Elliptical LCD bar graph with path outline-defining segments

• US 4,815,824 A
• Filed: 02/23/1988
• Issued: 03/28/1989
• Est. Priority Date: 02/23/1988
• Status: Expired due to Fees

• Current Assignee: WPI Instruments, Inc.
• Original Assignee: Kenneth R. Sharples
• Inventors: Sharples, Kenneth R.
• Primary Examiner(s): Miller, Stanley D.
• Assistant Examiner(s): Gallivan, Richard
• Application Number:
  US07/159,169
• Time in Patent Office: 399 Days
• Field of Search: 350/332, 350/336, 340/753, 340/765, 340/784
• US Class Current: 349/110
• CPC Class Codes: G01R 13/403 using passive display devices, e.g. liquid crystal display or Kerr effect display devices
• CPC Class Codes: G02F 1/134309 characterised by their geometrical arrangement

Abstract

A liquid crystal analog display device that displays along a predetermined path defined by a path outline. It includes a backplane defining the path outline; a plurality of display segments disposed along the path; a display segment backplane; a plurality of outline segments associated with the display segments for further defining the path outline; means for applying an electric potential to the display and outline segments; means for applying an electric potential to the path outline backplane so that there is an a.c. field across the path outline segment and the path outline backplane sufficient to maintain the path outline image; and means for selectively applying an electric field across the display segments and the display segment backplane for establishing an analog image display. There is also disclosed means for applying an electric potential to the backplane defining picket outlines so that there is an a.c. field across the picket outline backplane and the associated display segment sufficient to maintain the picket outline image.

Claims

1. A liquid crystal analog display device that displays along a predetermined path defined by a path outline, comprising:

a backplane defining the path outline;

a plurality of display segments disposed along the path;

a display segment backplane;

a plurality of outline segments associated with the display segments for further defining the path outline;

means for applying an electric potential to the display and outline segments;

means for applying an electric potential to the path outline backplane so that there is an a.c. field across the path outline segments and the path outline backplane sufficient to maintain the path outline image; and

means for selectively applying an electric field across said display segments and said display segment backplane for establishing an analog image display.

2. The device of claim 1 in which said path outline is elliptical.

3. The device of claim 1 in which said outline segments are disposed in close proximity to produce the illusion of a continuous outline.

4. The device of claim 3 in which said path outline includes two boundaries one on each side of the path.

5. The device of claim 1 further including a digital display accompanying the analog display.

6. The device of claim 1 in which said segments are energized by leads extending outside of the path and further including means for blocking electro-optic effects caused by the leads.

7. The liquid crystal display device of claim 6 in which means for blocking includes opaque material.

8. A liquid crystal analog display device that displays an analog image display along a predetermined path that includes a number of major pickets representing a delineation of a higher order scale value, comprising:

a backplane defining the picket outlines;

a plurality of display segments disposed along the path;

a display segment backplane;

means for applying an electric potential to said display segments;

means for applying an electric potential to said backplane defining the picket outlines so that there is an a.c. field across the picket outline backplane and an associated display segment sufficient to maintain the picket outline image; and

means for selectively applying an electric field across said display segments and said display segment backplane for establishing the analog image display.

9. The device of claim 8 in which the associated display segment overlies the picket outline backplane and a portion of an adjacent, spaced, display segment backplane for establishing an electric potential across that associated display segment and display segment backplane for creating the image of a segment at the picket when the analog display reaches the value of that picket.

10. The device of claim 9 in which the display segment overlies equal widths on each of the display segment backplane and picket outline backplane.

11. The device of claim 10 in which the space between the backplanes is equal in width to that of the overlay of the display segment and the backplanes.

12. The device of claim 8 in which said path is elliptical.

13. A liquid crystal analog display device that displays along a predetermined path defined by a path outline and including a number of major pickets, comprising:

a backplane defining the path outline and picket outline;

a plurality of display segments disposed along the path;

a display segment backplane;

a plurality of outline segments associated with the display segments for further defining the path outline;

means for applying an electric potential to the display and outline segments;

means for applying an electric potential to the path outline and picket outline backplane so that there is an a.c. field across the path outline and display segments and the path outline backplane sufficient to maintain the path outline and major picket images;

means for selectively applying an electric field across said display segments and said display segment backplane for establishing an analog image display.