Data processing circuit, display device, and mobile terminal
First Claim
1. A data processing circuit characterized by comprising:
- first level-conversion means for level-converting a data signal having a first voltage amplitude input in series to a data signal having a second voltage amplitude larger than the first voltage amplitude;
serial-parallel conversion means for converting the data signal level-converted by the first level-conversion means to parallel data signals; and
second level-conversion means for level-converting the parallel data signals to data signals having a third voltage amplitude smaller than the second voltage amplitude, and characterized in that the data processing circuit is formed on an insulating substrate by using thin-film transistors.
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Accused Products
Abstract
When a data processing circuit is formed on an insulating substrate by using TFTs, it is difficult to process a data signal having a high data rate, such as digital display data, at a high speed.
In a data processing circuit formed on an insulating substrate by using TFTs, a data signal having a small voltage amplitude input in series is increased in level to a data signal having a large voltage amplitude by a level shift circuit (11), the serial data signal having the large voltage amplitude is converted to parallel data signals by a serial-parallel conversion circuit (12), and then, the parallel data signals are reduced in level to data signals having a small voltage amplitude by level shift circuits (13A and 13B). Therefore, high-speed processing can be applied to digital data signals at a low power consumption.
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Citations
7 Claims
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1. A data processing circuit characterized by comprising:
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first level-conversion means for level-converting a data signal having a first voltage amplitude input in series to a data signal having a second voltage amplitude larger than the first voltage amplitude;
serial-parallel conversion means for converting the data signal level-converted by the first level-conversion means to parallel data signals; and
second level-conversion means for level-converting the parallel data signals to data signals having a third voltage amplitude smaller than the second voltage amplitude, and characterized in that the data processing circuit is formed on an insulating substrate by using thin-film transistors. - View Dependent Claims (2)
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3. A display apparatus characterized by comprising:
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a display section formed of pixels disposed in a matrix manner on a transparent, insulating substrate;
a plurality of horizontal driving circuits mounted on the transparent, insulating substrate together with the display section, for writing display data into the pixels in the display section; and
a data processing circuit mounted on the transparent, insulating substrate together with the display section, for processing a display data signal having a first voltage amplitude input in series from the outside of the substrate and for sending to the plurality of horizontal driving circuits, and characterized in that the data processing circuit is formed of thin-film transistors, and the data processing circuit comprises first level-conversion means for level-converting the display data signal having the first voltage amplitude to a display data signal having a second voltage amplitude larger than the first voltage amplitude;
serial-parallel conversion means for converting the display data signal level-converted by the first level-conversion means to parallel display data signals; and
second level-conversion means for level-converting the parallel display data signals to display data signals having a third voltage amplitude smaller than the second voltage amplitude and for sending the display data signals to the plurality of horizontal driving circuits. - View Dependent Claims (4, 5, 6)
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7. A portable terminal characterized by having mounted thereon a display apparatus as a screen display section, the display apparatus comprising:
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a display section formed of pixels disposed in a matrix manner on a transparent, insulating substrate;
a plurality of horizontal driving circuits mounted on the transparent, insulating substrate together with the display section, for writing display data into the pixels in the display section; and
a data processing circuit mounted on the transparent, insulating substrate together with the display section, for processing a display data signal having a first voltage amplitude input in series from the outside of the substrate and for sending to the plurality of horizontal driving circuits, wherein the data processing circuit is formed of thin-film transistors, and the data processing circuit comprises first level-conversion means for level-converting the display data signal having the first voltage amplitude to a display data signal having a second voltage amplitude larger than the first voltage amplitude;
serial-parallel conversion means for converting the display data signal level-converted by the first level-conversion means to parallel display data signals; and
second level-conversion means for level-converting the parallel display data signals to display data signals having a third voltage amplitude smaller than the second voltage amplitude and for sending the display data signals to the plurality of horizontal driving circuits.
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Specification