即時運算處理適應性背光於色序法顯示器抑制色分離現象

近年來環保意識興起，各顯示器廠商及各研究單位都在積極開發節省能源消耗的顯示器，期望能夠減緩全球暖化現象。然而，在傳統的顯示器上，是用白色背光與彩色濾波片搭配，經由空間混色達到全彩的影像，因為背光穿透彩色率玻片的光效率不佳，要達到高亮度的影像，就得要提高背光的亮度，隨之即會產生過高的能量消耗。隨著高效率的發光二極體的發展，背光不再是用冷陰極射線管，而發光二極體可以產生的紅、綠、藍，三種基本的光顏色，利用這三種光顏色，可以混成各個顏色。因此，有人提出了色序法顯示器，將彩色濾波片移除，利用多彩的發光二極體，利用高頻率的時間混色，使人眼可以觀賞到彩色的影像，又使光效率上升。然而色分離現象會伴隨著色序法顯示器，因此提出了四個畫面形成一個彩色畫面，將主要影像資訊集中在一個畫面，其餘的三個畫面就可以減少亮度，色分離現象就可以被抑制。為了要將此概念實現在硬體上，需要做一些簡化，在找出最具代表的背光顏色，需將畫面分割成三等份，每一等份去做背光逼近的計算，當畫面資訊全部給入硬體後，即可即時運算背光顏色，並將其餘三個場的畫面計算出，使色序法顯示器能夠即時呈現畫面。

關鍵字

色序法；色分離；即時運算

並列摘要

In conventional liquid crystal display, using CCFL backlight and color filters to generate a full color image. However, the optical throughput is lowered owning to the color filters. The backlight needs to give more power to generate a high luminance image. Accompany with the highly improved LED technology, the power and life time of LED can substitute the CCFL backlight. Because multi-color LEDs can mix color using red, green, and blue colors, the color filters can be removed. Therefore, a new liquid crystal display is proposed called Field Sequential Color LCD. However, the color breakup happens when there is a relative motion during eye movement. We proposed four fields to combine a full color image. Let most information detail to display in specific field and rest of fields decrease its intensities. Then the color breakup is less observed. In order to implement on hardware with the concept, some simplification is needed. When finding the majority color of input image, we separate the image into three parts. Each part does the backlight convergence approach. Therefore, after image information is loaded into hardware, the adaptive backlight color is determined at the same time. Other three field images is re-calculated in the following. FSC LCD displays the image in a real-time process.

並列關鍵字

field sequential ； color breakup ； real time process

參考文獻

[1] F. Yamada, H. Nakamura, Y. Sakaguchi, and Y. Taira, “Sequential-color LCD based on OCB with an LED backlight,” J. Soc. Info. Display 10, pp. 81-85 (2002).

[6] A. Yohso and K. Ukai, “How Color Break-Up Occurs in the Human Visual System: Mechanism of Color Break-Up Phenomenon,” SID Symposium Digest 37, pp.1225-1228 (2006)

[7] K. Sekiya, K. Wako, S. Nakano, T. Ishinabe, T. Miyashita, and T. Uchida, “Overdrive for Compensating Color-Shift on Field Sequential Color TFT-LCDs,” SID Symposium Digest 35, pp.408-411 (2004)

[8] Y.-P. Huang, K.-H. Chen, C.-H. Chen, F.-C. Lin, and H.-P. David Shieh, “Adaptive LC/BL Feedback Control in Field Sequential Color LCD Technique for Color Breakup Minimization,” IEEE/OSA Journal of Display Technology (JDT) 4(3), pp.290-295 (2008)

[9] S.-H. Chien, C.-H. Chen, F.-C. Lin, Y.-P. Huang, and H.-P. David Shieh, “Real-Time Adaptive Backlight Algorithm for Field-Sequential-Color Displays,”

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即時運算處理適應性背光於色序法顯示器抑制色分離現象

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