Camera monitor system for responding to amount of light

1. A camera monitor system for responding to an amount of light, comprising:

a sensor unit configured to measure an amount of external light outside of a vehicle;

a camera unit configured to capture an image of an outside of the vehicle;

a display unit comprising a first display layer configured to display the image of the outside, captured by the camera unit, and a second display layer configured to display at least one icon and at least partially overlapping the first display layer; and

a controller configured to set a luminance of the first display layer in response to the amount of external light received from the sensor unit and to change transparency of the at least one icon of the second display layer.

2. The camera monitor system of claim 1 , wherein, when the amount of external light measured by the sensor unit is equal to or greater than a first reference value, the controller sets a daytime mode, and when the amount of the external light is less than the first reference value, the controller sets a nighttime mode.

3. The camera monitor system of claim 1 , wherein the controller comprises:

a micro control unit configured to receive data of the amount of external light from the sensor unit and to control the luminance of the first display layer; and

an image processor configured to receive the data of the amount of external light from the micro control unit and to set the transparency of the second display layer accordingly.

4. The camera monitor system of claim 1 , wherein, when the luminance is controlled in response to the amount of external light measured by the sensor unit, the controller is configured to control the transparency of the at least one icon of the second display in response to the luminance.

5. The camera monitor system of claim 1 , wherein the controller is configured to determine importance of the at least one icon and to control chromaticity of the at least one icon having relatively high importance.

6. The camera monitor system of claim 5 , wherein the controller is configured to simultaneously control chromaticity and transparency of the at least one icon depending on the importance of the at least one icon.

7. The camera monitor system of claim 1 , wherein the controller stores a luminance value of the first display layer in response to the amount of external light.

8. The camera monitor system of claim 7 , wherein the controller stores the transparency of the at least one icon of the second display layer in response to a luminance value determined based on the amount of external light measured by the sensor unit.

9. The camera monitor system of claim 1 , wherein the at least one icon is positioned on the second display layer and comprises at least one of blind spot detection (BSD) icon, a rear guide line icon, a side guide line icon, or a door opening icon.

10. The camera monitor system of claim 1 , wherein:

the first display layer comprises a backlight; and

the controller is configured to control the luminance of the first display layer by controlling brightness of the backlight.

11. The camera monitor system of claim 1 , wherein the controller is configured to measure a position of a light source, input through the sensor unit, and to simultaneously or individually control the first display layer and the second display layer, which are respectively positioned at left and right sides of the display, depending on the measured position.

12. The camera monitor system of claim 1 , wherein the controller is configured to have a maximum icon transparency of less than 50%.