If you are working with LightWorks, you'll need the fantastic "LightWorks in Archicad" book available from me directly.
The answer to your specific question is:
1: Create the image as a material.
2: Make the material have "Constant" reflectance.
3: Adjust the image in Photoshop to be lighter - simulating overexposure.
Study the "Align 3D texture" command to precisely position your image on a panel.
Dwight Atkinson