描述一种经热成型之多层反射偏光器，其系相对于行进穿过该经热成型之多层反射偏光器之一顶点的一光轴实质上旋转对称且沿着正交于该光轴之正交的第一轴及第二轴凸出。该经热成型之多层反射偏光器具有的至少一个第一位置距该光轴具有一径向距离r1及距在该顶点处垂直于该光轴的平面具有一位移s1，其中s1/r1系至少0.2。该经热成型之多层反射偏光器可具有至少一内层，其在远离该顶点之至少一个第一位置处系实质上光学单轴。对于该反射偏光器之由s1及r1所界定之一面积，该反射偏光器之一透射轴之最大变异可小于约2度。

A thermoformed multilayer reflective polarizer substantially rotationally symmetric about an optical axis passing thorough an apex of the thermoformed multilayer reflective polarizer and convex along orthogonal first and second axes orthogonal to the optical axis is described. The thermoformed multilayer reflective polarizer has at least one first location having a radial distance r1 from the optical axis and a displacement s1 from a plane perpendicular to the optical axis at the apex, where s1/r1 is at least 0.2. The thermoformed multilayer reflective polarizer may have at least one inner layer substantially optically uniaxial at least one first location away from the apex. For an area of the reflective polarizer defined by s1 and r1, a maximum variation of a transmission axis of the reflective polarizer may be less than about 2 degrees.