Multi-state IMOD with RGB absorbers

摘要

A display apparatus may include a multi-state IMOD, such as an analog IMOD (AIMOD), a 3-state IMOD (such as having a white state, a black state and one colored state) or a 5-state IMOD (such as having a white state, a black state and three colored states). The multi-state IMOD may include a movable reflective layer and an absorber stack. The absorber stack may include a first absorber layer having a first absorption coefficient and a first absorption peak at a first wavelength, a second absorber layer having a second absorption coefficient and a second absorption peak at a second wavelength, and a third absorber layer having a third absorption coefficient and a third absorption peak at a third wavelength. The first, second and third absorption layers may have absorption levels that drop to nearly zero at the center of each neighboring absorber layer's absorption peak.

主权项

1. A multi-state interferometric modulator (IMOD), comprising:
a movable reflective layer; and an absorber layer stack including a first absorber layer having a first absorption coefficient and a first absorption peak at a first wavelength of light, a second absorber layer having a second absorption coefficient and a second absorption peak at a second wavelength of light, and a third absorber layer having a third absorption coefficient and a third absorption peak at a third wavelength of light, wherein the first, second and third absorption layers have absorption levels that drop to nearly zero at the center of at least one neighboring absorber layer's absorption peak, wherein: the movable reflective layer and the absorber layer stack define a single, variable-sized gap therebetween, the size of the gap corresponding with a color of light reflected by the multi-state IMOD; the first absorber layer is disposed at a first position, within the absorber layer stack, corresponding to a null for the first wavelength of light that coincides with the first absorption peak; the second absorber layer is disposed at a second position, within the absorber layer stack, corresponding to a null for the second wavelength of light that coincides with the second absorption peak; the third absorber layer is disposed at a third position, within the absorber layer stack, corresponding to a null for the third wavelength of light that coincides with the third absorption peak, the nulls for the first, second and third wavelengths of light corresponding to a resulting interference standing wave field intensity distribution when the gap corresponds to a white state of the multi-state IMOD.