入光V-cut設計對背光模組輝度影響之研究

The Study on the influence of V-Cut design to the Brightness Distribution of BLM

林伯樺(Bo-Hua Lin)

指導教授 ： 王世明

中原大學/工學院/光機電及資電控產業研發碩士專班/碩士(2007年)

https://doi.org/10.6840/cycu200700101

摘要

本研究藉由電腦輔助軟體SPECTER建構2.2吋背光模組模型，並且研究導光板入光V-Cut的頂角角度、V-Cut間的間距，對最終背光模組的中心輝度、平均輝度、均勻性與最高輝度的影響。首先選擇一反射面網點讓均勻性可達到80%，並固定此一反射面網點搭配在不同之導光板入光V-Cut所建立之背光模組，且藉由反射面上網點破壞光的全反射，將光導出模組，利用SPECTER光線追跡的功能，從LED發射光線經導光板入光面在導光板內進行能量傳播，都可清楚的觀看光線行進的軌跡，並在可視區(Active area)，利用SPECTER輝度觀測的功能建立輝度觀測面(Observer)，觀看中心輝度、平均輝度、均勻性與最高輝度的變化，並比較輝度間的差異，從中選擇效果較佳的V-Cut進行開模實作。
在導光板入光V-Cut實驗模擬誤差收斂至6.8%的條件下，調整LED的入光量來縮小模組模擬輝度值與實際模組輝度值差異，發現中心輝度、平均輝度與均勻性的誤差分別為1.2%、0.5%、7.6%，而最高輝度的誤差達51.4%，可能是區域太靠近LED側，造成計算時產生的奇異點所致，由此研究發現最佳的入光V-Cut角度為120°、入光V-Cut間距為0.2mm。

關鍵字

背光模組 ； V-cut

並列摘要

The effect of the vertex angle of V-cut and the pitch distance between V-cuts in the light incident surface of light guide plate (LGP) on the brightness performance of the back light module (BLU) is studied. A 2.2-inch back light module is established and simulated this model by the aid of Specter software.
To simplify the LGP condition, the dot pattern is fixed in the reflection surface. The criterion for this selective dot pattern is that the 9-point brightness uniformity of BLU is higher than 80%.
The Specter has a light trace capability on the simulated BLU. The light is emitted from the LED, passes into incident V-cut surface and transports through whole LGP by internal reflection repeatedly. The light leaves the LGP when it hits the irregular surface and breaks the internal reflection condition. The light trace phenomena are observed by Specter to treat the light in the LGP as an object traveling history. A special function, called observer, is established in the active area of the LGP to monitor the variation of the central brightness, average brightness, uniformity and maximum brightness with the different V-cut geometric features. After evaluating the difference among the simulated results, we select an optimal result and practice a mold for comparison purpose.
The simulated error converged limit of this study is set as 6.8% to reduce the calculating time. The LED lumen is adjusted to fit the gap between the experimental data and simulated result. After adjustment, the gaps of the central, average brightness and uniformity are 1.2%, 0.5% and 7.6% respectively. However, the maximum brightness has 51.4% gap and occurs the region neighboring to LED. This significant difference may come from singularity calculation when the calculated area is close to LED. The optimal V-cut vertex angle obtained is 120o and the pitch distance is 0.2mm under this studied condition.

並列關鍵字

back light module ； V-cut

參考文獻

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