Light Diffusion Plate and Method for Manufacturing the Same

A light diffusion plate, capable of being assembled with a blue light source module and converting blue light into white light;

• said light diffusion plate comprising:
• a plastic substrate, having a light-input surface and a light-output surface which are parallel to each other, and a thickness perpendicular to the light-input surface and the light-output surface;
• the light-input surface being configured to be located adjacent to the blue light source module, so that the blue light emitted by the blue light source module can get into the plastic substrate through the light-input surface and travel approximately along a direction of the thickness;
• at least one light-color conversion material, dispersed in the plastic substrate and capable of converting the blue light entering the plastic substrate into white light which is then emitted from the light-output surface;
• and
• a plurality of micro-bubbles, dispersed in the plastic substrate and capable of performing at least one of the following functions on the light in the plastic substrate:
• reflection, refraction or scattering, in order to improve a uniform light-emitting effect of the white light emitted from the light-output surface;
• wherein:
• the wavelength of the blue light is between 430-500 nm;
• the at least one light color conversion material at least comprises an organic dye;
• the plurality of micro-bubbles is formed in the plastic substrate by a foaming extrusion process of the light diffusion plate;
• an addition ratio (weight percentage) of the organic dye is between 0.0001%-5%;
• a weight-reduction ratio of the plurality of micro-bubbles to the plastic substrate is between 10-35%;
• an average size of the micro-bubbles is between 60-800 μm.