The invention discloses a display panel, a producing method of the display panel as well as a display device, relates to the technical field of display, and aims to solve the problem of the poorer display effect of display devices due to inconsistency of brightness of light emitted by transmission regions and reflection regions respectively. The display panel comprises multiple sub-pixel units distributed in an arrayed manner, wherein each sub-pixel unit comprises a reflection region and a transmission region, and an electrochromic layer is arranged in the transmission region. Values of voltage loaded on the electrochromic layers are adjusted, so that optical properties of the electrochromic layers are adjusted, then the transmittance of backlight in the transmission regions is adjusted, the brightness of light formed after the backlight passes through the transmission regions is identical with that of light formed after external light is reflected in the reflection regions and then transmitted, and then the display effect of the display device is improved. The display panel is applied to the display device.