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In advanced thin film transistor liquid crystal display devices (TFT-LCDs), alignment layers (ALs) are playing an ever-increasing important role for achieving a high-quality optoelec‐ tronic display [1]. The main function of AL materials is to align the rod-like liquid crystal (LC) molecules at a constant angle (so-called pretilt angle) to the local surface. Thus, when the electrical field is applied, the LC molecules can respond rapidly so as to result in a dis‐ play effect. The characteristics of AL materials, including their abilities to achieve a proper pretilt angle for LC molecules, to achieve a high voltage holding ratio (VHR) and a low re‐ sidual direct circuit voltage (RDC) value for the LCD devices, high thermal stability, high mechanical strength to resist rubbing process and their planarization ability are often taken into deliberate consideration in developing new generations of TFT-LCDs [2].

intech ebooks

Organo-Soluble Semi-Alicyclic Polyimides Derived from Substituted-Tetralin Dianhydrides and Aromatic Diamines: Synthesis, Characterization and Potential Applications as Alignment Layer for TFT-LCDs