plate and a plurality of optical sheets are disposed between the liquid crystal panel and the light guide plate I have.

In particular, in the case of a liquid crystal display device including a direct-type backlight unit, a structure is such that a plurality of optical sheets and a diffusion plate are stacked under a liquid crystal panel, and a plurality of light sources are disposed under a diffusion plate. The light emitted from the light source is scattered and refracted through the diffusion plate and the optical sheets to spread to the front surface of the liquid crystal panel to display an image through the liquid crystal panel.

In recent years, as the display industry has developed, there has been an increasing demand for larger display screens. In order to satisfy such a demand, the liquid crystal panels, optical sheets, and diffusion plates of the above-described liquid crystal display devices must be enlarged.

At this time, there has been a limit in increasing the size of the diffusion plate when using the existing manufacturing equipment, so there has been an attempt to provide a new manufacturing facility for manufacturing a large-sized diffusion plate. However, since there is a limit of more than a few billion won in preparation of a new manufacturing facility, there is a demand for a method of obtaining a large diffusion plate from existing manufacturing facilities.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a diffusion plate which can be realized in a large size and a liquid crystal display device including the same.

According to an aspect of the present invention, there is provided a liquid crystal display device including a first diffusion plate and a second diffusion plate, a first pattern unit provided on the first diffusion plate, and a second pattern unit provided on the second diffusion plate, Wherein a plurality of diffusing plates are bonded to increase the size of the diffusing plate and the optical path passing through the plurality of diffusing plates is changed through the first patterning portion and the second patterning portion, And the second diffuser plate.

According to the present invention as described above, the following effects can be obtained.

According to the present invention, it is possible to increase the size of the diffuser plate by constructing the diffuser plate by adhering a plurality of diffuser plates by a physical or chemical method.

Further, according to the present invention, a more complicated optical path is formed through the pattern portion on the upper surface of the bonding diffusion plate to which the plurality of diffusion plates are bonded, so that the band shape on the bonding portion of the bonding diffusion plate is not recognized.

Further, according to the present invention, there is no need to newly manufacture a manufacturing facility for application to a large model, so that the production cost is not increased.

1 is a view showing a bonded diffusion plate formed by bonding a plurality of diffusion plates according to a first embodiment of the present invention.
2 is a view showing the path of light proceeding from the surface of the junction diffusion plate.
FIGS. 3A and 3B are views showing images displayed through a single diffusion plate and images displayed through a diffusion plate bonded with a plurality of diffusion plates. FIG.
4 is a view illustrating a diffuser plate and a backlight unit including the same according to a second embodiment of the present invention.
5 is a cross-sectional view of a diffusion plate and a liquid crystal display device including the same according to a second embodiment of the present invention.
6 is a plan view showing a diffusion plate according to a second embodiment of the present invention.
7 is a view showing the path of light viewed from the front of the diffuser plate according to the second embodiment of the present invention.
FIGS. 8A and 8B are views comparing images displayed through the diffuser plate when the pattern units included in the diffuser plate are arranged at an arbitrary interval and when the pattern units are arranged at regular intervals. FIG.
FIG. 9 is an enlarged view showing the "A" region of FIG. 6 in an enlarged manner.
FIGS. 10A and 10B are views comparing images displayed through a diffuser plate when the pattern unit included in the diffuser plate meets or does not satisfy the width condition according to the present invention.
FIGS. 11A and 11B are views comparing images displayed through a diffuser plate when the pattern unit included in the diffuser plate satisfies the depth condition according to the present invention and is not satisfied.
FIGS. 12A and 12B are diagrams comparing images displayed through a diffuser plate when the pattern unit included in the diffuser plate satisfies the length condition according to the present invention and is not satisfied.
13 is an exploded perspective view of a liquid crystal display device including a diffusing plate according to a second embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims.

The shapes, sizes, ratios, angles, numbers, and the like disclosed in the drawings for describing the embodiments of the present invention are illustrative, and thus the present invention is not limited thereto. Like reference numerals refer to like elements throughout the specification. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. In the case where the word 'includes', 'having', 'done', etc. are used in this specification, other parts can be added unless '~ only' is used. Unless the context clearly dictates otherwise, including the plural unless the context clearly dictates otherwise.

In interpreting the constituent elements, it is construed to include the error range even if there is no separate description.

In the case of a description of the positional relationship, for example, if the positional relationship between two parts is described as 'on', 'on top', 'under', and 'next to' Or " direct " is not used, one or more other portions may be located between the two portions.

In the case of a description of a temporal relationship, for example, if the temporal relationship is described by 'after', 'after', 'after', 'before', etc., May not be continuous unless they are not used.

The first, second, etc. are used to describe various components, but these components are not limited by these terms. These terms are used only to distinguish one component from another. Therefore, the first component mentioned below may be the second component within the technical spirit of the present invention.

It is to be understood that each of the features of the various embodiments of the present invention may be combined or combined with each other, partially or wholly, technically various interlocking and driving, and that the embodiments may be practiced independently of each other, It is possible.

1 is a view showing a bonded diffusion plate formed by bonding a plurality of diffusion plates according to a first embodiment of the present invention.

As shown in FIG. 1, in the first embodiment of the present invention, a plurality of diffusion plates 42 and 44 can be joined to form a large-sized diffusion plate 40 without having to provide a new manufacturing facility.

Specifically, the diffusion plate 40 is provided with opposing side surfaces of the plurality of diffusion plates 42 and 44 bonded to each other. The bonding method is a bonding method in which a plurality of diffusion plates 42 and 44, such as physical or chemical methods, Any way you can use it.

As described above, in the first embodiment of the present invention, it is possible to form a large-sized diffusion plate 40 that can be applied to a large-sized liquid crystal display device by bonding a plurality of diffusion plates 42 and 44.

2 is a view showing the path of light proceeding from the surface of the junction diffusion plate.

1 and 2, when a plurality of diffusion plates 42 and 44 are joined to form a large-sized diffusion plate 40, there is a gap between the diffusion plates 42 and 44, Since the bonding region S and the non-bonding region have different characteristics of the medium, the paths of the light traveling on the surface of the diffusion plate are different from each other.

Specifically, as shown in FIG. 2, a path of light is formed in the form of L2 through a junction S between a plurality of diffusion plates 42 and 44, and a light path such as L1 through a non- And the path of light traveling through the non-junction region is different from that of the junction region S, as shown in FIG.

In other words, the light transmittance at the front surface of the diffusion plate 40 may not be uniform due to the difference in the optical path between the junction S and the non-junction. Then, a band shape corresponding to the joint portion S can be recognized in an image displayed through the bonded diffusion plate 40.

FIGS. 3A and 3B are images obtained by passing through a single diffuser plate and comparing a displayed image with a displayed image through a diffusion plate bonded with a plurality of diffuser plates. FIG.

FIG. 3A shows an image displayed through a single diffuser plate, and FIG. 3B shows an image displayed through a diffuser plate.

3A, since the light passing through the single diffuser plate travels in the same path at the front surface of the diffuser plate, the light transmittance at the entire surface of the liquid crystal panel is constant, and no specific pattern appears on the displayed image. As the light passing through the bonding diffusion plate 40 travels in different paths on the surface of the bonding site S and the non-bonding site, the light transmittance on the entire surface of the liquid crystal panel may not be constant. It can be seen that a band corresponding to the shape of the junction appears on the image displayed through the diffusion plate 40 thus bonded.

As described above, in the case of the liquid crystal display device including the diffusion plate 40 according to the first embodiment of the present invention, the light transmittance at the junction S between the diffusion plates 40 is different from the light transmittance at the non- So that a band shape corresponding to the joint portion S could appear in the display image.

4 is a view illustrating a diffuser plate and a backlight unit including the same according to a second embodiment of the present invention.

Referring to FIG. 4, the backlight unit according to the second embodiment of the present invention includes a light source 10, a reflection unit 20, a diffusion plate 40, and an optical sheet 30.

The light source 10 generates light according to driving of each of a plurality of lamps disposed at a predetermined interval on the lower surface of the diffusion plate 40, and irradiates the diffusion plate 40 with light.

The reflector 20 is disposed on the lower surface of the light source 10 and reflects the light incident from the light source 10 toward the diffusion plate 40 to minimize the loss of light.

The diffusion plate 40 is disposed on the light source 10 to diffuse the light emitted from the light source 10 and irradiate the light onto the optical sheet 30.

4, the optical sheet 30 according to the second embodiment of the present invention includes a lower diffusion sheet 31, a prism sheet 32, and an upper diffusion sheet 33. [

The lower diffusion sheet 31 is disposed on the diffusion plate 40 to diffuse the light emitted from the diffusion plate 40 into the entire area and irradiate the diffusion sheet 40 to the prism sheet 32.

The prism sheet 32 is disposed on the lower diffusion sheet 31. The prism sheet 32 condenses the light emitted from the lower diffusion sheet 31 in a first direction (e.g., the X-axis direction) and irradiates the upper diffusion sheet 33 with the light.

To this end, the prism sheet 32 has a plurality of prism mountains 32a formed in parallel so as to have a predetermined interval along the first direction.

The upper diffusion sheet 33 is disposed on the prism sheet 32 and diffuses light radiated from the prism sheet 32 into the entire area to irradiate the liquid crystal panel.

5 is a cross-sectional view of a diffusion plate and a liquid crystal display device including the same according to a second embodiment of the present invention.

The liquid crystal display device of Fig. 5 similarly includes a backlight unit including the diffusion plate 40 of Fig. 4 described above. Therefore, the same reference numerals are assigned to the same components.

5, a liquid crystal display device according to the present invention includes a light source 10, a reflective portion 20, a diffusion plate 40, an optical sheet 30, a liquid crystal panel 60, a bottom cover 70 ), A guide panel (80), and a case top (90).

The light source 10 generates light according to driving of each of a plurality of lamps disposed at a predetermined interval on the lower surface of the diffusion plate 40, and irradiates the diffusion plate 40 with light.

The reflector 20 is disposed on the lower surface of the light source 10 and reflects the light incident from the light source 10 toward the diffusion plate 40 to minimize the loss of light.

The diffusion plate 40 is disposed on the light source 10 to diffuse the light emitted from the light source 10 and irradiate the light onto the optical sheet 30.

The optical sheet 30 is disposed on the diffusion plate 40 and changes the optical characteristics of light emitted from the diffusion plate 40 to irradiate the liquid crystal panel 60.

4, the optical sheet 30 includes the lower diffusion sheet 31, the prism sheet 32, and the upper diffusion sheet 33, but the present invention is not limited to this, And the order of stacking the sheets can also be changed in various ways.

The liquid crystal panel 60 includes a lower substrate 60a and an upper substrate 60b and is disposed on the optical sheet 30 to display an image using light emitted from the optical sheet 30. [

The bottom cover 70 is provided to receive the light source 10 and the reflection unit 20 and supports the diffusion plate 40 and the optical sheet 30.

The guide panel 700 is arranged to support the liquid crystal panel 60 on the side of the bottom cover 70 and the case top 800 covers the top and sides of the liquid crystal panel 60 So that an image formed on the liquid crystal panel 60 can be displayed through the opening.

6 is a plan view showing a diffusion plate according to a second embodiment of the present invention.

7 is a view showing the path of light viewed from the front of the diffuser plate according to the second embodiment of the present invention.

6, the diffuser plate 40 includes a first diffuser plate 42 and a second diffuser plate 42. The diffuser plate 40 differs from the first diffuser plate 42 and the second diffuser plate 40, (44).

In particular, the first diffusion plate 42 and the second diffusion plate 44 according to the embodiment of the present invention may have the same structure and the same size for convenience of design, but the present invention is not limited thereto But may be provided in different structures or sizes.

The first diffusion plate 42 and the second diffusion plate 44 are in the form of a quadrilateral plate and are disposed on the light source 10 to diffuse the light emitted from the light source 10, .

At this time, the first diffusion plate 42 and the second diffusion plate 44 may be formed of a material such as polycarbonate (PC), polymethyl methacrylate (PMMA), polyethylene terephthalate ; PET), and a material of polymethyl methacrylate having excellent rigidity is mainly used.

7, the first diffusion plate 42 includes a support layer 42b and a diffuser 42a provided on the support layer 42b for diffusing light emitted from the light source 10, The second diffusion plate 44 includes a support layer 44b and a diffuser 44a provided on the support layer 44b to diffuse the light emitted from the light source 10. [

The diffusing agents 42a and 44b are fine particles having a spherical shape and are made of an inorganic material such as glass, talc, aluminum oxide or titanium dioxide or an organic material such as polystyrene, polycarbonate or polymethylmethacrylate . At this time, the fine particles such as talc, aluminum oxide, and titanium dioxide have a function of diffusing light by reflecting on the surface without transmitting light, and fine particles such as glass, polystyrene, polycarbonate, polymethyl methacrylate, Or diffract light to change the light path and diffuse it.

Since the diffusers 42a and 44a can diffuse light in various ways according to the constituent materials, the diffusers 42a and 44a can be provided at various positions such as inside or below the support layers 42b and 44b.

Specifically, when the diffusing agent 42a or 44a is provided in the support layer 42b or 44b, the diffusing agent 42a or 44a does not transmit light irradiated to the support layer 42b or 44b, And diffuses the light toward the liquid crystal panel 60 by reflecting the light. When the diffusing agents 42a and 44a are provided on the bottom surfaces of the supporting layers 42b and 44b, the diffusing agents 42a and 44a transmit the light irradiated to the supporting layers 42b and 44b, To diffuse light toward the liquid crystal panel (60).

Particularly, in the diffusion plate 40 according to the present invention, when the first diffusion plate 42 and the second diffusion plate 44 are bonded by the physical or chemical bonding method, the first diffusion plate 42 and the second diffusion plate 44 A first pattern portion 50a provided in the first diffusion plate 42 to change the light path so as not to recognize the shape of the band at the junction S of the diffusion plate 44, And a second pattern portion 50b provided in the second pattern portion 44 to change the light path.

That is, when the first diffusion plate 42 and the second diffusion plate 44 are bonded to each other, a light path difference occurs on the upper surface of the bonding site S and the non-bonding site, Since the light transmittance on the non-bonding portion is different, a band shape may appear in the image corresponding to the bonding portion S.

Therefore, in the second embodiment of the present invention, the first pattern portion 50a and the second pattern portion 50b are additionally formed on the surface of the diffusion plate 40 and the diffusion agent 42a, 44a By changing the diffused light path again on the upper surface of the diffusion plate 40, the shape of the strip can not be recognized.

That is, since the path of light is different only in the junction region S, the light transmittance differs between the junction region S and the non-junction region, and thus a band shape occurs. Therefore, in the present invention, the first pattern portion 50a and the second And forms a path of various light including a light path similar to the light path on the junction through the pattern unit 50b, thereby preventing recognition of the strip shape.

Particularly, the first pattern part 50a and the second pattern part 50b according to the second embodiment of the present invention are provided on the upper surfaces of the first polarizing plate 42 and the second polarizing plate 44, respectively.

That is, the second embodiment of the present invention differs through the diffuser 42a and 44a and changes the path of the final light passing through the diffuser plate 40, The first pattern portion 50a and the second pattern portion 50b are provided on the upper surfaces of the first polarizing plate 42 and the second polarizing plate 44, respectively.

The first pattern portion 50a and the second pattern portion 50b according to the second embodiment of the present invention can be formed of any material that can change the light path and must be included as an additional material And the surface of the supporting layers 42b and 44b of the diffusion plate 40 may be scratched.

Hereinafter, the characteristics of the diffusion plate according to the second embodiment of the present invention will be described in more detail.

6 and 7, in the second embodiment of the present invention, the first diffusing plate 42 and the second diffusing plate 44 are provided with first pattern portions 50a and second And further includes a pattern portion 50b.

When the first pattern portion 50a and the second pattern portion 50b are convexly formed on the surfaces of the support layers 42b and 44b, the optical sheet 30 May be spaced apart from the diffusion plate 40 by the first pattern portion 50a and the second pattern portion 50b having a convex shape, so that the thickness of the liquid crystal display device may be increased.

Therefore, in the second embodiment of the present invention, the first pattern portion 50a and the second pattern portion 50b are concave with respect to the upper surface of the first diffusion plate 42 and the second diffusion plate 44, respectively Respectively.

6, the first pattern portion 50a and the second pattern portion 50b according to the second embodiment of the present invention may include the first diffusion plate 42 and the second diffusion plate 44, A path of light similar to the path of the light at the junction S between the first diffusion plate 42 and the second diffusion plate 44 can be formed on the non-junction portion as well.

In other words, according to the present invention, a light path similar to the light path at the junction S is also formed on the non-junction, so that it is impossible to recognize the band shape that is generated due to the difference in light transmittance only at the junction.

At least one of the first pattern portion 50a and the second pattern portion 50b includes a first pattern 51, a second pattern 52 and a third pattern 53 adjacent to each other, The spacing between the first pattern 51 and the second pattern 52 and the spacing between the second pattern 52 and the third pattern 53 adjacent to each other may be different from each other. 6, the first pattern portion 50a includes the first pattern 51, the second pattern 52, and the third pattern 53. In this embodiment, As an example.

That is, if the adjacent first patterns 51, the second patterns 52, and the third patterns 53 are arranged at regular intervals, the first patterns 51, the second patterns 52, The light path is similarly changed by the pattern 53 so that a band shape as in the bonding portion S of the first diffusion plate 42 and the second diffusion plate 44 can be formed at each interval .

Accordingly, in the present invention, by arranging the first pattern 51, the second pattern 52 and the third pattern 53 adjacent to each other at mutually different intervals and changing the light path, it is possible to prevent the occurrence of a band shape at another position do.

FIGS. 8A and 8B are views comparing images displayed through the diffuser plate when the pattern units included in the diffuser plate are arranged at an arbitrary interval and when the pattern units are arranged at regular intervals. FIG.

8A is an image displayed through the diffusion plate 40 when the first pattern unit 50a or the second pattern unit 50b included in the diffusion plate is arranged at an arbitrary interval, Is an image displayed through the diffusion plate 40 when the first pattern unit 50a or the second pattern unit 50b is disposed at a constant interval (6 mm).

In FIG. 8A, a band is not recognized to recognize the bonding portion S of the first diffusion plate 42 and the second diffusion plate 44, but the first pattern portion 50a or the second In the case where the pattern units 50b are disposed at regular intervals, it can be confirmed that another band shape is generated for each interval in which the first pattern unit 50a or the second pattern unit 50b is arranged.

In addition, at least two of the first pattern 51, the second pattern 52 and the third pattern 53 according to the second embodiment of the present invention are provided at positions that do not correspond to each other.

The positions of both end points of the first pattern 51, the second pattern 52 and the third pattern 53 are assumed to be coordinates in the XY plane, assuming that the diffusion plate 40 lies on the XY plane , It is defined that the positions of both end points are located at corresponding positions with respect to two patterns having the same Y-axis value.

Specifically, it can be assumed that the Y-axis in the X-Y plane of the second embodiment of the present invention is parallel to the junction S of the diffusion plate 40, and the X-axis is perpendicular to the Y-axis. Assuming that the Y axis values of both end points of the first pattern 51 included in the first pattern portion 50a or the second pattern portion 50b are a and b respectively and the second pattern 52 , The first pattern 51 and the second pattern 52 do not correspond to each other if either a or b is different from c or d or any one of them is different It can be said that it is provided at a position that does not exist.

That is, in the second embodiment of the present invention, in order that the path of light changed by the first pattern 51, the second pattern 52, and the third pattern 53 is not formed with a constant trend, At least two of the first pattern 31, the second pattern 32, and the third pattern 33 are provided at positions which do not correspond to each other.

At least two of the first pattern 51, the second pattern 52 and the third pattern 53 according to the second embodiment of the present invention may have at least one of width, depth, and length.

That is, if any one of the width, depth, and length of the first pattern 51, the second pattern 52, and the third pattern 53 is different from each other, the paths of light passing through the pattern are changed to be different from each other In order to prevent the light path changed by the first pattern 51, the second pattern 52 and the third pattern 53 from being formed with a uniform tendency in the second embodiment of the present invention, 31, the second pattern 32, and the third pattern 33 have different values of at least one of the width, the depth, and the length.

More specifically, the width of the first pattern portion 50a or the second pattern portion 50b for forming a light path similar to the optical path at the junction S of the plurality of diffusion plates 42, , Depth and length conditions.

FIG. 9 is an enlarged view showing the "A" region of FIG. 6 in an enlarged manner.

9, the first pattern portion 50a or the second pattern portion 50b is provided with a predetermined width d, depth h, and length l. At this time, the predetermined width d, depth h and length l are set to be equal to the width of the light diffused through the diffusers 42a and 44a of the first diffusion plate 42 or the second diffusion plate 44, Is changed to be similar to the optical path at the junction S of the plurality of diffusion plates 42, 44, and it is proper to set the value so as not to form another strip shape.

That is, the first diffusion plate 42 and the second diffusion plate 44 of the present invention include the first pattern portion 50a and the second pattern portion 50b, The first pattern portion 50a and the second pattern portion 50b are formed on the non-bonding portion other than the bonding portion S of the first pattern portion 50a by changing the light path similarly to the bonding portion S, 2 pattern unit 50b must be able to change the path of light diffused through the diffusers 42a and 44a.

In addition, since the first pattern portion 50a and the second pattern portion 50b should not generate another band shape on the non-bonding portion other than the bonding portion S, 2 pattern portion 50b should be provided so as to satisfy predetermined width, depth, and length conditions.

The specific conditions for the width d, the depth h and the length l of the first pattern portion 50a and the second pattern portion 50b according to the present invention are as follows.

d? 1 mm,

0.5 mm? H? 1 mm,

50mm? L? 100mm

That is, as in the mathematical expression, the first pattern portion 50a and the second pattern portion 50b each have a width d of 1 mm or less, a depth h of 0.5 mm or more and 1 mm or less, And a length (l) of 100 mm or less.

Since the first pattern portion 50a and the second pattern portion 50b are not necessarily formed to have a constant width, depth or length, the first pattern portion 50a and the second pattern portion 50b ) Are all satisfied so as to satisfy the condition of the mathematical expression.

FIGS. 10A and 10B are views comparing images displayed through a diffuser plate when the pattern unit included in the diffuser plate meets or does not satisfy the width condition according to the present invention.

10A is an image displayed through the diffusion plate 40 when the first pattern portion 50a and the second pattern portion 50b included in the diffusion plate satisfy the width condition according to the present invention, 10b is an image displayed through the diffusion plate 40 when the first pattern portion 50a or the second pattern portion 50b does not satisfy the width condition according to the present invention (minimum width is 1 mm).

10A, a band is not recognized to recognize the junction S between the first diffusion plate 42 and the second diffusion plate 44. However, as shown in FIG. 10B, the first pattern unit 50a or the second diffusion plate 44 When the two-pattern portion 50b exceeds a predetermined width, a band is formed such that the bonding portion S of the first diffusion plate 42 and the second diffusion plate 44 is recognized, It can be confirmed that a band is also formed in a region corresponding to the second pattern portion 50a or the second pattern portion 50b.

That is, when the width of the first pattern portion 50a or the second pattern portion 50b is formed to exceed 1 mm, the optical path changed by the first pattern portion 50a or the second pattern portion 50b is It is possible to confirm that the strip shape is formed in another region corresponding to the pattern as shown in Fig. 10B because the light path is different from the light path at the junction S of the plurality of diffusion plates 42, 44. [

FIGS. 11A and 11B are views comparing images displayed through a diffuser plate when the pattern unit included in the diffuser plate satisfies the depth condition according to the present invention and is not satisfied.

11A is an image displayed through the diffusion plate 40 when the first pattern portion 50a and the second pattern portion 50b included in the diffusion plate satisfy the depth condition according to the present invention, 11b is an image displayed through the diffusion plate 40 when the first pattern portion 50a or the second pattern portion 50b does not satisfy the depth condition according to the present invention (less than 0.5 mm).

11A, a band is not recognized to recognize the joint portion S of the first diffusion plate 42 and the second diffusion plate 44. However, as shown in FIG. 11B, the first pattern portion 50a or the second diffusion plate 44 It can be confirmed that a band is formed such that the bonding portion S of the first diffusion plate 42 and the second diffusion plate 44 can be recognized when the two pattern portions 50b do not have a predetermined depth.

That is, when the depth of the first pattern portion 50a or the second pattern portion 50b is less than 0.5 mm, the depth of the first pattern portion 50a or the second pattern portion 50b is too shallow, It is confirmed that the light path is not changed to the first diffusion plate 42 and the band shape is formed in the region corresponding to the bonding region S of the first diffusion plate 42 and the second diffusion plate 44 as shown in FIG. have.

In addition, if the depths of the first pattern portion 50a and the second pattern portion 50b are 0.5 mm or more, the path of the light can be changed so that the distance between the first diffusion plate 42 and the second diffusion plate 44 It is preferable that the thickness of the diffusion plate 40 is set to 1.0 mm or less considering the fact that the thickness of the diffusion plate 40 is 1.2T to 2.0T. The upper limit value of the depth condition may be set to a different value depending on the thickness of the diffusion plate 40.

FIGS. 12A and 12B are diagrams comparing images displayed through a diffuser plate when the pattern unit included in the diffuser plate satisfies the length condition according to the present invention and is not satisfied.

12A is an image displayed through the diffusion plate 40 when the first pattern portion 50a and the second pattern portion 50b included in the diffusion plate satisfy the length condition according to the present invention, 12b is a view of the image displayed through the diffusion plate 40 when the first pattern portion 50a or the second pattern portion 50b does not satisfy the length condition according to the present invention (less than 45 mm, more than 105 mm) to be.

12A, a band is not recognized to recognize the bonding portion S of the first diffusion plate 42 and the second diffusion plate 44. However, as shown in FIG. 12B, the first pattern portion 50a or the second diffusion plate 44 When the length of the two-pattern portion 50b is out of the predetermined range, a band is formed so that the bonding portion S of the first diffusion plate 42 and the second diffusion plate 44 can be recognized, It can be confirmed that a band is also formed in a region corresponding to the pattern portion 50a or the second pattern portion 50b.

That is, when the length of the first pattern portion 50a or the second pattern portion 50b is formed to be out of a predetermined range, the first pattern portion 50a or the second pattern portion 50b may be changed It is confirmed that the optical path of the light path is different from the optical path of the bonding portion S of the plurality of diffusion plates 42 and 44 so that the strip shape is formed in another region corresponding to the pattern as shown in Fig. have.

13 is an exploded perspective view of a liquid crystal display device including a diffusing plate according to a second embodiment of the present invention.

13, the liquid crystal display includes a liquid crystal panel 60, a backlight unit 100, a support main 130, a bottom cover 70, and a case top 90.

The liquid crystal panel 60 plays a key role in image display and includes an upper substrate 60a and a lower substrate 60b which are bonded to each other with a liquid crystal layer (not shown) interposed therebetween.

Though not shown in FIG. 13, a pixel is defined by a plurality of gate lines and data lines crossing the inner surface of the lower substrate 60b, and a thin film transistor Thin is formed at each intersection of the gate line and the data line. Film transistors, TFTs, and the like are connected to the transparent pixel electrodes formed on the pixels in a one-to-one correspondence manner.

On the inner surface of the upper substrate 60a, for example, a color filter of red (R), green (G), and blue (B) Lines, and black matrixes for covering non-display elements such as thin film transistors. In addition, a transparent common electrode covering these elements is provided.

However, the color filter is not necessarily formed on the upper substrate 60a, and in the case of a color filter on TFT (COT) type liquid crystal panel 60, It is also possible that a color filter is provided on the TFT of the TFT 60b.

A flexible printed circuit board (FPCB) or a tape carrier package (TCP) is connected to at least one edge of the liquid crystal panel 60 via a connection member (not shown) The substrate 65 is connected.

At this time, the printed circuit board 65 is divided into a gate driving circuit for scanning on / off signals of the thin film transistors to gate lines, and a data driving circuit for transmitting frame-by-frame image signals to the data lines, (60). ≪ / RTI >

When the thin film transistor selected for each gate line is turned on by the on / off signal of the gate driving circuit to be scanned, the liquid crystal panel 60 having the above-described structure is supplied with the signal voltage of the data driving circuit through the data line And the alignment direction of the liquid crystal molecules is changed by the electric field between the pixel electrode and the common electrode, thereby exhibiting a difference in transmittance.

In addition, a backlight unit 100 for providing light to the back surface of the liquid crystal panel 60 is provided in the liquid crystal display device according to the present invention so that the difference in transmittance represented by the liquid crystal panel 60 is externally expressed.

The backlight unit 100 includes a light source package 110 and a diffusion plate 40 and a plurality of optical sheets 30 provided on the light source package 110.

The light source package 110 includes a PCB (not shown) arranged to have a constant spacing along the longitudinal inner surface of the bottom cover 70, a reflective portion 20 and a plurality of light sources 10 mounted on the PCB, .

In this case, a metal core PCB having a heat dissipating function may be used as a PCB, and a heat sink is provided on the back surface of the metal core printed circuit board to receive heat from the respective light sources 10, It is also possible to emit.

The plurality of optical sheets 30 may include various functional sheets such as a reflective polarizing film called DBEF (Dual Brightness Enhancement Film) or a prism.

The light provided from the plurality of light sources 10 passes through the diffusion plate 40 and the optical sheet 30 in order and is incident on the liquid crystal panel 60. The liquid crystal panel 60, It is possible to display a high-luminance image externally.

Particularly, since the liquid crystal display according to the embodiment of the present invention can be a very large model, the diffusion plate 40 can be provided by joining a plurality of diffusion plates 42 and 44, The first pattern portion 50a and the second pattern portion 50b are provided on the surface of the diffusion plate 42 and 44 so as to prevent the band shape on the junction portion of the plurality of diffusion plates 42 and 44 from being recognized.

The liquid crystal panel 60 and the backlight unit 100 are modularized through a case top 90, a support main 140 and a bottom cover 70. The case top 90 includes a liquid crystal panel 60, And is configured to display an image realized in the liquid crystal panel 60 by opening a front surface of the case top 90 with a rectangular frame shape having a cross section bent in the shape of "a" so as to cover the upper and side edges.

The bottom cover 70 serves as a bottom case for housing the backlight unit 100 and includes a support side (not shown) for changing the path of the light toward the liquid crystal panel 60 .

A square main support main body 130 mounted on the bottom cover 70 and covering the edges of the liquid crystal panel 60 and the backlight unit 100 is mounted on the case top 90 and the bottom cover 70 .

Although the embodiments of the present invention have been described in detail with reference to the accompanying drawings, it is to be understood that the present invention is not limited to those embodiments and various changes and modifications may be made without departing from the scope of the present invention. . Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. Therefore, it should be understood that the above-described embodiments are illustrative in all aspects and not restrictive. The scope of protection of the present invention should be construed according to the claims, and all technical ideas within the scope of equivalents should be interpreted as being included in the scope of the present invention.

10: light source 20:
30: optical sheet 40: polarizer
50: pattern part 60: liquid crystal panel
70: bottom cover 80: guide panel
90: Case top 100: Backlight unit
110: Light source package 130: Support main

Claims (10)

A first diffusing plate and a second diffusing plate to which facing sides are bonded to each other;
A first pattern portion provided on the first diffusion plate; And
And a second pattern portion provided on the second diffusion plate. The method according to claim 1,
Wherein at least one of the first pattern portion and the second pattern portion is provided in parallel with a direction in which the first diffusion plate and the second diffusion plate are joined. 3. The method of claim 2,
Wherein the first pattern portion is provided on the upper surface of the first diffusion plate and the second pattern portion is provided on the upper surface of the second diffusion plate. The method of claim 3,
Wherein at least one of the first pattern portion and the second pattern portion includes a first pattern, a second pattern and a third pattern adjacent to each other,
Wherein an interval between the first pattern and the second pattern and a spacing between the second pattern and the third pattern are different from each other. 5. The method of claim 4,
Wherein at least two of the first pattern, the second pattern and the third pattern are provided at positions which do not correspond to each other. 5. The method of claim 4,
Wherein at least two of the first pattern, the second pattern, and the third pattern are different in width, depth, or length from each other. The method of claim 3,
The first pattern unit may have a predetermined width, depth, and length to change the path of the light diffused through the first diffusion plate. The second pattern unit may change the path of the light diffused through the second diffusion plate Depth, and length of predetermined width, depth, and length. 8. The method of claim 7,
The width (d), the depth (h), and the length (l) of the first pattern portion and the second pattern portion,
d? 1 mm,
0.5 mm? H? 1 mm,
50mm? L? 100mm
. The method of claim 3,
Wherein the first pattern portion is concave with respect to the upper surface of the first diffuser plate and the second pattern portion is concave with respect to the upper surface of the second diffuser plate. A liquid crystal panel; And
And a backlight unit disposed below the liquid crystal panel,
Wherein the backlight unit includes the diffuser plate according to any one of claims 1 to 9.

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