Timing controller and display device including the same

1 . An electronic device comprising:

a display device comprising:

a display panel driven in units of frames, and including a plurality of pixels in a display region defined therein, wherein the plurality of pixels emits light based on an emission signal; and

a timing controller which receives an image signal and drives the display panel,

wherein the timing controller includes:

a gray level setting circuit which calculates a plurality of representative gray levels by dividing the display region into a plurality of regions, based on the image signal;

a signal determining circuit which receives a plurality of lookup tables storing a duty ratio of the emission signal and selects one of the plurality of lookup tables based on a lookup table comparison histogram, wherein the lookup table comparison histogram is generated based on the plurality of lookup tables and the plurality of representative gray levels; and

a correcting circuit which controls the duty ratio of the emission signal provided during a frame, based on the one of the plurality of lookup tables.

2 . The electronic device of claim 1 , wherein the frame includes:

a first period and a second period subsequent to the first period, and

wherein a first pulse width of the emission signal during the first period is different from a second pulse width of the emission signal during the second period.

3 . The electronic device of claim 1 , wherein the gray level setting circuit generates a gray level signal through gamma conversion on the image signal.

4 . The electronic device of claim 3 , wherein the gray level setting circuit calculates the plurality of representative gray levels by averaging the gray level signal with respect to the plurality of regions.

5 . The electronic device of claim 1 , wherein the signal determining circuit calculates a first histogram obtained by counting and classifying the plurality of representative gray levels depending on a grayscale range.

6 . The electronic device of claim 5 , wherein the signal determining circuit receives a plurality of gray level weights varying depending on the grayscale range and further calculates a second histogram based on the gray level weights and the first histogram.

7 . The electronic device of claim 6 , wherein the one of the plurality of lookup tables is a lookup table, which has a maximum value, among the plurality of lookup tables, based on a result obtained by performing a computation operation with respect to the second histogram and each of the plurality of lookup tables.

8 . The electronic device of claim 1 , wherein the timing controller drives one of the units of the frames of the display panel at a first driving frequency, and drives another of the units of the frames of the display panel at a second driving frequency different from the first driving frequency.

9 . The electronic device of claim 1 , wherein each of the plurality of pixels includes:

a light emitting element and a pixel driving circuit connected to the light emitting element,

wherein the pixel driving circuit includes:

a first transistor;

a second transistor connected to receive a data signal; and

a third transistor electrically connected to the first transistor and including a gate electrode connected to receive the emission signal.

10 . The electronic device of claim 9 , wherein the pixel driving circuit further includes:

a fourth transistor including a gate electrode connected to receive a first scan signal, and

wherein the timing controller adjusts the first scan signal based on the plurality of lookup tables.

11 . The electronic device of claim 10 , wherein the frame includes a first period and a second period subsequent to the first period, and

wherein a first pulse width of the first scan signal during the first period is different from a second pulse width of the first scan signal during the second period.

12 . The electronic device of claim 9 , wherein the pixel driving circuit further includes:

a fifth transistor including a gate electrode connected to receive a bias voltage, and

wherein the timing controller adjusts a waveform of the bias voltage based on the plurality of lookup tables.

13 . The electronic device of claim 12 , wherein the frame includes:

a first period and a second period subsequent to the first period, and

wherein a voltage level of the bias voltage during the first period is different from a voltage level of the bias voltage during the second period.

14 . A timing controller for driving a display panel in units of frames, wherein the timing controller receives an image signal and the display panel includes a pixel in a display region defined therein to receive an emission signal, the timing controller comprising:

a gray level setting circuit which calculates a plurality of representative gray levels by dividing the display region into a plurality of regions, based on the image signal;

a signal determining circuit which receives a plurality of lookup tables storing a duty ratio of the emission signal and selects one of the plurality of lookup tables based on a lookup table comparison histogram, wherein the lookup table comparison histogram is generated based on the plurality of lookup tables and the plurality of representative gray levels; and

a correcting circuit which controls the duty ratio of the emission signal, based on the one of the plurality of lookup tables.

15 . The timing controller of claim 14 , wherein the gray level setting circuit generates a gray level signal by performing gamma conversion on the image signal.

16 . The timing controller of claim 15 , wherein the gray level setting circuit calculates the plurality of representative gray levels by averaging the gray level signal with respect to the plurality of regions.

17 . The timing controller of claim 14 , wherein the signal determining circuit calculates a first histogram obtained by counting the plurality of regions depending on a grayscale range, based on the plurality of representative gray levels.

18 . The timing controller of claim 17 , wherein the signal determining circuit receives a plurality of gray level weights varying depending on the grayscale range and further calculates a second histogram based on the gray level weights and the first histogram.

19 . The timing controller of claim 18 , wherein the one of the plurality of lookup tables is a lookup table, which has a maximum value among values obtained by performing a computation operation with respect to the second histogram and each of the plurality of lookup tables.

20 . The timing controller of claim 19 , wherein one of the units of the frames is driven at a first driving frequency, and another of the units of the frames is driven at a second driving frequency different from the first driving frequency.