PLZT multi-shutter color electrode pattern

• US 4,744,640 A
• Filed: 08/29/1985
• Issued: 05/17/1988
• Est. Priority Date: 08/29/1985
• Status: Expired due to Fees

• Current Assignee: CTS Corporation
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Phillips, James R.
• Primary Examiner(s): Punter, William H.
• Application Number:
  US06/770,560
• Time in Patent Office: 992 Days
• Field of Search: 350/336, 350/356, 350/392, 350/408, 350/339 F, 350/388, 358/59, 358/61, 340/758, 340/778, 346/108
• US Class Current: 359/254
• CPC Class Codes: G02F 1/0551 Constructional details

Abstract

An electro-optic display having either variable-color or selectable-color capability is disclosed, with each having particularly efficient electrode patterns for achieving color control. Each implements a passive display utilizing an electro-optic material such as PLZT having one of these types of electrode patterns and aligned with an appropriate multi-colored filter. By applying D.C. control voltages to these sets of electrodes, which are sufficiently small to form unit cells, variable or selectable color is perceived. The patterns may be arranged in a sequence of any length or width, with the three-shutter pattern featuring no surface-mounted crossovers.

Claims

1. An improved, electronic shutter arrangement having an electrode pattern for controlling a plurality of light paths passing through an electro-optic substrate and forming a plurality of sequentially positioned unit cells, comprising in combination:

electro-optic substrate means responsive to an electric field established between a set of electrodes mounted thereon;

a first set of electrodes having a first active and a first common lead for establishing a first electric field;

a second set of electrodes having a second active and a second common lead for establishing a second electric field, with said second set interleaved with said first set; and

a third set of electrodes having two parts formed by a third active lead interposed in serpentine fashion between said first and second sets of electrodes for establishing a third electric field and interdigitated with said first and second common leads thereof,

said first, second, and third sets of electrodes cooperating to form unit cells in positional sequence and wherein each unit cell provides selectively controlled individual light paths having sets of electrodes positionally related to one another without surface-mounted crossovers.

2. An improved, electronic shutter electrode arrangement according to claim 1, wherein said light paths correspond to three primary colors formed by an aligned, multi-colored filter and wherein said unit cell is sufficiently small so that a blending of any combination of said three primary colors effects the display of any desired, continuously variable, potentially saturated color.

3. An improved, electronic shutter electrode arrangement according to claim 1, wherein said electro-optic substrate means comprises material of lead, lanthanum, zirconium titanate (PLZT).

4. An improved, electronic shutter electrode arrangement according to claim 1, wherein said sets of electrodes comprise transparent electrodes.

5. An improved, electronic shutter electrode arrangement according to claim 4, wherein said transparent electrodes comprise a material such as tin oxide.

6. An improved, electronic shutter electrode arrangement according to claim 1, wherein said sets of electrodes comprise opaque electrodes.

7. An improved, electronic shutter electrode arrangement according to claim 1, wherein said sets of electrodes are formed into a line segment having a predetermined length and width as part of a segmented alphanumeric display.

8. An improved, electronic shutter electrode arrangement according to claim 1, wherein said light paths comprise light eminating trom a source of back light located oppositely from a given viewing surface so as to be transmissive through said electro-optic substrate.

9. An improved, electronic shutter electrode arrangement according to claim 1, wherein said light paths comprise light from an ambient source located on the same side as a given viewing surface and having an appropriately reflective back element so as to effect reflective return of said ambient source light through said electro-optic substrate.

10. An improved, electronic shutter electrode arrangement according to claim 1, wherein said light paths comprise light from an ambient source located on the same side as a given viewing surface in addition to an oppositely located source of back light and having an appropriate partially reflective back element so as to effect transflective passages of light through said electro-optic substrate.

11. An improved, color display apparatus having an electrode pattern for controlling a plurality of triple color light beams formed by an aligned, triple-colored filter and passing through an electro-optic substrate for forming a plurality of sequentially positioned unit cells, comprising in combination:

an electro-optic material such as lead, lanthanum, zirconium titanate (PLZT) responsive to an electric field establishec between a set of electrodes mounted thereon;

a first set of electrodes having a first active and a first common lead for establishing a first electric field;

a second set of electrodes having a second active and a second common lead for establishing a second electric field, said second set interleaved with said first set; and

a third set of electrodes having two parts formed by a third active lead interposed in serpentine fashion between said first and second set of electrodes for establishing a third electric field and interdigitated with said first and second common leads thereof,

said first, second, and third sets of electrodes cooperating to form unit cells in positional sequence wherein each unit cell provides selectively controlled individual light paths having sets of electrodes positionally related to one another without surface-mounted crossovers, and wherein said unit cell is sufficiently small so that a blending of any combination of said three primary colors effects the display of any desired, continuously variable, potentially saturated color.

12. An improved, color display apparatus having an electrode pattern for controlling a plurality of triple color light beams formed by an aligned, triple-colored filter and passing through an electro-optic substrate for forming a plurality of sequentially positioned unit cells, comprising in combination:

an electro-optic material such as lead, lanthanum, zirconium titanate (PLZT) responsive to an electric field established between a set of planar interdigitated electrodes mounted thereon;

a first set of interdigitated electrodes having a first active and a first common lead for establishing a first electric field;

a second set of interdigitated electrodes having a second active and a second common lead for establishing a second electric field, said second set interleaved with said first set; and

a third set of interdigitated electrodes having two parts formed by a third active lead interposed in serpentine fashion between said first and second set of electrodes for establishing a third electric field and interdigitated with said first and second common leads thereof,

said first, second, and third set of interdigitated electrodes cooperating to form unit cells in positional sequence wherein each unit cell provides selectively controlled individual light paths having sets of interdigitated electrodes positionally related to one another without surface-mounted crossovers, and wherein said unit cell is sufficiently small so that a blending of any combination of said three primary colors effects the display of any desired, continously variable, potentially saturated color.