Papers by Author: P.S. Pa

Abstract: The low yield rate of ITO thin-films is well known in semiconductor production processes. In the current study, an electrode sets with a cylindrical cathode and a platy anode as a reclamation process for the nanoscale removal of the indium tin oxide (ITO) nanostructure from the color filter surface of TFT-LCD displays is presented. In the current experiment, the major interest lies in the features of the technology and the design of the cylindrical cathode and the platy anode for the electrochemical etching process. For this process a steep gradient of the platy anode provides large discharge mobility and a better removal effect. A thin platy anode, a small gap-width between the cylindrical cathode and the ITO surface, or a high flow rate of electrolyte corresponds to a higher removal rate of the ITO-layer. A large current flow combined with a high feed rate of the display also results in a fast removal rate. By establishing a recycling process for the ultra-precise removal of the thin-film nanostructure, the optoelectronic semiconductor industry can effectively recycle defective products with a reduction of both production costs and pollution.

Abstract: A newly designed arc-form shaped tool was used to carry out precise micro electrochemical etching (MECE) to remove Indium-tin-oxide (In2O3SnO2) thin-film nanostructures from the optical PET diaphragm surfaces for digital-paper surface. For this precise removal process, a higher current with a faster feed rate of the optical PET diaphragm effectively achieved rapid material removal. A pulsed direct current can improve dregs discharge and is advantageous when associated with fast PET feed rates, but this raises the total current required. A higher temperature or flow velocity of the electrolyte corresponds to a higher removal rate of the In2O3SnO2 nanostructures. A high rotational speed of the arc-form shaped tool corresponds to a higher removal rate of In2O3SnO2. A large cathode, along with a small gap-width between the cathode and the PET diaphragm, increases In2O3SnO2 removal rates. A thin cathode, or a short arc length of the arc-form anode, reduces the time taken for In2O3SnO2 removal.

Abstract: A major problem for the implementation of microelectroremoval is the cost and the design of the tool electrode. An effective nanoscale processing for yield improvement was developed using microelectroremoval and a designed twin-cylinder tool as a precision reclamation retrieval system to remove the defective indium tin oxide (ITO) thin-film nanostructures from the optical PET surfaces of digital paper. By establishing a recycling process using the ultra-precise removal of nanostructures, the optoelectronic semiconductor industry can effectively recycle defective products, minimizing both production costs and pollution. In the current experiment, small thickness of the anode, combined with enough electric power and provided a larger discharge space, and better removal effect. A large diameter of the cylinder acthode accompanied by a small gap-width between the cathode and the workpiece, takes less time to do the same amount of ITO removal. A higher rate of removal of the defective ITO nanostructures corresponds to high temperature, a large electrolyte flow rate with a high rotational speed of the electrodes. A faster feed rate of color filters combined with a higher electric current produces a fast removal rate. A small edge angle of the anode also provides higher current density, which is advantageous for ITO removal.

Abstract: A bluge rotational tool has been developed as an effective precision electrochemical removal for the thin film nanostructures from LCD panels. This ultra-precise process effectively removes defective Indium-Tin-Oxide layers allowing LCD panels to be returned to the production line and significantly reduces costs. In the current experiment a 7th Generation TFT-LCD panel was used. A high rotational speed of the cheek rotational tool elevates discharge mobility and improves the removal effect. A negative electrode of large diameter with a small end radius provides higher current density and also improves the removal affect. Pulsed direct current can improve the effect of dregs discharge and is advantageous when combined with a higher electric power. A fast feed combined with a high current flow results in very effective removal of the color filter layer. This novel design using electrochemical removal as a precision recycling process for removing ITO layers from LCD panels is clean, effective and very fast.

Abstract: This study using ultrasonic energy transmitted into the electrolyte to assist in discharging of electrolytic product out of the machining gap in the compound finishing processes of grinding and electropolishing on hole-wall surface beyond traditional process of holes machining instead of conventional hand or machine polishing. The compound processes of grinding and ultrasonic electro polishing just require a short time to make the hole-wall surface smooth and bright in the current study. The design polishing tool includes a grinding-tool and an electrode as a hole-wall surface finish improvement that goes beyond traditional rough boring. In the experiment, the polishing tool travels across the hole-wall surface with continuous or pulsed direct current. The experimental results show that the large supply of current rating is effectively to reach the amount of the material removal and is advantageous to the finishing processes. The average effect of the ultrasonic is better than the pulsed current while the machining time needs not to be prolonged by the off-time. The finish effect is better with a high rotational speed of the polishing tool because the dregs discharge of electrochemical finishing becomes easier and is also advantageous to the finish.