Display apparatus, source driver, and display panel driving method

1. A display apparatus, comprising:

a display panel including a data line; and

a source driver coupled to said display panel to supply a data signal to the data line, said data signal having a polarity determined based on a polarity signal,

wherein the source driver includes:

a control circuit; and

an amplifier used to generate the data signal with an offset voltage, which is constructed to invert a polarity of said offset voltage based on an offset cancel control signal from said control circuit,

wherein the control circuit generates the offset cancel control signal based on the polarity signal and a gate start pulse signal, and

wherein the gate start pulse signal indicates a start of a frame period to invert the offset cancel control signal every predetermined number of frame periods.

2. A display apparatus according to claim 1 , wherein the source driver further includes a D/A (Digital to Analog) converter supplied with a set of grayscale voltages to select and output one of said grayscale voltages based on display data, and

wherein the amplifier includes an output amplifier to generate the data signal based on the selected grayscale voltage.

3. A display apparatus according to claim 2 , wherein the control circuit includes a divider circuit responsive to the polarity signal to generate a ½-divided signal, and

wherein the offset cancel control signal is responsive to the ½-divided signal.

4. A display apparatus according to claim 3 , further comprising a gate driver coupled to said display panel to scan gate lines thereof in response to the gate start pulse signal,

wherein the control circuit generates the offset cancel control signal based on the ½-divided signal and the gate start pulse signal.

5. A display apparatus according to claim 4 , wherein the control circuit further includes a ¼-divider circuit responsive to the gate start pulse signal to generate a ¼-divided signal, and

wherein the control circuit generates the offset cancel control signal based on the ½-divided signal and the ¼-divided signal.

6. A display apparatus according to claim 1 , wherein the source driver further includes:

a grayscale voltage generating circuit for generating a set of grayscale voltages;

a D/A converter supplied with said grayscale voltages to select one of said grayscale voltages based on display data; and

an output amplifier responsive to said one of grayscale voltages from the D/A converter to generate the data signal; and

the amplifier includes a γ-amplifier which is integrated in the grayscale voltage generating circuit and used to generate the set of grayscale voltages.

7. A display apparatus according to claim 1 , wherein:

the source driver further includes:

a grayscale voltage generating circuit for generating a set of grayscale voltages;

a D/A converter supplied with said set of grayscale voltages to select one of grayscale voltages based on display data;

an output amplifier responsive to said grayscale voltage from the D/A converter to generate the data signal; and

a γ-amplifier which is integrated in the grayscale voltage generating circuit and used to generate the set of grayscale voltages.

8. A display apparatus, comprising:

a display panel including a data line; and

a source driver coupled to said panel to supply a data signal to the data line, said data signal having a polarity determined based on a polarity signal,

wherein the source driver includes:

a control circuit, and

an amplifier used to generate the data signal with an offset voltage, which is constructed to invert a polarity of said offset voltage based on an offset cancel control signal from said control circuit,

wherein the control circuit generates the offset cancel control signal based on the polarity signal and a gate start pulse signal,

the display apparatus further comprising a gate driver coupled to the panel to scan gate lines in response to the gate start pulse signal,

wherein the gate driver activates the gate lines in order from one of the gate lines which is adjacent to the source driver,

wherein a timing at which the gate start pulse signal is activated is synchronized with a vertical synchronization signal, and

wherein the gate start pulse signal is applied to invert the polarity of the offset voltage by the source driver.

9. The display apparatus of claim 1 , wherein the gate start pulse signal serves as a trigger for causing a gate driver to start a scanning of gate lines, and

wherein a cycle at which a polarity of the offset voltage is inverted is controlled, by the source driver, corresponding to a cycle at which a polarity of the data signal is inverted based on the offset cancel control signal.