A light patterning device, comprising: a light incidence portion located at a central position of the light patterning device at a first side thereof and configured to receive an incident light (10, 14); a first reflective wall adjoining the light incidence portion and extending towards a periphery of the light patterning device from the light incidence portion along the first side of the light patterning device, the first reflective wall having a first reflective area; a second reflective wall located at a second side opposed to the first side of the light patterning device and configured to be opposed to the light incidence portion and the first reflective wall, wherein the second reflective wall is provided with a light transmission area which is configured to at least partly transmit the light from the light incidence portion or the first reflective area out of the light patterning device so as to form a bright region and a second reflective area which is configured to at least partly reflect the light from the light incidence portion or the first reflective area towards the first reflective area of the first reflective wall so as to form a dark region, the first reflective area of the first reflective wall at least partly reflecting the light from the second reflective area of the second reflective wall towards the second reflective area and at least partly reflecting light from the second reflective area towards the transmission area so as to form a bright region; and characterized in that one part of the incident light is transmitted through a light transmission area at an outer periphery of the second reflective wall after being reflected by the first reflective area twice and the second reflective area twice respectively, and another part of the incident light is transmitted through another light transmission area of the second reflective wall after being reflected by the first reflective area once and the second reflective area once respectively. a light incidence portion located at a central position of the light patterning device at a first side thereof and configured to receive an incident light (10, 14); a first reflective wall adjoining the light incidence portion and extending towards a periphery of the light patterning device from the light incidence portion along the first side of the light patterning device, the first reflective wall having a first reflective area; a second reflective wall located at a second side opposed to the first side of the light patterning device and configured to be opposed to the light incidence portion and the first reflective wall, wherein the second reflective wall is provided with a light transmission area which is configured to at least partly transmit the light from the light incidence portion or the first reflective area out of the light patterning device so as to form a bright region and a second reflective area which is configured to at least partly reflect the light from the light incidence portion or the first reflective area towards the first reflective area of the first reflective wall so as to form a dark region, the first reflective area of the first reflective wall at least partly reflecting the light from the second reflective area of the second reflective wall towards the second reflective area and at least partly reflecting light from the second reflective area towards the transmission area so as to form a bright region; and characterized in that one part of the incident light is transmitted through a light transmission area at an outer periphery of the second reflective wall after being reflected by the first reflective area twice and the second reflective area twice respectively, and another part of the incident light is transmitted through another light transmission area of the second reflective wall after being reflected by the first reflective area once and the second reflective area once respectively.