Liquid crystal display device, active matrix type liquid crystal display device, and method of driving the same

• US 20070115237A1
• Filed: 01/10/2007
• Published: 05/24/2007
• Est. Priority Date: 03/27/1998
• Status: Active Grant

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Hirakata, Yoshiharu
• Granted Patent: US 7,796,108 B2
• Time in Patent Office: Days
• US Class Current: 345/96
• CPC Class Codes: G09G 2310/0213 controlling the sequence of the scanning lines with respect to the patterns to be displayed, e.g. to save power
• CPC Class Codes: G09G 2320/0209 Crosstalk reduction, i.e. to reduce direct or indirect influences of signals directed to a certain pixel of the displayed image on other pixels of said image, inclusive of influences affecting pixels in different frames or fields or sub-images which constitute a same image, e.g. left and right images of a stereoscopic display
• CPC Class Codes: G09G 2320/0247 Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
• CPC Class Codes: G09G 3/3614 Control of polarity reversal in general
• CPC Class Codes: G09G 3/3677 suitable for active matrices only
• CPC Class Codes: G09G 3/3688 suitable for active matrices only

Abstract

A liquid crystal display device with no flicker and with bright excellent display is provided. A polarity pattern of a conventional frame inversion driving is one kind of display. A polarity pattern of a conventional source line inversion driving is two kinds of display, and a disclination pattern is one kind of display. On the contrary, in a circuit structure of the present invention, polarity patterns are made to have not less than four kinds, and disclination patterns are made to have not less than two kinds. By this, bright display in which flicker is not included and poor display due to disclination is improved, can be obtained.

Claims

1. A method of driving a display device comprising:

during a first frame, applying first image signals to a first group of pixels with a positive polarity and a second group of pixels with a negative polarity, wherein the first group of the pixels is adjacent to the second group of the pixels with a first boundary therebetween; and

during a second frame subsequent to the first frame, applying second image signals to a third group of pixels with the positive polarity and a fourth group of pixels with the negative polarity wherein the third group of the pixels is adjacent to the fourth group of the pixels with a second boundary therebetween, the second boundary being in a different position from the first boundary, wherein the third group of the pixels is partly overlapped with the first group of the pixels, and the fourth group of the pixels is partly overlapped with the first group of the pixels.

2. The method of driving a display device according to claim 1, wherein the first group of the pixels, the second group of the pixels, the third group of the pixels, and the fourth group of the pixels are arranged along signal lines, respectively.

3. The method of driving a display device according to claim 1, wherein the display device is included in at least one of electronic equipments selected from the group consisting of a video camera, an electronic still camera, a projector, a head mount display, a car navigation system, a personal computer, and a portable information terminal.

4. A method of driving an active matrix type display device comprising:

during a first frame, applying first image signals to a first group of pixels with a positive polarity and a second group of pixels with a negative polarity, wherein the first group of the pixels is adjacent to the second group of the pixels with a first boundary therebetween; and

during a second frame subsequent to the first frame, applying second image signals to a third group of pixels with the positive polarity and a fourth group of pixels with the negative polarity wherein the third group of the pixels is adjacent to the fourth group of the pixels with a second boundary therebetween, the second boundary being in a different position from the first boundary, wherein the third group of the pixels is partly overlapped with the first group of the pixels, and the fourth group of the pixels is partly overlapped with the first group of the pixels.

5. The method of driving an active matrix type display device according to claim 4, wherein the first group of the pixels, the second group of the pixels, the third group of the pixels, and the fourth group of the pixels are arranged along signal lines, respectively.

6. The method of driving an active matrix type display device according to claim 4, wherein the active matrix type display device is included in at least one of electronic equipments selected from the group consisting of a video camera, an electronic still camera, a projector, a head mount display, a car navigation system, a personal computer, and a portable information terminal.

7. A method of driving a liquid crystal display device comprising:

during a first frame, applying first image signals to a first group of pixels with a positive polarity and a second group of pixels with a negative polarity, wherein the first group of the pixels is adjacent to the second group of the pixels with a first boundary therebetween; and

during a second frame subsequent to the first frame, applying second image signals to a third group of pixels with the positive polarity and a fourth group of pixels with the negative polarity wherein the third group of the pixels is adjacent to the fourth group of the pixels with a second boundary therebetween, the second boundary being in a different position from the first boundary, wherein the third group of the pixels is partly overlapped with the first group of the pixels, and the fourth group of the pixels is partly overlapped with the first group of the pixels.

8. The method of driving a liquid crystal display device according to claim 7, wherein the first group of the pixels, the second group of the pixels, the third group of the pixels, and the fourth group of the pixels are arranged along signal lines, respectively.

9. The method of driving a liquid crystal display device according to claim 7, wherein the liquid crystal display device is included in at least one of electronic equipments selected from the group consisting of a video camera, an electronic still camera, a projector, a head mount display, a car navigation system, a personal computer, and a portable information terminal.

10. The method of driving a liquid crystal display device according to claim 7, wherein the liquid crystal display device comprises an antiferroelectric liquid crystal material.