US20200312914A1 - Optical devices with light collection elements formed in pixels - Google Patents
Optical devices with light collection elements formed in pixels Download PDFInfo
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- US20200312914A1 US20200312914A1 US16/371,634 US201916371634A US2020312914A1 US 20200312914 A1 US20200312914 A1 US 20200312914A1 US 201916371634 A US201916371634 A US 201916371634A US 2020312914 A1 US2020312914 A1 US 2020312914A1
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- 230000003287 optical effect Effects 0.000 title claims abstract description 66
- 239000012044 organic layer Substances 0.000 claims abstract description 101
- 239000010410 layer Substances 0.000 claims abstract description 30
- 239000002184 metal Substances 0.000 description 37
- 239000000758 substrate Substances 0.000 description 33
- 230000002093 peripheral effect Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/30—Devices specially adapted for multicolour light emission
- H10K59/38—Devices specially adapted for multicolour light emission comprising colour filters or colour changing media [CCM]
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- H01L27/307—
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
- G02B5/201—Filters in the form of arrays
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
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- H01L51/447—
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K30/00—Organic devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation
- H10K30/80—Constructional details
- H10K30/87—Light-trapping means
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/85—Arrangements for extracting light from the devices
- H10K50/856—Arrangements for extracting light from the devices comprising reflective means
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/85—Arrangements for extracting light from the devices
- H10K50/858—Arrangements for extracting light from the devices comprising refractive means, e.g. lenses
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/30—Devices specially adapted for multicolour light emission
- H10K59/35—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels
- H10K59/353—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels characterised by the geometrical arrangement of the RGB subpixels
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K39/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic radiation-sensitive element covered by group H10K30/00
- H10K39/30—Devices controlled by radiation
- H10K39/32—Organic image sensors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/549—Organic PV cells
Definitions
- the invention relates to an optical device, and more particularly to an optical device with light collection elements of different dimensions or positions formed above color filters.
- WGCF wave guide color filter
- an optical device in accordance with one embodiment of the invention, includes a central region having a plurality of central pixels, a first region having a plurality of first pixels, a second region having a plurality of second pixels, an organic layer formed in the central region, the first region and the second region, a light collection layer surrounded by the organic layer formed in the first region and the second region, a first light collection element of the light collection layer formed in the first pixel, and a second light collection element of the light collection layer formed in the second pixel.
- the central region, the first region and the second region are spaced from each other along an arrangement direction.
- the first region is closer to the central region than the second region.
- the first light collection element is different from the second light collection element.
- the center of the first light collection element departs from the center of the first pixel along a direction opposite to the arrangement direction of the central region, the first region and the second region.
- the center of the second light collection element departs from the center of the second pixel along the direction opposite to the arrangement direction of the central region, the first region and the second region.
- the first distance is the same as the second distance.
- the second light collection element has a width which is greater than that of the first light collection element. In some embodiments, the width of the first light collection element is greater than zero. The width of the second light collection element is less than a width of the second pixel. In some embodiments, the second light collection element has an upper surface area which is greater than that of the first light collection element. In some embodiments, the second light collection element has a thickness which is greater than that of the first light collection element. In some embodiments, the thickness of the second light collection element is greater than that of the organic layer. In some embodiments, the first light collection element and the second light collection element are further covered by the organic layer.
- a part of the second light collection element extends further into a color filter underneath the second light collection element. In some embodiments, the part of the second light collection element that extends into the color filter has a thickness that is less than one third of that of the color filter.
- the second light collection element has a width which is greater than that of the first light collection element.
- the second light collection element has a thickness which is greater than that of the first light collection element.
- the second light collection element extends further over a patterned organic layer surrounding a color filter underneath the second light collection element.
- the patterned organic layer has a refractive index which is in a range from about 1.2 to about 1.45.
- the first light collection element and the second light collection element have a refractive index which is greater than those of color filters respectively underneath the first light collection element and the second light collection element. In some embodiments, the first light collection element and the second light collection element have a refractive index which is in a range from about 1.6 to about 1.9. In some embodiments, the optical device further includes an anti-reflection layer formed on the organic layer, the first light collection element and the second light collection element. In some embodiments, the first light collection element and the second light collection element have a refractive index which is greater than that of the anti-reflection layer.
- the width (or thickness) of the light collection element disposed in the pixel far from the central pixel is greater than that of the light collection element disposed in the pixel adjacent to the central pixel.
- the distance between the central point of the pixel and the central point of the light collection element (i.e. the departure distance of the light collection element from the central point of the pixel) in the pixel far from the central pixel is greater than that between the central point of the pixel and the central point of the light collection element in the pixel adjacent to the central pixel.
- the departure direction of the light collection elements is opposite to the pixel-arrangement direction. Also, the departure direction of the light collection elements in the pixels is correspondingly altered in accordance with various pixel-arrangement directions. In addition, the refractive index of the light collection element is higher than that of adjacent materials.
- FIG. 1 is a top view of pixel arrangement of an optical device in accordance with one embodiment of the invention.
- FIG. 2 is a top view of the pixel structures of an optical device in accordance with one embodiment of the invention.
- FIG. 3 is a cross-sectional view of the pixel structures of an optical device in accordance with one embodiment of the invention.
- FIG. 4 is a top view of the pixel structures of an optical device in accordance with one embodiment of the invention.
- FIG. 5 is a cross-sectional view of the pixel structures of an optical device in accordance with one embodiment of the invention.
- FIG. 6 is a top view of the pixel structures of an optical device in accordance with one embodiment of the invention.
- FIG. 7 is a cross-sectional view of the pixel structures of an optical device in accordance with one embodiment of the invention.
- FIG. 8 is a top view of the pixel structures of an optical device in accordance with one embodiment of the invention.
- FIG. 9 is a cross-sectional view of the pixel structures of an optical device in accordance with one embodiment of the invention.
- FIG. 10 is a top view of the pixel structures of an optical device in accordance with one embodiment of the invention.
- FIG. 11 is a cross-sectional view of the pixel structures of an optical device in accordance with one embodiment of the invention.
- FIG. 12 shows a QE peak of an optical device in accordance with one embodiment of the invention.
- FIG. 1 is a top view of pixel arrangement of the optical device 10 .
- FIG. 2 is a top view of the pixel structures of the optical device 10 .
- FIG. 3 is a cross-sectional view of the pixel structures of the optical device 10 .
- the optical device 10 includes a substrate 12 which includes a central region 14 , a first region 16 , a second region 18 and a third region 20 .
- the central region 14 , the first region 16 , the second region 18 and the third region 20 are spaced from each other.
- the first region 16 is closer to the central region 14 than the second region 18 .
- the second region 18 is closer to the first region 16 than the third region 20 .
- the central region 14 has a plurality of central pixels, for example 14 a , 14 b , 14 c and 14 d .
- the first region 16 has a plurality of first pixels, for example 16 a , 16 b , 16 c and 16 d .
- the second region 18 has a plurality of second pixels, for example 18 a , 18 b , 18 c and 18 d .
- the third region 20 has a plurality of third pixels, for example 20 a , 20 b , 20 c and 20 d .
- the central pixels (ex. 14 a , 14 b , 14 c and 14 d ) in the central region 14 the first pixels (ex. 16 a , 16 b , 16 c and 16 d ) in the first region 16 , the second pixels (ex. 18 a , 18 b , 18 c and 18 d ) in the second region 18 , and the third pixels (ex.
- the pixel-arrangement direction 22 a represents the direction in which the pixels are arranged diagonally from the center to the bottom left of the substrate 12 .
- the pixel-arrangement direction 22 b represents the direction in which the pixels are arranged horizontally (along x-axis) from the center to the left of the substrate 12 .
- the pixel-arrangement direction 22 c represents the direction in which the pixels are arranged diagonally from the center to the top left of the substrate 12 .
- the pixel-arrangement direction 22 d represents the direction in which the pixels are arranged perpendicularly (along y-axis) from the center to the top of the substrate 12 .
- the pixel-arrangement direction 22 e represents the direction in which the pixels are arranged diagonally from the center to the top right of the substrate 12 .
- the pixel-arrangement direction 22 f represents the direction in which the pixels are arranged horizontally (along x-axis) from the center to the right of the substrate 12 .
- the pixel-arrangement direction 22 g represents the direction in which the pixels are arranged diagonally from the center to the bottom right of the substrate 12 .
- the pixel-arrangement direction 22 h represents the direction in which the pixels are arranged perpendicularly (along y-axis) from the center to the bottom of the substrate 12 .
- the arrangement of the central pixels (ex. 14 a , 14 b , 14 c and 14 d ), the first pixels (ex. 16 a , 16 b , 16 c and 16 d ), the second pixels (ex. 18 a , 18 b , 18 c and 18 d ), and the third pixels (ex. 20 a , 20 b , 20 c and 20 d ) along the pixel-arrangement direction 22 a is exemplary.
- the central pixel 14 a , the first pixel 16 a , the second pixel 18 a and the third pixel 20 a include green (G) color filters 22 .
- the central pixel 14 b , the first pixel 16 b , the second pixel 18 b and the third pixel 20 b include red (R) color filters 24 .
- the central pixel 14 c , the first pixel 16 c , the second pixel 18 c and the third pixel 20 c include blue (B) color filters 26 .
- the central pixel 14 d , the first pixel 16 d , the second pixel 18 d and the third pixel 20 d include green (G) color filters 22 .
- the central pixel 14 a , the first pixel 16 a , the second pixel 18 a and the third pixel 20 a are exemplary for demonstrating various pixel structures thereamong.
- the central pixel 14 a includes a plurality of metal grids 28 , a patterned first organic layer 30 , a color filter 32 , and a second organic layer 34 .
- the metal grids 28 are formed on the substrate 12 .
- the patterned first organic layer 30 is formed on the metal grids 28 .
- the color filter 32 is surrounded by the patterned first organic layer 30 .
- the second organic layer 34 is formed on the patterned first organic layer 30 and the color filter 32 .
- Each of the first pixel 16 a , the second pixel 18 a and the third pixel 20 a includes a plurality of metal grids 28 , a patterned first organic layer 30 , a color filter 32 , a second organic layer 34 , and a light collection element 36 .
- the metal grids 28 are formed on the substrate 12 .
- the patterned first organic layer 30 is formed on the metal grids 28 .
- the color filter 32 is surrounded by the patterned first organic layer 30 .
- the second organic layer 34 is formed on the patterned first organic layer 30 and the color filter 32 .
- the light collection element 36 is surrounded by the second organic layer 34 . Specifically, the refractive index of the light collection element 36 is greater than that of the second organic layer 34 .
- a first distance “D 1 ” between the central point “Ps” of the first pixel 16 a and the central point “P L ” of the light collection element 36 is defined.
- a second distance “D 2 ” between the central point “Ps” of the second pixel 18 a and the central point “P L ” of the light collection element 36 is defined.
- a third distance “D 3 ” between the central point “Ps” of the third pixel 20 a and the central point “P L ” of the light collection element 36 is defined.
- the first distance “D 1 ”, the second distance “D 2 ” and the third distance “D 3 ” are different thereamong.
- the central point “P L ” of the light collection element 36 in the first pixel 16 a departs from the central point “Ps” of the first pixel 16 a along a direction 42 .
- the central point “P L ” of the light collection element 36 in the second pixel 18 a departs from the central point “Ps” of the second pixel 18 a along the direction 42 .
- the central point “P L ” of the light collection element 36 in the third pixel 20 a departs from the central point “Ps” of the third pixel 20 a along the direction 42 .
- the departure direction 42 represents the direction in which the central points “P L ” of the light collection elements 36 depart diagonally from the central points “Ps” towards the top right of the first pixel 16 a , the second pixel 18 a and the third pixel 20 a respectively.
- the central pixel 14 a , the first pixel 16 a , the second pixel 18 a , and the third pixel 20 a are arranged along the pixel-arrangement direction 22 a (i.e. a direction that the pixels are arranged diagonally from the center to the bottom left of the substrate 12 ), as shown in FIG. 1 . Therefore, the departure direction 42 of the light collection elements 36 is opposite to the pixel-arrangement direction 22 a.
- the departure direction 42 of the light collection elements 36 correspondingly alters in accordance with various pixel-arrangement directions to ensure that the departure direction of the light collection element is opposite to the pixel-arrangement direction.
- the central pixel 14 a , the first pixel 16 a , the second pixel 18 a , and the third pixel 20 a are arranged along the pixel-arrangement direction 22 b (i.e.
- the central points “P L ” of the light collection elements 36 depart horizontally from the central points “Ps” towards the right of the first pixel 16 a , the second pixel 18 a and the third pixel 20 a respectively.
- the central pixel 14 a , the first pixel 16 a , the second pixel 18 a , and the third pixel 20 a are arranged along the pixel-arrangement direction 22 c (i.e.
- the central points “P L ” of the light collection elements 36 depart diagonally from the central points “Ps” towards the bottom right of the first pixel 16 a , the second pixel 18 a and the third pixel 20 a respectively.
- the central pixel 14 a , the first pixel 16 a , the second pixel 18 a , and the third pixel 20 a are arranged along the pixel-arrangement direction 22 d (i.e.
- the central points “P L ” of the light collection elements 36 depart perpendicularly from the central points “Ps” towards the bottom of the first pixel 16 a , the second pixel 18 a and the third pixel 20 a respectively.
- the central pixel 14 a , the first pixel 16 a , the second pixel 18 a , and the third pixel 20 a are arranged along the pixel-arrangement direction 22 e (i.e.
- the central points “P L ” of the light collection elements 36 depart diagonally from the central points “Ps” towards the bottom left of the first pixel 16 a , the second pixel 18 a and the third pixel 20 a respectively.
- the central pixel 14 a , the first pixel 16 a , the second pixel 18 a , and the third pixel 20 a are arranged along the pixel-arrangement direction 22 f (i.e.
- the central points “P L ” of the light collection elements 36 depart horizontally from the central points “Ps” towards the left of the first pixel 16 a , the second pixel 18 a and the third pixel 20 a respectively.
- the central pixel 14 a , the first pixel 16 a , the second pixel 18 a , and the third pixel 20 a are arranged along the pixel-arrangement direction 22 g (i.e.
- the central points “P L ” of the light collection elements 36 depart diagonally from the central points “Ps” towards the top left of the first pixel 16 a , the second pixel 18 a and the third pixel 20 a respectively.
- the central pixel 14 a , the first pixel 16 a , the second pixel 18 a , and the third pixel 20 a are arranged along the pixel-arrangement direction 22 h (i.e.
- the central points “P L ” of the light collection elements 36 depart perpendicularly from the central points “Ps” towards the top of the first pixel 16 a , the second pixel 18 a and the third pixel 20 a respectively.
- the third distance “D 3 ” in the third pixel 20 a is greater than the second distance “D 2 ” in the second pixel 18 a .
- the second distance “D 2 ” in the second pixel 18 a is greater than the first distance “D 1 ” in the first pixel 16 a .
- the first distance “D 1 ” in the first pixel 16 a is greater than zero.
- the patterned first organic layer 30 has a refractive index which is in a range from about 1.2 to about 1.45. In some embodiments, the refractive index of the light collection element 36 is greater than that of the color filter 32 . In some embodiments, the refractive index of the light collection element 36 is in a range from about 1.6 to about 1.9. In some embodiments, each of the central pixel 14 a , the first pixel 16 a , the second pixel 18 a and the third pixel 20 a further includes an oxide layer 38 which covers the metal grids 28 .
- each of the central pixel 14 a , the first pixel 16 a , the second pixel 18 a and the third pixel 20 a further includes an anti-reflection layer 40 formed on the second organic layer 34 .
- the refractive index of the light collection element 36 is greater than that of the anti-reflection layer 40 .
- FIG. 4 is a top view of the pixel structures of the optical device 10 .
- FIG. 5 is a cross-sectional view of the pixel structures of the optical device 10 .
- the arrangement of the central pixels (ex. 14 a , 14 b , 14 c and 14 d ), the first pixels (ex. 16 a , 16 b , 16 c and 16 d ), the second pixels (ex. 18 a , 18 b , 18 c and 18 d ), and the third pixels (ex. 20 a , 20 b , 20 c and 20 d ) along the pixel-arrangement direction 22 a is exemplary.
- the central pixel 14 a , the first pixel 16 a , the second pixel 18 a and the third pixel 20 a include green (G) color filters 22 .
- the central pixel 14 b , the first pixel 16 b , the second pixel 18 b and the third pixel 20 b include red (R) color filters 24 .
- the central pixel 14 c , the first pixel 16 c , the second pixel 18 c and the third pixel 20 c include blue (B) color filters 26 .
- the central pixel 14 d , the first pixel 16 d , the second pixel 18 d and the third pixel 20 d include green (G) color filters 22 .
- the central pixel 14 a , the first pixel 16 a , the second pixel 18 a and the third pixel 20 a are exemplary for demonstrating various pixel structures thereamong.
- the central pixel 14 a includes a plurality of metal grids 28 , a patterned first organic layer 30 , a color filter 32 , and a second organic layer 34 .
- the metal grids 28 are formed on the substrate 12 .
- the patterned first organic layer 30 is formed on the metal grids 28 .
- the color filter 32 is surrounded by the patterned first organic layer 30 .
- the second organic layer 34 is formed on the patterned first organic layer 30 and the color filter 32 .
- Each of the first pixel 16 a , the second pixel 18 a and the third pixel 20 a includes a plurality of metal grids 28 , a patterned first organic layer 30 , a color filter 32 , a second organic layer 34 , and a light collection element 36 .
- the metal grids 28 are formed on the substrate 12 .
- the patterned first organic layer 30 is formed on the metal grids 28 .
- the color filter 32 is surrounded by the patterned first organic layer 30 .
- the second organic layer 34 is formed on the patterned first organic layer 30 and the color filter 32 .
- the light collection element 36 is surrounded by the second organic layer 34 . Specifically, the refractive index of the light collection element 36 is greater than that of the second organic layer 34 .
- a first distance between the central point “Ps” of the first pixel 16 a and the central point “P L ” of the light collection element 36 is defined.
- a second distance between the central point “Ps” of the second pixel 18 a and the central point “P L ” of the light collection element 36 is defined.
- a third distance between the central point “Ps” of the third pixel 20 a and the central point “P L ” of the light collection element 36 is defined.
- the first distance, the second distance and the third distance are zero.
- the central point “P L ” of the light collection element 36 in the first pixel 16 a and the central point “Ps” of the first pixel 16 a overlap.
- the central point “P L ” of the light collection element 36 in the second pixel 18 a and the central point “Ps” of the second pixel 18 a overlap.
- the central point “P L ” of the light collection element 36 in the third pixel 20 a and the central point “Ps” of the third pixel 20 a overlap. That is, there is no departure of the central points “P L ” of the light collection elements 36 from the central points “Ps” of the first pixel 16 a , the second pixel 18 a and the third pixel 20 a respctively.
- a first width “W 1 ” of the light collection element 36 in the first pixel 16 a is defined.
- a second width “W 2 ” of the light collection element 36 in the second pixel 18 a is defined.
- a third width “W 3 ” of the light collection element 36 in the third pixel 20 a is defined. Specifically, the third width “W 3 ” of the light collection element 36 in the third pixel 20 a is greater than the second width “W 2 ” of the light collection element 36 in the second pixel 18 a .
- the second width “W 2 ” of the light collection element 36 in the second pixel 18 a is greater than the first width “W 1 ” of the light collection element 36 in the first pixel 16 a .
- the first width “W 1 ” of the light collection element 36 in the first pixel 16 a is greater than zero.
- the third width “W 3 ” of the light collection element 36 in the third pixel 20 a is smaller than the width “W” of the third pixel 20 a .
- a first area “A 1 ” of the light collection element 36 in the first pixel 16 a is defined.
- a second area “A 2 ” of the light collection element 36 in the second pixel 18 a is defined.
- a third area “A 3 ” of the light collection element 36 in the third pixel 20 a is defined. Similarly, the third area “A 3 ” of the light collection element 36 in the third pixel 20 a is greater than the second area “A 2 ” of the light collection element 36 of the second pixel 18 a . The second area “A 2 ” of the light collection element 36 of the second pixel 18 a is greater than the first area “A 1 ” of the light collection element 36 of the first pixel 16 a.
- the patterned first organic layer 30 has a refractive index which is in a range from about 1.2 to about 1.45. In some embodiments, the refractive index of the light collection element 36 is greater than that of the color filter 32 . In some embodiments, the refractive index of the light collection element 36 is in a range from about 1.6 to about 1.9. In some embodiments, each of the central pixel 14 a , the first pixel 16 a , the second pixel 18 a and the third pixel 20 a further includes an oxide layer 38 which covers the metal grids 28 .
- each of the central pixel 14 a , the first pixel 16 a , the second pixel 18 a and the third pixel 20 a further includes an anti-reflection layer 40 formed on the second organic layer 34 .
- the refractive index of the light collection element 36 is greater than that of the anti-reflection layer 40 .
- FIG. 6 is a top view of the pixel structures of the optical device 10 .
- FIG. 7 is a cross-sectional view of the pixel structures of the optical device 10 .
- the arrangement of the central pixels (ex. 14 a , 14 b , 14 c and 14 d ), the first pixels (ex. 16 a , 16 b , 16 c and 16 d ), the second pixels (ex. 18 a , 18 b , 18 c and 18 d ), and the third pixels ( 20 a , 20 b , 20 c and 20 c ) along the pixel-arrangement direction 22 a is exemplary.
- the central pixel 14 a , the first pixel 16 a , the second pixel 18 a and the third pixel 20 a include green (G) color filters 22 .
- the central pixel 14 b , the first pixel 16 b , the second pixel 18 b and the third pixel 20 b include red (R) color filters 24 .
- the central pixel 14 c , the first pixel 16 c , the second pixel 18 c and the third pixel 20 c include blue (B) color filters 26 .
- the central pixel 14 d , the first pixel 16 d , the second pixel 18 d and the third pixel 20 d include green (G) color filters 22 .
- the central pixel 14 a , the first pixel 16 a , the second pixel 18 a and the third pixel 20 a are exemplary for demonstrating various subpixel structures thereamong.
- the central pixel 14 a includes a plurality of metal grids 28 , a patterned first organic layer 30 , a color filter 32 , and a second organic layer 34 .
- the metal grids 28 are formed on the substrate 12 .
- the patterned first organic layer 30 is formed on the metal grids 28 .
- the color filter 32 is surrounded by the patterned first organic layer 30 .
- the second organic layer 34 is formed on the patterned first organic layer 30 and the color filter 32 .
- Each of the first pixel 16 a , the second pixel 18 a and the third pixel 20 a includes a plurality of metal grids 28 , a patterned first organic layer 30 , a color filter 32 , a second organic layer 34 , and a light collection element 36 .
- the metal grids 28 are formed on the substrate 12 .
- the patterned first organic layer 30 is formed on the metal grids 28 .
- the color filter 32 is surrounded by the patterned first organic layer 30 .
- the second organic layer 34 is formed on the patterned first organic layer 30 and the color filter 32 .
- the light collection element 36 is surrounded by the second organic layer 34 . Specifically, the refractive index of the light collection element 36 is greater than that of the second organic layer 34 .
- a first distance between the central point “Ps” of the first pixel 16 a and the central point “P L ” of the light collection element 36 is defined.
- a second distance between the central point “Ps” of the second pixel 18 a and the central point “P L ” of the light collection element 36 is defined.
- a third distance between the central point “Ps” of the third pixel 20 a and the central point “P L ” of the light collection element 36 is defined.
- the first distance, the second distance and the third distance are zero.
- the central point “P L ” of the light collection element 36 in the first pixel 16 a and the central point “Ps” of the first pixel 16 a overlap.
- the central point “P L ” of the light collection element 36 in the second pixel 18 a and the central point “Ps” of the second pixel 18 a overlap.
- the central point “P L ” of the light collection element 36 in the third pixel 20 a and the central point “Ps” of the third pixel 20 a overlap. That is, there is no departure of the central points “P L ” of the light collection elements 36 from the central points “Ps” of the first pixel 16 a , the second pixel 18 a and the third pixel 20 a respectively.
- the first thickness “T 1 ” of the light collection element 36 in the first pixel 16 a is defined.
- the second thickness “T 2 ” of the light collection element 36 in the second pixel 18 a is defined.
- the third thickness “T 3 ” of the light collection element 36 in the third pixel 20 a is defined. Specifically, the third thickness “T 3 ” of the light collection element 36 in the third pixel 20 a is greater than the second thickness “T 2 ” of the light collection element 36 in the second pixel 18 a .
- the second thickness “T 2 ” of the light collection element 36 in the second pixel 18 a is greater than the first thickness “T 1 ” of the light collection element 36 in the first pixel 16 a .
- the second thickness “T 2 ” of the light collection element 36 in the second pixel 18 a is greater than the thickness “T L ” of the second organic layer 34 .
- the light collection elements 36 respectively in the first pixel 16 a , the second pixel 18 a and the third pixel 20 a are further covered by the second organic layer 34 (not shown).
- the patterned first organic layer 30 has a refractive index which is in a range from about 1.2 to about 1.45. In some embodiments, the refractive index of the light collection element 36 is greater than that of the color filter 32 . In some embodiments, the refractive index of the light collection element 36 is in a range from about 1.6 to about 1.9. In some embodiments, each of the central pixel 14 a , the first pixel 16 a , the second pixel 18 a and the third pixel 20 a further includes an oxide layer 38 which covers the metal grids 28 .
- each of the central pixel 14 a , the first pixel 16 a , the second pixel 18 a and the third pixel 20 a further includes an anti-reflection layer 40 formed on the second organic layer 34 .
- the refractive index of the light collection element 36 is greater than that of the anti-reflection layer 40 .
- FIG. 8 is a top view of the pixel structures of the optical device 10 .
- FIG. 9 is a cross-sectional view of the pixel structures of the optical device 10 .
- the arrangement of the central pixels (ex. 14 a , 14 b , 14 c and 14 d ), the first pixels (ex. 16 a , 16 b , 16 c and 16 d ), the second pixels (ex. 18 a , 18 b , 18 c and 18 d ), and the third pixels (ex. 20 a , 20 b , 20 c and 20 d ) along the pixel-arrangement direction 22 a is exemplary.
- the central pixel 14 a , the first pixel 16 a , the second pixel 18 a and the third pixel 20 a include green (G) color filters 22 .
- the central pixel 14 b , the first pixel 16 b , the second pixel 18 b and the third pixel 20 b include red (R) color filters 24 .
- the central pixel 14 c , the first pixel 16 c , the second pixel 18 c and the third pixel 20 c include blue (B) color filters 26 .
- the central pixel 14 d , the first pixel 16 d , the second pixel 18 d and the third pixel 20 d include green (G) color filters 22 .
- the central pixel 14 a , the first pixel 16 a , the second pixel 18 a and the third pixel 20 a are exemplary for demonstrating various subpixel structures thereamong.
- the central pixel 14 a includes a plurality of metal grids 28 , a patterned first organic layer 30 , a color filter 32 , and a second organic layer 34 .
- the metal grids 28 are formed on the substrate 12 .
- the patterned first organic layer 30 is formed on the metal grids 28 .
- the color filter 32 is surrounded by the patterned first organic layer 30 .
- the second organic layer 34 is formed on the patterned first organic layer 30 and the color filter 32 .
- Each of the first pixel 16 a , the second pixel 18 a and the third pixel 20 a includes a plurality of metal grids 28 , a patterned first organic layer 30 , a color filter 32 , a second organic layer 34 , and a light collection element 36 .
- the metal grids 28 are formed on the substrate 12 .
- the patterned first organic layer 30 is formed on the metal grids 28 .
- the color filter 32 is surrounded by the patterned first organic layer 30 .
- the second organic layer 34 is formed on the patterned first organic layer 30 and the color filter 32 .
- the light collection element 36 is surrounded by the second organic layer 34 . Specifically, the refractive index of the light collection element 36 is greater than that of the second organic layer 34 .
- a first distance between the central point “Ps” of the first pixel 16 a and the central point “P L ” of the light collection element 36 is defined.
- a second distance between the central point “Ps” of the second pixel 18 a and the central point “P L ” of the light collection element 36 is defined.
- a third distance between the central point “Ps” of the third pixel 20 a and the central point “P L ” of the light collection element 36 is defined.
- the first distance, the second distance and the third distance are zero.
- the central point “P L ” of the light collection element 36 in the first pixel 16 a and the central point “Ps” of the first pixel 16 a overlap.
- the central point “P L ” of the light collection element 36 in the second pixel 18 a and the central point “Ps” of the second pixel 18 a overlap.
- the central point “P L ” of the light collection element 36 in the third pixel 20 a and the central point “Ps” of the third pixel 20 a overlap. That is, there is no departure of the central points “P L ” of the light collection elements 36 from the central points “Ps” of the first pixel 16 a , the second pixel 18 a and the third pixel 20 a respectively.
- a part of the light collection element 36 in the second pixel 18 a extends further into the color filter 32 .
- a part of the light collection element 36 in the third pixel 20 a extends further into the color filter 32 .
- the first thickness “T 1 ” of the light collection element 36 in the first pixel 16 a is defined.
- the second thickness “T 2 ” of the light collection element 36 in the second pixel 18 a is defined.
- the third thickness “T 3 ” of the light collection element 36 in the third pixel 20 a is defined.
- the third thickness “T 3 ” of the light collection element 36 in the third pixel 20 a is greater than the second thickness “T 2 ” of the light collection element 36 in the second pixel 18 a .
- the second thickness “T 2 ” of the light collection element 36 in the second pixel 18 a is greater than the first thickness “T 1 ” of the light collection element 36 in the first pixel 16 a .
- the thickness “T 3 L ” of the part of the light collection element 36 that extends into the color filter 32 is less than one third of the thickness “T CF ” of the color filter 32 .
- the patterned first organic layer 30 has a refractive index which is in a range from about 1.2 to about 1.45. In some embodiments, the refractive index of the light collection element 36 is greater than that of the color filter 32 . In some embodiments, the refractive index of the light collection element 36 is in a range from about 1.6 to about 1.9. In some embodiments, each of the central pixel 14 a , the first pixel 16 a , the second pixel 18 a and the third pixel 20 a further includes an oxide layer 38 which covers the metal grids 28 .
- each of the central pixel 14 a , the first pixel 16 a , the second pixel 18 a and the third pixel 20 a further includes an anti-reflection layer 40 formed on the second organic layer 34 .
- the refractive index of the light collection element 36 is greater than that of the anti-reflection layer 40 .
- FIG. 10 is a top view of the pixel structures of the optical device 10 .
- FIG. 11 is a cross-sectional view of the pixel structures of the optical device 10 .
- the arrangement of the central pixels (ex. 14 a , 14 b , 14 c and 14 d ), the first pixels (ex. 16 a , 16 b , 16 c and 16 d ), the second pixels (ex. 18 a , 18 b , 18 c and 18 d ), and the third pixels (ex. 20 a , 20 b , 20 c and 20 d ) along the pixel-arrangement direction 22 a is exemplary.
- the central pixel 14 a , the first pixel 16 a , the second pixel 18 a and the third pixel 20 a include green (G) color filters 22 .
- the central pixel 14 b , the first pixel 16 b , the second pixel 18 b and the third pixel 20 b include red (R) color filters 24 .
- the central pixel 14 c , the first pixel 16 c , the second pixel 18 c and the third pixel 20 c include blue (B) color filters 26 .
- the central pixel 14 d , the first pixel 16 d , the second pixel 18 d and the third pixel 20 d include green (G) color filters 22 .
- the central pixel 14 a , the first pixel 16 a , the second pixel 18 a and the third pixel 20 a are exemplary for demonstrating various subpixel structures thereamong.
- the central pixel 14 a includes a plurality of metal grids 28 , a patterned first organic layer 30 , a color filter 32 , and a second organic layer 34 .
- the metal grids 28 are formed on the substrate 12 .
- the patterned first organic layer 30 is formed on the metal grids 28 .
- the color filter 32 is surrounded by the patterned first organic layer 30 .
- the second organic layer 34 is formed on the patterned first organic layer 30 and the color filter 32 .
- Each of the first pixel 16 a , the second pixel 18 a and the third pixel 20 a includes a plurality of metal grids 28 , a patterned first organic layer 30 , a color filter 32 , a second organic layer 34 , and a light collection element 36 .
- the metal grids 28 are formed on the substrate 12 .
- the patterned first organic layer 30 is formed on the metal grids 28 .
- the color filter 32 is surrounded by the patterned first organic layer 30 .
- the second organic layer 34 is formed on the patterned first organic layer 30 and the color filter 32 .
- the light collection element 36 is surrounded by the second organic layer 34 . Specifically, the refractive index of the light collection element 36 is greater than that of the second organic layer 34 .
- a first distance “D 1 ” between the central point “Ps” of the first pixel 16 a and the central point “P L ” of the light collection element 36 is defined.
- a second distance “D 2 ” between the central point “Ps” of the second pixel 18 a and the central point “P L ” of the light collection element 36 is defined.
- a third distance “D 3 ” between the central point “Ps” of the third pixel 20 a and the central point “P L ” of the light collection element 36 is defined.
- the first distance “D 1 ”, the second distance “D 2 ” and the third distance “D 3 ” are different thereamong.
- the central point “P L ” of the light collection element 36 in the first pixel 16 a departs from the central point “Ps” of the first pixel 16 a along a direction 42 .
- the central point “P L ” of the light collection element 36 in the second pixel 18 a departs from the central point “Ps” of the second pixel 18 a along the direction 42 .
- the central point “P L ” of the light collection element 36 in the third pixel 20 a departs from the central point “Ps” of the third pixel 20 a along the direction 42 .
- the departure direction 42 represents the direction in which the central points “P L ” of the light collection elements 36 depart diagonally from the central points “Ps” to the top right of the first pixel 16 a , the second pixel 18 a and the third pixel 20 a respectively.
- the central pixel 14 a , the first pixel 16 a , the second pixel 18 a , and the third pixel 20 a are arranged along the pixel-arrangement direction 22 a (i.e. a direction that the pixels are arranged diagonally from the center to the bottom left of the substrate 12 ), as shown in FIG. 1 . Therefore, the direction 42 is opposite to the pixel-arrangement direction 22 a .
- the third distance “D 3 ” in the third pixel 20 a is greater than the second distance “D 2 ” in the second pixel 18 a .
- the second distance “D 2 ” in the second pixel 18 a is greater than the first distance “D 1 ” in the first pixel 16 a .
- the first distance “D 1 ” in the first pixel 16 a is greater than zero.
- a first width “W 1 ” of the light collection element 36 in the first pixel 16 a is defined.
- a second width “W 2 ” of the light collection element 36 in the second pixel 18 a is defined.
- a third width “W 3 ” of the light collection element 36 in the third pixel 20 a is defined. Specifically, the third width “W 3 ” of the light collection element 36 in the third pixel 20 a is greater than the second width “W 2 ” of the light collection element 36 in the second pixel 18 a .
- the second width “W 2 ” of the light collection element 36 in the second pixel 18 a is greater than the first width “W 1 ” of the light collection element 36 in the first pixel 16 a .
- the first width “W 1 ” of the light collection element 36 in the first pixel 16 a is greater than zero.
- the third width “W 3 ” of the light collection element 36 in the third pixel 20 a is smaller than the width “W” of the third pixel 20 a .
- the light collection element 36 in the third pixel 20 a extends further over the patterned first organic layer 30 , as shown in FIG. 11 .
- a first area “A 1 ” of the light collection element 36 in the first pixel 16 a is defined.
- a second area “A 2 ” of the light collection element 36 in the second pixel 18 a is defined.
- a third area “A 3 ” of the light collection element 36 in the third pixel 20 a is defined.
- the third area “A 3 ” of the light collection element 36 in the third pixel 20 a is greater than the second area “A 2 ” of the light collection element 36 in the second pixel 18 a .
- the second area “A 2 ” of the light collection element 36 in the second pixel 18 a is greater than the first area “A 1 ” of the light collection element 36 in the first pixel 16 a.
- the first thickness “T 1 ” of the light collection element 36 in the first pixel 16 a is defined.
- the second thickness “T 2 ” of the light collection element 36 in the second pixel 18 a is defined.
- the third thickness “T 3 ” of the light collection element 36 in the third pixel 20 a is defined. Specifically, the third thickness “T 3 ” of the light collection element 36 in the third pixel 20 a is greater than the second thickness “T 2 ” of the light collection element 36 in the second pixel 18 a .
- the second thickness “T 2 ” of the light collection element 36 in the second pixel 18 a is greater than the first thickness “T 1 ” of the light collection element 36 in the first pixel 16 a .
- the second thickness “T 2 ” of the light collection element 36 in the second pixel 18 a is greater than the thickness “T L ” of the second organic layer 34 .
- the light collection elements 36 respectively in the first pixel 16 a , the second pixel 18 a and the third pixel 20 a are further covered by the second organic layer 34 (not shown).
- the patterned first organic layer 30 has a refractive index which is in a range from about 1.2 to about 1.45. In some embodiments, the refractive index of the light collection element 36 is greater than that of the color filter 32 . In some embodiments, the refractive index of the light collection element 36 is in a range from about 1.6 to about 1.9. In some embodiments, each of the central pixel 14 a , the first pixel 16 a , the second pixel 18 a and the third pixel 20 a further includes an oxide layer 38 which covers the metal grids 28 .
- each of the central pixel 14 a , the first pixel 16 a , the second pixel 18 a and the third pixel 20 a further includes an anti-reflection layer 40 formed on the second organic layer 34 .
- the refractive index of the light collection element 36 is greater than that of the anti-reflection layer 40 .
- the width (or thickness) of the light collection element disposed in the pixel far from the central pixel is greater than that of the light collection element disposed in the pixel adjacent to the central pixel.
- the distance between the central point of the pixel and the central point of the light collection element (i.e. the departure distance of the light collection element from the central point of the pixel) in the pixel far from the central pixel is greater than that between the central point of the pixel and the central point of the light collection element in the pixel adjacent to the central pixel.
- the departure direction of the light collection elements is opposite to the pixel-arrangement direction. Also, the departure direction of the light collection elements in the pixels is correspondingly altered in accordance with various pixel-arrangement directions. In addition, the refractive index of the light collection element is higher than that of adjacent materials.
- a QE peak is acknowledged by disposing a light collection element (i.e. a high-refractive-index layer) with a specific dimension in an optical device.
- a light collection element i.e. a high-refractive-index layer
- FIG. 12 the column “A” shows a QE peak (R/G/B) of a WGCF-type optical device without disposing a light collection element therein.
- the column “B” shows a QE peak (R/G/B) of a WGCF-type optical device with a light collection element having a width of 0.3 ⁇ m.
- the column “C” shows a QE peak (R/G/B) of a WGCF-type optical device with a light collection element having a width of 0.7 ⁇ m.
- the QE peak (column “C”) built by the WGCF-type optical device with the wider light collection layer shows that the QE peak of the optical device is a significant improvement of about 1.3% over column “B”, and about 2.0% over column “A”.
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Abstract
Description
- The invention relates to an optical device, and more particularly to an optical device with light collection elements of different dimensions or positions formed above color filters.
- In an optical device with a composite metal grid (CMG)-type structure, a microlens is required above the color filters. In an optical device with a wave guide color filter (WGCF)-type structure, a low-refractive-index material surrounding the color filters is used instead of a microlens to form a wave guide structure.
- However, in an optical device with a wave guide color filter (WGCF)-type structure, due to the absorption of oblique light by metal grids, the quantum effect (QE) of the current pixel drops, especially for pixels located in the peripheral region of the substrate.
- Therefore, development of an optical device with a wave guide color filter (WGCF)-type structure capable of improving the QE spectrum is desirable.
- In accordance with one embodiment of the invention, an optical device is provided. The optical device includes a central region having a plurality of central pixels, a first region having a plurality of first pixels, a second region having a plurality of second pixels, an organic layer formed in the central region, the first region and the second region, a light collection layer surrounded by the organic layer formed in the first region and the second region, a first light collection element of the light collection layer formed in the first pixel, and a second light collection element of the light collection layer formed in the second pixel. The central region, the first region and the second region are spaced from each other along an arrangement direction. The first region is closer to the central region than the second region. The first light collection element is different from the second light collection element.
- In some embodiments, there is a first distance between a center of the first pixel and a center of the first light collection element. There is a second distance between a center of the second pixel and a center of the second light collection element. In some embodiments, the second distance is greater than the first distance. The center of the first light collection element departs from the center of the first pixel along a direction opposite to the arrangement direction of the central region, the first region and the second region. The center of the second light collection element departs from the center of the second pixel along the direction opposite to the arrangement direction of the central region, the first region and the second region.
- In some embodiments, the first distance is the same as the second distance. In some embodiments, the second light collection element has a width which is greater than that of the first light collection element. In some embodiments, the width of the first light collection element is greater than zero. The width of the second light collection element is less than a width of the second pixel. In some embodiments, the second light collection element has an upper surface area which is greater than that of the first light collection element. In some embodiments, the second light collection element has a thickness which is greater than that of the first light collection element. In some embodiments, the thickness of the second light collection element is greater than that of the organic layer. In some embodiments, the first light collection element and the second light collection element are further covered by the organic layer. In some embodiments, a part of the second light collection element extends further into a color filter underneath the second light collection element. In some embodiments, the part of the second light collection element that extends into the color filter has a thickness that is less than one third of that of the color filter.
- In some embodiments, the second light collection element has a width which is greater than that of the first light collection element. The second light collection element has a thickness which is greater than that of the first light collection element. In some embodiments, the second light collection element extends further over a patterned organic layer surrounding a color filter underneath the second light collection element. In some embodiments, the patterned organic layer has a refractive index which is in a range from about 1.2 to about 1.45.
- In some embodiments, the first light collection element and the second light collection element have a refractive index which is greater than those of color filters respectively underneath the first light collection element and the second light collection element. In some embodiments, the first light collection element and the second light collection element have a refractive index which is in a range from about 1.6 to about 1.9. In some embodiments, the optical device further includes an anti-reflection layer formed on the organic layer, the first light collection element and the second light collection element. In some embodiments, the first light collection element and the second light collection element have a refractive index which is greater than that of the anti-reflection layer.
- In the present invention, high-refractive-index (n=1.6-1.9) light collection elements with specific dimensions or positions are disposed above color filters. For the dimension requirement, the width (or thickness) of the light collection element disposed in the pixel far from the central pixel is greater than that of the light collection element disposed in the pixel adjacent to the central pixel. For the position requirement, the distance between the central point of the pixel and the central point of the light collection element (i.e. the departure distance of the light collection element from the central point of the pixel) in the pixel far from the central pixel is greater than that between the central point of the pixel and the central point of the light collection element in the pixel adjacent to the central pixel. Specifically, the departure direction of the light collection elements is opposite to the pixel-arrangement direction. Also, the departure direction of the light collection elements in the pixels is correspondingly altered in accordance with various pixel-arrangement directions. In addition, the refractive index of the light collection element is higher than that of adjacent materials. By disposing the specific light collection element, QE peaks of color filters are thus significantly improved, especially for pixels located in the peripheral region of the substrate.
- A detailed description is given in the following embodiments with reference to the accompanying drawings.
- The present invention can be more fully understood by reading the subsequent detailed description and examples with references made to the accompanying drawings, wherein:
-
FIG. 1 is a top view of pixel arrangement of an optical device in accordance with one embodiment of the invention; -
FIG. 2 is a top view of the pixel structures of an optical device in accordance with one embodiment of the invention; -
FIG. 3 is a cross-sectional view of the pixel structures of an optical device in accordance with one embodiment of the invention; -
FIG. 4 is a top view of the pixel structures of an optical device in accordance with one embodiment of the invention; -
FIG. 5 is a cross-sectional view of the pixel structures of an optical device in accordance with one embodiment of the invention; -
FIG. 6 is a top view of the pixel structures of an optical device in accordance with one embodiment of the invention; -
FIG. 7 is a cross-sectional view of the pixel structures of an optical device in accordance with one embodiment of the invention; -
FIG. 8 is a top view of the pixel structures of an optical device in accordance with one embodiment of the invention; -
FIG. 9 is a cross-sectional view of the pixel structures of an optical device in accordance with one embodiment of the invention; -
FIG. 10 is a top view of the pixel structures of an optical device in accordance with one embodiment of the invention; -
FIG. 11 is a cross-sectional view of the pixel structures of an optical device in accordance with one embodiment of the invention; and -
FIG. 12 shows a QE peak of an optical device in accordance with one embodiment of the invention. - The following description is of the best-contemplated mode of carrying out the invention. This description is made for the purpose of illustrating the general principles of the invention and should not be taken in a limiting sense. The scope of the invention is best determined by reference to the appended claims.
- Referring to
FIGS. 1-3 , in accordance with one embodiment of the invention, anoptical device 10 is provided.FIG. 1 is a top view of pixel arrangement of theoptical device 10.FIG. 2 is a top view of the pixel structures of theoptical device 10.FIG. 3 is a cross-sectional view of the pixel structures of theoptical device 10. - In
FIGS. 1 and 2 , theoptical device 10 includes asubstrate 12 which includes acentral region 14, afirst region 16, asecond region 18 and athird region 20. Thecentral region 14, thefirst region 16, thesecond region 18 and thethird region 20 are spaced from each other. Thefirst region 16 is closer to thecentral region 14 than thesecond region 18. Thesecond region 18 is closer to thefirst region 16 than thethird region 20. Thecentral region 14 has a plurality of central pixels, for example 14 a, 14 b, 14 c and 14 d. Thefirst region 16 has a plurality of first pixels, for example 16 a, 16 b, 16 c and 16 d. Thesecond region 18 has a plurality of second pixels, for example 18 a, 18 b, 18 c and 18 d. Thethird region 20 has a plurality of third pixels, for example 20 a, 20 b, 20 c and 20 d. The central pixels (ex. 14 a, 14 b, 14 c and 14 d) in thecentral region 14, the first pixels (ex. 16 a, 16 b, 16 c and 16 d) in thefirst region 16, the second pixels (ex. 18 a, 18 b, 18 c and 18 d) in thesecond region 18, and the third pixels (ex. 20 a, 20 b, 20 c and 20 d) in thethird region 20 are arranged along a pixel-arrangement direction that is a direction from acenter 12 a towards anedge 12 b of thesubstrate 12, for example, various pixel-arrangement directions (22 a, 22 b, 22 c, 22 d, 22 e, 22 f, 22 g and 22 h), as shown inFIG. 1 . The pixel-arrangement direction 22 a represents the direction in which the pixels are arranged diagonally from the center to the bottom left of thesubstrate 12. The pixel-arrangement direction 22 b represents the direction in which the pixels are arranged horizontally (along x-axis) from the center to the left of thesubstrate 12. The pixel-arrangement direction 22 c represents the direction in which the pixels are arranged diagonally from the center to the top left of thesubstrate 12. The pixel-arrangement direction 22 d represents the direction in which the pixels are arranged perpendicularly (along y-axis) from the center to the top of thesubstrate 12. The pixel-arrangement direction 22 e represents the direction in which the pixels are arranged diagonally from the center to the top right of thesubstrate 12. The pixel-arrangement direction 22 f represents the direction in which the pixels are arranged horizontally (along x-axis) from the center to the right of thesubstrate 12. The pixel-arrangement direction 22 g represents the direction in which the pixels are arranged diagonally from the center to the bottom right of thesubstrate 12. The pixel-arrangement direction 22 h represents the direction in which the pixels are arranged perpendicularly (along y-axis) from the center to the bottom of thesubstrate 12. Here, the arrangement of the central pixels (ex. 14 a, 14 b, 14 c and 14 d), the first pixels (ex. 16 a, 16 b, 16 c and 16 d), the second pixels (ex. 18 a, 18 b, 18 c and 18 d), and the third pixels (ex. 20 a, 20 b, 20 c and 20 d) along the pixel-arrangement direction 22 a is exemplary. - In
FIG. 2 , thecentral pixel 14 a, thefirst pixel 16 a, thesecond pixel 18 a and thethird pixel 20 a include green (G) color filters 22. Thecentral pixel 14 b, thefirst pixel 16 b, thesecond pixel 18 b and thethird pixel 20 b include red (R) color filters 24. Thecentral pixel 14 c, thefirst pixel 16 c, thesecond pixel 18 c and thethird pixel 20 c include blue (B) color filters 26. Thecentral pixel 14 d, thefirst pixel 16 d, thesecond pixel 18 d and thethird pixel 20 d include green (G) color filters 22. In some embodiments, other arrangements of the R/G/B color filters (22, 24 and 26) in the pixels are also suitable in the present invention. Here, thecentral pixel 14 a, thefirst pixel 16 a, thesecond pixel 18 a and thethird pixel 20 a are exemplary for demonstrating various pixel structures thereamong. - Referring to
FIGS. 2 and 3 , thecentral pixel 14 a includes a plurality ofmetal grids 28, a patterned firstorganic layer 30, acolor filter 32, and a secondorganic layer 34. Themetal grids 28 are formed on thesubstrate 12. The patterned firstorganic layer 30 is formed on themetal grids 28. Thecolor filter 32 is surrounded by the patterned firstorganic layer 30. The secondorganic layer 34 is formed on the patterned firstorganic layer 30 and thecolor filter 32. Each of thefirst pixel 16 a, thesecond pixel 18 a and thethird pixel 20 a includes a plurality ofmetal grids 28, a patterned firstorganic layer 30, acolor filter 32, a secondorganic layer 34, and alight collection element 36. Themetal grids 28 are formed on thesubstrate 12. The patterned firstorganic layer 30 is formed on themetal grids 28. Thecolor filter 32 is surrounded by the patterned firstorganic layer 30. The secondorganic layer 34 is formed on the patterned firstorganic layer 30 and thecolor filter 32. Thelight collection element 36 is surrounded by the secondorganic layer 34. Specifically, the refractive index of thelight collection element 36 is greater than that of the secondorganic layer 34. Therefore, no light collection element is disposed in thecentral pixel 14 a. In addition, for thefirst pixel 16 a, thesecond pixel 18 a and thethird pixel 20 a, a first distance “D1” between the central point “Ps” of thefirst pixel 16 a and the central point “PL” of thelight collection element 36 is defined. A second distance “D2” between the central point “Ps” of thesecond pixel 18 a and the central point “PL” of thelight collection element 36 is defined. A third distance “D3” between the central point “Ps” of thethird pixel 20 a and the central point “PL” of thelight collection element 36 is defined. - In
FIGS. 2 and 3 , the first distance “D1”, the second distance “D2” and the third distance “D3” are different thereamong. Referring toFIG. 2 , the central point “PL” of thelight collection element 36 in thefirst pixel 16 a departs from the central point “Ps” of thefirst pixel 16 a along adirection 42. The central point “PL” of thelight collection element 36 in thesecond pixel 18 a departs from the central point “Ps” of thesecond pixel 18 a along thedirection 42. The central point “PL” of thelight collection element 36 in thethird pixel 20 a departs from the central point “Ps” of thethird pixel 20 a along thedirection 42. Specifically, thedeparture direction 42 represents the direction in which the central points “PL” of thelight collection elements 36 depart diagonally from the central points “Ps” towards the top right of thefirst pixel 16 a, thesecond pixel 18 a and thethird pixel 20 a respectively. Here, thecentral pixel 14 a, thefirst pixel 16 a, thesecond pixel 18 a, and thethird pixel 20 a are arranged along the pixel-arrangement direction 22 a (i.e. a direction that the pixels are arranged diagonally from the center to the bottom left of the substrate 12), as shown inFIG. 1 . Therefore, thedeparture direction 42 of thelight collection elements 36 is opposite to the pixel-arrangement direction 22 a. - The
departure direction 42 of thelight collection elements 36 correspondingly alters in accordance with various pixel-arrangement directions to ensure that the departure direction of the light collection element is opposite to the pixel-arrangement direction. In some embodiments, when thecentral pixel 14 a, thefirst pixel 16 a, thesecond pixel 18 a, and thethird pixel 20 a are arranged along the pixel-arrangement direction 22 b (i.e. a direction in which the pixels are arranged horizontally (along x-axis) from the center to the left of the substrate 12), the central points “PL” of thelight collection elements 36 depart horizontally from the central points “Ps” towards the right of thefirst pixel 16 a, thesecond pixel 18 a and thethird pixel 20 a respectively. In some embodiments, when thecentral pixel 14 a, thefirst pixel 16 a, thesecond pixel 18 a, and thethird pixel 20 a are arranged along the pixel-arrangement direction 22 c (i.e. a direction in which the pixels are arranged diagonally from the center to the top left of the substrate 12), the central points “PL” of thelight collection elements 36 depart diagonally from the central points “Ps” towards the bottom right of thefirst pixel 16 a, thesecond pixel 18 a and thethird pixel 20 a respectively. In some embodiments, when thecentral pixel 14 a, thefirst pixel 16 a, thesecond pixel 18 a, and thethird pixel 20 a are arranged along the pixel-arrangement direction 22 d (i.e. a direction in which the pixels are arranged perpendicularly (along y-axis) from the center to the top of the substrate 12), the central points “PL” of thelight collection elements 36 depart perpendicularly from the central points “Ps” towards the bottom of thefirst pixel 16 a, thesecond pixel 18 a and thethird pixel 20 a respectively. In some embodiments, when thecentral pixel 14 a, thefirst pixel 16 a, thesecond pixel 18 a, and thethird pixel 20 a are arranged along the pixel-arrangement direction 22 e (i.e. a direction in which the pixels are arranged diagonally from the center to the top right of the substrate 12), the central points “PL” of thelight collection elements 36 depart diagonally from the central points “Ps” towards the bottom left of thefirst pixel 16 a, thesecond pixel 18 a and thethird pixel 20 a respectively. In some embodiments, when thecentral pixel 14 a, thefirst pixel 16 a, thesecond pixel 18 a, and thethird pixel 20 a are arranged along the pixel-arrangement direction 22 f (i.e. a direction in which the pixels are arranged horizontally (along x-axis) from the center to the right of the substrate 12), the central points “PL” of thelight collection elements 36 depart horizontally from the central points “Ps” towards the left of thefirst pixel 16 a, thesecond pixel 18 a and thethird pixel 20 a respectively. In some embodiments, when thecentral pixel 14 a, thefirst pixel 16 a, thesecond pixel 18 a, and thethird pixel 20 a are arranged along the pixel-arrangement direction 22 g (i.e. a direction in which the pixels are arranged diagonally from the center to the bottom right of the substrate 12), the central points “PL” of thelight collection elements 36 depart diagonally from the central points “Ps” towards the top left of thefirst pixel 16 a, thesecond pixel 18 a and thethird pixel 20 a respectively. In some embodiments, when thecentral pixel 14 a, thefirst pixel 16 a, thesecond pixel 18 a, and thethird pixel 20 a are arranged along the pixel-arrangement direction 22 h (i.e. a direction in which the pixels are arranged perpendicularly (along y-axis) from the center to the bottom of the substrate 12), the central points “PL” of thelight collection elements 36 depart perpendicularly from the central points “Ps” towards the top of thefirst pixel 16 a, thesecond pixel 18 a and thethird pixel 20 a respectively. - In
FIGS. 2 and 3 , the third distance “D3” in thethird pixel 20 a is greater than the second distance “D2” in thesecond pixel 18 a. The second distance “D2” in thesecond pixel 18 a is greater than the first distance “D1” in thefirst pixel 16 a. The first distance “D1” in thefirst pixel 16 a is greater than zero. - In some embodiments, the patterned first
organic layer 30 has a refractive index which is in a range from about 1.2 to about 1.45. In some embodiments, the refractive index of thelight collection element 36 is greater than that of thecolor filter 32. In some embodiments, the refractive index of thelight collection element 36 is in a range from about 1.6 to about 1.9. In some embodiments, each of thecentral pixel 14 a, thefirst pixel 16 a, thesecond pixel 18 a and thethird pixel 20 a further includes anoxide layer 38 which covers themetal grids 28. In some embodiments, each of thecentral pixel 14 a, thefirst pixel 16 a, thesecond pixel 18 a and thethird pixel 20 a further includes ananti-reflection layer 40 formed on the secondorganic layer 34. In some embodiments, the refractive index of thelight collection element 36 is greater than that of theanti-reflection layer 40. - Referring to
FIGS. 1, 4 and 5 , in accordance with another embodiment of the invention, anoptical device 10 is provided.FIG. 4 is a top view of the pixel structures of theoptical device 10.FIG. 5 is a cross-sectional view of the pixel structures of theoptical device 10. - In
FIG. 1 , similarly, the arrangement of the central pixels (ex. 14 a, 14 b, 14 c and 14 d), the first pixels (ex. 16 a, 16 b, 16 c and 16 d), the second pixels (ex. 18 a, 18 b, 18 c and 18 d), and the third pixels (ex. 20 a, 20 b, 20 c and 20 d) along the pixel-arrangement direction 22 a is exemplary. - In
FIG. 4 , thecentral pixel 14 a, thefirst pixel 16 a, thesecond pixel 18 a and thethird pixel 20 a include green (G) color filters 22. Thecentral pixel 14 b, thefirst pixel 16 b, thesecond pixel 18 b and thethird pixel 20 b include red (R) color filters 24. Thecentral pixel 14 c, thefirst pixel 16 c, thesecond pixel 18 c and thethird pixel 20 c include blue (B) color filters 26. Thecentral pixel 14 d, thefirst pixel 16 d, thesecond pixel 18 d and thethird pixel 20 d include green (G) color filters 22. In some embodiments, other arrangements of the R/G/B color filters (22, 24 and 26) in the pixels are also suitable in the present invention. Here, thecentral pixel 14 a, thefirst pixel 16 a, thesecond pixel 18 a and thethird pixel 20 a are exemplary for demonstrating various pixel structures thereamong. - Referring to
FIGS. 4 and 5 , thecentral pixel 14 a includes a plurality ofmetal grids 28, a patterned firstorganic layer 30, acolor filter 32, and a secondorganic layer 34. Themetal grids 28 are formed on thesubstrate 12. The patterned firstorganic layer 30 is formed on themetal grids 28. Thecolor filter 32 is surrounded by the patterned firstorganic layer 30. The secondorganic layer 34 is formed on the patterned firstorganic layer 30 and thecolor filter 32. Each of thefirst pixel 16 a, thesecond pixel 18 a and thethird pixel 20 a includes a plurality ofmetal grids 28, a patterned firstorganic layer 30, acolor filter 32, a secondorganic layer 34, and alight collection element 36. Themetal grids 28 are formed on thesubstrate 12. The patterned firstorganic layer 30 is formed on themetal grids 28. Thecolor filter 32 is surrounded by the patterned firstorganic layer 30. The secondorganic layer 34 is formed on the patterned firstorganic layer 30 and thecolor filter 32. Thelight collection element 36 is surrounded by the secondorganic layer 34. Specifically, the refractive index of thelight collection element 36 is greater than that of the secondorganic layer 34. Therefore, no light collection element is disposed in thecentral pixel 14 a. In addition, for thefirst pixel 16 a, thesecond pixel 18 a and thethird pixel 20 a, a first distance between the central point “Ps” of thefirst pixel 16 a and the central point “PL” of thelight collection element 36 is defined. A second distance between the central point “Ps” of thesecond pixel 18 a and the central point “PL” of thelight collection element 36 is defined. A third distance between the central point “Ps” of thethird pixel 20 a and the central point “PL” of thelight collection element 36 is defined. - In
FIGS. 4 and 5 , the first distance, the second distance and the third distance are zero. Referring toFIG. 4 , the central point “PL” of thelight collection element 36 in thefirst pixel 16 a and the central point “Ps” of thefirst pixel 16 a overlap. The central point “PL” of thelight collection element 36 in thesecond pixel 18 a and the central point “Ps” of thesecond pixel 18 a overlap. The central point “PL” of thelight collection element 36 in thethird pixel 20 a and the central point “Ps” of thethird pixel 20 a overlap. That is, there is no departure of the central points “PL” of thelight collection elements 36 from the central points “Ps” of thefirst pixel 16 a, thesecond pixel 18 a and thethird pixel 20 a respctively. - In
FIGS. 4 and 5 , for thefirst pixel 16 a, thesecond pixel 18 a and thethird pixel 20 a, a first width “W1” of thelight collection element 36 in thefirst pixel 16 a is defined. A second width “W2” of thelight collection element 36 in thesecond pixel 18 a is defined. A third width “W3” of thelight collection element 36 in thethird pixel 20 a is defined. Specifically, the third width “W3” of thelight collection element 36 in thethird pixel 20 a is greater than the second width “W2” of thelight collection element 36 in thesecond pixel 18 a. The second width “W2” of thelight collection element 36 in thesecond pixel 18 a is greater than the first width “W1” of thelight collection element 36 in thefirst pixel 16 a. In some embodiments, the first width “W1” of thelight collection element 36 in thefirst pixel 16 a is greater than zero. The third width “W3” of thelight collection element 36 in thethird pixel 20 a is smaller than the width “W” of thethird pixel 20 a. In addition, a first area “A1” of thelight collection element 36 in thefirst pixel 16 a is defined. A second area “A2” of thelight collection element 36 in thesecond pixel 18 a is defined. A third area “A3” of thelight collection element 36 in thethird pixel 20 a is defined. Similarly, the third area “A3” of thelight collection element 36 in thethird pixel 20 a is greater than the second area “A2” of thelight collection element 36 of thesecond pixel 18 a. The second area “A2” of thelight collection element 36 of thesecond pixel 18 a is greater than the first area “A1” of thelight collection element 36 of thefirst pixel 16 a. - In some embodiments, the patterned first
organic layer 30 has a refractive index which is in a range from about 1.2 to about 1.45. In some embodiments, the refractive index of thelight collection element 36 is greater than that of thecolor filter 32. In some embodiments, the refractive index of thelight collection element 36 is in a range from about 1.6 to about 1.9. In some embodiments, each of thecentral pixel 14 a, thefirst pixel 16 a, thesecond pixel 18 a and thethird pixel 20 a further includes anoxide layer 38 which covers themetal grids 28. In some embodiments, each of thecentral pixel 14 a, thefirst pixel 16 a, thesecond pixel 18 a and thethird pixel 20 a further includes ananti-reflection layer 40 formed on the secondorganic layer 34. In some embodiments, the refractive index of thelight collection element 36 is greater than that of theanti-reflection layer 40. - Referring to
FIGS. 1, 6 and 7 , in accordance with another embodiment of the invention, anoptical device 10 is provided.FIG. 6 is a top view of the pixel structures of theoptical device 10.FIG. 7 is a cross-sectional view of the pixel structures of theoptical device 10. - In
FIG. 1 , similarly, the arrangement of the central pixels (ex. 14 a, 14 b, 14 c and 14 d), the first pixels (ex. 16 a, 16 b, 16 c and 16 d), the second pixels (ex. 18 a, 18 b, 18 c and 18 d), and the third pixels (20 a, 20 b, 20 c and 20 c) along the pixel-arrangement direction 22 a is exemplary. - In
FIG. 6 , thecentral pixel 14 a, thefirst pixel 16 a, thesecond pixel 18 a and thethird pixel 20 a include green (G) color filters 22. Thecentral pixel 14 b, thefirst pixel 16 b, thesecond pixel 18 b and thethird pixel 20 b include red (R) color filters 24. Thecentral pixel 14 c, thefirst pixel 16 c, thesecond pixel 18 c and thethird pixel 20 c include blue (B) color filters 26. Thecentral pixel 14 d, thefirst pixel 16 d, thesecond pixel 18 d and thethird pixel 20 d include green (G) color filters 22. In some embodiments, other arrangements of the R/G/B color filters (22, 24 and 26) in the pixels are also suitable in the present invention. Here, thecentral pixel 14 a, thefirst pixel 16 a, thesecond pixel 18 a and thethird pixel 20 a are exemplary for demonstrating various subpixel structures thereamong. - Referring to
FIGS. 6 and 7 , thecentral pixel 14 a includes a plurality ofmetal grids 28, a patterned firstorganic layer 30, acolor filter 32, and a secondorganic layer 34. Themetal grids 28 are formed on thesubstrate 12. The patterned firstorganic layer 30 is formed on themetal grids 28. Thecolor filter 32 is surrounded by the patterned firstorganic layer 30. The secondorganic layer 34 is formed on the patterned firstorganic layer 30 and thecolor filter 32. Each of thefirst pixel 16 a, thesecond pixel 18 a and thethird pixel 20 a includes a plurality ofmetal grids 28, a patterned firstorganic layer 30, acolor filter 32, a secondorganic layer 34, and alight collection element 36. Themetal grids 28 are formed on thesubstrate 12. The patterned firstorganic layer 30 is formed on themetal grids 28. Thecolor filter 32 is surrounded by the patterned firstorganic layer 30. The secondorganic layer 34 is formed on the patterned firstorganic layer 30 and thecolor filter 32. Thelight collection element 36 is surrounded by the secondorganic layer 34. Specifically, the refractive index of thelight collection element 36 is greater than that of the secondorganic layer 34. Therefore, no light collection element is disposed in thecentral pixel 14 a. In addition, for thefirst pixel 16 a, thesecond pixel 18 a and thethird pixel 20 a, a first distance between the central point “Ps” of thefirst pixel 16 a and the central point “PL” of thelight collection element 36 is defined. A second distance between the central point “Ps” of thesecond pixel 18 a and the central point “PL” of thelight collection element 36 is defined. A third distance between the central point “Ps” of thethird pixel 20 a and the central point “PL” of thelight collection element 36 is defined. - In
FIGS. 6 and 7 , the first distance, the second distance and the third distance are zero. Referring toFIG. 6 , the central point “PL” of thelight collection element 36 in thefirst pixel 16 a and the central point “Ps” of thefirst pixel 16 a overlap. The central point “PL” of thelight collection element 36 in thesecond pixel 18 a and the central point “Ps” of thesecond pixel 18 a overlap. The central point “PL” of thelight collection element 36 in thethird pixel 20 a and the central point “Ps” of thethird pixel 20 a overlap. That is, there is no departure of the central points “PL” of thelight collection elements 36 from the central points “Ps” of thefirst pixel 16 a, thesecond pixel 18 a and thethird pixel 20 a respectively. - In
FIG. 7 , for thefirst pixel 16 a, thesecond pixel 18 a and thethird pixel 20 a, the first thickness “T1” of thelight collection element 36 in thefirst pixel 16 a is defined. The second thickness “T2” of thelight collection element 36 in thesecond pixel 18 a is defined. The third thickness “T3” of thelight collection element 36 in thethird pixel 20 a is defined. Specifically, the third thickness “T3” of thelight collection element 36 in thethird pixel 20 a is greater than the second thickness “T2” of thelight collection element 36 in thesecond pixel 18 a. The second thickness “T2” of thelight collection element 36 in thesecond pixel 18 a is greater than the first thickness “T1” of thelight collection element 36 in thefirst pixel 16 a. InFIG. 7 , the second thickness “T2” of thelight collection element 36 in thesecond pixel 18 a is greater than the thickness “TL” of the secondorganic layer 34. In some embodiments, thelight collection elements 36 respectively in thefirst pixel 16 a, thesecond pixel 18 a and thethird pixel 20 a are further covered by the second organic layer 34 (not shown). - In some embodiments, the patterned first
organic layer 30 has a refractive index which is in a range from about 1.2 to about 1.45. In some embodiments, the refractive index of thelight collection element 36 is greater than that of thecolor filter 32. In some embodiments, the refractive index of thelight collection element 36 is in a range from about 1.6 to about 1.9. In some embodiments, each of thecentral pixel 14 a, thefirst pixel 16 a, thesecond pixel 18 a and thethird pixel 20 a further includes anoxide layer 38 which covers themetal grids 28. In some embodiments, each of thecentral pixel 14 a, thefirst pixel 16 a, thesecond pixel 18 a and thethird pixel 20 a further includes ananti-reflection layer 40 formed on the secondorganic layer 34. In some embodiments, the refractive index of thelight collection element 36 is greater than that of theanti-reflection layer 40. - Referring to
FIGS. 1, 8 and 9 , in accordance with another embodiment of the invention, anoptical device 10 is provided.FIG. 8 is a top view of the pixel structures of theoptical device 10.FIG. 9 is a cross-sectional view of the pixel structures of theoptical device 10. - In
FIG. 1 , similarly, the arrangement of the central pixels (ex. 14 a, 14 b, 14 c and 14 d), the first pixels (ex. 16 a, 16 b, 16 c and 16 d), the second pixels (ex. 18 a, 18 b, 18 c and 18 d), and the third pixels (ex. 20 a, 20 b, 20 c and 20 d) along the pixel-arrangement direction 22 a is exemplary. - In
FIG. 8 , thecentral pixel 14 a, thefirst pixel 16 a, thesecond pixel 18 a and thethird pixel 20 a include green (G) color filters 22. Thecentral pixel 14 b, thefirst pixel 16 b, thesecond pixel 18 b and thethird pixel 20 b include red (R) color filters 24. Thecentral pixel 14 c, thefirst pixel 16 c, thesecond pixel 18 c and thethird pixel 20 c include blue (B) color filters 26. Thecentral pixel 14 d, thefirst pixel 16 d, thesecond pixel 18 d and thethird pixel 20 d include green (G) color filters 22. In some embodiments, other arrangements of the R/G/B color filters (22, 24 and 26) in the pixels are also suitable in the present invention. Here, thecentral pixel 14 a, thefirst pixel 16 a, thesecond pixel 18 a and thethird pixel 20 a are exemplary for demonstrating various subpixel structures thereamong. - Referring to
FIGS. 8 and 9 , thecentral pixel 14 a includes a plurality ofmetal grids 28, a patterned firstorganic layer 30, acolor filter 32, and a secondorganic layer 34. Themetal grids 28 are formed on thesubstrate 12. The patterned firstorganic layer 30 is formed on themetal grids 28. Thecolor filter 32 is surrounded by the patterned firstorganic layer 30. The secondorganic layer 34 is formed on the patterned firstorganic layer 30 and thecolor filter 32. Each of thefirst pixel 16 a, thesecond pixel 18 a and thethird pixel 20 a includes a plurality ofmetal grids 28, a patterned firstorganic layer 30, acolor filter 32, a secondorganic layer 34, and alight collection element 36. Themetal grids 28 are formed on thesubstrate 12. The patterned firstorganic layer 30 is formed on themetal grids 28. Thecolor filter 32 is surrounded by the patterned firstorganic layer 30. The secondorganic layer 34 is formed on the patterned firstorganic layer 30 and thecolor filter 32. Thelight collection element 36 is surrounded by the secondorganic layer 34. Specifically, the refractive index of thelight collection element 36 is greater than that of the secondorganic layer 34. Therefore, no light collection element is disposed in thecentral pixel 14 a. In addition, for thefirst pixel 16 a, thesecond pixel 18 a and thethird pixel 20 a, a first distance between the central point “Ps” of thefirst pixel 16 a and the central point “PL” of thelight collection element 36 is defined. A second distance between the central point “Ps” of thesecond pixel 18 a and the central point “PL” of thelight collection element 36 is defined. A third distance between the central point “Ps” of thethird pixel 20 a and the central point “PL” of thelight collection element 36 is defined. - In
FIGS. 8 and 9 , the first distance, the second distance and the third distance are zero. Referring toFIG. 8 , the central point “PL” of thelight collection element 36 in thefirst pixel 16 a and the central point “Ps” of thefirst pixel 16 a overlap. The central point “PL” of thelight collection element 36 in thesecond pixel 18 a and the central point “Ps” of thesecond pixel 18 a overlap. The central point “PL” of thelight collection element 36 in thethird pixel 20 a and the central point “Ps” of thethird pixel 20 a overlap. That is, there is no departure of the central points “PL” of thelight collection elements 36 from the central points “Ps” of thefirst pixel 16 a, thesecond pixel 18 a and thethird pixel 20 a respectively. - In
FIG. 9 , a part of thelight collection element 36 in thesecond pixel 18 a extends further into thecolor filter 32. Also, a part of thelight collection element 36 in thethird pixel 20 a extends further into thecolor filter 32. For thefirst pixel 16 a, thesecond pixel 18 a and thethird pixel 20 a, the first thickness “T1” of thelight collection element 36 in thefirst pixel 16 a is defined. The second thickness “T2” of thelight collection element 36 in thesecond pixel 18 a is defined. The third thickness “T3” of thelight collection element 36 in thethird pixel 20 a is defined. Specifically, the third thickness “T3” of thelight collection element 36 in thethird pixel 20 a is greater than the second thickness “T2” of thelight collection element 36 in thesecond pixel 18 a. The second thickness “T2” of thelight collection element 36 in thesecond pixel 18 a is greater than the first thickness “T1” of thelight collection element 36 in thefirst pixel 16 a. In some embodiments, the thickness “T3 L” of the part of thelight collection element 36 that extends into thecolor filter 32 is less than one third of the thickness “TCF” of thecolor filter 32. - In some embodiments, the patterned first
organic layer 30 has a refractive index which is in a range from about 1.2 to about 1.45. In some embodiments, the refractive index of thelight collection element 36 is greater than that of thecolor filter 32. In some embodiments, the refractive index of thelight collection element 36 is in a range from about 1.6 to about 1.9. In some embodiments, each of thecentral pixel 14 a, thefirst pixel 16 a, thesecond pixel 18 a and thethird pixel 20 a further includes anoxide layer 38 which covers themetal grids 28. In some embodiments, each of thecentral pixel 14 a, thefirst pixel 16 a, thesecond pixel 18 a and thethird pixel 20 a further includes ananti-reflection layer 40 formed on the secondorganic layer 34. In some embodiments, the refractive index of thelight collection element 36 is greater than that of theanti-reflection layer 40. - Referring to
FIGS. 1, 10 and 11 , in accordance with another embodiment of the invention, anoptical device 10 is provided.FIG. 10 is a top view of the pixel structures of theoptical device 10.FIG. 11 is a cross-sectional view of the pixel structures of theoptical device 10. - In
FIG. 1 , similarly, the arrangement of the central pixels (ex. 14 a, 14 b, 14 c and 14 d), the first pixels (ex. 16 a, 16 b, 16 c and 16 d), the second pixels (ex. 18 a, 18 b, 18 c and 18 d), and the third pixels (ex. 20 a, 20 b, 20 c and 20 d) along the pixel-arrangement direction 22 a is exemplary. - In
FIG. 10 , thecentral pixel 14 a, thefirst pixel 16 a, thesecond pixel 18 a and thethird pixel 20 a include green (G) color filters 22. Thecentral pixel 14 b, thefirst pixel 16 b, thesecond pixel 18 b and thethird pixel 20 b include red (R) color filters 24. Thecentral pixel 14 c, thefirst pixel 16 c, thesecond pixel 18 c and thethird pixel 20 c include blue (B) color filters 26. Thecentral pixel 14 d, thefirst pixel 16 d, thesecond pixel 18 d and thethird pixel 20 d include green (G) color filters 22. In some embodiments, other arrangements of the R/G/B color filters (22, 24 and 26) in the pixels are also suitable in the present invention. Here, thecentral pixel 14 a, thefirst pixel 16 a, thesecond pixel 18 a and thethird pixel 20 a are exemplary for demonstrating various subpixel structures thereamong. - Referring to
FIGS. 10 and 11 , thecentral pixel 14 a includes a plurality ofmetal grids 28, a patterned firstorganic layer 30, acolor filter 32, and a secondorganic layer 34. Themetal grids 28 are formed on thesubstrate 12. The patterned firstorganic layer 30 is formed on themetal grids 28. Thecolor filter 32 is surrounded by the patterned firstorganic layer 30. The secondorganic layer 34 is formed on the patterned firstorganic layer 30 and thecolor filter 32. Each of thefirst pixel 16 a, thesecond pixel 18 a and thethird pixel 20 a includes a plurality ofmetal grids 28, a patterned firstorganic layer 30, acolor filter 32, a secondorganic layer 34, and alight collection element 36. Themetal grids 28 are formed on thesubstrate 12. The patterned firstorganic layer 30 is formed on themetal grids 28. Thecolor filter 32 is surrounded by the patterned firstorganic layer 30. The secondorganic layer 34 is formed on the patterned firstorganic layer 30 and thecolor filter 32. Thelight collection element 36 is surrounded by the secondorganic layer 34. Specifically, the refractive index of thelight collection element 36 is greater than that of the secondorganic layer 34. Therefore, no light collection element is disposed in thecentral pixel 14 a. In addition, for thefirst pixel 16 a, thesecond pixel 18 a and thethird pixel 20 a, a first distance “D1” between the central point “Ps” of thefirst pixel 16 a and the central point “PL” of thelight collection element 36 is defined. A second distance “D2” between the central point “Ps” of thesecond pixel 18 a and the central point “PL” of thelight collection element 36 is defined. A third distance “D3” between the central point “Ps” of thethird pixel 20 a and the central point “PL” of thelight collection element 36 is defined. - In
FIGS. 10 and 11 , the first distance “D1”, the second distance “D2” and the third distance “D3” are different thereamong. Referring toFIG. 10 , the central point “PL” of thelight collection element 36 in thefirst pixel 16 a departs from the central point “Ps” of thefirst pixel 16 a along adirection 42. The central point “PL” of thelight collection element 36 in thesecond pixel 18 a departs from the central point “Ps” of thesecond pixel 18 a along thedirection 42. The central point “PL” of thelight collection element 36 in thethird pixel 20 a departs from the central point “Ps” of thethird pixel 20 a along thedirection 42. Specifically, thedeparture direction 42 represents the direction in which the central points “PL” of thelight collection elements 36 depart diagonally from the central points “Ps” to the top right of thefirst pixel 16 a, thesecond pixel 18 a and thethird pixel 20 a respectively. Here, thecentral pixel 14 a, thefirst pixel 16 a, thesecond pixel 18 a, and thethird pixel 20 a are arranged along the pixel-arrangement direction 22 a (i.e. a direction that the pixels are arranged diagonally from the center to the bottom left of the substrate 12), as shown inFIG. 1 . Therefore, thedirection 42 is opposite to the pixel-arrangement direction 22 a. InFIGS. 10 and 11 , the third distance “D3” in thethird pixel 20 a is greater than the second distance “D2” in thesecond pixel 18 a. The second distance “D2” in thesecond pixel 18 a is greater than the first distance “D1” in thefirst pixel 16 a. The first distance “D1” in thefirst pixel 16 a is greater than zero. - In
FIGS. 10 and 11 , for thefirst pixel 16 a, thesecond pixel 18 a and thethird pixel 20 a, a first width “W1” of thelight collection element 36 in thefirst pixel 16 a is defined. A second width “W2” of thelight collection element 36 in thesecond pixel 18 a is defined. A third width “W3” of thelight collection element 36 in thethird pixel 20 a is defined. Specifically, the third width “W3” of thelight collection element 36 in thethird pixel 20 a is greater than the second width “W2” of thelight collection element 36 in thesecond pixel 18 a. The second width “W2” of thelight collection element 36 in thesecond pixel 18 a is greater than the first width “W1” of thelight collection element 36 in thefirst pixel 16 a. In some embodiments, the first width “W1” of thelight collection element 36 in thefirst pixel 16 a is greater than zero. The third width “W3” of thelight collection element 36 in thethird pixel 20 a is smaller than the width “W” of thethird pixel 20 a. Thelight collection element 36 in thethird pixel 20 a extends further over the patterned firstorganic layer 30, as shown inFIG. 11 . In addition, a first area “A1” of thelight collection element 36 in thefirst pixel 16 a is defined. A second area “A2” of thelight collection element 36 in thesecond pixel 18 a is defined. A third area “A3” of thelight collection element 36 in thethird pixel 20 a is defined. Similarly, the third area “A3” of thelight collection element 36 in thethird pixel 20 a is greater than the second area “A2” of thelight collection element 36 in thesecond pixel 18 a. The second area “A2” of thelight collection element 36 in thesecond pixel 18 a is greater than the first area “A1” of thelight collection element 36 in thefirst pixel 16 a. - In
FIG. 11 , for thefirst pixel 16 a, thesecond pixel 18 a and thethird pixel 20 a, the first thickness “T1” of thelight collection element 36 in thefirst pixel 16 a is defined. The second thickness “T2” of thelight collection element 36 in thesecond pixel 18 a is defined. The third thickness “T3” of thelight collection element 36 in thethird pixel 20 a is defined. Specifically, the third thickness “T3” of thelight collection element 36 in thethird pixel 20 a is greater than the second thickness “T2” of thelight collection element 36 in thesecond pixel 18 a. The second thickness “T2” of thelight collection element 36 in thesecond pixel 18 a is greater than the first thickness “T1” of thelight collection element 36 in thefirst pixel 16 a. InFIG. 11 , the second thickness “T2” of thelight collection element 36 in thesecond pixel 18 a is greater than the thickness “TL” of the secondorganic layer 34. In some embodiments, thelight collection elements 36 respectively in thefirst pixel 16 a, thesecond pixel 18 a and thethird pixel 20 a are further covered by the second organic layer 34 (not shown). - In some embodiments, the patterned first
organic layer 30 has a refractive index which is in a range from about 1.2 to about 1.45. In some embodiments, the refractive index of thelight collection element 36 is greater than that of thecolor filter 32. In some embodiments, the refractive index of thelight collection element 36 is in a range from about 1.6 to about 1.9. In some embodiments, each of thecentral pixel 14 a, thefirst pixel 16 a, thesecond pixel 18 a and thethird pixel 20 a further includes anoxide layer 38 which covers themetal grids 28. In some embodiments, each of thecentral pixel 14 a, thefirst pixel 16 a, thesecond pixel 18 a and thethird pixel 20 a further includes ananti-reflection layer 40 formed on the secondorganic layer 34. In some embodiments, the refractive index of thelight collection element 36 is greater than that of theanti-reflection layer 40. - In the present invention, high-refractive-index (n=1.6-1.9) light collection elements with specific dimensions or positions are disposed above color filters. For the dimension requirement, the width (or thickness) of the light collection element disposed in the pixel far from the central pixel is greater than that of the light collection element disposed in the pixel adjacent to the central pixel. For the position requirement, the distance between the central point of the pixel and the central point of the light collection element (i.e. the departure distance of the light collection element from the central point of the pixel) in the pixel far from the central pixel is greater than that between the central point of the pixel and the central point of the light collection element in the pixel adjacent to the central pixel. Specifically, the departure direction of the light collection elements is opposite to the pixel-arrangement direction. Also, the departure direction of the light collection elements in the pixels is correspondingly altered in accordance with various pixel-arrangement directions. In addition, the refractive index of the light collection element is higher than that of adjacent materials. By disposing the specific light collection element, QE peaks of color filters are thus significantly improved, especially for pixels located in the peripheral region of the substrate.
- QE Peak Improvement of the Optical Device
- In this example, improvement of a QE peak, especially for pixels located in the peripheral region of the substrate, is acknowledged by disposing a light collection element (i.e. a high-refractive-index layer) with a specific dimension in an optical device. Referring to
FIG. 12 , the column “A” shows a QE peak (R/G/B) of a WGCF-type optical device without disposing a light collection element therein. The column “B” shows a QE peak (R/G/B) of a WGCF-type optical device with a light collection element having a width of 0.3 μm. The column “C” shows a QE peak (R/G/B) of a WGCF-type optical device with a light collection element having a width of 0.7 μm. The QE peak (column “C”) built by the WGCF-type optical device with the wider light collection layer shows that the QE peak of the optical device is a significant improvement of about 1.3% over column “B”, and about 2.0% over column “A”. - While the invention has been described by way of example and in terms of preferred embodiment, it should be understood that the invention is not limited thereto. On the contrary, it is intended to cover various modifications and similar arrangements (as would be apparent to those skilled in the art). Therefore, the scope of the appended claims should be accorded the broadest interpretation so as to encompass all such modifications and similar arrangements.
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