Signal processing circuit, low-voltage signal generator, and image display incorporating the same
First Claim
1. A low-voltage signal generator provided in a signal processing integrated circuit including integrated therein circuits requiring high-amplitude logic signals and circuits operable with low-amplitude logic signals, comprising all within the integrated circuit:
- a first logic operation circuit which performs a logic operation using a high-amplitude logic signal;
a transmission system having a load capacitance,wherein the low-voltage signal generator transforms a high-amplitude logic signal to a low-amplitude logic signal having a lower amplitude than the high-amplitude logic signal; and
transistors forming a gate circuit, wherein;
each transistor belongs to either a low level output group or a high level output group; and
each transistor belonging to the low level output group is fed at a gate thereof with the high-amplitude logic signal and at an input end thereof with any one of a low-amplitude logic signal which remains at a low level throughout a period in which the high-amplitude logic signal is applied to the gate, a low level potential from a low level source for use to produce the low-amplitude logic signal, and a low level potential from a high level source for use to produce the high-amplitude logic signal, and outputs a low level potential of a low-amplitude logic signal through an output end thereof; and
each transistor belonging to the high level output group is fed at a gate thereof with the high-amplitude logic signal and at an input end thereof with either one of a low-amplitude logic signal which remains at a high level throughout the period and a high level potential from the low level source, and outputs a high level potential of a low-amplitude logic signal through an output end thereof.
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Abstract
There are provided: a first logic operation circuit which performs a logic operation using a high-amplitude logic signal; a transmission system having a load capacitance; and a low-voltage signal generator which is a step-down level shifter transforming an incoming high-amplitude logic signal from the first logic operation circuit to a low-amplitude logic signal having a lower amplitude than the high-amplitude logic signal for output to the transmission system. In the configuration, the first logic operation circuit operates based on a high-amplitude logic signal, and is therefore free from malfunctions and performs operations at high speed. Further, the transmission system introducing a load capacitance transmits a low-amplitude logic signal and therefore restrains increases in electric power consumption and occurrence of unnecessary radiation.
23 Citations
18 Claims
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1. A low-voltage signal generator provided in a signal processing integrated circuit including integrated therein circuits requiring high-amplitude logic signals and circuits operable with low-amplitude logic signals, comprising all within the integrated circuit:
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a first logic operation circuit which performs a logic operation using a high-amplitude logic signal; a transmission system having a load capacitance, wherein the low-voltage signal generator transforms a high-amplitude logic signal to a low-amplitude logic signal having a lower amplitude than the high-amplitude logic signal; and transistors forming a gate circuit, wherein;
each transistor belongs to either a low level output group or a high level output group; and
each transistor belonging to the low level output group is fed at a gate thereof with the high-amplitude logic signal and at an input end thereof with any one of a low-amplitude logic signal which remains at a low level throughout a period in which the high-amplitude logic signal is applied to the gate, a low level potential from a low level source for use to produce the low-amplitude logic signal, and a low level potential from a high level source for use to produce the high-amplitude logic signal, and outputs a low level potential of a low-amplitude logic signal through an output end thereof; andeach transistor belonging to the high level output group is fed at a gate thereof with the high-amplitude logic signal and at an input end thereof with either one of a low-amplitude logic signal which remains at a high level throughout the period and a high level potential from the low level source, and outputs a high level potential of a low-amplitude logic signal through an output end thereof. - View Dependent Claims (2, 3, 4, 5)
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6. An image display, comprising:
- pixels arranged in a matrix;
data signal lines each provided for a different column of pixels;
scan signal lines each provided for a different row of pixels;
a data signal line drive circuit driving the data signal lines; and
a scan signal line drive circuit driving the scan signal lines,wherein either one, or both, of the data signal line drive circuit and the scan signal line drive circuit include(s);
a first logic operation circuit which performs a logic operation using a high-amplitude logic signal;
a transmission system having a load capacitance; and
a low-voltage signal generator which is a step-down level shifter transforming an incoming high-amplitude logic signal from the first logic operation circuit to a low-amplitude logic signal having a lower amplitude than the high-amplitude logic signal for output to the transmission system. - View Dependent Claims (7, 8, 9, 10, 11, 12, 16, 17, 18)
- pixels arranged in a matrix;
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13. A low-voltage signal generator provided in a signal processing circuit including:
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a first logic operation circuit which performs a logic operation using a high-amplitude logic signal; a transmission system having a load capacitance, wherein the low-voltage signal generator transforms a high-amplitude logic signal to a low-amplitude logic signal having a lower amplitude than the high-amplitude logic signal; transistors forming a gate circuit, wherein; each transistor belongs to either a low level output group or a high level output group; each transistor belonging to the low level output group is fed at a gate thereof with the high-amplitude logic signal and at an input end thereof with any one of a low-amplitude logic signal which remains at a low level throughout a period in which the high-amplitude logic signal is applied to the gate, a low level potential from a low level source for use to produce the low-amplitude logic signal, and a low level potential from a high level source for use to produce the high-amplitude logic signal, and outputs a low level potential of a low-amplitude logic signal through an output end thereof; and each transistor belonging to the high level output group is fed at a gate thereof with the high-amplitude logic signal and at an input end thereof with either one of a low-amplitude logic signal which remains at a high level throughout the period and a high level potential from the low level source, and outputs a high level potential of a low-amplitude logic signal through an output end thereof. - View Dependent Claims (14, 15)
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Specification