Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
Patent
1987-11-23
1990-04-10
Miller, Stanley D.
Communications: electrical
Land vehicle alarms or indicators
Internal alarm or indicator responsive to a condition of the...
350330, 350 9615, 340784, G02B 2714, G02F 113
Patent
active
049154869
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a display panel for image presentation (display) and/or recording, comprising a matrix formed of a horizontal and a vertical element set, respectively, adapted to be addressed for selecting points that shall present, alternatively pick up light, one of the element sets acting as shutter means for light.
Displays for image presentation are today incorporated in various products, for example television sets, osiclloscopes, data terminals, medical and other instruments, instrument panels in cars, airplanes and other vehicles, as well as video monitors. As will appear from the following description the invention relates to a display panel which can be used both for presenting and for recording images. This makes possible new practical applications beyond those mentioned above, for example two-way data terminals which can both display a picture and pick up a picture, such as drawings or the like, two-way television and so forth.
Various known techniques have been employed for image presentation, and the most common are based on cathode ray tubes, liquid crystals (LCD), gas plasma techniques, vacuum fluorescent elements and light emitting diodes.
This invention is based upon main components being in the principle previously known per se, i.e. light conductors such as optical fibers and shutter means, for example based on liquid crystals. The prior art which also in part use such components may be considered to be represented by U.S. Pat. No. 3,700,802 and U.S. Pat. No. 3,838,908. The former U.S. patent describes optical fibers from which light can be diverted for acting on light sensitive elements which in turn activate liquid crsytal cells. These then emit light for image forming. Also the latter U.S. patent above is directed to the forming of images by addressing points in a matrix in which there are incorporated light conductors ("wave guides") which include liquid crystals. However, in these cases rather complicated and expensive structures are described, which it is difficult to implement in practice. In part there may also be doubt that the effect aimed at is attainable in practice at all.
The more well-known and traditional forms of image displays otherwise have a number of drawbacks and deficiencies. The cathode ray tube, inter alia, involves a heavy weight, a large space requirement, a high operational voltage and a large power consumption. LCD picture panels are slow in operation, delicate and difficult to read under many circumstances. Gas plasma displays are relatively expensive and need high voltages as well as a limited imaging sharpness. Corresponding drawbacks are also found in vacuum fluorescent elements. Display panels based upon light emitting diodes have not been manufactured to any large scale and probably will not be so because of difficulties of electronic nature and with respect to power.
None of the display panel techniques hitherto known makes it possible by means of one and the same unit both to present pictures and to pick up images on the same display panel.
In view of what is previously known, the novel and specific features in a display panel as stated in the above introduction, according to the invention primarily consists therein that said other element set consists of optical light conductors adapted to receive, alternatively emit light at their ends located outside the matrix itself, and is provided with means positioned at said points for diverting light out of, alternatively into the light conductors transverse to their longitudinal direction, and that this transverse light directly forms the image presented, alternatively directly represents the image recorded, by addressing of both element sets.
The fundamental solution according to the inventionas stated here, involves a number of advantages compared to the various known and proposed systems, inter alia a faster operation, a simpler and more robust design, a good light intensity and above all the ability to both present and record images in combination.
Different embodiments of dislay panels accor
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Miller Stanley D.
Powercraft AS
Thantu Napoleon
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