Thin-film structure with dense array of binary control units for presenting images

• US 5,491,347 A
• Filed: 04/28/1994
• Issued: 02/13/1996
• Est. Priority Date: 04/28/1994
• Status: Expired due to Term

• Current Assignee: Thomson Licensing (Vantiva SA)
• Original Assignee: Xerox Corporation (Xerox Holdings Corp.)
• Inventors: Hack, Michael, Stuber, Susan M., Bruce, Richard H., Chuang, Tzu-Chin, Turner, William D., Ho, Jackson H., Silverstein, Louis D., Lewis, Alan G., Martin, Russel A., Fiske, Thomas G., Fulks, Ronald T., Thompson, Malcolm J., Yao, William W., Steemers, Hugo L., Allen, deceased, Robert R.
• Primary Examiner(s): MINTEL, WILLIAM A
• Application Number:
  US08/235,011
• Time in Patent Office: 656 Days
• Field of Search: 257/59, 257/72, 257/88, 257/89, 359/57, 359/58, 359/59, 359/54, 359/55
• US Class Current: 257/59
• CPC Class Codes: G09G 2300/0452 Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components
• CPC Class Codes: G09G 2310/0251 Precharge or discharge of pixel before applying new pixel voltage
• CPC Class Codes: G09G 2320/028 by changing the viewing angle properties, e.g. widening the viewing angle, adapting the viewing angle to the view direction
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence
• CPC Class Codes: G09G 3/3677 suitable for active matrices only
• CPC Class Codes: G09G 3/3688 suitable for active matrices only

Abstract

A thin-film structure on an insulating substrate includes an array of binary control units with an area of at least 90 cm² and a density of at least 60 binary control units per cm. One implementation has an area of approximately 510 cm², a diagonal of approximately 33 cm, and a total of approximately 6.3 million binary control units. Each binary control unit has a lead for receiving a unit drive signal, to which it responds by causing presentation of a segment of images presented by the array. Each binary control unit can present a segment with either a first color having a maximum intensity or a second color having a minimum intensity. Each binary control unit'"'"'s unit drive signal causes the binary control unit to present its first and second colors. The substrate can be glass. Each binary control unit can include an amorphous silicon thin-film transistor (TFT) and a storage capacitor. Each binary control unit can be square. The thin-film structure can be used in an active matrix liquid crystal display (AMLCD), monochrome or, with an appropriate filter, color.

Claims

1. A product comprising:

a substrate that has a surface; and

a thin-film structure formed at the surface of the substrate;

the thin-film structure comprising;

an array of binary control units for causing presentation of images;

each binary control unit having a lead for receiving a unit drive signal;

each binary control unit responding to its unit drive signal by causing presentation of a segment of images presented by the array;

each binary control unit being able to present a segment with either of first and second colors, each binary control unit'"'"'s first color having a maximum intensity the binary control unit can provide, each binary control unit'"'"'s second color having a minimum intensity the binary control unit can provide;

each binary control unit'"'"'s unit drive signal causing the binary control unit to present its first and second colors;

the array extending in first and second directions that are perpendicular;

the binary control units in the array having densities in the first and second directions that are both greater than 60/cm;

the array having an area large enough to present images for direct viewing.

2. The product of claim 1 in which the binary control units have densities in the first and second directions that are both greater than 80/cm.

3. The product of claim 2 in which the binary control units have densities in the first and second directions that are both greater than 100/cm.

4. The product of claim 1 in which the binary control units have the same density in both the first direction and the second direction.

5. The product of claim 4 in which the binary control units have a density in both the first and second directions of approximately 111/cm.

6. The product of claim 1 in which the array has a diagonal dimension of approximately 33 cm and an area of approximately 510 cm².

7. The product of claim 1 in which the array has 3072 binary control units in the first direction and 2048 binary control units in the second direction.

8. The product of claim 1 in which the effective widths of binary control units in the first and second directions are equal.

9. The product of claim 8 in which the effective widths of binary control units in the first and second directions are approximately 90 μ

m.

10. The product of claim 1, further comprising a liquid crystal cell;

the array of binary control units being positioned adjacent the liquid crystal cell with each binary control unit in the array adjacent a part of the liquid crystal cell;

each binary control unit responding to its unit drive signal by controlling a light transmission characteristic of the adjacent part of the liquid crystal cell;

each binary control unit controlling the light transmission characteristic to have a first value when the binary control unit is presenting its first color and to have a second value when the binary control unit is presenting its second color.

11. The product of claim 10 in which the product is a monochrome display;

the binary control units all having the same first color and the same second color.

12. The product of claim 10 in which the product is a color display;

the product further comprising a color filter;

the color filter having a part for each binary control unit so that the first color of each of a first set of the binary control units is a first non-gray color, the first color of each of a second set of the binary control units is a second non-gray color, and the first color of each of a third set of the binary control units is a third non-gray color;

the first, second, and third non-gray colors being different so that the color display can present more than three different non-gray colors.

13. The product of claim 12 in which the color filter includes square groups of four parts, each square group being for first, second, third, and fourth binary control units, the first binary control unit'"'"'s first color being red, the second binary control unit'"'"'s first color being green, the third binary control unit'"'"'s first color being blue, and the fourth binary control unit'"'"'s first color being green;

the second and fourth binary control units being in diagonally opposite corners of a square of binary control units.

14. The product of claim 10 in which the product is an active matrix liquid crystal display.

15. The product of claim 10 in which the light transmission characteristic'"'"'s first value permits maximum light transmission and the light transmission characteristic'"'"'s second value permits minimum light transmission.

16. The product of claim 1 in which each binary control unit'"'"'s unit drive signal can be provided at either of first or second levels;

the binary control unit responding to the first level by presenting its first color and responding to the second level by presenting its second color.

17. The product of claim 1 in which each binary control unit comprises:

a capacitive element having a charging lead;

a thin-film transistor having first and second channel leads and a gate lead;

a charging line connecting the second channel lead of the thin-film transistor to the charging lead of the capacitive element;

a signal line for connecting the first channel lead to receive the binary control unit'"'"'s unit drive signal; and

a gate line for connecting the gate lead to receive a scan signal selecting the binary control unit.

18. The product of claim 17 in which the array further comprises scan lines extending in the first direction and data lines extending in the second direction;

each scan line connecting to the gate lines of a row of the binary control units;

each data line connecting to the signal lines of a column of the binary control units;

each scan line including a scan pad along a first edge of the array;

each data line including a data pad along a second edge of the array;

the product further comprising;

polysilicon thin-film transistor circuitry connected to the scan pads for providing the scan signals on the scan lines; and

polysilicon thin-film transistor circuitry connected to the data pads for providing the unit drive signals on the data lines.

19. The product of claim 18 in which the polysilicon thin-film transistor circuitry comprises pads approximately aligned with the scan pads and the data pads.