Liquid crystal display having common voltage compensator
An embodiment of the present invention provides a liquid crystal display including a liquid crystal panel having a display area and a non-display area; left and right common voltage lines connected to common voltage lines formed in the display area and located in the non-display area on the left and right sides of the display area; and a common voltage compensator that receives feedback common voltages from the left and right common voltage lines and outputs compensated common voltages based on the feedback common voltages, wherein the common voltage compensator divides the display area into a first display area and a second display area with respect to the center of the liquid crystal panel and performs different compensation to the first display area and the second display area.
1. A liquid crystal display comprising:
a liquid crystal panel comprising a display area and a non-display area;
left and right common voltage lines connected to common voltage lines formed in the display area and located in the non-display area on the left and right sides of the display area; and
a common voltage compensator that receives feedback common voltages from the left and right common voltage lines and outputs compensated common voltages based on the feedback common voltages,
wherein the common voltage compensator divides the display area into a first display area and a second display area with respect to the center of the liquid crystal panel and performs different compensation to the first display area and the second display area,
wherein the left and right common voltage lines formed in the non-display area on the left and right sides of the first display area are wider than the left and right common voltage lines formed in the non-display area on the left and right sides of the second display area, and
wherein the left and right common voltage lines formed in the non-display area on the left and right sides of the second display area comprise dummy common voltage lines which are physically separated from the left and right common voltage lines in the non-display area on the left and right sides of the second display area.
2. The liquid crystal display of claim 1 , wherein the common voltage lines located in the non-display area on the left and right sides of the display area are electrically connected by a unilateral common voltage line located in the non-display area on one side of the display area.
3. The liquid crystal display of claim 1 , wherein the common voltage compensator comprises first to fourth common voltage compensators,
the first common voltage compensator receiving a first feedback common voltage from the unilateral common voltage line formed in the non-display area on the left side of the first display area and supplying a first compensated common voltage to the unilateral common voltage line formed in the non-display area on the left side of the first display area,
the second common voltage compensator receiving a second feedback common voltage from the left dummy common voltage line formed in the non-display area on the left side of the second display area and supplying a second compensated common voltage to the left common voltage line formed in the non-display area on the left side of the second display area,
the third common voltage compensator receiving a third feedback common voltage from the unilateral common voltage line formed in the non-display area on the right side of the first display area and supplying a third compensated common voltage to the unilateral common voltage line formed in the non-display area on the right side of the first display area, and
the fourth common voltage compensator receiving a fourth feedback common voltage from the right dummy common voltage line formed in the non-display area on the right side of the second display area and supplying a fourth compensated common voltage to the right common voltage line formed in the non-display area on the right side of the second display area.
4. The liquid crystal display of claim 1 , wherein the common voltage compensator comprises:
first to fourth common voltage compensators each comprising resistors and an OP amplifier;
a first dummy resistor for electrically connecting an output terminal of the first common voltage compensator and an output terminal of the second common voltage compensator; and
a second dummy resistor for electrically connecting an output terminal of the third common voltage compensator and an output terminal of the fourth common voltage compensator.
5. The liquid crystal display of claim 4 , wherein the first to fourth common voltage compensators receive feedback common voltages through common voltage feedback lines, and supply compensated common voltages through common voltage compensation lines, and
the first and third common voltage feedback lines and the first and third common voltage compensation lines are wired to pass through source printed circuit boards each having a data driver mounted thereon, gate printed circuit boards each having a gate driver mounted thereon, and the non-display area on the left and right sides of the liquid crystal panel.