Control system for light-emitting device

A control system for a light-emitting device, the control system comprising:

• test circuitry configured to sequentially cause individual groups of light-emitting elements in a light-emitting device to emit light upon receiving an applied electric current during a test sequence, wherein each group of light-emitting elements includes one or more light-emitting elements;
• a plurality of photodetectors configured to detect an intensity of light present at a plurality of locations of the light-emitting device during the test sequence, wherein each of the plurality of photodetectors is configured to generate a detection signal corresponding to a detected intensity of light;
• and
• process circuitry configured to process the detection signals generated by the plurality of photodetectors and transmit an adjustment signal based on the processing, wherein the applied electric current is adjustable based on the adjustment signal such that at least one characteristic of light emitted by all of the plurality of light-emitting elements is substantially the same at each of the plurality of locations of the light-emitting device.

A method of driving a light-emitting device, the method comprising:

• performing a test sequence, wherein the test sequence comprises applying electric current to a plurality of groups of light-emitting elements in a light-emitting device to cause the plurality of groups of light-emitting elements to emit light sequentially, wherein each group of light-emitting elements includes one or more light-emitting elements;
• detecting an intensity of light present at a plurality of locations of the light-emitting device during the test sequence;
• generating a plurality of detection signals corresponding to a detected intensity of light at each of the plurality of locations of the light-emitting device;
• processing the detection signals and generating an adjustment signal based on the processing;
• and
• transmitting the adjustment signal to a driver configured to apply electric current to the plurality of light-emitting elements such that at least one characteristic of light emitted by all of the plurality of light-emitting elements is substantially the same at each of the plurality of locations of the light-emitting device.