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The non-standard (Jordanian) quantum deformations of $so(2,2)$ and (2+1)Poincar\'e algebras are constructed by starting from a quantum $sl(2,\R)$ basissuch that simple factorized expressions for their corresponding universal$R$-matrices are obtained. As an application, the null-plane quantum (2+1)Poincar\'e Poisson-Lie group is quantized by following the FRT prescription.Matrix and differential representations of this null-plane deformation arepresented, and the influence of the choice of the basis in the resultant$q$-Schr\"odinger equation governing the deformed null plane evolution iscommented.Comment: 11 pages, LaTe

(2+1) NULL-PLANE QUANTUM POINCARÉ GROUP FROM A FACTORIZED UNIVERSAL R-MATRIX