System and method for calibrating backlight devices

A method for controlling the backlight of a liquid crystal display (LCD) having a front display surface, a plurality of LEDs placed within a backlight cavity, a LCD stack between the front display surface and the backlight cavity, a first light sensing device placed to measure the ambient light contacting the front display surface, a second light sensing device placed within the backlight cavity, a power source in electrical communication with the LEDs, and a software driver in electrical communication with the first light sensing device, second light sensing device, and power source, the method comprising:

• accepting the ambient light data from the first light sensing device;
• determining the desired display luminance based on the ambient light data;
• determining the desired backlight luminance based on the desired display luminance;
• and
• driving the LEDs to achieve the desired backlight luminance according to the light data from the second light sensing device.

A system for controlling the backlight luminance of a liquid crystal display (LCD) having a front display surface, a plurality of LEDs placed within a backlight cavity, and a LCD stack between the front display surface and the backlight cavity, the system comprising:

• a first light sensing device placed to measure the ambient light contacting the front display surface;
• a second light sensing device placed within the backlight cavity and positioned to measure at least the ambient light which is passing through the LCD stack and entering the backlight cavity;
• a translucent structure placed in front of the first light sensing device;
• a power source in electrical communication with the LEDs;
• and
• a microprocessor in electrical communication with the first light sensing device, second light sensing device, and power source and adapted to
• apply a correction factor to the data from the second light sensing device based on data from the first light sensing device and
• drive the power source according to corrected data from the first light sensing device.

A system for controlling the backlight luminance of a liquid crystal display (LCD) having a front display surface, a plurality of LEDs placed within a backlight cavity, and a LCD stack between the front display surface and the backlight cavity, the system comprising:

• a first light sensing device placed to measure the ambient light contacting the front display surface;
• a second light sensing device placed within the backlight cavity;
• a power source in electrical communication with the LEDs;
• and
• a microprocessor in electrical communication with the first light sensing device, second light sensing device, and power source and adapted to apply a correction factor to data from the second light sensing device based on the amount of ambient light passing through the LCD stack and entering the backlight cavity.