Abstract
Rolic® Light Controlled Molecular Orientation (LCMO) technology is the basis for todays advanced mass production technologies for large LCD-TV panel, high-resolution 3D patterned-retarders and high-resolution optical security devices. This fundamental technology allows an easy achievement of high resolution azimuthal LC-director patterns with defined bias angles, from homogeneous planar to homeotropic orientation, depending on the target application [1-7]. In addition to the control of bias angles, LCD panel manufacturers require alignment layers with a wide range of optimized properties. Thin alignment films must be easily coatable and should have high photosensitivity in order to achieve fast processing. The photoalignment film should also have high stability and good electrical properties such as Voltage Holding Ratio (VHR), Residual DC (RDC) and image sticking. Because of in-situ photo crosslinking during processing [1, 2], our proprietary LCMO photoalignment technology is shown to be thermally and optically stable. Last years, enormous progress has been made in the development of advanced materials that meet all requirements for mass production of large-area flat panel displays. LCMO-VA technology, for vertical alignment LCDs, is the basis for the state of the art UV2A production technology recently used in the manufacturing of advanced new generation LCD-TV panel displays with reduced production costs and low energy consumption [8, 9]. LCMO-VA mechanism and performances of state of the art materials will be discussed.
Highlights
Homogeneous and stable alignment of liquid crystals (LCs) with well defined bias tilt angles over large areas is a prerequisite for large-scale manufacturing of liquid crystal displays (LCDs) as well as other LC based devices such as optically patterned retarders for 3D and anti-counterfeiting
Until recently conventional alignment methods such as the rubbing of polyimide layers or geometrical patterning via photo-litoghraphic processing were the methods of choise for large-scale production of LCDs
Based on Rolic long-term expertise and design capabilities, the different groups can be fine tuned to control alignment, alignment homogeneity, pretilt and their stability as well as other required electrical- and electro-optical performances such as Voltage Holding Ratio (VHR), Residual DC (RDC) and image sticking
Summary
Homogeneous and stable alignment of liquid crystals (LCs) with well defined bias tilt angles over large areas is a prerequisite for large-scale manufacturing of liquid crystal displays (LCDs) as well as other LC based devices such as optically patterned retarders for 3D and anti-counterfeiting. Because of in-situ photo crosslinking during processing [1, 2], our proprietary LCMO photoalignment technology is inherently thermally and optically stable. This renders LCMO the fundamental photo-alignment technology for many displays and non-displays applications. LCMO-3D for manufacturing of highresolution patterned-retarders for 3D displays on large glass and recently on plastic via roll-to-roll coating Another achievement in non-display applications is customer specific manufacturing of first level (such as SECUNOTE TM Diamond) as well as second level (such as SECUNOTE TM Oyster) optical security devices for governmental fiscal and identity documents. Our newly developed LCMO-VA photoalignment technology for multi-domain VA-LCDs, allows high speed generation of homogeneous and stable bias tilt angles without fluctuations over large areas.
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