Liquid crystal display device having interlaced driving circuits for driving rows and columns one-half cycle out of phase

• US 4,842,371 A
• Filed: 04/14/1988
• Issued: 06/27/1989
• Est. Priority Date: 04/15/1987
• Status: Expired due to Term

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Takafuji, Yutaka, Yasuda, Shuhei
• Primary Examiner(s): Miller, Stanley D.
• Assistant Examiner(s): Gallivan, Richard
• Application Number:
  US07/181,377
• Time in Patent Office: 439 Days
• Field of Search: 350/333, 340/765, 340/784, 340/805
• US Class Current: 345/96
• CPC Class Codes: G09G 3/3607 for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels display of colours in flat matrix panels other than liquid crystal displays G09G3/2003; grey scales specific for television H04N3/127
• CPC Class Codes: G09G 3/3614 Control of polarity reversal in general
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence

Abstract

An active matrix liquid crystal display device operable on an interlaced scanning scheme and having a plurality of liquid crystal cells and switching active elements for driving the liquid crystal cells. The liquid crystal cells and the switching active elements are arranged in a matrix fashion having rows and columns intersecting with each other. The display device comprises a plurality of sets of rows, each set being comprised of neighboring members of the rows of the matrix; a scanning unit for scanning each set with an interlaced scanning signal during any field, odd-numbered source lines each connected with one of the row forming the respective set, even-numbered source lines each connected with the other of the row forming the respective set; and a signal applying unit for applying an odd-numbered field signal to the odd-numbered source line during any field time and for applying an even-numbered field signal to the even-numbered source line during any field time.

Claims

1. An active matrix liquid crystal display device operable on an interlaced scanning scheme and having a plurality of liquid crystal cells and switching active elements for driving the liquid crystal cells, said liquid crystal cells and said switching active elements being arranged in a matrix fashion having rows and columns intersection with each other, the device comprising:

a plurality of sets, each comprised of each neighboring members of the rows of the matrix;

means for scanning each set with an interlaced scanning signal during any fields, odd-numbered source lines each connected with one of said row forming the respective set, even-numbered source lines each connected with the other of said row forming the respective set; and

means for applying an odd-numbered field signal to said odd-numbered field signal to said even-numbered source line during any field time.

2. The device as claimed in claim 1, wherein gates are paired and scanned during the odd- and even-numbered fields.

3. The device as claimed in claim 1, wherein the source line are divided into the odd- and even-numbered ones and driven.

4. The device as claimed in claim 1, further comprising field memories.

5. An active matrix liquid crystal display device including a plurality of rows of video signal lines, a plurality of columns of scanning lines, said rows of the video signal line and the columns of the scanning lines being arranged in a matrix fashion, a picture element electrode disposed at each of intersecting points between the rows and the columns and adapted to receive a video signal through an active element, said device being adapted to be scanned according to an interlaced scanning scheme by a signal supplied through the scanning lines, the device comprising:

a scanning signal supply means for supplying a signal to each of the scanning lines;

a first video signal supply means for supplying a first video signal to odd-numbered columns of the video signal lines;

a second video signal supply means for supplying a second video signal to even-numbered columns of the video signal lines, said second video signal having a phase displacement of a half-cycle period relative to the first video signal;

first and second picture element electrodes to which the first and second video signals are respectively applied;

a first counter electrode confronting each of the first picture element electrodes;

a second counter electrode confronting each of the second picture element electrodes;

a first counter electrode signal supply means for supplying a first counter electrode signal to the first counter electrodes; and

a second counter electrode signal supply means for supplying a second counter electrode signal to the second counter electrodes, said second counter electrode signal having a phase displacement of a half-cycle period relative to the first counter electrode signal.

6. The device as claimed in claim 5, wherein the counter electrodes are divided into odd- and even-numbered source lines.

7. The device as claimed in claim 5, wherein voltages which differ in polarity with each other are applied to odd- and even-numbered source line signals.

8. An active matrix liquid crystal display device which has a first insulating substrate formed with thin film transistors, gate bus electrodes, common line electrodes and picture element electrodes which do not intersect with the gate bus electrodes so as to confront the first insulating substrate and so as to intersect the gate bus electrodes, and a layer of liquid crystal intervening between the first and second insulating substrates, the device comprising:

each of said thin film transistors, which are connected to the same gate bus electrodes, having source and drain electrodes, one of said source and drain electrodes being connected with the picture element electrode and the other of said source and drain electrodes being alternately connected with two common line electrodes confronting with each other with the gate electrode intervening therebetween, said two common line electrodes being applied with voltages different in polarity from each other.

9. The device as claimed in claim 8, wherein each of the voltages applied to the common line electrodes reverses in polarity for each frame.

10. The device as claimed in claim 8, wherein the layer of liquid crystal is twisted nematic, and wherein two polarizing plates sandwiching the liquid crystal layer have respective polarizing directions either parallel or perpendicular to each other.

11. The device as claimed in claim 8, wherein the layer of liquid crystal is nematic liquid crystal added with pigments.

12. The device as claimed in claim 8, wherein gate bus lines and counter electrodes are formed on the same substrate.

13. The device as claimed in claim 8, wherein the data bus electrodes are provided on the opposite substrate.

14. The device as claimed in claim 8, wherein the two counter electrodes are applied with voltages different in polarity from each other.

15. The device as claimed in claim 8, wherein each of the voltages applied to the counter electrodes has its polarity reversed for each frame.

16. The device as claimed in claim 8, wherein the layer of liquid crystal is TN-FE liquid crystal.

17. The device as claimed in claim 8, wherein the layer of liquid crystal is nematic liquid crystal added with pigments.

18. An active matrix liquid crystal display device including a plurality of rows of video signal lines, a plurality of columns of scanning lines, said rows of the video signal line and the columns of the scanning lines being arranged in a matrix fashion, a picture element electrode disposed at each of intersecting points between the rows and the columns and adapted to receive a video signal through an active element, said device being adapted to be scanned according to an interlaced scanning scheme by a signal supplied through the scanning lines, the device comprising:

said video signal lines being comprised of a plurality of pairs of first video signal lines and a plurality of pairs of second video signal lines;

a first video signal supply means for supplying a first video signal to the first video signal lines;

a second video signal supply means for supplying a second video signal to the second video signal lines, said second video signal having a phase displacement of a half-cycle period relative to the first video signal;

a scanning signal supply means for supplying a scanning signal to each of a plurality of sets of odd- and even-numbered scanning lines; and

first and second picture element electrodes to which the first and second video signals are respectively applied, said first and second picture element electrodes being arranged in a displacement of a half-cycle period from each other in a direction of the scanning line.

19. The device as claimed in claim 18, wherein a delta arrangement is employed.

20. The device as claimed in claim 18, wherein odd- and even-numbered gate lines are simultaneously scanned for each field.

21. The device as claimed in claim 18, wherein source lines are driven while divided into odd- and even-numbered source lines.

22. The device as claimed in claim 18, wherein 1 Hz video signal per field is displayed for each of odd- and even-numbered gates.