Image sensing device having lens with plurality of portions each corresponding to at least one of plurality of phase-difference detection pixels
An image sensing device includes a pixel array including a plurality of image detection pixels structured to convert light incident onto the image detection pixels into pixel signals representing an image of an object, a plurality of phase-difference detection pixels in the pixel array structured to detect light from the object to generate a phase signal for measuring a distance between the image sensing device and the object, and a first lens positioned to direct light to the plurality of phase-difference detection pixels and including a plurality of portions each corresponding to at least one of the phase-difference detection pixels. A center of the first lens is located over a center of the plurality of phase-difference detection pixels, and each portion of the first lens extends from the center along a row or column direction between adjacent phase-difference detection pixels or along diagonal directions between the row and column directions.
1. An image sensing device comprising:
a pixel array including a plurality of image detection pixels structured to convert light incident onto the image detection pixels into pixel signals representing an image of an object;
a plurality of phase-difference detection pixels in the pixel array structured to detect light from the object to generate a phase signal for measuring a distance between the image sensing device and the object; and
a first lens positioned to direct light to the plurality of phase-difference detection pixels, the first lens being shared by the plurality of phase-difference detection pixels and including a plurality of portions each corresponding to at least one of the plurality of phase-difference detection pixels,
wherein a center of the first lens is located over a center of the plurality of phase-difference detection pixels, and each of the plurality of portions of the first lens extends from the center of the first lens along a row or column direction between adjacent phase-difference detection pixels or along diagonal directions between the row and column directions,
wherein each of the plurality of phase-difference detection pixels are arranged in a (2×2) matrix and corresponds to at least a portion of the first lens,
wherein the row or column direction includes a first straight line passing through a center of the (2×2) matrix and overlapping with a bottom surface of the first lens, and the diagonal directions include a second straight line passing through the center of the (2×2) matrix and overlapping with the bottom surface of the first lens, and
wherein a length of the first straight line is longer than a length of the second straight line.
2. The image sensing device according to claim 1 , wherein the length of the second straight line is within a range from 0.95 to 0.5 times the length of the first straight line.
3. The image sensing device according to claim 1 , wherein the phase-difference detection pixels include optical filters formed below the first lens, and wherein the optical filters include at least one of a red color filter, a green color filter and a blue color filter.
4. The image sensing device according to claim 3 , wherein at least one of the optical filters formed below the first lens is different from the other optical filters formed below the first lens.
5. The image sensing device according to claim 3 , wherein at least one of the optical filters formed below the first lens is the same as the other optical filters formed below the first lens.
6. The image sensing device according to claim 1 , wherein the image detection pixels are arranged adjacent to the (2×2) matrix in the pixel array.
7. The image sensing device according to claim 1 , further comprising a plurality of second lenses arranged over the plurality of image detection pixels.
8. The image sensing device according to claim 7 , wherein the first lens has a center thickness that is greater than a center thickness of the second lens.
9. The image sensing device according to claim 8 , wherein the center thickness of the first lens is greater than the center thickness of the second lens by 100 to 300 Å.
10. The image sensing device according to claim 7 , wherein each of the plurality of image detection pixels includes an optical filter formed below the second lens, and wherein the optical filter is any one of a red color filter, a green color filter and a blue color filter.
11. The image sensing device according to claim 10 , wherein the optical filter further includes a light shielding structure disposed between the phase-difference detection pixel and the image detection pixel and disposed between the image detection pixels.
12. The image sensing device according to claim 11 , wherein the light shielding structure includes tungsten W.
13. An image sensing device comprising:
a pixel array including a plurality of phase-difference detection pixels arranged in a (2×2) matrix and structured to detect light from an object to generate a phase signal that carries information for a distance between the image sensing device and the object; and
a first lens located to direct light to the plurality of phase-difference detection pixels, the first lens being shared by the plurality of phase-difference detection pixels and including a plurality of portions each corresponding to at least one of the plurality of phase-difference detection pixels,
wherein a center of the first lens is located over a center of the (2×2) matrix, and a bottom surface of the first lens is concavely curved toward the center of the first lens, and
wherein each of the plurality of portions of the first lens extends from the center of the first lens along a row or column direction between adjacent phase-difference detection pixels or along diagonal directions between the row and column directions, wherein the row or column direction includes a first straight line passing through a center of the (2×2) matrix and overlapping with a bottom surface of the first lens, and the diagonal directions include a second straight line passing through the center of the (2×2) matrix and overlapping with the bottom surface of the first lens, and
wherein a length of the first straight line is longer than a length of the second straight line.
14. The image sensing device according to claim 13 , wherein each of the plurality of portions of the first lens extends from the center of the first lens along a row direction and a column direction between adjacent phase-difference detection pixels.