Determination of Optimal Environmental Testing Condition - A Case Study on Backlight Module
| Autor: | Zheng-Jie Wang, 王鉦潔 |
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| Rok vydání: | 2010 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 98 The screen of notebook computer is composed of liquid crystal display (LCD) panel. Since LCD panel itself does not illuminate, backlight source is required to display the colors of the LCD panel. As a result, backlight module plays an important role in a variety of display devices. A good backlight module needs to be compatible with the characteristics of LCD panel, so optical properties of the backlight module are very important. Display devices used in notebook computers need to be thin and have high luminance, hence, the microstructure of light guide plate (LGP) needs to be lower to improve its uniformity, and thinner LGP can achieve higher luminance. Light-emitting diode is used in the backlight module of this study as a light source of the module, and ultrathin LGP transmits light source. Since the design of the LGP affects the distribution of light source, diffuser sheet is used to diffuse the light source in order to ensure good uniformity of the images. Prism sheet /bef is used to enhance the light, but the smoothness of the LGP may affect the luminance and average luminance of the optical center. Therefore, the smoothness of the LGP in the backlight module may affect the overall image quality, and simultaneously affect the service life of product (service life of product generally refers to the time during which the optical luminance decreases from 100 to 50). This study discussed the effect of the deformation (positive warpage) and optical quality of the backlight module on backlight module, and explored the optimal test conditions and worst quality characteristics so as to be implemented in future standardized regulation project. In the experiment, experiment was conducted at a high temperature and high humidity to find out the effects of different temperatures and humidity on the LGP. Then, Design-Expert was used to find the important factors affecting the deformation of the LGP, and these factors (temperature and humidity) were optimized. Lastly, the reliability of the optimization was verified by constant temperature and humidity experiment. This study found that when the backlight module was at a temperature of 50 ℃ and RH of 90%, the largest deformation (4.693mm) after experiment and the greatest average value △ (30.64%) of 160 points occurred. The analysis found that the errors were within 5%, thus proving that this temperature and humidity can be used as a basis for reference in future design of the backlight module. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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