When LED screens want “showtime” in movie theaters, DCI certification is a must; that is, without a DCI certification, any large-format display cannot be installed in the qualified movie theaters. DCI certification is released by Digital Cinema Initiatives, LLC, a consortium of major motion picture studios dominating the cinema system standards. Unilumin’s LED screens, UC-A41 and UC-A21, have successfully passed the DCI certification and been installed in The China Film Cinema Bei'ao, Beijing (Fig.1), one of them is the world&rsquo...