Switchable optical filter apparatus with light
An apparatus comprising a switchable optical filter comprising a layer of switchable material, the switchable material comprising a photochromic/thermochromic, a photochromic/photochromic, or a photochromic/electrochromic compound; a first light source providing light of a wavelength that causes the switchable material to transition from a faded state to a dark state, or a dark state to a faded state; and a switch for controlling activation of the first light source.
1. An apparatus comprising:
a. a switchable optical filter comprising a layer of switchable material, the switchable material comprising:
i. a compound according to Formula IA/B that is reversibly convertible between a ring-open isomer A and a ring-closed isomer B:
ii. a compound according to Formula IIA/B that is reversibly convertible between a ring-open isomer A and a ring-closed isomer B:
or
iii. a compound according to Formula IA/B and a compound according to Formula IIA/B;
b. a first light source providing light of a wavelength that causes the switchable material to transition from a first state to a second state, or the second state to the first state, the first state having a greater light transmittance than the second state; and
c. a switch for controlling activation of the first light source.
2. The apparatus of claim 1 , wherein the first light source provides light with a wavelength of less than about 450 nm or from about 350 to about 420 nm.
3. The apparatus of claim 1 wherein the first light source provides light that causes the switchable material to transition from the first state to the second state.
4. The apparatus of claim 1 , further comprising one or more UV blocking layers, a light dispersing layer, or one or more UV blocking layers and a light dispersing layer.
5. The apparatus of claim 1 , further comprising a second light source.
6. The apparatus of claim 5 wherein the second light source causes the switchable material to transition from the second state to the first state.
7. The apparatus of claim 5 wherein the second light source provides light with a wavelength of from about 450 nm to about 650 nm, or light with a wavelength of from about 575 to about 650 nm.
8. The apparatus of claim 1 wherein the switchable optical filter is transitionable from the first state to the second state with application of 350 to 420 nm light, and transitionable from the second state to the first state with application of 450 to 650 nm light, or light with a wavelength of from about 575 to about 650 nm, or electricity.
9. The apparatus of claim 1 wherein the switching material is transitionable from the first state to the second state, and wherein the second state has 1% or less of light transmittance with application of UV light.
10. The apparatus of claim 1 , wherein the first light source is adjacent to one or more edges of the switchable optical filter.
11. The apparatus of claim 1 wherein the first light source is adjacent to one or more surfaces of the switchable optical filter.
12. A display apparatus comprising:
a. a display; and
b. a switchable optical filter comprising a switchable material, the switchable material comprising
i. a compound according to Formula IA/B that is reversibly convertible between a ring-open isomer A and a ring-closed isomer B:
ii. a compound according to Formula IIA/B that is reversibly convertible between a ring-open isomer A and a ring-closed isomer B:
or
iii. a compound according to Formula IA/B and a compound according to Formula IIA/B.
13. The display apparatus of claim 12 , further comprising a first light source and optionally a second light source, the first and optional second light sources providing light of a wavelength that causes the switchable material to transition from a first state to a second state, or the second state to the first state, the first state having a greater light transmittance than the second state.
14. The display apparatus of claim 13 wherein the first light source, the second light source, or the first and the second light sources are located at a periphery of the optical filter.
15. The display apparatus of claim 13 wherein the first light source, the second light source or the first and the second light sources are on a plane parallel or substantially parallel to the display.
16. The display apparatus of claim 13 wherein the first light source, the second light source, or the first and the second light sources are offset from the plane of the display, the plane of the switchable optical filter, or the plane of the display and the plane of the switchable optical filter.
17. The display apparatus of claim 13 wherein the first light source provides light with a wavelength of less than about 450 nm, or from about 350 to about 420 nm, and the second light source provides light with a wavelength of from about 450 nm to about 650 nm, or light with a wavelength of from about 575 to about 650 nm.
18. The display apparatus of claim 12 further comprising a light dispersing layer, a UV blocking layer, or a light dispersing layer and a UV blocking layer.
19. The display apparatus of claim 12 wherein the switchable optical filter is spaced apart from a surface of the display.