Display device and method of driving a display device
AssigneesSamsung Display Co., Ltd., Unist (Ulsan National Institute of Science and Technology)
InventorsKyeongmin Park, Franklin Don Bien, Kyeonghan Shin, Seunghun Oh, Haewan Cho, Dongjin Choi
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Abstract
A display device includes a display panel including an active pixel and a reference pixel, a reference pixel measurer which applies a reference data voltage and a gate voltage to the reference pixel, calculates a first threshold voltage and a second threshold voltage based on a driving current of the reference pixel and calculates a difference between the first threshold voltage and the second threshold voltage, and a driving controller which controls the reference pixel measurer and outputs a data signal based on the difference.
Claims23
A display device comprising:
- a display panel including an active pixel and a reference pixel;
- a reference pixel measurer which applies a reference data voltage and a gate voltage to the reference pixel, calculates a first threshold voltage and a second threshold voltage based on a driving current of the reference pixel corresponding to the reference data voltage and calculates a difference between the first threshold voltage and the second threshold voltage;
- and
- a driving controller which controls the reference pixel measurer and outputs a data signal based on the difference between the first threshold voltage and the second threshold voltage,
- wherein the reference pixel comprises a reference driving transistor including a first control electrode which receives the reference data voltage, a second control electrode which receives the gate voltage, a first electrode which receive a first power voltage and a second electrode connected to a reference node, and
- wherein the active pixel comprises:
- an active driving transistor including a first control electrode connected to a first active node, a first electrode which receives the first power voltage and a second electrode connected to a second active node;
- an active scan transistor including a control electrode which receives a scan gate signal, a first electrode which receives a data voltage generated based on the data signal and a second electrode connected to the first active node;
- an active sensing transistor including a control electrode which receives a sensing gate signal, a first electrode connected to a sensing line and a second electrode connected to the second active node;
- and
- a light emitting element including an anode connected to the second active node and a cathode which receives a second power voltage.
A method of driving a display device, the method comprising:
- storing a first sensing threshold voltage outputted by applying a first sensing data voltage to a first control electrode of an active driving transistor included in an active pixel of a display panel of the display device;
- after the storing the first sensing threshold voltage, storing a second sensing threshold voltage outputted by applying a second sensing data voltage to the first control electrode of the active driving transistor;
- calculating an active threshold voltage based on the first sensing threshold voltage and the second sensing threshold voltage;
- and
- after the calculating the active threshold voltage, outputting a compensation voltage calculated by using the active threshold voltage and an error value, which is a difference between a first threshold voltage and a second threshold voltage obtained from a reference pixel of the display panel of the display device.
A display device comprising:
- a display panel;
- and
- a display panel driver which drives the display panel,
- wherein the display panel driver applies a compensation voltage to the display panel by using a sensing data and an error function,
- wherein the display panel emits light based on the compensation voltage, and
- wherein the error function is set based on first threshold voltages calculated by applying a second process to voltage-current curve functions obtained by using a first process and second threshold voltages calculated by applying a third process different from the second process to the voltage-current curve functions.
Dependencies are inferred from the claim text.