Salta al contenuto principale

Modifiche al passo #17

Modifica in base a Jake Devincenzi-

In attesa di approvazione

Prima di
Dopo il
Invariato

Righe Passo

[* black] The glass over the E-ink screen takes the light from the eight LEDs at the top and evenly distributes it.
[* black] How you ask?
[* black] Optics. The glass is specially design using to principles of optics: internal reflection and diffraction.
[* black] Light coming from the LEDs goes into the glass, which has a [http://en.wikipedia.org/wiki/Diffraction_grating|diffraction grating] on it. This diffraction grating bounces the light around using internal reflection. Barnes and Noble really did their homework on this one, because instead of a simple linear diffraction grating, the diffraction grating seems to change throughout the glass to compensate for the local conditions.
[* black] How do we know its a diffraction grating?
- [* black] Lasers. We took a laser and pointed it at the glass. Unlike the light of the white LEDs found on the nook, the laser has a very limited wavelength, so when you shine it through the glass you see a diffraction pattern.
+ [* black] [http://shaktronics.com/files/2010/02/big-scary-laser.gif|Lasers]. We took a laser and pointed it at the glass. Unlike the light of the white LEDs found on the nook, the laser has a very limited wavelength, so when you shine it through the glass you see a diffraction pattern.