  An optical teardown, or reverse engineering, of an Amazon Kindle Paperwhite
electrophoretic display was performed by Optical Coherence Tomography at 1060
nm. The display incorporates an optical diffuser, lightguide and scattering
layers for white light illumination, capacitive touch sensing, and an
electrophoretic display. All these layers can be imaged by OCT as well as the
thin film transistor array on the back side for driving the pixels. Phase
sensitive OCT is used to measure motion of the pigment particles as the display
changes between black and white.
