Wavelength conversion module, forming method of wavelength conversion module, and projection device

A forming method of a wavelength conversion module, comprising:

• providing a substrate, wherein the substrate comprises an axis, and the axis is located at a center of the substrate;
• forming two first wavelength conversion layers on the substrate, wherein each of the first wavelength conversion layers comprises a wavelength conversion material and a first bonding material, and the wavelength conversion material is dispersed in the first bonding material;
• and
• forming a second wavelength conversion layer on the substrate, wherein the second wavelength conversion layer is located between the two first wavelength conversion layers in a radial direction from the axis of the substrate to an edge of the substrate, the second wavelength conversion layer comprises the wavelength conversion material and a second bonding material, the wavelength conversion material is dispersed in the second bonding material, and the first bonding material of the two first wavelength conversion layers is different from the second bonding material of the second wavelength conversion layer.

A projection device, comprising a wavelength conversion module, an excitation light source, a light valve, and a projection lens, wherein:

• the wavelength conversion module comprises a substrate and a wavelength conversion layer, wherein:
• the substrate comprises an axis, and the axis is located at a center of the substrate;
• and
• the wavelength conversion layer is located on the substrate and comprises:
• two first wavelength conversion layers, wherein the two first wavelength conversion layers comprise a wavelength conversion material and a first bonding material, and the wavelength conversion material is dispersed in the first bonding material;
• and
• a second wavelength conversion layer, wherein the second wavelength conversion layer is located between the two first wavelength conversion layers in a radial direction from the axis of the substrate to an edge of the substrate, the second wavelength conversion layer comprises the wavelength conversion material and a second bonding material, the wavelength conversion material is dispersed in the second bonding material, and the first bonding material of the two first wavelength conversion layers is different from the second bonding material of the second wavelength conversion layer;
• the excitation light source is adapted to emit an excitation beam, wherein the excitation beam is transmitted to the wavelength conversion module and forms an illumination beam through the wavelength conversion module;
• the light valve is located on a transmission path of the illumination beam and is adapted to convert the illumination beam into an image beam;
• and
• the projection lens is located on a transmission path of the image beam and is adapted to convert the image beam into a projection beam.