Overcurrent determination circuit and light emission control apparatus
AssigneeSony Corporation
InventorToshiki Udagawa
Life of this patent
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Abstract
[Object] To provide a technology capable of appropriately determining whether overcurrent has flowed in a light emitting element even in a case where the light emitting element is driven by the pulse driving method. [Solving Means] An overcurrent determination circuit according to the present technology includes: a sample-and-hold circuit that obtains a driving current value of a light emitting element in accordance with a timing of a light emitting interval of the light emitting element that emits pulsed light; and a comparator circuit that compares the obtained driving current value with a value of a predetermined determination level and determines whether overcurrent has flowed in the light emitting element.
Claims13
A light emission control apparatus, comprising:
- a light emitting element configured to emit pulsed light, wherein the light emitting element comprises:
- a first light emitting element and a second light emitting element that are configured to output light in wavelength regions different from each other and emit light at timings different from each other;
- and
- an overcurrent determination circuit comprising:
- a first overcurrent determination circuit corresponding to the first light emitting element and a second overcurrent determination circuit corresponding to the second light emitting element,
- wherein each overcurrent determination circuit comprises:
- a sample-and-hold circuit configured to obtain a driving current value of the light emitting element in accordance with a timing of a light emitting interval of the light emitting element that emits the pulsed light, and
- a comparator circuit configured to compare the obtained driving current value with a value of a predetermined determination level and determine whether overcurrent has flowed in the light emitting element.
Dependencies are inferred from the claim text.