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US 11,538,411 B2Granted
Display device and method for driving display device
AssigneeLG Display Co., Ltd.
InventorsMooKyoung Hong, KwangMo Park
Life of this patent
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Abstract
A display device and a method for driving the display device are discussed, which can save costs and implement high luminance by adopting a voltage sensing scheme for accurately sensing characteristic values of the light emitting device in the subpixel for compensation while also increasing the available display area.
Claims20
A display device, comprising:
- a display panel including a plurality of data lines, a plurality of gate lines, and a plurality of subpixels;
- a data driving circuit configured to drive the plurality of data lines;
- and
- a gate driving circuit configured to drive the plurality of gate lines,
- wherein each of the plurality of subpixels includes:
- a light emitting device;
- a driving transistor configured to drive the light emitting device;
- a switching transistor configured to receive a gate signal and control a connection between a first node of the driving transistor and a corresponding data line;
- a sensing transistor configured to receive the gate signal and control a connection between a second node of the driving transistor and a sensing line;
- and
- a storage capacitor electrically connected between the first node and the second node of the driving transistor,
- wherein the display device further comprises:
- a data line switch configured to switch an electrical connection between a digital-to-analog converter and the data line;
- a sensing driving switch configured to supply a sensing driving reference voltage to the second node;
- an analog-to-digital converter configured to sense a voltage of the sensing line;
- and
- a sampling switch configured to switch an electrical connection between the sensing line and the analog-to-digital converter,
- wherein when the data line switch is in a turn-on state, a sensing driving data voltage is applied to the first node of the driving transistor, and when the data line switch is in a turn-off state, a voltage of the first node of the driving transistor is varied,
- wherein when the sensing driving switch is in a turn-on state, the sensing driving reference voltage is applied to the second node of the driving transistor, and when the sensing driving switch is in a turn-off state, a voltage of the second node of the driving transistor is varied, and
- wherein in a period during which the data line switch and the sensing driving switch are in the turn-off state and the voltage of the first node of the driving transistor increases, the sampling switch is turned on and the analog-to-digital converter senses the voltage of the sensing line.
17 more elements
A method for driving a display device, the method comprising:
- controlling, by the display device, a data line switch to be in a turn-on state, the data line switch being connected between a digital-to-analog converter and a data line of a subpixel included in the display device;
- when the data line switch is in the turn-on state, applying a sensing driving data voltage to a gate of a driving transistor of the subpixel, the gate of the driving transistor being connected to a switching transistor controlled by a gate signal;
- controlling the data line switch to be in a turn-off state;
- when the data line switch is in the turn-off state, varying a voltage of the gate of the driving transistor;
- sensing a voltage of a sensing line of the subpixel by an analog-to-digital converter, in a period during which a sampling switch connected to the sensing line is in the turned on state, the data line switch and a sensing driving switch connected to the sensing line are both in the turn-off state and the voltage of the gate of the driving transistor increases,
- wherein a sensing transistor is connected between the sensing line and the driving transistor.
3 more elements
A display device, comprising:
- a display panel including a plurality of data lines, a plurality of gate lines, and a plurality of subpixels;
- a data driving circuit configured to drive the plurality of data lines;
- and
- a gate driving circuit configured to drive the plurality of gate lines,
- wherein at least one subpixel among the plurality of subpixels includes:
- a light emitting device;
- a driving transistor configured to drive the light emitting device;
- a switching transistor configured to receive a gate signal and control a connection between a first node of the driving transistor and a corresponding data line;
- a sensing transistor configured to receive the gate signal and control a connection between a second node of the driving transistor and a sensing line;
- and
- a storage capacitor electrically connected between the first node and the second node of the driving transistor,
- wherein when the corresponding data line is in a low impedance state, a sensing driving data voltage is applied to the first node of the driving transistor, and when the corresponding data line is in a high impedance state, the voltage of the first node of the driving transistor is varied,
- wherein when an impedance of the corresponding data line is a predefined threshold or more, the data line is in the high impedance state, and when the impedance of the corresponding data line is less than the threshold, the data line is in the low impedance state,
- wherein when a sensing driving reference voltage is supplied to the sensing line, the sensing driving reference voltage is applied to the second node of the driving transistor, and when the supply of the sensing driving reference voltage to the sensing line is cut off, the voltage of the second node of the driving transistor is varied, and
- wherein a period during which the corresponding data line is in the low impedance state includes the light emitting device emitting light, and a period during which the corresponding data line is in the high impedance state includes light emitting device in an off state that does not emit light.
12 more elements
Dependencies are inferred from the claim text.