Demura tuning for 2D backlight systems

A calibration system, comprising:

• a processor;
• and
• a storage device configured to store computer-executable instructions which when executed cause the processor to:
• acquire a plurality of brightness maps of a plurality of light sources of a two-dimensional backlight system for a plurality of test patterns, each test pattern indicating each of the plurality of light sources to be turned on or off, each of the plurality of light sources being turned on in only one of the plurality of test patterns,
• wherein the plurality of brightness maps indicate brightness levels of the plurality of light sources for the plurality of test patterns;
• produce a cumulative brightness map by adding together the brightness maps;
• and
• generate demura compensation factors for the plurality of light sources based on the cumulative brightness map,
• wherein the plurality of test patterns includes:
• a first test pattern in which a first set of light sources of the plurality of light sources are turned on and a first remaining set of light sources of the plurality of light sources are turned off, and
• a second test pattern in which a second set of light sources of the plurality of light sources are turned on and a second remaining set of light sources of the plurality of light sources are turned off, wherein the first and second sets of light sources share no light source.

A non-transitory tangible computer-readable storage medium that stores computer-executable instructions which when executed cause a processor to:

• acquire a plurality of brightness maps of a plurality of light sources of a two-dimensional backlight system for a plurality of test patterns, each test pattern indicating each of the plurality of light sources to be turned on or off, each of the plurality of light sources being turned on in only one of the plurality of test patterns, wherein the plurality of brightness maps indicate brightness levels of the plurality of light sources for the plurality of test patterns;
• produce a cumulative brightness map by adding together the brightness maps;
• and
• generate demura compensation factors for the plurality of light sources based on the cumulative brightness map,
• wherein the plurality of test patterns includes:
• a first test pattern in which a first set of light sources of the plurality of light sources are turned on and a first remaining set of light sources of the plurality of light sources are turned off, and
• a second test pattern in which a second set of light sources of the plurality of light sources are turned on and a second remaining set of light sources of the plurality of light sources are turned off, wherein the first and second sets of light sources share no light source.