導光板V-Cut微結構密度與幾何參數對LCD背光模組光學性質影響之研究

Study on Optical Influences of the Density of V-Cut Microstucture and Geometical Parameters on the Light Guide Plate for LCD Backlight Module

黃韋強(Wei -Chiang Huang)

指導教授 ： 于劍平

崑山科技大學/工程學院/機械工程研究所/碩士(2008年)

摘要

近年對於顯示器背光模組光學的研究相當廣泛，其中以導光板微結構光學輝度與均齊度為研究之重點。因導光板(LGP)為液晶顯示器(LCD)背光模組的重要元件，可控制液晶顯示器之光學輝度值大小與均齊度分佈；故要增加液晶顯示器光學顯示效率及輝度均勻性，就必須針對導光板微結構作設計。
本研究之重點為導光板V溝（V-Cut）微結構設計，主要針對V-Cut微結構對於光學輝度分佈的影響，本文分析中對於底部V-Cut角度、V-Cut密度、V-Cut深度，入光側V-Cut角度、入光側V-Cut密度、入光側V-Cut深度及LED出光面表面微結構分別做改變，且變更會相互影響的幾何參數，探討光學輝度改變之情況。
經本文分析可得知，底部V-Cut微結構之密度愈大時，光線愈容易集中在前段；而當改變深度時，同時改變密度的會比改變角度的效果較佳。而改變角度時，同時改變深度的效果會比改變密度為佳。
入光側V-Cut微結構當V-Cut密度愈大時，光線愈容易集中在光源前端區域。當改變角度時，同時改變密度會比改變角度佳。而當改變深度時，同時改變角度的效果會較佳。
而在LED的表面建構弧狀結構，本文分析結果證實，輝度比無弧狀結構輝度高出450~600流明，且輝度值最高與最低的比值也由原本的10:3提升到10:8，可提供業界設計之參考！

關鍵字

V溝密度 ； 輝度 ； 導光板 ； 背光模組 ； 弧狀結構

並列摘要

In recent years, the optical investigations of backlight module for liquid crystal display (LCD) are used extensively, and the key points of research are brightness and uniformity of micro-structure on light guide plate (LGP). Because light guide plate is one of the most important components of LCD backlight module and control the optical brightness value and the uniformity distribution of LCD. Therefore, in order to improve the LCD display efficiency and brightness uniformity, we must be aimed at designing the micro-structures on light guide plates.
The design of V-Cut micro-structure on the light guide plates is the important point of this study, and we are aimed at the influences between V-Cut micro-structure and optical brightness distribution. In the analysis of this study, the V-Cut angle, V-Cut density, V-Cut depth on the bottom of light guide plate, as well as the V-Cut angle, V-Cut density, V-Cut depth on the light incident side, and the LED structure in front of lighting surface were selected and then the geometrical influencing factors will be changed to investigate the condition of optical brightness distribution.
Based on the analyzed results, the V-Cut density at the bottom of the micro-structure is bigger; the light concentrating in front of LGP is easier. And when the depth was changed, the effect of changing density in the meantime was better than changing angle. However, when the angle was changed, the effect of changing depth was better than changing density.
When the density of V-Cut on the light incident side is increased, the light is more easily concentrated in the front region of light source. When the angle was changed, the effect of changing density in the meantime was better than changing angle. However, when the angle was changed, the effect of changing depth was better than changing density.
Based on the analyzed results of constructing the arc-shaped structure on the LED surface, the brightness was higher 450~600 lm than no arc-shaped structure, and the ratio of highest brightness and lowest brightness is increased from 10:3 to 10:8. We can provide the reference of optical design in the industry.

並列關鍵字

V-Cut density ； Brightness ； Light guide plate (LGP) ； Back light module (BLM) ； Arc-shaped structure

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