Image sensor
AssigneeVisEra Technologies Company Limited
InventorsKuo-Feng Lin, Wu-Cheng Kuo, Chung-Hao Lin, Yu-Kun Hsiao
Life of this patent
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Abstract
An image sensor includes a sensing layer, a number of filter units, and a grid structure. The filter units are disposed on the sensing layer. The grid structure is disposed on the sensing layer and surrounding each of the filter units. The grid structure includes a first partition wall disposed on the sensing layer and located between two adjacent filter units, and a second partition wall disposed on the first partition wall located between the two adjacent filter units. The refractive index of the first partition wall is less than the refractive index of the second partition wall.
Claims20
An image sensor, comprising:
- a sensing layer;
- a plurality of filter units disposed on the sensing layer;
- and
- a grid structure, disposed on the sensing layer, surrounding each of the filter units, wherein the grid structure comprises:
- a first partition wall, disposed on the sensing layer, located between two adjacent filter units;
- a second partition wall, disposed directly on the first partition wall, located between the two adjacent filter units;
- and
- a first cover element located between the first partition wall and one of the two adjacent filter units, and located between the second partition wall and the one of the two adjacent filter units,
- wherein a first refractive index of the first partition wall is less than a second refractive index of the second partition wall, and a refractive index of the first cover element is less than the first refractive index,
- wherein a bottom surface of the second partition wall that contacts a top surface of the first partition wall is smaller than the top surface of the first partition wall, and
- wherein side surfaces of the first partition wall and the second partition wall, on a same lateral side of the first partition wall and the second partition wall, are stepped and lie in separate planes.
An image sensor, comprising:
- a sensing layer;
- a plurality of filter units disposed on the sensing layer;
- and
- a grid structure, disposed on the sensing layer, surrounding each of the filter units, wherein the grid structure comprises:
- a first partition wall, disposed on the sensing layer, located between two adjacent filter units;
- a second partition wall, disposed directly on the first partition wall, located between the two adjacent filter units;
- and
- a first cover element located between the first partition wall and one of the two adjacent filter units, and located between the second partition wall and the one of the two adjacent filter units,
- wherein a first cross section of the first partition wall and a second cross section of the second partition wall are rectangular or trapezoidal,
- wherein a first width of a top surface the first partition wall that contacts the second partition wall is greater than a second width of a bottom surface of the second partition wall, and the first width and the second width are measured in a transversal direction parallel to the sensing layer,
- wherein a first refractive index of the first partition wall is less than a second refractive index of the second partition wall, and a refractive index of the first cover element is less than the first refractive index, and
- wherein side surfaces of the first partition wall and the second partition wall, on a same lateral side of the first partition wall and the second partition wall, are stepped and lie in separate planes.
Dependencies are inferred from the claim text.