Active matrix electro-optic display device with close-packed arrangement of diamond-like shaped

• US 5,146,356 A
• Filed: 02/04/1991
• Issued: 09/08/1992
• Est. Priority Date: 02/04/1991
• Status: Expired due to Fees

• Current Assignee: North American Philips Corp. (Koninklijke Philips N.V.)
• Original Assignee: North American Philips Corp. (Koninklijke Philips N.V.)
• Inventors: Carlson, Allan I.
• Primary Examiner(s): Miller, Stanley D.
• Assistant Examiner(s): TRICE, RONALD
• Application Number:
  US07/650,147
• Time in Patent Office: 582 Days
• Field of Search: 350/333, 350/334, 350/332, 350/336, 359/87, 359/68, 359/59, 359/61
• US Class Current: 349/38
• CPC Class Codes: G02F 1/1362 Active matrix addressed cells G02F1/134336, G02F1/134363 take precedence

Abstract

An active matrix liquid crystal display device has diamond-shaped pixels arrayed in a close-packed arrangement, and interconnected by row and column electrodes which zigzag between the pixels, each column electrode extending between and being common to two columns of pixels and their associated thin film switches, and the column electrode-switch connections alternating sequentially between pixel columns.

Claims

1. An active matrix electro-optic display device comprising an electro-optic material sandwiched between opposing walls, at least one of which is transparent, on one of the walls:

an array of pixel electrodes;

a switch associated with each pixel electrode, and an array of row and column electrodes interconnecting the pixel electrodes via the switches, the pixel electrodes being diamond-like shaped and arrayed in a close-packed arrangement;

characterized in that;

each column electrode extends between and is common to two columns of pixels and their associated switches; and

the column electrode-switch connections alternate sequentially between pixel columns.

2. The device of claim 1 in which the row electrodes comprise legs extending between adjacent sides of the pixel electrodes and in close proximity near the corners of the pixel electrodes, thereby following a zig-zag pattern between the rows of pixel electrodes.

3. The device of claim 2 in which the column electrodes follow a zig-zag pattern between the columns of pixel electrodes.

4. The device of claim 3 in which the row and column electrodes cross over along adjacent sides of the pixel electrodes.

5. The device of claim 4 in which cross-over occurs substantially at the mid-points of the adjacent sides.

6. The device of claim 1 in which the switches comprise thin film transistors having source, drain and channel regions, and source, drain and gate electrodes.

7. The device of claim 2 in which the source electrode of each switch is connected to a column electrode, the gate electrode is a portion of a row electrode, and the drain electrode is connected to a pixel electrode.

8. The device of claim 6 in which the source, drain and channel regions of the thin film transistor switch comprise polycrystalline silicon.

9. The device of claim 8 in which each switch also comprises a second gate electrode extending from the row electrode.

10. The device of claim 9 in which the second gate electrode extends from one leg of the row electrode near and in a direction parallel to the gate electrode portion of an adjoining leg of the row electrode.

11. The device of claim 8 in which at least a portion of the row electrode adjacent to the top sides of a pixel comprise one electrode of a storage capacitor for the pixel.

12. The device of claim 1 in which the adjacent sides of the pixels are at approximately right angles to one another.

13. The device of claim 1 in which the electro-optic material is a liquid crystal material.