Shui-Chih Alan Lien

Active-matrix display using ion-beam-processed polyimide film for liquid crystal alignment

Ion-beam bombardment was developed as a substitute for mechanical rubbing of polyimide film as a noncontact liquid crystal (LC) alignment technique. The ion-beam technique was applied to a high-resolution thin-film-transistor-addressed liquid crystal display (TFT/LCD) panel. The results showed that LC alignment was achieved and that the display is capable of showing high-quality images.

56.3: Development of One Drop Fill Technology for AM‐LCDs

A new cell process for TFT-LCDs which integrates the liquid crystal (LC) injection with the glass substrate assembly process has been developed and has similarities to that previously reported for passive LCDs. In this process LC is applied in droplets directly onto the glass substrate, and results in reduced LC waste, reduction of fabrication time, and overall process simplification. With this technology, we fabricated 22 inch diagonal, high-resolution products and achieved better cell gap uniformity and fast (16.7 ms) time response for the in-plane switching (IPS) mode LCDs.

A 10.5-in.-diagonal SXGA active-matrix display

A 157-dot-per-inch, 262K-color, 10.5-in.- diagonal, 1280 × 1024 (SXGA) display has been fabricated using a six-mask process with Cu or Al-alloy thin-film gates. The combination of high resolution and gray-scale accuracy has been shown to render color images and text with paperlike legibility. The low-resistivity gate metallization and trilayer-type TFTs with a channel length of 6-8 µm were fabricated with a six-mask process which is extendible to larger, higher-resolution displays. A combination of double-sided driving and active line repair was used so that open gate lines or data lines did not result in visible line defects. A flexible drive-electronics system was developed to address the display and characterize its performance under different drive conditions.

Understanding crosstalk in high-resolution color thin-film-transistor liquid crystal displays

Results correlating observed crosstalk-induced color artifacts as a function of the four signal-driving schemes used in high-resolution color thin-film-transistor liquid crystal displays (TFT/LCDs) are presented and theoretically explained. Experimental characterization has been carried out on a high-resolution 146-dot-per-inch, 262K-color, 5.5- in.-diagonal, 480 × 640-pixel (VGA) display. Mathematical modeling and simulations have been developed that help explain the crosstalk-induced color artifacts. The modeling is particularly advantageous for quantifying various tradeoffs between front-of-screen quality and signal-driving schemes when scaling pixel density toward higher-resolution TFT/LCDs.

56.1: Novel LC Alignment Method using Diamond Like Carbon Film and Ion Beam Alignment

A novel LC alignment method has been developed. In this, the conventional polyimide film and cloth rubbing have been replaced by a diamond-like-carbon film and an ion beam respectively. The novel method has been used in pilot-line manufacturing to produce super high quality panels: 15″ TN mode and 22″ IPS mode. These panels will be demonstrated, and the advantage of new method will be discussed.