Display device and electric equipment using the same
First Claim
1. A display device having a plurality of pixels arranged in matrix, comprising:
- a plurality of signal lines through which a signal is inputted to the plurality of pixels;
first and second signal line driver circuits for inputting the signal to the plurality of signal lines, the first signal line driver circuit having means for outputting video signals corresponding to digital video signals of n (where n is a natural number) bits to the plurality of signal lines, and the second signal line driver circuit having means for outputting video signals corresponding to digital video signals of m (where m is a natural number smaller than n) bits to the plurality of signal lines; and
means for selecting between a connection between the first signal line driver circuit and the plurality of signal lines and a connection between the second signal line driver circuit and the plurality of signal lines.
1 Assignment
0 Petitions
Accused Products
Abstract
A display device which can operate at low power consumption is provided. When multi gray scale display is conducted and when display in which the number of gray scales is reduced is conducted, signal line driver circuits having different structures (first signal line driver circuit and second signal line driver circuit) are provided according to the respective cases. Those signal line driver circuits are separately used to conduct the display. The signal line driver circuit having the structure according to the number of gray scales to be represented is used to conduct the display. Thus, redundant power consumption can be prevented in the display device. Further, a decoder is used as a scanning line driver circuit and pixel rows are selected in an arbitrary order. Therefore, a region displayed by the first signal line driver circuit or a region displayed by the second signal line driver circuit can be set in a frame. Accordingly, a region for which the multi gray scale display is required and a region for which the display in which the number of gray scales is reduced is sufficient are selected in one frame so that power consumption can be effectively reduced.
153 Citations
80 Claims
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1. A display device having a plurality of pixels arranged in matrix, comprising:
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a plurality of signal lines through which a signal is inputted to the plurality of pixels;
first and second signal line driver circuits for inputting the signal to the plurality of signal lines, the first signal line driver circuit having means for outputting video signals corresponding to digital video signals of n (where n is a natural number) bits to the plurality of signal lines, and the second signal line driver circuit having means for outputting video signals corresponding to digital video signals of m (where m is a natural number smaller than n) bits to the plurality of signal lines; and
means for selecting between a connection between the first signal line driver circuit and the plurality of signal lines and a connection between the second signal line driver circuit and the plurality of signal lines. - View Dependent Claims (2, 7, 10, 13, 16, 19, 22, 25, 28)
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3. A display device having a plurality of pixels arranged in matrix, comprising:
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a plurality of signal lines through which a signal is inputted to the plurality of pixels;
first and second signal line driver circuits for inputting the signal to the plurality of signal lines, the first signal line driver circuit having a function of holding digital video signals of n (where n is a natural number) bits corresponding to a row of the plurality of pixels, and the second signal line driver circuit having a function of holding digital video signals of m (where m is a natural number smaller than n) bits corresponding to the row of the plurality of pixels; and
means for selecting between a connection between the first signal line driver circuit and the plurality of signal lines and a connection between the second signal line driver circuit and the plurality of signal lines. - View Dependent Claims (4, 8, 11, 14, 17, 20, 23, 26, 29)
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5. A display device having a plurality of pixels arranged in matrix, comprising:
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a plurality of signal lines through which a signal is inputted to the plurality of pixels;
first and second signal line driver circuits for inputting the signal to the plurality of signal lines, the first signal line driver circuit having means for outputting video signals corresponding to digital video signals of n (where n is a natural number) bits to the plurality of signal lines, and the second signal line driver circuit operating at a lower drive frequency than that of the first signal line driver circuit and having means for outputting video signals corresponding to digital video signals of m (where m is a natural number smaller than n) bits to the plurality of signal lines; and
means for selecting between a connection between the first signal line driver circuit and the plurality of signal lines and a connection between the second signal line driver circuit and the plurality of signal lines. - View Dependent Claims (6, 9, 12, 15, 18, 21, 24, 27, 30)
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31. A display device having a plurality of pixels arranged in matrix, comprising:
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a plurality of signal lines through which a signal is inputted to the plurality of pixels;
first and second signal line driver circuits for inputting the signal to the plurality of signal lines, the first signal line driver circuit comprising a shift register, a first latch circuit and a second latch circuit for outputting video signals corresponding to digital video signals of n (where n is a natural number) bits to the plurality of signal lines, and the second signal line driver circuit comprising a shift register, a first latch circuit and a second latch circuit for outputting video signals corresponding to digital video signals of m (where m is a natural number smaller than n) bits to the plurality of signal lines; and
means for selecting between a connection between the first signal line driver circuit and the plurality of signal lines and a connection between the second signal line driver circuit and the plurality of signal lines. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39, 40)
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41. A display device having a plurality of pixels arranged in matrix, comprising:
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a plurality of signal lines through which a signal is inputted to the plurality of pixels;
first and second signal line driver circuits for inputting the signal to the plurality of signal lines, the first signal line driver circuit comprising at least one of latch circuit of holding digital video signals of n (where n is a natural number) bits corresponding to a row of the plurality of pixels, and the second signal line driver circuit comprising at least one of latch circuit of holding digital video signals of m (where m is a natural number smaller than n) bits corresponding to the row of the plurality of pixels; and
means for selecting between a connection between the first signal line driver circuit and the plurality of signal lines and a connection between the second signal line driver circuit and the plurality of signal lines. - View Dependent Claims (42, 43, 44, 45, 46, 47, 48, 49, 50)
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51. A display device having a plurality of pixels arranged in matrix, comprising:
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a plurality of signal lines through which a signal is inputted to the plurality of pixels;
first and second signal line driver circuits for inputting the signal to the plurality of signal lines, the first signal line driver circuit comprising a shift register, a first latch circuit and a second latch circuit for outputting video signals corresponding to digital video signals of n (where n is a natural number) bits to the plurality of signal lines, and the second signal line driver circuit operating at a lower drive frequency than that of the first signal line driver circuit and comprising a shift register, a first latch circuit and a second latch circuit for outputting video signals corresponding to digital video signals of m (where m is a natural number smaller than n) bits to the plurality of signal lines; and
means for selecting between a connection between the first signal line driver circuit and the plurality of signal lines and a connection between the second signal line driver circuit and the plurality of signal lines. - View Dependent Claims (52, 53, 54, 55, 56, 57, 58, 59, 60)
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61. A display device having a plurality of pixels arranged in matrix, comprising:
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a plurality of signal lines through which a signal is inputted to the plurality of pixels;
first and second signal line driver circuits for inputting the signal to the plurality of signal lines, the first signal line driver circuit having a function of holding digital video signals of n (where n is a natural number) bits corresponding to a row of the plurality of pixels, and the second signal line driver circuit operating at a lower drive frequency than that of the first signal line driver circuit and having a function of holding digital video signals of m (where m is a natural number smaller than n) bits corresponding to the row of the plurality of pixels; and
means for selecting between a connection between the first signal line driver circuit and the plurality of signal lines and a connection between the second signal line driver circuit and the plurality of signal lines. - View Dependent Claims (62, 63, 64, 65, 66, 67, 68, 69, 70)
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71. A display device having a plurality of pixels arranged in matrix, comprising:
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a plurality of signal lines through which a signal is inputted to the plurality of pixels;
first and second signal line driver circuits for inputting the signal to the plurality of signal lines, the first signal line driver circuit operating at a lower drive frequency than that of the first signal line driver circuit and having at least one of latch circuit of holding digital video signals of n (where n is a natural number) bits corresponding to a row of the plurality of pixels, and the second signal line driver circuit comprising at least one of latch circuit of holding digital video signals of m (where m is a natural number smaller than n) bits corresponding to the row of the plurality of pixels; and
means for selecting between a connection between the first signal line driver circuit and the plurality of signal lines and a connection between the second signal line driver circuit and the plurality of signal lines. - View Dependent Claims (72, 73, 74, 75, 76, 77, 78, 79)
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80. A display device according to claim 81, wherein an electronic device uses the display device.
Specification