A wearable display apparatus comprising: a reflective light modulator having a front, a plurality of monochromatic light sources (112A, 112B, 112C, 162A, 162B, 162C) of different colors, the monochromatic light sources (112A, 112B, 112C) being operable to emit light of the different colors in a sequential manner, and a light guide plate placed at the front of the light modulator, the light guide plate having a first and a second major surface (122, 124) opposite to each other, and a light incidence surface connected with the first and second major surfaces (122, 124), characterized in that: the light guide plate is configured to direct light received at the light incidence surface through the first major surface toward the light modulator for modulation, and to receive an image light outputted from the light modulator at the first major surface and transmit the image light through the second major surface; and an optical assembly (120, 120') is arranged adjacent to the light incidence surface of the light guide plate, the optical assembly (120, 120') being configured to homogenize and distribute the light emitted by each of the monochromatic light sources (112A, 112B, 112C, 162A, 162B, 162C) across the light incidence surface, the optical assembly (120, 120') including an optical integrator rod (130, 164) having an interior delimited by a plurality of reflective sidewalls, and a light guide member (132, 132') arranged along the light incidence surface of the light guide plate, the light guide member (132, 132') having a third and a fourth major surface (146, 148) opposite to each other that extend between a first and a second end (132A, 132B) of the light guide member (132, 132'), the third major surface being oriented toward the light incidence surface of the light guide plate; wherein the light from each of the monochromatic light sources (112A, 112B, 112C, 162A, 162B, 162C) undergoes internal reflection while propagating through the optical integrator rod (130, 164), enters the light guide member (132, 132') via a light entering surface on the first end of the light guide member (132, 132') and exits the light guide member (132, 132') through the third major surface thereof. the light guide plate is configured to direct light received at the light incidence surface through the first major surface toward the light modulator for modulation, and to receive an image light outputted from the light modulator at the first major surface and transmit the image light through the second major surface; and an optical assembly (120, 120') is arranged adjacent to the light incidence surface of the light guide plate, the optical assembly (120, 120') being configured to homogenize and distribute the light emitted by each of the monochromatic light sources (112A, 112B, 112C, 162A, 162B, 162C) across the light incidence surface, the optical assembly (120, 120') including an optical integrator rod (130, 164) having an interior delimited by a plurality of reflective sidewalls, and a light guide member (132, 132') arranged along the light incidence surface of the light guide plate, the light guide member (132, 132') having a third and a fourth major surface (146, 148) opposite to each other that extend between a first and a second end (132A, 132B) of the light guide member (132, 132'), the third major surface being oriented toward the light incidence surface of the light guide plate; wherein the light from each of the monochromatic light sources (112A, 112B, 112C, 162A, 162B, 162C) undergoes internal reflection while propagating through the optical integrator rod (130, 164), enters the light guide member (132, 132') via a light entering surface on the first end of the light guide member (132, 132') and exits the light guide member (132, 132') through the third major surface thereof.