A display apparatus, comprising: a transparent display panel having a plurality of subpixels; and an array of a plurality of micro light modulators on the display panel and configured to adaptively modulate display contrast of the display apparatus; wherein each of the plurality of micro light modulators is configured to adaptively modulate a light intensity of light emitted out of a light emitting side of the display panel in a region corresponding to each of the plurality of micro light modulators based on a luminance level of a current image displayed in the region; the display panel has a first side distal to the array of the plurality of micro light modulators, and a second side opposite to the first side and proximal to the array of the plurality of micro light modulators; each of the plurality of micro light modulators is configured to adaptively modulate a first light intensity of first light by reflecting a first portion (L2-1) of second light toward the second side thereby increasing the first light intensity; each of the plurality of micro light modulators comprises a micro mirror; the micro mirror has a reflective surface at a first angle with respect to a surface of the second side of the display panel; the reflective surface is configured to reflect a first portion (L2-1) of the second light toward the second side and the second portion (L2-2) of the second light along a direction away from the second side; and the display apparatus further comprises an adaptive control circuit configured to control the first angle to adaptively adjust a ratio of the first portion (L2-1) to the second portion (L2-2) in response to a change in the second light intensity thereby adaptively modulating the first light intensity based on the second light intensity. a transparent display panel having a plurality of subpixels; and an array of a plurality of micro light modulators on the display panel and configured to adaptively modulate display contrast of the display apparatus; wherein each of the plurality of micro light modulators is configured to adaptively modulate a light intensity of light emitted out of a light emitting side of the display panel in a region corresponding to each of the plurality of micro light modulators based on a luminance level of a current image displayed in the region; the display panel has a first side distal to the array of the plurality of micro light modulators, and a second side opposite to the first side and proximal to the array of the plurality of micro light modulators; each of the plurality of micro light modulators is configured to adaptively modulate a first light intensity of first light by reflecting a first portion (L2-1) of second light toward the second side thereby increasing the first light intensity; each of the plurality of micro light modulators comprises a micro mirror; the micro mirror has a reflective surface at a first angle with respect to a surface of the second side of the display panel; the reflective surface is configured to reflect a first portion (L2-1) of the second light toward the second side and the second portion (L2-2) of the second light along a direction away from the second side; and the display apparatus further comprises an adaptive control circuit configured to control the first angle to adaptively adjust a ratio of the first portion (L2-1) to the second portion (L2-2) in response to a change in the second light intensity thereby adaptively modulating the first light intensity based on the second light intensity.