Correlated color temperature detector

A color temperature measuring device for measuring the color temperature of viewing light, said device comprising:

• a sensor for individually sensing plural color components of viewing light incident thereon and for providing corresponding plural color signals representative of the light, said viewing light including ambient light and light output from an artificial light source;
• an A/D converting means for converting plural color signals from said sensor to plural digital color component signals;
• a programmable memory for storing correction data for correcting sensor errors in sensing the plural color components of light;
• a digital I/O interface;
• and
• a processor for receiving the plural digital color component signals from said A/D converting means, for accessing the correction data in said memory and for correcting the plural digital color component signals, for deriving a digital color temperature signal from said corrected plural digital color component signals, and for outputting the digital color temperature signal on said interface,
• wherein said processor is responsive to a command on the digital I/O interface for changing to a calibration mode, and when in said calibration mode, said processor is responsive to a command for receiving correction data and, in response to the command, stores the correction data into the programmable memory.

A color temperature measuring device for measuring the color temperature of viewing light, said device comprising:

• a substrate;
• a sensor embedded to said substrate, said sensor for individually sensing plural color components of viewing light incident on said sensor and for providing plural corresponding digital color component signals representative of the color content of the viewing light, said viewing light including ambient light and light output from an artificial light source;
• a memory fixed to said substrate, said memory for storing correction data for correcting the plural digital color component signals;
• a processor fixed to said substrate and including a digital interface, said processor for executing process steps to receive the plural digital color component signals from said sensor, to access the correction data in said memory, to correct the plural digital color component signals based on the correction data, to derive a color temperature signal from the corrected digital color component signals, to receive a request for providing a color temperature signal, and to output the digital color temperature signal on the digital interface in response to the request;
• and
• a digital I/O interface for interfacing with said processor,
• wherein said processor is responsive to a command on the digital I/O interface for changing to a calibration mode, and when in said calibration mode, said processor is responsive to a command for receiving correction data and, in response to the command, stores the correction data into the programmable memory.