Image display system and method of driving the same
An image display system includes a camera part and an image display part. The image display part includes a user analyzer, a gamma corrector, a gamma voltage generator, and a display panel. The camera part takes a picture of a user and generates a user image signal. The user analyzer calculates the user's viewing direction based on the user image signal. The gamma corrector generates a correction gamma value based on the viewing direction. The gamma voltage generator generates a gamma voltage based on the correction gamma value, and the display panel displays an image corresponding to the gamma voltage. Accordingly, the image display system provides the image having an optimized gamma curve to the user in real time even without a separate input from the user.
1. An image display system comprising:
a camera part configured to take a picture of a user and configured to generate a user image signal;
a user analyzer configured to receive the user image signal and configured to calculate a viewing direction of the user based on the user image signal;
a gamma corrector configured to generate a correction gamma value based on the viewing direction;
a gamma voltage generator configured to generate a gamma voltage based on the correction gamma value; and
a display panel configured to display an image corresponding to the gamma voltage,
wherein the image has a first luminance value when the viewing direction is a first viewing direction looking up at the display panel, the image has a second luminance value greater than the first luminance value when the viewing direction is a second viewing direction looking down at the display panel,
wherein the gamma corrector is configured to generate a first gamma value when the viewing direction is the first viewing direction and to generate a second gamma value greater than the first gamma value when the viewing direction is the second viewing direction.
2. The image display system of claim 1 , wherein the user analyzer comprises:
a facial recognizer configured to receive the user image signal and configured to recognize a face of the user; and
a viewing direction calculator configured to calculate the viewing direction of the user based on a position of the face.
3. The image display system of claim 1 , further comprising a look-up table configured to store a gamma value corresponding to the viewing direction.
4. The image display system of claim 1 , further comprising:
a light source configured to provide light to the display panel; and
a light source controller configured to control a brightness of the light source based on the viewing direction.
5. A method of driving an image display system, the method comprising:
taking a picture of a user and generating a user image signal;
calculating a viewing direction of the user based on the user image signal;
generating a correction gamma value based on the viewing direction;
generating a gamma voltage based on the correction gamma value; and
displaying an image corresponding to the gamma voltage on a display panel,
wherein the image has a first luminance value when the viewing direction is a first viewing direction looking up at the display panel, the image has a second luminance value greater than the first luminance value when the viewing direction is a second viewing direction looking down at the display panel,
wherein a first gamma value is generated when the viewing direction is the first viewing direction and a second gamma value greater than the first gamma value is generated when the viewing direction is the second viewing direction.