三面微結構導光板之光學設計與成型製程 對光學性質影響之研究

Study of Optical Design and Process Characteristics on the Optical Performance of the LGP with Three-side Micro Feature Design

黃松煒(Song-Wei Huang)

指導教授 ： 陳夏宗

中原大學/工學院/機械工程研究所/碩士(2007年)

https://doi.org/10.6840/cycu200700745

摘要

隨著平面顯示器產業的迅速發展，液晶顯示技術和顯示影像產品
追求更輕、更薄的趨勢與優良的表現品質。背光模組是主要提供液晶
顯示器光源的組件，其中以導光板是控制亮度及均齊度的重要元件，
其主要技術包含微結構光學設計與成型能力，若能利用設計準則模擬
良好的光學品質，再搭配先進成型製程，將有效達到優良之導光板。
本論文研究以長40mm、寬30mm 搭配0.4mm、0.6mm 兩種厚度
變化之射出成型導光板，先利用光學模擬軟體TracePro 進行分析，
設計各種微結構之間的光學特性，以實際開模射出成型與模擬進行相
互之驗證。利用射出成型製程及參數間的變化，量測出微結構之複寫
率，再以輝度計得到實際導光板之光學輝度的分佈，與修正後之光學
模擬行驗證比對，討論導光板微結構複寫率對光學品質間的趨勢。
由研究結果顯示，微結構複寫率會隨模具溫度與熔膠溫度增加而
提升，傳統射出製程有較明顯之遠近澆口複寫率差異，使用感應加熱
技術不僅可提升整體複寫率，同時降低了複寫率的差異。原始與修正
後模擬結果比較，平均輝度只有佈點搭配平行V 有提升，其他組合
皆降低，顯示出光面頂角角度減小，會減少出光的機率。在複寫率與
輝度間的驗證結果，光學輝度最佳表現參數傳統射出參數模具溫度
60℃、熔膠溫度250℃，在四種變厚度及不同反射面的組合中皆有
最高值的表現，與傳統射出參數模具溫度220℃、熔膠溫度40℃
相互比較其平均輝度與入光、出光及反射面之複寫率，在厚度
0.4mm 導光板之漸層V 搭配平行V，平均輝度多133.64nt，複寫
率分別增加4.39%、10.18%、12.25%；佈點搭配平行V，平均輝
度多26.11nt，複寫率分別增加5.01%、5.62%、7.92%。在厚度0.6mm
導光板之漸層V 搭配平行V 平均輝度多99.5nt，複寫率分別增加
4.46%、8.64%、14.18%；佈點搭配平行V，平均輝度多65.25nt，
複寫率分別增加4.93%、8.78%、8.98%。顯示微結構複寫率的增
加，可以對光學輝度有進一步的提升。

關鍵字

光學輝度 ； 射出成型製程 ； 微結構複寫率 ； 導光板

並列摘要

As a result of the industry of flat display developing rapidly, the
liquid crystal display and back light module are demanded to be thinner
and lighter. The light guide plate is the key issue of the brightness and the
uniformity in the back light module. At present, the design and molding
ability of micro optic structure are the main technology of the light guide
plate. In addition, using a simulation to shorten the design and
development process becomes the trend for the light guide plate.
In this study, a light guide plate of 30mm in width by 40mm in
length is design using different micro optic structure on the surface. A
simulation using TracePro also was applied to analyze the optical
performance of the light guide plate. The purpose of this research is to
study the influence of replication accuracy on the brightness and the
luminance uniformity between traditional injection molding, injection
compress molding and induction heating injection molding. 3D laser
microscope and a luminance meter were used to measure the replication
accuracy and luminance of the light guide plate.
The processing conditions studied include mold temperature and
melt temperature. It was discovered that mold temperature and melt
temperature are two key parameters affecting the replication accuracy
significance. With induction heating, replication accuracy can be
improved and the replication difference can be reduced on the entire light
guide plate. Comparing the simulation result with original design and the
modified design; the decrease of the angle of the V groove can reduce the
exit of the light. The luminance result showed that the traditional
injection molding was better than the other process with mold
temperature at 60℃ and melt temperature at 250℃. The traditional
injection molding processes includes mold and melt temperatures at 40℃
and 220℃ respectively. During experimentation, four specific cases wave
performance including a gradual V-groove and V-groove combination at
both 0.4mm and 0.6mm, and a Dot and V-groove and V-groove
combination at both 0.4mm and 0.6mm.The result shows that higher
temperature increases average luminance 133.64nt, 99.5nt, 26.11nt,
65.25nt. In addition, V groove on entering side, V groove on exiting side
and gradual V groove on reflecting, get replication rises of 4.39%、4.46%,
10.18%、8.64% and 12.25%、14.18%; V groove on exiting side and
gradual V groove on reflecting, get replication rises of 5.01%、4.93%,
5.62、8.78% and 7.92%、8.98% respectively.

並列關鍵字

Light guide plate ； Luminance ； Injection molding ； Replication

參考文獻

向”，拓墣產業研究所焦點報告。 (2007.01)

16. 秦進傳，“微結構模具快速變溫技術之研究”，中原大學碩士論文。

17. 林欣靜，“應用四元樹切割光子群於動態場景之全域照度估計”，

3. 黃順智，“具圖案印刷與微特徵設計導光板光學之分析”，中原大

5. Hsiharng Yang, Ching-Kong Chao, Mau-Kuo Wei, “High Fill-factor