An illumination light source, wherein the illumination light source comprises: a base substrate; an anode layer on the base substrate; and a field emission illumination module comprising: a carbon nanotubes layer on the base substrate; and a fluorescent powder layer on a side of the carbon nanotubes layer distal to the base substrate; wherein the anode layer is on a side of the fluorescent powder layer distal to the carbon nanotubes layer; characterized in that the illumination light source further comprises a light emitting diode illumination module; the light emitting diode illumination module comprising: a cathode layer between the base substrate and the anode layer; and a light emitting layer between the base substrate and the anode layer, the light emitting layer being on a side of the cathode layer distal to the base substrate; wherein the field emission illumination module and the light emitting diode illumination module being disposed horizontally in parallel with each other on the base substrate; wherein the light emitting layer of the light emitting diode illumination module is a blue light emitting layer; and the field emission illumination module is a yellow light emitting field emission illumination module; wherein the fluorescent powder layer comprises fluorescent powders of yellow color so that light emitted from the illumination light source is of substantially white color; wherein the cathode layer is configured to extend to a region between the base substrate and the carbon nanotubes layer. a base substrate; an anode layer on the base substrate; and a field emission illumination module comprising: a carbon nanotubes layer on the base substrate; and a fluorescent powder layer on a side of the carbon nanotubes layer distal to the base substrate; wherein the anode layer is on a side of the fluorescent powder layer distal to the carbon nanotubes layer; a carbon nanotubes layer on the base substrate; and a fluorescent powder layer on a side of the carbon nanotubes layer distal to the base substrate; wherein the anode layer is on a side of the fluorescent powder layer distal to the carbon nanotubes layer; characterized in that the illumination light source further comprises a light emitting diode illumination module; the light emitting diode illumination module comprising: a cathode layer between the base substrate and the anode layer; and a light emitting layer between the base substrate and the anode layer, the light emitting layer being on a side of the cathode layer distal to the base substrate; wherein the field emission illumination module and the light emitting diode illumination module being disposed horizontally in parallel with each other on the base substrate; wherein the light emitting layer of the light emitting diode illumination module is a blue light emitting layer; and the field emission illumination module is a yellow light emitting field emission illumination module; wherein the fluorescent powder layer comprises fluorescent powders of yellow color so that light emitted from the illumination light source is of substantially white color; wherein the cathode layer is configured to extend to a region between the base substrate and the carbon nanotubes layer. a cathode layer between the base substrate and the anode layer; and a light emitting layer between the base substrate and the anode layer, the light emitting layer being on a side of the cathode layer distal to the base substrate; wherein the field emission illumination module and the light emitting diode illumination module being disposed horizontally in parallel with each other on the base substrate; wherein the light emitting layer of the light emitting diode illumination module is a blue light emitting layer; and the field emission illumination module is a yellow light emitting field emission illumination module; wherein the fluorescent powder layer comprises fluorescent powders of yellow color so that light emitted from the illumination light source is of substantially white color; wherein the cathode layer is configured to extend to a region between the base substrate and the carbon nanotubes layer.