• Title/Summary/Keyword: Chip on glass

Search Result 176, Processing Time 0.028 seconds

Failure in the COG Joint Using Non-Conductive Adhesive and Polymer Bumps (감광성 고분자 범프와 NCA (Non-Conductive Adhesive)를 이용한 COG 접합에서의 불량)

  • Ahn, Kyeong-Soo;Kim, Young-Ho
    • Journal of the Microelectronics and Packaging Society
    • /
    • v.14 no.1
    • /
    • pp.33-38
    • /
    • 2007
  • We studied a bonding at low temperature using polymer bump and Non-Conductive Adhesive (NCA), and studied the reliability of the polymer bump/Al pad joints. The polymer bumps were formed on oxidized Si substrates by photolithography process, and the thin film metals were formed on the polymer bumps using DC magnetron sputtering. The substrate used was AL metallized glass. The polymer bump and Al metallized glass substrates were joined together at $80^{\circ}C$ under various pressure. Two NCAs were applied during joining. Thermal cycling test ($0^{\circ}C-55^{\circ}C$, cycle/30 min) was carried out up to 2000 cycles to evaluate the reliability of the joints. The bondability was evaluated by measuring the contact resistance of the joints through the four point probe method, and the joints were observed by Scanning Electron Microscope (SEM). The contact resistance of the joints was $70-90m{\Omega}$ before the reliability test. The joints of the polymer bump/Al pad were damaged by NCA filler particles under pressure above 200 MPa. After reliability test, some joints were electrically failed since thinner metal layers deposited at the edge of bumps were disconnected.

  • PDF

The Faulty Detection of COG Using Image Subtraction (이미지 정합을 이용한 COG 불량 검출)

  • Joo, Ki-See
    • Proceedings of KOSOMES biannual meeting
    • /
    • 2005.11a
    • /
    • pp.203-208
    • /
    • 2005
  • The CGO (Chip on Glass) to be measured a few micro unit is captured by line scan camera for the accuracy of chip inspection. But it is very sensitive to scan speed and lighting conditions. In this paper, we propose the methods to increase the accuracy of faulty detection by image subtraction. Image subtraction is detected faultiness by subtracting the image of a ' perfect ' COG from trot of the sample under tests. For image subtraction to be successful, the two images must be pre챠sely registered The two images is registered by the area segmentation pattern matching, and the result image get by operating the gradient mask image and the image to practice subtraction. A series of experimentation showed that the proposed algorithm shows substantial improvement over the other image subtraction methods.

  • PDF

A Magneto-optical Trap Below a Dielectric Coated Mirror Surface

  • Yu, Hoon;Lee, Lim;Lee, Kyung-Hyun;Kim, Jung-Bog
    • Journal of the Optical Society of Korea
    • /
    • v.13 no.2
    • /
    • pp.223-226
    • /
    • 2009
  • A Magneto-Optical Trap (MOT) for $^{87}Rb$ atoms near the surface of a dielectric coated mirror at the top of a small $20{\times}25{\times}40\;mm^3$ cell has been observed. Two beams of $3.3\;mW/cm^2$ were used for optical cooling and an anti-Helmholtz magnetic field with a spatial gradient of 9.1 G/cm was used for magnetic trapping. The thickness of the mirror coated on a cover glass was less than $100{\mu}m$. The mirror covered the top of a cell and the atom-chip was located outside the vacuum in order to exploit the long life time of the mirror and easy operation of the chip. The trapping position was found 5 mm beneath the mirror surface. The number of trapped atoms was roughly $3{\times}10^7$ atoms and the temperature was approximately a few tens mK. In this paper, we describe the construction of the mirror-MOT in detail.

The Wetting Properties of UBM-coated Si-wafer to the Lead-free Solders in Si-wafer/Bumps/Glass Flip-Chip Bonding System

  • Hong, Soon-Min;Park, Jae-Yong;Park, Chang-Bae;Jung, Jae-Pil;Kang, Choon-Sik
    • Proceedings of the International Microelectronics And Packaging Society Conference
    • /
    • 2000.04a
    • /
    • pp.74-79
    • /
    • 2000
  • In an attempt to estimate the wetting properties of wettable metal layers by wetting balance method, an analysis of wetting curves of the coating layer was performed. Based on the analysis, wetting properties of UBM-coated Si-plate were estimated by the new wettability indices. The wetting curves of the one and both sides-coated UBM layers have the similar shape and show the similar tendency to the temperature. So the wetting property estimation of one side coating is possible with wetting balance method. For UBM of Si-chip, Cr/Cu/Au UBM is better than Ti/Ni/Au in the point of wetting time. At general reflow temperature, the wettability of high melting point solders(Sn-Sb, Sn-Ag) is better than that of few melting point ones(Sn-Bi, Sn-In).The contact angle of the one side coated plate to the solder can be calculated from the farce balance equation by measuring the static state force and the tilt angle.

  • PDF

Detection of rpoB Gene Mutation in Rifampin-Resistant M. Tuberculosis by Oligonucleotide Chip (Oligonucleotide chip을 이용한 Rifampin 내성 결핵균의 rpoB 유전자 돌연변이 검출)

  • Park, Soon-Kew;Lee, Min-Ki;Chung, Byung-Seon;Kim, Cheol-Min;Chang, Chul-Hun L.;Park, Hee-Kyung;Jang, Hyun-Jung;Park, Seung-Kyu;Song, Sun-Dae
    • Tuberculosis and Respiratory Diseases
    • /
    • v.49 no.5
    • /
    • pp.546-557
    • /
    • 2000
  • Background : Oligonucleotide chip technology has proven to be a very useful tool in the rapid diagnosis of infectious disease. Rifampin resistance is considered as a useful marker of multidrug-resistance in tuberculosis. Mutations in the rpoB gene coding $\beta$ subunit of RNA polymerase represent the main mechanism of rifampin resistance. The purpose of this study was to develop a diagnosis kit using oligonucleotide chip for the rapid and accurate detection of rifampin-resistance in Mycobacterium tuberculosis. Method : The sequence specific probes for mutations in the rpoB gene were designed and spotted onto the glass slide, oligonucleotide chip. 38 clinical isolates of Mycobacterium were tested. A part of rpoB was amplified, labelled, and hybridized on the oligonucleotide chip with probes. Results were analyzed with a laser scanner. Direct sequencing was done to verify the results. Result : The low-density oligonucleotide chip design어 to determine the specific mutations in the rpoB gene of M. tuberculosis accurately detected rifampin resistance associated with mutations in 28 clinical isolates. Mutations at codons 531, 526, and 513 were confirmed by direct sequencing analysis. Conclusion : Mutant detection using oligonucleotide chip technology is a reliable and useful diagnostic tool for the detection of multidrug-resistance in M. tuberculosis.

  • PDF

Manufacturing Protein-DNA Chip for Depigmenting Agent Screening (전사인자 저해제 통한 미백제 탐색용 단백질 칩 제작)

  • Han Jung-Sun;Kwak Eun-Young;Lee Hyang-Bok;Shin Jlung-Hyun;Baek Seung-Hak;Chung Bong-Hyun;Kim Eun-Ki
    • Journal of the Society of Cosmetic Scientists of Korea
    • /
    • v.30 no.4 s.48
    • /
    • pp.479-483
    • /
    • 2004
  • An attempt was made to develop a proteinchip for screening of MITF (microphthalmia transcription factor) inhibitor. Binding of MITF to E-box causes transcription of several pigmenting genes including tyrosinase gene. We investigated binding of MITF and its DNA binding site (E-box) using a protein-DNA chip with various detection methods including flurorescence (Cyt3). SPR (surface plasmon resonance) and SPRi (surface plasmon resonance imaging). A fusion protein (MITF-Maltose Binding Protein) was attached on the glass plate by chemical modification. An inhibitory synthetic DNA oligomer, artificially designed based on the E-box sequence, inhibited the binding of MITF and E-box. These results showed the potentials of flurorescence-based MITF protein chip as a microarray for high throughput screening (HTS) system of depigmenting agents.

Laser Thermal Processing System for Creation of Low Temperature Polycrystalline Silicon using High Power DPSS Laser and Excimer Laser

  • Kim, Doh-Hoon;Kim, Dae-Jin
    • 한국정보디스플레이학회:학술대회논문집
    • /
    • 2006.08a
    • /
    • pp.647-650
    • /
    • 2006
  • Low temperature polycrystalline silicon (LTPS) technology using a high power laser have been widely applied to thin film transistors (TFTs) for liquid crystal, organic light emitting diode (OLED) display, driver circuit for system on glass (SOG) and static random access memory (SRAM). Recently, the semiconductor industry is continuing its quest to create even more powerful CPU and memory chips. This requires increasing of individual device speed through the continual reduction of the minimum size of device features and increasing of device density on the chip. Moreover, the flat panel display industry also need to be brighter, with richer more vivid color, wider viewing angle, have faster video capability and be more durable at lower cost. Kornic Systems Co., Ltd. developed the $KORONA^{TM}$ LTP/GLTP series - an innovative production tool for fabricating flat panel displays and semiconductor devices - to meet these growing market demands and advance the volume production capabilities of flat panel displays and semiconductor industry. The $KORONA^{TM}\;LTP/GLTP$ series using DPSS laser and XeCl excimer laser is designed for the new generation of the wafer & FPD glass annealing processing equipment combining advanced low temperature poly-silicon (LTPS) crystallization technology and object-oriented software architecture with a semistandard graphical user interface (GUI). These leading edge systems show the superior annealing ability to the conventional other method. The $KORONA^{TM}\;LTP/GLTP$ series provides technical and economical benefits of advanced annealing solution to semiconductor and FPD production performance with an exceptional level of productivity. High throughput, low cost of ownership and optimized system efficiency brings the highest yield and lowest cost per wafer/glass on the annealing market.

  • PDF

A Study on Ni Electroless Plating Process for Solder Bump COG Technology (COG용 Solder Bump 제작을 위한 Ni 무전해 도금 공정에 관한 연구)

  • Han, Jeong-In
    • Korean Journal of Materials Research
    • /
    • v.5 no.7
    • /
    • pp.794-801
    • /
    • 1995
  • To connect the driver IC and Al coated glass, a method has been developed to plate electrolessly Ni on Al/PR system. It Is necessary to pretreat Al to remove oxide film before plating. In order to find pretreatment process which does not damage photoresist or glass, alkaline and fluoride zincate process have been investigated. Because photoresist and aluminum thin film can easily dissolve in alkaline solution, it is considered that the fluoride zincate process was a suitable one. After immersion in the zincate solution containing 1.5 g/$\ell$ ammonium bifluoride and 100 g/$\ell$ zinc sulfate, electroless nickel plating could be performed. The additive in the zincate solution and thiourea in the plating solution increased smoothness of the plated surface. Acld dip could improve the uniformit of the surface.

  • PDF

Novel Fabrication of Designed Silica Structures Inspired by Silicatein-a

  • Park, Ji-Hun;Kwon, Sun-Bum;Lee, Hee-Seung;Choi, In-Sung S.
    • Proceedings of the Korean Vacuum Society Conference
    • /
    • 2012.02a
    • /
    • pp.557-557
    • /
    • 2012
  • Silicatein-${\alpha}$, the enzyme extracted from silica spicules in glass sponges, has been studied extensively in the way of chemistry from 1999, in which the pioneering work by Morse, D. E. - the discovery of the enzymatic hydrolysis in Silicatein-${\alpha}$ - was published. Since its reaction conditions are physiologically favored, synthesis of various materials, such as gallium oxide, zirconium oxide, and silicon oxide, was achieved without any hazardous wastes. Although some groups synthesized oxide films and particles, they have not achieved yet controlled morphogenesis in the reaction conditions mentioned above. With the knowledge of catalytic triad involved in hydrolysis of silicone alkoxide and oligomerization of silicic acid, we designed the novel peptide amphiphiles to not only form self-assembled structure, but also display similar activities to silicatein-${\alpha}$. Designed templates were able to self-assemble into left-handed helices for the peptide amphiphiles with L-form amino acid, catalyzing polycondensation of silicic acids onto the surface of them. It led to the formation of silica helices with 30-50 nm diameters. These results were characterized by various techniques, including SEM, TEM, and STEM. Given the situation that nano-bio-technology, the bio-applicable technology in nanometer scale, has been attracting considerable attention; this result could be applied to the latest applications in biotechnology, such as biosensors, lab-on-a-chip, biocompatible nanodevices.

  • PDF

Construction and Characterization of the Stainless Steel Isolated Type Semiconductor Pressure Sensor (스테인레스 봉입형 반도체 압력센서의 제작 및 그 특성)

  • Kim, Woo-Jeong;Cho, Yong-Soo;Hwang, Jung-Hoon;Choi, Sie-Young
    • Journal of Sensor Science and Technology
    • /
    • v.11 no.3
    • /
    • pp.138-144
    • /
    • 2002
  • The silicon piezoresistive pressure sensor is made by semiconductor process to obtain stainless steel isolated type pressure sensor. The sensor is loaded on a stainless steel housing with glass molding, $50\;{\mu}m$ stainless steel thin film is welded, and the stainless steel housing encapsulated by silicone oil. The performance of fabricated the pressure sensor has 10 bar pressure range. The XTR105 of exclusive transmitter chip is used the pressure transmitter that output current is 4 - 20 mA. The accuracy is ${\pm}5%$ FS, however, the accuracy is ${\pm}1%$ FS when the sensor is compensated temperature.