Display device including a common voltage compensation circuit, and method for driving the same
A display panel includes left and right common voltage lines in opposite side edges, horizontal common voltage lines connecting the left and right common voltage lines, and vertical common voltage lines, a printed circuit board including one or more integrated circuits, and a common voltage compensation circuit supplies a common voltage to the left and right common voltage lines while supplying the common voltage through the integrated circuits to the vertical common voltage lines.
1. A display device, comprising:
a display panel including a left common voltage line and a right common voltage line formed along two opposite side edge areas, a plurality of horizontal common voltage lines connecting the left common voltage line and the right common voltage line and arranged in a display area, and a plurality of vertical common voltage lines arranged to cross the plurality of horizontal common voltage lines;
a printed circuit board having one or more integrated circuits formed thereon to supply a data voltage through a data line to the display panel; and
a common voltage compensation circuit supplying a common voltage to the left common voltage line and the right common voltage line while simultaneously supplying the common voltage through the one or more integrated circuits to the plurality of vertical common voltage lines,
wherein each of the plurality of vertical common voltage lines is formed on a gate layer or a source/drain layer.
2. The display device of claim 1 , wherein the left common voltage line and the right common voltage line are connected to a left feedback line and a right feedback line which are disposed outside a gate driving circuit supplying a gate driving voltage to the display area, respectively, to feed the common voltage back to the common voltage compensation circuit.
3. The display device of claim 2 , wherein the common voltage compensation circuit includes an operational amplifier receiving, via a first resistor and an inverting input terminal, the common voltage fed back from the display panel through the left feedback line or the right feedback line and a reference voltage via a non-inverting input terminal.
4. The display device of claim 2 , wherein the gate driving circuit is placed over each of both side edges of the display panel.
5. The display device of claim 1 , wherein the plurality of vertical common voltage lines include one or more signal lines connected from one of the one or more integrated circuits to the display panel.
6. The display device of claim 1 , wherein the plurality of vertical common voltage lines are merged from a plurality of ones of the one or more integrated circuits into one signal line connected to the display panel.
7. The display device of claim 1 , wherein each of the plurality of vertical common voltage lines is formed alternately on the gate layer and the source/drain layer.
8. The display device of claim 1 , wherein each of the plurality of vertical common voltage lines includes:
a first signal line extending from one of the one or more integrated circuits and formed on the gate layer;
a second signal line extending from the one of the one or more integrated circuits and formed on the source/drain layer in a direction parallel with the gate layer; and
a jumping wire connecting the first signal line and the second signal line and connected to the display panel.
9. The display device of claim 1 , further comprising an auxiliary horizontal common voltage line disposed in an edge area of the display panel opposite to the one or more integrated circuits, wherein
the auxiliary horizontal common voltage line is connected to the horizontal common voltage lines positioned in the display area, in one or more nodes.
10. The display device of claim 1 , wherein the plurality of horizontal common voltage lines and the plurality of vertical common voltage lines are electrically connected together at crossing points of the plurality of horizontal common voltage lines.
11. A method for driving a display device, the method comprising:
supplying a common voltage to a plurality of horizontal common voltage lines through a left common voltage line and a right common voltage line formed along two opposite side edge areas, the plurality of horizontal common voltage lines connected with the left common voltage line and the right common voltage line and arranged in a display area of a display panel;
supplying the common voltage to a plurality of vertical common voltage lines arranged to cross the plurality of horizontal common voltage lines;
receiving the common voltage fed back from the display panel, through a feedback line connected to the left common voltage line or the right common voltage line; and
compensating for the fed-back common voltage according to a predetermined compensation ratio and outputting the compensated fed-back common voltage,
wherein each of the plurality of vertical common voltage lines is formed on a gate layer or a source/drain layer.
12. The method of claim 11 , wherein the left common voltage line and the right common voltage line are connected to a left feedback line and a right feedback line which are disposed outside a gate driving circuit supplying a gate driving voltage to the display area, respectively, to feed the common voltage back to a common voltage compensation circuit.
13. The method of claim 12 , wherein the gate driving circuit is placed over each of both side edges of the display panel.
14. The method of claim 11 , wherein each of the plurality of vertical common voltage lines is formed alternately on the gate layer and the source/drain layer.
15. The method of claim 11 , wherein each of the plurality of vertical common voltage lines includes:
a first signal line formed on the gate layer;
a second signal line formed on the source/drain layer in a direction parallel with the gate layer; and
a jumping wire connecting the first signal line and the second signal line and connected to the display panel.
16. The method of claim 11 , further comprising an auxiliary horizontal common voltage line disposed in an opposite edge area of integrated circuits with respect to the display panel, wherein
the auxiliary horizontal common voltage line is connected to the plurality of horizontal common voltage lines positioned in the display area, in one or more nodes.
17. The method of claim 11 , wherein the plurality of horizontal common voltage lines and the plurality of vertical common voltage lines are electrically connected together at crossing points of the plurality of horizontal common voltage lines and the plurality of vertical common voltage lines.