Natural Landscape-Friendly Animation Display Technique Using Shape-Changing Artificial Grass System

This paper introduces a display technique to show gradation animation using a shape-changing artificial grass system. Recently, liquid crystal displays (LCDs) and projectors have been used in a natural public facility such as a park. However, these displays sometimes spoil natural scenery because they look like artificial materials. Our proposed method is useful to develop a natural landscape-friendly display. We develop a grass pixel system to display the gradation. The grass pixel consists of yellow and green grass, and the length of the green grass moves vertically. The grass pixel uses a pin-based shape-changing system using a stepper motor to control the grass length dynamically. We evaluated the gradation of the grass pixel through an image processing of HSV (Hue, Saturation, Value of Brightness) values. In the measurement, the pixel system moved the grass length from minimum to maximum, and we took images of the running grass pixel from several angles. As a result, we observed that the HSV values changed linearly with the movement of the length of the green grass. We also developed a 3 × 3 pixels grass display, which can show several gradation animations as demonstrations.