Display device and driving method thereof
View Patent ↗A display device according to an exemplary embodiment of the present inventive concept includes: pixels; scan lines extending in a row direction and connected to the pixels; a data lines extending in a column direction and connected to the pixels; a receiving lines extending in the column direction and connected to the pixels; and a compensation circuit portion that generates first sensing data by receiving a current flowing to the pixels through the receiving lines, and generates a compensation value that compensates a characteristic of a driving transistor included in each of the pixels by multiplying the first sensing data by a calibration factor that corresponds to a position of each of the pixels, wherein the calibration factor includes a line calibration factors that correspond to the receiving lines.
1. A display device comprising:
a plurality of pixels;
a plurality of scan lines extending in a row direction and connected to the plurality of pixels;
a plurality of data lines extending in a column direction and connected to the plurality of pixels;
a plurality of receiving lines extending in the column direction and connected to the plurality of pixels; and
a compensation circuit portion connected to the plurality of receiving lines,
wherein the compensation circuit portion includes:
a plurality of sensing data generating circuits each of which generates a first sensing data by sensing current flowing through a receiving line,
a calibration factor generator receiving the first sensing data and generating a calibration factor corresponds to a position of each of the plurality of pixels, and
a calibration operation portion receiving the first sensing data and generating a compensation value compensating a characteristic of a driving transistor included in each of the plurality of pixels,
wherein the calibration factor comprises a plurality of line calibration factors corresponding to the plurality of receiving lines, and
wherein any one of the plurality of line calibration factors comprises a ratio of average second sensing data to average first sensing data with respect to the receiving line.
2. The display device of claim 1 , wherein the average first sensing data comprises a value of averaging first sensing data corresponding to a factor detection area corresponding to some area in a display portion where the plurality of pixels are included for each of the receiving lines.
3. The display device of claim 2 , wherein the average second sensing data comprises a value of averaging second sensing data corresponding to the factor detection area for each of the receiving lines.
4. The display device of claim 3 , wherein a sensing data generating circuit comprises:
an analog-digital converter; and
an operational amplifier,
wherein current flowing through the receiving line is converted to the first sensing data by the analog-digital converter and the current flowing through the receiving line is converted to the second sensing data by the operational amplifier and the analog-digital converter.
5. The display device of claim 3 , wherein the factor detection area comprises one or more scan lines among the plurality of scan lines and a plurality of pixels connected to the one or more scan lines included in the factor detection area.
6. The display device of claim 3 , wherein the factor detection area comprises a plurality of areas spaced apart from each other in the column direction.
7. The display device of claim 1 , wherein the compensation circuit portion comprises a lookup table including the plurality of line calibration factors corresponding to the plurality of receiving lines.
8. The display device of claim 1 , wherein the compensation circuit portion comprises a filter removing noise included in the calibration factor.
9. The display device of claim 8 , wherein the filter comprises a low-pass filter.
10. A display device comprising:
a sensing data generator including a plurality of sensing data generating circuits, a sensing data generating circuits is connected to a receiving line which is connected to a plurality of pixels, includes an analog-digital converter and an operational amplifier, receives current flowing through a plurality of receiving lines by way of a plurality of pixels connected to the plurality of receiving lines, converts the current to first sensing data by using the analog-digital converter, and converts the current to second sensing data by using the operational amplifier and the analog-digital converter;
a calibration factor generator connected to the plurality of sensing data generating circuits, generates average first sensing data by averaging the first sensing data for each receiving line, generates average second sensing data by averaging the second sensing data for each receiving line, and calculates a calibration factor which is a ratio of the average second sensing data to the average first sensing data for each receiving line; and
a calibration operation portion generating a compensation value compensating a characteristic of a driving transistor included in each of the plurality of pixels by multiplying the first sensing data by a calibration factor corresponding to a position of the plurality of pixels.
11. The display device of claim 10 , further comprising a filter connected between the calibration factor generator and the calibration operation portion and removes noise included in the calibration factor by using a low-pass filter.
12. A method for driving a display device, comprising:
receiving current flowing through a plurality of receiving lines by way of a plurality of pixels connected to the plurality of receiving lines;
converting the current to first sensing data by using a plurality of sensing data generating circuit each of which includes an analog-digital converter; and
generating a plurality of compensation values each of which compensates a characteristic of a driving transistor included in each of the plurality of pixels by multiplying the first sensing data by a calibration factor that corresponds to the each of the plurality of pixels,
wherein the calibration factor comprises a plurality of line calibration factors corresponding to the plurality of receiving lines, and
wherein any one of the plurality of line calibration factors comprises a ratio of average second sensing data to average first sensing data with respect to the receiving line.
13. The method for driving the display device of claim 12 , further comprising:
converting the current to second sensing data by an operational amplifier included in each of the plurality of sensing data generating circuit and the analog-digital converter;
generating the average first sensing data by averaging the first sensing data for each of the plurality of receiving lines;
generating the average second sensing data by averaging the second sensing data for each of the plurality of receiving lines; and
calculating the calibration factor which is a ratio of the average second sensing data to the average first sensing data.
14. The method for driving the display device of claim 13 , further comprising storing the plurality of line calibration factors that correspond to the plurality of receiving lines as a lookup table.
15. The method for driving the display device of claim 13 , further comprising removing noise included in the calibration factor by using a low-pass filter.
16. The method for driving the display device of claim 13 , wherein the average first sensing data is generated by averaging first sensing data that correspond to a factor detection area that corresponds to some area of a display device where the plurality of pixels are included for each receiving line.
17. The method for driving the display device of claim 16 , wherein the average second sensing data is generated by averaging second sensing data corresponding to the factor detection for each receiving line.
18. The method for driving the display device of claim 17 , wherein the factor detection area comprises one or more scan lines included the plurality of scan lines that are connected to the plurality of pixels and a plurality of pixels that are connected to the scan lines included in the factor detection area.
19. The method for driving the display device of claim 17 , wherein the factor detection area comprises a plurality of areas that are spaced apart from each other in a column direction.