Display device and method for driving the same
A display device includes a display panel, a timing controller, a gate driver, a pulse width controller, and a data driver. The display panel has pixels divided by gate lines arranged in first direction and data lines arranged in second direction. The timing controller generates gate control signals and first source output enable signal. The gate driver provides gate lines with scan signals in response to gate control signals. The pulse width controller varies some of the pulse widths of the first source output enable signal to generate second source output enable signal. The data driver performs charge sharing on data lines based on the second source output enable signal so that pre-charge voltage is formed at data lines, and provides data lines with data voltages based on the second source output enable signal.
1. A display device comprising:
a display panel that has a plurality of pixels that are divided by a plurality of gate lines arranged in a first direction and a plurality of data lines arranged in a second direction substantially perpendicular to the first direction;
a timing controller configured to generate at least one gate control signal and a first source output enable signal;
a gate driver configured to provide the gate lines with a plurality of scan signals in response to the at least one gate control signal;
a pulse width controller configured to vary a pulse width of the first source output enable signal to generate a second source output enable signal that has a varied pulse width; and
a data driver configured to output a data voltage to the data lines in response to a low level period of the second source output enable signal, and output a pre-charge voltage to the data lines in response to a pulse of the second output enable signal, wherein the pre-charge voltage is generated when the data lines are electrically connected to each other,
wherein the second source output enable signal varies an output time of the data voltage and the pre-charge voltage from the data driver according to an average data of a present frame,
wherein the pulse width of the second source output enable signal increases when a difference between a reference data and the average data is larger than a predetermined value, and
the average data is obtained as an average value of data signals of pixels connected to a gate line or to a plurality of gate lines.
2. The display device of claim 1 , where the pulse width controller includes:
a data processing unit that processes red pixel data, green pixel data and blue pixel data to obtain the average data;
a memory configured to store the reference data signal and the average datal;
a comparator configured to compare the reference data signal to the average data signal to generate a pulse width control signal; and
a pulse width regulator configured to vary the pulse width of the first source output enable signal in response to the pulse width control signal to generate the second source output enable signal.
3. The display device of claim 2 , where the reference data corresponds to an average value of data signals of one, some, or all frames, or a modal value among the data signals of all frames.
4. The display device of claim 1 , where the timing controller generates a polarity control signal for controlling a polarity of the data voltages.
5. The display device of claim 1 , where the pulse width controller comprises a unitary part of the timing controller.
6. The display device of claim 1 , where the pulse width controller comprises a unitary part of the data driver.
7. The display device of claim 1 , where the pulse width controller is separate from the timing controller and the data driver.
8. A method of driving a display device, the method comprising:
generating at least one gate control signal and a first source output enable signal;
providing a plurality of gate lines of a display panel with a plurality of scan signals in response to the at least one gate control signal;
varying a pulse width of the first source output enable signal to generate a second source output enable signal;
providing a pre-charge voltage to data lines of a display panel in response to a pulse of the second output enable signal, wherein the pre-charge voltage is generated when the data lines are electrically connected to each other, and
providing data voltages to the data lines in response to a low level period of the second source output enable signal,
wherein the second source output enable signal varies an output time of the data voltage and the pre-charge voltage from the data driver according to an average data of a present frame,
wherein the pulse width of the second source output enable signal increases when a difference between a reference data and the average data is larger than a predetermined value, and
the average data is obtained as an average value of data signals of pixels connected to a gate line of the display panel or to a plurality of gate lines of the display panel.
9. The method of claim 8 , the varying a pulse width of the first source output enable signal to generate a second source output enable signal comprising:
receiving red pixel data, green pixel data and blue pixel data to obtain the average data; and
varying the pulse width of the first source output enable signal based on the average data signal to generate the second source output enable signal.
10. The method of claim 8 , the varying a pulse width of the first source output enable signal to generate a second source output enable signal comprising:
receiving red pixel data, green pixel data and blue pixel data to obtain the average data;
storing the reference data and the average data;
comparing the reference data with the average data signal to generate a pulse width control signal; and
varying the pulse width of the first source output enable signal in response to the pulse width control signal to generate the second source output enable.
11. The method of claim 10 , where the reference data corresponds to an average value of data signals of one, some, or all frames, or a modal value among the data signals of all frames.
12. The method of claim 8 , further comprising generating a polarity control signal that controls a polarity of the data voltages and a polarity of the pre-charge voltage.