Display device

• US 7,995,015 B2
• Filed: 02/12/2007
• Issued: 08/09/2011
• Est. Priority Date: 07/21/1999
• Status: Active Grant

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Koyama, Jun, Yamazaki, Shunpei, Yamagata, Hirokazu
• Primary Examiner(s): Liang; Regina
• Application Number:
  US11/705,364
• Publication Number:
  US 20070146265A1
• Time in Patent Office: 1,639 Days
• Field of Search: 345/84, 345 87-100, 345/204, 345/209, 345/210, 348/790, 349 42- 47
• US Class Current: 345/87
• CPC Class Codes: G02F 1/13454 Drivers integrated on the active matrix substrate G02F1/136277 takes precedence
• CPC Class Codes: G02F 1/136222 Colour filters incorporated in the active matrix substrate
• CPC Class Codes: G09G 2300/0408 Integration of the drivers onto the display substrate
• CPC Class Codes: G09G 2310/027 Details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters
• CPC Class Codes: G09G 2310/0289 Details of voltage level shifters arranged for use in a driving circuit
• 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 2320/0219 Reducing feedthrough effects in active matrix panels, i.e. voltage changes on the scan electrode influencing the pixel voltage due to capacitive coupling
• CPC Class Codes: G09G 2320/0233 Improving the luminance or brightness uniformity across the screen
• CPC Class Codes: G09G 2320/0247 Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
• CPC Class Codes: G09G 2340/0435 Change or adaptation of the frame rate of the video stream
• 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
• CPC Class Codes: G09G 3/3666 with the matrix divided into sections
• CPC Class Codes: G09G 3/3677 suitable for active matrices only
• CPC Class Codes: G09G 3/3688 suitable for active matrices only
• CPC Class Codes: H01L 27/1214 comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs
• CPC Class Codes: H01L 27/124 with a particular composition, shape or layout of the wiring layers specially adapted to the circuit arrangement, e.g. scanning lines in LCD pixel circuits wiring structures per se H01L23/52
• CPC Class Codes: H01L 27/127 with a particular formation, treatment or patterning of the active layer specially adapted to the circuit arrangement
• CPC Class Codes: H01L 29/78672 Polycrystalline or microcrystalline silicon transistor

Abstract

Display bright in contrast can be obtained without discrination and flicker in the display device of the direct vision type whose pixel pitches are short to 20 μm or less. A liquid crystal panel is driven through the frame inverse driving method, and the vertical frame frequency is set to 120 Hz or more. Also, each of the pixels is arranged to correspond to one of R, G and B of color filters disposed on a TFT substrate side.

Claims

1. An active matrix display device comprising:

a first source signal line, a second source signal line, a gate signal line, a first transistor, and a second transistor formed over a substrate, wherein the first source signal line and the second source signal line are next to each other, and wherein each gate electrode of the first transistor and the second transistor is electrically connected to the gate signal line;

an insulating film formed over the first transistor and the second transistor; and

a first pixel electrode and a second pixel electrode formed over the insulating film, wherein the first pixel electrode and the second pixel electrode are next to each other, wherein the first pixel electrode is electrically connected to the first source signal line via the first transistor, and wherein the second pixel electrode is electrically connected to the second source signal line via the second transistor,

wherein a first video signal is supplied to the first pixel electrode via the first source signal line during a frame period,

wherein a second video signal having an opposite polarity to the first video signal is supplied to the first pixel electrode via the first source signal line during a next frame period to the frame period,

wherein a third video signal having a same polarity as the first video signal is supplied to the second pixel electrode via the second source signal line during the frame period,

wherein a fourth video signal having an opposite polarity to the third video signal is supplied to the second pixel electrode via the second source signal line during the next frame period to the frame period,

wherein the frame period is a period in which one image is displayed, and

wherein a frame frequency is 120 Hz or more.

2. An active matrix display device according to claim 1, wherein an interval between the first source signal line and the second source signal line is 20 μ

m or less.

3. An active matrix display device according to claim 1, wherein the active matrix display device is incorporated in one selected from the group consisting of a computer, a camera, a game machine, a goggle-type display, and a DVD.

4. An active matrix display device according to claim 1, wherein the second source signal line is interposed between the first pixel electrode and the second pixel electrode.

5. An active matrix display device comprising:

a first source signal line, a second source signal line, a gate signal line, a first transistor, and a second transistor formed over a substrate, wherein the first source signal line and the second source signal line are next to each other, and wherein each gate electrode of the first transistor and the second transistor is electrically connected to the gate signal line;

a resin film formed over the first transistor and the second transistor; and

a first pixel electrode and a second pixel electrode formed over the resin film, wherein the first pixel electrode and the second pixel electrode are next to each other, wherein the first pixel electrode is electrically connected to the first source signal line via the first transistor, and wherein the second pixel electrode is electrically connected to the second source signal line via the second transistor,

wherein a first video signal is supplied to the first pixel electrode via the first source signal line during a frame period,

wherein a second video signal having an opposite polarity to the first video signal is supplied to the first pixel electrode via the first source signal line during a next frame period to the frame period,

wherein a third video signal having a same polarity as the first video signal is supplied to the second pixel electrode via the second source signal line during the frame period,

wherein a fourth video signal having an opposite polarity to the third video signal is supplied to the second pixel electrode via the second source signal line during the next frame period to the frame period,

wherein the frame period is a period in which one image is displayed, and

wherein a frame frequency is 120 Hz or more.

6. An active matrix display device according to claim 5, wherein an interval between the first source signal line and the second source signal line is 20 μ

m or less.

7. An active matrix display device according to claim 5, wherein the active matrix display device is incorporated in one selected from the group consisting of a computer, a camera, a game machine, a goggle-type display, and a DVD.

8. An active matrix display device according to claim 5, wherein the second source signal line is interposed between the first pixel electrode and the second pixel electrode.

9. An active matrix display device comprising:

a first source signal line, a second source signal line, a gate signal line, a first transistor, and a second transistor formed over a substrate, wherein the first source signal line and the second source signal line are next to each other, and wherein each gate electrode of the first transistor and the second transistor is electrically connected to the gate signal line;

an insulating film formed over the first transistor and the second transistor; and

a first pixel electrode and a second pixel electrode formed over the insulating film, wherein the first pixel electrode and the second pixel electrode are next to each other, wherein the first pixel electrode is electrically connected to the first source signal line via the first transistor, and wherein the second pixel electrode is electrically connected to the second source signal line via the second transistor; and

a color filter formed at a substrate side where the first and the second transistors are formed,

wherein a first video signal is supplied to the first pixel electrode via the first source signal line during a frame period,

wherein a second video signal having an opposite polarity to the first video signal is supplied to the first pixel electrode via the first source signal line during a next frame period to the frame period,

wherein a third video signal having a same polarity as the first video signal is supplied to the second pixel electrode via the second source signal line during the frame period,

wherein a fourth video signal having an opposite polarity to the third video signal is supplied to the second pixel electrode via the second source signal line during the next frame period to the frame period,

wherein the frame period is a period in which one image is displayed, and

wherein a frame frequency is 120 Hz or more.

10. An active matrix display device according to claim 9, wherein an interval between the first source signal line and the second source signal line is 20 μ

m or less.

11. An active matrix display device according to claim 9, wherein the active matrix display device is incorporated in one selected from the group consisting of a computer, a camera, a game machine, a goggle-type display, and a DVD.

12. An active matrix display device according to claim 9, wherein the second source signal line is interposed between the first pixel electrode and the second pixel electrode.

13. An active matrix display device comprising:

a first source signal line, a second source signal line, a gate signal line, a first transistor, and a second transistor formed over a substrate, wherein the first source signal line and the second source signal line are next to each other, and wherein each gate electrode of the first transistor and the second transistor is electrically connected to the gate signal line;

a resin film formed over the first transistor and the second transistor; and

a first pixel electrode and a second pixel electrode formed over the resin film, wherein the first pixel electrode and the second pixel electrode are next to each other, wherein the first pixel electrode is electrically connected to the first source signal line via the first transistor, and wherein the second pixel electrode is electrically connected to the second source signal line via the second transistor; and

a color filter formed at a substrate side where the first and the second transistors are formed,

wherein a first video signal is supplied to the first pixel electrode via the first source signal line during a frame period,

wherein a second video signal having an opposite polarity to the first video signal is supplied to the first pixel electrode via the first source signal line during a next frame period to the frame period,

wherein a third video signal having a same polarity as the first video signal is supplied to the second pixel electrode via the second source signal line during the frame period,

wherein a fourth video signal having an opposite polarity to the third video signal is supplied to the second pixel electrode via the second source signal line during the next frame period to the frame period,

wherein the frame period is a period in which one image is displayed, and

wherein a frame frequency is 120 Hz or more.

14. An active matrix display device according to claim 13, wherein an interval between the first source signal line and the second source signal line is 20 μ

m or less.

15. An active matrix display device according to claim 13, wherein the active matrix display device is incorporated in one selected from the group consisting of a computer, a camera, a game machine, a goggle-type display, and a DVD.

16. An active matrix display device according to claim 13, wherein the second source signal line is interposed between the first pixel electrode and the second pixel electrode.

17. An active matrix display device comprising:

a first source signal line, a second source signal line, a gate signal line, a first transistor, and a second transistor formed over a substrate, wherein each gate electrode of the first transistor and the second transistor is electrically connected to the gate signal line;

an insulating film formed over the first transistor and the second transistor; and

a first pixel electrode and a second pixel electrode formed over the insulating film, wherein the first pixel electrode is electrically connected to the first source signal line via the first transistor, and wherein the second pixel electrode is electrically connected to the second source signal line via the second transistor,

wherein a first video signal is supplied to the first pixel electrode via the first source signal line during a frame period,

wherein a second video signal having an opposite polarity to the first video signal is supplied to the first pixel electrode via the first source signal line during a next frame period to the frame period,

wherein a third video signal having a same polarity as the first video signal is supplied to the second pixel electrode via the second source signal line during the frame period,

wherein a fourth video signal having an opposite polarity to the third video signal is supplied to the second pixel electrode via the second source signal line during the next frame period to the frame period,

wherein the frame period is a period in which one image is displayed, and

wherein a frame frequency is 120 Hz or more.

18. An active matrix display device according to claim 17, wherein an interval between the first source signal line and the second source signal line is 20 μ

m or less.

19. An active matrix display device according to claim 17, wherein the active matrix display device is incorporated in one selected from the group consisting of a computer, a camera, a game machine, a goggle-type display, and a DVD.

20. An active matrix display device according to claim 17, wherein the second source signal line is interposed between the first pixel electrode and the second pixel electrode.

21. An active matrix display device comprising:

a first source signal line, a second source signal line, a gate signal line, a first transistor, and a second transistor formed over a substrate, wherein each gate electrode of the first transistor and the second transistor is electrically connected to the gate signal line;

an insulating film formed over the first transistor and the second transistor; and

a first pixel electrode and a second pixel electrode formed over the insulating film, wherein the first pixel electrode and the second pixel electrode are next to each other, wherein the first pixel electrode is electrically connected to the first source signal line via the first transistor, and wherein the second pixel electrode is electrically connected to the second source signal line via the second transistor,

wherein a first video signal is supplied to the first pixel electrode via the first source signal line during a frame period,

wherein a second video signal having an opposite polarity to the first video signal is supplied to the first pixel electrode via the first source signal line during a next frame period to the frame period,

wherein a third video signal having a same polarity as the first video signal is supplied to the second pixel electrode via the second source signal line during the frame period,

wherein a fourth video signal having an opposite polarity to the third video signal is supplied to the second pixel electrode via the second source signal line during the next frame period to the frame period,

wherein the frame period is a period in which one image is displayed, and

wherein a frame frequency is 120 Hz or more.

22. An active matrix display device according to claim 21, wherein an interval between the first source signal line and the second source signal line is 20 μ

m or less.

23. An active matrix display device according to claim 21, wherein the active matrix display device is incorporated in one selected from the group consisting of a computer, a camera, a game machine, a goggle-type display, and a DVD.

24. An active matrix display device according to claim 21, wherein the second source signal line is interposed between the first pixel electrode and the second pixel electrode.