Patent Application
20070046959
1. The invention relates to the art of pixels and their fabrication in a printable color display panel.
2. The prior art sets forth a number of technologies capable of providing, through one or more means, a multi-color display panel, these technologies as follows:
1. Liquid crystal diode or display (LCD).
2. Plasma display panel (PDP).
3. Light-emitting polymers (LEP).
4. Other semi-conductive materials including field effect transistor systems.
5. Organic electro-luminescent (EL) displays.
6. Rigid crystal displays.
Patent representatives of Category 1 above are as follows:
LCD displays (Category 2) are well-known and are, inter alia, represented by such art as U.S. Patent Application Pub. 2004/0201551 to Suzuki, entitled Matrix Type Display Apparatus,
Prior art representative of Category 3, that is, Light Emitting Polymers is as follows:
Other semi-conductive materials (Category 4 above) are reflected in such art as U.S. Pat. No. 6,724,511 to Gudesen, entitled Matrix-Addressable Opto-Electronic Apparatus.
Category 5 above, namely, EL displays, is represented by the following art:
Category 6, that is, the use of rigid crystals in a display panel is reflected in U.S. Pat. No. 6,784,610 B2 (2004) to Ellis, entitled Display Panel Apparatus and Method. Ellis teaches the use of a matrix of carbon fibers to activate stacks of rigid crystals. Each carbon fiber acts as an emitter in a cell formed within three emulsion layers of a micro-crystal stack positioned vertically one atop another. Ellis, unlike Applicant's invention set forth herein, requires use of a multiplicity of carbon fibers within each emulsion layer of the nano-crystal stack. The structure and method of Ellis is, as well, not particularly adapted for use with printed micro-circuitry as is the case in present invention, as more fully described below.
The instant invention also differs from the art set forth above in that its display layer is that of a gel, i.e., a colloid having a dispersion phase which is dispersed throughout a dispersion medium, as opposed to the use of crystals, diodes, other semi-conductors, or polymers, as taught in the art. Certain of the prior art, e.g., the EL displays of Category 5 above could be employed either at said dispersion phase or as said dispersion medium within a gel as defined and set forth within the context of the invention which includes a new use of a high density carbon fiber as a charge of current input to an EL electronic gel in the manner set forth herein.
The inventive display structure includes a sub-pixel for use in a color pixel structure, the sub-pixel comprising microwire preferably printed on a substrate, said microwire having a gap therein and a high density carbon filament spanning said gap and having opposite ends of said filament in electrical communication with said wire; and an electro-optic or EL gel having a tint of one primary color of a white light spectrum, said gel enveloping said carbon filament. Each of said components of the sub-pixel is preferably encapsulated within an electrically inert material such a silicone.
Using such a sub-pixel, a color pixel structure, for use within an addressable color display matrix, may comprise a first planar EL or electro-optical sub-pixel including a first gel having a tint of a first primary color; means for furnishing an electron input to said first EO sub-pixel; a second planar EL or EO sub-pixel including a gel having a tint of a second primary color, said second sub-pixel substantially congruent in shape and area with said first sub-pixel and positioned in optimal proximity thereto; means for furnishing an electron input to said second sub-pixel; a third planar sub-pixel including a gel having a tint of a third primary color in substantially congruent overlay with said first and second sub-pixels and positioned in optimal proximity to both; means for furnishing an electron input to said third sub-pixel; and means for defining a ratio of relative electron input of said respective three electron furnishing means, to each respective sub-pixel to thereby produce a chromatic value of the composite optical output of all three sub-pixels specific to a particular ratio of primary colors effected by said ratio of electron inputs to each respective sub-pixels.
It is an object of the present invention to provide a sub-pixel of which may be formed a pixel, in which a gel of each respective sub-pixel is provided with a tint of a different color of a white light spectrum.
It is another object to provide a pixel of the above type with which an addressable color pixel circuit may be printed upon substrate, each pixel joined by appropriate printer microwire circuitry, to produce a high definition color display screen.
It is another object of the invention to provide a pixel of the above type printed as a part of an addressable pixel matrix upon either a hard or flexible surface.
It is a yet further object to provide a color pixel circuit using my inventive structure of pixels to produce low cost high definition color displays.
The above and yet other objects and advantages of the present invention will become apparent from the hereinafter set forth Brief Description of the Drawings, Detailed Description of the Invention and Claims appended herewith.
Historically, the element carbon has been viewed as an insulator having no, if any other electrical property. However, recent technical developments have made possible the creation of so-called carbon fibers or filaments which are formed out of long, thin sheets of carbon similar in nature to graphite. A common method of making carbon filaments is the oxidation and pyrolysis of polyacrylonitrile (PAN), a polymer used in the creation of many synthetic materials in the correct fashion (see http\\www.psrc.usm.edu/macrog/carfsyn.htm). Chains of PAN bonds are tied-to-side fashion to narrow bands of graphite which eventually merged to form a single jelly-like roll shaped format which is usually about 95% elemental carbon. These filaments are typically in a range of 20-50 microns in cross-section and can be long and continuous, short and fragmented, or may be directionally or randomly oriented. Short fibers, of the type employed as filaments in the within invention, have the lowest cost of fabrication. Each length of carbon fiber so fabricated is about 300 microns, but may be as great as 3,000 microns. A typical length/diameter ratio is 30, meaning that a carbon fiber having a diameter of 35 microns will have a length of about 1,000 microns. Other thinner fibers having a length-diameter of up to 800 may also be formed. Such fibers possess characteristics which differ from almost all other materials. That is, the linear expansion co-efficient of such of carbon fibers in the range of 30 million-psi modulus fibers to approximately −1.3×10(6) each/inch—F for ultra-high modulus fibers. This property makes possible the design of structures with zero or very low linear and planar expansion, a valuable characteristic for components in precision instruments and circuitry. High modulus carbon fibers exceed the thermal conductivity of copper. When density differences are considered, the specific thermal conductivity of carbon fibers can be as much as 8 times that of copper. This is of course counter-intuitive given carbon's history of use as an insulator. The instant invention is, in part, predicated upon the discovery that such carbon fibers, particularly high density carbon fibers possess conductive properties and as an electron emitter as, for example, is taught in the specification of U.S. Pat. No. 6,784,610 B2 (2004) to Ellis. This invention however relates to a different application of these properties of carbon fibers as an electron emitter, more fully set forth below.
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It should also be appreciated that carbon fibers may, in another embodiment, be printed over microwires 10/20/30 as is shown in
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While there has been shown and described the preferred embodiment of the instant invention it is to be appreciated that the invention may be embodied otherwise than is herein specifically shown and described and that, within said embodiment, certain changes may be made in the form and arrangement of the parts without departing from the underlying ideas or principles of this invention as set forth in the Claims appended herewith.
