Patent Application
20050248254
This invention relates generally to luminescent display devices and to a method of manufacturing same. More particularly, the invention relates to gas plasma display devices.
It is well known to produce light by passage of electricity through gases. This phenomenon has been used in lighted signs which display numerals, characters, symbols, graphics and the like, such as neon signs for example. Gases commonly used for this purpose are neon, argon, mercury vapour, or mixtures thereof.
U.S. Pat. Nos. 5,383,295, 5,126,632, 5,281,898 and 4,403,831 disclose various conventional display devices. U.S. Pat. No. 6,512,331 issued to the applicant herein discloses a luminous display device and a method of making the same in which a front member of transparent glass is fused to the rim area of a rear member having a recess therein and protuberances projecting from the base of the recess toward the front member. The protuberances are closely spaced with respect to each other and the front member to provide passages between the protuberances and a light discharge member between the front member and the recess. An opening extends through the rear member communicating with the chamber. A tubular member mounted on the rear member communicates with the opening for evacuating the chamber and filling it with an ionizable gas. An electrode device is mounted in the tubular member and is operatively connected to a power source for ionizing the gas in the chamber thereby producing light discharge fingers or streaks through the passages providing the desired display of light. The rear member is moulded to form the recess and protuberances integral therewith thus minimizing the number of parts of the display device. The content of U.S. Pat. No. 6,512,331 is fully incorporated herein by reference.
As the closely spaced protuberances in the device in U.S. Pat. No. 6,512,331 do not provide a pre-defined passage(s) along which the light discharge fingers or streaks are produced, but intersticial passages along which the light discharge fingers or streaks may be produced, neither the manufacturer nor the user can determine the light patterns produced by such a display, and in fact the light patterns generated by such a display are random and always differ.
It is thus an object of the present invention to provide a luminous display device and a method of manufacturing same in which the aforesaid shortcoming is mitigated, or at least to provide a useful alternative to the public.
It is a further object of the present invention to provide a luminous display in which pre-defined light pattern(s) can be produced upon activation of the display.
According to a first aspect of the present invention, there is provided a luminous display device comprising a non-opaque first member having a rear surface; a second member having a front side, a rear side, and at least a first trough member extending along at least part of said front side of said second member to form at least a first pre-defined pattern; wherein said rear surface of said first member is in fused sealing relationship with said front side of said second member to thereby form at least a first sealed discharge chamber between said first trough member and said first member; an ionizable gas filling said chamber; and at least a first opening in one of said first and second members having a first end communicating with said first chamber and a second end communicating with an electrode means, said electrode means being energizable to ionize said gas in said first chamber to produce light discharge of said at least first pre-defined pattern.
According to a second aspect of the present invention, there is provided a method of making a luminous display device, comprising the steps of providing a non-opaque first member having a rear surface; moulding a second member with a front side, a rear side, and at least a first trough member extending along at least part of said front side of said second member to form at least a first pre-defined pattern; fusing said rear surface of said first member with said front side of said second member to form at least a first sealed discharge chamber between said first trough member and said first member; producing at least a first opening in one of said first and second members having a first end communicating with said first chamber; evacuating said first chamber through said first opening; filling said first chamber through said first opening with an ionizable gas; and installing electrode means in communication relationship with a second end of said first opening, wherein said electrode means is energizable to ionize said gas in said first chamber to produce light discharge of said at least first pre-defined pattern.
Preferred embodiments of the present invention will now be described, by way of examples of only, with reference to the accompanying drawings, in which:
In a first embodiment according to the invention, as shown in
During assembly of the luminous display 100, the lower surface of the top body part 102 is fused together with the upper surface 108 of the bottom body part 104 to form a chamber between the recess 106 and the lower surface of the top body part 102, leading on each side to one of the two exhaust holes 110. Air in the chamber is then evacuated through one or both of the exhaust holes 110. The chamber is then filled, again through one or both of the exhaust holes 110, with an ionizable gas, e.g. neon, argon, mercury vapour, or mixtures thereof. An electrode 112 is then installed at and in communication with a respective exhaust holes 110. The chamber formed between the recess 106 of the bottom body part 104 and the upper body part 102 is thus sealed. When the electrodes 112, which are connected to an electrical power source, are energized to ionize the gas in the chamber, a coloured light discharge in the shape of the pre-defined pattern will be generated.
The colour of the light discharge will depend in part on the ionizable gas filled in the chamber. Different types of phosphor coatings may also be applied on different parts of the recess 106 so that different colours will be shown upon ionization of the gas. Pre-defined multi-colour patterns may thus be generated upon ionization of the gas.
In a second embodiment according to the invention, as shown in FIGS. 3 to 5, a luminous display 200 includes a top body part 202, an intermediate body part 203 and a bottom body part 204. As in the case of the luminous display 100 discussed above, the top body part 202 is made of a non-opaque material, and has substantially flat upper and lower surfaces. As to the intermediate body part 203, and as shown in more detail in
During assembly of the luminous display 200, the lower surface of the top body part 202 is fused together with the upper surface 208 of the intermediate body part 203. The lower surface of the intermediate body part 203 is then fused together with the upper surface of bottom body part 204, with the through holes 212 in communication with the openings 210, so as to form a chamber, leading on each side to a respective through hole 212. Air in the chamber is then evacuated through one or both of the through holes 212. The chamber is then filled, again through one or both of the through holes 212, with an ionizable gas. An electrode 214 is then installed at and in communication with a respective through hole 212. The chamber formed between the recess 206 of the intermediate body part 203, the upper body part 202 and the upper surface of the bottom body part 204 is thus sealed. When the electrodes 214 are energized to ionize the gas in the chamber, a coloured light discharge in the shape of the pre-defined pattern will be generated.
In a third embodiment according to the invention, as shown in FIGS. 6 to 8, a luminous display 300 includes a top body part 302, an intermediate body part 303 and a bottom body part 304. The top body part 302 is made of a non-opaque material, and has substantially flat upper and lower surfaces. As shown in more detail in
During assembly of the luminous display 300, the lower surface of the top body part 302 is fused together with the upper surface 308 of the intermediate body part 303 to form a first chamber. The lower surface of the intermediate body part 303 is then fused together with the upper surface of bottom body part 304, with the through hole 310a in communication with the through hole 320a, and the through hole 310b in communication with the through hole 322. Air in the chamber is then evacuated through one or both of the through holes 320b, 322. The chamber is then filled, again through one or both of the through holes 320b, 322, with an ionizable gas. An electrode 314 is then installed at and in communication with a respective through hole 320b, 322. The chamber formed between the recess 306 of the intermediate body part 303, the upper body part 302, the lower surface of the intermediate body part 303, and the recess 316 of the lower body part is thus sealed. When the electrodes 314 are energized to ionize the gas in the chamber, two coloured light discharges in the shape of two pre-defined patterns will be generated. The two pre-defined coloured patterns, i.e. one of a spider and one of a spiral, will be shown upon activation of the electrodes 314. The two coloured patterns are each of a different distance from the upper surface of the top body part 302, thus creating an overall three-dimensional pattern.
In a fourth embodiment according to the invention, as shown in
In a fifth embodiment according to the invention, as shown in
In a sixth embodiment according to the invention, as shown in
It should be understood that the above only illustrates and describes examples whereby the present invention may be carried out, and that modifications and/or alterations may be made thereto without departing from the spirit of the invention. For example, the body parts may be curved in shape, e.g. undulating, or in a wave shape.
It should also be understood that certain features of the invention, which are, for clarity, described in the context of separate embodiments, may also be provided in combination in a single embodiment. Conversely, various features of the invention which are, for brevity, described in the context of a single embodiment, may also be provided or separately or in any suitable sub-combination.
