Display device having scale factor provider controlled by temperature sensor, current sensor, and power controller and method of driving the same

1. A display device, comprising:

a display panel including a plurality of pixels;

a timing controller that calculates a frame load value corresponding to an image frame of input image data and generates image data by scaling grayscale values of the input image data using a scale factor;

a data driver that generates a data signal corresponding to the image data and supplies the data signal to the pixels; and

a scale factor generating circuit that sets a reference range based on a temperature of the display panel and a global current value that flows through the pixels, and generates the scale factor included within the reference range based on the frame load value and the global current value,

wherein a maximum value of the reference range is a first reference value, and a minimum value of the reference range is a second reference value,

wherein the scale factor generating circuit determines the first reference value as a first value and determines the second reference value as a second value different from the first value when the temperature of the display panel is equal to or less than a reference temperature, and

wherein the scale factor generating circuit determines the first reference value and the second reference value having smaller values as the temperature of the display panel increases when the temperature of the display panel is higher than the reference temperature.

2. The display device of claim 1 , wherein the scale factor generating circuit determines the first reference value and the second reference value according to the temperature of the display panel.

3. The display device of claim 2 , wherein the first value has a value of 1, and the second value has a value smaller than the first value.

4. The display device of claim 2 , wherein the reference temperature corresponds to a room temperature.

5. The display device of claim 1 , wherein the scale factor generating circuit determines the second reference value by comparing the global current value with a reference current value.

6. The display device of claim 5 , wherein the scale factor generating circuit determines the second reference value having a smaller value as a length of a section in which the global current value is greater than the reference current value for a unit time increases.

7. The display device of claim 1 , wherein the display panel is divided into a plurality of blocks, and

wherein the scale factor generating circuit includes a unit target current value generator circuit that generates a unit target current value based on the global current value corresponding to a reference block among the blocks.

8. The display device of claim 7 , wherein the scale factor generating circuit further includes:

a first scale factor data generator circuit that generates first scale factor data including the first reference value and a (2-1)th reference value based on the temperature of the display panel; and

a second scale factor data generator circuit that generates second scale factor data including a (2-2)th reference value based on a counting signal generated by comparing the global current value with the reference current value.

9. The display device of claim 8 , wherein the scale factor generating circuit further includes:

a first scale factor calculator circuit that generates a target current value based on the unit target current value and the frame load value, and generates a first calculated value based on the target current value and the global current value.

10. The display device of claim 9 , wherein the scale factor generating circuit further includes:

a second scale factor calculator circuit that generates a second calculated value corresponding to the scale factor based on the first scale factor data, the second scale factor data, and the first calculated value.

11. The display device of claim 10 , wherein the second scale factor calculator circuit determines a smaller value among the (2-1)th reference value and the (2-2)th reference value as the second reference value.

12. The display device of claim 10 , wherein the second scale factor calculator circuit generates the second calculated value having a same value as the first calculated value when the first calculated value is included within the reference range.

13. The display device of claim 10 , wherein the second scale factor calculator circuit generates the second calculated value having a same value as the first reference value when the first calculated value is greater than the reference range.

14. The display device of claim 10 , wherein the second scale factor calculator circuit generates the second calculated value having a same value as the second reference value when the first calculated value is less than the reference range.

15. A display device, comprising:

a display panel including a plurality of pixels,

a timing controller that calculates a frame load value corresponding to an image frame of input image data and generates image data by scaling grayscale values of the input image data using a scale factor;

a data driver that generates a data signal corresponding to the image data and supplies the data signal to the pixels;

a scale factor generating circuit that sets a reference range based on a temperature of the display panel and a global current value that flows through the pixels, and generates the scale factor included within the reference range based on the frame load value and the global current value,

a power supply that supplies a first power source voltage and a second power source voltage different from the first power source voltage to the display panel; and

a power controller that generates a power control signal that controls the power supply based on a comparison result of the global current value and the reference current value,

wherein the power supply reduces a voltage level of the first power source voltage based on the power control signal when the global current value is greater than the reference current value.

16. A method of driving a display device including a display panel including a plurality of pixels, the method comprising:

calculating a frame load value corresponding to an image frame of input image data;

setting a reference range based on a temperature of the display panel and a global current value flowing through the pixels;

generating a scale factor included within the reference range based on the frame load value and the global current value,

wherein a maximum value of the reference range is a first reference value, and a minimum value of the reference range is a second reference value;

generating image data by scaling grayscale values of the input image data using the scale factor; and

generating a data signal corresponding to the image data and supplying the data signal to the pixels,

wherein when the temperature of the display panel is equal to or less than a reference temperature, the method comprises:

determining the first reference value as a first value and determining the second reference value as a second value different from the first value, and

wherein when the temperature of the display panel is higher than the reference temperature the method comprises:

determining the first reference value and the second reference value having smaller values as the temperature of the display panel increases.

17. The method of claim 16 , wherein the first reference value is determined according to the temperature of the display panel, and

wherein the second reference value is determined according to the temperature of the display panel and a comparison result of the global current value and a reference current value.