The invention discloses a
fingerprint recognition module. The
fingerprint recognition module comprises an LCD (
liquid crystal display) module and a
fingerprint recognition device to recognize a biological fingerprint optical
signal, wherein the LCD module comprises an LCD screen and a backlight module; the backlight module comprises a
light source, a
light guide plate arranged at one side of the
light source, a reflection sheet arranged below the
light guide plate, a
diffusion sheet arranged above the
light guide plate and a prismatic lens arranged above the
diffusion sheet; and the reflectionsheet is an
optical thin film of a multilayer structure and comprises a first surface, a second surface and a stack of N positive
refractive index micro-
layers, wherein the first surface and the second surface are arranged in parallel, the second surface is arranged opposite to the first surface, the refractive indexes of N-1 positive
refractive index micro-
layers from the first surface to the second surface are sequentially and progressively decreased, the
refractive index of the Nth positive refractive index micro-layer is greater than the refractive index of the (N-1)th positive refractiveindex micro-layer, and at least one negative refractive index micro-layer is arranged between the N positive refractive index micro-
layers from the first surface to the second surface.