Method and equipment for manufacturing light guide plate

Patent metadata

Field	Value
Publication number	US-2016185058-A1
Application number	US-201615060613-A
Country	US
Kind code	A1
Filing date	Mar 4, 2016
Priority date	Dec 14, 2012
Publication date	Jun 30, 2016
Grant date	—

Abstract

In a backlight module, a diffusive structure and a prism structure are replaced by a diffusive prism film formed on a substrate and transferred via In-Mold Decoration by Roller (IMR) to a light guide body via injection molding. A reflection film is also transferred to an opposite side of the light guide body via the same way. In such way, optical films may be readily transferred to the light guide body via two-side IMR during the process of injection molding of the light guide body, saving room taken by substrates of the optical components.

First claim

What is claimed is:

1 . A method for manufacturing a light guide plate, comprising following steps:
forming a diffusive prism film on a substrate; attaching the diffusive prism film and the substrate to a first mold and using a first pressing frame for clamping edges of the diffusive prism film; injecting plastics into a mold cavity formed between the first mold and a second mold for forming a light guide body; and separating the light guide body from the first mold and the second mold; wherein when the light guide body is separated from the first mold, the diffusive prism film is transferred onto a first surface of the light guide body such that a light guide plate is formed.

2 . The method of claim 1 , wherein forming a diffusive prism film on a substrate comprising following steps:
forming micro structures on the substrate via hot embossing; coating a de-bonding layer on the substrate; coating a decorative film on the de-bonding layer and forming micro structures on the decorative film, wherein the decorative film contains diffusive particles; and coating an adhesive layer on the decorative film.

3 . The method of claim 2 , wherein separating the light guide body from the first mold and the second mold comprising:
separating the substrate and the de-bonding layer from the decorative film of the diffusive prism film.

4 . The method of claim 3 , wherein forming a diffusive prism film on a substrate comprising following steps:
coating a consolidated layer on the substrate; forming micro structures on the consolidated layer via hot embossing and consolidating the consolidated layer; coating a decorative film on the consolidated layer and forming micro structures on the decorative film, wherein the decorative film contains diffusive particles; and coating an adhesive layer on the decorative film.

5 . The method of claim 4 , wherein separating the light guide body from the first mold and the second mold comprising:
separating the substrate and the consolidated layer from the decorative film of the diffusive prism film.

6 . The method of claim 5 , wherein the first mold comprises a channel and a sprue connected between the channel and the mold cavity, the pore size of the sprue greater than the pore size of the channel, the substrate and the diffusive prism film comprising a through hole corresponding to the location of the sprue, the first pressing frame comprising an isolating part corresponding to the location of the sprue, the isolating part comprising a convex pore, the method further comprising step:
when the first pressing frame is clamping the edges of the diffusive prism film, disposing the isolating part of the first pressing frame at the sprue for connecting the convex pore to the channel and positioning the isolating part between the sprue and the through hole.

7 . The method of claim 6 , further comprising step:
attaching a reflective film to the second mold and using a second pressing frame for clamping edges of the reflective film; wherein when the light guide body is separated from the second mold, the reflective film is transferred onto a second surface of the light guide body.

8 . The method of claim 1 , wherein forming a diffusive prism film on a substrate comprising following steps:
coating a consolidated layer on the substrate; forming micro structures on the consolidated layer via hot embossing and consolidating the consolidated layer; coating a decorative film on the consolidated layer and forming micro structures on the decorative film, wherein the decorative film contains diffusive particles; and coating an adhesive layer on the decorative film.

9 . The method of claim 8 , wherein separating the light guide body from the first mold and the second mold comprising:
separating the substrate and the consolidated layer from the decorative film of the diffusive prism film.

10 . The method of claim 1 , wherein the first mold comprises a channel and a sprue connected between the channel and the mold cavity, the pore size of the sprue greater than the pore size of the channel, the substrate and the diffusive prism film comprising a through hole corresponding to the location of the sprue, the first pressing frame comprising an isolating part corresponding to the location of the sprue, the isolating part comprising a convex pore, the method further comprising step:
when the first pressing frame is clamping the edges of the diffusive prism film, disposing the isolating part of the first pressing frame at the sprue for connecting the convex pore to the channel and positioning the isolating part between the sprue and the through hole.

11 . The method of claim 10 , further comprising step:
attaching a reflective film to the second mold and using a second pressing frame for clamping edges of the reflective film; wherein when the light guide body is separated from the second mold, the reflective film is transferred onto a second surface of the light guide body.

12 . The method of claim 1 , further comprising step:
attaching a reflective film to the second mold and using a second pressing frame for clamping edges of the reflective film; wherein when the light guide body is separated from the second mold, the reflective film is transferred onto a second surface of the light guide body.

13 . An equipment for manufacturing a light guide plate, comprising:
a first mold comprising a channel and a sprue having pore size greater than the pore size of the channel; a second mold assembled with the first mold such that a mold cavity is formed therebetween, wherein the sprue of the first mold is connected between the channel and the mold cavity; and a first pressing frame adapted for being assembled to the first mold so as to clamp a transfer film to the first mold, the first pressing frame comprising an isolating part corresponding to the location of the sprue, the isolating part comprising a convex pore, the isolating part disposed at the sprue and the convex pore connected to the channel.

14 . The equipment of claim 13 , further comprising a second pressing frame adapted for being assembled to the second mold so as to clamp a transfer film to the second mold.

Assignees

• Wistron Corp

Inventors

• Hsu Ching-Fu
• You Jia-Chi
• Chen Chien-Wei

Classifications

• B29C45/14065

  Positioning or centering articles in the mould · CPC title

• B29L2011/0075

  Light guides, optical cables · CPC title

• B29D11/00721 Primary

  involving preforms for the manufacture of light guides · CPC title

• B29D11/00798

  Producing diffusers · CPC title

• B29C45/26

  Moulds · CPC title