METHOD FOR MANUFACTURING LIGHT GUIDE PLATES
A method for manufacturing a light guide plate, includes: providing a first mold having a first contact surface, a second mold, and a reflector having a reflecting surface, the first mold defining a cavity from the first contact surface toward an inner portion thereof and having a gate communicated with the cavity; sandwiching the reflector between the first and second molds with the reflecting surface tightly contacting with the contact surface to enclose the cavity; injecting molten transparent resin into the cavity through the gate to fill the cavity up with the molten transparent resin, thereby forming a light guide plate body on the reflecting surface of the reflector; cooling the light guide plate body to solidify the light guide plate body in the cavity; and separating the first and second molds.
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1. Technical Field
The present disclosure relates to a method for manufacturing a light guide plate, and more particularly, a method for manufacturing a light guide plate including a light guide plate body and a reflector formed on a surface of the light guide plate body.
2. Description of Related Art
Liquid crystal display devices usually adopt backlight modules as light source. A backlight module generally includes a light guide plate and a light source. The light source is located beside one end or two opposite ends of the light guide plate, used to emit incident light beams into the light guide plate. The light guide plate is used to lead travel of the incident light beams therein and ensure that most of the incident light beams can be emitted from an emission surface thereof. In this way, linear light sources, such as cold cathode fluorescence lamp (CCFL), or point light sources, such as light emitting diodes, are converted into surface light sources.
The light guide plate generally includes a high transparent plate and a reflector. In a process of manufacturing the light guide plate, a high transparent plate and a reflector are fabricated separately, and then the reflector is attached on at least a surface of the transparent plate except a light incident surface thereof. The process costs much time. It is necessary to provide a method for manufacture a light guide plate to improve industrial efficiency.
Many aspects of the method for manufacturing a light guide plate can be better understood with reference to the following drawings. The components in the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of embodiments. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the different views.
Referring to
In step 1, as shown in
The reflector 20 includes a base 21 and a reflecting layer 22 formed on a surface of the base 21. The base 21 is made of a material selected from the consisting group of plastic, glass, ceramic, and metal. The reflecting layer 22 is made of silver, having a reflecting surface 221 for reflecting the light emitting from a point light source onto a light output surface of a light guide plate. Alternatively, the reflector 20 contains a typical white reflecting member in an inner portion thereof.
In step 2, as shown in
In step 3, as shown in
In step 4, as shown in
Additionally, the reflector 20 is trimmed to the same shape and size with the light guide plate body 30a after pulling the light guide 50 out of the injection molding machine 10. In the present embodiment, the light guide plate body 30a is directly formed on the reflector 20 using injection molding method. Therefore, the process is simplified, and time is saved.
While certain embodiments have been described and exemplified above, various other embodiments will be apparent to those skilled in the art from the foregoing disclosure. The present invention is not limited to the particular embodiments described and exemplified but is capable of considerable variation and modification without departure from the scope of the appended claims.
Claims
1. A method for manufacturing a light guide plate, comprising:
- providing a first mold having a first contact surface, a second mold, and a reflector having a reflecting surface, the first mold defining a cavity in the first contact surface toward and having a gate communicated with the cavity;
- sandwiching the reflector between the first and second molds, the reflecting surface tightly contacting the contact surface thus the cavity being covered by the reflector;
- injecting molten transparent resin into the cavity through the gate to fill the cavity up with the molten transparent resin, thereby forming a light guide plate body on the reflecting surface of the reflector;
- cooling the light guide plate body to solidify the light guide plate body in the cavity; and separating the first and second molds.
2. The method of claim 1, further comprising trimming the reflector until the shape such that the size of the reflector is substantially same as that of the light guide plate body.
Type: Application
Filed: Jul 21, 2009
Publication Date: Nov 12, 2009
Applicant: HON HAI PRECISION INDUSTRY CO., LTD. (Tu-Cheng)
Inventor: HSIN-CHIN HUNG (Tu-Cheng)
Application Number: 12/506,444
International Classification: G02B 6/132 (20060101);