Systems and methods for lighting an e-paper display
A method includes determining a first amount of equivalent melanopic lux (EML) based on an actual time of day or an intended time of day, providing, via one or more sources, light configured to emit a first set of spectra that causes the first amount of EML and providing a light guide configured to receive and reflect the light toward an electronic paper (e-paper) display, the light guide being in front of the e-paper display in relation to the reader.
1 . A method for impacting biological activity of a reader, comprising:
determining a first amount of equivalent melanopic lux (EML) based on an actual time of day or an intended time of day;
causing one or more first light sources to emit a first light having said first amount of EML to illuminate an electronic paper (e-paper) display;
causing one or more long red and near infrared energy (LRNE) light sources to emit LRNE light from said e-paper display, said LRNE light being at least one of long red light or near infrared (NIR) light.
2 . The method of claim 1 , wherein primary light is emitted from said e-paper display using a light guide to reflect said primary light, said light guide being in front of said e-paper display.
3 . The method of claim 1 , wherein said primary light is a white light.
4 . The method of claim 3 , wherein said one or more LRNE light sources are integral to one or more primary light sources for providing a red component in said white light.
5 . The method of claim 1 , wherein said one or more LRNE light sources are independent of said one or more primary light sources.
6 . The method of claim 1 , wherein said long red light ranges from 625 nm to 700 nm, and NIR light ranges from 700 nm to 1400 nm.
7 . The method of claim 1 , wherein said long red light has a peak wavelength 640-670 nm.
8 . The method of claim 1 , wherein said NIR light has a peak wavelength 850 nm, 940 nm, or 1064 nm.
9 . The method of claim 1 , wherein said one or more LRNE light sources emit both long red light and NIR light.
10 . The method of claim 1 , wherein said long red light and NIR light provide at least one of visible LRNE and non-visible LRNE.
11 . The method of claim 10 , wherein said visible LRNE is light having spectral power in wavelengths between about 625 nm and about 700 nm, and said non-visible LRNE is light having spectral power in wavelengths greater than or equal to about 700 nm.
12 . The method of claim 1 , wherein one or more primary light sources comprise at least a first channel comprising two different first light sources configured to emit a first combined light having said first equivalent melanopic lux (EML) and a second channel comprising two different second light sources configured to emit a second combined light having a second EML, wherein said second EML is greater than said first EML.
13 . The method of claim 12 , wherein said first and second combined light have the same color point.
14 . The method of claim 12 , wherein said first and second channels are configured to operate in one or two modes, a low EML mode in which said first channel is powered and said second channel is turned off, and a high EML mode in which said second channel is powered and said first channel is turned off.
15 . The method of claim 12 , wherein said first and second levels of EML is further determined based on, at least in part, time of year.
16 . A method for impacting biological activity of a reader, comprising:
determining a first amount of equivalent melanopic lux (EML) based on an actual time of day or an intended time of day;
causing one or more primary light sources to emit a primary light having said first amount of EML to illuminate an electronic paper (e-paper) display;
wherein said primary light sources emits said first light in pulses; and
causing one or more long red and near infrared energy (LRNE) light sources to emit LRNE light from said e-paper display, said LRNE light being at least one of long red light or near infrared (NIR) light.
17 . The method of claim 16 , wherein each of said pulses has a duration less than 0.1 second.
18 . The method of claim 16 , wherein said primary light is a white light.
19 . The method of claim 18 , wherein said one or more LRNE light sources are integral to one or more primary light sources for providing a red component in said white light.