Fabrication of Pigment-Based Electrowetting Display by Polyisobutylene-Amidoamine Disperants
Date Issued
2014
Date
2014
Author(s)
Lee, Tzu-Chien
Abstract
In Taiwan, the development of flat display devices has advanced the panel industry into prosperity and trend, and created an economic miracle in the past. However, this industry is facing high risk low-return investment and other related problems. By applying multi-incremental-based investment strategy and improving the manufacture processing, but results were unsatisfactory. The market price margin continues to decline. The related industries begin to evolve new directions of future industry development and seek for the next opportunity to make profit. Currently, the competition of flat panel displays will turn into fierce competition. The global community has been gradually investing on R&D for the next generation product. Many parts of flat panel displays remain to be explored and developed in this emerging market. It is possible that we could make our display industry from a high-efficient mass manufacturer into a pioneer of smart life innovation application supplier.
In this thesis, a new strategy has been taken to investigate the pigment-based colorants for the basic design in the electrowetting devices. The advantages of using pigments over dyes had been realized in the development of color filters and printing industries. We synthesized a new class of oily polyisobuytylene-functionalized derivatives as the dispersants for pigment dispersions. We also fabricated for the first time the electrowetting devices and studied the high differences, environmental-friendly issue, low-cost issue, and other critical technologies. The thesis is divided in two chapters (1) Tailoring Pigment Dispersants with Polyisobutylene Twin-Tail Structures for Electrowetting Display Application: We have designed a class of highly hydrophobic dispersants for finely dispersing carbon black and organic pigment nanoparticles in highly oily mediums. The structural design and the synthesis of polymeric dispersants with oily polyisobutylene molecular tails and multiple anchoring heads is essential for homogenizing the pigment dispersion in oil/water and subsequently exhibiting a high color resolution, suitable for EWD uses. (2) First Fabrication of Electrowetting Display by Using Pigment-in-Oil Driving Pixels: We report the first fabrication of pigment particle-based electrowetting display (EWD) by using the requisite poly(isobutylene)-imide (PIB-imide) for effectively dispersing insoluble colorant in decane/water system. The series of PIB-imide dispersants were prepared from the amidation/imidation of PIB-succinic anhydride with different hydrophobic lengths and a suitable amine. The structurally tailored dispersants by adopting the highly hydrophobic PIB tails allows the formation of homogeneous dispersion of nano-sized pigment particles in decane and clearly separated from water. The pigment dispersion at particle size of ca. 100 nm and a low viscosity of 2–3 cps was obtained and fabricated into an EWD device which was operated at AC voltage driver of 15–20 V in achieving a maximum aperture ratio of 80%. With the advantage of both fast response time and vivid color, the pigment-based EWD, stands out as a promising new option for future transparent display and serves as a critical foundation for the next-generation advanced display and electrical materials applications.
Subjects
顏料
碳黑
聚異丁烯
癸烷
分散劑
電濕潤顯示器
Type
thesis
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