I've had a vague idea for some a new type of video display for a while now. it consists of a thin liquid layer, sort of like liquid crystal i guess, with an array of controllable heating elements behind it. A video signal would be translated into a matrix of temperature levels for these elements, which would change the color of the liquid in front of it. The main advantage of this over the current digital video displays, is that the picture would be continuous, rather than discrete. Even though the signal would still be discrete, the colors of the "pixels" would blend into the adjacent "pixel". this would most certainly require very complex algorithms to determine the color; the color response might not be linearly dependent of temp, the response time of the color change might be too slow for a fluid picture, etc. So i guess my main question would be wether or not such a material exitsts, or if there is something similar already in use.