Abstract: The “ELECTRICAL BRUSH” is a simulation device of a brush composed by multiple conductive bristles, mounted along with the normal bristles used in normal brushes (natural or synthetic fibers). Its conductive bristles receive electrical stimuli coming from a drawing surface and determine, precisely, the coordinates (X,Y) of the point that was touched.

Abstract: There is provided an electrode apparatus (1) comprising an emission source component (12) and a reservoir (4) of active material for replenishing active material of an emission surface of the source component (12) and/or for providing active material to the source component (12). Also provided are electrode assemblies, electrical apparatus comprising these and methods of manufacturing them.

Abstract: A field emission device for use as a backlight of a liquid crystal display comprises a conductive anode having a light-emitting layer and a cathode separated from the anode by a spacer. The cathode comprises nanofiber electron emitters. For example, the nanofiber electron emitters comprise a substrate, a conductive film adhered to the substrate and a plurality of isolated, hemispheroidal nanofiber clusters that are capable of emitting electrons at high current density and low field strength.

Abstract: A field emission device for use as a backlight of a liquid crystal display comprises a conductive anode having a light-emitting layer and a cathode separated from the anode by a spacer. The cathode comprises nanofiber electron emitters. For example, the nanofiber electron emitters comprise a substrate, a conductive film adhered to the substrate and a plurality of isolated, hemispheroidal nanofiber clusters that are capable of emitting electrons at high current density and low field strength.

Abstract: A screen for a color display tube or display window has a structure of apertures in a black matrix and electro-luminescent material in the apertures. Steps in producing the screen include applying the black matrix and the electro-luminescent material, and exposing photosensitive material on the display window to light emitted by a light source and passed through a lens system and a shadow mask. The shadow mask is suspended from the display window and the lens system is positioned between the light source and the shadow mask. On the screen, the lens system realizes a microscopic light distribution of the light originating from the light source radiating towards the screen. The photosensitive material includes a bleaching dye functioning as a contrast enhancer in at least one of the process steps.

Abstract: A color display device having an electron gun, a display screen, a color selection electrode and a deflection unit. The distance between the electron beams in the x-direction is dynamically varied, whereby the distance in the deflection space decreases as the beams are deflected in at least one direction. The reduction of the distance enables the distance between the color selection electrode and the display screen to be increased in that direction. As a result, the curvature of the color selection electrode is increased, which has a positive effect on the strength and the doming and microphonic properties of the color selection electrode.

Abstract: In the manufacturing process of a screen (6), for use in a color display tube (1), a photosensitive process step, referred to as the exposure process, is used for applying the black matrix pattern and the phosphor layers to the display window (3) to form the screen (6). The robustness of this exposure process is dependent on, amongst others, the shape of the microscopic light distribution on the display window (3). It appears that in color display tubes (1) with an increased deflection angle, or in tubes with a real flat outer surface, the exposure process becomes more and more critical. According to the invention, this problem can be overcome by adding a bleaching dye to the photosensitive material used for the exposure process. This bleaching dye's action in the center of the microscopic light distribution is stronger than in the peripheral portions.

Abstract: A cathode ray tube having a tensioned shadow mask with elongated holes, i.e. holes with a length longer than 5 mm. The pattern of holes repeats itself after 5 or more rows and the relation between the number of rows after which the pattern repeats itself, the vertical pitch av and the horizontal pitch dh is given by av/dh≦n2≦8av/dh, most preferably n2≈2av/dh.

Abstract: A color cathode ray tube comprises an electron gun and a deflection unit, the electron gun being arranged in a neck portion of an envelope, and the deflection unit being arranged around the envelope. The neck portion of the envelope includes a first part in which the electron gun is arranged. Behind this first part, the neck portion narrows (the outside diameter decreases). The deflection unit is at least partly provided around this narrowed part.

Abstract: Color display device with a deflection-dependent distance between outer beams. A color display device comprises an electron gun, a display screen and a color selection electrode as well as a deflection means. The distance between the electron beams is dynamically varied, whereby the distance in the deflection space decreases as the beams are deflected in at least one direction. The reduction of the distance enables the distance between the color selection electrode and the display screen to be increased in that direction. As a result, the curvature of the color selection electrode is increased, which has a positive effect on the strength and the doming and microphonic properties of the color selection electrode.

Abstract: In a colour display tube (1), the shadow mask (13) serves as the colour selective element. The major part of the electrons emitted by the electron gun (10) are intercepted by the shadow mask (13). These electrons can be absorbed by the shadow mask (13) or they can be reflected. In the first situation, where the electrons are absorbed, the shadow mask (13) is heated as a result of which it will be deformed, leading to misregistration of the electron beams (7, 8, 9) when they impinge upon the phosphor screen (6), causing colour impurities on the colour display tube (1). This phenomenon is commonly referred to as doming. In the second situation, where the electrons are reflected, degradation of the contrast performance takes place because the reflected electrons hit the phosphor screen (6) at totally different positions, leading to the generation of stray light. Both doming and contrast performance are important for the quality of a colour display tube (1).

Abstract: A color display device comprises an electron gun, a display screen with a curved inner surface and a flat color selection electrode as well as a deflection means. The distance between the electron beams is dynamically varied, whereby the distance in the deflection space increases as the beams are deflected in at least one direction. The reduction of the distance enables the distance between the color selection electrode and the display screen to be decreased in that direction. As a result, the curvature of the inner surface of the display window is increased, which has a positive effect on the strength and weight of the display window.

Abstract: Display device comprising a display screen provided with phosphors, and coated with a spectrally selective, light-absorbing coating comprising silicon oxide and at least two dyes. The spectral transmissions for blue, green and red phosphor light are chosen to be such that the electron currents towards the blue, green and red phosphors for obtaining white D (6,500K) are substantially equal.