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P. G. Wareberg, D. I. Kennedy,
"Flat-Panel Video Resolution LED Display System",
NAECON, 1982 (Dayton, Ohio).
This system consists of a 128x128 element X~Y addressable LED array fabricated from green-emitting gallium phosphide. The LED array is interfaced with a 128x128 matrix TV camera.Associated electronics provide for seven levels of grey scale above zero.
Picture elements are on 0.008" centers resulting in a resolution of 125 lines-per-inch and a display area of approximately 1 sq. in.
The LED array concept lends itself to modular construction, permitting assembly of a flat panel screen of any desired size from 1" x l" building blocks without loss of resolution.
A wide range of prospective aerospace applications exist extending from helmet-mounted systems involving small dedicated arrays to multimode cockpit displays constructed as modular screens. High resolution LED arrays are already used as CRT replacements in military film-marking reconnaissance applications.
K. T. Burnette, A-J. Moffat, P. G. Wareberg,
"Multi-Mode Matrix Display Development",
Proceedings of SID, Vol. 21/2, 1980.
The development status of a 5x4 inch active area 64-LEDs/inch flat-panel vector-graphic display being built for aircraft flight test is described.The modular display surface construction philosophy being used is presented and the progress made in implementing this philosophy utilizing four-edge abuttable lxl inch plug-in LED modules as building blocks for the display's mosaic surface is discussed.
Design, construction, test and projected display performance data are provided relative to:
- the green 16x16 element GaP monolithic chips used to form the module surface,
- the module and its driver circuits, and
- the final display.
Present and projected requirements on vector-graphic displays intended for aircraft use are also considered
D.I. Kennedy,
"Fabrication and Properties of Gallium Phosphide Variable Color
Displays",
Microelectronics, Vol. 5, No. 2, 21, 1974.
Red and green radiative recombination centres are incorporated in GaP material grown using liquid-phase epitaxial techniques. Single p-n junction device structures based on these materials exhibit both red and green emissionbands. Device drive conditions are modified to induce a red-to-green transition and to obtain intermediate colours. Material preparation procedures and device properties are discussed, processing procedures applicable to the fabrication of monolithic arrays of multicolour devices are described, and the selection of suitable drive and addressing circuitry is reviewed.
G. MacGregor, D.I. Kennedy, P.G. Wareberg,
"Solid State Displays for CRT
Replacement in Data Annotation Systems",
IEEE-SID Conference on Display Devices and
Systems, 1974 (Washington D. C.).
This paper describes the construction and performance of solid-state data annotation displays used as replacements for a 1" CRT in airborne reconnaissance systems.The solid-state system comprises two monolithic LED displays mounted side-by-side. One display presents binary-coded-decimal information in 576 element, 58 lines-per-inch format conforming to MIL-STD-782C The second display presents an 8x8 matrix of 5x7 alphanumeric characters and has a resolution of 114 lines-per-inch.
Hybrid drive circuitry is mounted behind the displays and the system is assembled in a housing of the same dimensions as the CRT package.
Displays are fabricated from either red-emitting GaAs0.6PO.4 , yellow-emitting GaAs0.15P0.85 or green-emitting GaP.
