The invention provides a handwriting screen assembly and a display device and belongs to the technical field of electronic handwriting devices, which can at least partially solve the problems that multi-point simultaneous writing is difficult for the present handwriting screens and the screens are not flexible. The handwriting screen assembly comprises: a writing unit which is used for sending out light having the first wavelength invisible to the naked eyes; a screen unit which comprises multiple pixels and each pixel comprises a first electrode, a second electrode, electrochromic material which is installed between the first electrode and the second electrode and a control circuit which is connected with the first electrode; at least one of the first electrode and the second electrode is transparent; the control circuit comprises a power supply terminal, a photosensitive switch and a first luminescent device, wherein the photosensitive switch and the first luminescent device are connected between the power supply terminal and the first electrode in a series mode; the photosensitive switch is used for switching on when being irradiated by the first wavelength light; the first luminescent device is used for sending the first wavelength light to the photosensitive switch.