Tantalum capacitor

About: Tantalum capacitor is a research topic. Over the lifetime, 2432 publications have been published within this topic receiving 26709 citations.

Storage capacitor for liquid crystal display

Abstract: A storage capacitor in a liquid crystal display is provided for increasing the capacitance of the storage capacitor without substantially changing the manufacturing process, the storage capacitor including a first capacitor electrode ( 18 ), a first insulating layer ( 16 ) formed on the first capacitor electrode, a second capacitor electrode ( 14 ) formed on the first insulating layer, a second insulating layer ( 12 ) formed on the second capacitor electrode, and a third capacitor electrode ( 11 ) formed on the second insulating layer and electrically connected with the first capacitor electrode. The second capacitor electrode is electrically connected with the pixel electrode ( 10 ) of the liquid crystal display. With this configuration, the capacitance of the storage capacitor is substantially increased without reducing the aperture ratio of each pixel of a liquid crystal display.

Capacitors having dielectric regions that include multiple metal oxide-comprising materials

Abstract: Capacitors and methods of forming capacitors are disclosed, and which include an inner conductive metal capacitor electrode and an outer conductive metal capacitor electrode. A capacitor dielectric region is received between the inner and the outer conductive metal capacitor electrodes and has a thickness no greater than 150 Angstroms. Various combinations of materials of thicknesses and relationships relative one another are disclosed which enables and results in the dielectric region having a dielectric constant k of at least 35 yet leakage current no greater than 1×10 −7 amps/cm 2 at from −1.1V to +1.1V.

Recent results in the development of composites for high energy density capacitors

Abstract: The development of novel composites is ongoing in an effort to develop materials with an energy density greater than 5 J/cm3 for use in high voltage capacitors. The materials are composites initially developed to reduce the size of high power antennas. Due to their combination of a high dielectric constant and high dielectric strength, some of the original composites were directly transitioned for evaluation in high voltage, high energy density capacitors while others required modifications to reduce DC leakage current or to make other optimizations for the capacitor application. Recent testing has focused on dielectric strength testing to determine breakdown field levels during short pulse conditions. This initial work has included experiments with the methods of surface preparation and electrode application as well as modifications to the structure and chemistry of some candidate composites. Results are presented on the dielectric strength and dielectric constant of one of the candidate composite materials with various electrode structures designed to reduce field enhancements. Practical operating electric field levels are determined from an analysis of the breakdown data, and energy densities are projected for high energy density capacitor designs.

Discharge characteristics of high energy storage double layer capacitors

Abstract: The double-layer capacitor is a recent innovation that combines high surface area electrode materials with the high capacitance per unit area of the chemical double layer. Commercially available devices with a capacitance of 1500 F are now available (Matsushita, 1992). This improvement in rated capacitance has presented opportunities for the use of double layer capacitors in high power and/or high energy storage applications (Burke, 1995 and Hall, 1995). This paper examines the discharge performance characteristics of several capacitors, including both aqueous and organic electrolyte devices. A useful simplified model is assumed for the double layer capacitor, consisting of an equivalent series resistance (ESR) and a capacitor in series. Values for these two parameters are determined in this investigation under various discharge conditions, along with peak current during short circuit conditions.

Solid electrolytic capacitor with planar cathode lead

Abstract: The invention refers to a solid electrolytic capacitor, the anode and cathode leads of which are in known manner formed from a metal strip while the electrolytic capacitor per se comprises a metallic anode body which has a relatively large plane surface above which a dielectric layer and a cathode layer are stacked in that order. The cathode lead is a part formed from the metal strip and shaped as a plate having a surface that is at least as large as the plane surface of the anode body and faces the cathode layer.