New pyridine-based compounds of Formula I, compositions, and methods of inhibiting the activity of glycogen synthase kinase in vitro and of treatment of GSK3-mediated disorders in vivo are provided. Furthermore, the invention concerns a contact grilling or roasting device having such a centre arm. The light emitting layer 6 includes a first light emitting layer 61 that at least emits light of a first color and a second light emitting layer 62 that emits light of a second color that is different from the first color in each pixel 10.