A light guide plate, LGP, comprising: a first light guide segment and a second light guide segment alternately arranged in a first direction, the first light guide segment being configured to guide light incident from a first light source, and the second light guide segment being configured to guide light incident from a second light source; wherein the second light guide segment is configured to output the light incident from the second light source as output light with a square dot pattern along a second direction along the length of the second light guide segment, wherein the light guide plate further comprises a diffuser configured to change the output light corresponding to the first light guide segment to planar light for generating a two-dimensional image, and change the square dot pattern output light corresponding to the second light guide segment to light extending in the first direction, the light guide plate being characterised in that the diffuser is configured to change the square dot pattern output light corresponding to the second light guide segment to light with a stripe pattern for generating a three-dimensional image, the stripes extending in the first direction. a first light guide segment and a second light guide segment alternately arranged in a first direction, the first light guide segment being configured to guide light incident from a first light source, and the second light guide segment being configured to guide light incident from a second light source; wherein the second light guide segment is configured to output the light incident from the second light source as output light with a square dot pattern along a second direction along the length of the second light guide segment, wherein the light guide plate further comprises a diffuser configured to change the output light corresponding to the first light guide segment to planar light for generating a two-dimensional image, and change the square dot pattern output light corresponding to the second light guide segment to light extending in the first direction, the light guide plate being characterised in that the diffuser is configured to change the square dot pattern output light corresponding to the second light guide segment to light with a stripe pattern for generating a three-dimensional image, the stripes extending in the first direction. the first light guide segment being configured to guide light incident from a first light source, and the second light guide segment being configured to guide light incident from a second light source; wherein the second light guide segment is configured to output the light incident from the second light source as output light with a square dot pattern along a second direction along the length of the second light guide segment, wherein the light guide plate further comprises a diffuser configured to change the output light corresponding to the first light guide segment to planar light for generating a two-dimensional image, and change the square dot pattern output light corresponding to the second light guide segment to light extending in the first direction, the light guide plate being characterised in that the diffuser is configured to change the square dot pattern output light corresponding to the second light guide segment to light with a stripe pattern for generating a three-dimensional image, the stripes extending in the first direction.