The invention relates to the technical field of vehicle surface light sources, in particular to a surface light-emitting module for a vehicle. A surface light-emitting module used for a vehicle comprises a shell, a PCBA board integrated with an LED, a flat
light guide body, a reflecting layer and an
optical film layer, the PCBA board integrated with the LED, the flat
light guide body, the reflecting layer and the
optical film layer are installed in the shell, the PCBA board integrated with the LED is horizontally arranged on the inner bottom face of the shell, the flat
light guide body is vertically arranged above the PCBA board, the bottom of the
narrow face of the flat light guide body is provided with a
collimator used for being coupled into LED light, and the opposite flat face serves as a
light transmission channel. A micro-structure array is arranged on the inclined surface, facing the reflecting layer, of the flat light guide body, and the height of the micro-structure array is in exponential distribution along the
light propagation direction; the reflecting layer and the
optical film layer are located on the rear side and the front side of the flat light guide body respectively. The PCBA board, the flat light guide body, the reflecting layer and the optical film layer form a layer type compact structure, all the components are attached in a
face shape to achieve flat installation, light emitting uniformity is improved, and bright and dark stripes are eliminated. And the light
utilization rate is improved by utilizing the rear side reflecting layer and a multi-reflection mechanism.