Projection device

Abstract

A projection device comprises a light source module and a light guide piece. The light source module comprises an excitation light source, a light transmitting disk and a beam splitting system. The excitation light source is used for emitting an excitation light beam. The light transmitting disk is used for receiving excitation light beam and comprises a colored light generating area and a color wheel area. Multiple quantum dots are distributed in the colored light generating area and are used for receiving a part of the excitation light beam so as to generate an excited light beam. The color wheel area is located in the light transmitting disk and comprises multiple light filtering areas so as to generate a plurality of colored light rays. The beam splitting system is used for guiding the excited light beam to the color wheel area. The light guiding piece is used for receiving the multiple colored light rays and transmitting the multiple colored light rays so that the multiple colored light rays can be away from the light source module.

Description

technical field [0001] The invention relates to a projection device, in particular to a projection device which utilizes quantum dots to generate received light. Background technique [0002] Whether it is a projection device or a liquid crystal screen, how to obtain a primary color light source with color purity is a very important part. However, in the past, after using colored light-emitting diodes and phosphors to emit white light, and then using filters to obtain the luminescence of each primary color light Mode, such as using blue light-emitting diodes and yellow phosphors to emit white light, may cause poor image quality due to poor conversion efficiency and color rendering of phosphors. Even with multi-color light-emitting diodes, it is not easy to obtain primary color light with high color saturation, so the displayed image may have insufficient contrast or not bright enough. [0003] Quantum dots (quantum dots, QD) are semiconductor nanoparticles. When the quantum...

AI Technical Summary

Problems solved by technology

[0002] Whether it is a projection device or a liquid crystal screen, how to obtain a primary color light source with color purity is a very important part. However, in the past, after using colored light-emitting diodes and phosphors to emit white light, and then using filters to obtain the luminescence of each primary color light Mode, such as using blue light-emitting diodes with yellow phosphors to emit white light, may cause poor image quality due to poor conversion efficiency and color rendering of phosphors

Even with multi-color light-emitting diodes, it is not easy to obtain primary color light with high color saturation, so the displayed image may also have insufficient contrast or not bright enough.

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