Abstract:
A display device includes a display screen, a surface of which is provided with an anti-reflection filter having a conducting layer having metallic particles and transparent areas. The conducting layer is provided with a transparent layer. The transparent layer has a thickness smaller than or equal to the thickness of the conducting layer. The display screen is provided with at least one electrically conducting strip having a metal layer and an adhesive layer provided with electrically conducting particles. The electrically conducting strip is in local electrical contact with the metallic particles of the anti-reflection filter via the conducting particles of the adhesive layer.
Abstract:
A display device (1) with a display window (3) provided with an anti-static, light-absorbing coating (9) on the basis of silicon dioxide comprising an electroconductive, light-absorbing pigment or dye, for example soot (carbon black). A method of providing the display window (3) with an anti-static, light-absorbing coating (9).
Abstract:
A substrate carrying a mixed organic conductive polymer coating, has a high index of refraction. On a substrate having SiO2 as a major component, the coating comprises two layers each having SiO2 as a major component. One of the layers comprises a conducting polymer, the other a material having a high index of refraction.
Abstract:
Corrosion of an aluminium film on the display screen of a display tube as a result of an electro-chemical reaction between water and aluminium is substantially prevented by providing the aluminium with an aluminium phosphate layer at the area where it adjoins the carbon particles. This may be done by rinsing or spraying the carbon particles with an at most 2% by weight phosphoric acid solution in water prior to or after providing the aluminium film.
Abstract:
In a method of manufacturing a cathode ray tube an electrically conductive coating is provided on an inner surface of the tube. The boundary of said conductive coating in the neck of the tube is sharply defined by wetting the part of the surface of the tube not to be covered with a liquid to remove the conductive material from that part of the surface up to the boundary, and then rinsing the wetted surface to remove any remainder of the conductive material.
Abstract:
A substrate carrying a mixed organic conductive polymer coating, has a high index of refraction. On a substrate having SiO2 as a major component, the coating comprises two layers each having SiO2 as a major component. One of the layers comprises a conducting polymer, the other a material having a high index of refraction.
Abstract:
The invention relates to an electron beam tube for displaying color television pictures and to a method of manufacturing same, in which a graphite suspension substantially free from alkali metal ions and comprising colloidal silicon oxide is used for making contact between the color selection electrode and the phosphor pattern on the display window. This suspension enables a method of manufacture which is simpler than the conventional methods.
Abstract:
Thermal radiation reflectivity between the upright edge of the faceplate and at least the edge portion of the shadow mask is adjusted to obtain a desired temperature stabilisation level which avoids electron beam spot misalignment, such as by having selected areas of the upright edge non-aluminized while the remainder of the upright edge together with the back of the screen have a layer of aluminium thereon. The size, shape and disposition of the selected areas are chosen to obtain an optimum ratio of aluminized and non-aluminized glass surface which will provide a desired radiation coefficient. Typically at least 35% of the upright edge remains aluminized. In addition, a material having a high radiation coefficient, such as a low melting point glass with a high lead content, may be selectively applied to a peripheral portion of the shadow mask and the adjoining mounting frame.
Abstract:
A picture display tube comprising an internal resistive layer to restrict the peak current which at the operating potential of the tube is associated with an electrical flash-over possibly occurring therein. The effective part of the resistive layer extends in the neck and over the transition from neck to cone of the envelope of the tube. The resistive layer represents a static resistance value of at most 10.sup.4 Ohm and a dynamic resistance value of at least 300 Ohm.
Abstract:
A color television display tube having color selection means connected electrically by at least one metal contact spring to a resistive layer provided on the inner surface of the envelope of the tube. A low resistance contact face is applied on the resistive layer between the spring and the layer to reduce the contact resistance therebetween, thereby reducing undesirable interference radiation transmitted by the tube.