Display device and method of driving the same
Provided is a display device including a display panel including subpixels connected to a low voltage line configured to deliver a low voltage and a data line configured to deliver a data voltage, a sensing switch configured to electrically connect the low voltage line and the data line, and a data driver including a sensing circuit configured to sense the low voltage line through the data line to prepare a sensed value when the sensing switch operates.
1. A display device comprising:
a display panel including subpixels is connected to a low voltage line that delivers a low voltage and a data line that delivers a data voltage;
a sensing switch configured to electrically connect the low voltage line and the data line; and
a data driver comprising a sensing circuit, the sensing circuit configured to directly sense the low voltage line through the data line and prepare a sensed value when the sensing switch operates,
wherein the sensing switch comprises:
a sensing transistor in a non-active area of the display panel, the sensing transistor having a first electrode that is directly connected to the data line and a second electrode that is directly connected to the low voltage line, and the sensing transistor is independently controlled.
2. The display device according to claim 1 , wherein the sensing transistor further comprises a gate electrode that is connected to a dummy gate line.
3. The display device according to claim 2 , wherein the sensing switch comprises:
a plurality of sensing transistors that are turned on sequentially, in reverse order, or randomly.
4. The display device according to claim 1 , wherein the sensing switch comprises:
a plurality of sensing transistors,
wherein the sensing switch turns on a sensing transistor from the plurality of sensing transistors that is connected to a subpixel among the subpixels in a non-operating state and senses a voltage or current applied through a subpixel in an operating state among the subpixels.
5. The display device according to claim 1 , further comprising:
a timing controller configured to control the data driver, the timing controller configured to compensate for a change in a low voltage according to an influence of current resistance (IR) for each position of the subpixels based on the sensed value.
6. The display device according to claim 1 , wherein the sensing switch comprises a plurality of sensing transistors; and
responsive to two subpixels positioned horizontally adjacent to each other in the display panel are connected to one low voltage line, one of two sensing transistors that is connected to the two subpixels is turned on, and the other of the two sensing transistors is turned off.
7. The display device according to claim 1 , wherein the sensing circuit is configured to sense a rise of a low voltage for each color of the subpixels responsive to an operation of the sensing switch and prepares a sensed value for each color.
8. A method of driving a display device comprising a display panel having a sensing switch that electrically connects a low voltage line that delivers a low voltage and a data line that delivers a data voltage, the method comprising:
driving the display panel;
operating the sensing switch and directly sensing the low voltage line through the data line;
deriving a compensation parameter based on a sensed value prepared through sensing of the low voltage line; and
compensating for a change in the low voltage according to an influence of current resistance (IR) for each position of subpixels included in the display panel based on the compensation parameter,
wherein the sensing switch comprises:
a sensing transistor in a non-active area of the display panel, the sensing transistor having a first electrode that is directly connected to the data line and a second electrode that is directly connected to the low voltage line, and the sensing transistor is independently controlled.
9. The method according to claim 8 , wherein the low voltage line is sensed for a period and an amount of use of the display panel; and the compensation parameter is updated in response to sensing of the low voltage line.