Multiple light source color balancing system within a liquid crystal flat panel display

A color balancing system within a flat panel display for providing color balancing within a color temperature range, said color balancing system comprising:

• a first light pipe disposed to provide backlight to a liquid crystal display (LCD) layer;
• a first light source optically coupled to provide light to said first light pipe, said first light source having a color temperature that is below the minimum color temperature of said color temperature range;
• a second light pipe disposed parallel to said first light pipe such that an air gap exists between said first and said second light pipes, said second light pipe also for providing backlight to said LCD layer;
• a second light source optically coupled to provide light to said second light pipe, said second light source having a color temperature that is above the maximum color temperature of said color temperature range;
• and
• a circuit coupled to said first and said second light sources for setting a color temperature of said flat panel display by selectively and independently varying the brightness of said first light source and the brightness of said second light source.

A color balancing system within a flat panel display for providing color balancing within a color temperature range, said color balancing system comprising:

• a first light pipe disposed to provide backlight to a liquid crystal display (LCD) layer;
• first and second light sources optically coupled to provide light to said first light pipe, said first and said second light sources having a same color temperature that is above the maximum color temperature of said color temperature range;
• a second light pipe disposed parallel to said first light pipe such that an air gap exists between said first and said second light pipes, said second light pipe also for providing backlight to said LCD layer;
• a third light source optically coupled to provide light to said second light pipe, said third light source having a color temperature that is below the minimum color temperature of said color temperature range;
• and
• a circuit coupled to said third light source for setting a color temperature of said flat panel display by selectively varying the brightness of said third light source while illuminating said first and second light sources with constant brightness.

A color balancing system within a flat panel display for providing color balancing within a color temperature range, said color balancing system comprising:

• a first light pipe disposed to provide backlight to a liquid crystal display (LCD) layer;
• first and second light sources optically coupled to provide light to said first light pipe, said first and said second light sources having a same color temperature that is above the maximum color temperature of said color temperature range;
• a second light pipe disposed parallel to said first light pipe such that an air gap exists between said first and said second light pipes, said second light pipe also for providing backlight to said LCD layer;
• third and fourth light sources optically coupled to provide light to said second light pipe, said third and said fourth light sources having a same color temperature that is below the minimum color temperature of said color temperature range;
• and
• a circuit coupled to said first, second, third and fourth light sources for setting a color temperature of said flat panel display by selectively varying the brightness of first and second light sources and selectively varying the brightness of said third and fourth light sources independently of said first and second light sources.

A color balancing system within a flat panel display for providing color balancing within a color temperature range, said color balancing system comprising:

• a first light pipe disposed to provide backlight to a liquid crystal display (LCD) layer;
• first and second light sources optically coupled to provide light to said first light pipe, said first and said second light sources having a same color temperature that is above the maximum color temperature of said color temperature range;
• third and fourth light sources optically coupled to provide light to said first light pipe, said third and said fourth light sources having a same color temperature that is below the minimum color temperature of said color temperature range;
• and
• a circuit coupled to said first, second, third and fourth light sources for setting a color temperature of said flat panel display by selectively varying the brightness of first and second light sources and selectively varying the brightness of said third and fourth light sources independently of said first and second light sources.