Light-adjusting device and solid-state image sensor using the same
A light-adjusting device having first regions and second regions is provided. The light-adjusting device includes pillars that form several groups of meta structures. The groups of meta structures correspond to the first regions, and from a top view, the first regions and the second regions are arranged in a checkerboard pattern.
1. A light-adjusting device having first regions and second regions, comprising:
pillars forming several groups of meta structures;
wherein the groups of meta structures correspond to the first regions, and from a top view, the second regions are free of the groups of meta structures at a center, crossing points of boundaries that divide the first regions and the second regions are free of the groups of meta structures, and the first regions and the second regions are arranged in a checkerboard pattern.
2. The light-adjusting device as claimed in claim 1 , wherein a number of pillars is different in each of the groups of meta structures.
3. The light-adjusting device as claimed in claim 1 , wherein the pillars are divided into first pillars and second pillars, and from a top view, a sectional area of each of the first pillars is larger than a sectional area of each of the second pillars.
4. The light-adjusting device as claimed in claim 3 , wherein in one of the groups of meta structures, one of the first pillars and a closest one of the second pillars define a first period, adjacent two of the second pillars define a second period, and the first period is greater than the second period.
5. The light-adjusting device as claimed in claim 1 , wherein some of the pillars correspond to the second regions.
6. The light-adjusting device as claimed in claim 1 , wherein the first regions and the second regions are staggered in a first direction.
7. The light-adjusting device as claimed in claim 6 , wherein the first regions and the second regions are staggered in a second direction that is perpendicular to the first direction.
8. The light-adjusting device as claimed in claim 6 , wherein the first regions are adjacent to each other along a second direction that is perpendicular to the first direction, and the second regions are adjacent to each other along the second direction.
9. The light-adjusting device as claimed in claim 1 , wherein a distance between adjacent two of the pillars in one of the groups of meta structures is variable.
10. A solid-state image sensor, comprising:
photoelectric conversion elements;
a color filter layer disposed above the photoelectric conversion elements, wherein the color filter layer comprises color filter segments and transparent segments;
condensing structures disposed above the color filter layer; and
a light-adjusting device disposed above the condensing structures, wherein the light-adjusting device has first regions and second regions and comprises:
pillars forming several groups of meta structures,
wherein the groups of meta structures correspond to the first regions, and from a top view, the second regions are free of the groups of meta structures at a center, crossing points of boundaries that divide the first regions and the second regions are free of the groups of meta structures, and the first regions and the second regions are arranged in a checkerboard pattern.
11. The solid-state image sensor as claimed in claim 10 , wherein the first regions are disposed on the color filter segments.
12. The solid-state image sensor as claimed in claim 10 , wherein the first regions are disposed on the transparent segments.
13. The solid-state image sensor as claimed in claim 12 , wherein some of the pillars correspond to the color filter segments.
14. The solid-state image sensor as claimed in claim 12 , wherein the color filter segments comprise red color filter segments, green color filter segments, and blue color filter segments, and some of the pillars correspond to the red color filter segments.
15. The solid-state image sensor as claimed in claim 14 , wherein the pillars form first groups of meta structures, second groups of meta structures, and third groups of meta structures that have different sizes of taper-adjacent-rectangular arrangement, and one of the second regions that corresponds to one of the blue color filter segments is surrounded by two of the first groups of meta structures, one of the second groups of meta structures, and one of the third groups of meta structures.
16. The solid-state image sensor as claimed in claim 10 , wherein the color filter segments and the transparent segments are staggered in a first direction.
17. The solid-state image sensor as claimed in claim 16 , wherein the color filter segments and the transparent segments are staggered in a second direction that is perpendicular to the first direction.
18. The solid-state image sensor as claimed in claim 16 , wherein the color filter segments are adjacent to each other along a second direction that is perpendicular to the first direction, and the transparent segments are adjacent to each other along the second direction.
19. The solid-state image sensor as claimed in claim 10 , wherein the pillars comprise a central pillar in one of the groups of meta structures, and from a top view, a sectional area of the central pillar is larger than a sectional area of other pillars, and the central pillar corresponds to a center of one of the color filter segments or the transparent segments.
20. The solid-state image sensor as claimed in claim 10 , wherein a shortest distance between the condensing structures and the light-adjusting device is greater than a thickness of the light-adjusting device and a thickness of the condensing structures.