| dc.description.abstract | Owing to the continuous progress on the technology of Liquid Crystal Display (LCD), the current technical development are focusing on pursuing the thinner thickness, lower weight, higher brightness and higher uniformity.
As we knew, the LCD device is capable of displaying the image on account of the backlight unit and the most general backlight unit people adopted has moved forward from CCFL to LED. In the big-size LCD device, to achieve the goal of thinner and lighter, the most popular type of incident light is the Side-Incident type. The Side-Incident illuminant should match up to the designed patterns upon the Light Guide Plate (LGP) to distribute the light uniformity and the current patterns upon the LGP are majorly fabricated by the printing method in Industry.
Based on the data provided from current mass production line, the general standard of light uniformity of 19” BLU (Back-Light Unit) is around 81% to 83%. In this thesis, the Taguchi Method, Fishbone Diagram and abundant work experiences are adopted to analyze the problem scientifically. By way of those tools and knowledge, the L27 Array and 4 control factories, Pattern Diameter, Ink Ratio, Baking Time and Ink Viscosity are selected to be the Orthogonal Array and Control Factors, respectively. In the final, the Reliability Analysis (RA) is used to validate the result.
According to the result of this thesis, the best parameter set is: Dot Diameters: +10%, Ink Ratio: 20:1, Baking Time: 30 minutes and Ink Viscosity: 2200 cps. Moreover, on the basis of the experimental result, the S/N ratio increased 4.4 dB in comparison with the original result and the uniformity raised from 81%~83% to 88%~90%.
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