Display device with duty control function and duty control method thereof

A driving method of a display device which comprises a display panel on which a plurality of pixels connected to data lines, reference lines, and gate lines are arranged, wherein each of the pixels comprises an Organic Light Emitting Diode (OLED), a driving Thin Film Transistor (TFT) for controlling a driving current flowing in the OLED in accordance with a gate-source voltage, the method comprising:

• supplying a data voltage to the data lines and a reference voltage to the reference lines;
• generating a scan signal and a sensing signal and supplying the scan signal and the sensing signal to the gate lines, wherein the scan signal is to be synchronized with the data voltage and the sensing signal is to be synchronized with the reference voltage;
• dividing one frame into a programming time, an emission time, and a non-emission time to drive the display panel, and controlling an emission duty by variably controlling the programming time based on a result of analysis of input image data, wherein the programming time is a period of time in which the gate-source voltage is set for the driving current, the emission time is a period of time in which the OLED emits light in accordance with the driving current, and the non-emission time is a period of time in which the OLED stops emitting light;
• and
• in a cinema view mode in which an empty area is displayed in upper and lower parts of the display panel, setting the gate-source voltage for areas, except for the empty area, for the driving current, so that the programming time is reduced,
• wherein, when the emission time is reduced as a result of controlling of the emission duty, the timing controller corrects data Vdata, which is input to a driving TFT of a corresponding OLED, into a corrected data V′data based on the following equation:
• V
• data
• ′
• =
• V
• data
• ×
• (
• Emission
• ⁢
• ⁢
• Time
• ⁢
• ⁢
• Ref
• .
• Emission
• ⁢
• ⁢
• Time
• )
• 2
• .
• [
• Equation
• ]

A display device comprising:

• a display panel on which a plurality of pixels connected to data lines, reference lines, and gate lines are arranged, wherein each of the pixels comprises an Organic Light Emitting Diode (OLED) and a driving Thin Film Transistor (TFT) for controlling a driving current flowing in the OLED in accordance with a gate-source voltage;
• a data drive circuit configured to supply a data voltage to the data lines and a reference voltage to the reference lines;
• a gate drive circuit configured to generate a scan signal and a sensing signal and supply the scan signal and the sensing signal to the gate lines, wherein the scan signal is to be synchronized with the data voltage and the sensing signal is to be synchronized with the reference voltage;
• and
• a timing controller configured to divide one frame into a programming time, an emission time, and a non-emission time to drive the display panel, and control an emission duty by variably controlling the programming time based on a result of analysis of input image data, wherein the programming time is a period of time in which the gate-source voltage is set for the driving current, the emission time is a period of time in which the OLED emits light in accordance with the driving current, and the non-emission time is a period of time in which the OLED stops emitting light,
• wherein, when the emission time is reduced as a result of controlling of the emission duty, the timing controller corrects data Vdata, which is input to a driving TFT of a corresponding OLED, into a corrected data V′data based on the following equation:
• V
• data
• ′
• =
• V
• data
• ×
• (
• Emission
• ⁢
• ⁢
• Time
• ⁢
• ⁢
• Ref
• .
• Emission
• ⁢
• ⁢
• Time
• )
• 2
• .
• [
• Equation
• ]