Liquid crystal display with dielectric layer having at least two openings corresponding to each picture element and method of making same

• US 6,259,501 B1
• Filed: 11/24/2000
• Issued: 07/10/2001
• Est. Priority Date: 11/27/1998
• Status: Expired due to Fees

• Current Assignee: Zvi Yaniv
• Original Assignee: Zvi Yaniv
• Inventors: Yaniv, Zvi
• Primary Examiner(s): Sikes, William L.
• Assistant Examiner(s): CHOWDHURY, TARIFUR RASHID
• Application Number:
  US09/721,189
• Time in Patent Office: 228 Days
• Field of Search: 349/86, 349/122, 349/156, 427/510, 427/595-596, 427/289, 427/521, 427/555, 156/99, 156/108, 156/145, 156/310
• US Class Current: 349/122
• CPC Class Codes: G02F 1/133377 Cells with plural compartments or having plurality of liquid crystal microcells partitioned by walls, e.g. one microcell per pixel
• CPC Class Codes: G02F 1/133753 with different alignment orientations or pretilt angles on a same surface, e.g. for grey scale or improved viewing angle
• CPC Class Codes: G02F 1/134363 for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]
• CPC Class Codes: G02F 2203/34 Colour display without the use of colour mosaic filters

Abstract

A liquid crystal display device includes a substrate having one or more electrodes formed onto one major surface thereof. The substrate and electrodes are then coated with a layer of a dielectric material through which is formed a plurality of openings or vias. Into the openings is disposed a layer of a light influencing material, such as a color filter medium, a liquid crystal material, or an alignment material. In the embodiment in which the light influencing material is a liquid crystal material, it is possible to put one or more different liquid crystal materials into each opening. This allows two adjacent openings to project light of a substantially different character, based on the differing material disposed in each opening.

A method for forming a liquid crystal device such as that described above includes the step of providing a liquid crystal display substrate, and forming at least one, and preferably a plurality of electrodes on a surface thereof. Thereafter, a layer of dielectric material is formed onto the surface of the electrodes and substrate. The dielectric material is the treated, as by a laser, to form a plurality of holes or openings therein. Into the openings is disposed the light influencing material.

Claims

1. A liquid crystal display device having a plurality of picture elements, said display comprising:

a first substrate having first and second major surfaces, and having at least one electrode formed on one of said major surfaces;

a layer of a dielectric material disposed atop said first substrate and said at least one electrode, said layer of dielectric material having a plurality of openings formed therein;

at least one layer of a light influencing material disposed in said openings; and

a second substrate disposed atop said layer of dielectric material, and having at least one electrode formed thereon;

wherein at least two of said openings correspond to each said picture element.

2. A liquid crystal display device as in claim 1, wherein said first substrate is fabricated of a substantially transparent material selected from the group of materials consisting of plastics, glasses and combinations thereof.

3. A liquid crystal display device as in claim 1, wherein said first substrate includes a plurality of electrodes formed on said first major surface.

4. A liquid crystal display device as in claim 3, wherein a cross-over of an electrode on said first substrate and an electrode on said second substrate defines a picture element.

5. A liquid crystal display device as in claim 3, wherein at least one opening is formed over each said electrode.

6. A liquid crystal display device as in claim 3, wherein a plurality of openings is formed over each said electrode.

7. A liquid crystal display device as in claim 1, wherein said layer of dielectric material is fabricated of a material selected from the group consisting of organic or inorganic polymers, polyimides, silicon oxides, silicon nitrides and combinations thereof.

8. A liquid crystal display device as in claim 1, wherein said layer of light influencing material further includes a layer of an alignment material.

9. A liquid crystal display device as in claim 8, wherein said layer of alignment material is selected from the group of materials consisting of organic or inorganic alignment materials, polyimides, lecitin, polyvinylalcohol, silicon monoxide, and combinations thereof.

10. A liquid crystal display device as in claim 1, wherein said layer of light influencing material is a layer of material adapted to impart a color to light passing therethrough.

11. A liquid crystal display device as in claim 10, wherein said layer of color imparting material is selected from the group of materials consisting of color inks, polyimide dyes, pigmented polyimides, and combinations thereof.

12. A liquid crystal display device as in claim 1, wherein said layer of light influencing material is a layer of liquid crystal material.

13. A liquid crystal display device as in claim 12, wherein said layer of liquid crystal material is selected from the group of materials consisting of nematic, smectic, cholesteric, chiral nematic, chiral smectic, polymer dispersed liquid crystals, polymer stabilized cholesteric texture, and combinations thereof.

14. A liquid crystal display device as in claim 1, wherein said second substrate is fabricated of a substantially transparent material selected from the group of materials consisting of plastics, glasses and combinations thereof.

15. A liquid crystal display device as in claim 1, wherein a plurality of different materials are used to fill said openings.

16. A liquid crystal display device as in claim 1, wherein said device is a reflective display device.

17. A liquid crystal display device as in claim 1, wherein said display is an active matrix display device.

18. A liquid crystal display device as in claim 1, wherein said second substrate is fabricated of a non-glass material.

19. A method of fabricating a liquid crystal display device having a plurality of picture elements, said method comprising the steps of:

providing a substantially transparent substrate having at least one electrode formed on a surface thereof;

disposing a layer of a dielectric material on said substantially transparent substrate and said at least one electrode;

for each said picture element, forming at least two openings through said layer of dielectric material;

disposing a layer of a light influencing material in each said opening; and

providing a second substrate atop said layer of dielectric material.

20. A method as in claim 19, wherein the step of providing a substantially transparent substrate includes a further step of selecting said substantially transparent substrate from the group of materials consisting of plastics, glasses and combinations thereof.

21. A method as in claim 19, wherein the step of providing an electrode includes a further step of providing a plurality of electrodes formed on a first major surface.

22. A method as in claim 19, wherein the step of providing said layer of dielectric material includes a further step of fabricating said layer of a material selected from the group consisting of organic or inorganic polymers, polyimides, silicon oxides, silicon nitrides and combinations thereof.

23. A method as in claim 19, including a further step of forming at least one opening over each said electrode.

24. A method as in claim 19, including a further step of forming at least a plurality of openings is formed over each said electrode.

25. A method as in claim 19, wherein the step of providing a layer of light influencing material includes a further step of providing a layer of an alignment material with said light influencing material.

26. A method as in claim 19, wherein the step of providing a layer of light influencing material includes a further step of providing a layer of material adapted to impart a color to light passing therethrough.

27. A method as in claim 19, wherein the step of providing a layer of light influencing material comprises a further step of providing said layer as a layer of liquid crystal material.

28. A method as in claim 27, wherein said layer of liquid crystal material is selected from the group of materials consisting of nematic, smectic, cholesteric, chiral nematic, chiral smectic, polymer dispersed liquid crystals, polymer stabilized cholesteric texture, and combinations thereof.

29. A method as in claim 19, including a further step of providing a plurality of different materials to fill said openings.

30. A method as in claim 19, wherein each said electrode defines a picture element.

31. A method as in claim 19, wherein said openings are formed by laser.

32. A method as in claim 19, wherein said openings are formed by a chemical treatment.