DUAL GRAPHIC DISPLAY

PROBLEM TO BE SOLVED: To provide a more convenient display unit for selectively displaying to a user, either individually or together, an image of a first graphic and an image of a second graphic.SOLUTION: The display unit comprises a polarizing filter assembly 2, a source of polarized illumination 3 for backlighting the assembly, and means 4 for activating the source to selectively provide a first polarization 5 to generate the first graphic image and a second polarization 6 to generate the second graphic image. The polarizing filter assembly 2 comprises a first display element 13 and a second display element 14, the display elements being joined to each other, the first display element has a first polarizing pattern and the second display element has a second polarizing pattern, and the first and second patterns generate, when illuminated respectively with the first polarization 5 and the second polarization 6, the first and second graphic images. On first and second substrate layers 16 and 17 of the first and second display elements 13 and 14, a transparent first polarizing layer 18 providing the first polarizing pattern and a transparent second polarizing layer 19 providing the second polarizing pattern, are provided respectively. The first display element 13 is joined to the second display element 14 along an interface 15 between the first polarizing layer 18 and the second polarizing layer 19 to form the polarizing filter assembly 2.