Liquid crystal display device and controlling method thereof

A liquid crystal display device, comprising:

• a histogram analyzer analyzing a histogram of an input image and determining the input image as being in one of a low brightness mode, a normal mode, and a high brightness mode based on the histogram analysis;
• a back light controller controlling a maximum brightness of a back light unit based on the mode determination;
• and
• a data modulator enlarging the histogram of the input image to modulate data of the input image,
• wherein the histogram analyzer detects a most frequent value of gray scale occurring most frequently in the input image of one frame, compares the most frequent value with a predetermined low reference gray value and a predetermined high reference gray value, and determines the input image as being in one of the low brightness mode, the normal mode, and the high brightness mode based on the compared result.

A method of controlling a liquid crystal display device, comprising:

• analyzing a histogram of input image;
• determining the input image as being in one of a low brightness mode, a normal mode, and a high brightness mode based on the histogram analysis;
• and
• controlling a maximum brightness of a back light unit based on the mode determination,
• wherein the step of determining the input image as being in one the low brightness mode, the normal mode, and the high brightness mode based on the histogram analysis includes:
• detecting a most frequent value of gray scale occurring most frequently in the input image of one frame,
• comparing the most frequent value to a predetermined low reference gray value and a predetermined high reference gray value;
• and
• determining the input image as being in one of the low brightness mode, the normal mode, and the high brightness mode based on the compared result.

A method of controlling a liquid crystal display device, comprising:

• analyzing a histogram of an input image;
• determining the input image as being in one of a low brightness mode, a normal mode, and a high brightness mode based on the histogram analysis;
• controlling a maximum brightness of a back light unit based on the mode determination;
• and
• enlarging the histogram of the input image to modulate data of the input image,
• wherein the step of determining the input image as being in one the low brightness mode, the normal mode, and the high brightness mode based on the histogram analysis includes:
• detecting a most frequent value of gray scale occurring most frequently in the input image of one frame,
• comparing the most frequent value to a predetermined low reference gray value and a predetermined high reference gray value;
• and
• determining the input image as being in one of the low brightness mode, the normal mode, and the high brightness mode based on the compared result.