Thin-film transistor liquid crystal display devices having cross-coupled storage capacitors

• US 5,808,706 A
• Filed: 03/19/1997
• Issued: 09/15/1998
• Est. Priority Date: 03/19/1997
• Status: Expired due to Term

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Bae, Byung-Seong
• Primary Examiner(s): Sikes, William L.
• Assistant Examiner(s): NGUYEN, TIEP HUU
• Application Number:
  US08/821,062
• Time in Patent Office: 545 Days
• Field of Search: 349/38, 349/54, 349/39
• US Class Current: 349/38
• CPC Class Codes: G02F 1/136213 Storage capacitors associated with the pixel electrode

Abstract

Liquid crystal display devices include a matrix of thin-film transistor (TFT) display cells and storage capacitors to capacitively cross-couple pixel electrodes of adjacent display cells together in an efficient manner to improve display resolution. A preferred display device includes a plurality of liquid crystal display cells and spaced storage capacitors which are directly cross-coupled between pixel electrodes of display cells in adjacent rows and/or columns of cells. Here, the spaced storage capacitors each have a first electrode electrically connected to a pixel electrode in one display cell and a second electrode spaced opposite the first electrode and electrically connected to a pixel electrode in another adjacent display cell in the same column or row of display cells. Preferably, the first electrodes of the storage capacitors are contiguous with the pixel electrodes of a respective display cell and the second electrodes of the storage capacitors are electrically connected at ends thereof to respective pixel electrodes by a conductive via. By directly cross-coupling pixel electrodes of closely adjacent display cells together, improved display resolution can be achieved. For example, in the event a pixel electrode of a display cell cannot be properly loaded, the data (e.g., charge) from closely adjacent cells can be shared efficiently by direct cross-coupling to improve overall display resolution, particularly when the data to be loaded into the adjacent display cells is the same.

Claims

1. A thin-film transistor liquid crystal display device, comprising:

a plurality of liquid crystal display cells having pixel electrodes therein; and

a plurality of storage capacitors, each of said plurality of storage capacitors having a first electrode electrically connected to a pixel electrode in one display cell and a second electrode spaced opposite the first electrode and electrically connected to a pixel electrode in another display cell.

2. The display device of claim 1, wherein said plurality of liquid crystal display cells are electrically coupled to a common data line.

3. The display device of claim 1, wherein said plurality of liquid crystal display cells are electrically coupled to a common gate line.

4. The display device of claim 1, wherein the second electrodes of said plurality of storage capacitors are spaced from each other and arranged end-to-end as a string of spaced electrodes.

5. The display device of claim 1, wherein said plurality of liquid crystal display cells are arranged as a matrix of display cells having rows and columns of display cells therein;

and wherein the second electrodes of said plurality of storage capacitors are electrically connected to pixel electrodes of display cells in a first row thereof.

6. The display device of claim 5, wherein each of the pixel electrodes of display cells in the first row thereof is electrically connected to a respective third electrode;

and wherein each of the third electrodes is capacitively coupled to a pixel electrode of a respective display cell in a second row thereof.

7. The display device of claim 1, wherein said plurality of liquid crystal display cells are arranged as a matrix of display cells having rows and columns of display cells therein;

and wherein the second electrodes of said plurality of storage capacitors are electrically connected to pixel electrodes of display cells in a first column thereof.

16. The display device of claim 1, wherein each of the first electrodes of said plurality of storage capacitors is contiguous with a respective pixel electrode in said plurality of liquid crystal display cells.

8. A thin-film transistor liquid crystal display device, comprising:

a plurality of liquid crystal display cells having pixel electrodes therein; and

a first plurality of spaced storage capacitor electrodes, each of said first plurality of spaced storage capacitor electrodes capacitively coupled to a respective pixel electrode in one display cell and electrically connected to a respective pixel electrode in another display cell.

9. The display device of claim 8, wherein said plurality of liquid crystal display cells are arranged as a matrix of display cells having rows and columns of display cells therein;

and wherein said first plurality of storage capacitor electrodes are electrically connected to pixel electrodes of display cells in a first row thereof.

10. The display device of claim 8, wherein said plurality of liquid crystal display cells are arranged as a matrix of display cells having rows and columns of display cells therein;

and wherein said first plurality of storage capacitor electrodes are electrically connected to pixel electrodes of display cells in a first column thereof.

11. The display device of claim 9, further comprising a second plurality of spaced storage capacitor electrodes, each of said second plurality of spaced storage capacitor electrodes electrically connected to a respective pixel electrode of a display cell in the first row of display cells and capacitively coupled to a respective pixel electrode of a display cell in a second row of display cells.

12. The display device of claim 9, further comprising a plurality of data lines which are each spaced between display cells in adjacent columns thereof;

wherein each of the columns of display cells is operatively coupled to a respective data line; and

wherein said first plurality of storage capacitor electrodes overlap or underlie respective data lines.

13. The display device of claim 12, wherein said first plurality of storage capacitor electrodes are arranged end-to-end as a string of electrodes.

14. The display device of claim 10, further comprising a plurality of gate lines which are each spaced between display cells in adjacent rows thereof;

wherein each of the rows of display cells is operatively coupled to a respective gate line; and

wherein said first plurality of storage capacitor electrodes overlap or underlie respective gate lines.

15. The display device of claim 8, wherein each of said first plurality of spaced storage capacitor electrodes is separated from the respective pixel electrode in one display cell by an electrically insulating region and electrically connected through a via in the electrically insulating region to the respective pixel electrode in another display cell.

17. A liquid crystal display device, comprising:

a control line;

a first plurality of liquid crystal display cells operatively connected to said control line as a first row or first column of display cells;

a second plurality of liquid crystal display cells extending adjacent said control line; and

a plurality of storage capacitor electrodes, each of said plurality of storage capacitor electrodes electrically connected to a pixel electrode of a respective display cell in said first plurality thereof and capacitively coupled to a pixel electrode of a respective display cell in said second plurality thereof.

18. The display device of claim 17, wherein said plurality of storage capacitor electrodes overlap or underlie said control line;

and wherein said control line comprises a data line or gate line.