Liquid crystal display and local dimming control method thereof

A local dimming control method of a liquid crystal display including a liquid crystal display panel selectively displaying a 2D image and a 3D image in response to a mode signal and a backlight unit including a plurality of light sources divided into a plurality of predetermined blocks that provide light to the liquid crystal display panel, the local dimming control method comprising:

• individually driving the plurality of predetermined blocks based on a dimming value of each block in an Nth frame;
• and
• when the mode signal is a 2D mode signal, calculating a pixel gain value in an (N+1)th frame based on the dimming value of each block in the Nth frame, and applying the pixel gain value to the (N+1)th frame, and
• when the mode signal is a 3D mode signal, calculating a pixel gain value in an (N+4)th frame based on a delayed dimming value of each block in the Nth frame, and applying the pixel gain value to the (N+4)th frame, wherein N is a positive integer.

A liquid crystal display comprising:

• a liquid crystal display panel configured to selectively display a 2D image and a 3D image in response to a mode signal;
• a backlight unit including a plurality of light sources divided into a plurality of predetermined blocks that light the liquid crystal display panel;
• a backlight driving circuit configured to individually drive the plurality of predetermined blocks based on a dimming value of each block in an Nth frame;
• and
• a local dimming control circuit configured to
• when the mode signal is a 2D mode signal, calculate a pixel gain value in an (N+X1)th frame based on the dimming value of each block in the Nth frame, and
• apply the pixel gain value to the (N+X1)th frame, and
• when the mode signal is a 3D mode signal, calculate a pixel gain value in an (N+X2)th frame based on the dimming value of each block in the Nth frame, and
• apply the pixel gain value to the (N+X2)th frame, wherein N is a positive integer and wherein X1 and X2 are different positive integers greater than 1.