The invention belongs to the display technical field and particularly relates to a light path adjustment unit and a display device. The light path adjustment unit is used for adjusting different directions of incident light to be emergent in the same direction and comprises a concentration portion, a reflection portion and a diffusion portion; the concentration portion and the diffusion portion are closed to form a hollow space; the reflection portion is arranged inside the hollow space and is opposite to and is connected with the concentration portion and the diffusion portion; the concentration portion is used for collecting the light which is incident to the light path adjustment unit from the different directions; the reflection portion is used for reflecting the light collected by the concentration portion to the diffusion portion; the diffusion portion is used for enabling the light which is reflected by the reflection portion to be emergent along the direction which is parallel to the facing direction. According to the light path adjustment unit, the different directions of incident light can be adjusted to be emergent in the same direction. A display panel of the display device with the light path adjustment unit is good in splicing effect, free of display image fault and good in visual effect.