Chemistry: electrical and wave energy – Processes and products – Coating – forming or etching by sputtering
Reexamination Certificate
1999-10-15
2001-05-08
Diamond, Alan (Department: 1753)
Chemistry: electrical and wave energy
Processes and products
Coating, forming or etching by sputtering
C204S192150, C204S192170, C204S192250, C204S192260, C204S192290, C427S123000, C427S124000, C427S126100, C427S126300, C427S058000, C427S074000, C427S585000, C427S569000, C427S570000, C427S571000, C427S566000, C427S561000, C362S800000, C372S006000, C438S029000, C438S034000, C438S099000
Reexamination Certificate
active
06228228
ABSTRACT:
The present invention relates to a method for making a light emitting fiber.
The desire for large-size display screens has exceeded the limits of conventional cathode ray tube (CRT) technology in which both the weight and depth of a display tube become excessive when the diagonal of the screen size exceeds about 90 to 100 cm (about 36 to 40 inches). Although rear projection and front projection displays have, at least temporarily, filled a need for larger screen displays in the range of about 90 to 150 cm (about 36 to 60 inches) diagonal, however, such projection displays are also quite deep to accommodate the projection optics, behind the screen in a rear projection display and in the projector in a front projection display, and also have difficulty in achieving and maintaining optical alignment and image registration.
Moreover, as other technologies such as plasma displays and active matrix liquid crystal displays (AMLCD) have been considered for application to large size screen displays that are relatively thin, production yield and cost have become a significant problem. This problem arises from the fact that as the diagonal dimension of the display screen increases, the number of picture elements or pixels in the display increases as the square of the dimension increase, i.e. in relation to the area, and so increases the probability of any display having a defective pixel. Displays with defective pixels are generally not repairable and so must be discarded—any one visible defect can be enough to cause the entire display panel to be scrapped, and the defect can only be found after the expensive panel processing is completed, thereby creating expensive waste. In addition, the capital cost of processing facilities capable of producing such large-area displays is very high, as is the per unit processing cost owing to the need for precision processing, such as lithography, for example. These are major disadvantages of these technologies.
A further disadvantage of the foregoing conventional technologies is that each display device size and configuration must be specifically designed and must be specially tooled for manufacture, both of which require substantial time and resources to accomplish. It would be desirable to avoid such specialized designs.
An advantageous way to avoid these problems is to construct a display of a number of linear light-emitting fibers disposed in a side-by-side array. Thus, each fiber is a separate device whose yield is related to its length, and not the square of the display dimension, and which may be tested individually prior to being assembled into a display. Moreover, it would be advantageous if all the light-emitting elements along the fiber are similar and made by the same process to promote uniformity and high yield.
Accordingly, there is a need for a method for making a light-emitting fiber that avoids the problems of prior art conventional display fabrication methods.
To this end, the method of making a light-emitting fiber comprises providing a length of a fiber, forming a first electrode along the fiber, depositing a light-emitting material along the fiber in electrical contact with the first electrode, and forming a plurality of second electrodes along the fiber in electrical contact with the light-emitting material.
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Chiang William
Roach William Ronald
Singh Bawa
Burke William J.
Diamond Alan
Huq Abhik A.
Sarnoff Corporation
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