Method and apparatus for ambient light sensor with spectral resolution
By introducing a multilayer doped structure into a photodiode to form multiple diodes, the problems of large space occupation and high cost of photodiodes and filters in the prior art are solved, and spectral resolution detection of compact photodiodes is realized.
CN122396906APending Publication Date: 2026-07-14QUALCOMM INC
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- QUALCOMM INC
- Filing Date
- 2024-12-17
- Publication Date
- 2026-07-14
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Figure CN122396906A_ABST
Abstract
Methods and apparatuses for ambient light sensors with spectral resolution are disclosed. In one aspect, an ambient light sensor includes a photodiode having a light-facing surface that includes a first n-doped layer, a first p-doped layer disposed below and in contact with the first n-doped layer, a second n-doped layer disposed below and in contact with the first p-doped layer, and a second p-doped layer disposed below and in contact with the second n-doped layer. A junction between the first n-doped layer and the first p-doped layer forms a first vertical diode; a junction between the first p-doped layer and the second n-doped layer forms a second vertical diode; and a junction between the second n-doped layer and the second p-doped layer forms a third vertical diode and a first lateral diode. Each of the diodes is most sensitive to a different range of wavelengths of light than the other diodes.
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