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US 8,508,146 B2Granted
Electronic device, control circuit, and method for controlling light emitting element
AssigneeFujitsu Semiconductor Limited
InventorsTakeshi Hirano, Tomokazu Yamada
Life of this patent
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Abstract
An electronic device including a light emitting element. A capacitor is coupled to the light emitting element. A measurement circuit measures a change amount in charge of the capacitor. A control circuit controls a light emission amount of the light emitting element in accordance with a difference of the change amount in the charge and a reference value.
Claims10
An electronic device comprising:
- a light emitting element;
- a capacitor coupled to the light emitting element;
- a measurement circuit that measures a change amount in charge of the capacitor;
- and
- a control circuit that controls a light emission amount of the light emitting element in accordance with a difference between the change amount in the charge and a reference value.
2 more elements
A control circuit comprising:
- a measurement circuit that measures a change amount in charge during a certain period;
- and
- a comparison circuit that compares the change amount in the charge measured by the measurement circuit with a reference value.
A method for controlling a light emitting element, the method comprising:
- measuring a change amount in charge of a capacitor coupled to the light emitting element;
- and
- controlling a light emission amount of the light emitting element in accordance with a difference between the measured change amount in the charge and a reference value.
Dependencies are inferred from the claim text.