Light sensor including long-pass filter and light detection system
AssigneePanasonic Intellectual Property Management Co., Ltd.
InventorsSanshiro Shishido, Shinichi Machida, Takeyoshi Tokuhara, Katsuya Nozawa
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Abstract
A light sensor includes a photoelectric conversion layer and a long-pass filter that is disposed above the photoelectric conversion layer. The photoelectric conversion layer has a spectral sensitivity characteristic having a first peak at a first wavelength that is longer than a cut-on wavelength of the long-pass filter, and a spectral sensitivity of the photoelectric conversion layer at the cut-on wavelength is greater than or equal to 0% and less than or equal to 50% of a spectral sensitivity of the photoelectric conversion layer at the first wavelength.
Claims19
A light sensor comprising:
- a first electrode;
- a second electrode;
- a photoelectric conversion layer between the first electrode and the second electrode;
- and
- a long-pass filter that is disposed above the photoelectric conversion layer and that selectively transmits incident light having a wavelength longer than or equal to a cut-on wavelength of the long-pass filter, wherein
- the photoelectric conversion layer has a spectral sensitivity characteristic having a first peak at a first wavelength that is longer than the cut-on wavelength, and
- a spectral sensitivity of the photoelectric conversion layer at the cut-on wavelength is greater than or equal to 0% and less than or equal to 50% of a spectral sensitivity of the photoelectric conversion layer at the first wavelength.
A light detection system comprising:
- a light source that emits light toward a subject;
- and
- a light sensor that detects light from the subject,
- wherein the light sensor includes:
- a first electrode;
- a second electrode;
- a photoelectric conversion layer between the first electrode and the second electrode, and
- a long-pass filter that is disposed above the photoelectric conversion layer and that selectively transmits incident light having a wavelength longer than or equal to a cut-on wavelength of the long-pass filter, wherein
- the photoelectric conversion layer has a spectral sensitivity characteristic having a first peak at a first wavelength that is longer than the cut-on wavelength,
- a spectral sensitivity of the photoelectric conversion layer at the cut-on wavelength is greater than or equal to 0% and less than or equal to 50% of a spectral sensitivity of the photoelectric conversion layer at the first wavelength, and
- the light source emits light having the first wavelength.
Dependencies are inferred from the claim text.