A backlight, comprising: a bar collimator and a backlight light guide, the bar collimator comprising: a light guide configured to guide light along a length of the light guide as guided light; a light extraction feature comprising a prismatic layer affixed to a side of the light guide along the light guide length, the light extraction feature being configured to scatter a portion of the guided light out of the light guide as extracted light and to direct the extracted light toward an input of the backlight light guide; and a collimation film between the light guide and the backlight input, the collimation film being configured to collimate the extracted light as collimated light, wherein the collimated light has an extent corresponding to a length of the backlight input and is configured to serve as an illumination source of the backlight light guide, the backlight light guide being configured to receive the collimated light from the bar collimator at the input of the backlight light guide and to guide the received collimated light as guided collimated light, characterised in that the bar collimator comprises a light-coupling reflector layer adjacent to each of a top surface and a bottom surface of the light guide and wherein each of the light-coupling reflector layers extend from the bar collimator and over guiding surfaces of the backlight light guide. a bar collimator and a backlight light guide, the bar collimator comprising: a light guide configured to guide light along a length of the light guide as guided light; a light extraction feature comprising a prismatic layer affixed to a side of the light guide along the light guide length, the light extraction feature being configured to scatter a portion of the guided light out of the light guide as extracted light and to direct the extracted light toward an input of the backlight light guide; and a collimation film between the light guide and the backlight input, the collimation film being configured to collimate the extracted light as collimated light, wherein the collimated light has an extent corresponding to a length of the backlight input and is configured to serve as an illumination source of the backlight light guide, the backlight light guide being configured to receive the collimated light from the bar collimator at the input of the backlight light guide and to guide the received collimated light as guided collimated light, characterised in that the bar collimator comprises a light-coupling reflector layer adjacent to each of a top surface and a bottom surface of the light guide and wherein each of the light-coupling reflector layers extend from the bar collimator and over guiding surfaces of the backlight light guide. a light guide configured to guide light along a length of the light guide as guided light; a light extraction feature comprising a prismatic layer affixed to a side of the light guide along the light guide length, the light extraction feature being configured to scatter a portion of the guided light out of the light guide as extracted light and to direct the extracted light toward an input of the backlight light guide; and a collimation film between the light guide and the backlight input, the collimation film being configured to collimate the extracted light as collimated light, wherein the collimated light has an extent corresponding to a length of the backlight input and is configured to serve as an illumination source of the backlight light guide, the backlight light guide being configured to receive the collimated light from the bar collimator at the input of the backlight light guide and to guide the received collimated light as guided collimated light, characterised in that the bar collimator comprises a light-coupling reflector layer adjacent to each of a top surface and a bottom surface of the light guide and wherein each of the light-coupling reflector layers extend from the bar collimator and over guiding surfaces of the backlight light guide.