Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1993-07-02
1996-10-15
Issing, Gregory C.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
313257, 313422, G09G 104, H01J 188, H01J 2970
Patent
active
055657427
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates in general to electronic fluorescent display devices and in particular, to an improved low voltage cathodoluminescent device particularly useful for full color hang-on-wall type displays.
Researchers in many flat panel display technologies, such as LCD, PDP, EL, LED, VFD, flat CRT, have been trying to develop a full-color hang-on-wall television. Color televisions of several inch to ten inch screens using LCD technology have been produced. Such televisions using LCD employ a large number of thin film transistors on their basic boards and are expensive. Because of difficulty of manufacture, it is difficult to further increase the size of the basic board and of the television screen of such products. LCD televisions employ a back illumination scheme. The basic board with thin film transistors transmits a low proportion of light from a light source and this limits the brightness of the display. Because of these difficulties, in order to develop larger color televisions using LCD technology, research in this area is primarily focused on projection televisions.
Color televisions using PDP technology is still in the research stage and at this point, color televisions of twenty inch screen have been proposed. The main problems in the development of PDP type color televisions include its low efficiency in phosphorescence, its complicated drive circuitry, unevenness in brightness and short product life. Research in LED, EL still has not been able to develop luminescent elements for blue lights. While multi-color displays have been developed using VFD, such devices are limited to smaller television screens. Furthermore, aside from the use of luminescent elements using zinc oxide and zinc for generating blue-green light, the brightness, efficiency and product life of other color phosphors are still not satisfactory. From the above, it will be evident that large-screen flat full-color hang-on-wall televisions that have been proposed using any of the existing flat panel display technologies are not entirely satisfactory.
Cathode ray tubes (CRT) have been used for display purposes in general, such as in conventional television systems. The conventional CRT systems are bulky primarily because depth is necessary for an electron gun and an electron deflection system. In many applications, it is preferable to use flat display systems in which the bulk of the display is reduced. In U.S. Pat. No. 3,935,500 to Oess et al., for example, a flat CRT system is proposed where a deflection control structure is employed between a number of cathodes and anodes. The structure has a number of holes through which electron beams may pass with sets of X-Y deflection electrodes associated with each hole. The deflection control structure defined by Oess et al. is commonly known as a mesh-type structure. While the mesh-type structure is easy to manufacture, such structures are expensive to make, particularly in the case of large structures.
Another conventional flat panel system currently used is known as the Jumbotron such as that described in Japanese Patent Publication Nos. 62-150638 and 62-52846. The structure of Jumbotron is somewhat similar to the flat matrix CRT described above. Each anode in the Jumbotron includes less than 20 pixels so that it is difficult to construct a high phosphor dot density type display system using the Jumbotron structure.
Both the flat matrix CRT and Jumbotron structures are somewhat similar in principle to the flat CRT system described by Oess et al. discussed above. These structures amount to no more than enclosing a number of individually controlled electron guns within a panel, each gun equipped with its own grid electrodes for controlling the X-Y addressing and/or brightness of the display. In the above-described CRT devices, the control grid electrodes used are in the form of mesh structures. These mesh structures are typically constructed using photo-etching by etching holes in a conductive plate. The electron beams originating from the cathodes of th
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Lam Victor
Liang Jemm Y.
Shichao Ge
Issing Gregory C.
Panocorp Display Systems
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