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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.


Sampled 25 positions for measuring the brightness of display
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f7-sensors-08-00877: Sampled 25 positions for measuring the brightness of display

Mentions: The effectiveness of the matte finishing can be investigated from the optical characteristics of the injected LGP using the mold fabricated via the powder blasting under the optimized process conditions. Twenty five positions for measuring brightness are sampled as shown in Figure 7. Figure 8 shows variations brightness measured at 25 points versus 5 powder blasting conditions and 1 controlled injection condition. The average brightness values of the sampled 25 points for 5 different blasting conditions are 1,900-2,000cd/m2. Final average brightness after optimizing injection parameters is 2,053cd/m2. From Figure 7 and Figure 8, it can be seen that the closer the distance between the CCFL and measuring points becomes, the higher brightness becomes. These results should be improved in order to obtain more uniformly distributed brightness for entire surface.


Micro Dot Patterning on the Light Guide Panel Using Powder Blasting
Sampled 25 positions for measuring the brightness of display
© Copyright Policy
Related In: Results  -  Collection

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

f7-sensors-08-00877: Sampled 25 positions for measuring the brightness of display
Mentions: The effectiveness of the matte finishing can be investigated from the optical characteristics of the injected LGP using the mold fabricated via the powder blasting under the optimized process conditions. Twenty five positions for measuring brightness are sampled as shown in Figure 7. Figure 8 shows variations brightness measured at 25 points versus 5 powder blasting conditions and 1 controlled injection condition. The average brightness values of the sampled 25 points for 5 different blasting conditions are 1,900-2,000cd/m2. Final average brightness after optimizing injection parameters is 2,053cd/m2. From Figure 7 and Figure 8, it can be seen that the closer the distance between the CCFL and measuring points becomes, the higher brightness becomes. These results should be improved in order to obtain more uniformly distributed brightness for entire surface.

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.