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US 8,552,955 B2Granted
Receiver for an LCD source driver
AssigneeNovatek Microelectronics Corp.
InventorChe-Li Lin
Life of this patent
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Abstract
A receiver for an LCD source driver of an LCD panel includes a converter, a comparing circuit and a decoding circuit. The converter converts two pairs of differential current signals into two pairs of differential voltage signals. The comparing circuit is coupled to the converter for generating reference signals based on differences between the two pairs of differential voltage signals. The decoding circuit is coupled to the comparing circuit for generating data signals, clock signal, setting signals, and control signals based the reference signals.
Claims16
A receiver for a source driver of an LCD panel comprising:
- a converter for converting two pairs of differential current signals that are embedded with data signals and control signals sent from a timing controller from being two pairs of differential current signals into two pairs of differential voltage signals;
- a comparing circuit coupled to the converter for generating reference voltage signals based on differences between the two pairs of differential voltage signals, the comparing circuit comprising:
- a first and a fourth node for receiving a first pair of the two pairs of differential voltage signals;
- a second and a third node for receiving a second pair of the two pairs of differential voltage signals;
- a plurality of resistors for generating a plurality of input signals based on the two pairs of differential voltage signals;
- a plurality of comparators coupled to corresponding resistors for receiving corresponding input signals and thereby generating the reference voltage signals;
- a plurality of first resistors coupled in series between the first and fourth nodes of the comparing circuit;
- and
- a plurality of second resistors coupled in series between the second and third nodes of the comparing circuit;
- wherein a node between two first resistors is coupled to a node between two second resistors;
- and
- a decoding circuit coupled to the comparing circuit for generating the embedded data signals and control signals based on the reference voltage signals.
9 more elements
A source driver for driving an LCD panel comprising:
- a timing controller for transmitting a plurality of differential signals comprising a plurality of image data signals and a plurality of control signals;
- a receiver for receiving the plurality of differential signals, comprising:
- a comparing circuit coupled to the receiver for generating reference voltage signals based on differences between the plurality of differential voltage signals, the comparing circuit comprising:
- a first and a fourth node for receiving a first pair of two pairs of differential voltage signals of the plurality of differential signals;
- a second and a third node for receiving a second pair of the two pairs of differential voltage signals of the plurality of differential signals;
- a plurality of resistors for generating a plurality of input signals based on the two pairs of differential voltage signals;
- a plurality of comparators coupled to corresponding resistors for receiving corresponding input signals and thereby generating the reference voltage signals;
- a plurality of first resistors coupled in series between the first and fourth nodes of the comparing circuit;
- and
- a plurality of second resistors coupled in series between the second and third nodes of the comparing circuit;
- wherein a node between two first resistors is coupled to a node between two second resistors;
- and
- a decoder for generating the plurality of image data signals and the plurality of control signals in accordance with the plurality of compared signals;
- and
- a processing device for generating the driving signals to the LCD panel in accordance with the image data signals and the control signals, comprising:
- a data latch for latching the plurality of image data signals;
- a digital-to-analog-converter for converting the image data signals into a plurality of analog signals;
- and
- an output buffer for enhancing the driving ability of the analog signals.
16 more elements
A receiver for a source driver of an LCD panel comprising:
- a converter for converting two pairs of differential current signals that are embedded with data signals and control signals sent from a timing controller from being two pairs of differential current signals into two pairs of differential voltage signals;
- a comparing circuit coupled to the converter for generating reference voltage signals based on differences between the two pairs of differential voltage signals, the comparing circuit comprising:
- a first and a fourth node for receiving a first pair of the two pairs of differential voltage signals;
- a second and a third node for receiving a second pair of the two pairs of differential voltage signals;
- an output node;
- a first comparator including:
- a first input end coupled to the first node of the comparing circuit;
- a second input end coupled to the third node of the comparing circuit;
- and
- an output end coupled to the output node of the comparing circuit;
- a second comparator including:
- a first input end coupled to the second node of the comparing circuit;
- a second input end coupled to the third node of the comparing circuit;
- and
- an output end coupled to the output node of the comparing circuit;
- a third comparator including:
- a first input end coupled to the third node of the comparing circuit;
- a second input end coupled to the fourth node of the comparing circuit;
- and
- an output end coupled to the output node of the comparing circuit;
- a fourth comparator including:
- a first input end coupled to the first node of the comparing circuit;
- a second input end coupled to the fourth node of the comparing circuit;
- and
- an output end coupled to the output node of the comparing circuit;
- a fifth comparator including:
- a first input end coupled to the first node of the comparing circuit;
- a second input end coupled to the second node of the comparing circuit;
- and
- an output end coupled to the output node of the comparing circuit;
- and
- a sixth comparator including:
- a first input end coupled to the second node of the comparing circuit;
- a second input end coupled to the fourth node of the comparing circuit;
- and
- an output end coupled to the output node of the comparing circuit;
- and
- a decoding circuit coupled to the output node of the comparing circuit for generating the embedded data signals and control signals based on the reference voltage signals.
35 more elements
Dependencies are inferred from the claim text.