Miniature light emitting diode display chip and preparation method thereof

The invention discloses a miniature light-emitting diode display chip and a preparation method, and the chip comprises a driving substrate which comprises a plurality of first contacts; the plurality of LED units are arranged on the driving substrate in an array; the first contacts are located between the adjacent LED units, and each LED unit is independently driven through the corresponding first contact; the LED unit comprises a light-emitting surface formed by etching the LED epitaxial layer and a light-emitting surface used for collimating light emitted by the active layer. According to the micro light emitting diode display chip provided by the embodiment of the invention, each LED unit is provided with the step structure, the step structure is provided with the arc-shaped light emitting surface, and the arc-shaped light emitting surface is used for collimating the light emitted by the active layer. The lens is formed through the arc-shaped light-emitting surface, so that the problem of light emission di