Abstract: A light emitting diode, LED, strip (301) for the illumination of channel signs is provided. The LED strip comprises a flexible circuit board, a plurality of LEDs mounted on the circuit board, and an electrical connector for connecting the LED strip to a power supply. The LED strip is at least in part encapsulated by a flexible resin such that the LED strip is foldable. The LED strip according to the present invention is advantageous in that its length can be adjusted by folding instead of cutting, thereby retaining the waterproof encapsulation of the LED strip. Further, a method for mounting a flexible LED strip (301) in a channel sign is provided. The method comprises the steps of attaching at least one clip (302) to an interior surface (303) of the channel sign, folding back an end (304) of the LED strip, and fixating the LED strip including the folded end using the clip.

Abstract: A display tube comprises an electron source (10), a module (20) provided with a guidance cavity (25R, 25G, 25B) for guiding electrons emitted by the electron source (10) to an exit aperture (27R, 27G, 27B) of the guidance cavity (25R, 25G, 25B) and beam-shaping means (30) for forming an electron beam (EBR, EBG, EBB) from guided electrons leaving the exit aperture (27R, 27G, 27B). The electron beam (EBR, EBG, EBB) travels towards a display screen (3). The beam-shaping means (30) are arranged to change a direction in which the electron beam (EBR, EBG, EBB) leaves the guidance cavity (25R, 25G, 25B) in accordance with a predetermined application. For example, the electron beam (EBR, EBG, EBB) is deflected to realize gun pitch modulation in the electron gun of a cathode ray tube. As the electron beam is deflected near the exit aperture (27R, 27G, 27B), spot errors are reduced and the display tube has a relatively high image quality.

Abstract: The invention relates to a cathode ray tube (100) comprising an electron source (101) having a cathode (105, 106, 107) for emitting electrons, an electron beam guidance cavity (120, 121, 122) having an input and an output aperture for concentrating electrons emitted from the cathode, a first electrode being connectable to a first power supply means for applying, in operation, an electric field having a first field strength E1 between the cathode (105, 106, 107) and the output aperture so as to allow electron transport through said electron beam guidance cavity (120, 121, 122), an accelerating grid (140) unit for accelerating the electrons leaving said cavity, and a main electron lens (150) for focusing the accelerated electrons on a display screen (170). According to the invention, said accelerating grid unit (140) further comprises a plurality of grids (G3, G4, G5) together constituting a pre-focus lens.

Abstract: The present invention provides for a matrix display device (10) and related method of controlling light output from such a device employing sub-field addressing (14) and comprising determining the display load of the device (10), and further including the steps of dynamically varying the number of sub-fields available for display of an image responsive to said display load being determined (16) to be below a threshold value and advantageously employing partial line doubling and/or dithering (22,24) for at least the least significant bits of the display signal.

Abstract: A cathode ray tube comprising an electron source and an electron beam guidance cavity having an input aperture and an output aperture, wherein at least a part of the wall of the electron beam guidance cavity near the output aperture comprises an isolating material having a secondary emission coefficient &dgr;1 for cooperation with the cathode and for forming an electron source. Furthermore, the cathode ray tube comprises a first electrode which is connectable to a first voltage source for applying, in operation, an electric field with a first field strength E1 between the cathode and the output aperture. &dgr;1 and E1 have values, which allow electron transport through the electron beam guidance cavity. According to the invention, the cathode structure comprises means for reducing the spread of the energy distribution of the electrons leaving the exit aperture between the input of the cavity and the accelerating grid.