Jyh-Wen Shiu

Single-layered multi-color electrowetting display by using ink-jet-printing technology and fluid-motion prediction with simulation

— This paper describes a single-layered multi-color electrowetting display (EWD) by using ink-jet-printing (IJP) technology and comparing different pattern electrodes with the use of the numerical investigations of ANSYS FLUENT®. This work consists of two parts: the first describes the design of implementing a single-layered multi-color EWD and the second demonstrates the application of ANSYS FLUENT® simulation in different pattern electrodes settings on the proposed EWD. The single-layered multi-color EW device was evaluated by using various colored oils without adopting a color filter. The single-layered multi-color EWD at a driving voltage of 25 V can achieve a maximum aperture ratio and reflectivity of 80% and 38.5%, respectively. The colored saturation of R, G, B oils can increase to 50% (NTSC: 13.3–27.8%). In addition, a radiate electrode at the required viewable area condition of 85% and force 5 * Fk, which results in ink stable contraction and a shorter response time of 50% (radiate vs. square), was proposed. The experimental results and simulation demonstrate that ink-jet-printing (IJP) technology along with the use of radiate electrodes can result in a single-layered multi-color EWD with a shorter response time.

A rugged display: Recent results of flexible cholesteric liquid-crystal displays

— A 3-m-long rugged flexible display having a novel single-plastic-substrate structure has been demonstrated with a coated cholesteric liquid-crystal mixture. The display is designed to be fabricated by a roll-to-roll process to increase productivity at a competitive cost. It has the advantage of having almost no limitation in display length. The high-resolution (300-dpi) monochrome cholesteric liquid-crystal display (ChLCD) can be achieved by using a photo-addressing method. A single-layered 10.4-in. color ChLCD also has been developed with good color and contrast.

10.1: Invited Paper: Roll-to-Roll Flexible Display for e-Paper Applications

The flexible display we describe here has a simple structure on single substrate. Disclosed more than a year ago, the display has steadily been improved in performance, such as in reflectance, contrast ratio, and driving voltage. In addition, a thermal addressing method is developed for high resolution e-paper application. A number of novel applications are also revealed in this report.

19‐1: A Novel Electrowetting‐based Display for Future Smart Window Application

Smart window is an emerging application for display industry. It can control the sunlight penetration and display information. In this paper, we had made 6-inch color smart window prototype by electrowetting-based technique. The ink jet process is adopted to dose various colored oil into sub-pixel to achieve color device. Without color filter, the transmittance of the device can be improved. Further, to evaluate the practicability of using the smart window device in the night, we had added luminescence substances into the colored oils and designed the cladding structure to achieve a luminous smart window.

30.2: Single Layer Full Color Cholesteric Display

An 80ppi ¼ VGA full color, single layer, Reflex™ display with red, green and blue reflecting sub-pixels is reported. A phototunable chiral dopant is UV exposed to produce these colors, and polymer walls keep the colors separate after tuning. We will present details of this development and discuss applications.

20.3: Full Color Cholesteric Liquid Crystal Display with High Color Performance

A 10 inch full color cholesteric liquid crystal display ChLCD with high reflectivity and high resolution is demonstrated. This display consists only one ChLC panel which is fabricated by the development of the pixelized vacuum filling PVF technique. The reflectivity of our ChLCD was improved to about 26% with 4bit color, its contrast ration is over 6 and the resolution is 100 ppi.

34.3: Novel Development of Multi-Color Electrowetting Display

A panel manufacturing process for multi-color electrowetting display (EWD) by using ink-jet printing (IJP) technique had been developed. To achieve multi-color, two strategies were used, i.e., by using black oil with color filter and by using various colored oils without adopting color filter. for colored oils, various dyes had been used to blend with alkane solution. Then, the jetting behavior of different colored oil for IJP was investigated. Here, a 6-inch multi-color EWD prototype with black oil and color filter was successfully fabricated, and a dual color EWD panel with black and red oils had also been first evaluated.

22.3: High Performance Full Color Cholesteric Liquid Crystal Display with Dual Stacking Structure

A 10.4-inch full color cholesteric liquid crystal display (ChLCD) with high reflectivity and high resolution by dual stacking is demonstrated. This display consists of two cholesteric liquid crystal (ChLC) panels with the same chirality ChLC but separated by a layer of half-wave plate material allow the reflection of both components of incident circularly polarized light in a single display. Each individual ChLC panel is fabricated by the development of the pixelized vacuum filling (PVF) technique. The reflectivity of our ChLCD is about 26% with 100 ppi resolution and 3-bit color.

6.3: Writable Cholesteric Liquid Crystal Display and the Algorithm Used to Detect its Image

Writable Cholesteric Liquid Crystal Display and the algorithm used to detect its image were developed. We could use any hard tip, ex: the tip of a forefinger, to directly write an image on the surface of Cholesteric Liquid Crystal Display (CHLCD). By measuring the capacitance of one pixel of test cell (12mm × 15mm/ 1×1), F-state or P-state could be detected. By measuring the capacitance of one pixel of 4.1″ CHLCD (241um × 241um/ 320×320), F-state or P-state could not be detected, due to the effect of parasitic capacitance. Therefore, high frequency measurement and the algorithm were developed to detect the image on CHLCD.

63.2: Single Layer Multi‐Color Electrowetting Display by Using Ink Jet Printing Technology and Fluid Motion Prediction with Simulation

For outdoor multimedia device, electrowetting display (EWD) is one of the potential technologies. In this paper, we evaluated the single layer multi-color EW device by using various colored oils without adopting color filter. The oils were dosed into the pixel by using ink-jet printing (UP) technique. for colored oils, in order to improve the color saturation of EWD panel, we used mixed solvent to increase the solubility of dyes. Then, by using UP technique, a single layer multi-color EW device was successfully fabricated and the optical property had been evaluated. Also, to improve the reliability of fluid motion, a simulation named FLUENT was first adopted to predict and realize the fluid behavior under different electric force.