Active matrix display device and driving method thereof
First Claim
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1. A display device comprising:
- an A/D converter for converting an analog signal into a first digital signal;
a signal processor for converting said first digital signal to a numerical value of N-radix notation where N≧
3 and outputting a second signal based on the numerical value of N-radix notation;
a shift register connected to said signal processor;
a plurality of first signal lines connected to said shift register wherein a plurality of pulses are applied to corresponding one of said first signal lines based on said second signal;
a plurality of second signal lines extending across said plurality of first signal lines to define a plurality of pixels; and
a thin film transistor provided in one of said plurality of pixels,wherein a width and a height of the plurality of pulses are determined based on the second signal.
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Abstract
For a gradation displaying operation of an electro-optical device, a gradation display method and an electro-optical device therefor which can be controlled with a digital signal, and which is hard to be affected by variation in characteristics between elements and can achieve high gradation display are provided. In the active matrix type of electro-optical device and method, the input analog signal is converted to a numerical value of N-radix notation, and pulses whose pulse height and width correspond to the numerical value. By applying these plural pulses to each picture element electrode, an average voltage of one frame of an image can be made an arbitrary value to finally display an intermediate color tone or gradation. The display device comprises a device for converting an input analog signal to a digital signal, a device for converting the digital signal to a numerical value of N-radix notation or a digital signal corresponding thereto (including digital signal), and a device for inputting this signal to an active matrix type device.
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Citations
20 Claims
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1. A display device comprising:
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an A/D converter for converting an analog signal into a first digital signal; a signal processor for converting said first digital signal to a numerical value of N-radix notation where N≧
3 and outputting a second signal based on the numerical value of N-radix notation;a shift register connected to said signal processor; a plurality of first signal lines connected to said shift register wherein a plurality of pulses are applied to corresponding one of said first signal lines based on said second signal; a plurality of second signal lines extending across said plurality of first signal lines to define a plurality of pixels; and a thin film transistor provided in one of said plurality of pixels, wherein a width and a height of the plurality of pulses are determined based on the second signal. - View Dependent Claims (2, 3, 4, 5)
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6. A display device comprising:
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an A/D converter for converting an analog signal into a first digital signal; a signal processor for converting said first digital signal to a numerical value of N-radix notation where N≧
3 and outputting a second signal based on the numerical value of N-radix notation;a first shift register connected to said signal processor; a second shift register connected to said signal processor wherein said second shift register receives clock pulses from said signal processor; a plurality of first signal lines connected to said first shift register wherein a plurality of pulses are applied to corresponding one of said first signal lines based on said second signal; a plurality of second signal lines extending across said plurality of first signal lines to define a plurality of pixels wherein said second signal lines are connected to said second shift register; and a thin film transistor provided in one of said plurality of pixels, wherein a width and a height of the plurality of pulses are determined based on the second signal. - View Dependent Claims (7, 8, 9, 10)
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11. A display device comprising:
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an A/D converter for converting an analog signal into a first digital signal; a signal processor for converting said first digital signal to a numerical value of N-radix notation where N≧
3 and outputting a second signal based on the numerical value of N-radix notation;a shift register connected to said signal processor; a plurality of first signal lines connected to said shift register wherein a plurality of pulses are applied to corresponding one of said first signal lines from said shift register based on said second signal; a plurality of second signal lines extending across said plurality of first signal lines to define a plurality of pixels; and a thin film transistor provided in one of said plurality of pixels, wherein a voltage generating circuit is connected to said shift register, wherein a width and a height of the plurality of pulses are determined based on the second signal. - View Dependent Claims (12, 13, 14, 15)
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16. A display device comprising:
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an A/D converter for converting an analog signal into a first digital signal; a signal processor for converting said first digital signal to a numerical value of N-radix notation where N≧
3 and outputting a second signal based on the numerical value of N-radix notation;a shift register connected to said signal processor; a plurality of first signal lines connected to said shift register wherein a plurality of pulses are applied to corresponding one of said first signal lines; a voltage generating circuit connected to said plurality of first signal lines wherein said plurality of pulses are supplied from said voltage generating circuit; a plurality of second signal lines extending across said plurality of first signal lines to define a plurality of pixels; and a thin film transistor provided in one of said plurality of pixels, wherein a width and a height of the plurality of pulses are determined based on the second signal. - View Dependent Claims (17, 18, 19, 20)
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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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InventorsHiroki, Masaaki, Takemura, Yasuhiko, Yamazaki, Shunpei
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Primary Examiner(s)CHANG, KENT WU
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Application NumberUS09/985,395Publication NumberTime in Patent Office1,719 DaysField of Search345/94, 345/95, 345/208, 345/209, 345/89, 345/67, 345/77, 345/63, 345/100US Class Current345/208CPC Class CodesG09G 2300/08 Active matrix structure, i....G09G 3/2014 by modulation of the durati...G09G 3/2029 the sub-frames having non-b...G09G 3/2081 with combination of amplitu...G09G 3/3648 using an active matrix G09G...
