Abstract: A filter screen for a video display terminal is formed by ablating a sheet of plastic material with an excimer laser beam to produce desired apertures in the sheet spaced by webs of the sheet material. The filter screen formed in this manner can produce clean cut apertures in the sheet material and the retained material or webs between the apertures can be reduced to small dimensions because of the control of the laser beam. The sheet material can be coated for optical reflection control and for radiation control either before or after formation as the filter screen. The filter screen and the method for its formation is disclosed.

Abstract: A removable conforming video display terminal filter is disclosed. The combination of a filter element and a filter bezel is adapted to be added to a video display terminal that does not have an installed filter. The filter and bezel are adapted to be mounted to the terminal without opening the enclosure of the terminal. The filter conforms to the face of the cathode ray tube and the bezel presses the filter against the face. The filter bezel may be adapted with hanger means that permit the filter and bezel to be removably attached to the terminal. The filter is capable of reducing or eliminating both glare and radiation from the terminal and the filter is adapted to be grounded to a suitable ground circuit.

Abstract: A combined glare and radiation and static electricity suppression device, for use on the face of a cathode ray tube, consisting of an opaque, conductive mesh, and a spherical frame which is preformed to the same curvature as the cathode ray tube and serves to conform the mesh to the tube and hold the device in place. The frame is painted with a conductive paint on the side where the mesh is bonded to the frame. The bonding is done using a solvent which softens the paint without affecting the conductive contact between the paint and the mesh. A grounding connection is connected to the conductive side of the frame to a grounding point on the assembly including the cathode ray tube. The mesh, when grounded, minimizes static field build-up and significantly reduces the electric component of electromagnetic radiation emanating from the cathode ray tube and passing through the front of the tube. The device is also effective to reduce glare from illumination from in front of the tube.

Abstract: A coordinate sensing device uses electric currents to energize a conducting member which has a major surface and preferably is made of mesh material. Electrical currents are sequentially applied to create alternate noncoincident electrical fields so that when a probe is applied to the surface, the obtained electrical potentials can be compared to a reference potential. The resulting potential differences may then be conveniently converted to appropriate signals. The conducting member is not limited as to shape or construction; hence, it may also act as an anti-glare device for a cathode-ray tube. The fields created by the electrical currents need not be uniform.

Abstract: An anti-glare device for the display tube of a computer terminal or other video display tube wherein illuminated messages or images are presented on a highly reflective surface, comprising a microweave screen of fine black filaments in a fine mesh mounted in a flexible frame so that the screen conforms to and maintains contact with, the display tube. The frame is secured so that the screen covers the terminal tube, and substantially conforms to the surface thereof. The filaments are preferably approximately 0.0025 inch in diameter and there are approximately 150 filaments per inch.