Contrast adjusting circuitry and video display apparatus using same

A video display apparatus which displays video images based on inputted video signals, comprising:

• a detector which detects a luminance information in said video signals;
• a first controller which controls a luminance signal component of said video signals by using said luminance information detected by said detector;
• and
• a second controller which controls a color signal component in said video signals according to the control by said first controller.

A video display apparatus which displays video images based on inputted video signals, comprising:

• a detector which detects a luminance information in said video signals;
• a first controller which controls a luminance signal component in said video signals by using said luminance information detected by said detector;
• and
• a second controller which controls a color signal component in said video signals,
• wherein, said first controller and said second controller are controlled based on a specified correlation.

A video display apparatus which displays video images based on inputted video signals, comprising:

• a detector which detects a luminance information in said video signals;
• a first controller which controls a luminance signal component in said video signals by using said luminance information detected by said detector;
• and
• a second controller which controls a color signal component in said video signals according to the control by said first controller,
• wherein, in case said first controller controls so as to increase said luminance signal component in said video signals, said second controller controls so as to increase said color signal component in said video signals.

A video display apparatus which displays video images based on inputted video signals including color difference signals and luminance signals, comprising:

• a detector which detects luminance information in said luminance signals;
• a first controller which controls said luminance signals by using said luminance information detected by said detector;
• and
• a second controller which controls said color difference signals in said video signals,
• wherein, in case said first controller controls so as to increase the level of said luminance signals, said second controller controls color signals so as to increase the level of said color signals.

A video display apparatus which displays video images based on inputted video signals including color difference signals and luminance signals, comprising:

• a detector which detects luminance information in said luminance signals;
• a first amplifier which controls the gain of said luminance signals;
• a second amplifier which controls the gain of said color difference signals;
• and
• a controller which controls said first amplifier and said second amplifier by using said luminance information detected by said detector in a state that said first amplifier and said second amplifier are linked with each other.