Display device

• US 8,362,994 B2
• Filed: 08/22/2011
• Issued: 01/29/2013
• 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: Yamazaki, Shunpei, Koyama, Jun, Yamagata, Hirokazu
• Primary Examiner(s): Liang, Regina
• Application Number:
  US13/214,446
• Publication Number:
  US 20110298996A1
• Time in Patent Office: 526 Days
• Field of Search: 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 liquid crystal display device comprising:

a source signal line, a first gate signal line, a second gate signal line, a first pixel electrode, a second pixel electrode, a third pixel electrode and a fourth pixel electrode over a substrate; and

a color filter formed at a side of the substrate,

wherein a first and a second video signals are supplied to the first pixel electrode,

wherein a third and a fourth video signals are supplied to the second pixel electrode,

wherein a fifth and a sixth video signals are supplied to the third pixel electrode,

wherein a seventh and a eights video signals are supplied to the fourth pixel electrode,

wherein the source signal line is interposed between the first pixel electrode and the third pixel electrode, and between the second pixel electrode and the fourth pixel electrode,

wherein the second gate signal line is interposed between the first pixel electrode and the second pixel electrode, and between the third pixel electrode and the fourth pixel electrode,

wherein the first video signal is supplied to the first pixel electrode in a first frame period,

wherein the second video signal having an opposite polarity to the first video signal is supplied to the first pixel electrode in a second frame period subsequent to the first frame period,

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

wherein the fourth video signal having an opposite polarity to the first video signal is supplied to the second pixel electrode in the second frame period,

wherein the fifth video signal having a same polarity as the first video signal is supplied to the third pixel electrode in the first frame period,

wherein the sixth video signal having an opposite polarity to the first video signal is supplied to the third pixel electrode in the second frame period,

wherein the seventh video signal having a same polarity as the first video signal is supplied to the fourth pixel electrode in the first frame period,

wherein the eighth video signal having an opposite polarity to the first video signal is supplied to the fourth pixel electrode in the second frame period,

wherein a frame frequency is 120 Hz or more, and

wherein each of the first frame period and the second frame period is a period in which one image is displayed.

2. The liquid crystal display device according to claim 1, wherein the first gate signal line and the second gate signal line contain aluminum or copper.

3. The liquid crystal display device according to claim 1, wherein the first gate signal line and the second gate signal line contain at least one of titanium, tantalum and tungsten.

4. The liquid crystal display device according to claim 1, wherein the first pixel electrode, the second pixel electrode, the third pixel electrode and the fourth pixel electrode are a stripe arrangement.

5. The liquid crystal display device according to claim 1, wherein the liquid crystal 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.

6. A liquid crystal display device comprising:

a source signal line, a first gate signal line and a second gate signal line over a substrate;

an insulating film over the source signal line, the first gate signal line and the second gate signal line;

a first pixel electrode, a second pixel electrode, a third pixel electrode and a fourth pixel electrode over the insulating film; and

a color filter formed at a side of the substrate,

wherein a first and a second video signals are supplied to the first pixel electrode,

wherein a third and a fourth video signals are supplied to the second pixel electrode,

wherein a fifth and a sixth video signals are supplied to the third pixel electrode,

wherein a seventh and a eights video signals are supplied to the fourth pixel electrode,

wherein the source signal line is interposed between the first pixel electrode and the third pixel electrode, and between the second pixel electrode and the fourth pixel electrode,

wherein the second gate signal line is interposed between the first pixel electrode and the second pixel electrode, and between the third pixel electrode and the fourth pixel electrode,

wherein the first video signal is supplied to the first pixel electrode in a first frame period,

wherein the second video signal having an opposite polarity to the first video signal is supplied to the first pixel electrode in a second frame period subsequent to the first frame period,

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

wherein the fourth video signal having an opposite polarity to the first video signal is supplied to the second pixel electrode in the second frame period,

wherein the fifth video signal having a same polarity as the first video signal is supplied to the third pixel electrode in the first frame period,

wherein the sixth video signal having an opposite polarity to the first video signal is supplied to the third pixel electrode in the second frame period,

wherein the seventh video signal having a same polarity as the first video signal is supplied to the fourth pixel electrode in the first frame period,

wherein the eighth video signal having an opposite polarity to the first video signal is supplied to the fourth pixel electrode in the second frame period,

wherein a frame frequency is 120 Hz or more, and

wherein each of the first frame period and the second frame period is a period in which one image is displayed.

7. The liquid crystal display device according to claim 6, wherein the first gate signal line and the second gate signal line contain aluminum or copper.

8. The liquid crystal display device according to claim 6, wherein the first gate signal line and the second gate signal line contain at least one of titanium, tantalum and tungsten.

9. The liquid crystal display device according to claim 6, wherein the first pixel electrode, the second pixel electrode, the third pixel electrode and the fourth pixel electrode are a stripe arrangement.

10. The liquid crystal display device according to claim 6, wherein the liquid crystal 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.