DIFFERENTIAL SIGNALING SYSTEM AND FLAT PANEL DISPLAY WITH THE SAME
First Claim
1. A differential signaling system comprising:
- a differential signal line having a first wiring and a second wiring coupled between a sending end and a receiving end of the system;
a termination resistor coupled between the first wiring and the second wiring in the receiving end side of the system; and
a test circuit coupled to the termination resistor in parallel to amplify and detect a variation of a differential impedance due to the differential signal line,wherein the test circuit includes;
a differential test amplifier to amplify the variation in the differential impedance of the first wiring or the second wiring,a switching unit installed at an input terminal of the differential test amplifier used for controlling an operation of the differential test amplifier,a peak detector to convert an output signal of the differential test amplifier into a direct current component, anda phase detector to detect a phase difference of a differential signal transmitted in the differential signal line.
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Accused Products
Abstract
A differential signaling system, wherein a first wiring and a second wiring are coupled between a sending end and a receiving end as a differential signal line. A termination resistor is coupled between the first wiring and the second wiring in the receiving end side. A test circuit is coupled to the termination resistor in parallel, and amplifies and detects a variation of a differential impedance due to the differential signal line. The test circuit includes: a differential test amplifier for amplifying a variation in the differential impedance of the first wiring or the second wiring; a switching unit installed at an input terminal of the differential test amplifier for controlling an operation of the differential test amplifier; and a peak detector for converting an output signal of the differential test amplifier into a direct current component; and a phase detector for detecting a skew, a time delay, and/or a phase difference of a signal inputted to the differential signal line.
37 Citations
21 Claims
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1. A differential signaling system comprising:
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a differential signal line having a first wiring and a second wiring coupled between a sending end and a receiving end of the system; a termination resistor coupled between the first wiring and the second wiring in the receiving end side of the system; and a test circuit coupled to the termination resistor in parallel to amplify and detect a variation of a differential impedance due to the differential signal line, wherein the test circuit includes; a differential test amplifier to amplify the variation in the differential impedance of the first wiring or the second wiring, a switching unit installed at an input terminal of the differential test amplifier used for controlling an operation of the differential test amplifier, a peak detector to convert an output signal of the differential test amplifier into a direct current component, and a phase detector to detect a phase difference of a differential signal transmitted in the differential signal line. - View Dependent Claims (2, 3, 4, 5, 11)
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6. A flat panel display comprising:
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a display panel in which a plurality of data wirings and gate wirings are arranged to intersect each other; a controller to receive an image signal from an exterior and to generate a control signal, and to output the image signal and the control signal through a differential signal line having the first and second wirings; a gate driver to receive the control signal from the controller and apply a scan signal to the gate wirings; a data driver including a plurality of data driving circuits to receive the image signal and/or the control signal from the controller through the first and second wirings and apply the image signal to the data wirings; and a test circuit coupled to the termination resistor in parallel to amplify and detect a variation of a differential impedance due to the differential signal line, wherein the test circuit includes; a differential test amplifier to amplify the variation in the differential impedance of the first wiring or the second wiring, a switching unit installed at an input terminal of the differential test amplifier used for controlling an operation of the differential test amplifier, a peak detector to convert an output signal of the differential test amplifier into a direct current component, and a phase detector to detect a phase difference of a differential signal transmitted in the differential signal line. - View Dependent Claims (7, 8, 9, 10, 12)
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13. A differential signaling circuit, comprising:
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a sending end and a receiving end of the differential signaling circuit; a first wiring and a second wiring to connect the sending end and the receiving end, and to carry a differential signal between the sending end and the receiving end; and a test circuit positioned at the receiving end and connected to the first and second wirings, the test circuit detecting a phase difference of a differential signal transmitted in the differential signal line which is indicative of an impedance variance in the differential signaling circuit. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A method of detecting a variance in an impedance of a differential signaling circuit, comprising:
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transmitting a differential signal over a first wiring and a second wiring of the differential signaling circuit to connect a sending end and a receiving end of the differential signaling circuit; and detecting a skew or a time delay in different modes of the differential signal, which is indicative of an impedance variance in the differential signaling circuit. - View Dependent Claims (20, 21)
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Specification