Image sensors with high dynamic range and infrared imaging toroidal pixels
An image sensor may include phase detecting and autofocusing (PDAF) pixels. Each pixel may include an inner photodiode region and outer photodiode regions to provide high dynamic range (HDR) capability. Each pixel may include an in infrared blocking filter that selectively covers the inner photodiode region or the outer photodiode regions. Two pixels of the same color but with different infrared blocking filter patterns may be compared to provide infrared sensing. Any color filter array configuration can be used. Instead of an infrared blocking filter, an infrared pass filter may also be used. A first pixel may include an infrared pass filter that selectively covers the inner photodiode region, whereas a second pixel may include an infrared pass filter that selectively covers the outer photodiode regions. The charge collected by the first and second pixels may be compared to provide infrared sensing.
1. An image sensor comprising:
a first pixel having an inner photodiode region and an outer photodiode region, wherein the outer photodiode region of the first pixel is covered by infrared filtering material; and
a second pixel having an inner photodiode region and an outer photodiode region, wherein the outer photodiode region of the second pixel is not covered by any infrared filtering material,
wherein the first pixel and the second pixel are covered by respective color filter materials for passing a same color,
and wherein charge collected by the first pixel is compared with charge collected by the second pixel to provide infrared sensing.
2. The image sensor of claim 1 , wherein the inner photodiode region of the first pixel is not covered by any infrared filtering material, and wherein the inner photodiode region of the second pixel is covered by the infrared filtering material.
3. The image sensor of claim 1 , wherein the infrared filtering material blocks infrared light.
4. The image sensor of claim 1 , wherein the infrared filtering material passes infrared light.
5. The image sensor of claim 4 , wherein the respective color filter materials covering the first and second pixels comprise a clear color filter formed over each of the first and second pixels.
6. The image sensor of claim 5 , wherein the inner photodiode region of the first pixel is not covered by any infrared filtering material, and wherein the inner photodiode region of the second pixel is covered by the infrared filtering material.
7. The image sensor of claim 1 , further comprising a third pixel having an inner photodiode region and an outer photodiode region, wherein the inner and outer photodiode regions of the third pixel are not covered by any infrared filtering material.
8. The image sensor of claim 1 , wherein the respective color filter materials are formed on a layer that is separate from a layer on which the infrared filtering material is formed.