Light diffuser plate, surface emission light source apparatus and liquid crystal display

A surface-emitting, light-diffusing plate technology, used in mechanical equipment, static indicators, lighting and heating equipment, etc., can solve problems such as annoying noise, light-diffusing plate expansion, etc., to prevent noise and improve brightness.

Inactive Publication Date: 2008-06-11
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, when the power is turned on, the light diffusion plate expands due to temperature rise in the surface emitting light source device, thereby causing annoying noise generation due to the front surface of the frame and the light diffusion plate rubbing against each other.

Method used

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  • Light diffuser plate, surface emission light source apparatus and liquid crystal display
  • Light diffuser plate, surface emission light source apparatus and liquid crystal display
  • Light diffuser plate, surface emission light source apparatus and liquid crystal display

Examples

Experimental program
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Effect test

example

[0136] Examples of the present invention will now be described, however, it should be understood that the present invention is not limited to these examples.

[0137] raw material

[0138] Translucent resin A: styrene resin ("HRM40" manufactured by Toyo Styrene Co., Ltd., refractive index 1.59)

[0139] Translucent resin B: MS resin ("MS200NT" manufactured by Nippon Steel Chemical Co., Ltd., refractive index 1.57, styrene / methyl methacrylate=80 parts by mass / 20 parts by mass)

[0140] Light-diffusing agent A: crosslinked PMMA particles ("Sumipex XClA" manufactured by Sumitomo Chemical Co., Ltd., refractive index 1.49, average particle size by weight 35 μm)

[0141] Light diffusing agent B: crosslinked silicone polymer particles ("Torayfil DY33-719" manufactured by Toray Dow Coming Inc., refractive index 1.42, volume average particle size 2 µm)

[0142] Light diffusing agent C: "KE-P50" manufactured by Nippon Shokubai Co., Ltd. (refractive index 1.43, average particle size 0....

example A1

[0148] Mix 97.0 parts by mass of translucent resin A and 3.0 parts by mass of light diffusing agent masterbatch A in a dry process, and melt and mix the mixture in the first extrusion machine, and provide it to the feed head, the machine The cylinder temperature is set in the range of 190 to 250°C. At the same time the light diffusing agent masterbatch B was melted and mixed in the second extrusion machine, and supplied to the feed block, the cylinder temperature of which machine was set in the range of 190 to 250°C.

[0149] The co-extrusion molding operation is carried out by utilizing a multi-manifold die at an extrusion temperature of 250° C. so that the resin supplied to the feed block by the first extrusion machine can form an intermediate layer (base layer), and The resin supplied to the feedblock by the second extrusion machine may form the skin. These layers are pressed together by polishing rolls and cooled, thereby producing a light-diffusing plate 3 consisting of ...

example A2

[0152] Mix 97.0 parts by mass of translucent resin A and 4.5 parts by mass of light diffusing agent masterbatch A in a dry process, and melt and mix the mixture in the first extrusion machine, and provide it to the feed head, the machine The cylinder temperature is set in the range of 190 to 250°C. At the same time the light diffusing agent masterbatch B was melted and mixed in the second extrusion machine, and supplied to the feed block, the cylinder temperature of which machine was set in the range of 190 to 250°C.

[0153] The co-extrusion molding operation is realized by using multiple multi-pipe dies at an extrusion temperature of 250°C, so that the resin supplied to the feed block by the first extrusion machine can form the middle layer (base layer), and the resin supplied by the second extrusion machine The resin supplied to the feedblock may form the skin. These layers were pressed together by polishing rolls and cooled, thereby producing a light-diffusing plate 3 con...

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Abstract

The present invention provides a light diffuser plate, a surface emission light source apparatus and a liquid crystal display apparatus which are capable of preventing the generation of annoying noise in an area of contact between the light diffuser plate and a lamp box. The present invention relates to a surface emission light source apparatus comprising a plurality of light sources disposed at a distance from each other in a lamp box, that is made of a resin and has an open front side, and a light diffuser plate that is made of a resin and is disposed on the front side of the frame of the lamp box so as to close the opening of the lamp box, wherein at least a part of the back surface of the light diffuser plate that makes contact with the front surface of the frame is formed as a matted surface, the matted surface has an arithmetic mean surface roughness Ra in a range from 0.8 to 15 mum and a mean surface irregularity interval Rsm in a range from 100 to 300 mum.

Description

technical field [0001] The present invention relates to a light diffusion plate, a surface emitting light source device and a liquid crystal display device capable of preventing annoying noise from being generated in a contact area between a light diffusion plate and a light box. [0002] In this specification and claims, the term "arithmetic mean surface roughness Ra" means the arithmetic mean surface roughness Ra measured in accordance with JIS B0601-1994, and the term "mean surface irregularity interval Rsm" means the mean surface roughness Ra measured in accordance with JIS B0601-1994 B0601-1994 Measured average surface irregularity spacing Rsm. Background technique [0003] Known liquid crystal display devices, for example, have a surface-emitting light source device placed as a backlight on the lower surface (rear surface) of a display area consisting of a liquid crystal cell and a pair of polarizers placed on the upper bottom side of the liquid crystal cell. slice co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F21V8/00F21V13/02G02F1/13357G02F1/133G02F1/1335
Inventor 奥尚规井山浩畅
Owner SUMITOMO CHEM CO LTD
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