Wavelength conversion device, diffuse reflection layer, light source system and projection system

Abstract

The embodiment of the invention discloses a wavelength conversion device, a diffuse reflection layer, a light source system and a projection system. The wavelength conversion device comprises a fluorescent layer containing fluorescent powder for realizing wavelength conversion, as well as the diffuse reflection layer attached to the backlight surface of the fluorescent layer; the diffuse reflection layer comprises white scattering particles and a first binding element bound with the white scattering particles; the ratio of the refractive index of the white scattering particles to that of the first binding element is greater than 1.2. After the invention is adopted, a thinner diffuse reflection layer can achieve high reflectivity, and the thinner diffuse reflection layer is beneficial to shortening of a heat conduction path of a luminous layer, so that the heat stability of the wavelength conversion device is improved.

Description

technical field [0001] The invention relates to the technical field of illumination and display, in particular to a wavelength conversion device, a diffuse reflection layer, a light source system and a projection system. Background technique [0002] At present, the high-speed rotating color wheel excited by blue light laser can effectively solve the problem of thermal quenching of phosphors, making high-efficiency and low-cost laser display a reality, and gradually develops into one of the mainstream technologies of laser light sources. [0003] In this solution, the light source includes an excitation light source and a wavelength conversion device, wherein the wavelength conversion device includes a reflective substrate, a phosphor sheet coated on the reflective substrate, and a motor for driving the reflective substrate to rotate, so that the excitation from the excitation light source The light spots formed by the light on the phosphor sheet act on the phosphor sheet in...

AI Technical Summary

Problems solved by technology

[0005] The problem of this kind of mirror aluminum substrate is: for the highly reflective silver layer with higher reflectivity, during use, silver atoms are easy to sulfide and oxidize with hydrogen sulfide and oxygen in the atmosphere to reduce the reflectivity. and thermal stability are drastically reduced; for highly reflective aluminum layers, aluminum is more stable than silver, but the reflectivity is not high

[0006] Therefore, under the current process conditions, other more effective methods must be found in order to take into account the reflectivity and thermal stability of the aluminum substrate. A dense protective layer of aluminum or silicon nitride is used to solve the problem of silver sulfide. However, in order not to affect the reflectivity of the reflective layer, the thickness of the protective layer is generally below 10nm, the uniformity is difficult to guarantee, and the process is relatively complicated.

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