Light-emitting semiconductor device pulse drive method and pulse drive circuit
First Claim
1. A pulse drive method for one or more light-emitting semiconductor devices having a plurality of light-emitting elements emitting light at different wavelengths, the light-emitting semiconductor device pulse drive method comprising:
- first lit steps in which at least a portion of the light-emitting elements of any of the emitted wavelengths is or are made to light as a result of being driven at one or more drive settings for each emitted wavelength, at least one optical output from the lit light-emitting element or elements is detected, and at least one of the light-emitting element drive setting or settings is adjusted based on at least one of the detected light-emitting element optical output or outputs; and
unlit steps in which the light-emitting elements of all of the emitted wavelengths are unlit for prescribed unlit time;
wherein the first lit steps are carried out in repeated fashion while at least a portion of the driven light-emitting element or elements is or are switched so as to cause at least a portion of the light-emitting elements to sequentially light in pulsed fashion in turn by emitted wavelength; and
at least one iteration of the unlit steps respectively intervenes between each pair of successive iterations of the first lit steps carried out in repeated fashion.
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Abstract
A pulse drive method for a light-emitting semiconductor devices having a plurality of light-emitting elements emitting light at different wavelengths and comprising first lit steps in which light-emitting element(s) of any of the emitted wavelengths is/are made to light as a result of being driven at drive setting(s) for each emitted wavelength, optical output(s) from the lit light-emitting element(s) is/are detected, and the light-emitting element(s) drive setting(s) is/are adjusted based on the detected light-emitting element optical output(s); and unlit steps in which the light-emitting elements of all of the emitted wavelengths are unlit for prescribed unlit time. The first lit steps are carried out in repeated fashion while the driven light-emitting element(s) is/are switched so as to cause the light-emitting element(s) to sequentially light in pulsed fashion in turn by emitted wavelength, and the unlit step respectively intervenes between each pair of successive iterations of the first lit steps.
20 Citations
21 Claims
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1. A pulse drive method for one or more light-emitting semiconductor devices having a plurality of light-emitting elements emitting light at different wavelengths, the light-emitting semiconductor device pulse drive method comprising:
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first lit steps in which at least a portion of the light-emitting elements of any of the emitted wavelengths is or are made to light as a result of being driven at one or more drive settings for each emitted wavelength, at least one optical output from the lit light-emitting element or elements is detected, and at least one of the light-emitting element drive setting or settings is adjusted based on at least one of the detected light-emitting element optical output or outputs; and
unlit steps in which the light-emitting elements of all of the emitted wavelengths are unlit for prescribed unlit time;
wherein the first lit steps are carried out in repeated fashion while at least a portion of the driven light-emitting element or elements is or are switched so as to cause at least a portion of the light-emitting elements to sequentially light in pulsed fashion in turn by emitted wavelength; and
at least one iteration of the unlit steps respectively intervenes between each pair of successive iterations of the first lit steps carried out in repeated fashion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A pulse drive circuit for one or more light-emitting semiconductor devices having a plurality of light-emitting elements emitting light at different wavelengths, the light-emitting semiconductor device pulse drive circuit comprising:
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one or more drive circuits sequentially driving at least a portion of the light-emitting elements in pulsed fashion in turn by emitted wavelength at one or more drive currents set for each emitted wavelength;
one or more detection circuits detecting one or more optical outputs from at least a portion of the light-emitting elements; and
one or more setting circuits adjusting one or more drive current settings of at least a portion of the light-emitting elements for each emitted wavelength based on the results of detection carried out by at least one of the detection circuit or circuits;
wherein at least one of the drive circuit or circuits respectively carries out setting with respect to prescribed unlit time during which the light-emitting elements of all of the emitted wavelengths are unlit between lit times for each emitted wavelength of at least a portion of the light-emitting elements. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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Specification