A method of operating an autostereoscopic display apparatus or a light field display apparatus comprising a scanning slit time multiplexed system using a time multiplexed 2D display, wherein the method comprises: showing at least two different representations of three dimensional information to at least two different viewer positions; and providing a different display property to each of the different viewer positions, wherein the display property is colour bit depth, and wherein providing a different colour bit depth to each of the different viewer positions comprises: providing a first colour bit depth to a first viewer position and a second colour bit depth to a second viewer position, the first colour bit depth being defined by opening a slit of the scanning slit time multiplexed system, the slit having a first width, and presenting on the 2D display the least significant bit of a first representation of the three dimensional information, and the second colour bit depth being defined by opening a slit of the scanning slit time multiplexed system, the slit having a second width, and presenting on the 2D display all other bits of a second representation of the three dimensional information, wherein the first width is narrower than the second width. showing at least two different representations of three dimensional information to at least two different viewer positions; and providing a different display property to each of the different viewer positions, wherein the display property is colour bit depth, and wherein providing a different colour bit depth to each of the different viewer positions comprises: providing a first colour bit depth to a first viewer position and a second colour bit depth to a second viewer position, the first colour bit depth being defined by opening a slit of the scanning slit time multiplexed system, the slit having a first width, and presenting on the 2D display the least significant bit of a first representation of the three dimensional information, and the second colour bit depth being defined by opening a slit of the scanning slit time multiplexed system, the slit having a second width, and presenting on the 2D display all other bits of a second representation of the three dimensional information, wherein the first width is narrower than the second width. wherein the display property is colour bit depth, and wherein providing a different colour bit depth to each of the different viewer positions comprises: providing a first colour bit depth to a first viewer position and a second colour bit depth to a second viewer position, the first colour bit depth being defined by opening a slit of the scanning slit time multiplexed system, the slit having a first width, and presenting on the 2D display the least significant bit of a first representation of the three dimensional information, and the second colour bit depth being defined by opening a slit of the scanning slit time multiplexed system, the slit having a second width, and presenting on the 2D display all other bits of a second representation of the three dimensional information, wherein the first width is narrower than the second width. providing a first colour bit depth to a first viewer position and a second colour bit depth to a second viewer position, the first colour bit depth being defined by opening a slit of the scanning slit time multiplexed system, the slit having a first width, and presenting on the 2D display the least significant bit of a first representation of the three dimensional information, and the second colour bit depth being defined by opening a slit of the scanning slit time multiplexed system, the slit having a second width, and presenting on the 2D display all other bits of a second representation of the three dimensional information, wherein the first width is narrower than the second width.