畫素技術應用最佳化於大尺寸TV液晶模組

Abstract

液晶電視(LCD-TV)具有低輻射、高解析度、低消耗功率、輕薄等優勢，可以提供較佳的影像品質。為了實現高畫質的需求，LCD TV 大多採取VA的畫素設計，此一設計具有較佳的反應時間(Response time)、高對比(Contrast Ratio)以及比TN較佳的廣視角(Wide-view angle)之優勢。 傳統的MVA設計上，針對廣視角部分表現可以更加改善，本篇針對廣視角色偏部份進行討論以及研討新型技術改善的成果。傳統四個 domain的設計上，在大視角的時候由於PMVA原先的四個domain液晶配向會造成較大的色偏現象，為了解決色偏問題，我們需要降低液晶配向時在大視角造成的漏光，所以需要另外再設計四個domain以改善色偏問題。4+4個domain可壓抑大視角的色偏現象，在實際的設計應用上，可以分類為分區獨立訊號控制(2D1G、1G2D)，驅動控制方式(Charging Sharing)….等等畫素技術，然而上述所提的畫素設計，均需要在面板模組增加額外的驅動IC以及電子元件來達成色偏問題解決，對於成本方面不會是較佳的選擇。然而本篇所提出的AMVA with ART(Advance-MVA with Additional Refresh TFT)之畫素設計原理是採取電容coupling的方式做分壓，在不需要增加電子元件成本的前提上，一樣可以達到解決色偏的效果。然而在初期開發中，產品會有gamma 變異的問題產生，故-本論文嘗試討論畫素技術中的設計因子對於gamma變異的影響，進而解決減少AMVA with ART設計中gamma變異的問題。

LCD TV has a low radiation, high-resolution, low power consumption, slim type and better image quality. In order to achieve the needs of high-definition, LCD TV are mostly taken by Multi-domain Vertical Alignment (MVA) technology, this design has better response time , high contrast ratio, as well as better performance than the TN in wide-view angle. The traditional four-domain design of the PMVA-LCD, with the phenomenon of color shift at large viewing angle, had been highlight in recently years. In order to solve the color shift problem, we need to reduce the light leakage of liquid crystal operation at wide-view angle, therefore, to improve the color shift problem. “4+4 domain = 8 domains” can reduce color shift in practical design applications. It can be classified as an independent signal operation model (2D1G, 1G2D), drive control method (Charging Sharing), etc.. However, the above-mentioned pixel designs require additional modules in the panel driver IC or electronic components to solve color shift problem, for the cost would not be a better solution. We proposed AMVA with ART design (Advance-MVA with Additional Refresh TFT) that principle is to take the method of pixel capacitance coupling for partial operation in one sub-pixel, without any additional cost of electronic components. It also can be achieved to solve color shift problem. However, AMVA with ART design suffered gamma variation, in this dissertation, we tried to discuss the factor of pixel design which dominates the performance of AMVA with ART technology. Finally, the optimized parameters of AMVA with ART technology were illustrated for gamma-variation(Color-washout) reduction.