Data display device

• US 3,938,140 A
• Filed: 05/06/1974
• Issued: 02/10/1976
• Est. Priority Date: 05/09/1973
• Status: Expired due to Term

• Current Assignee: Thomson-CSF (Thales SA)
• Original Assignee: Thomson-CSF (Thales SA)
• Inventors: Hareng, Michel, Leiba, Eugene, Garcia, Jean
• Primary Examiner(s): Trafton, David L.
• Application Number:
  US05/467,562
• Time in Patent Office: 645 Days
• Field of Search: 340/336, 340/378 R, 313/510, 313/513, 313/520, 350/160 LC
• US Class Current: 345/50
• CPC Class Codes: G02F 1/134327 Segmented, e.g. alpha numeric display
• CPC Class Codes: G09F 9/302 characterised by the form or geometrical disposition of the individual elements

Abstract

The invention relates to data display devices having a segmented structure. It provides a display device whose adjacent coplanar segments are divided up into complementary areas respectively connected to excitation units controlled simultaneously in such manner as to produce, in the absence of break down, a homogeneous display of the segments. The invention applies to display by elementary sources of light or by liquid crystals and other materials having electro-optical properties.

Claims

1. A data display device comprising at least one segment whose shape has a descriptive value, said shape undergoing a perceptible change in appearance under the action of a control signal applied to means for exciting said segment, wherein each said segment comprises a same number of complementary areas;

said excitation means being divided up into as many excitation units as there are areas in each said segment;

said units being electrically connected to said areas by separate connections and being controlled simultaneously by said control signal.

2. A display device as claimed in claim 1, comprising an assembly of coplaner adjacent segments which afford, by combination, separate configurations appearing in succession under the control of groups of control signals applied simultaneously to said excitation units.

3. A display device as claimed in claim 1, wherein each segment is embodied by a plurality of elementary sources of light which are respectively assigned to each one of said complementary areas.

4. A display device as claimed in claim 1, wherein each segment is constituted by a stack of a group of transparent elementary electrodes, a layer of material whose optical properties are modified under the action of an electrical field and at least one counter-electrode facing said group of electrodes;

said elementary electrodes respectively defining said complementary areas.

5. A display device as claimed in claim 4, wherein said material is a liquid crystal.

6. A display device as claimed in claim 1, wherein the separations between said complementary areas have the shape of continuous lines intersecting the perimeter of said segment.

7. A display device as claimed in claim 1, wherein at least one of the areas of said segment has the form of an ambiguity-indicating graphical sign resulting from the incomplete excitation of said segment.

8. A display device as claimed in claim 1, wherein said segment comprises two complementary areas.

9. A display device as claimed in claim 7, wherein the form of said segment has a descriptive value peculiar to said segment and distinct from that of said graphical sign.