Surface light source module and display device

A display device, comprising a display element and at least one surface light source module, wherein:

• the display element is disposed on one side of the at least one surface light source module, and each at least one surface light source module comprises a light guide plate and a light source element, wherein:
• the light guide plate has a first surface and a second surface that are opposite to each other, and a light incident surface connecting the first surface and the second surface, the second surface is close to the display element, and the first surface is provided with a plurality of microstructures;
• and
• the light source element is disposed opposite to the light incident surface,
• wherein each of the plurality of microstructures has a first structural surface connecting the first surface, each of the plurality of microstructures has a symmetry plane, the symmetry plane is perpendicular to the first surface, a boundary between the first structural surface and the symmetry plane has a first intersection line, the first intersection line comprises a first line segment part, and the first line segment part has a first end and a second end that are opposite to each other,
• there is a first height between the first end and the first surface, there is a second height between the second end and the first surface, each of the plurality of microstructures has a maximum depth, and an absolute value of a difference between the first height and the second height is greater than or equal to one-third of the maximum depth,
• and a distance between each position point of the first line segment part and a corresponding position point of a part of a contour of a geometric shape in a first direction is less than or equal to one-fifth of a half-axis length of a first axis of the geometric shape, wherein the first direction is perpendicular to the first surface, and the geometric shape conforms to:
• x
• 2
• b
• 2
• +
• y
• 2
• a
• 2
• =
• 1
• ,
• wherein −a≤y≤a, −b≤x≤b, a ratio of a to b is between 0.1 and 2, a is the half-axis length of the first axis, and b is a half-axis length of a second axis of the geometric shape.