Display and control method thereof

A control method of a display including a liquid crystal display panel, a back light to illuminate the LCD panel, an inverter to supply electric power to the back light and adjust an intensity of illumination of the back light, the control method of the display comprising:

• sensing an environmental intensity of illumination;
• detecting a brightness distribution data of an inputted video signal;
• determining lightness of an image based on at least one of the sensed environmental intensity of illumination and the detected brightness distribution data of the inputted video signal when a user selects a function to adjust the intensity of illumination of the back light according to the at least one of the environmental intensity of illumination and the brightness distribution data of the inputted video signal;
• and
• controlling the inverter to adjust the intensity of the illumination of the back light according to the determined lightness.

A display apparatus for automatically adjusting an intensity of illumination of a back light, comprising:

• an inverter inverting direct current to alternating current to supply power to the back light;
• a sensor sensing an environmental intensity of illumination;
• a contrast intensifier intensifying a contrast of the inputted video signals;
• a brightness detector detecting brightness distribution data of the inputted video signals of intensified contrast;
• and
• a controller receiving the sensed environmental intensity of illumination or the detected brightness distribution data and outputting analog signals or pulse width modulation signals to the inverter to increase or decrease the intensity of illumination of the back light, wherein duty ratios of the pulse width modulation signals and voltages of the analog signals vary as the environmental intensity of illumination or the brightness distribution data.

A method of automatically adjusting an intensity of illumination of a back light on a display device, comprising:

• selecting a function to automatically adjust the intensity of illumination of the back light according to at least one of an environmental intensity of illumination and brightness distribution data of inputted video signals;
• sensing an environmental intensity of illumination to determine if the environmental intensity of illumination is low or high based on a predetermined value, and correspondingly decreasing the intensity of illumination of the back light if the environmental intensity of illumination is low and increasing the intensity of illumination of the back light if the environmental intensity of illumination is high;
• and
• detecting a brightness level of intensified contrast signals to determine if an image is dark or light based on brightness distribution data and correspondingly decreasing a contrast intensifying gain and decreasing an intensity of illumination of the back light if the image is dark and increasing the contrast intensifying gain and decreasing the intensity of illumination of back light if the image is light.