Matrix electrode construction

• US 4,326,776 A
• Filed: 05/24/1979
• Issued: 04/27/1982
• Est. Priority Date: 05/24/1978
• Status: Expired due to Term

• Current Assignee: Kabushiki Kaisha Suwa Seikosha
• Original Assignee: Kabushiki Kaisha Suwa Seikosha
• Inventors: Banda, Shunji
• Primary Examiner(s): Bauer, Edward S.
• Application Number:
  US06/042,278
• Time in Patent Office: 1,069 Days
• Field of Search: 350/336, 350/334, 350/333, 340/784
• US Class Current: 349/143
• CPC Class Codes: G02F 1/134336 Matrix
• CPC Class Codes: Y10T 428/249921 Web or sheet containing structurally defined element or component

Abstract

In the construction of an electrode matrix having m·n columns and rows for use, for example, with a liquid crystal display, the number of data electrodes to which independent signals are applied is Nn and the number of scanning electrodes to which independent signals are applied is m/N, N being the interval between elemental cell electrodes connected along the same data electrode. The data electrodes are formed on a baseplate with a layer of insulation covering the data electrodes. Elemental cell electrodes are formed on the insulating layer, and a limited number of openings through the insulating layer allow for an electrical connection between selected cell electrodes and the adjacent data electrode. Scanning electrodes may be formed on the insulating layer and/or on a facing baseplate. Two baseplates are in opposition to form a completed m·n matrix. Data electrodes on opposite plates overlap in the plan view, and a close spacing of individually controlled cell electrodes is achieved.

Claims

1. A matrix display comprising:

a plurality of elemental cell electrodes defining an excitation region in a liquid crystal layer, said cell electrodes being arranged to form a matrix of rows and columns;

a plurality of narrow and elongated data electrodes for connecting together a given number of nonadjacent elemental cell electrodes in each row of cell electrodes;

an insulating layer between said cell electrodes and said data electrodes;

a plurality of openings through said insulating layer, each said opening exclusively associated with one cell electrode and exposing a portion of one data electrode to said one associated cell electrode, a connection being formed between said one data electrode said one associated cell electrode through said opening;

a plurality of scanning electrodes, each said scanning electrode opposing a portion of said elemental cell electrodes and spaced apart therefrom, each scanning electrode being located on the same surface of an insulating layer as approximately half of the cell electrodes and alternating with pairs of cell electrodes, the scanning electrodes forming column excitation electrodes;

a liquid crystal material, said liquid crystal material being positioned between said spaced apart cell electrodes and scanning electrodes, selective application of voltage of suitable level across said opposed scanning electrodes and elemental cell electrodes actuating the excitation region of said liquid crystal therebetween for display.

2. A matrix display as claimed in claim 1, wherein said rows and columns are mutually perpendicular.

3. A matrix display as claimed in claim 2, wherein said data electrodes are substantially parallel to said rows, each cell electrode in said rows being connected to one of said plurality of data electrodes.

4. A matrix display as claimed in claim 3, wherein in a plan view said matrix is arranged in rows and columns of cell electrodes, said data electrodes on said first baseplate overlap said data electrodes on said second baseplate, whereby said columns of cell electrodes may be more closely spaced.

5. An electrode matrix as claimed in claim 3, having transparent baseplates, cell electrodes, and insulating layers.

6. An electrode matrix as claimed in claim 3, wherein said data electrodes are metal.

7. An electrode matrix as claimed in claim 3, wherein said data electrode is transparent.

8. An electrode matrix as claimed in claim 3, wherein said data electrodes are formed on baseplates.

9. An electrode matrix as claimed in claim 3, wherein said openings expose an edge of said cell electrodes.

10. An electrode matrix as claimed in claim 3, wherein said openings expose a central region of said cell electrodes.

11. An electrode matrix as claimed in claim 9 or 10, wherein said cell electrodes are rectangular.

12. An electrode matrix as claimed in claim 3, wherein the number of said rows is at least two, and said longitudinal rows are spaced apart, the spacing between said rows being equal to the width of one of said data electrodes.

13. An electrode matrix as claimed in claim 12, wherein said cell electrodes are rectangular, and said spacing is a distance selected in the range of 1 to 3 mm.

14. An electrode matrix as claimed in claim 3, wherein at least one data electrode extends substantially the length of each said row and is in at least partial registration with said aligned cell electrodes of each said row, said openings in said insulating layer not exposing adjacent cell electrodes in the same row to the same data electrode, a signal on one said data electrode does not drive every cell electrode in a row of cell electrodes.

15. An electrode matrix construction as claimed in claim 3, wherein said matrix comprises an m·

n matrix construction having n said longitudinal rows and m said cell electrodes in each said row, the interval of cell electrodes having a common data electrode being N, and the number of scanning electrodes and the number of data electrodes to which independent signals may be applied are m/N and Nn, respectively, whereby every cell electrode is independently addressable by driving said associated data electrode and said opposed scanning electrode concurrently.