Display apparatus capable of controlling light transmittance

摘要

The invention relates to a display apparatus (400) having a transparent display device (10) for emitting an image. In order to change the transparency of the display apparatus (400), the transparent display device (10) is arranged between a first and a second optical element, wherein the first and the second optical elements are adapted to polarize light and the second optical element comprises a first and a second phase delay region (421, 422), which differently delay phases of light and are moveably provided with respect to the transparent display device (10).