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Dive into the research topics where Carl G. Powell is active.

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Featured researches published by Carl G. Powell.


Ibm Journal of Research and Development | 1992

A gray-scale addressing technique for thin-film-transistor/liquid crystal displays

Paul Matthew Alt; Carl G. Powell; Benal L. Owens; Harold Ifill

An addressing technique aliowing continuoustone color images to be rendered on thin-fllm-transistor/ilquid crystal displays having bilevel drivers Is described. The technique uses multiple subflelds per frame, with driver voltages changed synchronously with the field data. By using N bits of data per pixel, excitation Is applied to the display one bit-plane per field for N consecutive fields. The technique Is analyzed, Its benefits and limitations discussed, and experimental results presented. Up to 16 gray levels have been demonstrated with good Image quality.


Ibm Journal of Research and Development | 1998

Design and fabrication of a prototype projection data monitor with high information content

Robert Lee Melcher; Paul Matthew Alt; Derek B. Dove; T. M. Cipolla; Evan G. Colgan; Fuad E. Doany; Kunio Enami; K. C. Ho; I. Lovas; Chandrasekhar Narayan; R. S. Olyha; Carl G. Powell; Alan E. Rosenbluth; James Lawrence Sanford; Eugene S. Schlig; Raminderpal Singh; Takatoshi Tomooka; Mitsuru Uda; Kei-Hsiung Yang

A prototype 28-in.-diagonal desktop data monitor capable of displaying 2048 × 2048- pixel images has been designed, built, and evaluated. The monitor uses optical projection technology. A reflective, crystalline silicon active-matrix light valve using liquid crystal electro-optics and a digital electronic interface architecture is described. This rear-projection monitor has four million resolvable pixels, uses three light valves to achieve color, has a low-gain surface diffuser screen, and functions as a fully interactive, color personal computer monitor with motion video capability. The monitor is 20 in. deep.


Ibm Journal of Research and Development | 1998

A 10.5-in.-diagonal SXGA active-matrix display

Evan G. Colgan; Paul Matthew Alt; Robert L. Wisnieff; Peter M. Fryer; Eileen A. Galligan; William S. Graham; Paul F. Greier; Raymond Robert Horton; Harold Ifill; Leslie Charles Jenkins; Richard A. John; Richard I. Kaufman; Yue Kuo; Alphonso P. Lanzetta; Kenneth F. Latzko; Frank R. Libsch; Shui-Chih Alan Lien; Steven Edward Millman; Robert Wayne Nywening; Robert J. Polastre; Carl G. Powell; Rick A. Rand; John J. Ritsko; Mary Beth Rothwell; John L. Staples; Kevin W. Warren; J. Wilson; Steven L. Wright

A 157-dot-per-inch, 262K-color, 10.5-in.- diagonal, 1280 × 1024 (SXGA) display has been fabricated using a six-mask process with Cu or Al-alloy thin-film gates. The combination of high resolution and gray-scale accuracy has been shown to render color images and text with paperlike legibility. The low-resistivity gate metallization and trilayer-type TFTs with a channel length of 6-8 µm were fabricated with a six-mask process which is extendible to larger, higher-resolution displays. A combination of double-sided driving and active line repair was used so that open gate lines or data lines did not result in visible line defects. A flexible drive-electronics system was developed to address the display and characterize its performance under different drive conditions.


Archive | 2001

Compact optical system and packaging for head mounted display

Russell A. Budd; Derek B. Dove; Istvan Lovas; Robert Stephen Olyha; Carl G. Powell


Archive | 1979

Complex character generator

Gerald Goertzel; Carl G. Powell; Samuel C. Tseng


Archive | 1990

Error propagated image halftoning with time-varying phase shift

Ronald I. Feigenblatt; Carl G. Powell


Archive | 1974

Coupler for coupling optical energy transmitted by optical fiber to optical waveguide and method of manufacture

Paul Frederick Heidrich; Carl G. Powell


Ibm Journal of Research and Development | 1969

Efficiencies and bandwidths of intracavity acousto-optic devices

E. G. Lean; M. L. Dakss; Carl G. Powell


Archive | 1980

Method and apparatus for generating complex characters

Gerald Goertzel; Carl G. Powell; Samuel Chin-Chong Tseng


Archive | 2001

Kompaktes optisches System und Aufbau für eine am Kopf montierte Anzeige A compact optical system and structure for a head-mounted display

Russel A. Budd; Derek B. Dove; Istvan Lovas; Robert S. Oylha; Carl G. Powell

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