Light sensor
AssigneeSTMicroelectronics (Grenoble 2) SAS
InventorSalim BOUCHENE
Life of this patent
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Abstract
The present disclosure relates to a light sensor comprising: an optical device comprising a first face configured to receive light and a second face, the device being configured, when the first face receives the light at a first wavelength between 1100 nm and 1600 nm, to convert the received light to the light at a second wavelength between 600 nm and 1000 nm, and to emit the light at the second wavelength through the second face; and at least one pixel having a silicon photoconversion area arranged opposite the second face of the optical device.
Claims20
A device, comprising:
- a carrier;
- an optical device including a first face configured to receive light at a first wavelength between 1100 nm and 1600 nm, and a second face opposite to the first face, the optical device configured to convert the light at the first wavelength to a converted light at a second wavelength between 600 nm and 1000 nm, and the optical device configured to emit the converted light at the second wavelength from the second face;
- a first integrated circuit chip on the carrier, the first integrated circuit chip including at least one pixel with a silicon photoconversion area aligned with and overlapped by the optical device;
- a laser source on the carrier, the laser source configured to emit the light at the first wavelength;
- and
- a protective housing encasing the carrier, the optical device, the first integrated circuit chip, and the laser source, the protective housing including a first partition on the carrier between the laser source and the first integrated circuit chip, the first partition optically isolating the laser source from the first integrated circuit chip, and the first partition being spaced from the optical device, the first integrated circuit chip, and the laser source.
A method, comprising:
- receiving, at a first face of an optical device overlapping a first chip, a light at a first wavelength between 1100 nm and 1600 nm;
- converting, with the optical device, the light at the first wavelength to a light at a second wavelength between 600 nm and 1000 nm and emitting the light at the second wavelength through a second face of the optical device opposite to the first face of the optical device;
- receiving, by at least one pixel of the first chip with a silicon photoconversion area aligned with and overlapped by the second face, the light at the second wavelength;
- receiving, at a second chip, an ambient light.
An electronic system, comprising:
- a display screen;
- a housing coupled to the display screen;
- a cavity at least partially delimited by the display screen and the housing;
- a sensor in the cavity, the sensor including:
- a protective housing including a first partition, a first aperture, and a second aperture;
- a first die in the housing spaced from the first partition, the first die is aligned with and overlapped by the first aperture;
- a light emitter in the housing spaced from the first partition and optically isolated from the first die within the housing by the first partition, the light source is aligned with and overlapped by the second aperture;
- and
- an optical device coupled to the protective housing, the optical device is aligned with and overlaps the first die and the first aperture, the optical device is configured to receive a first light with a first wavelength and emit a second light with a second wavelength different from the first wavelength.
Dependencies are inferred from the claim text.