KR20060068156A - Light diffusing member, back light assembly having the optical member, and display device having the back light assembly - Google Patents

Abstract

A light diffusing member, a backlight assembly having the same, and a display device having the same are disclosed. The light diffusing member has a first face, a second face facing the first face, and at least one groove formed on the second face, and an optical part having a ridge connected to the groove. The first thickness between the floor and the first face is 1.15 to 1.80 times the second thickness between the groove and the first face. As a result, the structure of the light diffusing member for diffusing the light is changed to further improve the brightness and the uniformity of the light, and to further improve the display quality of the image generated from the display device.

Description

LIGHT DIFFUSING MEMBER, BACK LIGHT ASSEMBLY HAVING THE OPTICAL MEMBER, AND DISPLAY DEVICE HAVING THE BACK LIGHT ASSEMBLY}

1 is a plan view of a light diffusing member according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along line II ′ of the light diffusion member illustrated in FIG. 1.

3 is a graph showing the luminance distribution of the light diffusing member according to the first embodiment of the present invention.

4 is a graph of luminance and luminance uniformity analyzed by a statistical analysis program.

5 is a cross-sectional view of the light diffusing member according to the second embodiment of the present invention.

6 is a cross-sectional view of the light diffusing member according to the third embodiment of the present invention.

7 is a cross-sectional view of the light diffusing member according to the fourth embodiment of the present invention.

8 is a conceptual diagram conceptually illustrating a backlight assembly according to a fifth embodiment of the present invention.

9 is an exploded perspective view illustrating in detail the backlight assembly illustrated in FIG. 8.

FIG. 10 is an enlarged view of a portion 'A' of the backlight assembly shown in FIG. 9.                 

11 is a conceptual diagram of a display device according to a sixth embodiment of the present invention.

FIG. 12 is an exploded perspective view illustrating the backlight assembly illustrated in FIG. 11 in detail.

The present invention relates to a light diffusing member, a backlight assembly having the same, and a display device having the same. More specifically, the present invention relates to a light diffusing member for improving the luminance of light and the luminance uniformity of light, a backlight assembly having the same, and a display device having the same.

In general, a display device converts data processed by an information processing device into an image.

A liquid crystal display device, which is one of display devices, includes a liquid crystal, a liquid crystal controlling part for controlling the liquid crystal, and a light providing part for providing light to the liquid crystal to display an image. light providing part).

The liquid crystal has an electrical characteristic in which the arrangement is changed by an electric field and an optical characteristic in which the transmittance of light is changed in accordance with the arrangement.

The liquid crystal control part includes a pair of substrates and electrodes disposed on each substrate. A liquid crystal is interposed between the substrates, and an electric field is formed between the electrodes to change the arrangement of the liquid crystals.

The light providing part provides light to the liquid crystal contained in the liquid crystal control part. The light providing part includes a lamp for generating light applied to the liquid crystal and a light diffusing member for further improving the brightness of the light and the brightness uniformity of the light.

As the lamp employed in the light providing part, a cold cathode fluorescent lamp (CCFL) having a rod shape is mainly used. The light diffusing member includes a plate-shaped diffusing plate which removes bright lines generated by the cold cathode ray tube lamp and improves the brightness of the light.

However, it is difficult to remove the bright lines generated by the cold cathode ray tube lamp by the conventional diffusion plate having a plate shape, and thus, the display quality of the image generated from the liquid crystal control part is reduced.

Accordingly, the present invention is intended to substantially eliminate one or more problems and limitations of the prior art.

One object of the present invention is to provide a light diffusion member which removes bright lines generated by a light source and improves luminance.

Another object of the present invention is to provide a backlight assembly including the light diffusing member.

Another object of the present invention is to provide a display device including the backlight assembly.

In order to realize one object of the present invention, the light diffusing member according to the present invention has a first surface, a second surface facing the first surface and at least one groove formed on the second surface and the floor connected to the groove. It has an optical part formed. The first thickness between the floor and the first face is 1.15 to 1.80 times the second thickness between the groove and the first face.

In addition, in order to implement another object of the present invention, the backlight assembly according to the present invention includes a diffusion member and a light source. The diffusing member includes a first surface on which light is emitted, a second surface facing the first surface, and at least one groove formed on the second surface and the second surface, and a floor connected to the groove. The first thickness between the floor and the first face is 1.15 to 1.80 times the second thickness between the groove and the first face. The light source is disposed to face the second surface and is disposed at a portion corresponding to the floor to generate light.

In addition, in order to realize another object of the present invention, the display device according to the present invention includes a diffusion plate, a lamp and a display panel. The diffusion plate includes a light exit surface, a light incident surface facing the light exit surface, and at least one groove formed on the light incident surface and a floor connected to the groove. The first thickness between the floor and the light exit surface is 1.15 to 1.80 times the second thickness between the groove and the light exit surface. The lamp is disposed to face the light incident surface and is disposed in a portion corresponding to the floor to generate light. The display panel includes a display panel that generates an image based on the diffused light passing through the light exit surface.

According to this invention, generation | occurrence | production of a bright line is suppressed and the brightness of light and the brightness uniformity of light are greatly improved.                     

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

Light diffusing member

Example 1

1 is a plan view of a light diffusing member according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view taken along line II ′ of the light diffusion member illustrated in FIG. 1.

1 and 2, the light diffusing member 100 according to the present exemplary embodiment has a first surface 110 and a second surface 120 facing the first surface 110. The light diffusing member 100 has, for example, a rectangular parallelepiped plate shape.

Examples of the material constituting the light diffusing member 100 include polymethacrylacrylate (PMMA) and the like. The light diffusing member 100 according to the present exemplary embodiment emits light incident on the second surface 120 to the first surface 110. The light emitted to the first surface 110 includes diffused light.

The first surface 110 is a flat surface, and the optical unit 130 is formed on the second surface 120 to improve the brightness and uniformity of the light.

The optical unit 130 includes a groove 132 and a ridge 134 formed in proximity to the groove 132.

In the present embodiment, the plurality of grooves 132 are formed on the second surface 120 in parallel with each other, and the grooves 132 are formed spaced apart from each other by a predetermined interval. The inner side of each groove 132 has a radius of curvature r. The radius of curvature r of the inner surface of each groove 132 is, for example, about 0.5 mm to 1 mm.

The floor 134 is formed between the grooves 132, and the floor 134 is connected to the adjacent grooves 132. The floor 132 connected to the groove 132 has a radius of curvature R. The curvature radius R of each floor 134 is about 0.5 mm-1 mm, for example. The floor 134 has a semicircular cylinder shape when viewed on a plane.

In the present embodiment, the first surface 110 and the floor 134 are formed by the optical unit 130 having the grooves 132 and the floor 134 to increase the brightness of the light and the brightness uniformity of the light. The thickness T and the second thickness t formed by the mutually perpendicular first surface 110 and groove 132 are precisely adjusted.

In this embodiment, the first thickness T is defined as the thickest of the thicknesses formed by the first face 110 and the ridge 134. In addition, the second thickness t is defined as the thinnest thickness among the thicknesses of the first surface 110 and the groove 133. In the present embodiment, the second thickness t is most preferably 1.5 mm to 2.0 mm, for example.

3 is a graph showing the luminance distribution of the light diffusing member according to the first embodiment of the present invention.

A plurality of light diffusing members are provided to measure the change in luminance according to the change in the first thickness T and the second thickness t. Each light diffusing member is different from the first thickness T and the second thickness t. For example, the first thickness T of the light diffusing member is changed between about 1.0 times and 1.80 times with respect to the second thickness t.                     

In addition, in order to measure the brightness of the light emitted from the first surface 110 of the light diffusing member 100, the light diffusing member 100 is made of a polymethylmethyl acrylate material, the groove of the light diffusing member 100 The radius of curvature r of 132 is about 0.5 mm, and the radius of curvature R of the ridge 134 of the light diffusing member 100 is about 1 mm. Further, a lamp for providing light to the light diffusing member 100 is disposed under the floor 134, the distance between the light diffusing member 100 and the lamp is about 11.8mm, the distance between the lamp center is about 20.0mm to be. In addition, the luminance of the light emitted to the first surface 110 of the light diffusing member 100 is an average value measured at about nine places of the first surface 110.

2 and 3, the x-axis of the graph is the first thickness T of the light diffusing member 100, and the y-axis is the first of each light diffusing member 100 having a different first thickness T and a second thickness t. The brightness of the light emitted to the plane 110.

Referring to the graphs of FIGS. 2 and 3, the light diffusing member 100 has a first thickness T increased between about 1.15 times and 1.76 times the second thickness t, and the first thickness T of the light diffusing member 100 is increased. When is about 1.15 times to 1.76 times the second thickness t, the luminance of the light emitted to the first surface 110 is greatly improved.

When the first thickness T of the light diffusing member 100 is changed with respect to the second thickness t, the luminance of the light emitted from the first surface 110 is shown in Table 1 below.

First thickness (mm) Luminance (nit) Comparative example 1.0t 11500 Experimental Example 1 1.15t 12140 1.25 t 13476 1.3t 13720 1.35 t 13980 1.4t 14050 Experimental Example 2 1.45t 14080 1.5t 14130 1.55t 14220 Experimental Example 3 1.6t 14400 1.67 t 14500 Experimental Example 4 1.75t 13400

Experimental Example 1

The light diffusing member of the comparative example has the same first thickness T and second thickness t. The brightness of light emitted from the light diffusing member having the same first thickness T and second thickness t was about 11,500 [nit]. In this case, nit is a unit of brightness and 1 nit is 1 cd / m ² .

The luminance of light emitted from each light diffusing member 100 having a first thickness T of about 1.15 times, about 1.25 times, about 1.3 times, and about 1.35 times the second thickness t is described in the Experimental Example 1 item of Table 1.

In Experimental Example 1, when the first thickness T of the light diffusing member 100 is about 1.15 times the second thickness t, the luminance of the light emitted from the first surface 110 of the light diffusing member 100 is about 12,140 [nit Was. The luminance of the light emitted from the first surface 110 of the light diffusing member 100 having the first thickness T of about 1.15 times the second thickness was increased than the brightness of the light emitted from the light diffusing member of the comparative example.

In Experimental Example 1, when the first thickness T of the light diffusing member 100 is about 1.25 times the second thickness t, the luminance of the light emitted to the first surface 110 of the light diffusing member 100 is about 13,476 [nit] Was. The luminance of the light emitted from the first surface 110 of the light diffusing member 100 having the first thickness T of about 1.25 times the second thickness t was increased than the luminance measured from the light diffusing member of the comparative example.

In Experimental Example 1, when the first thickness T of the light diffusing member 100 is about 1.30 times the second thickness, the luminance of the light emitted from the first surface 110 of the light diffusing member 100 is about 13,720 [nit]. It was. The luminance of the light emitted from the first surface 110 of the light diffusing member 100 having the first thickness T of about 1.30 times the second thickness t was increased than the luminance measured from the light diffusing member of the comparative example.

In Experimental Example 1, when the first thickness T of the light diffusing member 100 is about 1.35 times the second thickness t, the luminance of the light emitted from the first surface 110 of the light diffusing member 100 is about 13,980 [nit] Was. The luminance of the light emitted from the first surface 110 of the light diffusing member 100 having the first thickness T of about 1.35 times the second thickness t was increased than the luminance measured from the light diffusing member of the comparative example.

According to Experimental Example 1, when the first thickness T is about 1.15 times to about 1.35 times the second thickness t, the luminance of the light emitted to the first surface 110 of the light diffusing member 100 increases than that of the comparative example. It became.

Experimental Example 2

The light diffusing member of the comparative example has the same first thickness T and second thickness t. The brightness of light emitted from the light diffusing member having the same first thickness T and second thickness t was about 11,500 [nit].

The luminance of light emitted from the light diffusing members 100 having the first thickness T of about 1.40 times, about 1.45 times, about 1.50 times, and about 1.55 times the second thickness t is described in the Experimental Example 2 item of Table 1.

In Experimental Example 2, when the first thickness T of the light diffusing member 100 is about 1.40 times the second thickness t, the luminance of the light emitted from the first surface 110 of the light diffusing member 100 is about 14,050 [nit Was. The luminance of the light emitted from the first surface 110 of the light diffusing member 100 having the first thickness T of about 1.40 times the second thickness t was increased than the brightness of the light emitted from the light diffusing member of the comparative example.

In Experimental Example 2, when the first thickness T of the light diffusing member 100 is about 1.45 times the second thickness t, the luminance of the light emitted from the first surface 110 of the light diffusing member 100 is about 14,080 [nit Was. The luminance of light emitted from the first surface 110 of the light diffusing member 100 having the first thickness T of about 1.45 times the second thickness was increased than the luminance of the light emitted from the light diffusing member of the comparative example.

In Experimental Example 2, when the first thickness T of the light diffusing member 100 is about 1.50 times the second thickness, the luminance of the light emitted from the first surface 110 of the light diffusing member 100 is about 14,130 [nit]. It was. The luminance of the light emitted from the first surface 110 of the light diffusing member 100 having the first thickness T of about 1.50 times the second thickness t was increased than that of the light emitted from the light diffusing member according to the comparative example.

In Experimental Example 2, when the first thickness T of the light diffusing member 100 is about 1.55 times the second thickness, the luminance of the light emitted from the first surface 110 of the light diffusing member 100 is about 14,220 [nit]. It was. The brightness of light emitted from the first surface 110 of the light diffusing member 100 having the first thickness T of about 1.55 times the second thickness t was increased than the brightness of the light emitted from the light diffusing member according to the comparative example.

According to Experiment 2, when the first thickness T is about 1.40 times to about 1.55 times the second thickness t, the luminance of the light emitted from the first surface 110 of the light diffusing member 100 increases than that of the comparative example. It became.

Experimental Example 3

The light diffusing member of the comparative example has the same first thickness T and second thickness t. The brightness of light emitted from the light diffusing member having the same first thickness T and second thickness t was about 11,500 [nit].

The luminance of the light emitted from the light diffusing members 100 having the first thickness T of about 1.60 times and about 1.67 times the second thickness is described in the Experimental Example 3 item of Table 1.

In Experimental Example 3, when the first thickness T of the light diffusing member 100 is about 1.60 times the second thickness t, the luminance of the light emitted from the first surface 110 of the light diffusing member 100 is about 14,440 [nit Was. The luminance of the light emitted from the first surface 110 of the light diffusing member 100 having the first thickness T of about 1.60 times the second thickness t was increased than the brightness of the light emitted from the light diffusing member of the comparative example.

In Experiment 3, when the first thickness T of the light diffusing member 100 is about 1.67 times the second thickness t, the luminance of the light emitted from the first surface 110 of the light diffusing member 100 is about 14,500 [ nit]. The brightness of light emitted from the first surface 110 of the light diffusing member 100 having the first thickness T of about 1.67 times the second thickness t was increased than the brightness of the light emitted from the light diffusing member according to the comparative example.

According to Experiment 3, when the first thickness T is about 1.60 times to about 1.67 times the second thickness t, the luminance of the light emitted from the first surface 110 of the light diffusing member 100 increases than that of the comparative example. It became.

Alternatively, when the first thickness T of the light diffusing member 200 is about 2.0 times the second thickness t, the luminance of the light emitted from the light diffusing member 100 is the luminance of the light emitted from the light diffusing member according to the comparative example. Somewhat higher than

Experimental Example 4

The light diffusing member of the comparative example has the same first thickness T and second thickness t. The brightness of light emitted from the light diffusing member having the same first thickness T and second thickness t was about 11,500 [nit].

The luminance of the light emitted from the light diffusing members 100 having the first thickness T of about 1.70 times the second thickness is described in the Experimental Example 4 item of Table 1.

In Experimental Example 4, when the first thickness T of the light diffusing member 100 is 1.70 times the second thickness t, the luminance of light emitted from the first surface 110 of the light diffusing member 100 is about 13,400 [nit]. It was. The luminance of the light emitted from the first surface 110 of the light diffusing member 100 having the first thickness T of about 1.70 times the second thickness t was increased than the brightness of the light emitted from the light diffusing member according to the comparative example.

However, when the first thickness T of the light diffusing members 100 according to Experimental Example 4 is increased by 1.70 times or more of the second thickness t, the luminance of the light emitted from the light diffusing member 100 starts to decrease.

Referring to Experimental Examples 1 to 4, the brightness of light emitted from the light diffusing member is increased or decreased by the first thickness T and the second thickness t, and preferably, the first thickness T of the light diffusing member is When the thickness is about 1.15 times to about 1.80 times, the luminance is increased compared to the light diffusing member where the first thickness T and the second thickness t are the same.

Referring to Table 1 and FIG. 3, the luminance of the light emitted from the first surface 110 of the light diffusing member 100 is best when the first thickness T of the light diffusing member 100 is about 1.67 times the second thickness t. high.

In addition, the present embodiment provides a formula for calculating the brightness of the light diffusing member including the optical portion having the ridges and valleys.

The data needed to calculate the equations include the ramp interval D, the height H between the lamp and the light diffusing member 100, the curvature R of the floor, the curvature r of the groove, r It is the thickness T between one side 110. Table 2 shows various conditions of the light diffusing member for calculating the formula.

number D (mm) H (mm) R (mm) r (mm) T (mm) Luminance (nit) Uniformity (%) One 20 11.8 0.5 0.5 2 14200 77 2 30 11.8 0.5 0.5 One 13200 69 3 20 17.6 0.5 0.5 One 13420 78 4 30 17.6 0.5 0.5 2 12800 76 5 20 11.8 One 0.5 One 12980 87 6 30 11.8 One 0.5 2 13200 92 7 20 17.6 One 0.5 2 12600 90 8 30 17.6 One 0.5 One 12900 85 9 20 11.8 0.5 One One 13600 88 10 30 11.8 0.5 One 2 13100 81 11 20 17.6 0.5 One 2 13000 86 12 30 17.6 0.5 One One 13300 84 13 20 11.8 One One 2 13350 81 14 30 11.8 One One One 13450 72 15 20 17.6 One One One 12700 77 16 30 17.6 One One 2 12300 79

※ In Table 2, luminance and uniformity are experimental data measured by experiment.

The data in Table 2 is analyzed by statistical analysis software, whereby the brightness of the light diffusing member is predicted. In this embodiment, the statistical analysis software, for example, Minitab (trade name), which is statistical software, can be used, and the accuracy of the luminance of the light emitted from the light diffusing member 100 is 95% or more.

 Statistical analysis software calculates total coefficients, ramp interval coefficients, height coefficients, floor curvature coefficients, groove curvature coefficients and thickness coefficients that affect brightness. In this embodiment, the total coefficient calculated by the statistical analysis software is 15787.5, the calculated ramp interval coefficient is -20.0, the calculated height coefficient is -87.5, the calculated floor curvature coefficient is -785.0, and the calculated The curvature coefficient of the groove is -125.0 and the calculated thickness coefficient is -125.

Luminance (nit) = 15787.5-20D-87.5H-785R-125r-125T

According to Equation 1, the first surface of the light diffusing member with an accuracy of 95% or more only by the distance between the lamps, the height between the light diffusing member and the lamp, the curvature of the floor, the curvature of the groove and the thickness between the floor and the first surface. The luminance of the light emitted from 110 can be calculated.

On the other hand, by analyzing the data of Table 2 by statistical analysis software, it is possible to predict the luminance uniformity of the light emitted from the first surface 110 of the light diffusing member 100. In this case, the statistical analysis software, for example, Minitab, which is statistical software, may be used, and the accuracy of the analyzed luminance uniformity is 95% or more.

 Statistical analysis software calculates overall coefficients, ramp interval coefficients, height coefficients, floor curvature coefficients, groove curvature coefficients and thickness coefficients that affect luminance uniformity. In this embodiment, the total coefficient calculated by the statistical analysis software is 43.47, the calculated ramp interval coefficient is -0.325, the calculated height coefficient is 0.172, the calculated floor curvature coefficient is 54, and the calculated grooves The curvature factor is 61.5 and the calculated thickness factor is 4.75.

Luminance Uniformity (%) = 43.47-0.325D + 0.172H + 54R + 61.5r-4.75T

According to Equation 2, the distance between the lamps, the height between the light diffusing member and the lamp, the curvature of the floor, the curvature of the groove and the thickness between the floor and the first surface alone of the light diffusing member 100 with an accuracy of 95% or more. The luminance uniformity of the light emitted from the first surface 110 may be calculated.                     

4 is a graph of luminance and luminance uniformity analyzed by a statistical analysis program.

Referring to Table 2 and Figure 4, in order to increase the brightness and brightness uniformity, the distance between the lamp is about 20 mm, the distance between the light diffusing member and the center of the lamp is about 11.8 mm, the curvature of the floor of the light diffusing member is about 1.0 mm , The curvature of the groove is preferably about 0.5 mm and the thickness of the floor and the first surface is about 2.0 mm. At this time, the luminance of the light diffusion member is, for example, 13,260 [nit], and the luminance uniformity is, for example, about 92.25%.

Example 2

5 is a cross-sectional view of the light diffusing member according to the second embodiment of the present invention. The light diffusing member according to the second embodiment of the present invention is the same as the light diffusing member of Example 1 except for the coupling groove. Therefore, the same members are denoted by the same reference numerals as those in the first embodiment, and duplicated descriptions thereof will be omitted.

Referring to FIG. 5, the light diffusing member 100 may be hardly fixed to a position designated by the ridge 134 and the groove 132 alternately formed on the second surface 120 of the light diffusing member 100.

In order to fix the light diffusing member 100 to a designated position, a coupling groove 122 may be formed in the second surface 120 of the light diffusing member 100. The coupling groove 122 is coupled to a coupling protrusion (not shown) protruding from a member (not shown) facing the second surface 120, and thus the light diffusion member 100 may be fixed at a designated position. At least two joining grooves 122 formed in the light diffusing member 100 may be provided.

Example 3

6 is a cross-sectional view of the light diffusing member according to the third embodiment of the present invention. The light diffusing member according to the third embodiment of the present invention is the same as the light diffusing member of Example 1 except for the engaging projection. Therefore, the same members are denoted by the same reference numerals as those in the first embodiment, and duplicated descriptions thereof will be omitted.

Referring to FIG. 6, the light diffusing member 100 may be hardly fixed to a position designated by the ridge 134 and the groove 132 alternately formed on the second surface 120 of the light diffusing member 100.

In order to fix the light diffusing member 100 to a designated position, a coupling protrusion 124 may be formed on the second surface 120 of the light diffusing member 100. The coupling protrusion 124 is coupled to a coupling groove (not shown) formed in a member (not shown) facing the second surface 120, and thus the light diffusion member 100 may be firmly fixed at a designated position. . At least two coupling protrusions 124 formed on the light diffusing member 100 may be provided.

Example 4

7 is a cross-sectional view of the light diffusing member according to the fourth embodiment of the present invention. The light diffusing member according to the fourth embodiment of the present invention is the same as the light diffusing member of Example 1 except for the light diffusing layer. Therefore, the same members are denoted by the same reference numerals as those in the first embodiment, and duplicated descriptions thereof will be omitted.

Referring to FIG. 7, a light diffusion layer 140 is formed on the first surface 110 of the light diffusion member 100. The light diffusion layer 140 includes a binder 142 having a first light refractive index and a light diffusion bead 144 having a second light refractive index.

The binder 142 fixes the light diffusing beads 144 on the first surface 110 of the light diffusing member 100. Examples of the material forming the binder 142 include polyethylene terephthalate (PET).

The light diffusing beads 144 are fixed on the first surface 110 by the binder 142. The light diffusion beads 144 may have a spherical shape, for example, and examples of the material forming the binder 142 include polymethyl methacrylate.

The light diffusion layer 140 including the binder 142 and the light diffusion beads 144 diffuses the light passing through the light diffusion member 100 again to provide more luminance and luminance uniformity of the light passing through the light diffusion member 100. Improve.

Backlight assembly

Example 5

8 is a conceptual diagram conceptually illustrating a backlight assembly according to a fifth embodiment of the present invention.

Referring to FIG. 8, the backlight assembly 500 includes a diffusion member 200 and a light source 300 that provides light to the diffusion member 200.                     

The diffusion member 200 is disposed to face the light source 300 and diffuses the light generated by the light source 300. The diffusion member 200 has a first surface 210 and a second surface 220 facing the first surface 210 from which the diffused light is emitted.

In this embodiment, the first surface 210 of the diffusion member 200 is a flat surface, and the second surface 220 is a groove and a floor to improve the brightness of the light generated from the light source 300 and the brightness uniformity of the light. Has an alternating wave shape.

In this embodiment, groove 232 has a radius of curvature r. The radius of curvature r of the inner surface of the groove 232 is about 0.5 mm to 1 mm.

Floors 234 are connected to both sides of groove 232, and floor 232 has a radius of curvature R. Preferably the radius of curvature R of the floor is about 0.5 mm to 1 mm. The ridge 234 and the groove 232 have a semicircular cylinder shape when viewed in plan.

In this embodiment, in order to increase the luminance of the light generated by the light source 300 and the luminance uniformity of the light by the second surface 220 having the groove 232 and the ridge 234, the first surface 210 and The first thickness T of the floor 234 and the second thickness t of the first surface 210 and the groove 232 are precisely adjusted.

In order to increase the luminance of the light generated by the light source 300 and the luminance uniformity of the light, the first thickness T is preferably 1.15 times to 1.80 times the second thickness t. Alternatively, the first thickness T may be 1.15 to 1.35 times the second thickness t. Alternatively, the first thickness T is preferably 1.35 to 1.55 times the second thickness t. Alternatively, the first thickness T is preferably 1.55 to 1.67 times the second thickness t. Alternatively, the first thickness T is preferably 1.67 to 1.75 times the second thickness t. Alternatively, the first thickness T is preferably 1.67 times the second thickness t.

The light source 300 preferably has a cylindrical shape, a U shape or a C shape. In the present embodiment, the light source 300 may be an internal electrode cold cathode ray tube lamp having an electrode disposed therein or an external electrode cold cathode ray tube lamp having an electrode disposed outside.

9 is an exploded perspective view illustrating in detail the backlight assembly illustrated in FIG. 8. FIG. 10 is an enlarged view of a portion 'A' of the backlight assembly shown in FIG. 9.

8 to 10, the backlight assembly 500 may further include a diffusion member 200 having a ridge 234 and a groove 232, and a receiving container 320 for receiving the light source 300. have.

The storage container 320 has a bottom surface 321 and sidewalls 323 extending from an edge of the bottom surface 321, and a diffusion member is formed on the storage container 320 by the bottom surface 321 and the sidewalls 323. An accommodation space for accommodating the light source 300 and the light source 300 is formed.

The backlight assembly 500 according to the present embodiment may further include an inverter 400. Inverter 400 is preferably disposed on the outer surface of the bottom surface 321 of the storage container (300). Inverter 400 provides driving power required to generate light from each light source 300 to the light source 300.

The backlight assembly 500 according to the present embodiment may further include a shield case 520. The shield case 420 covers the inverter 400 to remove harmful electromagnetic waves generated from the inverter 400 disposed on the outer surface of the bottom surface 321. Shield case 420 is coupled to the outer surface of the bottom surface 321.

The backlight assembly 500 according to the present embodiment may further include a reflector plate 330. The reflection plate 330 is interposed between the bottom surface 321 of the storage container 300 and the light source 300. Preferably, the reflective plate 330 is disposed on the bottom surface 321 of the storage container 300. The reflector 321 reflects the light toward the bottom surface 321 of the light generated from the light source 300 toward the diffusion member 200, and as a result, the light incident on the second surface 220 of the diffusion member 200. The amount of light is increased.

In addition, the backlight assembly 500 according to the present embodiment may further include a light source supporter 350. The light source supporter 350 fixes the plurality of light sources 300 to the inside of the storage container 300. The light source supporter 350 coupled with the light sources 300 is fixed to the storage container 300.

In addition, the backlight assembly 500 according to the present exemplary embodiment may cover both ends of the light source 300, and further include a fixing frame 360 for fixing the diffusion member 200.

In order to prevent the diffusion member 200 from moving inside the receiving container 300, a coupling groove is formed in the diffusion member 200, the coupling frame coupled to the coupling groove of the diffusion member 200 in the fixed frame 360 Protrusion 366 may be formed. Alternatively, a coupling protrusion may be formed in the diffusion member 200, and a coupling groove coupled to the coupling protrusion of the diffusion member 200 may be formed in the fixing frame 360.

In addition, an optical sheet such as a diffusion sheet may be additionally disposed on the fixed frame 360. In order to fix the optical sheet at a designated position, a boss fixing boss 365 for fixing the optical sheet may be further formed on an upper surface of the coupling protrusion 365 formed on the fixing frame 360.

The diffusion member 200 has a fixing groove 280 is formed to be fixed to the upper surface of the fixing frame 360, the fixing frame 360 may further include a fixing projection 365 fitted into the fixing groove 280. have.

Preferably, a diffusion sheet 370 may be disposed on the upper surface of the diffusion member 200 to diffuse the light passing through the first surface 210 of the diffusion member 200 again. The prism sheet 380 may be disposed on the top surface of the diffusion sheet 370 to increase the front luminance of the light passing through the diffusion sheet 370. Optionally, a reflective polarizing sheet 390 may be disposed on the upper surface of the prism sheet 380 to further improve the luminance of the light passing through the prism sheet 380.

In the present embodiment, the backlight assembly 500 may further include a middle mold frame 430. The middle mold frame 430 is coupled to the receiving container 300 to prevent the flow of the diffusion member 200. The middle mold frame 430 may be formed of at least two according to the size of the display device.

The panel guide member 440 may be disposed on the top surface of the middle mold frame 430 to guide the edge of the display panel. The panel guide member 440 may have an L shape, for example, and the panel guide member 440 is preferably an elastic member having elasticity.

Display

Example 6

11 is a conceptual diagram of a display device according to a sixth embodiment of the present invention.

Referring to FIG. 11, the display device 1000 includes a backlight assembly 700 and a display panel 800.

The backlight assembly 700 includes a diffuser plate 710 and a lamp 720 that provides light to the diffuser plate 710.

The diffusion plate 710 is disposed to face the lamp 720 and diffuses the light generated by the lamp 720. The diffusion plate 710 has a light exit surface 711 through which the diffused light is emitted and a light incident surface 712 facing the light exit surface 711. The light incident surface 712 is disposed to face the lamp 720.

In the present embodiment, the light exit surface 711 of the diffuser plate 710 is a flat surface, the light incident surface 712 is a groove 713 to improve the brightness of the light generated by the lamp 720 and the brightness uniformity of the light. ) And the groove 713 has a semicircular cylinder shape formed with the floor 714.

In this embodiment, groove 713 has a radius of curvature r. The radius of curvature r of the inner surface of the groove 713 is about 0.5 mm to 1 mm.

The floor 714 is formed on both sides of the groove 713, and the floor 714 has a radius of curvature R. Preferably, the radius of curvature R of the floor 714 is about 0.5 mm to 1 mm.

In this embodiment, in order to increase the luminance of the light passing through the light exit surface 711 and the brightness uniformity of the light by the light incident surface 712 having the groove 713 and the ridge 714, the light exit surface 711 ) And the first thickness T of the floor 714 and the second thickness t of the light exit surface 711 and the groove 713 are precisely adjusted.

In order to increase the luminance of the light passing through the light exit surface 711 and the luminance uniformity of the light, the first thickness T is preferably 1.15 times to 1.80 times the second thickness t. Alternatively, the first thickness T may be 1.15 to 1.35 times the second thickness t. Alternatively, the first thickness T is preferably 1.35 to 1.55 times the second thickness t. Alternatively, the first thickness T is preferably 1.55 to 1.67 times the second thickness t. Alternatively, the first thickness T is preferably 1.67 to 1.75 times the second thickness t. Alternatively, the first thickness T is preferably 1.67 times the second thickness t.

The lamp 720 preferably has a cylindrical shape, a U shape or a C shape. In the present embodiment, the lamp 300 may use an internal electrode cold cathode ray tube lamp having an electrode disposed therein or an external electrode cold cathode ray tube lamp having an electrode disposed outside.

The lamp 720 is disposed to face the ridges 714 of the light incident surface 712 of the diffuser plate 710.

The display panel 800 is disposed to face the light exit surface 711 of the diffuser plate 710, and the display panel 800 displays an image based on the light passing through the light exit surface 711.

FIG. 12 is an exploded perspective view illustrating the backlight assembly illustrated in FIG. 11 in detail.

11 and 12, the backlight assembly 700 may further include an accommodation container 730 for accommodating the diffusion plate 710 and the lamp 720.

The storage container 730 has a bottom surface 731 and sidewalls 732 extending from an edge of the bottom surface 731, and a diffusion plate is formed on the storage container 730 by the bottom surface 731 and the sidewall 732. 710 and an accommodating space for accommodating the lamp 720 are formed.

The backlight assembly 700 according to the present embodiment may further include an inverter 740. Inverter 740 is preferably disposed on the outer surface of the bottom surface 731 of the storage container 730, and provides the driving power required to generate light to each lamp (720).

The backlight assembly 700 according to the present embodiment may further include a shield case 750. The shield case 750 covers the inverter 740 to remove harmful electromagnetic waves generated from the inverter 740 disposed on the outer surface of the bottom surface 731, and the shield case 750 is an outer surface of the bottom surface 731. Is coupled to.

The backlight assembly 700 according to the present embodiment may further include a reflecting plate 760. The reflective plate 760 is disposed between the bottom surface 731 of the storage container 730 and the lamp 720. Preferably, the reflecting plate 760 is disposed on the bottom surface 731 of the storage container 730. The reflection plate 760 reflects the light toward the bottom surface 731 among the light generated by the lamp 720 toward the diffusion plate 710 to increase the amount of light incident on the light incident surface of the diffusion plate 710.

In addition, the backlight assembly 700 according to the present embodiment may further include a light source supporter 770. The light source supporter 770 fixes the plurality of lamps 720 inside the storage container 730. The light source supporter 770 coupled with the lamps 720 is fixed to the storage container 730.                     

In addition, the backlight assembly 700 according to the present exemplary embodiment may further include a fixing frame 780 that covers both ends of the lamp 720 and the diffusion plate 710 is disposed on an upper surface thereof.

In order to prevent the diffusion plate 710 from moving inside the receiving container 730, a coupling groove is formed in the diffusion plate 710, the coupling frame coupled to the coupling groove of the diffusion plate 710 in the fixed frame 780. Protuberances may be formed. Alternatively, a coupling protrusion may be formed in the diffusion plate 710, and a coupling groove coupled to the coupling protrusion of the diffusion plate 710 may be formed in the fixing frame 780.

In addition, an optical sheet such as a diffusion sheet may be additionally disposed on the fixed frame 780. In order to fix the optical sheet at a designated position, a boss-like fixing protrusion 785 for fixing the optical sheet may be further formed on an upper surface of the coupling protrusion 715 formed on the fixing frame 780.

Preferably, a diffusion sheet 790 may be disposed on the upper surface of the diffusion plate 710 to diffuse the light passing through the diffusion plate 710 again. A prism sheet 792 may be disposed on the top surface of the diffusion sheet 790 to increase the front luminance of the light passing through the diffusion sheet 790. Optionally, a reflective polarizing sheet 794 may be disposed on the upper surface of the prism sheet 792 to further improve the luminance of the light passing through the prism sheet 792.

In the present embodiment, the backlight assembly 700 may further include a middle mold frame 796. The middle mold frame 796 is coupled to the receiving container 730 to prevent the diffusion plate 710 from flowing. The panel guide member 798 for guiding the edge of the display panel may be disposed on the top surface of the middle mold frame 796. The panel guide member 798 is preferably an elastic member having elasticity.

The display panel 800 is disposed on the middle mold frame 796 and guided by the panel guide member 798.

The display panel 800 may include a thin film transistor substrate 810, a color filter substrate 820, and a liquid crystal layer 830.

The thin film transistor substrate 810 includes a plurality of pixel electrodes arranged in a matrix form and a thin film transistor connected to each pixel electrode to provide a driving voltage to the pixel electrodes. In this embodiment, examples of the material constituting the pixel electrode include indium tin oxide (ITO), indium zinc oxide (IZO), amorphous indium tin oxide (a-ITO), and the like. Can be mentioned.

The color filter substrate 820 is disposed to face the thin film transistor substrate 810 and includes a common electrode facing the pixel electrode. The common electrode is formed over the entire surface of the color filter substrate 820. Examples of the material forming the common electrode include indium tin oxide (ITO), indium zinc oxide (IZO), and amorphous tin oxide (indium tin oxide). amorphous Indium Tin Oxide, a-ITO), and the like.

The liquid crystal layer 830 is interposed between the thin film transistor substrate 810 and the color filter substrate 820, and the arrangement of the liquid crystal layer 830 is changed to correspond to the intensity of the electric field formed between the common electrode and the pixel electrode. The transmittance of light passing through the diffuser plate is changed.

 As described in detail above, the structure of the light diffusing member for diffusing the light is changed to further improve the brightness and brightness uniformity of the light, thereby improving the display quality of the image generated from the display device.

In the detailed description of the present invention described above with reference to a preferred embodiment of the present invention, those skilled in the art or those skilled in the art having ordinary knowledge in the scope of the invention described in the claims to be described later It will be understood that various modifications and variations can be made in the present invention without departing from the scope of the present invention.

Claims (38)

First side; A second face facing the first face; And At least one groove formed on the second surface and a floor connected to the groove, wherein the first thickness between the floor and the first surface is 1.15 to 1.80 times the second thickness between the groove and the first surface. A light diffusing member comprising a light diffusing portion. The light diffusing member according to claim 1, wherein the first thickness is 1.15 to 1.35 times the second thickness. The light diffusing member according to claim 1, wherein the first thickness is 1.35 to 1.55 times the second thickness. The light diffusing member according to claim 1, wherein the first thickness is 1.55 to 1.67 times the second thickness. The light diffusing member according to claim 1, wherein the first thickness is 1.67 to 1.75 times the second thickness. The light diffusing member according to claim 1, wherein the first thickness is 1.67 times the second thickness. The light diffusing member according to claim 1, wherein the second thickness is 1.5 mm to 2.0 mm. The light diffusing member according to claim 1, wherein the floor has a semicircular cylinder shape. The light diffusing member according to claim 1, wherein the optical portion is made of a polymethylmethyl acrylate material. The light diffusing member of claim 1, wherein at least one coupling groove is formed at an edge of the second surface. The light diffusing member of claim 1, wherein at least one coupling protrusion is formed at an edge of the second surface. The light diffusing member according to claim 1, wherein the curvature of the floor is 0.5 to 1 mm. The light diffusing member according to claim 1, wherein the groove has a curvature of 0.5 to 1 mm. 2. The light diffusing member according to claim 1, wherein a diffusion layer comprising diffusion beads for diffusing the light having passed through the first surface and a binder for fixing the diffusion beads is formed on the first surface. 15. The light diffusing member according to claim 14, wherein the diffusing beads are made of polymethmethylacrylate and the binder is made of polyethylene terephthalate. A first surface on which light is emitted, a second surface facing the first surface, at least one groove formed on the second surface and a floor connected to the groove, the floor and the first surface; A light diffusing member including a light diffusing portion having a first thickness between the surfaces of 1.15 to 1.80 times the second thickness between the groove and the first surface; And And a light source disposed to face the second surface and disposed at a portion corresponding to the floor to generate light. 17. The backlight assembly of claim 16, wherein the first thickness is 1.15 to 1.35 times the second thickness. The backlight assembly of claim 16, wherein the first thickness is 1.35 to 1.55 times the second thickness. The backlight assembly of claim 16, wherein the first thickness is 1.55 to 1.67 times the second thickness. The backlight assembly of claim 16, wherein the first thickness is 1.67 to 1.75 times the second thickness. 17. The backlight assembly of claim 16, wherein the first thickness is 1.67 times the second thickness. The backlight assembly of claim 16, wherein the second thickness is 1.5 mm to 2.0 mm. 17. The backlight assembly of claim 16, wherein the light diffusing portion has a semicircular cylinder shape. 17. The backlight assembly of claim 16, wherein the light diffusing portion is made of a polymethylmethylacrylate material. The backlight assembly according to claim 16, wherein the light source is a cold cathode ray tube lamp having a cylindrical shape. 27. The backlight assembly of claim 25, wherein the cold cathode ray tube lamp is disposed in parallel with the light diffusion portion. 17. The backlight assembly of claim 16, wherein a diffusion sheet is disposed on the first surface. The backlight assembly of claim 16, wherein a light diffusion layer is formed on the first surface. 29. The backlight assembly of claim 28, wherein the diffusion beads comprise polymethmethylacrylate and the binder comprises polyethylene terephthalate. The backlight assembly of claim 16, wherein the diffusion member and the light source are accommodated in a storage container, and a fixing frame for fixing the diffusion member is disposed in the storage container. 31. The backlight assembly of claim 30, wherein a coupling protrusion is formed in the fixing frame, and a coupling groove is formed in the diffusion member corresponding to the coupling protrusion. 31. The backlight assembly of claim 30, wherein a coupling groove is formed in the fixing frame facing the diffusion member, and a coupling protrusion is formed in the diffusion member corresponding to the coupling groove. A light exit surface, a light incident surface facing the light exit surface, and at least one groove formed on the light exit surface and a floor connected to the groove, wherein a first thickness between the floor and the light exit surface is And a light diffusion pattern having a thickness of 1.15 to 1.80 times the second thickness between the light exit surfaces. And A lamp disposed to face the light incident surface and disposed at a portion corresponding to the floor to generate light; And And a display panel for generating an image based on the diffused light passing through the light exit surface. The display device of claim 33, wherein the diffusion plate and the lamp are housed in a storage container, and a fixing frame for fixing the diffusion plate is disposed in the storage container. 34. The display device according to claim 33, wherein the fixing frame is provided with a coupling part for coupling with the diffusion plate. 36. The display device of claim 35, wherein the coupling portion is a coupling groove. 36. The display device of claim 35, wherein the coupling portion is a coupling protrusion. 36. The display device according to claim 35, wherein a fixing protrusion for fixing the diffusion plate to a designated position is formed on an upper surface of the fixing frame, and a fixing groove into which the fixing protrusion is fitted is formed in the diffusion plate.

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