Image sensor
AssigneeVisEra Technologies Company Limited
InventorsCheng-Hsuan Lin, Jian-Wen Luo, Ching-Hua Li, Shin-Hong Kuo
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Abstract
An image sensor including a phase detection auto focus (PDAF) sensing unit. The PDAF sensing unit includes a plurality of photodiodes and a hybrid color filter disposed on a group of the plurality of photodiodes. The hybrid color filter includes a first material and a second material directly in contact with each other, an extinction coefficient of the first material is substantially equal to an extinction coefficient of the second material, and an index of refraction of the first material is different from an index of refraction of the second material.
Claims20
An image sensor comprising:
- a phase detection auto focus sensing unit comprising:
- a plurality of photodiodes;
- and
- a hybrid color filter disposed on a group of the plurality of photodiodes, wherein the hybrid color filter comprises a first material and a second material directly in contact with each other, an extinction coefficient of the first material is substantially equal to an extinction coefficient of the second material, and an index of refraction of the first material is different from an index of refraction of the second material,
- wherein the first material and the second material satisfy the following equation:
- |kL(λ1)−kR(λ1)|+|kL(λ2)−kR(λ2)|+ . . . +|kL(λn)−kR(λn)|<(n−1)×0.01,
- in which kL(λ) is the extinction coefficient of the first material, kR(λ) is the extinction coefficient of the second material, n is a positive integer, λ is a filter spectrum of the hybrid color filter and is in a range from 300 nm to 2000 nm, and
- wherein a difference between the index of refraction of the first material and the index of refraction of the second material is less than 2.
Dependencies are inferred from the claim text.