| 摘要 |
Disclosed are a diffraction-type optical modulator and a display apparatus including the same. The diffraction-type optical modulator includes: a board; a lower mirror formed on the board; an upper mirror located apart from the lower mirror by a predetermined gap, having a hole, separated into at least two ridges by the hole, and movable up and down; and, an actuator moving the upper mirror in accordance with a driving signal and changing the separation distance, whereas a part of incident light beam reflects from the upper mirror, the rest of the incident light beam passes through the hole and reflects from the lower mirror, and then passes through the hole. A contrast ratio can be maximized by using the relation between the width of the hole and the ridge of an upper mirror, the ridge being measured in parallel with the direction of distribution of diffraction gratings.
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