Display device and driving method of the same
AssigneeLG Display Co., Ltd.
InventorsYongHo Jang, Younghyun Ko
Life of this patent
Estimating the term…
Abstract
The present specification provides a display device and a driving method thereof performing sampling for sensing a sampling voltage of a driving transistor using a fast mode in which a driving transistor operates by a sampling voltage formed in one storage capacitor, and data writing using the slow mode in which the driving transistor is operated by a data voltage formed in another storage capacitor.
Claims18
A display device comprising:
- an organic light-emitting diode including a first electrode;
- a driving transistor electrically coupled between the first electrode of the organic light emitting diode and a driving voltage line, the driving transistor including a second node, a first gate node, and a second gate node;
- a first transistor electrically coupled between the first gate node of the driving transistor and a data line;
- a second transistor electrically coupled to a sensing line;
- a first storage capacitor electrically coupled between the first gate node and the second node of the driving transistor;
- a third transistor electrically coupled between the driving voltage line and the driving transistor;
- a fourth transistor electrically coupled between the third transistor and the second gate node of the driving transistor, the fourth transistor including a second node;
- and
- a second storage capacitor electrically coupled between the second gate node and the second node of the driving transistor,
- wherein the first gate node is located either above or below a channel layer of the driving transistor,
- when the first gate node is located above the channel layer of the driving transistor, the second gate node is located below the channel layer of the driving transistor, and
- when the first gate node is located below the channel layer of the driving transistor, the second gate node is located above the channel layer of the driving transistor, and
- the second gate node is electrically coupled to the second node of the fourth transistor through a contact hole.
A driving method for driving a driving circuit including an organic light emitting diode, a driving transistor driving the organic light emitting diode and including a first gate electrode and a second gate electrode, a first storage capacitor electrically coupled between the organic light emitting diode, a specific node of the driving transistor and the first gate electrode, and a second storage capacitor electrically coupled between the specific node and the second gate electrode, the driving method comprising:
- storing a difference value between a reference voltage and an initialization voltage in the first storage capacitor;
- storing a difference value between a driving voltage and an initialization voltage in the second storage capacitor to initialize;
- performing sampling for sensing a sampling voltage using a fast mode in which the driving transistor operates by a sampling voltage stored in the second storage capacitor;
- performing data writing using a slow mode in which the driving transistor operates by a data voltage stored in the first storage capacitor;
- and
- emitting light from the organic light emitting diode by a driving current of the driving transistor.
A display device comprising:
- an organic light-emitting diode;
- a driving voltage line configured to supply a driving voltage;
- a data line configured to supply a data value;
- a sensing line configured to supply an initialization voltage;
- a driving transistor including a first gate node, a second gate node, a first electrode, and a second electrode, the driving transistor coupled between the organic light emitting diode and the driving voltage line;
- a first transistor coupled between the first gate node of the driving transistor and the data line;
- a second transistor coupled to the sensing line;
- a first storage capacitor coupled to the first gate node of the driving transistor;
- a third transistor coupled between the driving voltage line and the second electrode of the driving transistor;
- a fourth transistor coupled between the second electrode and the second gate node of the driving transistor;
- and
- a second storage capacitor coupled between the second gate node and the first electrode of the driving transistor,
- wherein the data value is a current or voltage value and first gate node is located either above or below a channel layer of the driving transistor,
- when the first gate node is located above the channel layer of the driving transistor, the second gate node is located below the channel layer of the driving transistor, and
- when the first gate node is located below the channel layer of the driving transistor, the second gate node is located above the channel layer of the driving transistor.
Dependencies are inferred from the claim text.