Display panel having conductive contact media

• US 4,600,273 A
• Filed: 04/19/1983
• Issued: 07/15/1986
• Est. Priority Date: 04/20/1982
• Status: Expired due to Term

• Current Assignee: Seiko Epson Kabushiki Kaisha
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: Ohno, Yoshihiro
• Primary Examiner(s): Corbin, John K.
• Assistant Examiner(s): Gallivan, Richard F.
• Application Number:
  US06/486,608
• Time in Patent Office: 1,183 Days
• Field of Search: 350/336, 350/344, 350/343
• US Class Current: 349/155
• CPC Class Codes: G02F 1/1339 Gaskets; Spacers; Sealing of cells
• CPC Class Codes: G02F 1/13392 spacers dispersed on the cell substrate, e.g. spherical particles, microfibres
• CPC Class Codes: G02F 1/1345 Conductors connecting electrodes to cell terminals

Abstract

A liquid crystal display panel comprising opposed substrates, electrodes on the inside opposed surfaces of said substrates and arranged opposite to each other to sandwich a display layer, a contact media for electrically connecting an electrode on one substrate with an electrode on the other substrate and disposed between said electrodes of said substrates, and a binder between said substrates and fixably engaging said contact media with said electrodes, the diameter of said contact media selected to be substantially the same as the thickness of a liquid crystal cell layer. The contact media comprises a non-conductive core electroless plated with a conducting metal.

Claims

1. A liquid crystal display panel comprising opposed substrates, electrodes on the inside opposed surfaces of said substrates and arranged opposite to each other to define a liquid crystal display layer including a contact portion with a contact media admixed with a binder disposed between the substrates for maintaining the substrates spaced apart and electrically connecting an electrode on one substrate with an electrode on the other substrate, the dimension of said contact media selected to be substantially the same as the thickness of a liquid crystal cell layer, said contact media containing a non-conductive core particle coated with a first conductive layer formed by electroless plating of the core particle and a second conductive layer comprising a precious metal formed on the first conductive layer.

2. A display panel, as described in claim 1, wherein the non-conductive core is selected from the group consisting of glass fibers, glass beads, and plastic balls.

3. A display panel, as described in claim 1, wherein the non-conductive core is coated by electroless plating of at least one metal selected from the group consisting of gold, silver, tin, copper and nickel.

4. The display panel of claim 3, wherein the second conductive layer is gold.

5. A display panel, as described in claim 1, wherein the non-conductive core is spherical.

6. A display panel, as described in claim 5, wherein the non-conductive particle comprises a plastic ball.

7. A display panel as described in claim 1, wherein the non-conductive core is cylindrical.

8. A display panel, as described in claim 7, wherein the non-conductive core comprises glass fibers having an average diameter of between about 3 and 12 μ

m and an average length of about 20 to 100 μ

m.

9. A display panel, as described in claim 1, wherein the contact media and binder comprise from about 0.1 to about 50 weight percent contact media to about 99.9 to about 50 weight percent binder.

10. A display panel, as described in claim 1, wherein the contact portion includes at least about 5 coated particles engaged by the binder.

11. A display panel, as described in claim 1, wherein the liquid crystal cell layer is between about 3 and 12 thick.

12. A display panel, as described in claim 1, wherein the cell thickness is substantially the same as the diameter of the engaged contact media to enable the upper and lower electrodes to be secured in fixed parallel opposition by the contact media.

13. A display panel as described in claim 1, wherein the binder includes a plurality of particles of a conductive metal in a paste.

14. The display panel of claim 1, having two electroless plated conductive layers on the non-conductive core particle.

15. The display panel of claim 14, wherein a first layer of electroless-plated nickel is on the non-conductive core and a second layer of electroless plated gold is disposed on the nickel layer.