Display device and method of operation thereof

1 . A display device comprising:

a display panel including a plurality of pixels;

a temperature sensor which detects an ambient temperature and outputs a first temperature signal corresponding to the detected ambient temperature;

a temperature calculator which calculates the ambient temperature using current flowing through a transistor included in the temperature calculator and outputs a second temperature signal corresponding to the calculated ambient temperature;

a memory which receives a memory power supply voltage and stores a compensation signal according to characteristics of the plurality of pixels;

a driving controller which receives the first temperature signal from the temperature sensor, the second temperature signal from the temperature calculator, and an input image signal, and provides the display panel with an output image signal which is obtained by compensating for the input image signal based on the compensation signal from the memory; and

a voltage generator which generates the memory power supply voltage in response to a voltage control signal from the driving controller,

wherein the driving controller outputs the voltage control signal based on a temperature signal which indicates a lower temperature among the first temperature signal and the second temperature signal such that the memory power supply voltage has a first voltage level or a second voltage level,

wherein the memory power supply voltage remains constant at the first voltage level such that a voltage level of the compensation signal output from the memory is within a normal range when the temperature signal is lower than or equal to a reference temperature, and

wherein the memory power supply voltage remains constant at the second voltage level lower than the first voltage level when the temperature signal is higher than the reference temperature.

2 . The display device of claim 1 ,

wherein the pixel includes a transistor and a light emitting element electrically connected to the transistor, and

wherein the compensation signal includes deterioration information of the transistor

and the light emitting element.

3 . A display device comprising:

a display panel including a plurality of pixels;

a main circuit board electrically connected to the display panel; and

a driving circuit disposed on the main circuit board and providing an output image signal to the display panel,

wherein the driving circuit includes:

a temperature sensor which detects an ambient temperature and outputs a first temperature signal corresponding to the detected ambient temperature;

a temperature calculator which calculates the ambient temperature using current flowing through a transistor included in the temperature calculator and outputs a second temperature signal corresponding to the calculated ambient temperature;

a memory which receives a memory power supply voltage and stores a compensation signal according to characteristics of the plurality of pixels;

a driving controller which receives the first temperature signal from the temperature sensor, the second temperature signal from the temperature calculator, and an input image signal, and outputs the output image signal to the display panel which is obtained by compensating for the input image signal based on the compensation signal from the memory; and

a voltage generator which generates the memory power supply voltage in response to a voltage control signal from the driving controller,

wherein the driving controller outputs the voltage control signal based on a temperature signal which indicates a lower temperature among the first temperature signal and the second temperature signal such that the memory power supply voltage has a first voltage level or a second voltage level,

wherein the memory power supply voltage remains constant at the first voltage level such that a voltage level of the compensation signal output from the memory is within a normal range when the temperature signal is lower than or equal to a reference temperature, and

wherein the memory power supply voltage remains constant at the second voltage level lower than the first voltage level when the temperature signal is higher than the reference temperature.

4 . The display device of claim 3 ,

wherein the pixel includes:

a light emitting element including a first terminal and a second terminal; and a transistor connected between a first voltage line and the first terminal of the light emitting element, and

wherein the compensation signal includes deterioration information of the transistor and the light emitting element.

5 . The display device of claim 4 , wherein the voltage generator further generates a first driving voltage provided to the first voltage line and a second driving voltage provided to the second terminal of the light emitting element.

6 . An operating method of a display device, the method comprising:

detecting a first ambient temperature and generating a first temperature signal corresponding to the detected ambient temperature;

calculating a second ambient temperature using current flowing through a transistor and generating a second temperature signal;

comparing a temperature signal which indicates a lower temperature from among the first temperature signal and the second temperature signal with a reference temperature;

generating a memory power supply voltage having a voltage level corresponding to the comparison result between the temperature signal and the reference temperature, wherein the memory power supply voltage remains constant at a first voltage level higher than a second voltage level such that a voltage level of the compensation signal output from a memory is within a normal range when the temperature signal is lower than or equal to the reference temperature;

providing the memory power supply voltage to the memory;

generating a compensation signal based on compensation information from the memory; and

providing a display panel with an output image signal obtained by compensating for an input image signal based on the compensation signal,

wherein the display panel includes a plurality of pixels, and

wherein the memory stores the compensation information according to characteristics of the plurality of pixels.

7 . The method of claim 6 , wherein the generating of the memory power supply voltage includes:

when the temperature signal is higher than the reference temperature, outputting a voltage control signal of a first level; and

outputting a first memory power supply voltage in response to the voltage control signal of the first level.

8 . The method of claim 7 , further comprising:

when the temperature signal is lower than or equal to the reference temperature, outputting the voltage control signal of a second level; and

outputting the first memory power supply voltage of the first voltage level higher than the second voltage level in response to the voltage control signal of the second level.

9 . The method of claim 6 , wherein the pixel includes:

a light emitting element including a first terminal and a second terminal; and

a transistor connected between a first voltage line and the first terminal of the light emitting element, and

wherein the compensation information includes deterioration information of the transistor and the light emitting element.