The invention provides a pixel unit, a pixel array, and a display panel. The pixel unit includes a first sub-pixel unit, a second sub-pixel unit, and a third sub-pixel unit, and the sub-pixel units share one data line. In the pixel unit of the present invention, which utilizes a plurality of sub-pixel units in the pixel unit sharing the same data line and simultaneously gate lines of a plurality of sub-pixel units arranging in parallel in the pixel unit, therefore, to save a wiring area, and an aperture ratio of the pixel unit is increased. Thereby increasing the light transmittance of the display panel and improving the display effect of the product.