Structured light projection module for projecting unrelated patterns

A structured light projection module for projecting light patterns, comprising:

• a light source array, formed by a plurality of sub-light sources arranged in a two-dimensional pattern, and emitting a two-dimensional pattern beam corresponding to the two-dimensional pattern;
• and
• a diffractive optical element, configured to receive the two-dimensional pattern beam and diffract a structured light pattern beam outwardly to form a structured light pattern,
• wherein the structured light pattern is formed by a combined arrangement of a plurality of two-dimensional patterns, the plurality of two-dimensional patterns are periodically arranged along a first direction and a second direction, wherein the first direction and the second direction are not perpendicular to each other, wherein an angle α is formed between the first direction and the second direction, wherein α satisfies:
• 80° ≤α≤89°.

A depth camera, comprising:

• a projection module, configured to project a structured light pattern beam to a target region;
• and
• an acquisition module, disposed at a certain distance from the projection module and forming a baseline with the projection module, and configured to acquire a structured light pattern in the target region;
• wherein the structured light pattern is formed by a combined arrangement of a plurality of two-dimensional patterns, the plurality of two-dimensional patterns are periodically arranged in a first direction and a second direction, and the first direction and the second direction are not perpendicular to each other, wherein an angle α is formed between the first direction and the second direction, wherein α satisfies:
• 80° ≤α≤89°.