LED light module for backlighting

摘要

An LED light module and a backlit sign using at least one of the LED light modules are described. The LED light module comprises at least two LED light sources that are spaced apart from each other. Each of the LED light sources is covered by a lens and at least two of the lenses have a different shape than each other. The LED light module produces a uniform intensity of light on a backlit surface. The LED light module can include three LED light sources. Two of the lenses covering the LED light sources emit light that is distributed off-axis and a third of the lenses covering the LED light sources emits light that is distributed substantially on-axis. The backlit sign comprises a housing, at least one LED light module disposed in the housing and a backlit surface on the housing extending over the LED modules.

主权项

1. An LED light module comprising at least two LED light sources that are spaced apart from each other, each of said LED light sources being covered by a lens, wherein at least two of said lenses have a different shape than each other in a form of different internal cross-sectional profiles or similar said profiles with different light distribution patterns, wherein one of said lenses covers a first one of said LED light sources such that emitted light is distributed off-axis and one of said lenses covers a second one of said LED light sources such that emitted light is distributed substantially on-axis, and wherein a ratio of the off-axis illumination intensity to the on-axis illumination intensity is at least 2 to 1.