A method for testing photosensitivity of an electronic display module, such as a liquid crystal display module, is provided. In one embodiment, a method includes exposing a display module to light at a first intensity and measuring an amount of light transmitted through the display module. The method may also include exposing the display module to light at a second intensity and measuring an amount of that light transmitted through the display module. The measured amounts may then be compared to determine an optical property, such as photosensitivity, of the display panel. Various other methods, systems, and manufactures are also disclosed.