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Micro Dot Patterning on the Light Guide Panel Using Powder Blasting

View Article: PubMed Central - PubMed

ABSTRACT

This study is to develop a micromachining technology for a light guide panel(LGP) mold, whereby micro dot patterns are formed on a LGP surface by a single injection process instead of existing screen printing processes. The micro powder blasting technique is applied to form micro dot patterns on the LGP mold surface. The optimal conditions for masking, laminating, exposure, and developing processes to form the micro dot patterns are first experimentally investigated. A LGP mold with masked micro patterns is then machined using the micro powder blasting method and the machinability of the micro dot patterns is verified. A prototype LGP is test- injected using the developed LGP mold and a shape analysis of the patterns and performance testing of the injected LGP are carried out. As an additional approach, matte finishing, a special surface treatment method, is applied to the mold surface to improve the light diffusion characteristics, uniformity and brightness of the LGP. The results of this study show that the applied powder blasting method can be successfully used to manufacture LGPs with micro patterns by just single injection using the developed mold and thereby replace existing screen printing methods.

No MeSH data available.


Basic components of a BLU
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f1-sensors-08-00877: Basic components of a BLU

Mentions: A typical TFT-LCD is composed of a LCD panel and a BLU. The BLU is composed of several parts, as shown in Figure 1 and the most important being the LGP, which is generally injected by injection mold using PMMA(polymethyl methacrylate). The main function of the LGP is to transform linear light source of a CCFL to uniform planar light via micro dots formed on the LGP. Generally, the dot size and its density varies from place to place according to the makers. The brightness and uniformity of a TFT-LCD depends strongly on these micro dot patterns. Also, it is known that smaller dots offer better brightness and uniformity.


Micro Dot Patterning on the Light Guide Panel Using Powder Blasting
Basic components of a BLU
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3927497&req=5

f1-sensors-08-00877: Basic components of a BLU
Mentions: A typical TFT-LCD is composed of a LCD panel and a BLU. The BLU is composed of several parts, as shown in Figure 1 and the most important being the LGP, which is generally injected by injection mold using PMMA(polymethyl methacrylate). The main function of the LGP is to transform linear light source of a CCFL to uniform planar light via micro dots formed on the LGP. Generally, the dot size and its density varies from place to place according to the makers. The brightness and uniformity of a TFT-LCD depends strongly on these micro dot patterns. Also, it is known that smaller dots offer better brightness and uniformity.

View Article: PubMed Central - PubMed

ABSTRACT

This study is to develop a micromachining technology for a light guide panel(LGP) mold, whereby micro dot patterns are formed on a LGP surface by a single injection process instead of existing screen printing processes. The micro powder blasting technique is applied to form micro dot patterns on the LGP mold surface. The optimal conditions for masking, laminating, exposure, and developing processes to form the micro dot patterns are first experimentally investigated. A LGP mold with masked micro patterns is then machined using the micro powder blasting method and the machinability of the micro dot patterns is verified. A prototype LGP is test- injected using the developed LGP mold and a shape analysis of the patterns and performance testing of the injected LGP are carried out. As an additional approach, matte finishing, a special surface treatment method, is applied to the mold surface to improve the light diffusion characteristics, uniformity and brightness of the LGP. The results of this study show that the applied powder blasting method can be successfully used to manufacture LGPs with micro patterns by just single injection using the developed mold and thereby replace existing screen printing methods.

No MeSH data available.