新二階電極結構於負型液晶垂直配向邊緣場效驅動之設計

Abstract

隨著顯示技術邁向高效率、低功耗發展，液晶顯示器對於穿透率、操作電壓與反應時間的要求日益嚴苛。負型液晶垂直配向邊緣場效驅動（VA-FFS）模式雖具備優異的視角特性，但傳統結構常面臨光學穿透率偏低或在長持續時間驅動下穩定性不足的挑戰。 為克服上述限制，本研究旨在開發一種兼具高產能與高光學效能之二階電極結構與電壓配置。過去研究雖提出多階結構，如 4-Level堆疊電極設計以提升電場強度，但複雜的結構不僅增加製程成本，亦產生電場相互消耗之現象。本研究首先透過重新配置三電極電壓，研發出可理順電場分佈之三階優化配置；隨後，進一步運用電場的等效，成功將結構精簡至最終之二階方案。此設計不僅保留了原先電場的高效驅動能力，更大幅降低了複雜度與厚度。 實驗結果顯示，本研究所提出之創新二階結構具備極佳的效能。在僅 6V 的低操作電壓下，光穿透率提升至 90.52%，達到極高效能。在反應時間方面，除了擁有1.6ms的快速上升時間，該結構能有效抑制配向紊亂現象，並將回復時間控制在 2.72 ms，展現出優異的表現。此外，本研究提出的三階與二階設計，具有高度廣適性。通用於各種幾何圖形電極，並且一樣保持極高效能。也可套用特殊電極設計更進一步提升性能。例如本研究將交錯式頂層電極用於二階設計，在操作電壓6v下，穿透率可提升至94.20%，回復時間降至2.5ms。 綜合而言，本研究提出的二階與三階配置，突破了特定結構的應用限制，提供了一套可跨結構、兼具「高穿透率、低功耗、製程簡化」優勢的技術方案。此具備廣適性的電場設計思維，為未來高畫質與超低功耗之液晶先進顯示器開發提供了極具產業競爭力的整合路徑。

As display technology advances toward high efficiency and low power consumption, the requirements for transmittance, operating voltage, and response time in liquid crystal displays (LCDs) have become increasingly stringent. Although the vertical alignment fringe field switching (VA-FFS) mode with negative liquid crystals offers excellent viewing angle characteristics, conventional structures often face challenges such as low optical transmittance or insufficient stability under long-duration driving. To overcome these limitations, this study aims to develop a 2-Level electrode structure and voltage configuration that achieves both high productivity and high optical performance. While previous research has proposed multi-level structures, such as 4-Level stacked electrode designs to enhance electric field strength, such complex structures not only increase manufacturing costs but also lead to mutual consumption of electric fields. This research first developed an optimized 3-Level configuration capable of streamlining the electric field distribution by re-configuring the voltages of three electrodes; subsequently, by applying the Field Equivalence Principle, the structure was successfully simplified into a final 2-Level scheme. This design not only retains the high-efficiency driving capability of the original electric field but also significantly reduces complexity and device thickness. Experimental results demonstrate that the innovative 2-Level structure proposed in this study possesses excellent electro-optical characteristics. At a low operating voltage of only 6V, the optical transmittance is increased to 90.52%, achieving extremely high efficiency. Regarding response time, the structure effectively suppresses alignment disorders under small electrode gaps and maintains a fall time of 2.72 ms, demonstrating superior performance. Furthermore, the 3-Level and 2-Level designs proposed in this study exhibit high generalizability. They are universally applicable to various electrode geometries while maintaining consistently high efficiency. They can also be integrated with special electrode designs to further enhance performance. For instance, by applying an interleaved top electrode to the 2-Level design, the transmittance can be increased to 94.20% and the fall time reduced to 2.5 ms at an operating voltage of 6V. In summary, the 2-Level and 3-Level configurations proposed in this research break through the application limitations of specific structures, providing a technical solution that is cross-structural and offers the advantages of "high transmittance, low power consumption, and process simplification." This highly generalizable electric field design approach provides an industrially competitive integration path for the development of future high-definition and ultra-low-power advanced liquid crystal displays.