Browsing by Author "Chiu, Cheng-Pu"

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BUBBLELESS PACKAGING METHOD
(2010-09-16)
FAN, Shih-Kang
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Hsu, Ching-Hsiang
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Chiu, Cheng-Pu
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Mo, Chi-Neng
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Chiang, Mei-Tsao
A bubbleless packaging method is provided. The method is applicable to package a display element. In the method, firstly, a first substrate and a first protective layer are provided. The first protective layer is formed on the first substrate. Then, a second substrate and a second protective layer are provided. The second protective layer is formed on the second substrate. Then, a plasma treatment is performed on surfaces of the first protective layer and the second protective layer. Then, the first substrate and the second substrate are dipped into a solution after the plasma treatment. Then, the first substrate and the second substrate are laminated in the solution, wherein the first protective layer faces the second protective layer. Finally, the first substrate and the second substrate are taken out from the solution.
Characterization and Packaging of Electronic Paper Display Based on Particle Polarization
(2009)
Chiu, Cheng-Pu
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Hsu, Ching-Hsiang
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Chen, Shih-Chiang
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Fan, Shih-Kang
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Chiang, Mei-Tsao
A particle-based reflective electronic paper has been characterized. Based on the particle polarization, we drive the neutral microspheres to form particle chains in a water solution by applying an AC electric field. The particle-chain transformation regulates the incident light and the reflectivity of the display. Here we developed the device packaging with hydrophilic surface treatments and UV sealing techniques. With a passive-matrix addressing scheme, a reflective electronic paper having 64x64 pixels by particle polarization is realized on a 4 inch by 4 inch panel.
DISPLAY
(2009-05-28)
Fan, Shih-Kang
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Chiu, Cheng-Pu
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Mo, Chi-Neng
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Chiang, Mei-Tsao
A display including a first substrate, a first electrode, a second substrate, a second electrode, and a mixed solution is provided. The first electrode is disposed on the first substrate, and the second electrode is disposed on the second substrate. In addition, the mixed solution is disposed between the first electrode and the second electrode. Moreover, the mixed solution includes a solution and a plurality of first neutral micro-particles disposed in the solution.
DISPLAY
(2010-06-17)
Fan, Shih-Kang
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Chiu, Cheng-Pu
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Hsu, Ching-Hsiang
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Mo, Chi-Neng
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Chiang, Mei-Tsao
A display includes a first substrate, a first electrode, a second substrate, a second electrode and a display material layer. The first electrode is disposed on the first substrate and the second electrode is disposed on the second substrate. The display material layer is disposed between the first electrode and the second electrode. The display material layer of the invented display includes a solution and a plurality of first micro beads, wherein each of the first micro beads further has a plurality of different axis lengths in different axis directions, and the axis length in at least an axis direction is different from the axis lengths in the rest axis directions so that the first micro beads present different arrangement densities in different driving frequencies under the influence of polarized self-arrangement effect.
DISPLAY MEDIUM AND DISPLAY
(2010-04-01)
Fan, Shih-Kang
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Chiu, Cheng-Pu
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Hsu, Ching-Hsiang
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Chiang, Mei-Tsao
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Mo, Chi-Neng
A display medium and a display are provided. The display medium includes a thermal-sensitive solution and a number of micro particles. The micro particles are dispersed in the thermal-sensitive solution. At a first temperature, the thermal-sensitive solution is in a liquid form, such that the micro particles move freely. At a second temperature, the thermal-sensitive solution is in a colloid form, such that the micro particles are fixed. The first temperature differs from the second temperature.
Droplet manipulation by electrowetting on polymer dispersed liquid crystal
(2007)
Chiu, Cheng-Pu
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Lin, Shang-Chih
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Fan, Shih-Kang
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材料科學與工程學系奈米科技碩博班
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Graduate Program of Nanotechnology , Department of Materials Science and Engineering
Droplets were successfully manipulated on an electrowetting-on-dielectric (EWOD) device whose dielectric layer was a polymer dispersed liquid crystal (PDLC) thin film. Dielectric layer is essential to EWOD since it would store charges and change the surface wettability. Therefore, most of the research on the dielectric material was focused on its dielectric constant and strength. However, besides serving as only a capacitor, many dielectric materials possess other physical or chemical characteristics including optical, thermal, and mechanical properties. In this paper, we introduced and investigated electrowetting on an electro-optic material PDLC. By applying a voltage across the PDLC film, dual phenomena, EWOD and electro-optic effects, were achieved. The proposed droplet manipulating device would be beneficial when light regulation is necessary.
Electrowetting on polymer dispersed liquid crystal
(2009-04-20)
Fan, Shih-Kang
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Chiu, Cheng-Pu
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Lin, Jing-Wei
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材料科學與工程學系奈米科技碩博班
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Graduate Program of Nanotechnology , Department of Materials Science and Engineering
Polymer dispersed liquid crystal (PDLC) is used as a dielectric layer in electrowetting. By applying voltage between a liquid droplet and the electrode underlying PDLC, electrowetting occurs at the liquid/PDLC interface accompanied with electro-optic responses of the reoriented LC droplets embedded in PDLC. Two basic experiments investigating the electrowetting by sessile water droplets and the electro-optic effects through squeezed water droplets were design and performed. The basic functions of a liquid lens and droplet manipulations, including transporting, splitting, and merging, were demonstrated.
Enhanced droplet mixer by LDEP on spiral microelectrodes
(2007)
Chiu, Cheng-Pu
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Chen, Wen-Jung
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Fan, Shih-Kang
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材料科學與工程學系奈米科技碩博班
;
Graduate Program of Nanotechnology , Department of Materials Science and Engineering
We demonstrated a micromixer in which a liquid column was pumped in a virtual channel without channel walls by LDEP. Two droplets were first transported and joined together by EWOD actuation. The small contact area at the interface of the merged droplet and the long diffusion distance caused long mixing time by merely diffusion. A spiral-shaped LDEP electrode was designed to draw a thin liquid column from the merged droplet at the interface in order to increase the contact area and reduce the diffusion distance. Since no channel walls were required for LDEP pumping, the spiral-shaped liquid column would merge together again to form a new droplet for further analyses.
Integrated digital and analog microfluidics by EWOD and LDEP
(2006)
Lin, Yen-Chen
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Chuang, Kai-Cheng
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Wang, Tsu-Te
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Chiu, Cheng-Pu
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Fan, Shih-Kang
EWOD (electrowetting-on-dielectric) and LDEP (liquid dielectrophoresis) are investigated to provide digital and analog microfluidic functions on an integrated chip respectively. By altering the frequency of the applied voltage and the surrounding medium of a EWOD device, we found that when using off as surrounding medium and applying an AC signal similar to 100 kHz, liquid column would be drawn and follow the thin connecting lines of the EWOD driving electrodes instead of remaining on top of the center of the EWOD driving electrodes. This new phenomenon is described in this paper and is regarded as a LDEP effect. Three fundamental tools for integrated digital and analog microfluidics are developed, including a digital-to-analog converter, an analog-to-digital converter, and a valve. Combining EWOD and LDEP effects, liquids can be pumped on a virtual channel (analog microfluidics), defined by energized thin LDEP electrode lines, continuously from liquid reservoir or from a digitized droplet (digital microfluidics). On the contrary, liquids on LDEP electrodes (analog microfluldics) can also be pumped on a EWOD electrode and be digitized in droplet forms with precise volumes (digital microfluidics). EWOD and LDEP can be selectively programmed on a single chip, making integrated digital and analog microfluidics a reality.
Liquid Lenses and Driving Mechanisms: A Review
(2012)
Chiu, Cheng-Pu
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Chiang, Tsai-Jung
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Chen, Jem-Kun
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Chang, Feng-Chih
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Ko, Fu-Hsiang
In this paper, we discuss liquid lenses driven by various mechanisms. By properly designing the device structure and choosing the optimal materials, the liquid lenses offer great potential for practical uses. The driving mechanism dictates the application and performance of the liquid lenses. Here we categorize the driving mechanisms into mechanical and electrical ones. In general, mechanical driving with an elastic membrane and an external pump drives liquids in a cavity by controlling the hydraulic pressure. The mechanical driving method can be applied to most of the liquids, but the application of the electrical driving method would be limited by the conductivity or the permittivity of the liquids. Therefore, the properties of the different liquids, e. g., dielectric liquids, liquid crystal molecules, and conductive liquids, deeply affect the mechanism we may choose to realize a liquid lens. Among various electrical methods, dielectrophoresis (DEP), electrostatic forces, and electrowetting-on-dielectric (EWOD) are emphasized here for driving dielectric liquids, liquid crystal molecules, and conductive liquids, respectively. DEP deforms the liquid lenses when the permittivities are different between the liquid and the medium. Electrostatic force orients the liquid crystal molecules to follow the applied electric field. Electrowetting-driven liquid lenses change their focal lengths by altering the contact angle. Here we show the designs and the structures of liquid lenses to describe their mechanisms, performances and feasibilities. It is worth mentioning that the liquid lenses using electrowetting have been commercialized. No moving parts would be the most important reason to use electrical manipulations rather than mechanical ones. (C) Koninklijke Brill NV, Leiden, 2011
Particle chain display - an optofluidic electronic paper
(2012-11-21)
Fan, Shih-Kang
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Chiu, Cheng-Pu
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Hsu, Ching-Hsiang
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Chen, Shih-Chiang
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Huang, Li-Lin
A particle-based display medium and a driving mechanism insensitive to the charge polarity of those particles, based on the transformation of particle chains, are developed for reflective electronic paper displays. Particle chains are formed by dipole-dipole interactions between polarized particles with an appropriate electric field applied across the tested display medium, L e. the solution that regulates the light in the field of display technology, containing neutral polystyrene (PS) particles dispersed in water. Formation of the particle chains results in a large change in optical transmittance and reflectance of the display medium. The performance of the particle chain displays (PCD) was evaluated according to macroscopic (device), microscopic (particle) and optical (reflectance) points of view. A display medium (thickness 100 mu m) containing colored PS particles (3 mu m, 2.5% w/v) was polarized to display the fixed images of the directly driven electrodes and programmable images of arrayed (5 x 5) electrodes with electric fields (0.48 MV m(-1) and 0.09 MV m(-1), 500 kHz, respectively). The formation of particle chains under electric fields (0.2 MV m(-1) and 0.4 MV m(-1), 500 kHz) was observed in the microscopic images of a display medium (thickness 100 mu m) with fluorescent PS particles (5 mu m, 1%). Images recorded with a confocal microscope demonstrated the particle chains. The opacity, a common parameter serving to characterize a display medium, was derived by measuring the reflectance ratio of a black background to a white background of the display medium with varied thickness and particle concentration. The temporal response of a display medium (thickness 50 mu m) with black PS particles (3 mu m, 5%) was tested. When an electric field (0.6 MV m(-1), 500 kHz) was applied, the reflectance increased twice at the first data point in 0.7 s, attaining a contrast ratio of 2. Application of a voltage (20 s) yielded a contrast ratio of 10. The performance of a tested display medium, composed of simple PS particles and water and driven to form particle chains by polarization, is reported.
PIXEL DRIVING STRUCTURE OF DISPLAYING THREE COLORS OF PARTICLE DISPLAY AND ITS DISPLAYING COLORS METHOD
(2010-10-07)
Fan, Shih-Kang
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Chiu, Cheng-Pu
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Hsu, Ching-Hsiang
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Mo, Chi-Neng
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Chiang, Mei-Tsao
A pixel driving structure of a particle display displaying three colors and a method for displaying colors thereof are provided. The pixel driving structure includes a first substrate; a first electrode layer disposed on a surface of the first substrate; a second substrate dispoed opposite to the first substrate; a second electrode layer on the second substrate; a particle solution disposed between the first electrode layer and the second electrode layer and having a first color solution, a plurality of second color positive particles, and a plurality of third color negative particles; and an alternating/direct power supply connecting with the first and second electrode layers. A method for displaying color includes steps of applying an alternating voltage to display a first color; applying a first direct voltage to display a third color; and applying a second direct voltage to display a second color.
Reflective electronic paper display utilizing electric polarized particle chains
(2007)
Chiu, Cheng-Pu
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Huang, Po-Wen
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Fan, Shih-Kang
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Wei, Jen-Hung
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Hsu, Wensyang
We demonstrated a display technique by applying an AC field to polarize the originally evenly dispersed microparticles in liquid solution. The polarized particles would attract each other and form particle chains along the field lines. As a result, the light transmittance of the liquid can be regulated as a reflective display.
Transmittance tuning by particle chain polarization in electrowetting-driven droplets
(2010-12-01)
Fan, Shih-Kang
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Chiu, Cheng-Pu
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Huang, Po-Wen
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材料科學與工程學系
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Department of Materials Science and Engineering
A tiny droplet containing nano/microparticles commonly handled in digital micro-fluidic lab-on-a-chip is regarded as a micro-optical component with tunable transmittance at programmable positions for the application of micro-opto-fluidic-systems. Cross-scale electric manipulations of droplets on a millimeter scale as well as suspended particles on a micrometer scale are demonstrated by electrowetting-on-dielectric (EWOD) and particle chain polarization, respectively. By applying electric fields at proper frequency ranges, EWOD and polarization can be selectively achieved in designed and fabricated parallel plate devices. At low frequencies, the applied signal generates EWOD to pump suspension droplets. The evenly dispersed particles reflect and/or absorb the incident light to exhibit a reflective or dark droplet. When sufficiently high frequencies are used on to the nonsegmented parallel electrodes, a uniform electric field is established across the liquid to polarize the dispersed neutral particles. The induced dipole moments attract the particles each other to form particle chains and increase the transmittance of the suspension, demonstrating a transmissive or bright droplet. In addition, the reflectance of the droplet is measured at various frequencies with different amplitudes. (C) 2010 American Institute of Physics. [doi:10.1063/1.3516656]
Transmittance tuning by particle chain polarization in electrowetting-driven droplets
(2010-12-01)
Fan, Shih-Kang
;
Chiu, Cheng-Pu
;
Huang, Po-Wen
;
材料科學與工程學系
;
Department of Materials Science and Engineering
A tiny droplet containing nano/microparticles commonly handled in digital micro-fluidic lab-on-a-chip is regarded as a micro-optical component with tunable transmittance at programmable positions for the application of micro-opto-fluidic-systems. Cross-scale electric manipulations of droplets on a millimeter scale as well as suspended particles on a micrometer scale are demonstrated by electrowetting-on-dielectric (EWOD) and particle chain polarization, respectively. By applying electric fields at proper frequency ranges, EWOD and polarization can be selectively achieved in designed and fabricated parallel plate devices. At low frequencies, the applied signal generates EWOD to pump suspension droplets. The evenly dispersed particles reflect and/or absorb the incident light to exhibit a reflective or dark droplet. When sufficiently high frequencies are used on to the nonsegmented parallel electrodes, a uniform electric field is established across the liquid to polarize the dispersed neutral particles. The induced dipole moments attract the particles each other to form particle chains and increase the transmittance of the suspension, demonstrating a transmissive or bright droplet. In addition, the reflectance of the droplet is measured at various frequencies with different amplitudes. (C) 2010 American Institute of Physics. [doi:10.1063/1.3516656]