Abstract: A projection device with dynamic light effect is provided, which includes at least one LED light source, a condensing lens, at least one external projection mono-convex lens, and further includes at least one filter. The filter is located between the condensing lens and the external projection mono-convex lens, an out-light surface of the condensing lens is provided with a first ripple. An upper and/or a lower surface of the filter are provided with a second ripple; being refracted by an interference pattern on the first ripple through the condensing lens, emitted light corresponding to the interference pattern on the first ripple is formed. Then, the light passes through the filter and undergoes two refractions. The light is refracted by the interference pattern on the second ripple, resulting in a refraction effect of the interference pattern superimposed on the first ripple and second ripple.

Abstract: A projection device with dynamic light effect is provided, which includes at least one LED light source, a condensing lens, at least one external projection mono-convex lens, and further includes at least one filter. The filter is located between the condensing lens and the external projection mono-convex lens, an out-light surface of the condensing lens is provided with a first ripple. An upper and/or a lower surface of the filter are provided with a second ripple; being refracted by an interference pattern on the first ripple through the condensing lens, emitted light corresponding to the interference pattern on the first ripple is formed. Then, the light passes through the filter and undergoes two refractions. The light is refracted by the interference pattern on the second ripple, resulting in a refraction effect of the interference pattern superimposed on the first ripple and second ripple.