Patent ID: 8454184

Claim:
A back lighting unit, comprising: a light emitter comprising a light emitting diode; a light transmitting plate disposed over the light emitting diode, the light transmitting plate having a first surface facing the light emitting diode and a second surface opposite the first surface; and a phosphor film structure comprising a particulate phosphor, wherein the phosphor film structure is disposed on at least one of the first surface and the second surface of the light transmitting plate, wherein the phosphor film structure comprises at least two different color phosphor films disposed one above the other, wherein the light emitting diode is a blue light emitting diode, and the phosphor film structure comprises a green phosphor film and a red phosphor film, wherein the red phosphor film is disposed between the blue light emitting diode and the green phosphor film, and wherein the red phosphor film comprises at least one opening that exposes at least a portion of the green phosphor film to the blue light emitting diode.