Liquid crystal display device, active matrix type liquid crystal display device, and method of driving the same
First Claim
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1. A method of driving an active matrix type liquid crystal display device comprising a video control circuit and a selecting circuit, comprising:
- producing first image signals with a first polarity and a second polarity opposite to said first polarity by the video control circuit;
during a first frame, applying the first image signals to a first group of pixels with the first polarity and a second group of pixels with the second polarity, wherein said first group of the pixels is adjacent to said second group of the pixels with a first boundary therebetween; and
producing second image signals with the first polarity and the second polarity by said video control circuit;
during a second frame subsequent to said first frame, applying the second image signals to a third group of pixels with the first polarity and a fourth group of pixels with the second polarity wherein said third group of the pixels is adjacent to said fourth group of the pixels with a second boundary therebetween, said second boundary being in a different position from said first boundary,wherein said third group of pixels is partly overlapped with the first group of pixels, and said fourth group of the pixels is partly overlapped with the first group of the pixels, andselection of the first and second polarities is performed by said selecting circuit.
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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.
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Citations
36 Claims
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1. A method of driving an active matrix type liquid crystal display device comprising a video control circuit and a selecting circuit, comprising:
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producing first image signals with a first polarity and a second polarity opposite to said first polarity by the video control circuit; during a first frame, applying the first image signals to a first group of pixels with the first polarity and a second group of pixels with the second polarity, wherein said first group of the pixels is adjacent to said second group of the pixels with a first boundary therebetween; and producing second image signals with the first polarity and the second polarity by said video control circuit; during a second frame subsequent to said first frame, applying the second image signals to a third group of pixels with the first polarity and a fourth group of pixels with the second polarity wherein said third group of the pixels is adjacent to said fourth group of the pixels with a second boundary therebetween, said second boundary being in a different position from said first boundary, wherein said third group of pixels is partly overlapped with the first group of pixels, and said fourth group of the pixels is partly overlapped with the first group of the pixels, and selection of the first and second polarities is performed by said selecting circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of driving an active matrix type liquid crystal display device comprising a video control circuit and a selecting circuit, comprising:
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producing first image signals with a negative polarity and a positive polarity by the video control circuit; during a first frame, applying first image signals to a first group of n signal lines with the negative polarity and a second group of n signal lines with the positive polarity, wherein said first group of the n signal lines is contiguous to said second group of the n signal lines with a first boundary therebetween where n is 2 or more; and producing second image signals with the negative polarity and the positive polarity by said video control circuit; during a second frame subsequent to said first frame, applying the second image signals to a third group of n signal lines with the negative polarity and a fourth group of n signal lines with the positive polarity wherein said third group of the n signal lines is contiguous to said fourth group of the n signal lines with a second boundary therebetween, wherein said second boundary is in a different position from said first boundary, and said third group of n signal lines includes at least one signal line of the first group of n signal lines, and said fourth group of n signal lines includes at least one signal line of the first group of n signal lines, and selection of the negative and positive polarities is performed by said selecting circuit. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A display device comprising:
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a display region constituted of display pixels arranged in a matrix form; and a circuit for forming an image signal which sequentially displays polarity patterns on the display region, said circuit comprising; a video control circuit for producing image signals with first and second polarities opposite to each other; and a selecting circuit for selecting one of the image signals with the first polarity or the image signals with the second polarity, wherein during a first frame, first image signals from the circuit are applied to a first group of pixels with the first polarity and a second group of pixels with the second polarity, wherein said first group of the pixels is adjacent to said second group of the pixels with a first boundary therebetween, during a second frame subsequent to said first frame, second image signals from the circuit are applied to a third group of pixels with the first polarity and a fourth group of pixels with the second polarity wherein said third group of the pixels is adjacent to said fourth group of the pixels with a second boundary therebetween, and said second boundary is in a different position from said first boundary, and said third group of pixels is partly overlapped with the first group of pixels, and said fourth group of the pixels is partly overlapped with the first group of the pixels. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. A display device comprising:
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a display region constituted of display pixels arranged in a matrix form; and a circuit for forming an image signal which sequentially displays polarity patterns on the display region, said circuit comprising; a video control circuit for producing image signals with negative and positive polarities; and a selecting circuit for selecting one of the image signals with the negative polarity or the image signals with the positive polarity, wherein during a first frame, first image signals from the circuit are applied to a first group of n signal lines with the negative polarity and a second group of n signal lines with the positive polarity, and said first group of the n signal lines is contiguous to said second group of the n signals with a first boundary therebetween where n is 2 or more, and during a second frame subsequent to said first frame, second image signals from the circuit are applied to a third group of n signal lines with the negative polarity and a fourth group of n signal lines with the positive polarity wherein said third group of the n signal lines is contiguous, to said fourth group of the n signal lines with a second boundary therebetween, wherein said second boundary is in a different position from said first boundary, and said third group of n signal lines includes at least one signal line of the first group of n signal lines, and said fourth group of n signal lines includes at least one signal line of the first group of n signal lines. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35, 36)
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Specification
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Current AssigneeSemiconductor Energy Laboratory Co., Ltd.
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Original AssigneeSemiconductor Energy Laboratory Co., Ltd.
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InventorsHirakata, Yoshiharu
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Primary Examiner(s)Hjerpe; Richard
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Assistant Examiner(s)LESPERANCE, JEAN E
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Application NumberUS10/281,959Publication NumberTime in Patent Office1,575 DaysField of Search345 87-100, 345/209, 345/204, 345/205, 348/93US Class Current345/87CPC Class CodesG09G 2310/0213 controlling the sequence of...G09G 2320/0209 Crosstalk reduction, i.e. t...G09G 2320/0247 Flicker reduction other tha...G09G 3/3614 Control of polarity reversa...G09G 3/3677 suitable for active matrice...G09G 3/3688 suitable for active matrice...
