Display device

• US 8,018,412 B2
• Filed: 03/29/2007
• Issued: 09/13/2011
• Est. Priority Date: 07/21/1999
• Status: Expired due to Fees

• 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:
  US11/729,458
• Publication Number:
  US 20070171164A1
• Time in Patent Office: 1,629 Days
• Field of Search: 345/84, 345 87-100, 345/204, 345/209, 345/210
• 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. A display device comprising:

a source signal line over a first substrate;

a gate signal line over the first substrate;

a transistor over the first substrate;

a plurality of pixel electrodes over the first substrate; and

a driver circuit electrically connected to the source signal line, the driver circuit comprising a circuit for sequentially outputting a signal,

wherein a gate electrode of the transistor is electrically connected to the gate signal line, one of a source region and a drain region of the transistor is electrically connected to the source signal line, and the other of the source region and the drain region of the transistor is electrically connected to one of the plurality of pixel electrodes,

wherein a frame frequency of the display device is 120 Hz or more,

wherein a polarity of a plurality of first signals inputted to the plurality of pixel electrodes in a first frame period is different from a polarity of a plurality of second signals inputted to the plurality of pixel electrodes in a second frame period,

wherein the polarity of the plurality of first signals inputted to the plurality of pixel electrodes is uniform during the first frame period and the polarity of the plurality of second signals inputted to the plurality of pixel electrodes is uniform during the second frame period, and

wherein the first frame period or the second frame period is a period which one image is displayed.

2. A display device according to claim 1, further comprising a color filter over the first substrate.

3. A display device according to claim 1, wherein the display device is incorporated in one selected from the group consisting of a computer, a camera, a goggle type display, a player that uses a recording medium, and a game machine.

4. A display device comprising:

a source signal line over a first substrate;

a gate signal line over the first substrate;

a transistor over the first substrate;

a plurality of pixel electrodes over the first substrate; and

a driver circuit electrically connected to the gate signal line, the driver circuit comprising a circuit for sequentially outputting a signal,

wherein a gate electrode of the transistor is electrically connected to the gate signal line, one of a source region and a drain region of the transistor is electrically connected to the source signal line, and the other of the source region and the drain region of the transistor is electrically connected to one of the plurality of pixel electrodes,

wherein a frame frequency of the display device is 120 Hz or more,

wherein a polarity of a plurality of first signals inputted to the plurality of pixel electrodes in a first frame period is different from a polarity of a plurality of second signals inputted to the plurality of pixel electrodes in a second frame period,

wherein the polarity of the plurality of first signals inputted to the plurality of pixel electrodes is uniform during the first frame period and the polarity of the plurality of second signals inputted to the plurality of pixel electrodes is uniform during the second frame period, and

wherein the first period or the second frame period is a period in which one image is displayed.

5. A display device according to claim 4, further comprising a color filter over the first substrate.

6. A display device according to claim 4, wherein the display device is incorporated in one selected from the group consisting of a computer, a camera, a goggle type display, a player that uses a recording medium, and a game machine.

7. A display device comprising:

a source signal line over a first substrate;

a gate signal line over the first substrate;

a transistor over the first substrate;

a plurality of pixel electrodes over the first substrate;

a first driver circuit electrically connected to the source signal line, the first driver circuit comprising a first circuit for sequentially outputting a signal; and

a second driver circuit electrically connected to the gate signal line, the second driver circuit comprising a second circuit for sequentially outputting a signal,

wherein a gate electrode of the transistor is electrically connected to the gate signal line, one of a source region and a drain region of the transistor is electrically connected to the source signal line, and the other of the source region and the drain region of the transistor is electrically connected to one of the plurality of pixel electrodes,

wherein a frame frequency of the display device is 120 Hz or more,

wherein a polarity of a plurality of first signals inputted to the plurality of pixel electrodes in a first frame period is different from a polarity of a plurality of second signals inputted to the plurality of pixel electrodes in a second frame period,

wherein the polarity of the plurality of first signals inputted to the plurality of pixel electrodes is uniform during the first frame period and the polarity of the plurality of second signals inputted to the plurality of pixel electrodes is uniform during the second frame period, and

wherein the first frame period or the second frame period is a period in which one image is displayed.

8. A display device according to claim 7, further comprising a color filter over the fist substrate.

9. A display device according to claim 7, wherein the display device is incorporated in one selected the group consisting of a computer, a camera, a goggle type display, a player that uses a recording medium, and a game machine.

10. A display device comprising:

a source signal line over a first substrate;

a gate signal line over the first substrate;

a transistor over the first substrate;

a pixel electrode over the first substrate;

a first driver circuit electrically connected to the source signal line, the first driver circuit comprising a first circuit for sequentially outputting a signal, a second circuit for increasing an amplitude of an input signal, a third circuit for sampling a video signal and a D/A converter circuit; and

a second driver circuit electrically connected to the gate signal line, the second driver circuit comprising a fourth circuit for sequentially outputting a signal and a fifth circuit for increasing an amplitude of an input signal,

wherein a gate electrode of the transistor is electrically connected to the gate signal line, one of a source region and a drain region of the transistor is electrically connected to the source signal line, and the other of the source region and the drain region of the transistor is electrically connected to the pixel electrode,

wherein a frame frequency of the display device is 120 Hz or more,

wherein a polarity of a first signal inputted to the pixel electrode in a first frame period is different from a polarity of a second signal inputted to the pixel electrode in a second frame period, and

wherein the first frame period or the second frame period is a period in which one image is displayed.

11. A display device according to claim 10, further comprising a color filter over the first substrate.

12. A display device according to claim 10, wherein the display device is incorporated in one select from the group consisting of a computer, a camera, a goggle type display, a player that uses a recording medium, and a game machine.

13. A display device comprising:

a source signal line over a first substrate;

a gate signal line over the first substrate;

a transistor over the first substrate;

a pixel electrode over the first substrate; and

a driver circuit electrically connected to the source signal line, the driver circuit comprising a clocked inverter circuit,

wherein a gate electrode of the transistor is electrically connected to the gate signal line, one of a source region and a drain region of the transistor is electrically connected to the source signal line, and the other of the source region and the drain region of the transistor is electrically connected to the pixel electrode,

wherein a frame frequency of the display device is 120 Hz or more,

wherein a polarity of a first signal inputted to the pixel electrode in a first frame period is different from a polarity of a second signal inputted to the pixel electrode in a second frame period, and

wherein the first frame period or the second frame period is a period in which one image is displayed.

14. A display device according to claim 13, further comprising a color filter over the first substrate.

15. A display device according to claim 13, wherein the display device is incorporated in one selected from the group consisting of a computer, a camera, a goggle type display, a player that uses a recording medium, and a game machine.

16. A display device comprising:

a source signal line over a first substrate;

a gate signal line over the first substrate;

a transistor over the first substrate;

a pixel electrode over the first substrate; and

a first driver circuit electrically connected to the gate signal line, the first driver circuit comprising a clocked inverter circuit,

wherein a gate electrode of the transistor is electrically connected to the gate signal line, one of a source region and a drain region of the transistor is electrically connected to the source signal line, and the other of the source region and the drain region of the transistor is electrically connected to the pixel electrode,

wherein a frame frequency of the display device is 120 Hz or more,

wherein a polarity of a first signal inputted to the pixel electrode in a first frame period is different from a polarity of a second signal inputted to the pixel electrode in a second frame period, and

wherein the first frame period or the second frame period is a period in which one image is displayed.

17. A display device according to claim 16, further comprising a color filter over the first substrate.

18. A display device according to claim 16, wherein the display device is incorporated in one selected from the group consisting of a computer, a camera, a goggle type display, a player that uses a recording medium, and a game machine.

19. A display device comprising:

a transistor over the first substrate;

a pixel electrode over the first substrate; and

a first driver circuit electrically connected to the transistor, the driver circuit comprising a clocked inverter circuit,

wherein one of a source region and a drain region of the transistor is electrically connected to the pixel electrode,

wherein a frame frequency of the display device is 120 Hz or more,

wherein a polarity of a first signal inputted to the pixel electrode in a first frame period is different from a polarity of a second signal inputted to the pixel electrode in a second frame period, and

wherein the first frame period or the second frame period is a period in which one image is displayed.

20. A display device according to claim 19, further comprising a color filter over the first substrate.

21. A display device according to claim 19, wherein the display device is incorporated in one selected from the group consisting of a computer, a camera, a goggle type display, a player that uses a recording medium, and a game machine.