US 9,311,844 B2 · Source driver and method to reduce peak current therein

Abstract

A source driver and a method to reduce peak current of the source driver are provided. The source driver includes a latch circuit, a level shifter and a digital-to-analog converter (DAC) circuit. The latch circuit latches current bit-data. The latch circuit is coupled to an input terminal of the level shifter. The DAC circuit is coupled to an output terminal of the level shifter. When the current bit-data is not a complement of previous bit-data, the latch circuit selects and outputs the current bit-data to the input terminal of the level shifter, and the DAC circuit outputs a voltage corresponding to the output data of the level shifter. When the current bit-data is the complement of the previous bit-data, the latch circuit selects and outputs the previous bit-data to the input terminal of the level shifter, and the DAC circuit outputs a voltage corresponding to the current bit-data.

Claims16

Dependent claims

A source driver, comprising:

a level shifter;
a latch circuit, latching at least one current bit-data, wherein the latch circuit selects and outputs the at least one current bit-data to an input terminal of the level shifter to replace at least one previous bit-data when the at least one current bit-data is not a complement of the at least one previous bit-data, and the latch circuit selects and outputs the at least one previous bit-data to the input terminal of the level shifter when the at least one current bit-data is the complement of the at least one previous bit-data;
and
a digital-to-analog converter (DAC) circuit, coupled to an output terminal of the level shifter, wherein the DAC circuit outputs a voltage corresponding to output data of the level shifter when the at least one current bit-data is not a complement of the at least one previous bit-data, and the DAC circuit outputs a voltage corresponding to the at least one current bit-data when the at least one current bit-data is the complement of the at least one previous bit-data.

1 more element

A method for reducing peak current of a source driver, comprising:

comparing at least one current bit-data and at least one previous bit-data;
selecting and outputting the at least one current bit-data to an input terminal of a level shifter of the source driver to replace the at least one previous bit-data when the at least one current bit-data is not a complement of the at least one previous bit-data;
using a digital-to-analog converter (DAC) circuit to convert output data of the level shifter to a corresponding voltage when the at least one current bit-data is not a complement of the at least one previous bit-data;
selecting and outputting the at least one previous bit-data to the input terminal of the level shifter when the at least one current bit-data is the complement of the at least one previous bit-data;
and
using the DAC circuit to output a voltage corresponding to the at least one current bit-data when the at least one current bit-data is the complement of the at least one previous bit-data.

3 more elements

Dependencies are inferred from the claim text.

Source driver and method to reduce peak current therein

Life of this patent

Source driver and method to reduce peak current therein

Life of this patent

Abstract

Claims16