Apparatus for the digital display or recording of data

• US 4,017,157 A
• Filed: 03/26/1975
• Issued: 04/12/1977
• Est. Priority Date: 03/26/1974
• Status: Expired due to Term

• Current Assignee: Maatschappij Van Berkel's Patent NV
• Original Assignee: Maatschappij Van Berkel's Patent NV
• Inventors: van Riet, Aloysius Johannes
• Primary Examiner(s): Bauer, Edward S.
• Application Number:
  US05/562,238
• Time in Patent Office: 748 Days
• Field of Search: 177/2, 177/3, 177/4, 177/5, 177/DIG. 6, 235/58 PS, 235/61 PS, 350/96 BC, 350/160 LC
• US Class Current: 349/2
• CPC Class Codes: B41J 2/447 using arrays of radiation sources B41J2/475 takes precedence
• CPC Class Codes: G01D 13/00 Component parts of indicators for measuring arrangements not specially adapted for a specific variable
• CPC Class Codes: G01G 23/32 Indicating the weight by optical projection means
• CPC Class Codes: G01G 23/37 involving digital counting
• CPC Class Codes: G01G 23/42 electrically operated
• CPC Class Codes: G02F 1/133524 Light-guides, e.g. fibre-optic bundles, louvered or jalousie light-guides
• CPC Class Codes: G02F 2203/64 Normally black display, i.e. the off state being black
• CPC Class Codes: G06K 1/126 by photographic or thermographic registration recording apparatus for measuring instruments G01D15/00
• CPC Class Codes: Y10S 177/06 Photoelectric

Abstract

The apparatus includes a liquid crystal cell having transparent front and back walls with transparent electrodes on their facing sides and a liquid crystal material between the walls. The electrodes are segmented into matrix elements according to the cumulative pattern of all characters desired to be displayed or recorded, and are electrically addressable in response to selection circuitry. The front wall is in the form of a fiber-optic plate comprising a plurality of parallel arranged optical fibers. The apparatus is particularly useful to display or record measurement data, such as from a weighing device.

Claims

1. An apparatus for producing data for display and/or recording purposes, said apparatus comprising:

a liquid crystal cell having a pair of light transparent parallel spaced walls, said cell having an input side on one side of the cell at one of said walls and an output or display side on the opposite side thereof at the other of said walls, light transparent electrodes on the facing sides of the walls profiled to produce alpha-numerical data and/or machine-readable code marks, a source of light producing parallel light rays on the input side of the cell, means for addressing the electrodes in accordance with given information, a liquid crystal material between the walls, and a fiber-optic plate on the output side of the cell having a plurality of parallel arranged optical fibers embedded in a light-absorbing material, wherein the angle of inclination between the light rays produced by said source and the axes of the optical fibes exceeds the limit angle for which total reflection of light rays occurs in the fibers passing undisturbed through the liquid crystal material whereby such light rays do not pass through the fibers.

2. The apparatus defined in claim 1, which further includes a frosted outer surface on the fiber-optic plate for displaying the output of the cell.

3. The apparatus defined in claim 1, which further includes a photosensitive record carrier for receiving the output of the cell.

4. The apparatus defined in claim 1, which includes a plurality of transparent walls between which a plurality of bodies of liquid crystal material is confined.

5. The apparatus defined in claim 1, wherein said optical fibers are perpendicular to said plate and said light rays are inclined relative the plate.

6. The apparatus defined in claim 1, wherein said light rays are perpendicular to the plate and said optical fibers are inclined relative to the plate.

7. The apparatus defined in claim 1, wherein an optical prism is positioned between the light rays and said cell to incline the light rays relative the plate.

8. The apparatus defined in claim 1, wherein said plate forms one wall of the cell.

9. In an apparatus for weighing articles and applying alpha-numerical data and/or machinereadable code marks to the articles, which apparatus includes a liquid crystal cell for producing data and/or marks to be applied to a record carrier applicable to the articles, a weighing device for weighing the articles and feeding a first input to the cell, and a computer receiving the first input of the device and the input of a unit having adjustable and fixed text and feeding a second input to the cell, the improvement in the cell which comprises a pair of spaced transparent walls, said cell having an input side on one side of the cell at one of said walls and an output or display side on the opposite side thereof at the other of said walls, transparent electrodes on the facing sides of said walls, a liquid crystal material between said walls, means for electrically addressing said electrodes in accordance with said inputs, said electrodes profiled to produce said data and/or marks, a source of light producing parallel light rays directed to the input side of the cell, a fiber-optic plate at the output side of the cell having a plurality of parallel arranged optical fibers embedded in a light-absorbing material, and said source and optical fiber axes being such that the angle of inclination therebetween exceeds the limit angle for which total reflection within the fibers occurs of light rays passing undisturbed through the liquid crystal material whereby such light rays do not pass through the fibers.

10. The liquid crystal cell of claim 9, wherein the length of the fibers is at least several times the diameter thereof.

11. The liquid crystal cell of claim 9, wherein the length of each fiber is at least a thousand times the diameter thereof.

12. The liquid crystal cell of claim 9, wherein the angle of inclination is produced by arranging the fibers perpendicular to the plane of the plate and arranging the light rays at an angle relative the plane of the plate.

13. The liquid crystal cell of claim 9, wherein the angle of inclination is produced by arranging the fibers at an incline to the plane of the plate and arranging the light rays perpendicular to the plane of the plate.

14. The liquid crystal cell of claim 9, wherein the fiber-optic plate defines one wall of the cell.

15. The liquid crystal cell of claim 9, wherein the cell is divided by one or more transparent partition walls each of which is provided with transparent electrodes and between each adjacent pair is provided liquid crystal material.

16. In an apparatus for weighing articles and digitally displaying price and weight values, which apparatus includes a liquid crystal cell having a display face for displaying digital price and weight values, a weighing device for weighing the articles and feeding a first input to the cell to display the weight value, a computer receiving the first input of the device and the input of a unit having programmable text which in turn feeds a second input to the cell, the improvement in the cell which comprises a pair of spaced transparent walls, said cell having an input side on one side of the cell at one of said walls and an output or display side on the opposite side thereof at the other of said walls, transparent electrodes on the facing sides of said walls, a liquid crystal material between said walls, means for electrically addressing said electrodes in accordance with said inputs, said electrodes profiled to produce said weight and price values, a source of light producing parallel light rays directed to the input side of the cell, a fiber-optic plate at the output side of the cell having a plurality of parallel arranged optical fibers embedded in a light-absorbing material, and said source and optical fiber axes being such that the angle of inclination therebetween exceeds the limit angle for which total reflection within the fibers occurs of light rays passing undisturbed through the liquid crystal whereby such light rays do not pass through the fibers.

17. The liquid crystal cell defined in claim 16, wherein the display side of the cell is frosted.

18. In a liquid crystal cell having transparent parallel spaced front and back walls, a source of light producing parallel light rays at the back wall, transparent electrodes on the facing sides of said walls, and a liquid crystal material between said walls which when activated cause the scattering of light rays, the improvement in the front wall where an image may be produced being in the form of a fiber-optic plate comprising a plurality of parallel arranged optical fibers at an inclination to the light rays in excess of that which would cause total reflection of the light rays within the fibers, said plate having a plurality of parallel arranged optical fibers embedded in a lightabsorbing material for preventing the transmission of undisturbed light rays and allowing transmission of light rays disturbed by activation of electrodes.