Image sensor including phase detection pixels and image pickup device
An image sensor includes a pixel array that includes a first pixel group and a second pixel group, each including a plurality of image pixels to generate image data. The first pixel group includes a first phase detection pixel pair including first phase detection pixels arranged adjacent to each other in a first direction and having at least one first microlens thereon, and the second pixel group includes a second phase detection pixel pair including second phase detection pixels arranged adjacent to each other in a second direction different from the first direction and having at least one second microlens thereon. The sensitivity of the first phase detection pixels is different from the sensitivity of the second phase detection pixels.
1. An image sensor comprising:
a pixel array comprising a plurality of shared pixels, wherein the plurality of shared pixels comprise:
a first shared phase detection pixel including first phase detection subpixels arranged adjacent to each other in a first direction, the first phase detection subpixels having a first single microlens thereon, and the first shared phase detection pixel further comprising first image sensing subpixels each having a respective first microlens thereon; and
a second shared phase detection pixel including second phase detection subpixels arranged adjacent to each other in a second direction different from the first direction, the second phase detection subpixels having a second single microlens thereon, and the second shared phase detection pixel further comprising second image sensing subpixels each having a respective second microlens thereon,
wherein a first sensitivity of the first phase detection subpixels is different from a second sensitivity of the second phase detection subpixels,
wherein each of the first phase detection subpixels includes a white color filter or no color filter.
2. The image sensor of claim 1 , wherein the first direction and the second direction are orthogonal to each other.
3. The image sensor of claim 1 , wherein the second phase detection subpixels do not include a color filter.
4. The image sensor of claim 1 , wherein the second shared phase detection pixel is arranged adjacent to the first shared phase detection pixel in the second direction, and the first direction is a horizontal direction and the second direction is a vertical direction.
5. The image sensor of claim 1 , further comprising a timing controller configured to differently control a light exposure time for the first phase detection subpixels and a light exposure time for the second phase detection subpixels to generate first and second phase information for calculating a phase difference between respective images.
6. The image sensor of claim 1 , wherein the white color filter is a first white color filter,
wherein each of the second phase detection subpixels includes a second white color filter.
7. The image sensor of claim 1 , wherein the plurality of shared pixels further comprise:
a plurality of shared image sensing pixels, each of the shared image sensing pixels including a plurality of image sensing subpixels each including a respective identical color filter, wherein ones of the image sensing subpixels included in a same shared image sensing pixel are connected to a same selection signal line.
8. The image sensor of claim 1 , wherein the second phase detection subpixels included in the second shared phase detection pixel comprise a color filter.
9. The image sensor of claim 1 , further comprising:
a processor configured to perform a computation of a sensitivity-based phase difference by using first phase information received from the first phase detection subpixels and/or second phase information received from the second phase detection subpixels, and to control a lens driver based on a result of the computation.
10. The image sensor of claim 9 , wherein the processor is further configured to generate a first phase difference value and a first confidence level of the first phase difference value by using the first phase information, and compute a second phase difference value by using the second phase information based on the first confidence level of the first phase difference value.
11. The image sensor of claim 10 , wherein the processor is further configured to control the lens driver by using the first phase difference value when the first confidence level of the first phase difference value is equal to or greater than a threshold value, and generate the second phase difference value and a second confidence level of the second phase difference value when the first confidence level of the first phase difference value is less than the threshold value.