KR101354358B1 - Optical plate and backlight assembly having the same - Google Patents

Abstract

Disclosed are an optical plate and a backlight assembly having the same, which can simplify the structure, improve light efficiency, and reduce cost.

An optical plate of the present invention, the base plate; And a plurality of prism patterns formed on the base plate, and the angles of the respective prism patterns are formed to be different from each other.

Optical plate, prism plate, prism pattern, mount angle, light efficiency

Description

Optical plate and backlight assembly having the same

1 is a schematic illustration of a conventional direct backlight assembly;

2 is a schematic illustration of a direct backlight assembly according to the present invention;

3 shows a prism plate according to a first embodiment of the present invention in the backlight assembly of FIG.

4 is a view showing a path of light in a prism plate according to the first embodiment of the present invention.

5 shows a prism plate according to a second embodiment of the present invention in the backlight assembly of FIG.

6 is a view showing a path of light in a prism plate according to a second embodiment of the present invention.

7 shows a prism plate according to a third embodiment of the present invention in the backlight assembly of FIG.

8 is a view showing a path of light in a prism plate according to a third embodiment of the present invention.

9 shows a prism plate according to a fourth embodiment of the present invention in the backlight assembly of FIG.

<Explanation of symbols for the main parts of the drawings>

1: bottom cover 3: lamp

5: prism plate 13: prism pattern

21, 31, 41, 51: base plate 23, 33, 43: first prism pattern

25, 35, 45: second prism pattern 27, 37, 47: third prism pattern

29, 39, 49: fourth prism pattern

The present invention relates to a backlight assembly, and more particularly, to an optical plate and a backlight assembly having the same, which can simplify the structure, improve the light efficiency and reduce the cost.

As the information society develops, the demand for display devices is increasing in various forms. In response to this, various flat panel display devices including liquid crystal display (LCD), plasma display panel (PDP) and electro luminescent display (ELD) have been studied. Some are already widely used as display devices.

Among them, the liquid crystal display device is presently excellent in image quality and has advantages such as light weight, thinness, low power consumption, and the like, thereby rapidly replacing the CRT. The liquid crystal display is being developed in various ways such as a monitor of a notebook, a display panel of a television.

The liquid crystal display includes a liquid crystal panel in which a plurality of pixels are arranged in a matrix form, and a backlight assembly disposed on a rear surface of the liquid crystal panel to irradiate light to the liquid crystal panel.

The backlight assembly is divided into an edge type in which a light source is provided at a side, and a direct type in which a plurality of light sources are provided at predetermined intervals.

1 is a view schematically showing a conventional direct type backlight assembly.

As shown in FIG. 1, a plurality of lamps 115 generating light in the bottom cover 110 is disposed. An optical sheet 150 for controlling light is disposed on the lamp 115. The optical sheet 150 includes a diffusion sheet 130 for diffusing light and a prism sheet 140 disposed on the diffusion sheet 130 to condense the light. If necessary, a diffusion sheet disposed on the diffusion sheet 130 to diffuse the light again may be further added.

Since the optical sheet 150 is made of a thin sheet, it is not supported and sags downward. The diffusion plate 120 is disposed between the lamp 115 and the optical sheet 150 to prevent sagging of the optical sheet 150 and to support diffusion of light. The diffusion plate 120 may be formed thick to serve as a support. Therefore, the optical sheet 150 may be disposed in parallel by the diffusion plate 120 without sagging in the downward direction.

However, since the conventional direct backlight assembly requires a plurality of sheets such as the diffusion plate 120, the diffusion sheet 130, and the prism sheet 140 to control the light, the structure is complicated.

In addition, the conventional direct type backlight assembly is provided with a diffusion plate 120 and a diffusion sheet 130 instead of a single optical member to diffuse the light, the cost is increased as the same function is used repeatedly.

In addition, the conventional direct backlight assembly has to optimize the structure of the diffusion plate 120 and the diffusion sheet 130 to diffuse light. However, there is a problem in that it is not easy to obtain the optimal light efficiency by optimizing the diffusion plate 120 and the diffusion sheet 130.

In addition, the conventional direct type backlight assembly has a problem in that light loss occurs in each sheet as a plurality of sheets are provided, thereby reducing light efficiency.

It is an object of the present invention to provide an optical plate and a backlight assembly having the same that can simplify the structure.

Another object of the present invention is to provide an optical plate and a backlight assembly having the same that can reduce the cost.

Still another object of the present invention is to provide an optical plate capable of improving light efficiency and a backlight assembly having the same.

According to a first embodiment of the present invention for achieving the above object, the optical plate, the base plate; And a plurality of prism patterns formed on the base plate, and the angles of the respective prism patterns are formed to be different from each other.

According to a second embodiment of the present invention, an optical plate comprises: a base plate; And a plurality of prism patterns formed on the base plate, wherein the heights of the respective prism patterns are different from each other.

According to a third embodiment of the present invention, an optical plate comprises: a base plate; And a plurality of prism patterns formed on the base plate, and the angles and heights of the respective prism patterns are different from each other.

According to a fourth embodiment of the present invention, an optical plate comprises: a base plate; And a plurality of prism patterns formed on the base plate, wherein the base plate contains a light transmitting material having a front light transmittance in a range of 50% to 100%.

According to a fifth embodiment of the present invention, a backlight assembly includes a bottom cover; A plurality of light sources disposed on the bottom cover; And a prism plate disposed on the plurality of light sources, wherein the prism plate comprises: a base plate; And a plurality of prism patterns formed on the base plate, and the angles of the respective prism patterns are formed to be different from each other.

According to a sixth embodiment of the present invention, a backlight assembly includes a bottom cover; A plurality of light sources disposed on the bottom cover; And a prism plate disposed on the plurality of light sources, the prism plate comprising: a base plate; And a plurality of prism patterns formed on the base plate, wherein the heights of the respective prism patterns are different from each other.

According to a seventh embodiment of the present invention, a backlight assembly includes: a bottom cover; A plurality of light sources disposed on the bottom cover; And a prism plate disposed on the plurality of light sources, the prism plate comprising: a base plate; And a plurality of prism patterns formed on the base plate, and the angles and heights of the respective prism patterns are different from each other.

According to an eighth embodiment of the present invention, a backlight assembly includes a bottom cover; A plurality of light sources disposed on the bottom cover; And a prism plate disposed on the plurality of light sources, wherein the base plate contains a light transmitting material whose front light transmittance may range from 50% to 100%.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a view schematically showing a direct type backlight assembly according to the present invention.

Referring to FIG. 2, a plurality of lamps 3 for generating light in the bottom cover 1 is disposed. The lamp 3 may be a cold cathode fluorescent lamp or an external electrode fluorescent lamp. Instead of the lamp 3, a plurality of light emitting diodes may be mounted in a package having a longitudinal direction. A reflector may be attached to the inner surface of the bottom cover 1 to reflect light. The lamp 3 is disposed spaced apart from the bottom cover 1 by a predetermined interval. To this end, a supporting member may be disposed between the lamp 3 and the bottom cover 1 so that the lamp 3 is spaced apart from the bottom cover 1 by a predetermined distance.

A prism plate 5 is arranged on the lamp 3. A plurality of prism patterns 13 are formed in the prism plate 5 along the longitudinal direction of the lamp 3.

According to an embodiment, a plurality of prism patterns 13 may be formed in the prism plate 5 so as to be perpendicular to the longitudinal direction of the lamp 3.

The shape of the prism plate 5 may be determined by the height H, the peak angle θ, and the pitch P of the prism pattern 13.

The prism plate 5 has a diffusion function and a condensing function at the same time by appropriately adjusting its shape, so that light can be easily controlled to improve light efficiency.

The backlight assembly of the present invention can simplify the structure and reduce the cost by removing all of the conventional diffusion sheet and prism sheet and having only one prism plate 5.

The shape of the prism plate 5 is demonstrated below.

3 is a view showing a prism plate according to the first embodiment of the present invention in the backlight assembly of FIG.

As shown in FIG. 3, a plurality of prism patterns 23, 25, 27, and 29 are formed on the base plate 21 on the prism plate 5. The prism patterns 23, 25, 27, and 29 may be formed integrally or separately with the base play.

Each of the prism patterns 23, 25, 27, and 29 may have the same height H, and the mountain angles θ may be different from each other.

For example, when seven prism patterns are formed, the peak angle θ1 of the prism pattern in the center region, for example, the first prism pattern 23 is the largest, and the adjacent prism pattern, for example, the second prism pattern 25, is formed. The peak angle θ2 is next larger, the next adjacent prism pattern, for example the peak angle θ3 of the third prism pattern 27, is next larger, and the prism pattern of the edge region, for example the fourth prism pattern 29, is The mount angle θ4 may be formed to be the smallest.

It may be formed to decrease in the range of 0.1% to 10% between the peak angles θ1, θ2, θ3, and θ4 of the first to fourth prism patterns 23, 25, 27, and 29 from the center region to the edge region. .

This is according to an exemplary embodiment, and the peak angles θ1, θ2, θ3, and θ4 of the first to fourth prism patterns 23, 25, 27, and 29 may increase from the first area to the second area. . In addition, the mountain angles θ1, θ2, θ3, and θ4 of the first to fourth prism patterns 23, 25, 27, and 29 may be repeatedly decreased and increased.

The thickness D of the base plate 21 has a range of 0.5 mm to 3 mm, the pitch defining the width of the mountain has a range of 0.05 mm to 0.3 mm, and the mountain angles θ1, θ2, θ3, and θ4. Has a range of 80 ° to 160 °, and the height H of the mountain may range from 0.0044 mm to 0.18 mm.

In the prism plate 5 formed as described above, as shown in FIG. 4, each of the peak angles θ1, θ2, θ3, and θ4 of the first to fourth prism patterns 23, 25, 27, and 29 are formed in the center region. Since it is smaller toward the edge region, the light irradiated from the light source may be adjusted to travel forward in parallel in each prism pattern 23, 25, 27, and 29 to implement a prism function.

In particular, since the first to second prism patterns 23 and 25 of the central region may diffuse a part of the light irradiated from the light source, the diffusion function may also be implemented.

Therefore, in the present invention, the diffusion function and the prism function can be simultaneously implemented using one prism plate 5, so that it is not necessary to provide a diffusion sheet or a prism sheet separately as in the prior art, thereby simplifying the structure and reducing the cost. Can be.

In addition, the present invention can improve the light efficiency by minimizing the light loss caused by the plurality of sheets as not to use a plurality of sheets.

In addition, the present invention can improve the uniformity of the light by reducing the angle of the mountain of the plurality of prism patterns 23, 25, 27, 29 formed on the prism plate 5 from the center region to the edge region.

FIG. 5 illustrates a prism plate according to a second embodiment of the present invention in the backlight assembly of FIG. 2.

As shown in FIG. 5, a plurality of prism patterns 33, 35, 37, and 39 are formed on the base plate 31 on the prism plate 5. The prism patterns 33, 35, 37, and 39 may be formed integrally or separately with the base play.

Each of the prism patterns 33, 35, 37, and 39 may have a same peak angle θ and a different height H.

For example, when seven prism patterns are formed, the height H1 of the prism pattern in the center region, for example, the first prism pattern 33 is the smallest, and the height of the adjacent prism pattern, for example, the second prism pattern 35. (H2) is next smaller, and the height H3 of the next adjacent prism pattern, for example, the third prism pattern 37, is next smaller, and the height of the prism pattern, for example, the fourth prism pattern 39 of the edge region ( H4) can be formed to be the largest.

It may be formed to increase in the range of 0.5% to 20% between the height (H1, H2, H3, H4) of the first to fourth prism patterns (33, 35, 37, 39) from the central region to the edge region.

According to an exemplary embodiment, the heights H1, H2, H3, and H4 of the first to fourth prism patterns 23, 25, 27, and 29 may decrease from the first area to the second area. In addition, the heights H1, H2, H3, and H4 of the first to fourth prism patterns 23, 25, 27, and 29 may be repeatedly decreased and increased.

The thickness D of the base plate 31 has a range of 0.5 mm to 3 mm, the pitch defining the width of the mountain has a range of 0.05 mm to 0.3 mm, and the mountain angle θ is 80 ° to 160 °. The height of the mountains (H1, H2, H3, H4) may have a range of 0.0044mm to 0.18mm.

As illustrated in FIG. 6, the prism plates 5 formed as described above have respective heights H1, H2, H3, and H4 of the first to fourth prism patterns 33, 35, 37, and 39 being edged at the center region. Since the light is increased toward the region, the light irradiated from the light source may be adjusted to travel forward in parallel in each prism pattern 33, 35, 37, or 39, thereby implementing a prism function.

In particular, since the first to second prism patterns 33 and 35 of the central region may diffuse a part of the light irradiated from the light source, the diffusion function may also be implemented.

Therefore, in the present invention, the diffusion function and the prism function can be simultaneously implemented using one prism plate 5, so that it is not necessary to provide a diffusion sheet or a prism sheet separately as in the prior art, thereby simplifying the structure and reducing the cost. Can be.

In addition, the present invention can improve the light efficiency by minimizing the light loss caused by the plurality of sheets as not to use a plurality of sheets.

In addition, the present invention can improve the uniformity of the light by reducing the angle of the mountain of the plurality of prism patterns 33, 35, 37, 39 formed on the prism plate 5 from the center region to the edge region.

FIG. 7 illustrates a prism plate according to a third embodiment of the present invention in the backlight assembly of FIG. 2.

As illustrated in FIG. 7, a plurality of prism patterns 43, 45, 47, and 49 are formed on the base plate 41 on the prism plate 5. The prism patterns 43, 45, 47, and 49 may be formed integrally or separately with the base play.

Each of the prism patterns 43, 45, 47, and 49 may be formed such that height H and peak angle θ are different from each other.

For example, when seven prism patterns are formed, the peak angle θ1 of the prism pattern in the center region, for example, the first prism pattern 43 is the largest, and the adjacent prism pattern, for example, the second prism pattern 45, is formed. The peak angle θ2 is next larger, the next adjacent prism pattern, for example the peak angle θ3 of the third prism pattern 47, is next larger, and the prism pattern of the edge region, for example the fourth prism pattern 49, is The mount angle θ4 may be formed to be the smallest.

It may be formed to decrease in the range of 0.1% to 10% between the peak angles θ1, θ2, θ3, and θ4 of the first to fourth prism patterns 43, 45, 47, and 49 from the center region to the edge region. .

The acid angles θ1, θ2, θ3, and θ4 of the first to fourth prism patterns 43, 45, 47, and 49 may increase from the first area to the second area. In addition, the mountain angles θ1, θ2, θ3, and θ4 of the first to fourth prism patterns 43, 45, 47, and 49 may be repeatedly decreased and increased.

Also, the height H1 of the prism pattern in the center region, for example, the first prism pattern 43, is the smallest, and the height H2 of the adjacent prism pattern, for example, the second prism pattern 45, is the next smaller, and is next adjacent. The height H3 of the prism pattern, for example, the third prism pattern 47, is next smaller, and the prism pattern of the edge region, for example, the height H4 of the fourth prism pattern 49, may be formed to be the largest. .

It may be formed to increase in the range of 0.5% to 20% between the height (H1, H2, H3, H4) of the first to fourth prism patterns 43, 45, 47, 49 from the central region to the edge region.

According to an exemplary embodiment, the heights H1, H2, H3, and H4 of the first to fourth prism patterns 43, 45, 47, and 49 may decrease from the first area to the second area. In addition, the heights H1, H2, H3, and H4 of the first to fourth prism patterns 43, 45, 47, and 49 may be repeatedly decreased and increased.

The thickness D of the base plate 41 has a range of 0.5 mm to 3 mm, the pitch defining the width of the mountain has a range of 0.05 mm to 0.3 mm, and the mountain angles θ1, θ2, θ3, and θ4. Has a range from 80 ° to 160 °, and the heights of the mountains H1, H2, H3, H4 may range from 0.0044 mm to 0.18 mm.

As illustrated in FIG. 8, the prism plates 8 formed as described above have respective peak angles θ1, θ2, θ3, and θ4 of the first to fourth prism patterns 43, 45, 47, and 49. Since the heights H1, H2, H3, and H4 of the first to fourth prism patterns 43, 45, 47, and 49 become larger toward the edge region, the heights of the first to fourth prism patterns 43, 45, 47, and 49 increase from the center region to the edge region. The light may be adjusted to travel forward in parallel in each prism pattern 43, 45, 47, and 49 to implement a prism function.

According to the present invention, the heights H1, H2, H3 and H4 as well as the acid angles θ1, θ2, θ3 and θ4 of the first to fourth prism patterns 43, 45, 47 and 49 are different from each other. The light efficiency can be further improved.

In particular, since the first to second prism patterns 43 and 45 of the central region may diffuse a part of the light irradiated from the light source, the diffusion function may be implemented.

Therefore, in the present invention, the diffusion function and the prism function can be simultaneously implemented using one prism plate 5, so that it is not necessary to provide a diffusion sheet or a prism sheet separately as in the prior art, thereby simplifying the structure and reducing the cost. Can be.

In addition, the present invention can improve the light efficiency by minimizing the light loss caused by the plurality of sheets as not to use a plurality of sheets.

In addition, the present invention can improve the uniformity of the light by reducing the angle of the peak of the plurality of prism patterns 43, 45, 47, 49 formed on the prism plate 5 from the center region to the edge region.

9 illustrates a prism plate according to a fourth embodiment of the present invention in the backlight assembly of FIG. 2.

As illustrated in FIG. 9, a plurality of prism patterns 53 are formed on the base plate 51 on the prism plate 5. The prism pattern 53 may be formed integrally or separately with the base play.

The height H and the angle θ of each of the prism patterns 53 are the same.

Instead, the base plate 51 may be added with a material that determines the transmittance of light, which may have a front light transmittance in a range of 50% to 100%.

In FIG. 9, a light transmitting material is added to only the base plate 51, but a light transmitting material may be added to the plurality of prism patterns 53 as needed.

The thickness D of the base plate 51 has a range of 0.5 mm to 3 mm, the pitch defining the width of the mountain has a range of 0.05 mm to 0.3 mm, and the mountain angle θ is 80 ° to 160 °. It has a range of, the height of the mountain (H) may have a range of 0.0044mm to 0.18mm.

Therefore, the present invention performs a prism function using a plurality of prism patterns 53 formed on the prism plate 5 and performs a diffusion function using a light transmitting material, thereby allowing the prism function by one prism plate 5 to be used. By simultaneously performing the diffusion function, the structure can be simplified and the cost can be reduced.

In addition, the present invention can improve the light efficiency by minimizing the light loss caused by the plurality of sheets as not to use a plurality of sheets.

A liquid crystal panel may be disposed on the backlight assembly configured as described above, and disposed on the liquid crystal panel to fasten the top case to the bottom cover 1 of the backlight assembly.

As described above, according to the present invention, by simultaneously performing the diffusion function and the prism function using one prism plate without using a plurality of sheets as in the prior art, the structure can be simplified and the cost can be reduced.

According to the present invention, since the plurality of sheets are not used, light loss by the plurality of sheets can be minimized to improve light efficiency.

According to the present invention, light can be diffused in the central region of the prism plate, whereby light uniformity can be enhanced to improve light efficiency.

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. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification, but should be defined by the claims.

Claims (46)

delete delete delete delete delete delete delete delete delete delete delete delete A base plate; And A plurality of prism patterns formed on the base plate, One of the mountain angle and the height of each prism pattern is formed to be different from each other, The base plate contains a light transmitting material which may have a front light transmittance in a range of 50% to 100%, A first prism pattern formed at a central portion on the base plate and a second prism pattern formed adjacent to the first prism pattern to diffuse a part of light; And the prism pattern contains a light transmitting material, and the base plate and the prism pattern are formed separately. The optical plate of claim 13, wherein the angles of the respective prism patterns are formed to be smaller from the central area to the edge area. The optical plate of claim 13, wherein the peak angle of each prism pattern is formed to increase from the central region to the edge region. 14. The optical plate of claim 13, wherein the angle of angle of each prism pattern is repeatedly reduced and increased. 17. The optical plate of claim 16 wherein the angle between the peak angles of each prism pattern varies in a range of 0.1% to 10%. The optical plate of claim 13, wherein a height of each prism pattern increases from a central area to an edge area. 19. The optical plate of claim 18 wherein the height between each prism pattern varies in a range of 0.5% to 20%. The optical plate of claim 13, wherein the height of each prism pattern is formed to be smaller from the central area to the edge area. The optical plate of claim 13, wherein the height of each prism pattern is repeatedly decreased and increased. delete The method of claim 13, wherein the thickness of the base plate has a range of 0.5mm to 3mm, the pitch has a range of 0.05mm to 0.3mm, the mountain angle has a range of 80 ° to 160 °, the height of the mountain is 0.0044 Optical plate having a range of mm to 0.18mm. delete delete delete delete delete delete delete delete delete delete Bottom cover; A plurality of light sources disposed on the bottom cover; And A prism plate disposed on the plurality of light sources, The prism plate, A base plate; And A plurality of prism patterns formed on the base plate, One of the mountain angle and the height of each prism pattern is formed to be different from each other, The base plate contains a light transmitting material which may have a front light transmittance in a range of 50% to 100%, A first prism pattern formed at a center portion of the base plate and a second prism pattern formed adjacent to the first prism pattern diffuse a portion of the light irradiated from the light source, And the prism pattern contains a light transmitting material, and the base plate and the prism pattern are formed separately. 35. The backlight assembly of claim 34, wherein the peak angle of each prism pattern is formed to be smaller from the central area to the edge area. 36. The backlight assembly of claim 35, wherein the angle between the peak angles of each prism pattern is in a range of 0.1% to 10%. 35. The backlight assembly of claim 34, wherein the peak angle of each prism pattern is formed to increase from the central region to the edge region. 35. The backlight assembly of claim 34, wherein the peak angle of each prism pattern is repeatedly reduced and increased. 35. The backlight assembly of claim 34, wherein the height of each prism pattern increases from the central area to the edge area. 40. The backlight assembly of claim 39, wherein the height of each prism pattern varies between 0.5% and 20%. 35. The backlight assembly of claim 34, wherein the height of each prism pattern is formed to be smaller from the central area to the edge area. 35. The backlight assembly of claim 34, wherein the height of each prism pattern is repeatedly reduced and increased. delete 35. The backlight assembly of claim 34, wherein the light source is any one of a cold cathode fluorescent lamp, an external electrode fluorescent lamp, and a light emitting diode. The backlight assembly of claim 34, wherein the prism pattern is formed along a length direction of the light source. 35. The backlight assembly of claim 34, wherein the prism pattern is formed perpendicular to the longitudinal direction of the light source.

Images