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Light diffusion member, back light assembly including the same and display device including the same

a technology of light diffusion member and back light assembly, which is applied in the direction of lighting and heating apparatus, instruments, transportation and packaging, etc., can solve the problems of generating luminance loss and affecting the base matrix material of the pet, and achieve the effect of preventing the wrinkling phenomenon reducing the manufacturing cost of the liquid crystal display device, and improving the light luminance and light diffusing efficiency of the light diffusion member

Inactive Publication Date: 2006-06-22
SAMSUNG ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0012] The present invention provides a light diffusion member providing an improved light luminance and an improved light diffusing efficiency, preventing a wrinkling phenomenon, and reducing the manufacturing cost.
[0026] According to the light diffusion member of the present invention, a light luminance and a light diffusing efficiency of a liquid crystal display device including the light diffusion member can be improved and a wrinkling phenomenon of the light diffusion member may be prevented. In addition, the manufacturing cost of the liquid crystal display device may be reduced.

Problems solved by technology

However, the PET based material of the base matrix is affected when the diffusion plate is deformed.
In addition, the light diffusion member including the diffusion plate and the diffusion sheet according to the conventional method might generate luminance loss due to an air gap present between the diffusion plate and the diffusion sheet.

Method used

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  • Light diffusion member, back light assembly including the same and display device including the same
  • Light diffusion member, back light assembly including the same and display device including the same
  • Light diffusion member, back light assembly including the same and display device including the same

Examples

Experimental program
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Effect test

embodiment 1

[0037]FIG. 1 is a schematic cross-sectional view showing an exemplary embodiment of a light diffusion member according to the present invention.

[0038] Referring to FIG. 1, a light diffusion member 100 includes a light diffusing body 10 and a light diffusing layer 20 formed on the light diffusing body 10. The light diffusion member 100 diffuses incident light from a light source 50 through a light exiting surface of the light diffusing body 10, where the light exiting surface may be a layer of the light diffusing body 10, or may simply be the outermost surface of the light diffusing body 10 that faces the light diffusing layer 20. The light diffusion member 100 includes a polymer mixture obtained by uniformly blending a first polymer and a second polymer.

[0039] Through the blending, two or more polymers having different physical properties are uniformly mixed in a predetermined mixing ratio. A complex material having a novel physical property can be prepared through the blending pr...

example 1

Manufacture of PET / PC Light Diffusing Body

[0053] 0.4 ton of chip-shaped PET and 1.6 ton of PC were put into a blending apparatus, a twin screw extruder manufactured by Killon Co., Ltd. The PET and PC were then blended at a temperature of 280° C. Then, the blended product was extruded, allowed to pass through a T-die, and then cooled in a cooling apparatus to a temperature of 30° C. The extruded and cooled light diffusing body was transported on a roll and cut to a desired size.

embodiment 2

[0054] The light diffusion member 100 according to this present embodiment includes the same components described in Embodiment 1 except utilizes a different arrangement for the light diffusing body 10. Therefore, the same reference numerals are given to the same components and repeated explanation will be omitted.

[0055] The light diffusion member 100 according to this embodiment includes a copolymer within the light diffusing body 10 having the first and the second polymers arranged as repeating units. That is, for example, instead of blending the first and second polymers to form a polymer mixture as in Embodiment 1, at least one layer of the first polymer and at least one layer of the second polymer form the light diffusing body 10. The copolymer exhibits an improved stability or uniformity of physical properties such as glass transition temperature and humidity absorbance, when compared with the polymer mixture prepared by Example 1.

[0056] The second polymer preferably has a h...

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Abstract

The light diffusion member includes a light diffusing body and a light diffusing layer. The light diffusing body includes a polymer mixture obtained by uniformly blending a first polymer having a first glass transition temperature and a second polymer having a second transition temperature higher than the first transition temperature. Alternatively, the light diffusing body includes a copolymer prepared from the first and the second polymer. The light diffusing body diffuses an incident light through a light exiting surface. The light diffusing layer is formed on the light exiting surface of the light diffusing body and includes a binder resin having beads. A back light assembly including the light diffusion member and a liquid crystal display device including the light diffusion member exhibit an improved luminance and an improved light diffusing efficiency.

Description

[0001] This application claims priority to Korean Patent Application No. 2004-90109, filed on Nov. 6, 2004 and all the benefits accruing therefrom under 35 U.S.C. §119, and the contents of which in its entirety are herein incorporated by reference. BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The present invention relates to a light diffusion member, a back light assembly including the same, a display device including the same, and a copolymer for the light diffusion member. More particularly, the present invention relates to a light diffusion member exhibiting an improved light luminance and an improved light diffusing efficiency with a reduced manufacturing cost, a back light assembly including the same, and a display device including the same. [0004] 2. Description of the Related Art [0005] Generally, a display device transforms data having electric signals after being processed by an information processing unit into an image. A liquid crystal display devic...

Claims

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Application Information

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IPC IPC(8): F21V7/04
CPCG02B5/0226G02B5/0242G02B5/0278Y10T428/1086G02F1/133611G02F2001/133317Y10T428/26G02F1/133606Y10T428/31507Y10T428/31786C09K2323/06G02F1/133317G02F1/1335
Inventor KIM, GEUN-HYUNGPARK, JONG-DAEKIM, TAE-SEOK
Owner SAMSUNG ELECTRONICS CO LTD
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