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Optical diffusion membrane

A technology of optical diffusion and main diffusion, applied in the field of optical diffuser film, can solve the problems of scratches, pollution, and detachment of diffusing agent microbeads on the optical diffuser film, and achieve good antistatic properties, good scratch resistance, and sufficient optical diffusion. sexual effect

Active Publication Date: 2009-12-16
CHINA LUCKY FILM CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, in the existing optical diffusion film, problems such as the adhesion of the diffusing agent, the scratch resistance of the film surface and the antistatic property of the film surface need to be improved during use, especially in the process of processing, the optical diffusion film is relatively prone to damage Scratches, falling off of diffusing agent beads, electrostatic adsorption of impurities, etc.

Method used

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  • Optical diffusion membrane
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Preparation of main diffusion layer coating solution:

[0032] 200 parts of toluene, 50 parts of butanone,

[0033] Acrylic resin microbeads (GM-1407S, product of Kangci Chemical Co., Ltd., particle size 14 microns) 150 parts,

[0034] Acrylic resin microbeads (GM-0407S, product of Kangci Chemical Co., Ltd., particle size 4 microns) 15 parts,

[0035] Polyacrylate resin binder (WDU-938, 50% solid content, 50 hydroxyl value, DIC company product) 100 parts,

[0036] 7 parts of isocyanate crosslinking agent IPDI (Desmodur I, NCO content 37%, product of Bayer Company),

[0037] The above-mentioned materials were stirred and mixed with a dispersing mixer to obtain a coating solution for the main diffusion layer.

[0038] Preparation of back diffusion layer coating solution:

[0039] 150 parts of toluene, 150 parts of butanone,

[0040] Acrylic resin micro-beads (GM-0407S, product of Kangci Chemical Co., Ltd., particle size 4 microns) 5 parts,

[0041] Acrylic adhesive (W...

Embodiment 2

[0047] Preparation of main diffusion layer coating solution:

[0048] 200 parts of toluene, 50 parts of butanone,

[0049] Acrylic resin microbeads (GM-2007S, product of Kangci Chemical Co., Ltd., particle size 20 microns) 150 parts,

[0050] Acrylic resin microbeads (GM-0407S, product of Kangci Chemical Co., Ltd., particle size 4 microns) 20 parts,

[0051] Acrylic adhesive (WDU-938, solid content 50%, hydroxyl value 50, DIC company product) 100 parts,

[0052] 7 parts of isocyanate crosslinking agent IPDI (Desmodur I, NCO content 37%, product of Bayer Company),

[0053] The above-mentioned materials were stirred and mixed with a dispersing mixer to obtain a coating solution for the main diffusion layer.

[0054] Preparation of back diffusion layer coating solution:

[0055] 150 parts of toluene, 150 parts of butanone,

[0056] Acrylic resin micro-beads (GM-0407S, product of Kangci Chemical Co., Ltd., particle size 4 microns) 5 parts,

[0057] Acrylic adhesive (WDU-938,...

Embodiment 3

[0063] Use the main diffusion layer coating solution A and the substrate in the above-mentioned Example 1 to coat, dry with hot air to make the dry film thickness about 9 μm, and then apply the back diffusion layer coating in Example 2 on the other side of the substrate. Spread liquid b and dry with hot air to make the dry film thickness about 2 μm. After the coating was completed, thermal aging treatment was carried out at a constant temperature of 40° C. for 48 hours to form an optical diffusion film, and its performance was measured (see Table 1).

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Abstract

The invention discloses an optical diffusion membrane, which comprises a base material, and a main diffusion layer and a back diffusion layer which are formed on two surfaces of the base material. The parts are structurally characterized in that: the main diffusion layer is formed by coating and setting coating fluid containing optical dispersant, adhesive and cross linker on any one surface of the base material; the back diffusion layer is formed by coating and setting coating fluid containing optical dispersant, adhesive, an antistatic agent and cross linker on the other surface of the base material; the optical dispersant is spherical high polymer microspheres; the optical dispersant of the main diffusion layer comprises large granular optical dispersant and small granular optical dispersant, and the weight ratio of the large granular optical dispersant to the small granular optical dispersant is 11:1 to 7:1; and the grain diameter of the optical dispersant of the back diffusion layer is 1 to 5 microns. The optical diffusion membrane has sufficient optical diffusivity, and has good transmittance, good fog degree coordination, good scratch resistance and antistatic property.

Description

technical field [0001] The invention relates to an optical diffusion film used in a backlight module of a flat panel display. Background technique [0002] For a long time, flat panel displays have been widely used in TVs, computer monitors, notebook computers, mobile phones, digital cameras, MP3 players, MP4 players, GPS navigators, etc. The picture light source of these liquid crystal displays or plasma displays is provided by the backlight module, and the requirements for the light source are uniform and high brightness. [0003] The role of the optical diffusion film is to uniformly diffuse the light from a point light source or a line light source into a uniform, high-brightness surface light source through refraction. This optical diffusion film is widely used in backlight modules of flat panel displays such as liquid crystal displays or plasma displays. [0004] The typical structure of the flat panel display backlight module device is: the light is emitted from the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F21V5/08
Inventor 赵保良霍新莉熊跃斌申跃生高青
Owner CHINA LUCKY FILM CORP
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