1. An image forming system comprising: display surface means, a light source disposed in spaced apart relationship with said display surface means, light control means disposed in the light path to control light rays from said light source in such a manner as to cause the light rays to be transmitted with a uniform distribution of luminous flux density throughout the cross section of the light rays to said display surface means, and image generation means interposed between said light control means and said display surface means and having elemental portions for varying the quantity of light to be transmitted therethrough, said elemental portions corresponding to respective picture elements of an image to be formed on the display surface means, each elemental portion controlling the quantity of light to be transmitted independently of each other in response to a signal.